1 files changed, 144 insertions, 0 deletions
diff --git a/src/libui_sdl/libui/windows/parent.cpp b/src/libui_sdl/libui/windows/parent.cpp
new file mode 100644
index 0000000..bde6fb9
--- /dev/null
+++ b/src/libui_sdl/libui/windows/parent.cpp
@@ -0,0 +1,144 @@
+// 26 april 2015
+#include "uipriv_windows.hpp"
+
+// This contains code used by all uiControls that contain other controls.
+// It also contains the code to draw the background of a container.c container, as that is a variant of the WM_CTLCOLORxxx handler code.
+
+static HBRUSH parentBrush = NULL;
+
+static HWND parentWithBackground(HWND hwnd)
+{
+	HWND parent;
+	int cls;
+
+	parent = hwnd;
+	for (;;) {
+		parent = parentOf(parent);
+		// skip groupboxes; they're (supposed to be) transparent
+		// skip uiContainers; they don't draw anything
+		cls = windowClassOf(parent, L"button", containerClass, NULL);
+		if (cls != 0 && cls != 1)
+			break;
+	}
+	return parent;
+}
+
+struct parentDraw {
+	HDC cdc;
+	HBITMAP bitmap;
+	HBITMAP prevbitmap;
+};
+
+static HRESULT parentDraw(HDC dc, HWND parent, struct parentDraw *pd)
+{
+	RECT r;
+
+	uiWindowsEnsureGetClientRect(parent, &r);
+	pd->cdc = CreateCompatibleDC(dc);
+	if (pd->cdc == NULL)
+		return logLastError(L"error creating compatible DC");
+	pd->bitmap = CreateCompatibleBitmap(dc, r.right - r.left, r.bottom - r.top);
+	if (pd->bitmap == NULL)
+		return logLastError(L"error creating compatible bitmap");
+	pd->prevbitmap = (HBITMAP) SelectObject(pd->cdc, pd->bitmap);
+	if (pd->prevbitmap == NULL)
+		return logLastError(L"error selecting bitmap into compatible DC");
+	SendMessageW(parent, WM_PRINTCLIENT, (WPARAM) (pd->cdc), PRF_CLIENT);
+	return S_OK;
+}
+
+static void endParentDraw(struct parentDraw *pd)
+{
+	// continue in case of any error
+	if (pd->prevbitmap != NULL)
+		if (((HBITMAP) SelectObject(pd->cdc, pd->prevbitmap)) != pd->bitmap)
+			logLastError(L"error selecting previous bitmap back into compatible DC");
+	if (pd->bitmap != NULL)
+		if (DeleteObject(pd->bitmap) == 0)
+			logLastError(L"error deleting compatible bitmap");
+	if (pd->cdc != NULL)
+		if (DeleteDC(pd->cdc) == 0)
+			logLastError(L"error deleting compatible DC");
+}
+
+// see http://www.codeproject.com/Articles/5978/Correctly-drawn-themed-dialogs-in-WinXP
+static HBRUSH getControlBackgroundBrush(HWND hwnd, HDC dc)
+{
+	HWND parent;
+	RECT hwndScreenRect;
+	struct parentDraw pd;
+	HBRUSH brush;
+	HRESULT hr;
+
+	parent = parentWithBackground(hwnd);
+
+	hr = parentDraw(dc, parent, &pd);
+	if (hr != S_OK)
+		return NULL;
+	brush = CreatePatternBrush(pd.bitmap);
+	if (brush == NULL) {
+		logLastError(L"error creating pattern brush");
+		endParentDraw(&pd);
+		return NULL;
+	}
+	endParentDraw(&pd);
+
+	// now figure out where the control is relative to the parent so we can align the brush properly
+	// if anything fails, give up and return the brush as-is
+	uiWindowsEnsureGetWindowRect(hwnd, &hwndScreenRect);
+	// this will be in screen coordinates; convert to parent coordinates
+	mapWindowRect(NULL, parent, &hwndScreenRect);
+	if (SetBrushOrgEx(dc, -hwndScreenRect.left, -hwndScreenRect.top, NULL) == 0)
+		logLastError(L"error setting brush origin");
+
+	return brush;
+}
+
+void paintContainerBackground(HWND hwnd, HDC dc, RECT *paintRect)
+{
+	HWND parent;
+	RECT paintRectParent;
+	struct parentDraw pd;
+	HRESULT hr;
+
+	parent = parentWithBackground(hwnd);
+	hr = parentDraw(dc, parent, &pd);
+	if (hr != S_OK)		// we couldn't get it; draw nothing
+		return;
+
+	paintRectParent = *paintRect;
+	mapWindowRect(hwnd, parent, &paintRectParent);
+	if (BitBlt(dc, paintRect->left, paintRect->top, paintRect->right - paintRect->left, paintRect->bottom - paintRect->top,
+		pd.cdc, paintRectParent.left, paintRectParent.top,
+		SRCCOPY) == 0)
+		logLastError(L"error drawing parent background over uiContainer");
+
+	endParentDraw(&pd);
+}
+
+// TODO make this public if we want custom containers
+// why have this to begin with? http://blogs.msdn.com/b/oldnewthing/archive/2010/03/16/9979112.aspx
+BOOL handleParentMessages(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT *lResult)
+{
+	switch (uMsg) {
+	case WM_COMMAND:
+		return runWM_COMMAND(wParam, lParam, lResult);
+	case WM_NOTIFY:
+		return runWM_NOTIFY(wParam, lParam, lResult);
+	case WM_HSCROLL:
+		return runWM_HSCROLL(wParam, lParam, lResult);
+	case WM_CTLCOLORSTATIC:
+	case WM_CTLCOLORBTN:
+		if (parentBrush != NULL)
+			if (DeleteObject(parentBrush) == 0)
+				logLastError(L"error deleting old background brush()");		// but continue anyway; we will leak a brush but whatever
+		if (SetBkMode((HDC) wParam, TRANSPARENT) == 0)
+			logLastError(L"error setting transparent background mode to controls");		// but continue anyway; text will be wrong
+		parentBrush = getControlBackgroundBrush((HWND) lParam, (HDC) wParam);
+		if (parentBrush == NULL)		// failed; just do default behavior
+			return FALSE;
+		*lResult = (LRESULT) parentBrush;
+		return TRUE;
+	}
+	return FALSE;
+}