Settled the placement of functions formerly in sizing_windows.c and updated the winapi_windows.h header file to suit.

1 files changed, 23 insertions, 0 deletions

diff --git a/redo/container_windows.c b/redo/container_windows.c
index f568440..5f71fe2 100644
--- a/redo/container_windows.c
+++ b/redo/container_windows.c
@@ -82,3 +82,26 @@ HWND newContainer(void *data)
 		xpanic("container creation failed", GetLastError());
 	return hwnd;
 }
+
+void calculateBaseUnits(HWND hwnd, int *baseX, int *baseY, LONG *internalLeading)
+{
+	HDC dc;
+	HFONT prevFont;
+	TEXTMETRICW tm;
+
+	dc = GetDC(hwnd);
+	if (dc == NULL)
+		xpanic("error getting DC for preferred size calculations", GetLastError());
+	prevFont = (HFONT) SelectObject(dc, controlFont);
+	if (prevFont == NULL)
+		xpanic("error loading control font into device context for preferred size calculation", GetLastError());
+	if (GetTextMetricsW(dc, &tm) == 0)
+		xpanic("error getting text metrics for preferred size calculations", GetLastError());
+	*baseX = (int) tm.tmAveCharWidth;		/* TODO not optimal; third reference below has better way */
+	*baseY = (int) tm.tmHeight;
+	*internalLeading = tm.tmInternalLeading;
+	if (SelectObject(dc, prevFont) != controlFont)
+		xpanic("error restoring previous font into device context after preferred size calculations", GetLastError());
+	if (ReleaseDC(hwnd, dc) == 0)
+		xpanic("error releasing DC for preferred size calculations", GetLastError());
+}