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;
        }
Beispiel #2
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        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;
        }