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680 行
27 KiB
680 行
27 KiB
using System;
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using System.Collections.Generic;
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using Unity.UIWidgets.animation;
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using Unity.UIWidgets.async;
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using Unity.UIWidgets.foundation;
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using Unity.UIWidgets.gestures;
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using Unity.UIWidgets.rendering;
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using Unity.UIWidgets.scheduler;
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using Unity.UIWidgets.service;
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using Unity.UIWidgets.ui;
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namespace Unity.UIWidgets.widgets {
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static class TextSelectionUtils {
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public static TimeSpan _kDragSelectionUpdateThrottle = new TimeSpan(0, 0, 0, 0, 50);
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}
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public enum TextSelectionHandleType {
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left,
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right,
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collapsed,
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}
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enum _TextSelectionHandlePosition {
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start,
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end
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}
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public delegate void TextSelectionOverlayChanged(TextEditingValue value, Rect caretRect);
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public delegate void DragSelectionUpdateCallback(DragStartDetails startDetails, DragUpdateDetails updateDetails);
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public abstract class TextSelectionControls {
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public abstract Widget buildHandle(BuildContext context, TextSelectionHandleType type, float textLineHeight);
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public abstract Widget buildToolbar(BuildContext context, Rect globalEditableRegion, Offset position,
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TextSelectionDelegate selectionDelegate);
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public abstract Size handleSize { get; }
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public virtual bool canCut(TextSelectionDelegate selectionDelegate) {
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return !selectionDelegate.textEditingValue.selection.isCollapsed;
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}
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public virtual bool canCopy(TextSelectionDelegate selectionDelegate) {
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return !selectionDelegate.textEditingValue.selection.isCollapsed;
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}
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public virtual bool canPaste(TextSelectionDelegate selectionDelegate) {
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// TODO in flutter: return false when clipboard is empty
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return true;
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}
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public virtual bool canSelectAll(TextSelectionDelegate selectionDelegate) {
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return selectionDelegate.textEditingValue.text.isNotEmpty() &&
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selectionDelegate.textEditingValue.selection.isCollapsed;
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}
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public void handleCut(TextSelectionDelegate selectionDelegate) {
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TextEditingValue value = selectionDelegate.textEditingValue;
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Clipboard.setData(new ClipboardData(
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text: value.selection.textInside(value.text)
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));
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selectionDelegate.textEditingValue = new TextEditingValue(
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text: value.selection.textBefore(value.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
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)
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);
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selectionDelegate.bringIntoView(selectionDelegate.textEditingValue.selection.extendPos);
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selectionDelegate.hideToolbar();
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}
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public void handleCopy(TextSelectionDelegate selectionDelegate) {
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TextEditingValue value = selectionDelegate.textEditingValue;
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Clipboard.setData(new ClipboardData(
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text: value.selection.textInside(value.text)
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));
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selectionDelegate.textEditingValue = new TextEditingValue(
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text: value.text,
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selection: TextSelection.collapsed(offset: value.selection.end)
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);
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selectionDelegate.bringIntoView(selectionDelegate.textEditingValue.selection.extendPos);
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selectionDelegate.hideToolbar();
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}
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public void handlePaste(TextSelectionDelegate selectionDelegate) {
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TextEditingValue value = selectionDelegate.textEditingValue; // Snapshot the input before using `await`.
