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1057 行
41 KiB
1057 行
41 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.async2;
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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.rendering;
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using Unity.UIWidgets.scheduler2;
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using Unity.UIWidgets.service;
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using Unity.UIWidgets.ui;
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using Unity.UIWidgets.widgets;
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using UnityEngine;
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using Object = System.Object;
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using Rect = Unity.UIWidgets.ui.Rect;
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using TextRange = Unity.UIWidgets.ui.TextRange;
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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 Offset getHandleAnchor(TextSelectionHandleType type, float textLineHeight);
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public abstract Widget buildToolbar(
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BuildContext context,
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Rect globalEditableRegion,
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float textLineHeight,
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Offset position,
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List<TextSelectionPoint> endpoints,
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TextSelectionDelegate selectionDelegate
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);
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public abstract Size getHandleSize(float textLineHeight);
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public virtual bool canCut(TextSelectionDelegate _delegate) {
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return _delegate.cutEnabled && !_delegate.textEditingValue.selection.isCollapsed;
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}
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public bool canCopy(TextSelectionDelegate _delegate) {
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return _delegate.copyEnabled && !_delegate.textEditingValue.selection.isCollapsed;
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}
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public bool canPaste(TextSelectionDelegate _delegate) {
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// TODO(goderbauer): return false when clipboard is empty, https://github.com/flutter/flutter/issues/11254
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return _delegate.pasteEnabled;
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}
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public bool canSelectAll(TextSelectionDelegate _delegate) {
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return _delegate.selectAllEnabled
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&& _delegate.textEditingValue.text.isNotEmpty()
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&& _delegate.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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selectionDelegate.bringIntoView(selectionDelegate.textEditingValue.selection.extendPos);
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selectionDelegate.hideToolbar();
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}
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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(
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TextEditingValue value = null,
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BuildContext context = null,
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Widget debugRequiredFor = null,
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LayerLink toolbarLayerLink = null,
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LayerLink startHandleLayerLink = null,
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LayerLink endHandleLayerLink = null,
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RenderEditable renderObject = null,
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TextSelectionControls selectionControls = null,
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bool handlesVisible = false,
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TextSelectionDelegate selectionDelegate = null,
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DragStartBehavior dragStartBehavior = DragStartBehavior.start,
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VoidCallback onSelectionHandleTapped = null) {
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D.assert(value != null);
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D.assert(context != null);
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D.assert(handlesVisible != null);
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_handlesVisible = handlesVisible;
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this.context = context;
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this.debugRequiredFor = debugRequiredFor;
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this.toolbarLayerLink = toolbarLayerLink;
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this.startHandleLayerLink = startHandleLayerLink;
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this.endHandleLayerLink = endHandleLayerLink;
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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.onSelectionHandleTapped = onSelectionHandleTapped;
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_value = value;
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OverlayState overlay = Overlay.of(context, rootOverlay: true);
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D.assert(overlay != null, () => $"No Overlay widget exists above {context}.\n" +
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"Usually the Navigator created by WidgetsApp provides the overlay. Perhaps your " +
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"app content was created above the Navigator with the WidgetsApp builder parameter.");
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_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 toolbarLayerLink;
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public readonly LayerLink startHandleLayerLink;
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public readonly LayerLink endHandleLayerLink;
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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 readonly VoidCallback onSelectionHandleTapped;
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public static readonly TimeSpan fadeDuration = TimeSpan.FromMilliseconds(150);
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AnimationController _toolbarController;
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Animation<float> _toolbarOpacity {
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get { return _toolbarController.view; }
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}
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TextEditingValue value {
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get { return _value; }
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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 _value.selection; }
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}
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bool _handlesVisible = false;
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public bool handlesVisible {
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get {
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return _handlesVisible;
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}
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set {
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D.assert(value != null);
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if (_handlesVisible == value)
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return;
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_handlesVisible = value;
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// If we are in build state, it will be too late to update visibility.
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// We will need to schedule the build in next frame.
