是否可以使用WinAPI命令在窗口内创建具有透明背景的标签?使用WinAPI创建带透明背景的文本标签
我想添加一个图像到一个对话窗口,将作为背景图像,然后在该图像上显示文本。到目前为止,我尝试过的所有内容都会在背景图片的顶部显示文字标签,并在其周围绘制一个灰色矩形。
这是我的代码示例到目前为止(显示在对话框的整个邮件处理程序):
INT_PTR CALLBACK OfferWindowProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
HWND hWndBackground;
HWND hWndLabel;
HBRUSH hLabelBackColour = NULL;
HFONT hfFont;
HWND hWndTitleLabel;
HDC hdcStatic = NULL;
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
//Load the background image
HANDLE hBitmap;
hBitmap = LoadImage(NULL, L"C:\\Users\\DavidHall\\Documents\\bg.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
if (hBitmap != NULL)
{
hWndBackground = CreateWindow(L"STATIC", L"image box", WS_CHILD | WS_VISIBLE | SS_BITMAP, 0, 0, 100, 100, hDlg, (HMENU) 2000, NULL, NULL);
SendMessage(hWndBackground, STM_SETIMAGE, IMAGE_BITMAP, LPARAM(hBitmap));
}
// Create the label using CreateWindowEx
hfFont = CreateFont(20, 0, 0, 0, fontWeight, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, ANTIALIASED_QUALITY,
DEFAULT_PITCH, L"Verdana");
hWndTitleLabel = CreateWindowEx(WS_EX_TRANSPARENT, L"STATIC", L"", WS_CHILD | WS_VISIBLE | SS_LEFT | WS_SYSMENU , xPos, yPos, width, height, hwnd, (HMENU) id, hInst, NULL);
SendMessage(hWndTitleLabel, WM_SETTEXT, NULL, (LPARAM) labelText.c_str());
SendMessage(hWndTitleLabel, WM_SETFONT, (WPARAM)hfFont, NULL);
return (INT_PTR)TRUE;
case WM_CLOSE:
EndDialog(hDlg, LOWORD(wParam));
// Delete the brush - is that correct?
DeleteObject(hLabelBackColour);
return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
default:
break;
}
return (INT_PTR)FALSE;
}
我试过的东西的各种组合,包括:
SetLayeredWindowAttributes
SetBkMode(hdc, TRANSPARENT)
- 处理
WM_CTLCOLORSTATIC
消息
关于这个问题的一个注意事项是,我使用的是WinAPI,因为文件大小非常小是该项目的必备条件 - 任何与WinAPI可执行文件大小相当的GUI框架建议都是值得欢迎的! –