难以从CImageList设置菜单项位图
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我有一个菜单，在某种情况下提示。我有一个位图图像，其中包含我想要添加到菜单中的图标。 首先，我加载图像列表如下：
CImageList imageList;
imageList.Create(18, 16, ILC_COLOR24|ILC_MASK, 0, 0)
CBitmap bitmap;
bitmap.LoadBitmap(IDR_CL2_TAB_MENU_OPTIONS);
imageList.Add(&bitmap, RGB(192, 192, 192));
第二，我尝试使用以下内容提取位图以添加到菜单中
IMAGEINFO imgInfo;
ImgList.GetImageInfo( nBmpNo, &imgInfo );
pMenu->SetMenuItemBitmaps(iItem, MF_BYPOSITION, CBitmap::FromHandle( imgInfo.hbmImage ), NULL);
但不幸的是，它没有用，所以我尝试了这里写的代码https://www.codeproject.com/Articles/4673/Extracting-Single-Images-from-a-CImageList-object
但它只给我菜单中的黑色图标。 这是我显示菜单的完整功能：
void CMainFrame::ShowTabOptions(CPoint point)
{
CMenu Menu, *pMenu = NULL;
if (!Menu.LoadMenu (IDR_POPUP_TAB_OPTIONS))
return;
pMenu = Menu.GetSubMenu(0);
if (NULL == pMenu)
return;
CImageList imageList;
if(!imageList.Create(18, 16, ILC_COLOR24|ILC_MASK, 0, 0))
return;
CBitmap bitmap;
bitmap.LoadBitmap(IDR_CL2_TAB_MENU_OPTIONS);
imageList.Add(&bitmap, RGB(192, 192, 192));
CArray<CBitmap*, CBitmap*> bitmapArray;
CBitmap b1, b2, b3, b4, b5, b6, b7, b8, b9;
bitmapArray.Add(&b1);
bitmapArray.Add(&b2);
bitmapArray.Add(&b3);
bitmapArray.Add(&b4);
bitmapArray.Add(&b5);
bitmapArray.Add(&b6);
bitmapArray.Add(&b7);
bitmapArray.Add(&b8);
bitmapArray.Add(&b9);
for (int iItem = 0; iItem < 9; iItem++)
{
imageList.Copy( 0, iItem, ILCF_SWAP );
IMAGEINFO imageInfo;
imageList.GetImageInfo(0,&imageInfo);
CDC dc;
dc.CreateCompatibleDC (GetWindowDC());
CRect rect (imageInfo.rcImage);
bitmapArray.GetAt(iItem)->CreateCompatibleBitmap (this->GetWindowDC(), rect.Width (), rect.Height ());
CBitmap* pOldBmp = dc.SelectObject (bitmapArray.GetAt(iItem));
imageList.DrawIndirect (&dc, 0, CPoint (0, 0), CSize (rect.Width (), rect.Height ()), CPoint (0, 0)/*, ILD_NORMAL, SRCCOPY, RGB(255, 255, 255)*/);
dc.SelectObject (pOldBmp);
pMenu->SetMenuItemBitmaps(iItem, MF_BYPOSITION, bitmapArray.GetAt(iItem), NULL);
}
pMenu->TrackPopupMenu (TPM_LEFTALIGN | TPM_VCENTERALIGN | TPM_LEFTBUTTON, point.x, point.y, this, NULL);
Menu.DestroyMenu ();
for (int iIndex = 0; iIndex < bitmapArray.GetCount(); iIndex ++)
{
bitmapArray.GetAt(iIndex)->DeleteObject();
}
}
谁能告诉我我错过了什么？ 提前致谢
答案
所以，这就是我实际做到的方式：
Step 1
我有一个变量定义我的班级：
MenuBitmapsMap m_mapMenuBitmap;
这是在标题中：
using MenuBitmapsMap = map<UINT, CBitmap>;
Step 2
我班上有这个方法：
void CCreateReportDlg::AddMenuBitmaps()
{
CMenu*pMenu = GetMenu();
if (pMenu == nullptr)
return;
m_mapMenuBitmap.clear();
// File menu