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if (SchedulerBinding.instance.schedulerPhase == SchedulerPhase.persistentCallbacks) {
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SchedulerBinding.instance.addPostFrameCallback((TimeSpan timespan) => {
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_markNeedsBuild();
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});
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} else {
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_markNeedsBuild();
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}
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}
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}
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public void showHandles() {
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D.assert(_handles == null);
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_handles = new List<OverlayEntry> {
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new OverlayEntry(builder: (BuildContext context) =>
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_buildHandle(context, _TextSelectionHandlePosition.start)),
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new OverlayEntry(builder: (BuildContext context) =>
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_buildHandle(context, _TextSelectionHandlePosition.end)),
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};
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Overlay.of(this.context, rootOverlay: true, debugRequiredFor: debugRequiredFor).insertAll(_handles);
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}
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public void hideHandles() {
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if (_handles != null) {
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_handles[0].remove();
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_handles[1].remove();
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_handles = null;
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}
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}
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public void showToolbar() {
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D.assert(_toolbar == null);
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_toolbar = new OverlayEntry(builder: _buildToolbar);
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Overlay.of(context, rootOverlay: true, debugRequiredFor: debugRequiredFor).insert(_toolbar);
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_toolbarController.forward(from: 0.0f);
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}
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public void update(TextEditingValue newValue) {
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if (_value == newValue) {
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return;
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}
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_value = newValue;
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if (SchedulerBinding.instance.schedulerPhase == SchedulerPhase.persistentCallbacks) {
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SchedulerBinding.instance.addPostFrameCallback((duration) => _markNeedsBuild());
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}
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else {
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_markNeedsBuild();
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}
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}
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public void updateForScroll() {
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_markNeedsBuild();
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}
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void _markNeedsBuild() {
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if (_handles != null) {
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_handles[0].markNeedsBuild();
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_handles[1].markNeedsBuild();
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}
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_toolbar?.markNeedsBuild();
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}
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public bool handlesAreVisible {
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get { return _handles != null && handlesVisible; }
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}
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public bool toolbarIsVisible {
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get { return _toolbar != null; }
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}
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public void hide() {
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if (_handles != null) {
