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1453 行
55 KiB
1453 行
55 KiB
using System.Collections.Generic;
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using Unity.UIWidgets.foundation;
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using Unity.UIWidgets.gestures;
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using Unity.UIWidgets.painting;
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using Unity.UIWidgets.service;
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using Unity.UIWidgets.ui;
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using UnityEngine;
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using Canvas = Unity.UIWidgets.ui.Canvas;
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using Color = Unity.UIWidgets.ui.Color;
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using Rect = Unity.UIWidgets.ui.Rect;
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namespace Unity.UIWidgets.rendering {
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public delegate void SelectionChangedHandler(TextSelection selection, RenderEditable renderObject,
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SelectionChangedCause cause);
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public delegate void CaretChangedHandler(Rect caretRect);
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public enum SelectionChangedCause {
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tap,
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doubleTap,
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longPress,
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forcePress,
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keyboard,
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drag
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}
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public class TextSelectionPoint {
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public readonly Offset point;
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public readonly TextDirection? direction;
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public TextSelectionPoint(Offset point, TextDirection? direction) {
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D.assert(point != null);
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this.point = point;
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this.direction = direction;
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}
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public override string ToString() {
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return $"Point: {this.point}, Direction: {this.direction}";
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}
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}
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public class RenderEditable : RenderBox {
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public static readonly char obscuringCharacter = '•';
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static readonly float _kCaretGap = 1.0f;
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static readonly float _kCaretHeightOffset = 2.0f;
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static readonly Offset _kFloatingCaretSizeIncrease = new Offset(0.5f, 1.0f);
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static readonly float _kFloatingCaretRadius = 1.0f;
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TextPainter _textPainter;
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Color _cursorColor;
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int? _maxLines;
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Color _selectionColor;
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ViewportOffset _offset;
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ValueNotifier<bool> _showCursor;
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TextSelection _selection;
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bool _obscureText;
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TapGestureRecognizer _tap;
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LongPressGestureRecognizer _longPress;
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DoubleTapGestureRecognizer _doubleTap;
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public bool ignorePointer;
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public SelectionChangedHandler onSelectionChanged;
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public CaretChangedHandler onCaretChanged;
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Rect _lastCaretRect;
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float? _textLayoutLastWidth;
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List<TextBox> _selectionRects;
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Rect _caretPrototype;
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bool _hasVisualOverflow = false;
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Offset _lastTapDownPosition;
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public RenderEditable(
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TextSpan text,
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TextDirection textDirection,
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ViewportOffset offset,
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ValueNotifier<bool> showCursor,
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TextAlign textAlign = TextAlign.left,
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float textScaleFactor = 1.0f,
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Color cursorColor = null,
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Color backgroundCursorColor = null,
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bool? hasFocus = null,
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int? maxLines = 1,
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Color selectionColor = null,
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TextSelection selection = null,
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bool obscureText = false,
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SelectionChangedHandler onSelectionChanged = null,
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CaretChangedHandler onCaretChanged = null,
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bool ignorePointer = false,
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float cursorWidth = 1.0f,
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Radius cursorRadius = null,
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bool? enableInteractiveSelection = null,
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bool paintCursorAboveText = false,
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Offset cursorOffset = null,
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float devicePixelRatio = 1.0f,
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EdgeInsets floatingCursorAddedMargin = null,
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TextSelectionDelegate textSelectionDelegate = null) {
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floatingCursorAddedMargin = floatingCursorAddedMargin ?? EdgeInsets.fromLTRB(4, 4, 4, 5);
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D.assert(textSelectionDelegate != null);
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this._textPainter = new TextPainter(text: text, textAlign: textAlign, textDirection: textDirection,
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textScaleFactor: textScaleFactor);
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this._cursorColor = cursorColor;
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this._showCursor = showCursor ?? new ValueNotifier<bool>(false);
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this._hasFocus = hasFocus ?? false;
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this._maxLines = maxLines;
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this._selectionColor = selectionColor;
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this._selection = selection;
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this._obscureText = obscureText;
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this._offset = offset;
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this._cursorWidth = cursorWidth;
