1 files changed, 39 insertions, 0 deletions
diff --git a/prev/container_windows.c b/prev/container_windows.c
new file mode 100644
index 0000000..bbad9ec
--- /dev/null
+++ b/prev/container_windows.c
@@ -0,0 +1,39 @@
+// 17 july 2014
+
+#include "winapi_windows.h"
+#include "_cgo_export.h"
+
+RECT containerBounds(HWND hwnd)
+{
+	RECT r;
+
+	if (GetClientRect(hwnd, &r) == 0)
+		xpanic("error getting container client rect for container.bounds()", GetLastError());
+	return r;
+}
+
+void calculateBaseUnits(HWND hwnd, int *baseX, int *baseY, LONG *internalLeading)
+{
+	HDC dc;
+	HFONT prevFont;
+	TEXTMETRICW tm;
+	SIZE size;
+
+	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());
+	if (GetTextExtentPoint32W(dc, L"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", 52, &size) == 0)
+		xpanic("error getting text extent point for preferred size calculations", GetLastError());
+	*baseX = (int) ((size.cx / 26 + 1) / 2);
+	*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());
+}