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_handles[0].remove();
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_handles[1].remove();
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_handles = null;
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}
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if (_toolbar != null) {
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hideToolbar();
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}
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}
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void hideToolbar() {
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D.assert(_toolbar != null);
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_toolbarController.stop();
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_toolbar.remove();
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_toolbar = null;
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}
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public void dispose() {
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hide();
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_toolbarController.dispose();
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}
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Widget _buildHandle(BuildContext context, _TextSelectionHandlePosition position) {
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if ((_selection.isCollapsed && position == _TextSelectionHandlePosition.end) ||
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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 Visibility(
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visible: handlesVisible,
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child: new _TextSelectionHandleOverlay(
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onSelectionHandleChanged: (TextSelection newSelection) => {
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_handleSelectionHandleChanged(newSelection, position);
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},
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onSelectionHandleTapped: onSelectionHandleTapped,
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startHandleLayerLink: startHandleLayerLink,
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endHandleLayerLink: endHandleLayerLink,
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renderObject: renderObject,
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selection: _selection,
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selectionControls: selectionControls,
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position: position,
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dragStartBehavior: dragStartBehavior
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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 (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 = renderObject.getEndpointsForSelection(_selection);
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Rect editingRegion = Rect.fromPoints(renderObject.localToGlobal(Offset.zero),
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renderObject.localToGlobal(renderObject.size.bottomRight(Offset.zero))
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);
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bool isMultiline = endpoints.last().point.dy - endpoints.first().point.dy >
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renderObject.preferredLineHeight / 2;
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float midX = isMultiline
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? editingRegion.width / 2
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: (endpoints.first().point.dx + endpoints.last().point.dx) / 2;
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Offset midpoint = new Offset(
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midX,
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endpoints[0].point.dy - renderObject.preferredLineHeight
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);
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return new FadeTransition(
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opacity: _toolbarOpacity,
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child: new CompositedTransformFollower(
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link: toolbarLayerLink,
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showWhenUnlinked: false,
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offset: -editingRegion.topLeft,
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child: selectionControls.buildToolbar(
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context,
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editingRegion,
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renderObject.preferredLineHeight,
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midpoint,
