protected unsafe override LResult WindowProcedure(WindowHandle window, MessageType message, WParam wParam, LParam lParam)
{
switch (message)
{
case MessageType.Create:
_baseUnits = Windows.GetDialogBaseUnits();
_btnWidth = _baseUnits.Width * 8;
_btnHeight = _baseUnits.Height * 4;
// Create the owner-draw pushbuttons
_hwndSmaller = Windows.CreateWindow("button", "",
WindowStyles.Child | WindowStyles.Visible | (WindowStyles)ButtonStyles.OwnerDrawn,
ExtendedWindowStyles.Default,
new Rectangle(0, 0, _btnWidth, _btnHeight),
window, (MenuHandle)ID_SMALLER, ModuleInstance, IntPtr.Zero);
_hwndLarger = Windows.CreateWindow("button", "",
WindowStyles.Child | WindowStyles.Visible | (WindowStyles)ButtonStyles.OwnerDrawn,
ExtendedWindowStyles.Default,
new Rectangle(0, 0, _btnWidth, _btnHeight),
window, (MenuHandle)ID_LARGER, ModuleInstance, IntPtr.Zero);
return(0);
case MessageType.Size:
_cxClient = lParam.LowWord;
_cyClient = lParam.HighWord;
// Move the buttons to the new center
_hwndSmaller.MoveWindow(
new Rectangle(_cxClient / 2 - 3 * _btnWidth / 2, _cyClient / 2 - _btnHeight / 2, _btnWidth, _btnHeight),
repaint: true);
_hwndLarger.MoveWindow(
new Rectangle(_cxClient / 2 + _btnWidth / 2, _cyClient / 2 - _btnHeight / 2, _btnWidth, _btnHeight),
repaint: true);
return(0);
case MessageType.Command:
Rectangle rc = window.GetWindowRectangle();
// Make the window 10% smaller or larger
switch ((int)(uint)wParam)
{
case ID_SMALLER:
rc.Inflate(rc.Width / -10, rc.Height / -10);
break;
case ID_LARGER:
rc.Inflate(rc.Width / 10, rc.Height / 10);
break;
}
window.MoveWindow(new Rectangle(rc.Left, rc.Top, rc.Right - rc.Left, rc.Bottom - rc.Top), repaint: true);
return(0);
case MessageType.DrawItem:
DRAWITEMSTRUCT *pdis = (DRAWITEMSTRUCT *)lParam;
// Fill area with white and frame it black
using (DeviceContext dc = new DeviceContext(pdis->hDC))
{
Rectangle rect = pdis->rcItem;
dc.FillRectangle(rect, StockBrush.White);
dc.FrameRectangle(rect, StockBrush.Black);
// Draw inward and outward black triangles
int cx = rect.Right - rect.Left;
int cy = rect.Bottom - rect.Top;
Point[] pt = new Point[3];
switch ((int)pdis->CtlID)
{
case ID_SMALLER:
pt[0].X = 3 * cx / 8; pt[0].Y = 1 * cy / 8;
pt[1].X = 5 * cx / 8; pt[1].Y = 1 * cy / 8;
pt[2].X = 4 * cx / 8; pt[2].Y = 3 * cy / 8;
Triangle(dc, pt);
pt[0].X = 7 * cx / 8; pt[0].Y = 3 * cy / 8;
pt[1].X = 7 * cx / 8; pt[1].Y = 5 * cy / 8;
pt[2].X = 5 * cx / 8; pt[2].Y = 4 * cy / 8;
Triangle(dc, pt);
pt[0].X = 5 * cx / 8; pt[0].Y = 7 * cy / 8;
pt[1].X = 3 * cx / 8; pt[1].Y = 7 * cy / 8;
pt[2].X = 4 * cx / 8; pt[2].Y = 5 * cy / 8;
Triangle(dc, pt);
pt[0].X = 1 * cx / 8; pt[0].Y = 5 * cy / 8;
pt[1].X = 1 * cx / 8; pt[1].Y = 3 * cy / 8;
