/// <summary>
/// Raises RotateBegin event.
/// </summary>
/// <param name="e">Provides event arguments.</param>
protected virtual void OnRotateBegin(GestureEventArgs e)
{
EventHandler<GestureEventArgs> handler = RotateBegin;
if (handler != null)
handler(this, e);
}
/// <summary>
/// Raises PressAndTap event.
/// </summary>
/// <param name="e">Provides event arguments.</param>
protected virtual void OnPressAndTap(GestureEventArgs e)
{
EventHandler<GestureEventArgs> handler = PressAndTap;
if (handler != null)
handler(this, e);
}
/// <summary>
/// The Windows message handler.
/// </summary>
private uint WindowProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam)
{
if(msg == WinApi.WM_TOUCH && (_HandlerType & eTouchHandlerType.Touch)== eTouchHandlerType.Touch)
{
bool handled = false;
foreach (TouchEventArgs arg in DecodeMessage(hWnd, msg, wParam, lParam, DpiX, DpiY))
{
if (arg.IsTouchDown)
OnTouchDown(arg);
if (arg.IsTouchMove)
OnTouchMove(arg);
if (arg.IsTouchUp)
OnTouchUp(arg);
handled |= arg.Handled;
}
if (handled)
{
WinApi.CloseTouchInputHandle(lParam);
return 1;
}
}
// Handle only gesture message
if (msg != WinApi.WM_GESTURE)
{
return WinApi.CallWindowProc(_originalWindowProcId, hWnd, msg, wParam, lParam);
}
WinApi.GESTUREINFO gestureInfo = new WinApi.GESTUREINFO();
gestureInfo.cbSize = (uint)Marshal.SizeOf(typeof(WinApi.GESTUREINFO));
bool result = WinApi.GetGestureInfo(lParam, ref gestureInfo);
if (!result)
throw new Exception("Cannot retrieve gesture information");
//Decode the gesture info and get the message event argument
GestureEventArgs eventArgs = new GestureEventArgs(this, ref gestureInfo);
try
{
//Fire the event using the event map
uint gestureId = GetGestureEventId(gestureInfo.dwID, gestureInfo.dwFlags);
if (gestureId == GestureEventId.Begin)
OnBegin(eventArgs);
else if (gestureId == GestureEventId.End)
OnEnd(eventArgs);
else if (gestureId == GestureEventId.Pan)
OnPan(eventArgs);
else if (gestureId == GestureEventId.PanBegin)
OnPanBegin(eventArgs);
else if (gestureId == GestureEventId.PanEnd)
OnPanEnd(eventArgs);
else if (gestureId == GestureEventId.PressAndTap)
OnPressAndTap(eventArgs);
else if (gestureId == GestureEventId.Rotate)
OnRotate(eventArgs);
else if (gestureId == GestureEventId.RotateBegin)
OnRotateBegin(eventArgs);
else if (gestureId == GestureEventId.RotateEnd)
OnRotateEnd(eventArgs);
else if (gestureId == GestureEventId.TwoFingerTap)
OnTwoFingerTap(eventArgs);
else if (gestureId == GestureEventId.Zoom)
OnZoom(eventArgs);
else if (gestureId == GestureEventId.ZoomBegin)
OnZoomBegin(eventArgs);
else if (gestureId == GestureEventId.ZoomEnd)
OnZoomEnd(eventArgs);
}
catch (ArgumentOutOfRangeException) //In case future releases will introduce new event values
{
}
//Keep the last message for relative calculations
LastEventArgs = eventArgs;
//Keep the first message for relative calculations
if (eventArgs.IsBegin)
LastBeginEventArgs = eventArgs;
if (eventArgs.Handled)
{
WinApi.CloseGestureInfoHandle(lParam);
return 1;
}
else
return WinApi.CallWindowProc(_originalWindowProcId, hWnd, msg, wParam, lParam);
}
/// <summary>
/// Raises End event.
/// </summary>
/// <param name="e">Provides event arguments.</param>
protected virtual void OnEnd(GestureEventArgs e)
{
EventHandler<GestureEventArgs> handler = End;
if (handler != null)
handler(this, e);
}
/// <summary>
/// Raises TwoFingerTap event.
/// </summary>
/// <param name="e">Provides event arguments.</param>
protected virtual void OnTwoFingerTap(GestureEventArgs e)
{
EventHandler<GestureEventArgs> handler = TwoFingerTap;
if (handler != null)
handler(this, e);
}