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endpoints,
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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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selectionDelegate.textEditingValue =
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_value.copyWith(selection: newSelection, composing: TextRange.empty);
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selectionDelegate.bringIntoView(textPosition);
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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 startHandleLayerLink = null,
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LayerLink endHandleLayerLink = 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.start
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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.startHandleLayerLink = startHandleLayerLink;
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this.endHandleLayerLink = endHandleLayerLink;
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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 startHandleLayerLink;
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public readonly LayerLink endHandleLayerLink;
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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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internal ValueListenable<bool> _visibility {
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get {
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switch (position) {
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case _TextSelectionHandlePosition.start:
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return renderObject.selectionStartInViewport;
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case _TextSelectionHandlePosition.end:
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return renderObject.selectionEndInViewport;
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}
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return null;
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}
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}
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}
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class _TextSelectionHandleOverlayState : SingleTickerProviderStateMixin<_TextSelectionHandleOverlay> {
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Offset _dragPosition;
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AnimationController _controller;
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const float kMinInteractiveDimension = 48.0f;
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Animation<float> _opacity {
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get { return _controller.view; }
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}
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public override void initState() {
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base.initState();
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_controller = new AnimationController(duration: TextSelectionOverlay.fadeDuration, vsync: this);
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_handleVisibilityChanged();
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widget._visibility.addListener(_handleVisibilityChanged);
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}
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void _handleVisibilityChanged() {
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if (widget._visibility.value) {
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_controller.forward();
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}
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else {
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_controller.reverse();
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}
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}
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public override void didUpdateWidget(StatefulWidget oldWidget) {
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base.didUpdateWidget(oldWidget);
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(oldWidget as _TextSelectionHandleOverlay)._visibility.removeListener(_handleVisibilityChanged);
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_handleVisibilityChanged();
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widget._visibility.addListener(_handleVisibilityChanged);
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}
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public override void dispose() {
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widget._visibility.removeListener(_handleVisibilityChanged);
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_controller.dispose();
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base.dispose();
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}
