public TextSelectionOverlay(TextEditingValue value = null,
BuildContext context = null, Widget debugRequiredFor = null,
LayerLink layerLink = null,
RenderEditable renderObject = null,
TextSelectionControls selectionControls = null,
TextSelectionDelegate selectionDelegate = null,
DragStartBehavior dragStartBehavior = DragStartBehavior.start)
{
D.assert(value != null);
D.assert(context != null);
this.context = context;
this.debugRequiredFor = debugRequiredFor;
this.layerLink = layerLink;
this.renderObject = renderObject;
this.selectionControls = selectionControls;
this.selectionDelegate = selectionDelegate;
this._value = value;
OverlayState overlay = Overlay.of(context);
D.assert(overlay != null, () => $"No Overlay widget exists above {context}.\n" +
"Usually the Navigator created by WidgetsApp provides the overlay. Perhaps your " +
"app content was created above the Navigator with the WidgetsApp builder parameter.");
this._toolbarController = new AnimationController(duration: fadeDuration, vsync: overlay);
this.dragStartBehavior = dragStartBehavior;
}
public void showToolbar()
{
D.assert(this._toolbar == null);
this._toolbar = new OverlayEntry(builder: this._buildToolbar);
Overlay.of(this.context, debugRequiredFor: this.debugRequiredFor).insert(this._toolbar);
this._toolbarController.forward(from: 0.0f);
}
public void showToolbar()
{
D.assert(_toolbar == null);
_toolbar = new OverlayEntry(builder: _buildToolbar);
Overlay.of(context, rootOverlay: true, debugRequiredFor: debugRequiredFor).insert(_toolbar);
_toolbarController.forward(from: 0.0f);
}
public void showHandles()
{
D.assert(_handles == null);
_handles = new List <OverlayEntry> {
new OverlayEntry(builder: (BuildContext context) =>
_buildHandle(context, _TextSelectionHandlePosition.start)),
new OverlayEntry(builder: (BuildContext context) =>
_buildHandle(context, _TextSelectionHandlePosition.end)),
};
Overlay.of(this.context, rootOverlay: true, debugRequiredFor: debugRequiredFor).insertAll(_handles);
}
public void showHandles()
{
D.assert(this._handles == null);
this._handles = new List <OverlayEntry> {
new OverlayEntry(builder: (BuildContext context) =>
this._buildHandle(context, _TextSelectionHandlePosition.start)),
new OverlayEntry(builder: (BuildContext context) =>
this._buildHandle(context, _TextSelectionHandlePosition.end)),
};
Overlay.of(this.context, debugRequiredFor: this.debugRequiredFor).insertAll(this._handles);
this._handleController.forward(from: 0.0f);
}
public override Widget build(BuildContext context)
{
D.assert(Overlay.of(context, debugRequiredFor: this.widget) != null);
bool canDrag = this.widget.maxSimultaneousDrags == null ||
this._activeCount < this.widget.maxSimultaneousDrags;
bool showChild = this._activeCount == 0 || this.widget.childWhenDragging == null;
if (canDrag)
{
return(new Listener(
onPointerDown: this._routePointer,
child: showChild ? this.widget.child : this.widget.childWhenDragging
));
}
return(new Listener(
child: showChild ? this.widget.child : this.widget.childWhenDragging));
}
public TextSelectionOverlay(TextEditingValue value = null,
BuildContext context = null, Widget debugRequiredFor = null,
LayerLink layerLink = null,
RenderEditable renderObject = null,
TextSelectionControls selectionControls = null,
TextSelectionDelegate selectionDelegate = null)
{
D.assert(value != null);
D.assert(context != null);
this.context = context;
this.debugRequiredFor = debugRequiredFor;
this.layerLink = layerLink;
this.renderObject = renderObject;
this.selectionControls = selectionControls;
this.selectionDelegate = selectionDelegate;
this._value = value;
OverlayState overlay = Overlay.of(context);
D.assert(overlay != null);
this._handleController = new AnimationController(duration: _fadeDuration, vsync: overlay);
this._toolbarController = new AnimationController(duration: _fadeDuration, vsync: overlay);
}
public TextSelectionOverlay(
TextEditingValue value = null,
BuildContext context = null,
Widget debugRequiredFor = null,
LayerLink toolbarLayerLink = null,
LayerLink startHandleLayerLink = null,
LayerLink endHandleLayerLink = null,
RenderEditable renderObject = null,
TextSelectionControls selectionControls = null,
bool?handlesVisible = false,
TextSelectionDelegate selectionDelegate = null,
DragStartBehavior dragStartBehavior = DragStartBehavior.start,
VoidCallback onSelectionHandleTapped = null)
{
D.assert(value != null);
D.assert(context != null);
D.assert(handlesVisible != null);
_handlesVisible = handlesVisible.Value;
this.context = context;
this.debugRequiredFor = debugRequiredFor;
this.toolbarLayerLink = toolbarLayerLink;
this.startHandleLayerLink = startHandleLayerLink;
this.endHandleLayerLink = endHandleLayerLink;
this.renderObject = renderObject;
this.selectionControls = selectionControls;
this.selectionDelegate = selectionDelegate;
this.onSelectionHandleTapped = onSelectionHandleTapped;
_value = value;
OverlayState overlay = Overlay.of(context, rootOverlay: true);
D.assert(overlay != null, () => $"No Overlay widget exists above {context}.\n" +
"Usually the Navigator created by WidgetsApp provides the overlay. Perhaps your " +
"app content was created above the Navigator with the WidgetsApp builder parameter.");
_toolbarController = new AnimationController(duration: fadeDuration, vsync: overlay);
this.dragStartBehavior = dragStartBehavior;
}
_DragAvatar <T> _startDrag(Offset position)
{
if (this.widget.maxSimultaneousDrags != null &&
this._activeCount >= this.widget.maxSimultaneousDrags)
{
return(null);
}
var dragStartPoint = Offset.zero;
switch (this.widget.dragAnchor)
{
case DragAnchor.child:
RenderBox renderObject = this.context.findRenderObject() as RenderBox;
dragStartPoint = renderObject.globalToLocal(position);
break;
case DragAnchor.pointer:
dragStartPoint = Offset.zero;
break;
}
this.setState(() => { this._activeCount += 1; });
_DragAvatar <T> avatar = new _DragAvatar <T>(
overlayState: Overlay.of(this.context, debugRequiredFor: this.widget),
data: this.widget.data,
axis: this.widget.axis,
initialPosition: position,
dragStartPoint: dragStartPoint,
feedback: this.widget.feedback,
feedbackOffset: this.widget.feedbackOffset,
onDragEnd: (Velocity velocity, Offset offset, bool wasAccepted) => {
if (this.mounted)
{
this.setState(() => { this._activeCount -= 1; });
}
else
{
this._activeCount -= 1;
this._disposeRecognizerIfInactive();
}
if (this.mounted && this.widget.onDragEnd != null)
{
this.widget.onDragEnd(new DraggableDetails(
wasAccepted: wasAccepted,
velocity: velocity,
offset: offset
));
}
if (wasAccepted && this.widget.onDragCompleted != null)
{
this.widget.onDragCompleted();
}
if (!wasAccepted && this.widget.onDraggableCanceled != null)
{
this.widget.onDraggableCanceled(velocity, offset);
}
}
);
if (this.widget.onDragStarted != null)
{
this.widget.onDragStarted();
}
return(avatar);
}
