所有者绘制按钮强制刷新答案

【问题标题】：Owner Draw Button Force Refresh所有者绘制按钮强制刷新
【发布时间】：2016-06-29 23:57:45
【问题描述】：

我有 4 个所有者绘制按钮，它们用作我的程序的选项卡系统。我遇到的问题是，当我单击其中一个按钮时，我需要更改其他按钮的图像。但是每当我尝试重置图像时，它只会更改我单击的按钮上的图像。有没有什么方法可以在不点击的情况下更改其他按钮上的图像？

INT_PTR CALLBACK Springboard::DlgProc(HWND hDlg, UINT msg, WPARAM wParam, LPARAM lParam){
    static DRAWITEMSTRUCT* pdis;

    switch (msg) {
        case WM_DRAWITEM:

            pdis = (DRAWITEMSTRUCT*) lParam;
            // (winuser.h) Maybe you also want to account for pdis->CtlType (ODT_MENU, ODT_LISTBOX, ODT_COMBOBOX, ODT_BUTTON, ODT_STATIC)
            switch(pdis->CtlID) {
            case IDC_TAB1:
                theSpringboard.myManageOwnerDrawIconButton(pdis, hInstance);
                break;
            case IDC_TAB2:
                theSpringboard.myManageOwnerDrawIconButton(pdis, hInstance);

                break;
            case IDC_TAB3:
                theSpringboard.myManageOwnerDrawIconButton(pdis, hInstance);
                break;
            case IDC_TAB4:
                theSpringboard.myManageOwnerDrawIconButton(pdis, hInstance);
                break;
            case IDC_TAB5:
                theSpringboard.myManageOwnerDrawIconButton(pdis, hInstance);
                break;
        default:
            break;
            }

int Springboard::myManageOwnerDrawIconButton(DRAWITEMSTRUCT* pdis, HINSTANCE hInstance) {
    static RECT rect;
    static HBITMAP hCurrIcon, hSTDc,  hSTDoff, hSTDon, hVFXc, hVFXoff, hVFXon, hCITYc, hCITYoff, hCITYon, hMAXc, hMAXoff, hMAXon, hSETc, hSEToff, hSETon;
    rect = pdis->rcItem;

    hSTDoff = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_STDOFF));
    hSTDon = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_STDON));
    hSTDc = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_STDCLICK));
    hVFXoff = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_VFXOFF));
    hVFXon = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_VFXON));
    hVFXc = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_VFXCLICK));
    hCITYoff = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_CITYOFF));
    hCITYon = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_CITYON));
    hCITYc = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_CITYCLICK));
    hMAXoff = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_MAXOFF));
    hMAXon = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_MAXON));
    hMAXc = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_MAXCLICK));
    hSEToff = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_SETTINGOFF));
    hSETon = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_SETTINGON));
    hSETc = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_SETTINGCLICK));

    if (IDC_TAB1 == pdis->CtlID) {
        // If the button is selected, display the 
        // "active" icon, else the "inactive" icon:

        if (pdis->itemState & ODS_SELECTED) hCurrIcon = hSTDc;
        else hCurrIcon = hSTDoff;
        if(TabRoll == 1) hCurrIcon = hSTDon;
    }

    if (IDC_TAB2 == pdis->CtlID) {
        // If the button is selected, display the 
        // "active" icon, else the "inactive" icon:
        if (pdis->itemState & ODS_SELECTED) hCurrIcon = hVFXc;
        else hCurrIcon = hVFXoff;
        //if(TabRoll == 2) hCurrIcon = hVFXon;
    }

    if (IDC_TAB3 == pdis->CtlID) {
        // If the button is selected, display the 
        // "active" icon, else the "inactive" icon:
        if (pdis->itemState & ODS_SELECTED) hCurrIcon = hCITYc;
        else hCurrIcon = hCITYoff;
        //if(TabRoll == 3) hCurrIcon = hCITYon;
    }

    if (IDC_TAB4 == pdis->CtlID) {
        // If the button is selected, display the 
        // "active" icon, else the "inactive" icon:

        if (pdis->itemState & ODS_SELECTED) hCurrIcon = hMAXc;
        else hCurrIcon = hMAXoff;
        //if(TabRoll == 4) hCurrIcon = hMAXon;
    }

    if (IDC_TAB5 == pdis->CtlID) {
        // If the button is selected, display the 
        // "active" icon, else the "inactive" icon:
        if (pdis->itemState & ODS_SELECTED){ 
            hCurrIcon = hSETc;}
        else{
            hCurrIcon = hSEToff;}
        //if(TabRoll == 5) hCurrIcon = hSETon;
    }

    HDC hdc = CreateCompatibleDC(pdis->hDC);
    SelectObject(hdc, hCurrIcon);

BitBlt(pdis->hDC,0,
        0,ICON_WIDTH,
        ICON_HEIGHT, hdc, 0, 0, SRCCOPY);

        DeleteDC(hdc);

    return(RET_OK);

}

【问题讨论】：

标签： c++ winapi button draw ownerdrawn

【解决方案1】：

你可以简化DlgProc:

INT_PTR CALLBACK Springboard::DlgProc(HWND hDlg, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg)
    {
    case WM_DRAWITEM:
        theSpringboard.myManageOwnerDrawIconButton((DRAWITEMSTRUCT*)lp, hInstance);
        break;
    //...
    return FALSE;
}

在myManageOwnerDrawIconButton 中，您需要进行以下更改：

来自HDC hdc = CreateCompatibleDC(pdis->hDC);

收件人：

HDC hdc = pdis->hDC; 然后你就不需要打电话给DeleteDC(hdc);

更改rect 的声明，它不必是静态的。

RECT rect = pdis->rcItem;

其他静态变量需要初始化一次，这就是静态的重点：

static HBITMAP hCurrIcon = (HBITMAP) LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_something));
//...

ODS_SELECTED 只是表示按钮被按下。您可能希望使用自己的全局变量来手动跟踪按钮、设置选择和删除其他按钮的选择...

ps，我为你的问题添加了winapi标签。

【讨论】：