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this._cursorRadius = cursorRadius;
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this._enableInteractiveSelection = enableInteractiveSelection;
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this.ignorePointer = ignorePointer;
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this.onCaretChanged = onCaretChanged;
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this.onSelectionChanged = onSelectionChanged;
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this.textSelectionDelegate = textSelectionDelegate;
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D.assert(this._maxLines == null || this._maxLines > 0);
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D.assert(this._showCursor != null);
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D.assert(!this._showCursor.value || cursorColor != null);
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this._tap = new TapGestureRecognizer(this);
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this._doubleTap = new DoubleTapGestureRecognizer(this);
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this._tap.onTapDown = this._handleTapDown;
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this._tap.onTap = this._handleTap;
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this._doubleTap.onDoubleTap = this._handleDoubleTap;
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this._longPress = new LongPressGestureRecognizer(debugOwner: this);
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this._longPress.onLongPress = this._handleLongPress;
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this._backgroundCursorColor = backgroundCursorColor;
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this._paintCursorOnTop = paintCursorAboveText;
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this._cursorOffset = cursorOffset;
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this._floatingCursorAddedMargin = floatingCursorAddedMargin;
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this._devicePixelRatio = devicePixelRatio;
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}
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public float devicePixelRatio {
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get { return this._devicePixelRatio; }
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set {
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if (this.devicePixelRatio == value) {
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return;
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}
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this._devicePixelRatio = value;
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this.markNeedsTextLayout();
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}
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}
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float _devicePixelRatio;
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public Color backgroundCursorColor {
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get { return this._backgroundCursorColor; }
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set {
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if (this.backgroundCursorColor == value) {
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return;
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}
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this._backgroundCursorColor = value;
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this.markNeedsPaint();
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}
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}
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Color _backgroundCursorColor;
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public bool paintCursorAboveText {
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get { return this._paintCursorOnTop; }
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set {
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if (this._paintCursorOnTop == value) {
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return;
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}
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this._paintCursorOnTop = value;
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this.markNeedsLayout();
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}
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}
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bool _paintCursorOnTop;
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public Offset cursorOffset {
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get { return this._cursorOffset; }
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set {
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if (this._cursorOffset == value) {
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return;
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}
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this._cursorOffset = value;
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this.markNeedsLayout();
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}
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}
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Offset _cursorOffset;
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public EdgeInsets floatingCursorAddedMargin {
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get { return this._floatingCursorAddedMargin; }
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set {
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if (this._floatingCursorAddedMargin == value) {
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return;
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}
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this._floatingCursorAddedMargin = value;
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this.markNeedsPaint();
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}
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}
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EdgeInsets _floatingCursorAddedMargin;
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bool _floatingCursorOn = false;
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Offset _floatingCursorOffset;
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TextPosition _floatingCursorTextPosition;
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public bool selectionEnabled {
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get { return this.enableInteractiveSelection ?? !this.obscureText; }
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}
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public bool obscureText {
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get { return this._obscureText; }
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set {
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if (this._obscureText == value) {
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return;
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}
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this._obscureText = value;
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this.markNeedsSemanticsUpdate();
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}
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}
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public TextSelectionDelegate textSelectionDelegate;
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int _extentOffset = -1;
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int _baseOffset = -1;
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int _previousCursorLocation;
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bool _resetCursor = false;
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void _handleKeyEvent(RawKeyEvent keyEvent) {
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if (keyEvent is RawKeyUpEvent) {
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return;
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}
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if (this.selection.isCollapsed) {
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this._extentOffset = this.selection.extentOffset;
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this._baseOffset = this.selection.baseOffset;
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}
