private void ScrollViewerScrollWheelChanged(object sender, ScrollWheelChangedEventArgs args)
{
var d = args.Delta / 10f;
UpdatePosition(new PointF(d, d));
}
protected internal virtual void OnScrollWheelChanged(ScrollWheelChangedEventArgs args)
{
ScrollWheelChanged?.Invoke(this, args);
}
internal void Update()
{
if (!Initialized)
{
InvalidateLayout(true);
Initialized = true;
}
var mouseState = Mouse.GetState();
TouchLocation touchState;
var touchCollection = TouchPanel.GetState();
if (touchCollection.Count > 0)
{
touchState = touchCollection[0];
}
var touchPosition = (PointF)touchState.Position.ToPoint();
var mousePosition = (PointF)mouseState.Position;
Control content;
if (FlyOut != null)
{
content = FlyOut;
}
else
{
content = _mainGrid;
}
if (mousePosition != LastMousePosition)
{
List <MouseButton> buttons = new List <MouseButton>();
if (mouseState.LeftButton == ButtonState.Pressed)
{
buttons.Add(MouseButton.Left);
}
if (mouseState.RightButton == ButtonState.Pressed)
{
buttons.Add(MouseButton.Right);
}
if (mouseState.MiddleButton == ButtonState.Pressed)
{
buttons.Add(MouseButton.Middle);
}
var args = new MouseEventArgs(mousePosition, buttons);
VisualTreeHelper.IterateVisualTree(content, args,
(c, a) => c.BoundingRect.Contains(a.Position) && !c.BoundingRect.Contains(LastMousePosition), (c, a) => { c.OnMouseEnter(a); }, (c, a) => c.BoundingRect.Contains(a.Position));
VisualTreeHelper.IterateVisualTree(content, args, (c, a) => c.BoundingRect.Contains(a.Position) && c.BoundingRect.Contains(LastMousePosition), (c, a) => { c.OnMouseMove(a); }, null);
VisualTreeHelper.IterateVisualTree(content, args, (c, a) => !c.BoundingRect.Contains(a.Position) && c.BoundingRect.Contains(LastMousePosition), (c, a) => { c.OnMouseLeave(a); }, (c, a) => c.BoundingRect.Contains(LastMousePosition));
LastMousePosition = mousePosition;
}
HandleMouseButton(mouseState.LeftButton, ButtonState.Pressed, MouseButton.Left, mousePosition, content, (c, a) => c.OnMouseDown(a));
HandleMouseButton(mouseState.LeftButton, ButtonState.Released, MouseButton.Left, mousePosition, content, (c, a) => c.OnMouseUp(a));
HandleMouseButton(mouseState.RightButton, ButtonState.Pressed, MouseButton.Right, mousePosition, content, (c, a) => c.OnMouseDown(a));
HandleMouseButton(mouseState.RightButton, ButtonState.Released, MouseButton.Right, mousePosition, content, (c, a) => c.OnMouseUp(a));
HandleMouseButton(mouseState.MiddleButton, ButtonState.Pressed, MouseButton.Middle, mousePosition, content, (c, a) => c.OnMouseDown(a));
HandleMouseButton(mouseState.MiddleButton, ButtonState.Released, MouseButton.Middle, mousePosition, content, (c, a) => c.OnMouseUp(a));
if (mouseState.ScrollWheelValue != LastScrollWheelValue)
{
var args = new ScrollWheelChangedEventArgs(mousePosition, mouseState.ScrollWheelValue - LastScrollWheelValue);
VisualTreeHelper.IterateVisualTree(content, args, (c, a) => c.BoundingRect.Contains(a.Position), (c, a) => { c.OnScrollWheelChanged(a); }, null);
LastScrollWheelValue = mouseState.ScrollWheelValue;
}
if (touchState.State == TouchLocationState.Pressed)
{
var args = new TouchEventArgs(touchPosition);
VisualTreeHelper.IterateVisualTree(content, args,
(c, a) => c.BoundingRect.Contains(a.Position),
(c, a) => { c.OnTouchDown(a); },
null
);
LastTouchPosition = touchPosition;
}
if (touchState.State == TouchLocationState.Released)
{
var args = new TouchEventArgs(touchPosition);
VisualTreeHelper.IterateVisualTree(content, args,
(c, a) => c.BoundingRect.Contains(a.Position),
(c, a) => { c.OnTouchUp(a); },
null
);
}
if (touchState.State == TouchLocationState.Moved && touchPosition != LastTouchPosition)
{
var args = new TouchEventArgs(touchPosition);
VisualTreeHelper.IterateVisualTree(content, args,
(c, a) => c.BoundingRect.Contains(a.Position) || c.BoundingRect.Contains(LastTouchPosition),
(c, a) =>
{
if (c.BoundingRect.Contains(a.Position))
{
c.OnTouchMove(a);
}
else
{
c.OnTouchCancel(a);
}
},
null
);
LastTouchPosition = touchPosition;
}
}
