1 files changed, 96 insertions, 0 deletions
diff --git a/container_windows.c b/container_windows.c
new file mode 100644
index 0000000..a95818d
--- /dev/null
+++ b/container_windows.c
@@ -0,0 +1,96 @@
+// 17 july 2014
+
+#include "winapi_windows.h"
+#include "_cgo_export.h"
+
+/*
+This could all just be part of Window, but doing so just makes things complex.
+In this case, I chose to waste a window handle rather than keep things super complex.
+If this is seriously an issue in the future, I can roll it back.
+*/
+
+#define containerclass L"gouicontainer"
+
+static LRESULT CALLBACK containerWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
+{
+	void *data;
+	RECT r;
+	LRESULT lResult;
+
+	data = getWindowData(hwnd, uMsg, wParam, lParam, &lResult, storeContainerHWND);
+	if (data == NULL)
+		return lResult;
+	if (sharedWndProc(hwnd, uMsg, wParam, lParam, &lResult))
+		return lResult;
+	switch (uMsg) {
+	case WM_SIZE:
+		if (GetClientRect(hwnd, &r) == 0)
+			xpanic("error getting client rect for Window in WM_SIZE", GetLastError());
+		containerResize(data, &r);
+		return 0;
+	default:
+		return DefWindowProcW(hwnd, uMsg, wParam, lParam);
+	}
+	xmissedmsg("container", "containerWndProc()", uMsg);
+	return 0;		// unreached
+}
+
+DWORD makeContainerWindowClass(char **errmsg)
+{
+	WNDCLASSW wc;
+
+	ZeroMemory(&wc, sizeof (WNDCLASSW));
+	wc.lpfnWndProc = containerWndProc;
+	wc.hInstance = hInstance;
+	wc.hIcon = hDefaultIcon;
+	wc.hCursor = hArrowCursor;
+	wc.hbrBackground = NULL;//(HBRUSH) (COLOR_BTNFACE + 1);
+	wc.lpszClassName = containerclass;
+	if (RegisterClassW(&wc) == 0) {
+		*errmsg = "error registering container window class";
+		return GetLastError();
+	}
+	return 0;
+}
+
+HWND newContainer(void *data)
+{
+	HWND hwnd;
+
+	hwnd = CreateWindowExW(
+		WS_EX_CONTROLPARENT | WS_EX_TRANSPARENT,
+		containerclass, L"",
+		WS_CHILD | WS_VISIBLE,
+		CW_USEDEFAULT, CW_USEDEFAULT,
+		100, 100,
+		msgwin, NULL, hInstance, data);
+	if (hwnd == NULL)
+		xpanic("container creation failed", GetLastError());
+	return hwnd;
+}
+
+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());
+}