public void GetSystemColorBrush()
{
// System color brushes are special- they'll always give the same value
BrushHandle brush = GdiMethods.GetSystemColorBrush(SystemColor.MenuBar);
long handle = (long)brush.DangerousGetHandle();
handle = handle & 0xFFFF00;
// This changed in RS4 from C5 to BF for the last byte. Checking the first
// bytes to make sure we're in the right ballpark.
handle.Should().Be(0x100000);
}
static unsafe LRESULT WindowProcedure(WindowHandle window, WindowMessage message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WindowMessage.Create:
ModuleInstance hInstance = window.GetWindowLong(WindowLong.InstanceHandle);
// Create the white-rectangle window against which the
// scroll bars will be positioned. The child window ID is 9.
hwndRect = Windows.CreateWindow("static", null,
WindowStyles.Child | WindowStyles.Visible | (WindowStyles)StaticStyles.WhiteRectangle,
ExtendedWindowStyles.None,
0, 0, 0, 0,
window, (IntPtr)9, hInstance, IntPtr.Zero);
for (int i = 0; i < 3; i++)
{
// The three scroll bars have IDs 0, 1, and 2, with
// scroll bar ranges from 0 through 255.
hwndScroll[i] = Windows.CreateWindow("scrollbar", null,
WindowStyles.Child | WindowStyles.Visible | WindowStyles.TabStop | (WindowStyles)ScrollBarStyles.Veritcal,
ExtendedWindowStyles.None,
0, 0, 0, 0,
window, (IntPtr)i, hInstance, IntPtr.Zero);
hwndScroll[i].SetScrollRange(ScrollBar.Control, 0, 255, false);
hwndScroll[i].SetScrollPosition(ScrollBar.Control, 0, false);
// The three color-name labels have IDs 3, 4, and 5,
// and text strings “Red”, “Green”, and “Blue”.
hwndLabel[i] = Windows.CreateWindow("static", szColorLabel[i],
WindowStyles.Child | WindowStyles.Visible | (WindowStyles)StaticStyles.Center,
ExtendedWindowStyles.None,
0, 0, 0, 0,
window, (IntPtr)i + 3, hInstance, IntPtr.Zero);
// The three color-value text fields have IDs 6, 7,
// and 8, and initial text strings of “0”.
hwndValue[i] = Windows.CreateWindow("static", "0",
WindowStyles.Child | WindowStyles.Visible | (WindowStyles)StaticStyles.Center,
ExtendedWindowStyles.None,
0, 0, 0, 0,
window, (IntPtr)i + 6, hInstance, IntPtr.Zero);
OldScroll[i] = hwndScroll[i].SetWindowProcedure(s_ScrollProcedure);
hBrush[i] = Windows.CreateSolidBrush(crPrim[i]);
}
hBrushStatic = Windows.GetSystemColorBrush(SystemColor.ButtonHighlight);
cyChar = Windows.GetDialogBaseUnits().cy;
return(0);
case WindowMessage.Size:
int cxClient = lParam.LowWord;
int cyClient = lParam.HighWord;
rcColor = new RECT(cxClient / 2, 0, cxClient, cyClient);
hwndRect.MoveWindow(0, 0, cxClient / 2, cyClient, true);
for (int i = 0; i < 3; i++)
{
hwndScroll[i].MoveWindow((2 * i + 1) * cxClient / 14, 2 * cyChar,
cxClient / 14, cyClient - 4 * cyChar, true);
hwndLabel[i].MoveWindow((4 * i + 1) * cxClient / 28, cyChar / 2,
cxClient / 7, cyChar, true);
hwndValue[i].MoveWindow((4 * i + 1) * cxClient / 28, cyClient - 3 * cyChar / 2,
cxClient / 7, cyChar, true);
}
window.SetFocus();
return(0);
case WindowMessage.SetFocus:
hwndScroll[idFocus].SetFocus();
return(0);
case WindowMessage.VerticalScroll:
int id = (int)((WindowHandle)lParam).GetWindowLong(WindowLong.Id);
switch ((ScrollCommand)wParam.LowWord)
{
case ScrollCommand.PageDown:
color[id] += 15;
goto case ScrollCommand.LineDown;
case ScrollCommand.LineDown:
color[id] = Math.Min(255, color[id] + 1);
break;
case ScrollCommand.PageUp:
color[id] -= 15;
goto case ScrollCommand.LineUp;
case ScrollCommand.LineUp:
color[id] = Math.Max(0, color[id] - 1);
break;
case ScrollCommand.Top:
color[id] = 0;
break;
case ScrollCommand.Bottom:
color[id] = 255;
break;
case ScrollCommand.ThumbPosition:
case ScrollCommand.ThumbTrack:
color[id] = wParam.HighWord;
break;
default:
return(0);
}
hwndScroll[id].SetScrollPosition(ScrollBar.Control, color[id], true);
hwndValue[id].SetWindowText(color[id].ToString());
BrushHandle brush = Windows.CreateSolidBrush((byte)color[0], (byte)color[1], (byte)color[2]);
brush.SetHandleAsInvalid(); // We'll dispose when we set the next brush
window.SetClassBackgroundBrush(brush).Dispose();
window.InvalidateRectangle(rcColor, true);
return(0);
case WindowMessage.ControlColorScrollBar:
return((IntPtr)hBrush[(int)((WindowHandle)lParam).GetWindowLong(WindowLong.Id)]);
case WindowMessage.ControlColorStatic:
id = (int)((WindowHandle)lParam).GetWindowLong(WindowLong.Id);
if (id >= 3 && id <= 8)
{
DeviceContext dc = new DeviceContext((IntPtr)wParam, false);
dc.SetTextColor(crPrim[id % 3]);
dc.SetBackgroundColor(Windows.GetSystemColor(SystemColor.ButtonHighlight));
return(hBrushStatic.DangerousGetHandle());
}
break;
case WindowMessage.SystemColorChange:
hBrushStatic = Windows.GetSystemColorBrush(SystemColor.ButtonHighlight);
return(0);
case WindowMessage.Destroy:
window.SetClassBackgroundBrush(StockBrush.White).Dispose();
for (int i = 0; i < 3; i++)
{
hBrush[i].Dispose();
}
Windows.PostQuitMessage(0);
return(0);
}
return(Windows.DefaultWindowProcedure(window, message, wParam, lParam));
}
/// <summary> /// Sets the background brush for the window class. Returns the previous background brush. /// </summary> /// <param name="ownsHandle"> /// Whether or not the returned brush should own the handle. If true the brush handle /// will be deleted when disposed / finalized. /// </param> public static BrushHandle SetClassBackgroundBrush(this WindowHandle window, BrushHandle brush, bool ownsHandle = true) => new BrushHandle(window.SetClassLong(ClassLong.BackgroundBrush, brush.DangerousGetHandle()), ownsHandle);
