/// <inheritdoc cref="HookBase.LowLevelHook"/>
protected override IntPtr LowLevelHook(int nCode, IntPtr wParam, IntPtr lParam)
{
bool prevented = false;
RawMouseMessages state = (RawMouseMessages)wParam;
if (Enum.IsDefined(typeof(RawMouseMessages), state))
{
MouseState data = Marshal.PtrToStructure <MouseState>(lParam);
prevented = Handle(state, data);
}
return(prevented ? (IntPtr)1 : User32.CallNextHookEx(IntPtr.Zero, nCode, wParam, lParam));
}
private bool Handle(RawMouseMessages state, MouseState data)
{
bool prevented = false;
IPoint coords = new Point(data.Point.X, data.Point.Y);
int delta = data.WheelDelta;
DateTime time = data.DateTime;
switch (state)
{
case RawMouseMessages.Move:
{
IMouseEventArgs eventArgs = new MouseEventArgs(MouseEventType.Movement, coords, delta, MouseButtons.None, KeyState.None, false, time);
InvokeOnEvent(this, eventArgs);
MouseMove?.Invoke(this, eventArgs);
prevented = eventArgs.DefaultPrevented;
break;
}
case RawMouseMessages.LeftDown:
{
bool isDoubleClick = (data.Time - LastLeftClick) <= User32.DoubleClickTime;
Interlocked.Exchange(ref LastLeftClick, data.Time - (isDoubleClick ? User32.DoubleClickTime + 1 : 0));
IMouseEventArgs eventArgs = new MouseEventArgs(MouseEventType.Key, coords, delta, MouseButtons.Left, KeyState.Down, isDoubleClick, time);
InvokeOnEvent(this, eventArgs);
MouseDown?.Invoke(this, eventArgs);
MouseClick?.Invoke(this, eventArgs);
if (isDoubleClick)
{
MouseDoubleClick?.Invoke(this, eventArgs);
}
prevented = eventArgs.DefaultPrevented;
break;
}
case RawMouseMessages.MiddleDown:
case RawMouseMessages.RightDown:
{
MouseButtons button = state == RawMouseMessages.RightDown ? MouseButtons.Right : MouseButtons.Middle;
IMouseEventArgs eventArgs = new MouseEventArgs(MouseEventType.Key, coords, delta, button, KeyState.Down, false, time);
InvokeOnEvent(this, eventArgs);
MouseDown?.Invoke(this, eventArgs);
MouseClick?.Invoke(this, eventArgs);
prevented = eventArgs.DefaultPrevented;
break;
}
case RawMouseMessages.LeftUp:
case RawMouseMessages.MiddleUp:
case RawMouseMessages.RightUp:
{
MouseButtons button = state == RawMouseMessages.LeftUp ? MouseButtons.Left : state == RawMouseMessages.MiddleUp ? MouseButtons.Middle : MouseButtons.Right;
IMouseEventArgs eventArgs = new MouseEventArgs(MouseEventType.Key, coords, delta, button, KeyState.Up, false, time);
InvokeOnEvent(this, eventArgs);
MouseUp?.Invoke(this, eventArgs);
prevented = eventArgs.DefaultPrevented;
break;
}
case RawMouseMessages.Wheel:
{
IMouseEventArgs eventArgs = new MouseEventArgs(MouseEventType.Wheel, coords, delta, MouseButtons.Wheel, delta > 0 ? KeyState.Up : KeyState.Down, false, time);
InvokeOnEvent(this, eventArgs);
MouseWheel?.Invoke(this, eventArgs);
prevented = eventArgs.DefaultPrevented;
break;
}
case RawMouseMessages.HWheel:
{
IMouseEventArgs eventArgs = new MouseEventArgs(MouseEventType.HorizontalWheel, coords, delta, MouseButtons.Wheel, delta > 0 ? KeyState.Up : KeyState.Down, false, time);
InvokeOnEvent(this, eventArgs);
MouseHorizontalWheel?.Invoke(this, eventArgs);
prevented = eventArgs.DefaultPrevented;
break;
}
default:
break;
}
return(prevented);
}