UpdateMenuBitmap(pMenu, ID_FILE_SAVE, IDB_BMP_MENU_SAVE);
UpdateMenuBitmap(pMenu, ID_FILE_SAVEASFILE, IDB_BMP_MENU_SAVE_AS);
UpdateMenuBitmap(pMenu, ID_FILE_PRINT, IDB_BMP_MENU_PRINT);
UpdateMenuBitmap(pMenu, ID_FILE_IMPORT_FROM_OCLM_ASSIGNMENT_HISTORY, IDB_BMP_MENU_IMPORT);
UpdateMenuBitmap(pMenu, ID_FILE_EXPORT, IDB_BMP_MENU_EXPORT);
UpdateMenuBitmap(pMenu, ID_FILE_EXPORTSETTINGS, IDB_BMP_MENU_SETTINGS);
UpdateMenuBitmap(pMenu, ID_FILE_PRINT_PREVIEW, IDB_BMP_MENU_PRINT_PREVIEW);
UpdateMenuBitmap(pMenu, ID_FILE_AVAILABILITY_REPORT, IDB_BMP_MENU_REPORT);
// Auto menu
UpdateMenuBitmap(pMenu, ID_AUTOASSIGN_AUTO_ASSIGN, IDB_BMP_MENU_AUTO_ASSIGN);
UpdateMenuBitmap(pMenu, ID_AUTOASSIGN_SELECTED_COLUMN, IDB_BMP_MENU_COLUMNS);
UpdateMenuBitmap(pMenu, ID_AUTOASSIGN_SETTINGS, IDB_BMP_MENU_SETTINGS);
UpdateMenuBitmap(pMenu, ID_AUTOASSIGN_CLEAR_ASSIGNMENTS, IDB_BMP_MENU_CLEAR);
UpdateMenuBitmap(pMenu, ID_AUTOASSIGN_SELECTED_COLUMN, IDB_BMP_MENU_COLUMNS);
UpdateMenuBitmap(pMenu, ID_AUTOASSIGN_EXCLUSIONS, IDB_BMP_MENU_EXCLUSIONS);
UpdateMenuBitmap(pMenu, ID_AUTOASSIGN_SELECTED_COLUMN, IDB_BMP_MENU_COLUMNS);
UpdateMenuBitmap(pMenu, ID_AUTOASSIGN_SHOW_CONFLICTS, IDB_BMP_MENU_HIGHLIGHT);
// Help menu
UpdateMenuBitmap(pMenu, ID_HELP_HELP, IDB_BMP_MENU_HELP);
}
上面的方法在OnInitDialog中调用。
Step 3
这是UpdatemenuBitmap的定义：
void CCreateReportDlg::UpdateMenuBitmap(CMenu *pMenu, UINT uCommandID, UINT uBMPResource,
bool bByPosition /*false*/, bool bDisabled /*false*/)
{
if (pMenu == nullptr)
return;
// We are working on the "actual" bitmap object held in the map
CBitmap& bitmap = m_mapMenuBitmap[uCommandID];
if (bitmap.GetSafeHandle() != nullptr)
bitmap.DeleteObject();
if (bitmap.LoadBitmap(uBMPResource) == NULL)
return;
theApp.SetBitmapBackgroundAsMenuColour(bitmap);
if (bDisabled)
theApp.SetBitmapAsGrayScale(bitmap);
if (!pMenu->SetMenuItemBitmaps(uCommandID,
bByPosition ? MF_BYPOSITION : MF_BYCOMMAND,
&bitmap,
&bitmap))
{
// #UpdateMenuBitmap Failed to set the menu item bitmaps
}
}
我没有提供其他两种方法，因为它们与我不认为的问题没有直接关系。如果需要，我可以添加答案。
当你查看SetMenuItemBitmaps的文档时，它指出：
当菜单被销毁时，这些位图不会被破坏;由应用程序来销毁它们。
在您的代码中，您将在方法中创建CImageList。将其添加为成员变量，以便在显示菜单时对象保持有效。然后，在OnDestroy中销毁您的图像列表（资源图像可能不需要）。
Update
以下是我在app类中的额外方法：
void CMeetingScheduleAssistantApp::SetBitmapBackgroundAsMenuColour(HBITMAP hbmp)
{
UpdateBitmapBackground(hbmp, true);
}
void CMeetingScheduleAssistantApp::SetBitmapAsGrayScale(HBITMAP hbmp)
{
UpdateBitmapBackground(hbmp, false);
}
