Question

有没有办法使按钮内的文本水平和垂直居中对齐？

case WM_DRAWITEM:
        {
            LPDRAWITEMSTRUCT Item;
            Item = (LPDRAWITEMSTRUCT)lParam;

            SelectObject(Item->hDC, CreateFont(17, 0, 0, 0, FW_NORMAL, 0, 0, 0, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH, "Arial Black"));

            FillRect(Item->hDC, &Item->rcItem, CreateSolidBrush(0xE0E0E0) );

            SetBkMode(Item->hDC, 0xE0E0E0);
            SetTextColor(Item->hDC, RGB(255,255,255));

            int len;
            len = GetWindowTextLength(Item->hwndItem);
            LPSTR lpBuff;
            lpBuff = new char[len+1];
            GetWindowTextA(Item->hwndItem, lpBuff, len+1);
            DrawTextA(Item->hDC, lpBuff, len, &Item->rcItem, DT_CENTER);
        }
    break;

Answer 1

您已经在使用DT_CENTER标志将文本水平居中。 DrawText()还具有DT_VCENTER和DT_SINGLELINE标志，以使文本垂直居中。只需将标志结合在一起即可。

此外，您还有资源和内存泄漏。您正在从HFONT泄漏CreateFont()，从HBRUSH泄漏CreateSolidBrush()，并且从new[]泄漏文本缓冲区。使用完后，您需要释放它们。

尝试一下：

case WM_DRAWITEM:
    {
        LPDRAWITEMSTRUCT Item = reinterpret_cast<LPDRAWITEMSTRUCT>(lParam);

        HFONT hFont = CreateFont(17, 0, 0, 0, FW_NORMAL, 0, 0, 0, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH, TEXT("Arial Black"));
        HFONT hOldFont = (HFONT) SelectObject(Item->hDC, hFont);

        HBRUSH hBrush = CreateSolidBrush(RGB(0xE0, 0xE0, 0xE0));
        FillRect(Item->hDC, &Item->rcItem, hBrush);
        DeleteObject(hBrush);

        SetBkMode(Item->hDC, TRANSPARENT); // <-- 0xE0E0E0 was not a valid mode value!
        SetTextColor(Item->hDC, RGB(255,255,255));

        int len = GetWindowTextLength(Item->hwndItem) + 1;
        LPTSTR lpBuff = new TCHAR[len];
        len = GetWindowText(Item->hwndItem, lpBuff, len);
        DrawText(Item->hDC, lpBuff, len, &Item->rcItem, DT_CENTER | DT_VCENTER | DT_SINGLELINE);
        delete[] lpBuff;

        SelectObject(Item->hDC, hOldFont);
        DeleteObject(hFont);
    }
    break;

Answer 2

来自https://docs.microsoft.com/en-us/windows/desktop/Controls/button-styles

可能需要使用import random while True: dice_number = random.randint(1, 6) print('You rolled ' + str(dice_number)) print("Do you wish to continue? [Y/n]" ) if input() == 'Y' or 'y': pass else: break来完成您正在描述的事情。

Win API对齐按钮上的文本

2 个答案: