internal static extern bool GetWindowOrgEx(IntPtr hdc, out PointW lpPoint);
internal static extern bool ClientToScreen(IntPtr hWnd, ref PointW lpPoint);
internal static extern bool GetCurrentPositionEx(IntPtr hdc, out PointW lpPoint);
/// <summary>
/// A callback function which will be called every time a mouse activity detected.
/// https://docs.microsoft.com/en-us/windows/win32/winmsg/lowlevelmouseproc
/// </summary>
/// <param name="code">
/// Specifies whether the hook procedure must process the message.
/// If code is HC_ACTION, the hook procedure must process the message.
/// If code is less than zero, the hook procedure must pass the message to the
/// CallNextHookEx function without further processing and must return the value returned by CallNextHookEx.
/// </param>
/// <param name="type">
/// Same as wParam. Specifies whether the message was sent by the current thread.
/// If the message was sent by the current thread, it is nonzero; otherwise, it is zero.
/// </param>
/// <param name="structure">
/// Same as lParam. Pointer to a CWPSTRUCT structure that contains details about the message.
/// </param>
/// <returns>
/// If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
/// If nCode is greater than or equal to zero, it is highly recommended that you call CallNextHookEx
/// and return the value it returns; otherwise, other applications that have installed WH_CALLWNDPROC
/// hooks will not receive hook notifications and may behave incorrectly as a result. If the hook
/// procedure does not call CallNextHookEx, the return value should be zero.
/// </returns>
private IntPtr MouseHookProc(int code, uint type, IntPtr structure)
{
//If it's not Ok or no one listens to this event, call next hook.
if (code < 0 || OnMouseActivity == null)
{
return(User32.CallNextHookEx(_mouseHookHandle, code, type, structure));
}
//Marshall the data from callback.
var mouse = (MouseHook)Marshal.PtrToStructure(structure, typeof(MouseHook));
var data = new WordLevel.WordUnion {
Number = mouse.MouseData
};
#region Mouse actions
switch ((NativeMouseEvents)type)
{
case NativeMouseEvents.MouseMove:
{
if (!_isDragging && _leftButton == MouseButtonState.Pressed)
{
var isXDragging = Math.Abs(mouse.Point.X - _dragStartPoint.X) > SystemParameters.MinimumHorizontalDragDistance;
var isYDragging = Math.Abs(mouse.Point.Y - _dragStartPoint.Y) > SystemParameters.MinimumVerticalDragDistance;
_isDragging = isXDragging || isYDragging;
if (_isDragging)
{
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.MouseDragStart, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
break;
}
}
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.MouseMove, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
break;
}
case NativeMouseEvents.OutsideLeftButtonDown:
case NativeMouseEvents.LeftButtonDown:
{
DetectDoubleClick(NativeMouseEvents.LeftButtonDoubleClick, mouse.Point);
_leftButton = MouseButtonState.Pressed;
_dragStartPoint = mouse.Point;
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.LeftButtonDown, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
break;
}
case NativeMouseEvents.OutsideLeftButtonUp:
case NativeMouseEvents.LeftButtonUp:
{
//End drag.
if (_isDragging)
{
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.MouseDragEnd, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
_isDragging = false;
}
_leftButton = MouseButtonState.Released;
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.LeftButtonUp, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
break;
}
case NativeMouseEvents.OutsideLeftButtonDoubleClick:
case NativeMouseEvents.LeftButtonDoubleClick:
{
_leftButton = MouseButtonState.Pressed;
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.LeftButtonDoubleClick, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
_leftButton = MouseButtonState.Released;
break;
}
case NativeMouseEvents.OutsideRightButtonDown:
case NativeMouseEvents.RightButtonDown:
{
DetectDoubleClick(NativeMouseEvents.RightButtonDoubleClick, mouse.Point);
_rightButton = MouseButtonState.Pressed;
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.RightButtonDown, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
break;
}
case NativeMouseEvents.OutsideRightButtonUp:
case NativeMouseEvents.RightButtonUp:
{
_rightButton = MouseButtonState.Released;
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.RightButtonUp, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
break;
}
case NativeMouseEvents.OutsideRightButtonDoubleClick:
case NativeMouseEvents.RightButtonDoubleClick:
{
_rightButton = MouseButtonState.Pressed;
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.RightButtonDoubleClick, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
_rightButton = MouseButtonState.Released;
break;
}
case NativeMouseEvents.OutsideMiddleButtonDown:
case NativeMouseEvents.MiddleButtonDown:
{
DetectDoubleClick(NativeMouseEvents.MiddleButtonDoubleClick, mouse.Point);
_middleButton = MouseButtonState.Pressed;
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.MiddleButtonDown, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
break;
}
case NativeMouseEvents.OutsideMiddleButtonUp:
case NativeMouseEvents.MiddleButtonUp:
{
_middleButton = MouseButtonState.Released;
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.MiddleButtonUp, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
break;
}
case NativeMouseEvents.OutsideMiddleButtonDoubleClick:
case NativeMouseEvents.MiddleButtonDoubleClick:
{
_middleButton = MouseButtonState.Pressed;
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.MiddleButtonDoubleClick, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
_middleButton = MouseButtonState.Released;
break;
}
case NativeMouseEvents.MouseWheel:
{
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.MouseWheel, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button, data.High));
break;
}
case NativeMouseEvents.MouseWheelHorizontal:
{
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.MouseWheelHorizontal, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button, data.High));
break;
}
case NativeMouseEvents.OutsideExtraButtonDown:
case NativeMouseEvents.ExtraButtonDown:
{
DetectDoubleClick(NativeMouseEvents.ExtraButtonDoubleClick, mouse.Point);
if (data.High == MouseFirstExtraButton)
{
_extraButton = MouseButtonState.Pressed;
}
else
{
_extra2Button = MouseButtonState.Pressed;
}
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.ExtraButtonDown, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
break;
}
case NativeMouseEvents.OutsideExtraButtonDoubleClick:
case NativeMouseEvents.ExtraButtonDoubleClick:
{
if (data.High == MouseFirstExtraButton)
{
_extraButton = MouseButtonState.Pressed;
}
else
{
_extra2Button = MouseButtonState.Pressed;
}
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.ExtraButtonDoubleClick, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
if (data.High == MouseFirstExtraButton)
{
_extraButton = MouseButtonState.Released;
}
else
{
_extra2Button = MouseButtonState.Released;
}
break;
}
case NativeMouseEvents.OutsideExtraButtonUp:
case NativeMouseEvents.ExtraButtonUp:
{
if (data.High == MouseFirstExtraButton)
{
_extraButton = MouseButtonState.Released;
}
else
{
_extra2Button = MouseButtonState.Released;
}
OnMouseActivity?.Invoke(this, new SimpleMouseGesture(NativeMouseEvents.ExtraButtonUp, mouse.Point.X, mouse.Point.Y, _leftButton, _rightButton, _middleButton, _extraButton, _extra2Button));
break;
}
//default: I can't return now, it will break the click detector.
//return CallNextHookEx(hMouseHook, nCode, wParam, lParam);
//HU3HU3 - A little funny momment: I just frooze my cursor by returning 1 instead of calling the next hook. - Nicke
//Congrats to myself. ;D
//05:24 AM 01/02/2014 (day-month-year)
}
#endregion
//Call the next hook.
return(User32.CallNextHookEx(_mouseHookHandle, code, type, structure));
}