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KeyCode pressedKeyCode = keyEvent.data.unityEvent.keyCode;
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int modifiers = (int) keyEvent.data.unityEvent.modifiers;
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bool shift = (modifiers & (int) EventModifiers.Shift) > 0;
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bool ctrl = (modifiers & (int) EventModifiers.Control) > 0;
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bool alt = (modifiers & (int) EventModifiers.Alt) > 0;
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bool cmd = (modifiers & (int) EventModifiers.Command) > 0;
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bool rightArrow = pressedKeyCode == KeyCode.RightArrow;
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bool leftArrow = pressedKeyCode == KeyCode.LeftArrow;
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bool upArrow = pressedKeyCode == KeyCode.UpArrow;
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bool downArrow = pressedKeyCode == KeyCode.DownArrow;
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bool arrow = leftArrow || rightArrow || upArrow || downArrow;
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bool aKey = pressedKeyCode == KeyCode.A;
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bool xKey = pressedKeyCode == KeyCode.X;
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bool vKey = pressedKeyCode == KeyCode.V;
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bool cKey = pressedKeyCode == KeyCode.C;
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bool del = pressedKeyCode == KeyCode.Delete;
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bool isMac = SystemInfo.operatingSystemFamily == OperatingSystemFamily.MacOSX;
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if (keyEvent is RawKeyCommandEvent) {
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// editor case
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this._handleShortcuts(((RawKeyCommandEvent) keyEvent).command);
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return;
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}
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if ((ctrl || (isMac && cmd)) && (xKey || vKey || cKey || aKey)) {
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// runtime case
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if (xKey) {
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this._handleShortcuts(KeyCommand.Cut);
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}
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else if (aKey) {
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this._handleShortcuts(KeyCommand.SelectAll);
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}
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else if (vKey) {
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this._handleShortcuts(KeyCommand.Paste);
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}
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else if (cKey) {
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this._handleShortcuts(KeyCommand.Copy);
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}
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return;
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}
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if (arrow) {
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int newOffset = this._extentOffset;
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var word = (isMac && alt) || ctrl;
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if (word) {
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newOffset = this._handleControl(rightArrow, leftArrow, word, newOffset);
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}
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newOffset = this._handleHorizontalArrows(rightArrow, leftArrow, shift, newOffset);
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if (downArrow || upArrow) {
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newOffset = this._handleVerticalArrows(upArrow, downArrow, shift, newOffset);
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}
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newOffset = this._handleShift(rightArrow, leftArrow, shift, newOffset);
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this._extentOffset = newOffset;
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}
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if (del) {
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this._handleDelete();
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}
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}
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int _handleControl(bool rightArrow, bool leftArrow, bool ctrl, int newOffset) {
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// If control is pressed, we will decide which way to look for a word
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// based on which arrow is pressed.
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if (leftArrow && this._extentOffset > 2) {
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TextSelection textSelection =
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this._selectWordAtOffset(new TextPosition(offset: this._extentOffset - 2));
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newOffset = textSelection.baseOffset + 1;
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}
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else if (rightArrow && this._extentOffset < this.text.text.Length - 2) {
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TextSelection textSelection =
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this._selectWordAtOffset(new TextPosition(offset: this._extentOffset + 1));
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newOffset = textSelection.extentOffset - 1;
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}
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return newOffset;
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}
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int _handleHorizontalArrows(bool rightArrow, bool leftArrow, bool shift, int newOffset) {
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if (rightArrow && this._extentOffset < this.text.text.Length) {
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if (newOffset < this.text.text.Length - 1 && char.IsHighSurrogate(this.text.text[newOffset])) {
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// handle emoji, which takes 2 bytes
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newOffset += 2;
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if (shift) {
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this._previousCursorLocation += 2;
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}
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}
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else {
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newOffset += 1;
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if (shift) {
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this._previousCursorLocation += 1;
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}
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}
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}
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if (leftArrow && this._extentOffset > 0) {
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if (newOffset > 1 && char.IsLowSurrogate(this.text.text[newOffset - 1])) {
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// handle emoji, which takes 2 bytes
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newOffset -= 2;
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if (shift) {
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this._previousCursorLocation -= 2;
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}
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}
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else {
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newOffset -= 1;
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if (shift) {
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this._previousCursorLocation -= 1;
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}
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}
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}
