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;
}
internal _TextSelectionHandleOverlay(
Key key = null,
TextSelection selection = null,
_TextSelectionHandlePosition position = _TextSelectionHandlePosition.start,
LayerLink layerLink = null,
RenderEditable renderObject = null,
ValueChanged <TextSelection> onSelectionHandleChanged = null,
VoidCallback onSelectionHandleTapped = null,
TextSelectionControls selectionControls = null
) : base(key: key)
{
this.selection = selection;
this.position = position;
this.layerLink = layerLink;
this.renderObject = renderObject;
this.onSelectionHandleChanged = onSelectionHandleChanged;
this.onSelectionHandleTapped = onSelectionHandleTapped;
this.selectionControls = selectionControls;
}
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);
}
internal _TextSelectionHandleOverlay(
Key key = null,
TextSelection selection = null,
_TextSelectionHandlePosition position = _TextSelectionHandlePosition.start,
LayerLink startHandleLayerLink = null,
LayerLink endHandleLayerLink = null,
RenderEditable renderObject = null,
ValueChanged <TextSelection> onSelectionHandleChanged = null,
VoidCallback onSelectionHandleTapped = null,
TextSelectionControls selectionControls = null,
DragStartBehavior dragStartBehavior = DragStartBehavior.start
) : base(key: key)
{
this.selection = selection;
this.position = position;
this.startHandleLayerLink = startHandleLayerLink;
this.endHandleLayerLink = endHandleLayerLink;
this.renderObject = renderObject;
this.onSelectionHandleChanged = onSelectionHandleChanged;
this.onSelectionHandleTapped = onSelectionHandleTapped;
this.selectionControls = selectionControls;
this.dragStartBehavior = dragStartBehavior;
}
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;
}
void _handleSelectionChanged(TextSelection selection, RenderEditable renderObject,
SelectionChangedCause cause)
{
this.widget.controller.selection = selection;
this.requestKeyboard();
this._hideSelectionOverlayIfNeeded();
if (this.widget.selectionControls != null)
{
this._selectionOverlay = new TextSelectionOverlay(
context: this.context,
value: this._value,
debugRequiredFor: this.widget,
layerLink: this._layerLink,
renderObject: renderObject,
selectionControls: this.widget.selectionControls,
selectionDelegate: this
);
bool longPress = cause == SelectionChangedCause.longPress;
if (cause != SelectionChangedCause.keyboard && (this._value.text.isNotEmpty() || longPress))
{
this._selectionOverlay.showHandles();
}
if (longPress || cause == SelectionChangedCause.doubleTap)
{
this._selectionOverlay.showToolbar();
}
}
if (this.widget.onSelectionChanged != null)
{
this.widget.onSelectionChanged(selection, cause);
}
}