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Clipboard.getData(Clipboard.kTextPlain).Then((data) => {
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if (data != null) {
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selectionDelegate.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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selectionDelegate.bringIntoView(selectionDelegate.textEditingValue.selection.extendPos);
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selectionDelegate.hideToolbar();
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});
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}
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public void handleSelectAll(TextSelectionDelegate selectionDelegate) {
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selectionDelegate.textEditingValue = new TextEditingValue(
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text: selectionDelegate.textEditingValue.text,
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selection: new TextSelection(
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baseOffset: 0,
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extentOffset: selectionDelegate.textEditingValue.text.Length
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)
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);
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selectionDelegate.bringIntoView(selectionDelegate.textEditingValue.selection.extendPos);
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}
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}
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public class TextSelectionOverlay {
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public TextSelectionOverlay(TextEditingValue value = null,
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BuildContext context = null, Widget debugRequiredFor = null,
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LayerLink layerLink = null,
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RenderEditable renderObject = null,
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TextSelectionControls selectionControls = null,
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TextSelectionDelegate selectionDelegate = null,
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DragStartBehavior? dragStartBehavior = null) {
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D.assert(value != null);
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D.assert(context != null);
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this.context = context;
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this.debugRequiredFor = debugRequiredFor;
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this.layerLink = layerLink;
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this.renderObject = renderObject;
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this.selectionControls = selectionControls;
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this.selectionDelegate = selectionDelegate;
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this._value = value;
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OverlayState overlay = Overlay.of(context);
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D.assert(overlay != null);
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this._handleController = new AnimationController(duration: _fadeDuration, vsync: overlay);
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this._toolbarController = new AnimationController(duration: _fadeDuration, vsync: overlay);
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this.dragStartBehavior = dragStartBehavior;
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}
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public readonly BuildContext context;
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public readonly Widget debugRequiredFor;
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public readonly LayerLink layerLink;
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public readonly RenderEditable renderObject;
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public readonly TextSelectionControls selectionControls;
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public readonly TextSelectionDelegate selectionDelegate;
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public readonly DragStartBehavior? dragStartBehavior;
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public static TimeSpan _fadeDuration = TimeSpan.FromMilliseconds(150);
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AnimationController _handleController;
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AnimationController _toolbarController;
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Animation<float> _handleOpacity {
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get { return this._handleController.view; }
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}
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Animation<float> _toolbarOpacity {
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get { return this._toolbarController.view; }
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}
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TextEditingValue _value;
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List<OverlayEntry> _handles;
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OverlayEntry _toolbar;
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TextSelection _selection {
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get { return this._value.selection; }
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}
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public void showHandles() {
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D.assert(this._handles == null);
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this._handles = new List<OverlayEntry> {
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new OverlayEntry(builder: (BuildContext context) =>
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this._buildHandle(context, _TextSelectionHandlePosition.start)),
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new OverlayEntry(builder: (BuildContext context) =>
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this._buildHandle(context, _TextSelectionHandlePosition.end)),
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};
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Overlay.of(this.context, debugRequiredFor: this.debugRequiredFor).insertAll(this._handles);
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this._handleController.forward(from: 0.0f);
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}
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public void showToolbar() {
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D.assert(this._toolbar == null);
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this._toolbar = new OverlayEntry(builder: this._buildToolbar);
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Overlay.of(this.context, debugRequiredFor: this.debugRequiredFor).insert(this._toolbar);
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this._toolbarController.forward(from: 0.0f);
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}
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public void update(TextEditingValue newValue) {
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if (this._value == newValue) {
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return;
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}
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this._value = newValue;
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if (SchedulerBinding.instance.schedulerPhase == SchedulerPhase.persistentCallbacks) {
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SchedulerBinding.instance.addPostFrameCallback((duration) => this._markNeedsBuild());
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}
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else {
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this._markNeedsBuild();
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}
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}
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public void updateForScroll() {
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this._markNeedsBuild();
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}
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void _markNeedsBuild() {
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if (this._handles != null) {
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this._handles[0].markNeedsBuild();
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this._handles[1].markNeedsBuild();
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}
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this._toolbar?.markNeedsBuild();
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}
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public bool handlesAreVisible {
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get { return this._handles != null; }
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}
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public bool toolbarIsVisible {
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get { return this._toolbar != null; }
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}
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public void hide() {
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if (this._handles != null) {
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this._handles[0].remove();
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this._handles[1].remove();
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this._handles = null;
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}
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this._toolbar?.remove();
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this._toolbar = null;
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this._handleController.stop();
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this._toolbarController.stop();
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}
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public void dispose() {
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this.hide();
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this._handleController.dispose();
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this._toolbarController.dispose();
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}
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Widget _buildHandle(BuildContext context, _TextSelectionHandlePosition position) {
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if ((this._selection.isCollapsed && position == _TextSelectionHandlePosition.end) ||
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this.selectionControls == null) {
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return new Container(); // hide the second handle when collapsed
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}
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return new FadeTransition(
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opacity: this._handleOpacity,
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child: new _TextSelectionHandleOverlay(
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onSelectionHandleChanged: (TextSelection newSelection) => {
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this._handleSelectionHandleChanged(newSelection, position);
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},
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onSelectionHandleTapped: this._handleSelectionHandleTapped,
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layerLink: this.layerLink,
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renderObject: this.renderObject,
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selection: this._selection,
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selectionControls: this.selectionControls,
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position: position,
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dragStartBehavior: this.dragStartBehavior ?? DragStartBehavior.down
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)
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);
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}
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Widget _buildToolbar(BuildContext context) {
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if (this.selectionControls == null) {
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return new Container();
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}
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// Find the horizontal midpoint, just above the selected text.