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void _handleDragStart(DragStartDetails details) {
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Size handleSize = widget.selectionControls.getHandleSize(
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widget.renderObject.preferredLineHeight
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);
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_dragPosition = details.globalPosition + new Offset(0.0f, -handleSize.height);
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}
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void _handleDragUpdate(DragUpdateDetails details) {
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_dragPosition += details.delta;
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TextPosition position = widget.renderObject.getPositionForPoint(_dragPosition);
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if (widget.selection.isCollapsed) {
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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 (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: 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: 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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widget.onSelectionHandleChanged(newSelection);
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}
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void _handleTap() {
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if (widget.onSelectionHandleTapped != null)
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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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widget.renderObject.getEndpointsForSelection(widget.selection);
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Offset point = null;
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LayerLink layerLink = null;
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TextSelectionHandleType type = TextSelectionHandleType.left;
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switch (widget.position) {
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case _TextSelectionHandlePosition.start:
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layerLink = widget.startHandleLayerLink;
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type = _chooseType(
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widget.renderObject.textDirection,
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TextSelectionHandleType.left,
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TextSelectionHandleType.right
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);
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break;
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case _TextSelectionHandlePosition.end:
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D.assert(!widget.selection.isCollapsed);
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layerLink = widget.endHandleLayerLink;
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type = _chooseType(
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widget.renderObject.textDirection,
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TextSelectionHandleType.right,
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TextSelectionHandleType.left
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);
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break;
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}
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Offset handleAnchor = widget.selectionControls.getHandleAnchor(
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type,
|
|
widget.renderObject.preferredLineHeight
|
|
);
|
|
Size handleSize = widget.selectionControls.getHandleSize(
|
|
widget.renderObject.preferredLineHeight
|
|
);
|
|
|
|
Rect handleRect = Rect.fromLTWH(
|
|
-handleAnchor.dx,
|
|
-handleAnchor.dy,
|
|
handleSize.width,
|
|
handleSize.height
|
|
);
|
|
|
|
Rect interactiveRect = handleRect.expandToInclude(
|
|
Rect.fromCircle(center: handleRect.center, radius: kMinInteractiveDimension/ 2)
|
|
);
|
|
RelativeRect padding = RelativeRect.fromLTRB(
|
|
Mathf.Max((interactiveRect.width - handleRect.width) / 2, 0),
|
|
Mathf.Max((interactiveRect.height - handleRect.height) / 2, 0),
|
|
Mathf.Max((interactiveRect.width - handleRect.width) / 2, 0),
|
|
Mathf.Max((interactiveRect.height - handleRect.height) / 2, 0)
|
|
);
|
|
|
|
return new CompositedTransformFollower(
|
|
link: layerLink,
|
|
offset: interactiveRect.topLeft,
|
|
showWhenUnlinked: false,
|
|
child: new FadeTransition(
|
|
opacity: _opacity,
|
|
child: new GestureDetector(
|
|
behavior: HitTestBehavior.translucent,
|
|
dragStartBehavior: widget.dragStartBehavior,
|
|
onPanStart: _handleDragStart,
|
|
onPanUpdate: _handleDragUpdate,
|
|
onTap: _handleTap,
|
|
child: new Padding(
|
|
padding: EdgeInsets.only(
|
|
left: padding.left,
|
|
top: padding.top,
|