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return newOffset;
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}
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int _handleVerticalArrows(bool upArrow, bool downArrow, bool shift, int newOffset) {
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float plh = this._textPainter.preferredLineHeight;
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float verticalOffset = upArrow ? -0.5f * plh : 1.5f * plh;
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Offset caretOffset =
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this._textPainter.getOffsetForCaret(new TextPosition(offset: this._extentOffset), this._caretPrototype);
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Offset caretOffsetTranslated = caretOffset.translate(0.0f, verticalOffset);
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TextPosition position = this._textPainter.getPositionForOffset(caretOffsetTranslated);
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if (position.offset == this._extentOffset) {
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if (downArrow) {
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newOffset = this.text.text.Length;
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}
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else if (upArrow) {
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newOffset = 0;
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}
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this._resetCursor = shift;
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}
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else if (this._resetCursor && shift) {
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newOffset = this._previousCursorLocation;
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this._resetCursor = false;
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}
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else {
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newOffset = position.offset;
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this._previousCursorLocation = newOffset;
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}
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return newOffset;
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}
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int _handleShift(bool rightArrow, bool leftArrow, bool shift, int newOffset) {
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if (this.onSelectionChanged == null) {
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return newOffset;
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}
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if (shift) {
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if (this._baseOffset < newOffset) {
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this.onSelectionChanged(
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new TextSelection(
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baseOffset: this._baseOffset,
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extentOffset: newOffset
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),
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this,
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SelectionChangedCause.keyboard
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);
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}
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else {
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this.onSelectionChanged(
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new TextSelection(
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baseOffset: newOffset,
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extentOffset: this._baseOffset
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),
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this,
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SelectionChangedCause.keyboard
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);
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}
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}
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else {
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if (!this.selection.isCollapsed) {
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if (leftArrow) {
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newOffset = this._baseOffset < this._extentOffset ? this._baseOffset : this._extentOffset;
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}
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else if (rightArrow) {
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newOffset = this._baseOffset > this._extentOffset ? this._baseOffset : this._extentOffset;
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}
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}
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this.onSelectionChanged(
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TextSelection.fromPosition(
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new TextPosition(
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offset: newOffset
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)
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),
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this,
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SelectionChangedCause.keyboard
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);
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}
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return newOffset;
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}
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void _handleShortcuts(KeyCommand cmd) {
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switch (cmd) {
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case KeyCommand.Copy:
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if (!this.selection.isCollapsed) {
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Clipboard.setData(
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new ClipboardData(text: this.selection.textInside(this.text.text)));
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}
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break;
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case KeyCommand.Cut:
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if (!this.selection.isCollapsed) {
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Clipboard.setData(
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new ClipboardData(text: this.selection.textInside(this.text.text)));
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this.textSelectionDelegate.textEditingValue = new TextEditingValue(
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text: this.selection.textBefore(this.text.text)
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+ this.selection.textAfter(this.text.text),
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selection: TextSelection.collapsed(offset: this.selection.start)
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);
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}
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break;
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case KeyCommand.Paste:
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TextEditingValue value = this.textSelectionDelegate.textEditingValue;
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Clipboard.getData(Clipboard.kTextPlain).Then(data => {
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if (data != null) {
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this.textSelectionDelegate.textEditingValue = new TextEditingValue(
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text: value.selection.textBefore(value.text)
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+ data.text
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+ value.selection.textAfter(value.text),
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selection: TextSelection.collapsed(
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offset: value.selection.start + data.text.Length
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)
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);
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}
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});