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List<TextSelectionPoint> endpoints = this.renderObject.getEndpointsForSelection(this._selection);
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Offset midpoint = new Offset(
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(endpoints.Count == 1) ? endpoints[0].point.dx : (endpoints[0].point.dx + endpoints[1].point.dx) / 2.0f,
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endpoints[0].point.dy - this.renderObject.preferredLineHeight
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);
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Rect editingRegion = Rect.fromPoints(this.renderObject.localToGlobal(Offset.zero),
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this.renderObject.localToGlobal(this.renderObject.size.bottomRight(Offset.zero))
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);
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return new FadeTransition(
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opacity: this._toolbarOpacity,
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child: new CompositedTransformFollower(
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link: this.layerLink,
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showWhenUnlinked: false,
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offset: -editingRegion.topLeft,
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child: this.selectionControls.buildToolbar(context, editingRegion, midpoint, this.selectionDelegate)
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)
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);
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}
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void _handleSelectionHandleChanged(TextSelection newSelection, _TextSelectionHandlePosition position) {
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TextPosition textPosition = null;
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switch (position) {
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case _TextSelectionHandlePosition.start:
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textPosition = newSelection.basePos;
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break;
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case _TextSelectionHandlePosition.end:
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textPosition = newSelection.extendPos;
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break;
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}
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this.selectionDelegate.textEditingValue =
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this._value.copyWith(selection: newSelection, composing: TextRange.empty);
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this.selectionDelegate.bringIntoView(textPosition);
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}
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void _handleSelectionHandleTapped() {
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if (this._value.selection.isCollapsed) {
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if (this._toolbar != null) {
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this._toolbar?.remove();
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this._toolbar = null;
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}
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else {
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this.showToolbar();
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}
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}
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}
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}
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class _TextSelectionHandleOverlay : StatefulWidget {
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internal _TextSelectionHandleOverlay(
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Key key = null,
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TextSelection selection = null,
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_TextSelectionHandlePosition position = _TextSelectionHandlePosition.start,
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LayerLink layerLink = null,
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RenderEditable renderObject = null,
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ValueChanged<TextSelection> onSelectionHandleChanged = null,
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VoidCallback onSelectionHandleTapped = null,
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TextSelectionControls selectionControls = null,
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DragStartBehavior dragStartBehavior = DragStartBehavior.down
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) : base(key: key) {
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this.selection = selection;
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this.position = position;
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this.layerLink = layerLink;
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this.renderObject = renderObject;
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this.onSelectionHandleChanged = onSelectionHandleChanged;
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this.onSelectionHandleTapped = onSelectionHandleTapped;
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this.selectionControls = selectionControls;
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this.dragStartBehavior = dragStartBehavior;
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}
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public readonly TextSelection selection;
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public readonly _TextSelectionHandlePosition position;
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public readonly LayerLink layerLink;
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public readonly RenderEditable renderObject;
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public readonly ValueChanged<TextSelection> onSelectionHandleChanged;
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public readonly VoidCallback onSelectionHandleTapped;
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public readonly TextSelectionControls selectionControls;
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public readonly DragStartBehavior dragStartBehavior;
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public override State createState() {
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return new _TextSelectionHandleOverlayState();
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}
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}
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class _TextSelectionHandleOverlayState : State<_TextSelectionHandleOverlay> {
