public GestureDetector(
Key key = null,
Widget child = null,
GestureTapDownCallback onTapDown = null,
GestureTapUpCallback onTapUp = null,
GestureTapCallback onTap = null,
GestureTapCancelCallback onTapCancel = null,
GestureDoubleTapCallback onDoubleTap = null,
GestureLongPressCallback onLongPress = null,
GestureLongPressUpCallback onLongPressUp = null,
GestureLongPressDragStartCallback onLongPressDragStart = null,
GestureLongPressDragUpdateCallback onLongPressDragUpdate = null,
GestureLongPressDragUpCallback onLongPressDragUp = null,
GestureDragDownCallback onVerticalDragDown = null,
GestureDragStartCallback onVerticalDragStart = null,
GestureDragUpdateCallback onVerticalDragUpdate = null,
GestureDragEndCallback onVerticalDragEnd = null,
GestureDragCancelCallback onVerticalDragCancel = null,
GestureDragDownCallback onHorizontalDragDown = null,
GestureDragStartCallback onHorizontalDragStart = null,
GestureDragUpdateCallback onHorizontalDragUpdate = null,
GestureDragEndCallback onHorizontalDragEnd = null,
GestureDragCancelCallback onHorizontalDragCancel = null,
GestureDragDownCallback onPanDown = null,
GestureDragStartCallback onPanStart = null,
GestureDragUpdateCallback onPanUpdate = null,
GestureDragEndCallback onPanEnd = null,
GestureDragCancelCallback onPanCancel = null,
GestureScaleStartCallback onScaleStart = null,
GestureScaleUpdateCallback onScaleUpdate = null,
GestureScaleEndCallback onScaleEnd = null,
HitTestBehavior behavior = HitTestBehavior.deferToChild,
DragStartBehavior dragStartBehavior = DragStartBehavior.down
) : base(key)
{
D.assert(() => {
bool haveVerticalDrag =
onVerticalDragStart != null || onVerticalDragUpdate != null ||
onVerticalDragEnd != null;
bool haveHorizontalDrag =
onHorizontalDragStart != null || onHorizontalDragUpdate != null ||
onHorizontalDragEnd != null;
bool haveLongPress = onLongPress != null || onLongPressUp != null;
bool haveLongPressDrag = onLongPressDragStart != null || onLongPressDragUpdate != null ||
onLongPressDragUp != null;
bool havePan = onPanStart != null || onPanUpdate != null || onPanEnd != null;
bool haveScale = onScaleStart != null || onScaleUpdate != null || onScaleEnd != null;
if (havePan || haveScale)
{
if (havePan && haveScale)
{
throw new UIWidgetsError(
"Incorrect GestureDetector arguments.\n" +
"Having both a pan gesture recognizer and a scale gesture recognizer is redundant; scale is a superset of pan. Just use the scale gesture recognizer."
);
}
string recognizer = havePan ? "pan" : "scale";
if (haveVerticalDrag && haveHorizontalDrag)
{
throw new UIWidgetsError(
"Incorrect GestureDetector arguments.\n" +
$"Simultaneously having a vertical drag gesture recognizer, a horizontal drag gesture recognizer, and a {recognizer} gesture recognizer " +
$"will result in the {recognizer} gesture recognizer being ignored, since the other two will catch all drags."
);
}
}
if (haveLongPress && haveLongPressDrag)
{
throw new UIWidgetsError(
"Incorrect GestureDetector arguments.\n" +
"Having both a long press and a long press drag recognizer is " +
"redundant as the long press drag is a superset of long press. " +
"Except long press drag allows for drags after the long press is " +
"triggered."
);
}
return(true);
});
this.child = child;
this.onTapDown = onTapDown;
this.onTapUp = onTapUp;
this.onTap = onTap;
this.onTapCancel = onTapCancel;
this.onDoubleTap = onDoubleTap;
this.onLongPress = onLongPress;
this.onLongPressUp = onLongPressUp;
this.onLongPressDragStart = onLongPressDragStart;
this.onLongPressDragUpdate = onLongPressDragUpdate;
this.onLongPressDragUp = onLongPressDragUp;
this.onVerticalDragDown = onVerticalDragDown;
this.onVerticalDragStart = onVerticalDragStart;
this.onVerticalDragUpdate = onVerticalDragUpdate;
this.onVerticalDragEnd = onVerticalDragEnd;
this.onVerticalDragCancel = onVerticalDragCancel;
this.onHorizontalDragDown = onHorizontalDragDown;
this.onHorizontalDragStart = onHorizontalDragStart;
this.onHorizontalDragUpdate = onHorizontalDragUpdate;
this.onHorizontalDragEnd = onHorizontalDragEnd;
this.onHorizontalDragCancel = onHorizontalDragCancel;
this.onPanDown = onPanDown;
this.onPanStart = onPanStart;
this.onPanUpdate = onPanUpdate;
this.onPanEnd = onPanEnd;
this.onPanCancel = onPanCancel;
this.onScaleStart = onScaleStart;
this.onScaleUpdate = onScaleUpdate;
this.onScaleEnd = onScaleEnd;
this.behavior = behavior;
this.dragStartBehavior = dragStartBehavior;
}
public GestureDetector(
Key key = null,
Widget child = null,
GestureTapDownCallback onTapDown = null,