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break;
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case KeyCommand.SelectAll:
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this._baseOffset = 0;
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this._extentOffset = this.textSelectionDelegate.textEditingValue.text.Length;
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this.onSelectionChanged(
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new TextSelection(
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baseOffset: 0,
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extentOffset: this.textSelectionDelegate.textEditingValue.text.Length
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),
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this,
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SelectionChangedCause.keyboard
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);
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break;
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default:
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D.assert(false);
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break;
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}
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}
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void _handleDelete() {
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var selection = this.selection;
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if (selection.textAfter(this.text.text).isNotEmpty()) {
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if (char.IsHighSurrogate(this.text.text[selection.end])) {
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this.textSelectionDelegate.textEditingValue = new TextEditingValue(
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text: selection.textBefore(this.text.text)
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+ selection.textAfter(this.text.text).Substring(2),
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selection: TextSelection.collapsed(offset: selection.start)
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);
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}
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else {
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this.textSelectionDelegate.textEditingValue = new TextEditingValue(
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text: selection.textBefore(this.text.text)
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+ selection.textAfter(this.text.text).Substring(1),
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selection: TextSelection.collapsed(offset: selection.start)
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);
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}
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}
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else {
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this.textSelectionDelegate.textEditingValue = new TextEditingValue(
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text: selection.textBefore(this.text.text),
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selection: TextSelection.collapsed(offset: selection.start)
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);
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}
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}
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protected void markNeedsTextLayout() {
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this._textLayoutLastWidth = null;
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this.markNeedsLayout();
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}
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public TextSpan text {
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get { return this._textPainter.text; }
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set {
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if (this._textPainter.text == value) {
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return;
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}
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this._textPainter.text = value;
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this.markNeedsTextLayout();
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this.markNeedsSemanticsUpdate();
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}
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}
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public TextAlign textAlign {
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get { return this._textPainter.textAlign; }
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set {
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if (this._textPainter.textAlign == value) {
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return;
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}
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this._textPainter.textAlign = value;
|
|
this.markNeedsPaint();
|
|
}
|
|
}
|
|
|
|
public TextDirection? textDirection {
|
|
get { return this._textPainter.textDirection; }
|
|
set {
|
|
if (this._textPainter.textDirection == value) {
|
|
return;
|
|
}
|
|
|
|
this._textPainter.textDirection = value;
|
|
this.markNeedsTextLayout();
|
|
this.markNeedsSemanticsUpdate();
|
|
}
|
|
}
|
|
|
|
public Color cursorColor {
|
|
get { return this._cursorColor; }
|
|
set {
|
|
if (this._cursorColor == value) {
|
|
return;
|
|
}
|
|
|
|
this._cursorColor = value;
|
|
this.markNeedsPaint();
|
|
}
|
|
}
|
|
|
|
public ValueNotifier<bool> showCursor {
|
|
get { return this._showCursor; }
|
|
set {
|
|
D.assert(value != null);
|
|
if (this._showCursor == value) {
|
|
return;
|
|
}
|
|
|
|
if (this.attached) {
|
|
this._showCursor.removeListener(this.markNeedsPaint);
|
|
}
|
|
|
|
this._showCursor = value;
|
|
if (this.attached) {
|
|
this._showCursor.addListener(this.markNeedsPaint);
|
|
}
|
|
|
|
this.markNeedsPaint();
|
|
}
|
|
}
|
|
|
|
bool _hasFocus;
|
|
bool _listenerAttached = false;
|
|
|
|
public bool hasFocus {
|
|
get { return this._hasFocus; }
|
|
set {
|
|
if (this._hasFocus == value) {
|
|
return;
|
|
}
|
|
|
|
this._hasFocus = value;
|
|
if (this._hasFocus) {
|
|
D.assert(!this._listenerAttached);
|
|
RawKeyboard.instance.addListener(this._handleKeyEvent);
|
|
this._listenerAttached = true;
|
|
}
|
|
else {
|
|
D.assert(this._listenerAttached);
|
|
RawKeyboard.instance.removeListener(this._handleKeyEvent);
|
|
this._listenerAttached = false;
|
|
}
|
|
|
|
this.markNeedsSemanticsUpdate();
|
|
}
|
|
}
|
|
|
|
public int? maxLines {
|
|
get { return this._maxLines; }
|
|
set {
|
|
D.assert(value == null || value > 0);
|
|
if (this._maxLines == value) {
|
|
return;
|
|
}
|
|
|
|
this._maxLines = value;
|
|
this.markNeedsTextLayout();
|
|
}
|
|
}
|
|
|
|
public Color selectionColor {
|
|
get { return this._selectionColor; }
|
|
set {
|
|
if (this._selectionColor == value) {
|
|
return;
|
|
}
|
|
|
|
this._selectionColor = value;
|
|
this.markNeedsPaint();
|
|
}
|
|
}
|
|
|
|
public float textScaleFactor {
|
|
get { return this._textPainter.textScaleFactor; }
|
|
set {
|
|
if (this._textPainter.textScaleFactor == value) {
|
|
return;
|
|
}
|
|
|
|
this._textPainter.textScaleFactor = value;
|
|
this.markNeedsTextLayout();
|
|
}
|
|
}
|
|
|
|
public TextSelection selection {
|
|
get { return this._selection; }
|
|
set {
|
|
if (this._selection == value) {
|
|
return;
|
|
}
|
|
|
|
this._selection = value;
|
|
this._selectionRects = null;
|
|
this.markNeedsPaint();
|
|
this.markNeedsSemanticsUpdate();
|
|
}
|
|
}
|
|
|
|
public ViewportOffset offset {
|
|
get { return this._offset; }
|
|
set {
|
|
D.assert(this.offset != null);
|
|
if (this._offset == value) {
|
|
return;
|
|
}
|
|
|
|
if (this.attached) {
|
|
this._offset.removeListener(this.markNeedsPaint);
|
|
}
|
|
|
|
this._offset = value;
|
|
if (this.attached) {
|
|
this._offset.addListener(this.markNeedsPaint);
|
|
}
|
|
|
|
this.markNeedsLayout();
|
|
}
|
|
}
|
|
|
|
float _cursorWidth = 1.0f;
|
|
|
|
public float cursorWidth {
|
|
get { return this._cursorWidth; }
|
|
set {
|
|
if (this._cursorWidth == value) {
|
|
return;
|
|
}
|
|
|
|
this._cursorWidth = value;
|
|
this.markNeedsLayout();
|
|
}
|
|
}
|
|
|
|
Radius _cursorRadius;
|
|
|
|
public Radius cursorRadius {
|
|
get { return this._cursorRadius; }
|
|
set {
|
|