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Offset _dragPosition;
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void _handleDragStart(DragStartDetails details) {
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this._dragPosition = details.globalPosition +
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new Offset(0.0f, -this.widget.selectionControls.handleSize.height);
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}
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void _handleDragUpdate(DragUpdateDetails details) {
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this._dragPosition += details.delta;
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TextPosition position = this.widget.renderObject.getPositionForPoint(this._dragPosition);
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if (this.widget.selection.isCollapsed) {
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this.widget.onSelectionHandleChanged(TextSelection.fromPosition(position));
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return;
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}
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TextSelection newSelection = null;
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switch (this.widget.position) {
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case _TextSelectionHandlePosition.start:
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newSelection = new TextSelection(
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baseOffset: position.offset,
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extentOffset: this.widget.selection.extentOffset
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);
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break;
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case _TextSelectionHandlePosition.end:
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newSelection = new TextSelection(
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baseOffset: this.widget.selection.baseOffset,
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extentOffset: position.offset
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);
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break;
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}
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if (newSelection.baseOffset >= newSelection.extentOffset) {
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return; // don't allow order swapping.
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}
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this.widget.onSelectionHandleChanged(newSelection);
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}
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void _handleTap() {
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this.widget.onSelectionHandleTapped();
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}
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public override Widget build(BuildContext context) {
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List<TextSelectionPoint> endpoints =
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this.widget.renderObject.getEndpointsForSelection(this.widget.selection);
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Offset point = null;
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TextSelectionHandleType type = TextSelectionHandleType.left;
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switch (this.widget.position) {
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case _TextSelectionHandlePosition.start:
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point = endpoints[0].point;
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type = this._chooseType(endpoints[0], TextSelectionHandleType.left, TextSelectionHandleType.right);
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break;
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case _TextSelectionHandlePosition.end:
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D.assert(endpoints.Count == 2);
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point = endpoints[1].point;
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type = this._chooseType(endpoints[1], TextSelectionHandleType.right, TextSelectionHandleType.left);
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break;
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}
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return new CompositedTransformFollower(
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link: this.widget.layerLink,
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showWhenUnlinked: false,
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child: new GestureDetector(
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dragStartBehavior: this.widget.dragStartBehavior,
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onPanStart: this._handleDragStart,
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onPanUpdate: this._handleDragUpdate,
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onTap: this._handleTap,
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child: new Stack(
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overflow: Overflow.visible,
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children: new List<Widget>() {
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new Positioned(
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left: point.dx,
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top: point.dy,
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child: this.widget.selectionControls.buildHandle(context, type,
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this.widget.renderObject.preferredLineHeight)
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)
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}
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)
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)
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);
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}
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TextSelectionHandleType _chooseType(
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TextSelectionPoint endpoint,
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TextSelectionHandleType ltrType,
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TextSelectionHandleType rtlType
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) {
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if (this.widget.selection.isCollapsed) {
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return TextSelectionHandleType.collapsed;
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}
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D.assert(endpoint.direction != null);
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switch (endpoint.direction) {
