public Create(LParam lParam)
{
_createStruct = (CREATESTRUCT *)lParam;
}
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));
}
