unsafe IntPtr WindowProcedure(IntPtr handle, WindowMessage message, IntPtr wParam, IntPtr lParam)
{
switch (message)
{
#region Size / Move / Style events
case WindowMessage.ACTIVATE:
// See http://msdn.microsoft.com/en-us/library/ms646274(VS.85).aspx (WM_ACTIVATE notification):
// wParam: The low-order word specifies whether the window is being activated or deactivated.
bool new_focused_state = Focused;
focused = (wParam.ToInt64() & 0xFFFF) != 0;
if (new_focused_state != Focused && FocusedChanged != null)
{
FocusedChanged(this, EventArgs.Empty);
}
break;
case WindowMessage.ENTERMENULOOP:
case WindowMessage.ENTERSIZEMOVE:
case WindowMessage.EXITMENULOOP:
case WindowMessage.EXITSIZEMOVE:
break;
case WindowMessage.ERASEBKGND:
return(new IntPtr(1));
case WindowMessage.WINDOWPOSCHANGED:
WindowPosition *pos = (WindowPosition *)lParam;
if (window != null && pos->hwnd == window.handle)
{
Point new_location = new Point(pos->x, pos->y);
if (Location != new_location)
{
bounds.Location = new_location;
if (Move != null)
{
Move(this, EventArgs.Empty);
}
}
Size new_size = new Size(pos->cx, pos->cy);
if (Size != new_size)
{
bounds.Width = pos->cx;
bounds.Height = pos->cy;
Win32Rectangle rect;
API.GetClientRect(handle, out rect);
client_rectangle = rect.ToRectangle();
API.SetWindowPos(window.handle, IntPtr.Zero,
bounds.X, bounds.Y, bounds.Width, bounds.Height,
SetWindowPosFlags.NOZORDER | SetWindowPosFlags.NOOWNERZORDER |
SetWindowPosFlags.NOACTIVATE | SetWindowPosFlags.NOSENDCHANGING);
if (suppress_resize <= 0 && Resize != null)
{
Resize(this, EventArgs.Empty);
}
}
}
break;
case WindowMessage.STYLECHANGED:
if (wParam.ToInt64() == (long)GWL.STYLE)
{
WindowStyle style = ((StyleStruct *)lParam)->New;
if ((style & WindowStyle.Popup) != 0)
{
hiddenBorder = true;
}
else if ((style & WindowStyle.ThickFrame) != 0)
{
hiddenBorder = false;
}
}
break;
case WindowMessage.SIZE:
SizeMessage state = (SizeMessage)wParam.ToInt64();
WindowState new_state = windowState;
switch (state)
{
case SizeMessage.RESTORED: new_state = WindowState.Normal; break;
case SizeMessage.MINIMIZED: new_state = WindowState.Minimized; break;
case SizeMessage.MAXIMIZED: new_state = hiddenBorder ?
WindowState.Fullscreen : WindowState.Maximized;
break;
}
if (new_state != windowState)
{
windowState = new_state;
if (WindowStateChanged != null)
{
WindowStateChanged(this, EventArgs.Empty);
}
}
break;
#endregion
#region Input events
case WindowMessage.CHAR:
key_press.KeyChar = (char)wParam.ToInt64();
if (KeyPress != null)
{
KeyPress(this, key_press);
}
break;
case WindowMessage.MOUSEMOVE:
Point point = new Point(
(short)((uint)lParam.ToInt32() & 0x0000FFFF),
(short)(((uint)lParam.ToInt32() & 0xFFFF0000) >> 16));
mouse.Position = point;
if (mouse_outside_window)
{
// Once we receive a mouse move event, it means that the mouse has
// re-entered the window.
mouse_outside_window = false;
EnableMouseTracking();
if (MouseEnter != null)
{
MouseEnter(this, EventArgs.Empty);
}
}
break;
case WindowMessage.MOUSELEAVE:
mouse_outside_window = true;
// Mouse tracking is disabled automatically by the OS
if (MouseLeave != null)
{
MouseLeave(this, EventArgs.Empty);
}
// Set all mouse buttons to off when user leaves window, prevents them being stuck down.