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case TextDirection.ltr:
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return ltrType;
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case TextDirection.rtl:
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return rtlType;
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}
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D.assert(() => throw new UIWidgetsError($"invalid endpoint.direction {endpoint.direction}"));
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return ltrType;
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}
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}
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public class TextSelectionGestureDetector : StatefulWidget {
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public TextSelectionGestureDetector(
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Key key = null,
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GestureTapDownCallback onTapDown = null,
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GestureTapUpCallback onSingleTapUp = null,
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GestureTapCancelCallback onSingleTapCancel = null,
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GestureLongPressCallback onSingleLongTapStart = null,
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GestureTapDownCallback onDoubleTapDown = null,
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GestureDragStartCallback onDragSelectionStart = null,
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DragSelectionUpdateCallback onDragSelectionUpdate = null,
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GestureDragEndCallback onDragSelectionEnd = null,
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HitTestBehavior? behavior = null,
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Widget child = null
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) : base(key: key) {
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D.assert(child != null);
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this.onTapDown = onTapDown;
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this.onSingleTapUp = onSingleTapUp;
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this.onSingleTapCancel = onSingleTapCancel;
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this.onSingleLongTapStart = onSingleLongTapStart;
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this.onDoubleTapDown = onDoubleTapDown;
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this.onDragSelectionStart = onDragSelectionStart;
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this.onDragSelectionUpdate = onDragSelectionUpdate;
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this.onDragSelectionEnd = onDragSelectionEnd;
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this.behavior = behavior;
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this.child = child;
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}
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public readonly GestureTapDownCallback onTapDown;
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public readonly GestureTapUpCallback onSingleTapUp;
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public readonly GestureTapCancelCallback onSingleTapCancel;
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public readonly GestureLongPressCallback onSingleLongTapStart;
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public readonly GestureTapDownCallback onDoubleTapDown;
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public readonly GestureDragStartCallback onDragSelectionStart;
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public readonly DragSelectionUpdateCallback onDragSelectionUpdate;
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public readonly GestureDragEndCallback onDragSelectionEnd;
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public HitTestBehavior? behavior;
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public readonly Widget child;
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public override State createState() {
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return new _TextSelectionGestureDetectorState();
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}
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}
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class _TextSelectionGestureDetectorState : State<TextSelectionGestureDetector> {
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Timer _doubleTapTimer;
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Offset _lastTapOffset;
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bool _isDoubleTap = false;
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public override void dispose() {
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this._doubleTapTimer?.cancel();
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this._dragUpdateThrottleTimer?.cancel();
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base.dispose();
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}
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void _handleTapDown(TapDownDetails details) {
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if (this.widget.onTapDown != null) {
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this.widget.onTapDown(details);
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}
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if (this._doubleTapTimer != null &&
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this._isWithinDoubleTapTolerance(details.globalPosition)) {
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if (this.widget.onDoubleTapDown != null) {
|
|
this.widget.onDoubleTapDown(details);
|
|
}
|
|
|
|
this._doubleTapTimer.cancel();
|
|
this._doubleTapTimeout();
|
|
this._isDoubleTap = true;
|
|
}
|
|
}
|
|
|
|
void _handleTapUp(TapUpDetails details) {
|
|
if (!this._isDoubleTap) {
|
|
if (this.widget.onSingleTapUp != null) {
|
|
this.widget.onSingleTapUp(details);
|
|
}
|
|
|
|
this._lastTapOffset = details.globalPosition;
|
|
this._doubleTapTimer = Window.instance.run(Constants.kDoubleTapTimeout, this._doubleTapTimeout);
|
|
}
|
|
|
|
this._isDoubleTap = false;
|
|
}
|
|
|
|
void _handleTapCancel() {
|
|
if (this.widget.onSingleTapCancel != null) {
|
|
this.widget.onSingleTapCancel();
|
|
}
|
|
}
|
|
|
|
DragStartDetails _lastDragStartDetails;
|
|
DragUpdateDetails _lastDragUpdateDetails;
|
|
Timer _dragUpdateThrottleTimer;
|
|
|
|
void _handleDragStart(DragStartDetails details) {
|
|
D.assert(this._lastDragStartDetails == null);
|
|
this._lastDragStartDetails = details;
|
|
if (this.widget.onDragSelectionStart != null) {
|
|
this.widget.onDragSelectionStart(details);
|
|
}
|
|
}
|
|
|
|
void _handleDragUpdate(DragUpdateDetails details) {
|
|
this._lastDragUpdateDetails = details;
|
|
this._dragUpdateThrottleTimer = this._dragUpdateThrottleTimer ??