|
right: padding.right,
|
|
bottom: padding.bottom
|
|
),
|
|
child: widget.selectionControls.buildHandle(context, type,
|
|
widget.renderObject.preferredLineHeight)
|
|
)
|
|
)
|
|
)
|
|
);
|
|
}
|
|
|
|
TextSelectionHandleType _chooseType(
|
|
TextDirection? textDirection,
|
|
TextSelectionHandleType ltrType,
|
|
TextSelectionHandleType rtlType
|
|
) {
|
|
if (widget.selection.isCollapsed) {
|
|
return TextSelectionHandleType.collapsed;
|
|
}
|
|
|
|
D.assert(textDirection != null);
|
|
switch (textDirection) {
|
|
case TextDirection.ltr:
|
|
return ltrType;
|
|
case TextDirection.rtl:
|
|
return rtlType;
|
|
}
|
|
|
|
D.assert(() => throw new UIWidgetsError($"invalid endpoint.direction {textDirection}"));
|
|
return ltrType;
|
|
}
|
|
}
|
|
public class TextSelectionGestureDetectorBuilder {
|
|
public TextSelectionGestureDetectorBuilder(TextSelectionGestureDetectorBuilderDelegate _delegate = null ) {
|
|
D.assert(_delegate != null);
|
|
this._delegate = _delegate;
|
|
}
|
|
|
|
protected readonly TextSelectionGestureDetectorBuilderDelegate _delegate;
|
|
|
|
public bool shouldShowSelectionToolbar {
|
|
get { return _shouldShowSelectionToolbar; }
|
|
}
|
|
bool _shouldShowSelectionToolbar = true;
|
|
|
|
protected EditableTextState editableText {
|
|
get { return _delegate.editableTextKey.currentState; }
|
|
}
|
|
protected RenderEditable renderEditable {
|
|
get { return editableText.renderEditable; }
|
|
}
|
|
protected void onTapDown(TapDownDetails details) {
|
|
renderEditable.handleTapDown(details);
|
|
PointerDeviceKind kind = details.kind;
|
|
_shouldShowSelectionToolbar = kind == null
|
|
|| kind == PointerDeviceKind.touch
|
|
|| kind == PointerDeviceKind.stylus;
|
|
}
|
|
protected virtual void onForcePressStart(ForcePressDetails details) {
|
|
D.assert(_delegate.forcePressEnabled);
|
|
_shouldShowSelectionToolbar = true;
|
|
if (_delegate.selectionEnabled) {
|
|
renderEditable.selectWordsInRange(
|
|
from: details.globalPosition,
|
|
cause: SelectionChangedCause.forcePress
|
|
);
|
|
}
|
|
}
|
|
protected virtual void onForcePressEnd(ForcePressDetails details) {
|
|
D.assert(_delegate.forcePressEnabled);
|
|
renderEditable.selectWordsInRange(
|
|
from: details.globalPosition,
|
|
cause: SelectionChangedCause.forcePress
|
|
);
|
|
if (shouldShowSelectionToolbar)
|
|
editableText.showToolbar();
|
|
}
|
|
protected virtual void onSingleTapUp(TapUpDetails details) {
|
|
if (_delegate.selectionEnabled) {
|
|
renderEditable.selectWordEdge(cause: SelectionChangedCause.tap);
|
|
}
|
|
}
|
|
protected void onSingleTapCancel() {/* Subclass should override this method if needed. */}
|
|
protected virtual void onSingleLongTapStart(LongPressStartDetails details) {
|
|
if (_delegate.selectionEnabled) {
|
|
renderEditable.selectPositionAt(
|
|
from: details.globalPosition,
|
|
cause: SelectionChangedCause.longPress
|
|
);
|
|
}
|
|
}
|
|
protected virtual void onSingleLongTapMoveUpdate(LongPressMoveUpdateDetails details) {
|
|
if (_delegate.selectionEnabled) {
|
|
renderEditable.selectPositionAt(
|
|
from: details.globalPosition,
|
|
cause: SelectionChangedCause.longPress
|
|
);
|
|
}
|
|
}
|
|
|
|
protected void onSingleLongTapEnd(LongPressEndDetails details) {
|
|
if (shouldShowSelectionToolbar)
|
|
editableText.showToolbar();
|
|
}
|
|
|
|
protected void onDoubleTapDown(TapDownDetails details) {
|
|
if (_delegate.selectionEnabled) {
|
|
renderEditable.selectWord(cause: SelectionChangedCause.tap);
|
|
if (shouldShowSelectionToolbar)
|
|
editableText.showToolbar();
|
|
}
|
|
}
|
|
|
|
protected void onDragSelectionStart(DragStartDetails details) {
|
|
renderEditable.selectPositionAt(
|
|
from: details.globalPosition,
|
|
cause: SelectionChangedCause.drag
|
|
);
|
|
}
|
|
|
|
|
|
protected void onDragSelectionUpdate(DragStartDetails startDetails, DragUpdateDetails updateDetails) {
|
|
renderEditable.selectPositionAt(
|
|
from: startDetails.globalPosition,
|
|
to: updateDetails.globalPosition,
|
|
cause: SelectionChangedCause.drag
|
|
);
|
|
}
|
|
|
|
protected virtual void onDragSelectionEnd(DragEndDetails details)
|
|
{/* Subclass should override this method if needed. */}
|
|
|
|
public Widget buildGestureDetector(
|
|
Key key = null,
|
|
HitTestBehavior behavior = default,
|
|
Widget child = null) {
|
|
GestureForcePressStartCallback PressStart = null;
|
|
GestureForcePressEndCallback PressEnd = null;
|
|
if (_delegate.forcePressEnabled) {
|
|
PressStart = onForcePressStart;
|
|
PressEnd = onForcePressEnd;
|
|
}
|
|
return new TextSelectionGestureDetector(
|
|
key: key,
|
|
onTapDown: onTapDown,
|
|
onForcePressStart:PressStart,
|
|
onForcePressEnd:PressEnd,
|
|
onSingleTapUp: onSingleTapUp,
|
|
onSingleTapCancel: onSingleTapCancel,
|
|
onSingleLongTapStart: onSingleLongTapStart,
|
|
onSingleLongTapMoveUpdate: onSingleLongTapMoveUpdate,
|
|
onSingleLongTapEnd: onSingleLongTapEnd,
|
|
onDoubleTapDown: onDoubleTapDown,
|
|
onDragSelectionStart: onDragSelectionStart,
|
|