if (this._cursorRadius == value) {
|
|
return;
|
|
}
|
|
|
|
this._cursorRadius = value;
|
|
this.markNeedsLayout();
|
|
}
|
|
}
|
|
|
|
bool? _enableInteractiveSelection;
|
|
|
|
public bool? enableInteractiveSelection {
|
|
get { return this._enableInteractiveSelection; }
|
|
set {
|
|
if (this._enableInteractiveSelection == value) {
|
|
return;
|
|
}
|
|
|
|
this._enableInteractiveSelection = value;
|
|
this.markNeedsTextLayout();
|
|
this.markNeedsSemanticsUpdate();
|
|
}
|
|
}
|
|
|
|
public float preferredLineHeight {
|
|
get { return this._textPainter.preferredLineHeight; }
|
|
}
|
|
|
|
|
|
public override void attach(object ownerObject) {
|
|
base.attach(ownerObject);
|
|
this._offset.addListener(this.markNeedsLayout);
|
|
this._showCursor.addListener(this.markNeedsPaint);
|
|
}
|
|
|
|
public override void detach() {
|
|
this._offset.removeListener(this.markNeedsLayout);
|
|
this._showCursor.removeListener(this.markNeedsPaint);
|
|
if (this._listenerAttached) {
|
|
RawKeyboard.instance.removeListener(this._handleKeyEvent);
|
|
}
|
|
|
|
base.detach();
|
|
}
|
|
|
|
/// Returns the local coordinates of the endpoints of the given selection.
|
|
///
|
|
/// If the selection is collapsed (and therefore occupies a single point), the
|
|
/// returned list is of length one. Otherwise, the selection is not collapsed
|
|
/// and the returned list is of length two. In this case, however, the two
|
|
/// points might actually be co-located (e.g., because of a bidirectional
|
|
/// selection that contains some text but whose ends meet in the middle).
|
|
///
|
|
public List<TextSelectionPoint> getEndpointsForSelection(TextSelection selection) {
|
|
D.assert(this.constraints != null);
|
|
this._layoutText(this.constraints.maxWidth);
|
|
var paintOffset = this._paintOffset;
|
|
if (selection.isCollapsed) {
|
|
var caretOffset = this._textPainter.getOffsetForCaret(selection.extendPos, this._caretPrototype);
|
|
var start = new Offset(0.0f, this.preferredLineHeight) + caretOffset + paintOffset;
|
|
return new List<TextSelectionPoint> {new TextSelectionPoint(start, null)};
|
|
}
|
|
else {
|
|
var boxes = this._textPainter.getBoxesForSelection(selection);
|
|
var start = new Offset(boxes[0].start, boxes[0].bottom) + paintOffset;
|
|
var last = boxes.Count - 1;
|
|
var end = new Offset(boxes[last].end, boxes[last].bottom) + paintOffset;
|
|
return new List<TextSelectionPoint> {
|
|
new TextSelectionPoint(start, boxes[0].direction),
|
|
new TextSelectionPoint(end, boxes[last].direction),
|
|
};
|
|
}
|
|
}
|
|
|
|
public TextPosition getPositionForPoint(Offset globalPosition) {
|
|
this._layoutText(this.constraints.maxWidth);
|
|
globalPosition -= this._paintOffset;
|
|
return this._textPainter.getPositionForOffset(this.globalToLocal(globalPosition));
|
|
}
|
|
|
|
public Rect getLocalRectForCaret(TextPosition caretPosition) {
|
|
this._layoutText(this.constraints.maxWidth);
|
|
var caretOffset = this._textPainter.getOffsetForCaret(caretPosition, this._caretPrototype);
|
|
Rect rect = Rect.fromLTWH(0.0f, 0.0f, this.cursorWidth, this.preferredLineHeight)
|
|
.shift(caretOffset + this._paintOffset);
|
|
if (this._cursorOffset != null) {
|
|
rect = rect.shift(this._cursorOffset);
|
|
}
|
|
|
|
return rect.shift(this._getPixelPerfectCursorOffset(rect));
|
|
}
|
|
|
|
public TextPosition getPositionDown(TextPosition position) {
|
|
return this._textPainter.getPositionVerticalMove(position, 1);
|
|
}
|
|
|
|
public TextPosition getPositionUp(TextPosition position) {
|
|
return this._textPainter.getPositionVerticalMove(position, -1);
|
|
}
|
|
|
|
public TextPosition getLineStartPosition(TextPosition position, TextAffinity? affinity = null) {
|
|
var line = this._textPainter.getLineRange(position);
|
|
return new TextPosition(offset: line.start, affinity: affinity ?? position.affinity);
|
|
}
|
|
|
|
public bool isLineEndOrStart(int offset) {
|
|
int lineCount = this._textPainter.getLineCount();
|
|
for (int i = 0; i < lineCount; i++) {
|
|
var line = this._textPainter.getLineRange(i);
|
|
if (line.start == offset || line.endIncludingNewLine == offset) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
public TextPosition getLineEndPosition(TextPosition position, TextAffinity? affinity = null) {
|
|
var line = this._textPainter.getLineRange(position);
|
|
return new TextPosition(offset: line.endIncludingNewLine, affinity: affinity ?? position.affinity);
|
|
}
|
|
|
|
public TextPosition getWordRight(TextPosition position) {
|
|
return this._textPainter.getWordRight(position);
|
|
}
|
|
|
|
public TextPosition getWordLeft(TextPosition position) {
|
|
return this._textPainter.getWordLeft(position);
|
|
}
|
|
|
|
public TextPosition getParagraphStart(TextPosition position, TextAffinity? affinity = null) {
|
|
D.assert(!this._needsLayout);
|
|
int lineIndex = this._textPainter.getLineIndex(position);
|
|
while (lineIndex - 1 >= 0) {
|
|
var preLine = this._textPainter.getLineRange(lineIndex - 1);
|
|
if (preLine.hardBreak) {
|
|
break;
|
|
}
|
|
|
|
lineIndex--;
|
|
}
|
|
|
|
var line = this._textPainter.getLineRange(lineIndex);
|
|
return new TextPosition(offset: line.start, affinity: affinity ?? position.affinity);
|
|
}
|
|
|
|
public TextPosition getParagraphEnd(TextPosition position, TextAffinity? affinity = null) {
|
|
D.assert(!this._needsLayout);
|
|
int lineIndex = this._textPainter.getLineIndex(position);
|
|
int maxLine = this._textPainter.getLineCount();
|
|
while (lineIndex < maxLine) {
|
|
var line = this._textPainter.getLineRange(lineIndex);
|
|
if (line.hardBreak) {
|
|
break;
|
|
}
|
|
|
|
lineIndex++;
|
|
}
|
|
|
|
return new TextPosition(offset: this._textPainter.getLineRange(lineIndex).endIncludingNewLine,
|
|
affinity: affinity ?? position.affinity);
|
|
}
|
|
|
|
public TextPosition getParagraphForward(TextPosition position, TextAffinity? affinity = null) {
|
|
var lineCount = this._textPainter.getLineCount();
|
|
Paragraph.LineRange? line = null;
|
|
for (int i = 0; i < lineCount; ++i) {
|
|
line = this._textPainter.getLineRange(i);
|
|
if (!((Paragraph.LineRange) line).hardBreak) {
|
|
continue;
|
|
}
|
|
|
|
if (((Paragraph.LineRange) line).end > position.offset) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (line == null) {
|
|
return new TextPosition(position.offset, affinity ?? position.affinity);
|
|
}
|
|
|
|
return new TextPosition(((Paragraph.LineRange) line).end, affinity ?? position.affinity);
|
|
}
|
|
|
|
|
|
public TextPosition getParagraphBackward(TextPosition position, TextAffinity? affinity = null) {
|
|
var lineCount = this._textPainter.getLineCount();
|
|
|
|
Paragraph.LineRange? line = null;
|
|
for (int i = lineCount - 1; i >= 0; --i) {
|
|
line = this._textPainter.getLineRange(i);
|
|
if (i != 0 && !this._textPainter.getLineRange(i - 1).hardBreak) {
|
|
continue;
|
|
}
|
|
|
|
if (((Paragraph.LineRange) line).start < position.offset) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (line == null) {
|
|
return new TextPosition(position.offset, affinity ?? position.affinity);
|
|
}
|
|
|
|
return new TextPosition(((Paragraph.LineRange) line).start, affinity ?? position.affinity);
|
|
}
|
|
|
|
protected override float computeMinIntrinsicWidth(float height) {
|
|
this._layoutText(float.PositiveInfinity);
|
|
return this._textPainter.minIntrinsicWidth;
|
|
}
|
|
|
|
protected override float computeMaxIntrinsicWidth(float height) {
|
|
this._layoutText(float.PositiveInfinity);
|
|
return this._textPainter.maxIntrinsicWidth + this.cursorWidth;
|
|
}
|
|
|
|
protected override float computeMinIntrinsicHeight(float width) {
|
|
return this._preferredHeight(width);
|
|
}
|
|
|
|
protected override float computeMaxIntrinsicHeight(float width) {
|
|
return this._preferredHeight(width);
|
|
}
|
|
|
|
protected override float? computeDistanceToActualBaseline(TextBaseline baseline) {
|
|
this._layoutText(this.constraints.maxWidth);
|
|
return this._textPainter.computeDistanceToActualBaseline(baseline);
|
|
}
|
|
|
|
public override void handleEvent(PointerEvent evt, HitTestEntry entry) {
|
|
if (this.ignorePointer) {
|
|
return;
|
|
}
|
|
|
|
D.assert(this.debugHandleEvent(evt, entry));
|
|
if (evt is PointerDownEvent && this.onSelectionChanged != null) {
|
|
this._tap.addPointer((PointerDownEvent) evt);
|
|
this._doubleTap.addPointer((PointerDownEvent) evt);
|
|
this._longPress.addPointer((PointerDownEvent) evt);
|
|
}
|
|
}
|
|
|
|
public void handleTapDown(TapDownDetails details) {
|
|
this._lastTapDownPosition = details.globalPosition - this._paintOffset;