|
|
Window.instance.run(TextSelectionUtils._kDragSelectionUpdateThrottle,
|
|
this._handleDragUpdateThrottled);
|
|
}
|
|
|
|
void _handleDragUpdateThrottled() {
|
|
D.assert(this._lastDragStartDetails != null);
|
|
D.assert(this._lastDragUpdateDetails != null);
|
|
if (this.widget.onDragSelectionUpdate != null) {
|
|
this.widget.onDragSelectionUpdate(this._lastDragStartDetails, this._lastDragUpdateDetails);
|
|
}
|
|
|
|
this._dragUpdateThrottleTimer = null;
|
|
this._lastDragUpdateDetails = null;
|
|
}
|
|
|
|
void _handleDragEnd(DragEndDetails details) {
|
|
D.assert(this._lastDragStartDetails != null);
|
|
if (this._lastDragUpdateDetails != null) {
|
|
this._dragUpdateThrottleTimer.cancel();
|
|
this._handleDragUpdateThrottled();
|
|
}
|
|
|
|
if (this.widget.onDragSelectionEnd != null) {
|
|
this.widget.onDragSelectionEnd(details);
|
|
}
|
|
|
|
this._dragUpdateThrottleTimer = null;
|
|
this._lastDragStartDetails = null;
|
|
this._lastDragUpdateDetails = null;
|
|
}
|
|
|
|
void _handleLongPressStart() {
|
|
if (!this._isDoubleTap && this.widget.onSingleLongTapStart != null) {
|
|
this.widget.onSingleLongTapStart();
|
|
}
|
|
}
|
|
|
|
void _doubleTapTimeout() {
|
|
this._doubleTapTimer = null;
|
|
this._lastTapOffset = null;
|
|
}
|
|
|
|
bool _isWithinDoubleTapTolerance(Offset secondTapOffset) {
|
|
D.assert(secondTapOffset != null);
|
|
if (this._lastTapOffset == null) {
|
|
return false;
|
|
}
|
|
|
|
Offset difference = secondTapOffset - this._lastTapOffset;
|
|
return difference.distance <= Constants.kDoubleTapSlop;
|
|
}
|
|
|
|
public override Widget build(BuildContext context) {
|
|
Dictionary<Type, GestureRecognizerFactory> gestures = new Dictionary<Type, GestureRecognizerFactory>();
|
|
|
|
gestures.Add(typeof(TapGestureRecognizer), new GestureRecognizerFactoryWithHandlers<TapGestureRecognizer>(
|
|
() => new TapGestureRecognizer(debugOwner: this),
|
|
instance => {
|
|
instance.onTapDown = this._handleTapDown;
|
|
instance.onTapUp = this._handleTapUp;
|
|
instance.onTapCancel = this._handleTapCancel;
|
|
}
|
|
)
|
|
);
|
|
|
|
if (this.widget.onSingleLongTapStart != null) {
|
|
gestures[typeof(LongPressGestureRecognizer)] =
|
|
new GestureRecognizerFactoryWithHandlers<LongPressGestureRecognizer>(
|
|
() => new LongPressGestureRecognizer(debugOwner: this, kind: PointerDeviceKind.touch),
|
|
instance => { instance.onLongPress = this._handleLongPressStart; });
|
|
}
|
|
|
|
if (this.widget.onDragSelectionStart != null ||
|
|
this.widget.onDragSelectionUpdate != null ||
|
|
this.widget.onDragSelectionEnd != null) {
|
|
gestures.Add(typeof(HorizontalDragGestureRecognizer),
|
|
new GestureRecognizerFactoryWithHandlers<HorizontalDragGestureRecognizer>(
|
|
() => new HorizontalDragGestureRecognizer(debugOwner: this, kind: PointerDeviceKind.mouse),
|
|
instance => {
|
|
instance.dragStartBehavior = DragStartBehavior.down;
|
|
instance.onStart = this._handleDragStart;
|
|
instance.onUpdate = this._handleDragUpdate;
|
|
instance.onEnd = this._handleDragEnd;
|
|
}
|
|
)
|
|
);
|
|
}
|
|
|
|
return new RawGestureDetector(
|
|
gestures: gestures,
|
|
behavior: this.widget.behavior,
|
|
child: this.widget.child
|
|
);
|
|
}
|
|
}
|
|
}
|