onDragSelectionUpdate: onDragSelectionUpdate,
|
|
onDragSelectionEnd: onDragSelectionEnd,
|
|
behavior: behavior,
|
|
child: child
|
|
);
|
|
}
|
|
}
|
|
/*public abstract class TextSelectionGestureDetectorBuilderDelegate {
|
|
|
|
public GlobalKey<EditableTextState> editableTextKey { get; }
|
|
public bool forcePressEnabled {
|
|
get;
|
|
}
|
|
public bool selectionEnabled { get; }
|
|
}*/
|
|
|
|
public interface TextSelectionGestureDetectorBuilderDelegate {
|
|
|
|
GlobalKey<EditableTextState> editableTextKey { get; }
|
|
bool forcePressEnabled {
|
|
get;
|
|
}
|
|
bool selectionEnabled { get; }
|
|
}
|
|
|
|
public class TextSelectionGestureDetector : StatefulWidget {
|
|
public TextSelectionGestureDetector(
|
|
Key key = null,
|
|
GestureTapDownCallback onTapDown = null,
|
|
GestureForcePressStartCallback onForcePressStart = null,
|
|
GestureForcePressEndCallback onForcePressEnd = null,
|
|
GestureTapUpCallback onSingleTapUp = null,
|
|
GestureTapCancelCallback onSingleTapCancel = null,
|
|
GestureLongPressStartCallback onSingleLongTapStart = null,
|
|
GestureLongPressMoveUpdateCallback onSingleLongTapMoveUpdate = null,
|
|
GestureLongPressEndCallback onSingleLongTapEnd = null,
|
|
GestureTapDownCallback onDoubleTapDown = null,
|
|
GestureDragStartCallback onDragSelectionStart = null,
|
|
DragSelectionUpdateCallback onDragSelectionUpdate = null,
|
|
GestureDragEndCallback onDragSelectionEnd = null,
|
|
HitTestBehavior? behavior = null,
|
|
Widget child = null
|
|
) : base(key: key) {
|
|
D.assert(child != null);
|
|
this.onTapDown = onTapDown;
|
|
this.onForcePressEnd = onForcePressEnd;
|
|
this.onForcePressStart = onForcePressStart;
|
|
this.onSingleTapUp = onSingleTapUp;
|
|
this.onSingleTapCancel = onSingleTapCancel;
|
|
this.onSingleLongTapStart = onSingleLongTapStart;
|
|
this.onDoubleTapDown = onDoubleTapDown;
|
|
this.onDragSelectionStart = onDragSelectionStart;
|
|
this.onDragSelectionUpdate = onDragSelectionUpdate;
|
|
this.onDragSelectionEnd = onDragSelectionEnd;
|
|
this.behavior = behavior;
|
|
this.child = child;
|
|
}
|
|
|
|
public readonly GestureTapDownCallback onTapDown;
|
|
|
|
public readonly GestureForcePressStartCallback onForcePressStart;
|
|
|
|
public readonly GestureForcePressEndCallback onForcePressEnd;
|
|
|
|
public readonly GestureTapUpCallback onSingleTapUp;
|
|
|
|
public readonly GestureTapCancelCallback onSingleTapCancel;
|
|
|
|
public readonly GestureLongPressStartCallback onSingleLongTapStart;
|
|
|
|
public readonly GestureLongPressMoveUpdateCallback onSingleLongTapMoveUpdate;
|
|
|
|
public readonly GestureLongPressEndCallback onSingleLongTapEnd;
|
|
|
|
public readonly GestureTapDownCallback onDoubleTapDown;
|
|
|
|
public readonly GestureDragStartCallback onDragSelectionStart;
|
|
|
|
public readonly DragSelectionUpdateCallback onDragSelectionUpdate;
|
|
|
|
public readonly GestureDragEndCallback onDragSelectionEnd;
|
|
|
|
public HitTestBehavior? behavior;
|
|
|
|
public readonly Widget child;
|
|
|
|
public override State createState() {
|
|
return new _TextSelectionGestureDetectorState();
|
|
}
|
|
}
|
|
|
|
class _TextSelectionGestureDetectorState : State<TextSelectionGestureDetector> {
|
|
Timer _doubleTapTimer;
|
|
Offset _lastTapOffset;
|
|
|
|
bool _isDoubleTap = false;
|
|
|
|
public override void dispose() {
|
|
_doubleTapTimer?.cancel();
|
|
_dragUpdateThrottleTimer?.cancel();
|
|
base.dispose();
|
|
}
|
|
|
|
void _handleTapDown(TapDownDetails details) {
|
|
if (widget.onTapDown != null) {
|
|
widget.onTapDown(details);
|
|
}
|
|
|
|
if (_doubleTapTimer != null &&
|
|
_isWithinDoubleTapTolerance(details.globalPosition)) {
|
|
if (widget.onDoubleTapDown != null) {
|
|
widget.onDoubleTapDown(details);
|
|
}
|
|
|
|
_doubleTapTimer.cancel();
|
|
_doubleTapTimeout();
|
|
_isDoubleTap = true;
|
|
}
|
|
}
|
|
|
|
void _handleTapUp(TapUpDetails details) {
|
|
if (!_isDoubleTap) {
|
|
if (widget.onSingleTapUp != null) {
|
|
widget.onSingleTapUp(details);
|
|
}
|
|
|
|
_lastTapOffset = details.globalPosition;
|
|
_doubleTapTimer = Timer.create(Constants.kDoubleTapTimeout, _doubleTapTimeout);
|
|
}
|
|
|
|
_isDoubleTap = false;
|
|
}
|
|
|
|
void _handleTapCancel() {
|
|
if (widget.onSingleTapCancel != null) {
|
|
widget.onSingleTapCancel();
|
|
}
|
|
}
|
|
|
|
DragStartDetails _lastDragStartDetails;
|
|
DragUpdateDetails _lastDragUpdateDetails;
|
|
Timer _dragUpdateThrottleTimer;
|
|
|
|
void _handleDragStart(DragStartDetails details) {
|
|
D.assert(_lastDragStartDetails == null);
|
|
_lastDragStartDetails = details;
|
|
if (widget.onDragSelectionStart != null) {
|
|
widget.onDragSelectionStart(details);
|
|
}
|
|
}
|
|
|
|
void _handleDragUpdate(DragUpdateDetails details) {
|
|
_lastDragUpdateDetails = details;
|
|
_dragUpdateThrottleTimer =
|
|
_dragUpdateThrottleTimer ?? Timer.create(TextSelectionUtils._kDragSelectionUpdateThrottle, _handleDragUpdateThrottled);
|
|
}
|
|
|
|
object _handleDragUpdateThrottled() {
|
|
D.assert(_lastDragStartDetails != null);
|
