public override Widget build(BuildContext context)
{
return(new Expanded(
flex: flex,
child: SizedBox.shrink()
));
}
public Visibility(
Key key = null,
Widget child = null,
Widget replacement = null,
bool visible = true,
bool maintainState = false,
bool maintainAnimation = false,
bool maintainSize = false,
bool maintainInteractivity = false
) : base(key: key)
{
D.assert(child != null);
D.assert(maintainState == true || maintainAnimation == false,
() => "Cannot maintain animations if the state is not also maintained.");
D.assert(maintainAnimation == true || maintainSize == false,
() => "Cannot maintain size if animations are not maintained.");
D.assert(maintainSize == true || maintainInteractivity == false,
() => "Cannot maintain interactivity if size is not maintained.");
this.replacement = replacement ?? SizedBox.shrink();
this.child = child;
this.visible = visible;
this.maintainState = maintainState;
this.maintainAnimation = maintainAnimation;
this.maintainSize = maintainSize;
this.maintainInteractivity = maintainInteractivity;
}
Widget _buildDrawer(BuildContext context)
{
bool drawerIsStart = widget.alignment == DrawerAlignment.start;
EdgeInsets padding = MediaQuery.of(context).padding;
TextDirection textDirection = Directionality.of(context);
float?dragAreaWidth = widget.edgeDragWidth;
if (widget.edgeDragWidth == null)
{
switch (textDirection)
{
case TextDirection.ltr:
dragAreaWidth = DrawerUtils._kEdgeDragWidth +
(drawerIsStart ? padding.left : padding.right);
break;
case TextDirection.rtl:
dragAreaWidth = DrawerUtils._kEdgeDragWidth +
(drawerIsStart ? padding.right : padding.left);
break;
}
}
if (_controller.status == AnimationStatus.dismissed)
{
if (widget.enableOpenDragGesture ?? false)
{
return(new Align(
alignment: _drawerOuterAlignment,
child: new GestureDetector(
key: _gestureDetectorKey,
onHorizontalDragUpdate: _move,
onHorizontalDragEnd: _settle,
behavior: HitTestBehavior.translucent,
dragStartBehavior: widget.dragStartBehavior ?? DragStartBehavior.down,
child: new Container(width: dragAreaWidth)
)
));
}
else
{
return(SizedBox.shrink());
}
}
else
{
bool?platformHasBackButton = null;
switch (Theme.of(context).platform)
{
case RuntimePlatform.Android:
platformHasBackButton = true;
break;
case RuntimePlatform.IPhonePlayer:
case RuntimePlatform.OSXEditor:
case RuntimePlatform.OSXPlayer:
case RuntimePlatform.LinuxEditor:
case RuntimePlatform.LinuxPlayer:
case RuntimePlatform.WindowsEditor:
case RuntimePlatform.WindowsPlayer:
platformHasBackButton = false;
break;
}
D.assert(platformHasBackButton != null);
return(new GestureDetector(
key: _gestureDetectorKey,
onHorizontalDragDown: _handleDragDown,
onHorizontalDragUpdate: _move,
onHorizontalDragEnd: _settle,
onHorizontalDragCancel: _handleDragCancel,
dragStartBehavior: widget.dragStartBehavior ?? DragStartBehavior.down,
child: new RepaintBoundary(
child: new Stack(
children: new List <Widget> {
new GestureDetector(
onTap: close,
child: new MouseRegion(
opaque: true,
child: new Container( // The drawer's "scrim"
color: _scrimColorTween.evaluate(_controller)
)
)
),
new Align(
alignment: _drawerOuterAlignment,
child: new Align(
alignment: _drawerInnerAlignment,
widthFactor: _controller.value,
child: new RepaintBoundary(
child: new FocusScope(
key: _drawerKey,
node: _focusScopeNode,
child: widget.child
)
)
)
)
}
)
)
));
}
}