void CMeetingScheduleAssistantApp::UpdateBitmapBackground(HBITMAP hbmp, bool enabled, COLORREF crBackground /* GetSysColor(COLOR_MENU) */)
{
if (!hbmp)
return;
HDC memdc = CreateCompatibleDC(nullptr);
BITMAP bm;
::GetObject(hbmp, sizeof(bm), &bm);
int w = bm.bmWidth;
int h = bm.bmHeight;
BITMAPINFO bi = { sizeof(BITMAPINFOHEADER), w, h, 1, 32, BI_RGB };
std::vector<uint32_t> pixels(w * h);
GetDIBits(memdc, hbmp, 0, h, &pixels[0], &bi, DIB_RGB_COLORS);
//assume that the color at (0,0) is the background color
uint32_t old_color = pixels[0];
//this is the new background color
uint32_t bk = crBackground;
//swap RGB with BGR
uint32_t new_color = RGB(GetBValue(bk), GetGValue(bk), GetRValue(bk));
//define lambda functions to swap between BGR and RGB
auto bgr_r = [](uint32_t color) { return GetBValue(color); };
auto bgr_g = [](uint32_t color) { return GetGValue(color); };
auto bgr_b = [](uint32_t color) { return GetRValue(color); };
BYTE new_red = bgr_r(new_color);
BYTE new_grn = bgr_g(new_color);
BYTE new_blu = bgr_b(new_color);
//change background and modify disabled bitmap
for (auto &p : pixels)
{
if (p == old_color)
{
p = new_color;
}
else if (!enabled)
{
//blend color with background, similar to 50% alpha
BYTE red = (bgr_r(p) + new_red) / 2;
BYTE grn = (bgr_g(p) + new_grn) / 2;
BYTE blu = (bgr_b(p) + new_blu) / 2;
p = RGB(blu, grn, red); //<= BGR/RGB swap
}
}
//fix corner edges
for (int row = h - 2; row >= 1; row--)
{
for (int col = 1; col < w - 1; col++)
{
int i = row * w + col;
if (pixels[i] != new_color)
{
//check the color of neighboring pixels:
//if that pixel has background color,
//then that pixel is the background
bool l = pixels[i - 1] == new_color; //left pixel is background
bool r = pixels[i + 1] == new_color; //right ...
bool t = pixels[i - w] == new_color; //top ...
bool b = pixels[i + w] == new_color; //bottom ...
//we are on a corner pixel if:
//both left-pixel and top-pixel are background or
//both left-pixel and bottom-pixel are background or
//both right-pixel and bottom-pixel are background or
//both right-pixel and bottom-pixel are background
if (l && t || l && b || r && t || r && b)
{
//blend corner pixel with background
BYTE red = (bgr_r(pixels[i]) + new_red) / 2;
BYTE grn = (bgr_g(pixels[i]) + new_grn) / 2;
BYTE blu = (bgr_b(pixels[i]) + new_blu) / 2;
pixels[i] = RGB(blu, grn, red);//<= BGR/RGB swap
}
}
}
}
SetDIBits(memdc, hbmp, 0, h, &pixels[0], &bi, DIB_RGB_COLORS);
DeleteDC(memdc);
}
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