Win API对齐按钮上的文本 [英] Win API Aligning text on a button

问题描述

有没有一种方法可以使按钮内的文本水平和垂直居中对齐？

Is there a way to center align the text inside a button both horizontally and vertically?

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;

推荐答案

您已经在使用 DT_CENTER 标志可将文本水平居中。 DrawText（）还具有 DT_VCENTER 和 DT_SINGLELINE 标志居中垂直文本。只需将标志组合在一起即可。

You are already using the DT_CENTER flag to center the text horizontally. DrawText() also has DT_VCENTER and DT_SINGLELINE flags to center the text vertically. Simply combine the flags together.

此外，您还有资源和内存泄漏。您正在从 CreateFont（）， HBRUSH HFONT >来自 CreateSolidBrush（），而文本缓冲区来自 new [] 。使用完它们后，您需要释放它们。

Also, you have resource and memory leaks. You are leaking the HFONT from CreateFont(), the HBRUSH from CreateSolidBrush(), and the text buffer from new[]. You need to free them all when you are done using them.

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;

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