for (MouseButton btn = 0; btn < MouseButton.LastButton; btn++)
{
mouse[btn] = false;
}
break;
case WindowMessage.MOUSEWHEEL:
// This is due to inconsistent behavior of the WParam value on 64bit arch, whese
// wparam = 0xffffffffff880000 or wparam = 0x00000000ff100000
mouse.Wheel += ((long)wParam << 32 >> 48) / 120.0f;
return(IntPtr.Zero);
case WindowMessage.LBUTTONDOWN:
mouse[MouseButton.Left] = true;
break;
case WindowMessage.MBUTTONDOWN:
mouse[MouseButton.Middle] = true;
break;
case WindowMessage.RBUTTONDOWN:
mouse[MouseButton.Right] = true;
break;
case WindowMessage.XBUTTONDOWN:
keyboard[(((ulong)wParam.ToInt64() >> 16) & 0xFFFF) == 1 ? Key.XButton1 : Key.XButton2] = true;
break;
case WindowMessage.LBUTTONUP:
mouse[MouseButton.Left] = false;
break;
case WindowMessage.MBUTTONUP:
mouse[MouseButton.Middle] = false;
break;
case WindowMessage.RBUTTONUP:
mouse[MouseButton.Right] = false;
break;
case WindowMessage.XBUTTONUP:
keyboard[(((ulong)wParam.ToInt64() >> 16) & 0xFFFF) == 1 ? Key.XButton1 : Key.XButton2] = false;
break;
// Keyboard events:
case WindowMessage.KEYDOWN:
case WindowMessage.KEYUP:
case WindowMessage.SYSKEYDOWN:
case WindowMessage.SYSKEYUP:
bool pressed = message == WindowMessage.KEYDOWN ||
message == WindowMessage.SYSKEYDOWN;
// Shift/Control/Alt behave strangely when e.g. ShiftRight is held down and ShiftLeft is pressed
// and released. It looks like neither key is released in this case, or that the wrong key is
// released in the case of Control and Alt.
// To combat this, we are going to release both keys when either is released. Hacky, but should work.
// Win95 does not distinguish left/right key constants (GetAsyncKeyState returns 0).
// In this case, both keys will be reported as pressed.
bool extended = (lParam.ToInt64() & ExtendedBit) != 0;
switch ((VirtualKeys)wParam)
{
case VirtualKeys.SHIFT:
// The behavior of this key is very strange. Unlike Control and Alt, there is no extended bit
// to distinguish between left and right keys. Moreover, pressing both keys and releasing one
// may result in both keys being held down (but not always).
bool lShiftDown = (API.GetKeyState((int)VirtualKeys.LSHIFT) >> 15) == 1;
bool rShiftDown = (API.GetKeyState((int)VirtualKeys.RSHIFT) >> 15) == 1;
if (!pressed || lShiftDown != rShiftDown)
{
Keyboard[Input.Key.ShiftLeft] = lShiftDown;
Keyboard[Input.Key.ShiftRight] = rShiftDown;
}
return(IntPtr.Zero);
case VirtualKeys.CONTROL:
if (extended)
{
keyboard[Input.Key.ControlRight] = pressed;
}
else
{
keyboard[Input.Key.ControlLeft] = pressed;
}
return(IntPtr.Zero);
case VirtualKeys.MENU:
if (extended)
{
keyboard[Input.Key.AltRight] = pressed;
}
else
{
keyboard[Input.Key.AltLeft] = pressed;
}
return(IntPtr.Zero);
case VirtualKeys.RETURN:
if (extended)
{
keyboard[Key.KeypadEnter] = pressed;
}
else
{
keyboard[Key.Enter] = pressed;
}
return(IntPtr.Zero);
default:
Key tkKey;
if (!KeyMap.TryGetMappedKey((VirtualKeys)wParam, out tkKey))
{
Debug.Print("Virtual key {0} ({1}) not mapped.", (VirtualKeys)wParam, lParam.ToInt64());
break;
}
else
{
keyboard[tkKey] = pressed;
}
return(IntPtr.Zero);
}
break;
case WindowMessage.SYSCHAR:
return(IntPtr.Zero);
case WindowMessage.KILLFOCUS:
keyboard.ClearKeys();
break;
#endregion
#region Creation / Destruction events
case WindowMessage.CREATE:
CreateStruct cs = (CreateStruct)Marshal.PtrToStructure(lParam, typeof(CreateStruct));
if (cs.hwndParent == IntPtr.Zero)
{
bounds.X = cs.x;
bounds.Y = cs.y;
bounds.Width = cs.cx;
bounds.Height = cs.cy;
Win32Rectangle rect;
API.GetClientRect(handle, out rect);
client_rectangle = rect.ToRectangle();
invisible_since_creation = true;
}
break;
case WindowMessage.CLOSE:
System.ComponentModel.CancelEventArgs e = new System.ComponentModel.CancelEventArgs();
if (Closing != null)
{
Closing(this, e);
}
if (!e.Cancel)
{
DestroyWindow();
break;
}
return(IntPtr.Zero);
case WindowMessage.DESTROY:
exists = false;
API.UnregisterClass(ClassName, Instance);
window.Dispose();
if (Closed != null)
{
Closed(this, EventArgs.Empty);
}
break;
#endregion
}
return(API.DefWindowProc(handle, message, wParam, lParam));
}
public void Close()
{
API.PostMessage(window.handle, WindowMessage.CLOSE, IntPtr.Zero, IntPtr.Zero);
}