pt[2].X = 3 * cx / 8; pt[2].Y = 4 * cy / 8;
Triangle(dc, pt);
break;
case ID_LARGER:
pt[0].X = 5 * cx / 8; pt[0].Y = 3 * cy / 8;
pt[1].X = 3 * cx / 8; pt[1].Y = 3 * cy / 8;
pt[2].X = 4 * cx / 8; pt[2].Y = 1 * cy / 8;
Triangle(dc, pt);
pt[0].X = 5 * cx / 8; pt[0].Y = 5 * cy / 8;
pt[1].X = 5 * cx / 8; pt[1].Y = 3 * cy / 8;
pt[2].X = 7 * cx / 8; pt[2].Y = 4 * cy / 8;
Triangle(dc, pt);
pt[0].X = 3 * cx / 8; pt[0].Y = 5 * cy / 8;
pt[1].X = 5 * cx / 8; pt[1].Y = 5 * cy / 8;
pt[2].X = 4 * cx / 8; pt[2].Y = 7 * cy / 8;
Triangle(dc, pt);
pt[0].X = 3 * cx / 8; pt[0].Y = 3 * cy / 8;
pt[1].X = 3 * cx / 8; pt[1].Y = 5 * cy / 8;
pt[2].X = 1 * cx / 8; pt[2].Y = 4 * cy / 8;
Triangle(dc, pt);
break;
}
// Invert the rectangle if the button is selected
if ((pdis->itemState & OwnerDrawStates.Selected) != 0)
{
dc.InvertRectangle(rect);
}
if ((pdis->itemState & OwnerDrawStates.Focus) != 0)
{
rect = Rectangle.FromLTRB(
rect.Left + cx / 16,
rect.Top + cy / 16,
rect.Right - cx / 16,
rect.Bottom - cy / 16);
dc.DrawFocusRectangle(rect);
}
}
return(0);
}
return(base.WindowProcedure(window, message, wParam, lParam));
}
public static unsafe void ReflectMessage(ref Message msg, out bool handled)
{
IntPtr hWndChild = IntPtr.Zero;
if (msg.MessageId == WindowMessages.WM_COMMAND)
{
if (msg.LParam != IntPtr.Zero)
{
hWndChild = msg.LParam;
}
}
else if (msg.MessageId == WindowMessages.WM_NOTIFY)
{
NMHDR *header = (NMHDR *)msg.LParam;
hWndChild = header->hWndFrom;
}
else if (msg.MessageId == WindowMessages.WM_PARENTNOTIFY)
{
uint submessage = (uint)((int)msg.WParam & 0xFFFF);
if (submessage == WindowMessages.WM_CREATE || submessage == WindowMessages.WM_DESTROY)
{
hWndChild = msg.LParam;
}
else
{
int controlId = ((int)msg.WParam >> 16) & 0xFFFF;
hWndChild = NativeMethods.GetDlgItem(msg.TargetHandle, controlId);
}
}
else if (msg.MessageId == WindowMessages.WM_DRAWITEM)
{
if (msg.WParam != IntPtr.Zero)
{
DRAWITEMSTRUCT *drawItemStruct = (DRAWITEMSTRUCT *)msg.WParam;
hWndChild = drawItemStruct->hwndItem;
}
}
else if (msg.MessageId == WindowMessages.WM_MEASUREITEM)
{
if (msg.WParam != IntPtr.Zero)
{
MEASUREITEMSTRUCT *measureItemStruct = (MEASUREITEMSTRUCT *)msg.WParam;
hWndChild = NativeMethods.GetDlgItem(msg.TargetHandle, (int)measureItemStruct->CtlID);
}
}
else if (msg.MessageId == WindowMessages.WM_COMPAREITEM)
{
if (msg.WParam != IntPtr.Zero)
{
COMPAREITEMSTRUCT *compareStruct = (COMPAREITEMSTRUCT *)msg.WParam;
hWndChild = compareStruct->hwndItem;
}
}
else if (msg.MessageId == WindowMessages.WM_DELETEITEM)
{
if (msg.WParam != IntPtr.Zero)
{
DELETEITEMSTRUCT *deleteStruct = (DELETEITEMSTRUCT *)msg.WParam;
hWndChild = deleteStruct->hwndItem;
}
}