|
D.assert(_lastDragUpdateDetails != null);
|
|
if (widget.onDragSelectionUpdate != null) {
|
|
widget.onDragSelectionUpdate(_lastDragStartDetails, _lastDragUpdateDetails);
|
|
}
|
|
|
|
_dragUpdateThrottleTimer = null;
|
|
_lastDragUpdateDetails = null;
|
|
return null;
|
|
}
|
|
|
|
void _handleDragEnd(DragEndDetails details) {
|
|
D.assert(_lastDragStartDetails != null);
|
|
if (_lastDragUpdateDetails != null) {
|
|
_dragUpdateThrottleTimer.cancel();
|
|
_handleDragUpdateThrottled();
|
|
}
|
|
|
|
if (widget.onDragSelectionEnd != null) {
|
|
widget.onDragSelectionEnd(details);
|
|
}
|
|
|
|
_dragUpdateThrottleTimer = null;
|
|
_lastDragStartDetails = null;
|
|
_lastDragUpdateDetails = null;
|
|
}
|
|
|
|
void _forcePressStarted(ForcePressDetails details) {
|
|
_doubleTapTimer?.cancel();
|
|
_doubleTapTimer = null;
|
|
if (widget.onForcePressStart != null)
|
|
widget.onForcePressStart(details);
|
|
}
|
|
|
|
void _forcePressEnded(ForcePressDetails details) {
|
|
if (widget.onForcePressEnd != null)
|
|
widget.onForcePressEnd(details);
|
|
}
|
|
void _handleLongPressStart(LongPressStartDetails details) {
|
|
if (!_isDoubleTap && widget.onSingleLongTapStart != null) {
|
|
widget.onSingleLongTapStart(details);
|
|
}
|
|
}
|
|
|
|
void _handleLongPressMoveUpdate(LongPressMoveUpdateDetails details) {
|
|
if (!_isDoubleTap && widget.onSingleLongTapMoveUpdate != null) {
|
|
widget.onSingleLongTapMoveUpdate(details);
|
|
}
|
|
}
|
|
|
|
void _handleLongPressEnd(LongPressEndDetails details) {
|
|
if (!_isDoubleTap && widget.onSingleLongTapEnd != null) {
|
|
widget.onSingleLongTapEnd(details);
|
|
}
|
|
|
|
_isDoubleTap = false;
|
|
}
|
|
|
|
object _doubleTapTimeout() {
|
|
_doubleTapTimer = null;
|
|
_lastTapOffset = null;
|
|
return null;
|
|
}
|
|
|
|
bool _isWithinDoubleTapTolerance(Offset secondTapOffset) {
|
|
D.assert(secondTapOffset != null);
|
|
if (_lastTapOffset == null) {
|
|
return false;
|
|
}
|
|
|
|
Offset difference = secondTapOffset - _lastTapOffset;
|
|
return difference.distance <= Constants.kDoubleTapSlop;
|
|
}
|
|
|
|
public override Widget build(BuildContext context) {
|
|
Dictionary<Type, GestureRecognizerFactory> gestures = new Dictionary<Type, GestureRecognizerFactory>();
|
|
|
|
gestures.Add(typeof(_TransparentTapGestureRecognizer), new GestureRecognizerFactoryWithHandlers<_TransparentTapGestureRecognizer>(
|
|
() => new _TransparentTapGestureRecognizer(debugOwner: this),
|
|
(_TransparentTapGestureRecognizer instance) => {
|
|
instance.onTapDown = _handleTapDown;
|
|
instance.onTapUp = _handleTapUp;
|
|
instance.onTapCancel = _handleTapCancel;
|
|
}
|
|
)
|
|
);
|
|
|
|
if (widget.onSingleLongTapStart != null ||
|
|
widget.onSingleLongTapMoveUpdate != null ||
|
|
widget.onSingleLongTapEnd != null
|
|
) {
|
|
gestures[typeof(LongPressGestureRecognizer)] =
|
|
new GestureRecognizerFactoryWithHandlers<LongPressGestureRecognizer>(
|
|
() => new LongPressGestureRecognizer(debugOwner: this, kind: PointerDeviceKind.touch),
|
|
instance => {
|
|
instance.onLongPressStart = _handleLongPressStart;
|
|
instance.onLongPressMoveUpdate = _handleLongPressMoveUpdate;
|
|
instance.onLongPressEnd = _handleLongPressEnd;
|
|
});
|
|
}
|
|
|
|
if (widget.onDragSelectionStart != null ||
|
|
widget.onDragSelectionUpdate != null ||
|
|
widget.onDragSelectionEnd != null) {
|
|
gestures.Add(typeof(HorizontalDragGestureRecognizer),
|
|
new GestureRecognizerFactoryWithHandlers<HorizontalDragGestureRecognizer>(
|
|
() => new HorizontalDragGestureRecognizer(debugOwner: this, kind: PointerDeviceKind.mouse),
|
|
instance => {
|
|
instance.dragStartBehavior = DragStartBehavior.down;
|
|
instance.onStart = _handleDragStart;
|
|
instance.onUpdate = _handleDragUpdate;
|
|
instance.onEnd = _handleDragEnd;
|
|
}
|
|
)
|
|
);
|
|
}
|
|
|
|
if (widget.onForcePressStart != null || widget.onForcePressEnd != null) {
|
|
GestureForcePressStartCallback startInstance = null;
|
|
if (widget.onForcePressStart != null)
|
|
startInstance = _forcePressStarted;
|
|
GestureForcePressEndCallback endInstance = null;
|
|
if (widget.onForcePressEnd != null)
|
|
endInstance = _forcePressEnded;
|
|
gestures[typeof(ForcePressGestureRecognizer)] = new GestureRecognizerFactoryWithHandlers<ForcePressGestureRecognizer>(
|
|
() => new ForcePressGestureRecognizer(debugOwner: this),
|
|
(ForcePressGestureRecognizer instance) => {
|
|
instance.onStart = startInstance;
|
|
instance.onEnd = endInstance;
|
|
}
|
|
);
|
|
}
|
|
|
|
return new RawGestureDetector(
|
|
gestures: gestures,
|
|
behavior: widget.behavior,
|
|
child: widget.child
|
|
);
|
|
}
|
|
}
|
|
public class _TransparentTapGestureRecognizer : TapGestureRecognizer {
|
|
public _TransparentTapGestureRecognizer(Object debugOwner = default) : base(debugOwner: debugOwner) {}
|
|
|
|
public override void rejectGesture(int pointer) {
|
|
if (state == GestureRecognizerState.ready) {
|
|
acceptGesture(pointer);
|
|
} else {
|
|
base.rejectGesture(pointer);
|
|
}
|
|
}
|
|
}
|
|
}
|