|
|
if (!Application.isMobilePlatform) {
|
|
this.selectPosition(SelectionChangedCause.tap);
|
|
}
|
|
}
|
|
|
|
void _handleTapDown(TapDownDetails details) {
|
|
D.assert(!this.ignorePointer);
|
|
this.handleTapDown(details);
|
|
}
|
|
|
|
public void handleTap() {
|
|
this.selectPosition(cause: SelectionChangedCause.tap);
|
|
}
|
|
|
|
void _handleTap() {
|
|
D.assert(!this.ignorePointer);
|
|
this.handleTap();
|
|
}
|
|
|
|
void _handleDoubleTap(DoubleTapDetails details) {
|
|
D.assert(!this.ignorePointer);
|
|
this.handleDoubleTap(details);
|
|
}
|
|
|
|
public void handleDoubleTap(DoubleTapDetails details) {
|
|
// need set _lastTapDownPosition, otherwise it would be last single tap position
|
|
this._lastTapDownPosition = details.firstGlobalPosition - this._paintOffset;
|
|
this.selectWord(cause: SelectionChangedCause.doubleTap);
|
|
}
|
|
|
|
void _handleLongPress() {
|
|
D.assert(!this.ignorePointer);
|
|
this.handleLongPress();
|
|
}
|
|
|
|
public void handleLongPress() {
|
|
this.selectWord(cause: SelectionChangedCause.longPress);
|
|
}
|
|
|
|
public void selectPositionAt(Offset from = null, Offset to = null, SelectionChangedCause? cause = null) {
|
|
D.assert(cause != null);
|
|
D.assert(from != null);
|
|
|
|
this._layoutText(this.constraints.maxWidth);
|
|
if (this.onSelectionChanged != null) {
|
|
TextPosition fromPosition =
|
|
this._textPainter.getPositionForOffset(this.globalToLocal(from - this._paintOffset));
|
|
TextPosition toPosition = to == null
|
|
? null
|
|
: this._textPainter.getPositionForOffset(this.globalToLocal(to - this._paintOffset));
|
|
|
|
int baseOffset = fromPosition.offset;
|
|
int extentOffset = fromPosition.offset;
|
|
if (toPosition != null) {
|
|
baseOffset = Mathf.Min(fromPosition.offset, toPosition.offset);
|
|
extentOffset = Mathf.Max(fromPosition.offset, toPosition.offset);
|
|
}
|
|
|
|
TextSelection newSelection = new TextSelection(
|
|
baseOffset: baseOffset,
|
|
extentOffset: extentOffset,
|
|
affinity: fromPosition.affinity);
|
|
|
|
this.onSelectionChanged(newSelection, this, cause.Value);
|
|
}
|
|
}
|
|
|
|
void selectPosition(SelectionChangedCause? cause = null) {
|
|
this.selectPositionAt(from: this._lastTapDownPosition, cause: cause);
|
|
}
|
|
|
|
public void selectWord(SelectionChangedCause? cause = null) {
|
|
this.selectWordsInRange(from: this._lastTapDownPosition, cause: cause);
|
|
}
|
|
|
|
void selectWordsInRange(Offset from = null, Offset to = null, SelectionChangedCause? cause = null) {
|
|
D.assert(cause != null);
|
|
D.assert(from != null);
|
|
this._layoutText(this.constraints.maxWidth);
|
|
if (this.onSelectionChanged != null) {
|
|
TextPosition firstPosition =
|
|
this._textPainter.getPositionForOffset(this.globalToLocal(from - this._paintOffset));
|
|
TextSelection firstWord = this._selectWordAtOffset(firstPosition);
|
|
TextSelection lastWord = to == null
|
|
? firstWord
|
|
: this._selectWordAtOffset(
|
|
this._textPainter.getPositionForOffset(this.globalToLocal(to - this._paintOffset)));
|
|
|
|
this.onSelectionChanged(
|
|
new TextSelection(
|
|
baseOffset: firstWord.baseOffset,
|
|
extentOffset: lastWord.extentOffset,
|
|
affinity: firstWord.affinity),
|
|
this,
|
|
cause.Value);
|
|
}
|
|
}
|
|
|
|
public void selectWordEdge(SelectionChangedCause cause) {
|
|
this._layoutText(this.constraints.maxWidth);
|
|
D.assert(this._lastTapDownPosition != null);
|
|
if (this.onSelectionChanged != null) {
|
|
TextPosition position =
|
|
this._textPainter.getPositionForOffset(this.globalToLocal(this._lastTapDownPosition));
|
|
TextRange word = this._textPainter.getWordBoundary(position);
|
|
if (position.offset - word.start <= 1) {
|
|
this.onSelectionChanged(
|
|
TextSelection.collapsed(offset: word.start, affinity: TextAffinity.downstream),
|
|
this,
|
|
cause
|
|
);
|
|
}
|
|
else {
|
|
this.onSelectionChanged(
|
|
TextSelection.collapsed(offset: word.end, affinity: TextAffinity.upstream),
|
|
this,
|
|
cause
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
TextSelection _selectWordAtOffset(TextPosition position) {
|
|
D.assert(this._textLayoutLastWidth == this.constraints.maxWidth);
|
|
var word = this._textPainter.getWordBoundary(position);
|
|
if (position.offset >= word.end) {
|
|
return TextSelection.fromPosition(position);
|
|
}
|
|
|
|
return new TextSelection(baseOffset: word.start, extentOffset: word.end);
|
|
}
|
|
|
|
void _layoutText(float constraintWidth) {
|
|
if (this._textLayoutLastWidth == constraintWidth) {
|
|
return;
|
|
}
|
|
|
|
var caretMargin = _kCaretGap + this.cursorWidth;
|
|
var avialableWidth = Mathf.Max(0.0f, constraintWidth - caretMargin);
|
|
var maxWidth = this._isMultiline ? avialableWidth : float.PositiveInfinity;
|
|
this._textPainter.layout(minWidth: avialableWidth, maxWidth: maxWidth);
|
|
this._textLayoutLastWidth = constraintWidth;
|
|
}
|
|
|
|
Rect _getCaretPrototype {
|
|
get {
|
|
switch (Application.platform) {
|
|
case RuntimePlatform.IPhonePlayer:
|
|
return Rect.fromLTWH(0.0f, -_kCaretHeightOffset + 0.5f, this.cursorWidth,
|
|
this.preferredLineHeight + 2.0f);
|
|
default:
|
|
return Rect.fromLTWH(0.0f, _kCaretHeightOffset, this.cursorWidth,
|
|
this.preferredLineHeight - 2.0f * _kCaretHeightOffset);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
protected override void performLayout() {
|
|
this._layoutText(this.constraints.maxWidth);
|
|
this._caretPrototype = this._getCaretPrototype;
|
|
this._selectionRects = null;
|
|
|
|
var textPainterSize = this._textPainter.size;
|
|
this.size = new Size(this.constraints.maxWidth,
|
|
this.constraints.constrainHeight(this._preferredHeight(this.constraints.maxWidth)));
|
|
var contentSize = new Size(textPainterSize.width + _kCaretGap + this.cursorWidth,
|
|
textPainterSize.height);
|
|
var _maxScrollExtent = this._getMaxScrollExtend(contentSize);
|
|
this._hasVisualOverflow = _maxScrollExtent > 0.0;
|
|
this.offset.applyViewportDimension(this._viewportExtend);
|
|
this.offset.applyContentDimensions(0.0f, _maxScrollExtent);
|
|
}
|
|
|
|
public override void paint(PaintingContext context, Offset offset) {
|
|
this._layoutText(this.constraints.maxWidth);
|
|
if (this._hasVisualOverflow) {
|
|
context.pushClipRect(this.needsCompositing, offset, Offset.zero & this.size, this._paintContents);
|
|
}
|
|
else {
|
|
this._paintContents(context, offset);
|
|
}
|
|
}
|
|
|
|
protected override bool hitTestSelf(Offset position) {
|
|
return true;
|
|
}
|
|
|
|
// describeSemanticsConfiguration todo
|
|
|
|
Offset _getPixelPerfectCursorOffset(Rect caretRect) {
|
|
Offset caretPosition = this.localToGlobal(caretRect.topLeft);
|
|
float pixelMultiple = 1.0f / this._devicePixelRatio;
|
|
int quotientX = (caretPosition.dx / pixelMultiple).round();
|
|
int quotientY = (caretPosition.dy / pixelMultiple).round();
|
|
float pixelPerfectOffsetX = quotientX * pixelMultiple - caretPosition.dx;
|
|
float pixelPerfectOffsetY = quotientY * pixelMultiple - caretPosition.dy;
|
|
return new Offset(pixelPerfectOffsetX, pixelPerfectOffsetY);
|
|
}
|
|
|
|
void _paintCaret(Canvas canvas, Offset effectiveOffset, TextPosition textPosition) {
|
|
D.assert(this._textLayoutLastWidth == this.constraints.maxWidth);
|
|
var caretOffset = this._textPainter.getOffsetForCaret(textPosition, this._caretPrototype);
|
|
var paint = new Paint() {color = this._floatingCursorOn ? this.backgroundCursorColor : this._cursorColor};
|
|
Rect caretRect = this._caretPrototype.shift(caretOffset + effectiveOffset);
|
|
if (this._cursorOffset != null) {
|
|
caretRect = caretRect.shift(this._cursorOffset);
|
|
}
|
|
|
|
if (this.cursorRadius == null) {
|
|
canvas.drawRect(caretRect, paint);
|
|
}
|
|
else {
|
|
RRect caretRRect = RRect.fromRectAndRadius(caretRect, this.cursorRadius);
|
|
canvas.drawRRect(caretRRect, paint);
|
|
}
|
|
|
|
if (!caretRect.Equals(this._lastCaretRect)) {
|
|
this._lastCaretRect = caretRect;
|
|
if (this.onCaretChanged != null) {
|
|
this.onCaretChanged(caretRect);
|
|
}
|
|
}
|
|
}
|
|
|
|
public void setFloatingCursor(FloatingCursorDragState? state, Offset boundedOffset,
|
|
TextPosition lastTextPosition,
|
|
float? resetLerpValue = null) {
|
|
D.assert(boundedOffset != null);
|
|
D.assert(lastTextPosition != null);
|
|
if (state == FloatingCursorDragState.Start) {
|
|
this._relativeOrigin = new Offset(0, 0);
|
|
this._previousOffset = null;
|
|
this._resetOriginOnBottom = false;
|
|
this._resetOriginOnTop = false;
|
|
this._resetOriginOnRight = false;
|
|
this._resetOriginOnBottom = false;
|
|
}
|
|
|
|