else if (msg.MessageId == WindowMessages.WM_VKEYTOITEM || msg.MessageId == WindowMessages.WM_CHARTOITEM ||
msg.MessageId == WindowMessages.WM_HSCROLL || msg.MessageId == WindowMessages.WM_VSCROLL)
{
hWndChild = msg.LParam;
}
else if (msg.MessageId == WindowMessages.WM_CTLCOLORBTN || msg.MessageId == WindowMessages.WM_CTLCOLORDLG ||
msg.MessageId == WindowMessages.WM_CTLCOLOREDIT || msg.MessageId == WindowMessages.WM_CTLCOLORMSGBOX ||
msg.MessageId == WindowMessages.WM_CTLCOLORMSGBOX || msg.MessageId == WindowMessages.WM_CTLCOLORSCROLLBAR ||
msg.MessageId == WindowMessages.WM_CTLCOLORSTATIC)
{
hWndChild = msg.LParam;
}
if (hWndChild == IntPtr.Zero)
{
handled = false;
return;
}
if (!NativeMethods.IsWindow(hWndChild))
{
throw new InvalidOperationException("hwndChild not a valid HWND");
}
// This code relies on the fact that NativeMethods.GetProp() returns IntPtr.Zero
// if the property has not been set. This code only cares if the handled flag
// was set to true. If the flag is false, this code behaves the same as if
// SetReflectedMessageHandled() was never called at all.
NativeMethods.RemoveProp(hWndChild, HandledProperty); // clear it out, just in case
IntPtr result = NativeMethods.SendMessage(hWndChild, msg.MessageId + WM_REFLECTED_MESSAGE_BASE, msg.WParam, msg.LParam);
handled = NativeMethods.GetProp(hWndChild, HandledProperty) != IntPtr.Zero;
NativeMethods.RemoveProp(hWndChild, HandledProperty);
if (handled)
{
msg.Result = result;
}
}
static unsafe LRESULT WindowProcedure(WindowHandle window, WindowMessage message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WindowMessage.Create:
baseUnits = Windows.GetDialogBaseUnits();
btnWidth = baseUnits.cx * 8;
btnHeight = baseUnits.cy * 4;
// Create the owner-draw pushbuttons
CREATESTRUCT *create = (CREATESTRUCT *)lParam;
hwndSmaller = Windows.CreateWindow("button", "",
WindowStyles.Child | WindowStyles.Visible | (WindowStyles)ButtonStyles.OwnerDrawn,
ExtendedWindowStyles.None,
0, 0, btnWidth, btnHeight,
window, (IntPtr)ID_SMALLER, create->Instance, IntPtr.Zero);
hwndLarger = Windows.CreateWindow("button", "",
WindowStyles.Child | WindowStyles.Visible | (WindowStyles)ButtonStyles.OwnerDrawn,
ExtendedWindowStyles.None,
0, 0, btnWidth, btnHeight,
window, (IntPtr)ID_LARGER, create->Instance, IntPtr.Zero);
return(0);
case WindowMessage.Size:
cxClient = lParam.LowWord;
cyClient = lParam.HighWord;
// Move the buttons to the new center
hwndSmaller.MoveWindow(cxClient / 2 - 3 * btnWidth / 2, cyClient / 2 - btnHeight / 2,
btnWidth, btnHeight, true);
hwndLarger.MoveWindow(cxClient / 2 + btnWidth / 2, cyClient / 2 - btnHeight / 2,
btnWidth, btnHeight, true);
return(0);
case WindowMessage.Command:
RECT rc = window.GetWindowRectangle();
