From 9c347fe57e80ce02d2263a6a8718cfb554c1ce5e Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Thu, 14 May 2015 12:49:02 -0400
Subject: [PATCH] Added code which handles stuff for OS parents on Windows.

---
 redo/windows/parent.c         | 143 ++++++++++++++++++++++++++++++++++
 redo/windows/uipriv_windows.h |   3 +
 2 files changed, 146 insertions(+)
 create mode 100644 redo/windows/parent.c

diff --git a/redo/windows/parent.c b/redo/windows/parent.c
new file mode 100644
index 00000000..4df6ebd2
--- /dev/null
+++ b/redo/windows/parent.c
@@ -0,0 +1,143 @@
+// 26 april 2015
+#include "uipriv_windows.h"
+
+// This contains code used by all OS controls that contain other controls. It also contains the container drawing code.
+
+static HBRUSH parentBrush = NULL;
+
+static HWND realParent(HWND hwnd)
+{
+	HWND parent;
+	int class;
+
+	parent = hwnd;
+	for (;;) {
+		parent = GetAncestor(parent, GA_PARENT);
+		// skip groupboxes; they're (supposed to be) transparent
+		// skip uiContainers; they don't draw anything
+		class = windowClassOf(parent, L"button", containerClass, NULL);
+		if (class != 0 && class != 1)
+			break;
+	}
+	return parent;
+}
+
+struct parentDraw {
+	HDC cdc;
+	HBITMAP bitmap;
+	HBITMAP prevbitmap;
+};
+
+static void parentDraw(HDC dc, HWND parent, struct parentDraw *pd)
+{
+	RECT r;
+
+	if (GetClientRect(parent, &r) == 0)
+		logLastError("error getting parent's client rect in parentDraw()");
+	pd->cdc = CreateCompatibleDC(dc);
+	if (pd->cdc == NULL)
+		logLastError("error creating compatible DC in parentDraw()");
+	pd->bitmap = CreateCompatibleBitmap(dc, r.right - r.left, r.bottom - r.top);
+	if (pd->bitmap == NULL)
+		logLastError("error creating compatible bitmap in parentDraw()");
+	pd->prevbitmap = SelectObject(pd->cdc, pd->bitmap);
+	if (pd->prevbitmap == NULL)
+		logLastError("error selecting bitmap into compatible DC in parentDraw()");
+	SendMessageW(parent, WM_PRINTCLIENT, (WPARAM) (pd->cdc), PRF_CLIENT);
+}
+
+static void endParentDraw(struct parentDraw *pd)
+{
+	if (SelectObject(pd->cdc, pd->prevbitmap) != pd->bitmap)
+		logLastError("error selecting previous bitmap back into compatible DC in endParentDraw()");
+	if (DeleteObject(pd->bitmap) == 0)
+		logLastError("error deleting compatible bitmap in endParentDraw()");
+	if (DeleteDC(pd->cdc) == 0)
+		logLastError("error deleting compatible DC in endParentDraw()");
+}
+
+// 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;
+
+	parent = realParent(hwnd);
+
+	parentDraw(dc, parent, &pd);
+	brush = CreatePatternBrush(pd.bitmap);
+	if (brush == NULL)
+		logLastError("error creating pattern brush in getControlBackgroundBrush()");
+	endParentDraw(&pd);
+
+	// now figure out where the control is relative to the parent so we can align the brush properly
+	if (GetWindowRect(hwnd, &hwndScreenRect) == 0)
+		logLastError("error getting control window rect in getControlBackgroundBrush()");
+	// this will be in screen coordinates; convert to parent coordinates
+	mapWindowRect(NULL, parent, &hwndScreenRect);
+	if (SetBrushOrgEx(dc, -hwndScreenRect.left, -hwndScreenRect.top, NULL) == 0)
+		logLastError("error setting brush origin in getControlBackgroundBrush()");
+
+	return brush;
+}
+
+// TODO
+static void paintContainerBackground(HWND hwnd, HDC dc, RECT *paintRect)
+{
+	HWND parent;
+	RECT paintRectParent;
+	struct parentDraw pd;
+
+	parent = realParent(hwnd);
+	parentDraw(dc, parent, &pd);
+
+	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("error drawing parent background over uiContainer in paintContainerBackground()");
+
+	endParentDraw(&pd);
+}
+
+// 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)
+{
+	HWND control;
+	NMHDR *nm = (NMHDR *) lParam;
+	RECT r;
+
+	switch (uMsg) {
+	case WM_COMMAND:
+		// bounce back to the control in question
+		// except if to the initial parent, in which case act as if the message was ignored
+		control = (HWND) lParam;
+		if (control != NULL && IsChild(initialParent, control) == 0) {
+			*lResult = SendMessageW(control, msgCOMMAND, wParam, lParam);
+			return TRUE;
+		}
+		break;
+	case WM_NOTIFY:
+		// same as WM_COMMAND
+		control = nm->hwndFrom;
+		if (control != NULL && IsChild(initialParent, control) == 0) {
+			*lResult = SendMessageW(control, msgNOTIFY, wParam, lParam);
+			return TRUE;
+		}
+		break;
+	case WM_CTLCOLORSTATIC:
+	case WM_CTLCOLORBTN:
+		if (parentBrush != NULL)
+			if (DeleteObject(c->brush) == 0)
+				logLastError("error deleting old background brush in containerWndProc()");
+		if (SetBkMode((HDC) wParam, TRANSPARENT) == 0)
+			logLastError("error setting transparent background mode to controls in containerWndProc()");
+		parentBrush = getControlBackgroundBrush((HWND) lParam, (HDC) wParam);
+		*lResult = (LRESULT) parentBrush;
+		return TRUE;
+	}
+	return FALSE;
+}
diff --git a/redo/windows/uipriv_windows.h b/redo/windows/uipriv_windows.h
index e61b37ad..c51feb74 100644
--- a/redo/windows/uipriv_windows.h
+++ b/redo/windows/uipriv_windows.h
@@ -108,3 +108,6 @@ extern void moveAndReorderWindow(HWND, HWND, intmax_t, intmax_t, intmax_t, intma
 // utilwindow.c
 extern const char *initUtilWindow(HICON, HCURSOR);
 extern void uninitUtilWindow(void);
+
+// parent.c
+extern BOOL handleParentMessages(HWND, UINT, WPARAM, LPARAM, LRESULT *);