this._floatingCursorOn = state != FloatingCursorDragState.End;
|
|
this._resetFloatingCursorAnimationValue = resetLerpValue;
|
|
if (this._floatingCursorOn) {
|
|
this._floatingCursorOffset = boundedOffset;
|
|
this._floatingCursorTextPosition = lastTextPosition;
|
|
}
|
|
|
|
this.markNeedsPaint();
|
|
}
|
|
|
|
void _paintFloatingCaret(Canvas canvas, Offset effectiveOffset) {
|
|
D.assert(this._textLayoutLastWidth == this.constraints.maxWidth);
|
|
D.assert(this._floatingCursorOn);
|
|
|
|
Paint paint = new Paint() {color = this._cursorColor.withOpacity(0.75f)};
|
|
|
|
float sizeAdjustmentX = _kFloatingCaretSizeIncrease.dx;
|
|
float sizeAdjustmentY = _kFloatingCaretSizeIncrease.dy;
|
|
|
|
if (this._resetFloatingCursorAnimationValue != null) {
|
|
sizeAdjustmentX =
|
|
MathUtils.lerpFloat(sizeAdjustmentX, 0f, this._resetFloatingCursorAnimationValue.Value);
|
|
sizeAdjustmentY =
|
|
MathUtils.lerpFloat(sizeAdjustmentY, 0f, this._resetFloatingCursorAnimationValue.Value);
|
|
}
|
|
|
|
Rect floatingCaretPrototype = Rect.fromLTRB(
|
|
this._caretPrototype.left - sizeAdjustmentX,
|
|
this._caretPrototype.top - sizeAdjustmentY,
|
|
this._caretPrototype.right + sizeAdjustmentX,
|
|
this._caretPrototype.bottom + sizeAdjustmentY
|
|
);
|
|
|
|
Rect caretRect = floatingCaretPrototype.shift(effectiveOffset);
|
|
Radius floatingCursorRadius = Radius.circular(_kFloatingCaretRadius);
|
|
RRect caretRRect = RRect.fromRectAndRadius(caretRect, floatingCursorRadius);
|
|
canvas.drawRRect(caretRRect, paint);
|
|
}
|
|
|
|
Offset _relativeOrigin = new Offset(0f, 0f);
|
|
Offset _previousOffset;
|
|
bool _resetOriginOnLeft = false;
|
|
bool _resetOriginOnRight = false;
|
|
bool _resetOriginOnTop = false;
|
|
bool _resetOriginOnBottom = false;
|
|
float? _resetFloatingCursorAnimationValue;
|
|
|
|
public Offset calculateBoundedFloatingCursorOffset(Offset rawCursorOffset) {
|
|
Offset deltaPosition = new Offset(0f, 0f);
|
|
float topBound = -this.floatingCursorAddedMargin.top;
|
|
float bottomBound = this._textPainter.height - this.preferredLineHeight +
|
|
this.floatingCursorAddedMargin.bottom;
|
|
float leftBound = -this.floatingCursorAddedMargin.left;
|
|
float rightBound = this._textPainter.width + this.floatingCursorAddedMargin.right;
|
|
|
|
if (this._previousOffset != null) {
|
|
deltaPosition = rawCursorOffset - this._previousOffset;
|
|
}
|
|
|
|
if (this._resetOriginOnLeft && deltaPosition.dx > 0) {
|
|
this._relativeOrigin = new Offset(rawCursorOffset.dx - leftBound, this._relativeOrigin.dy);
|
|
this._resetOriginOnLeft = false;
|
|
}
|
|
else if (this._resetOriginOnRight && deltaPosition.dx < 0) {
|
|
this._relativeOrigin = new Offset(rawCursorOffset.dx - rightBound, this._relativeOrigin.dy);
|
|
this._resetOriginOnRight = false;
|
|
}
|
|
|
|
if (this._resetOriginOnTop && deltaPosition.dy > 0) {
|
|
this._relativeOrigin = new Offset(this._relativeOrigin.dx, rawCursorOffset.dy - topBound);
|
|
this._resetOriginOnTop = false;
|
|
}
|
|
else if (this._resetOriginOnBottom && deltaPosition.dy < 0) {
|
|
this._relativeOrigin = new Offset(this._relativeOrigin.dx, rawCursorOffset.dy - bottomBound);
|
|
this._resetOriginOnBottom = false;
|
|
}
|
|
|
|
float currentX = rawCursorOffset.dx - this._relativeOrigin.dx;
|
|
float currentY = rawCursorOffset.dy - this._relativeOrigin.dy;
|
|
float adjustedX = Mathf.Min(Mathf.Max(currentX, leftBound), rightBound);
|
|
float adjustedY = Mathf.Min(Mathf.Max(currentY, topBound), bottomBound);
|
|
Offset adjustedOffset = new Offset(adjustedX, adjustedY);
|
|
|
|
if (currentX < leftBound && deltaPosition.dx < 0) {
|
|
this._resetOriginOnLeft = true;
|
|
}
|
|
else if (currentX > rightBound && deltaPosition.dx > 0) {
|
|
this._resetOriginOnRight = true;
|
|
}
|
|
|
|
if (currentY < topBound && deltaPosition.dy < 0) {
|
|
this._resetOriginOnTop = true;
|
|
}
|
|
else if (currentY > bottomBound && deltaPosition.dy > 0) {
|
|
this._resetOriginOnBottom = true;
|
|
}
|
|
|
|
this._previousOffset = rawCursorOffset;
|
|
|
|
return adjustedOffset;
|
|
}
|
|
|
|
void _paintSelection(Canvas canvas, Offset effectiveOffset) {
|
|
D.assert(this._textLayoutLastWidth == this.constraints.maxWidth);
|
|
D.assert(this._selectionRects != null);
|
|
var paint = new Paint() {color = this._selectionColor};
|
|
|
|
foreach (var box in this._selectionRects) {
|
|
canvas.drawRect(box.toRect().shift(effectiveOffset), paint);
|
|
}
|
|
}
|
|
|
|
void _paintContents(PaintingContext context, Offset offset) {
|
|
D.assert(this._textLayoutLastWidth == this.constraints.maxWidth);
|
|
var effectiveOffset = offset + this._paintOffset;
|
|
|
|
bool showSelection = false;
|
|
bool showCaret = false;
|
|
|
|
if (this._selection != null && !this._floatingCursorOn) {
|
|
if (this._selection.isCollapsed && this._showCursor.value && this.cursorColor != null) {
|
|
showCaret = true;
|
|
}
|
|
else if (!this._selection.isCollapsed && this._selectionColor != null) {
|
|
showSelection = true;
|
|
}
|
|
}
|
|
|
|
if (showSelection) {
|
|
this._selectionRects = this._selectionRects ?? this._textPainter.getBoxesForSelection(this._selection);
|
|
this._paintSelection(context.canvas, effectiveOffset);
|
|
}
|
|
|
|
if (this.paintCursorAboveText) {
|
|
this._textPainter.paint(context.canvas, effectiveOffset);
|
|
}
|
|
|
|
if (showCaret) {
|
|
this._paintCaret(context.canvas, effectiveOffset, this._selection.extendPos);
|
|
}
|
|
|
|
if (!this.paintCursorAboveText) {
|
|
this._textPainter.paint(context.canvas, effectiveOffset);
|
|
}
|
|
|
|
if (this._floatingCursorOn) {
|
|
if (this._resetFloatingCursorAnimationValue == null) {
|
|
this._paintCaret(context.canvas, effectiveOffset, this._floatingCursorTextPosition);
|
|
}
|
|
|
|
this._paintFloatingCaret(context.canvas, this._floatingCursorOffset);
|
|
}
|
|
}
|
|
|
|
void markNeedsSemanticsUpdate() {
|
|
// todo
|
|
}
|
|
|
|
float _preferredHeight(float width) {
|
|
if (this.maxLines != null) {
|
|
return this.preferredLineHeight * this.maxLines.Value;
|
|
}
|
|
|
|
if (!width.isFinite()) {
|
|
var text = this._textPainter.text.text;
|
|
int lines = 1;
|
|
for (int index = 0; index < text.Length; ++index) {
|
|
if (text[index] == 0x0A) {
|
|
lines += 1;
|
|
}
|
|
}
|
|
|
|
return this.preferredLineHeight * lines;
|
|
}
|
|
|
|
this._layoutText(width);
|
|
return Mathf.Max(this.preferredLineHeight, this._textPainter.height);
|
|
}
|
|
|
|
bool _isMultiline {
|
|
get { return this._maxLines != 1; }
|
|
}
|
|
|
|
Axis _viewportAxis {
|
|
get { return this._isMultiline ? Axis.vertical : Axis.horizontal; }
|
|
}
|
|
|
|
Offset _paintOffset {
|
|
get {
|
|
switch (this._viewportAxis) {
|
|
case Axis.horizontal:
|
|
return new Offset(-this.offset.pixels, 0.0f);
|
|
case Axis.vertical:
|
|
return new Offset(0.0f, -this.offset.pixels);
|
|
}
|
|
|
|
return null;
|
|
}
|
|
}
|
|
|
|
float _viewportExtend {
|
|
get {
|
|
D.assert(this.hasSize);
|
|
switch (this._viewportAxis) {
|
|
case Axis.horizontal:
|
|
return this.size.width;
|
|
case Axis.vertical:
|
|
return this.size.height;
|
|
}
|
|
|
|
return 0.0f;
|
|
}
|
|
}
|
|
|
|
float _getMaxScrollExtend(Size contentSize) {
|
|
D.assert(this.hasSize);
|
|
switch (this._viewportAxis) {
|
|
case Axis.horizontal:
|
|
return Mathf.Max(0.0f, contentSize.width - this.size.width);
|
|
case Axis.vertical:
|
|
return Mathf.Max(0.0f, contentSize.height - this.size.height);
|
|
}
|
|
|
|
return 0.0f;
|
|
}
|
|
|
|
public override Rect describeApproximatePaintClip(RenderObject child) {
|
|
return this._hasVisualOverflow ? Offset.zero & this.size : null;
|
|
}
|
|
|
|
public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {
|
|
base.debugFillProperties(properties);
|
|
properties.add(new DiagnosticsProperty<Color>("cursorColor", this.cursorColor));
|
|
properties.add(new DiagnosticsProperty<ValueNotifier<bool>>("showCursor", this.showCursor));
|
|
properties.add(new DiagnosticsProperty<int?>("maxLines", this.maxLines));
|
|
properties.add(new DiagnosticsProperty<Color>("selectionColor", this.selectionColor));
|
|
properties.add(new DiagnosticsProperty<float>("textScaleFactor", this.textScaleFactor));
|
|
properties.add(new DiagnosticsProperty<TextSelection>("selection", this.selection));
|
|
properties.add(new DiagnosticsProperty<ViewportOffset>("offset", this.offset));
|
|
}
|
|
|
|
public override List<DiagnosticsNode> debugDescribeChildren() {
|
|
return new List<DiagnosticsNode> {
|
|
this.text.toDiagnosticsNode(
|
|
name: "text",
|
|
style: DiagnosticsTreeStyle.transition
|
|
),
|
|
};
|
|
}
|
|
}
|
|
}
|