// Make the window 10% smaller or larger
switch ((int)(uint)wParam)
{
case ID_SMALLER:
rc.left += cxClient / 20;
rc.right -= cxClient / 20;
rc.top += cyClient / 20;
rc.bottom -= cyClient / 20;
break;
case ID_LARGER:
rc.left -= cxClient / 20;
rc.right += cxClient / 20;
rc.top -= cyClient / 20;
rc.bottom += cyClient / 20;
break;
}
window.MoveWindow(rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, true);
return(0);
case WindowMessage.DrawItem:
DRAWITEMSTRUCT *pdis = (DRAWITEMSTRUCT *)lParam;
// Fill area with white and frame it black
using (DeviceContext dc = pdis->DeviceContext)
{
RECT rect = pdis->rcItem;
dc.FillRectangle(rect, StockBrush.White);
dc.FrameRectangle(rect, StockBrush.Black);
// Draw inward and outward black triangles
int cx = rect.right - rect.left;
int cy = rect.bottom - rect.top;
POINT[] pt = new POINT[3];
switch ((int)pdis->CtlID)
{
case ID_SMALLER:
pt[0].x = 3 * cx / 8; pt[0].y = 1 * cy / 8;
pt[1].x = 5 * cx / 8; pt[1].y = 1 * cy / 8;
pt[2].x = 4 * cx / 8; pt[2].y = 3 * cy / 8;
Triangle(dc, pt);
pt[0].x = 7 * cx / 8; pt[0].y = 3 * cy / 8;
pt[1].x = 7 * cx / 8; pt[1].y = 5 * cy / 8;
pt[2].x = 5 * cx / 8; pt[2].y = 4 * cy / 8;
Triangle(dc, pt);
pt[0].x = 5 * cx / 8; pt[0].y = 7 * cy / 8;
pt[1].x = 3 * cx / 8; pt[1].y = 7 * cy / 8;
pt[2].x = 4 * cx / 8; pt[2].y = 5 * cy / 8;
Triangle(dc, pt);
pt[0].x = 1 * cx / 8; pt[0].y = 5 * cy / 8;
pt[1].x = 1 * cx / 8; pt[1].y = 3 * cy / 8;
pt[2].x = 3 * cx / 8; pt[2].y = 4 * cy / 8;
Triangle(dc, pt);
break;
case ID_LARGER:
pt[0].x = 5 * cx / 8; pt[0].y = 3 * cy / 8;
pt[1].x = 3 * cx / 8; pt[1].y = 3 * cy / 8;
pt[2].x = 4 * cx / 8; pt[2].y = 1 * cy / 8;
Triangle(dc, pt);
pt[0].x = 5 * cx / 8; pt[0].y = 5 * cy / 8;
pt[1].x = 5 * cx / 8; pt[1].y = 3 * cy / 8;
pt[2].x = 7 * cx / 8; pt[2].y = 4 * cy / 8;
Triangle(dc, pt);
pt[0].x = 3 * cx / 8; pt[0].y = 5 * cy / 8;
pt[1].x = 5 * cx / 8; pt[1].y = 5 * cy / 8;
pt[2].x = 4 * cx / 8; pt[2].y = 7 * cy / 8;
Triangle(dc, pt);
pt[0].x = 3 * cx / 8; pt[0].y = 3 * cy / 8;
pt[1].x = 3 * cx / 8; pt[1].y = 5 * cy / 8;
pt[2].x = 1 * cx / 8; pt[2].y = 4 * cy / 8;
Triangle(dc, pt);
break;
}
// Invert the rectangle if the button is selected
if ((pdis->itemState & OwnerDrawStates.Selected) != 0)
{
dc.InvertRectangle(rect);
}
if ((pdis->itemState & OwnerDrawStates.Focus) != 0)
{
rect.left += cx / 16;
rect.top += cy / 16;
rect.right -= cx / 16;
rect.bottom -= cy / 16;
dc.DrawFocusRectangle(rect);
}
}
return(0);
case WindowMessage.Destroy:
Windows.PostQuitMessage(0);
return(0);
}
return(Windows.DefaultWindowProcedure(window, message, wParam, lParam));
}
public DrawItem(LParam lParam)
{
_drawItemStruct = (DRAWITEMSTRUCT *)lParam;
}
