Implemented container.bounds() on Windows.

newctrl/container_windows.c

@@ -57,6 +57,15 @@ HWND newContainer(void)
 	return hwnd;
 }
 
+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;

newctrl/container_windows.go

@@ -57,6 +57,11 @@ func (c *container) parent() *controlParent {
 	return &controlParent{c.hwnd}
 }
 
+func (c *container) bounds(d *sizing) (int, int, int, int) {
+	r := C.containerBounds(c.hwnd)
+	return int(r.left), int(r.top), int(r.right - r.left), int(r.bottom - r.top)
+}
+
 // For Windows, Microsoft just hands you a list of preferred control sizes as part of the MSDN documentation and tells you to roll with it.
 // These sizes are given in "dialog units", which are independent of the font in use.
 // We need to convert these into standard pixels, which requires we get the device context of the OS window.

newctrl/winapi_windows.h

@@ -125,6 +125,7 @@ extern void tableSelectItem(HWND, intptr_t);
 #define containerclass L"gouicontainer"
 extern DWORD makeContainerWindowClass(char **);
 extern HWND newContainer();
+extern RECT containerBounds(HWND);
 extern void calculateBaseUnits(HWND, int *, int *, LONG *);
 
 // area_windows.c