84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
// 6 april 2015
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#include "uipriv_windows.h"
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intmax_t uiWindowsWindowTextWidth(HWND hwnd)
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{
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LRESULT len;
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WCHAR *text;
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HDC dc;
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HFONT prevfont;
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SIZE size;
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size.cx = 0;
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size.cy = 0;
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// first we need the window text
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len = SendMessageW(hwnd, WM_GETTEXTLENGTH, 0, 0);
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if (len == 0) // no text; nothing to do
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return 0;
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text = (WCHAR *) uiAlloc((len + 1) * sizeof (WCHAR));
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// note the comparison: the size includes the null terminator, but the return does not
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if (GetWindowText(hwnd, text, len + 1) != len)
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logLastError("error getting window text in uiWindowsWindowTextWidth()");
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// now we can do the calculations
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dc = GetDC(hwnd);
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if (dc == NULL)
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logLastError("error getting DC in uiWindowsWindowTextWidth()");
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prevfont = (HFONT) SelectObject(dc, hMessageFont);
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if (prevfont == NULL)
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logLastError("error loading control font into device context in uiWindowsWindowTextWidth()");
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if (GetTextExtentPoint32W(dc, text, len, &size) == 0)
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logLastError("error getting text extent point in uiWindowsWindowTextWidth()");
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if (SelectObject(dc, prevfont) != hMessageFont)
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logLastError("error restoring previous font into device context in uiWindowsWindowTextWidth()");
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if (ReleaseDC(hwnd, dc) == 0)
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logLastError("error releasing DC in uiWindowsWindowTextWidth()");
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uiFree(text);
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return size.cx;
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}
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// this is a helper function that takes the logic of determining window classes and puts it all in one place
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// there are a number of places where we need to know what window class an arbitrary handle has
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// theoretically we could use the class atom to avoid a _wcsicmp()
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// however, raymond chen advises against this - http://blogs.msdn.com/b/oldnewthing/archive/2004/10/11/240744.aspx (and we're not in control of the Tab class, before you say anything)
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// usage: windowClassOf(hwnd, L"class 1", L"class 2", ..., NULL)
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int windowClassOf(HWND hwnd, ...)
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{
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// MSDN says 256 is the maximum length of a class name; add a few characters just to be safe (because it doesn't say whether this includes the terminating null character)
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#define maxClassName 260
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WCHAR classname[maxClassName + 1];
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va_list ap;
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WCHAR *curname;
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int i;
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if (GetClassNameW(hwnd, classname, maxClassName) == 0)
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logLastError("error getting name of window class in windowClassOf()");
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va_start(ap, hwnd);
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i = 0;
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for (;;) {
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curname = va_arg(ap, WCHAR *);
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if (curname == NULL)
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break;
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if (_wcsicmp(classname, curname) == 0) {
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va_end(ap);
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return i;
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}
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i++;
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}
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// no match
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va_end(ap);
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return -1;
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}
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void complain(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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abort();
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}
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