First Commit

libui-ng/windows/text.cpp

@@ -0,0 +1,120 @@
+// 9 april 2015
+#include "uipriv_windows.hpp"
+
+WCHAR *windowTextAndLen(HWND hwnd, LRESULT *len)
+{
+	LRESULT n;
+	WCHAR *text;
+
+	n = SendMessageW(hwnd, WM_GETTEXTLENGTH, 0, 0);
+	if (len != NULL)
+		*len = n;
+	// WM_GETTEXTLENGTH does not include the null terminator
+	text = (WCHAR *) uiprivAlloc((n + 1) * sizeof (WCHAR), "WCHAR[]");
+	// note the comparison: the size includes the null terminator, but the return does not
+	if (GetWindowTextW(hwnd, text, n + 1) != n) {
+		logLastError(L"error getting window text");
+		// on error, return an empty string to be safe
+		*text = L'\0';
+		if (len != NULL)
+			*len = 0;
+	}
+	return text;
+}
+
+WCHAR *windowText(HWND hwnd)
+{
+	return windowTextAndLen(hwnd, NULL);
+}
+
+void setWindowText(HWND hwnd, WCHAR *wtext)
+{
+	if (SetWindowTextW(hwnd, wtext) == 0)
+		logLastError(L"error setting window text");
+}
+
+void uiFreeText(char *text)
+{
+	uiprivFree(text);
+}
+
+int uiWindowsWindowTextWidth(HWND hwnd)
+{
+	LRESULT len;
+	WCHAR *text;
+	HDC dc;
+	HFONT prevfont;
+	SIZE size;
+
+	size.cx = 0;
+	size.cy = 0;
+
+	text = windowTextAndLen(hwnd, &len);
+	if (len == 0)		// no text; nothing to do
+		goto noTextOrError;
+
+	// now we can do the calculations
+	dc = GetDC(hwnd);
+	if (dc == NULL) {
+		logLastError(L"error getting DC");
+		// on any error, assume no text
+		goto noTextOrError;
+	}
+	prevfont = (HFONT) SelectObject(dc, hMessageFont);
+	if (prevfont == NULL) {
+		logLastError(L"error loading control font into device context");
+		ReleaseDC(hwnd, dc);
+		goto noTextOrError;
+	}
+	if (GetTextExtentPoint32W(dc, text, len, &size) == 0) {
+		logLastError(L"error getting text extent point");
+		// continue anyway, assuming size is 0
+		size.cx = 0;
+		size.cy = 0;
+	}
+	// continue on errors; we got what we want
+	if (SelectObject(dc, prevfont) != hMessageFont)
+		logLastError(L"error restoring previous font into device context");
+	if (ReleaseDC(hwnd, dc) == 0)
+		logLastError(L"error releasing DC");
+
+	uiprivFree(text);
+	return size.cx;
+
+noTextOrError:
+	uiprivFree(text);
+	return 0;
+}
+
+char *uiWindowsWindowText(HWND hwnd)
+{
+	WCHAR *wtext;
+	char *text;
+
+	wtext = windowText(hwnd);
+	text = toUTF8(wtext);
+	uiprivFree(wtext);
+	return text;
+}
+
+void uiWindowsSetWindowText(HWND hwnd, const char *text)
+{
+	WCHAR *wtext;
+
+	wtext = toUTF16(text);
+	setWindowText(hwnd, wtext);
+	uiprivFree(wtext);
+}
+
+int uiprivStricmp(const char *a, const char *b)
+{
+	WCHAR *wa, *wb;
+	int ret;
+
+	wa = toUTF16(a);
+	wb = toUTF16(b);
+	ret = _wcsicmp(wa, wb);
+	uiprivFree(wb);
+	uiprivFree(wa);
+	return ret;
+}