Widget _buildHandle(BuildContext context, _TextSelectionHandlePosition position)
{
if ((_selection.isCollapsed && position == _TextSelectionHandlePosition.end) ||
selectionControls == null)
{
return(new Container()); // hide the second handle when collapsed
}
return(new Visibility(
visible: handlesVisible,
child: new _TextSelectionHandleOverlay(
onSelectionHandleChanged: (TextSelection newSelection) => {
_handleSelectionHandleChanged(newSelection, position);
},
onSelectionHandleTapped: onSelectionHandleTapped,
startHandleLayerLink: startHandleLayerLink,
endHandleLayerLink: endHandleLayerLink,
renderObject: renderObject,
selection: _selection,
selectionControls: selectionControls,
position: position,
dragStartBehavior: dragStartBehavior
)
));
}
void _handleSelectionHandleChanged(TextSelection newSelection, _TextSelectionHandlePosition position)
{
TextPosition textPosition = null;
switch (position)
{
case _TextSelectionHandlePosition.start:
textPosition = newSelection.basePos;
break;
case _TextSelectionHandlePosition.end:
textPosition = newSelection.extendPos;
break;
}
this.selectionDelegate.textEditingValue =
this._value.copyWith(selection: newSelection, composing: TextRange.empty);
this.selectionDelegate.bringIntoView(textPosition);
}
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;
}
Widget _buildHandle(BuildContext context, _TextSelectionHandlePosition position)
{
if ((this._selection.isCollapsed && position == _TextSelectionHandlePosition.end) ||
this.selectionControls == null)
{
return(new Container()); // hide the second handle when collapsed
}
return(new _TextSelectionHandleOverlay(
onSelectionHandleChanged: (TextSelection newSelection) => {
this._handleSelectionHandleChanged(newSelection, position);
},
onSelectionHandleTapped: this._handleSelectionHandleTapped,
layerLink: this.layerLink,
renderObject: this.renderObject,
selection: this._selection,
selectionControls: this.selectionControls,
position: position,
dragStartBehavior: this.dragStartBehavior
));
}
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;
}