GestureTapUpCallback onTapUp = null,
GestureTapCallback onTap = null,
GestureTapCancelCallback onTapCancel = null,
GestureTapDownCallback onSecondaryTapDown = null,
GestureTapUpCallback onSecondaryTapUp = null,
GestureTapCancelCallback onSecondaryTapCancel = null,
GestureDoubleTapCallback onDoubleTap = null,
GestureLongPressCallback onLongPress = null,
GestureLongPressStartCallback onLongPressStart = null,
GestureLongPressMoveUpdateCallback onLongPressMoveUpdate = null,
GestureLongPressUpCallback onLongPressUp = null,
GestureLongPressEndCallback onLongPressEnd = null,
GestureDragDownCallback onVerticalDragDown = null,
GestureDragStartCallback onVerticalDragStart = null,
GestureDragUpdateCallback onVerticalDragUpdate = null,
GestureDragEndCallback onVerticalDragEnd = null,
GestureDragCancelCallback onVerticalDragCancel = null,
GestureDragDownCallback onHorizontalDragDown = null,
GestureDragStartCallback onHorizontalDragStart = null,
GestureDragUpdateCallback onHorizontalDragUpdate = null,
GestureDragEndCallback onHorizontalDragEnd = null,
GestureDragCancelCallback onHorizontalDragCancel = null,
GestureForcePressStartCallback onForcePressStart = null,
GestureForcePressPeakCallback onForcePressPeak = null,
GestureForcePressUpdateCallback onForcePressUpdate = null,
GestureForcePressEndCallback onForcePressEnd = null,
GestureDragDownCallback onPanDown = null,
GestureDragStartCallback onPanStart = null,
GestureDragUpdateCallback onPanUpdate = null,
GestureDragEndCallback onPanEnd = null,
GestureDragCancelCallback onPanCancel = null,
GestureScaleStartCallback onScaleStart = null,
GestureScaleUpdateCallback onScaleUpdate = null,
GestureScaleEndCallback onScaleEnd = null,
HitTestBehavior behavior = HitTestBehavior.deferToChild,
DragStartBehavior dragStartBehavior = DragStartBehavior.down
) : base(key)
{
D.assert(() => {
bool haveVerticalDrag =
onVerticalDragStart != null || onVerticalDragUpdate != null ||
onVerticalDragEnd != null;
bool haveHorizontalDrag =
onHorizontalDragStart != null || onHorizontalDragUpdate != null ||
onHorizontalDragEnd != null;
bool havePan = onPanStart != null || onPanUpdate != null || onPanEnd != null;
bool haveScale = onScaleStart != null || onScaleUpdate != null || onScaleEnd != null;
if (havePan || haveScale)
{
if (havePan && haveScale)
{
throw new UIWidgetsError(new List <DiagnosticsNode> {
new ErrorSummary("Incorrect GestureDetector arguments."),
new ErrorDescription(
"Having both a pan gesture recognizer and a scale gesture recognizer is redundant; scale is a superset of pan."
),
new ErrorHint("Just use the scale gesture recognizer.")
});
}
string recognizer = havePan ? "pan" : "scale";
if (haveVerticalDrag && haveHorizontalDrag)
{
throw new UIWidgetsError(
"Incorrect GestureDetector arguments.\n" +
$"Simultaneously having a vertical drag gesture recognizer, a horizontal drag gesture recognizer, and a {recognizer} gesture recognizer " +
$"will result in the {recognizer} gesture recognizer being ignored, since the other two will catch all drags."
);
}
}
return(true);
});
this.child = child;
this.onTapDown = onTapDown;
this.onTapUp = onTapUp;
this.onTap = onTap;
this.onTapCancel = onTapCancel;
this.onSecondaryTapDown = onSecondaryTapDown;
this.onSecondaryTapUp = onSecondaryTapUp;
this.onSecondaryTapCancel = onSecondaryTapCancel;
this.onDoubleTap = onDoubleTap;
this.onLongPress = onLongPress;
this.onLongPressUp = onLongPressUp;
this.onLongPressStart = onLongPressStart;
this.onLongPressMoveUpdate = onLongPressMoveUpdate;
this.onLongPressEnd = onLongPressEnd;
this.onVerticalDragDown = onVerticalDragDown;
this.onVerticalDragStart = onVerticalDragStart;
this.onVerticalDragUpdate = onVerticalDragUpdate;
this.onVerticalDragEnd = onVerticalDragEnd;
this.onVerticalDragCancel = onVerticalDragCancel;
this.onHorizontalDragDown = onHorizontalDragDown;
this.onHorizontalDragStart = onHorizontalDragStart;
this.onHorizontalDragUpdate = onHorizontalDragUpdate;
this.onHorizontalDragEnd = onHorizontalDragEnd;
this.onHorizontalDragCancel = onHorizontalDragCancel;
this.onForcePressEnd = onForcePressEnd;
this.onForcePressPeak = onForcePressPeak;
this.onForcePressStart = onForcePressStart;
this.onForcePressUpdate = onForcePressUpdate;
this.onPanDown = onPanDown;
this.onPanStart = onPanStart;
this.onPanUpdate = onPanUpdate;
this.onPanEnd = onPanEnd;
this.onPanCancel = onPanCancel;
this.onScaleStart = onScaleStart;
this.onScaleUpdate = onScaleUpdate;
this.onScaleEnd = onScaleEnd;
this.behavior = behavior;
this.dragStartBehavior = dragStartBehavior;
}