Function TabWindowProc

source/script_gui.cpp:9153–9196

LRESULT CALLBACK TabWindowProc(HWND hWnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
	// Variables are kept separate up here for future expansion of this function (to handle
	// more iMsgs/cases, etc.):
	GuiType *pgui;
	GuiControlType *pcontrol;
	HWND parent_window;
	HBRUSH bk_brush;
	COLORREF bk_color;

	switch (iMsg)
	{
	case WM_ERASEBKGND:
	case WM_WINDOWPOSCHANGED:
		parent_window = GetParent(hWnd);
		// Relies on short-circuit boolean order:
		if (  !(pgui = GuiType::FindGui(parent_window)) || !(pcontrol = pgui->FindControl(hWnd))  )
			break;
		switch (iMsg)
		{
		case WM_ERASEBKGND:
			pgui->ControlGetBkColor(*pcontrol, true, bk_brush, bk_color);
			if (!bk_brush)
				break; // Let default proc handle it.
			// Can't use SetBkColor(), need a real brush to fill it.
			RECT clipbox;
			GetClipBox((HDC)wParam, &clipbox);
			FillRect((HDC)wParam, &clipbox, bk_brush);
			return 1; // "An application should return nonzero if it erases the background."
		case WM_WINDOWPOSCHANGED:
			if ((LPWINDOWPOS(lParam)->flags & (SWP_NOMOVE | SWP_NOSIZE)) != (SWP_NOMOVE | SWP_NOSIZE)) // i.e. moved, resized or both.
			{
				// This appears to allow the tab control to update its row count:
				LRESULT r = CallWindowProc(g_TabClassProc, hWnd, iMsg, wParam, lParam);
				// Update this tab control's dialog, if it has one, to match the new size/position.
				pgui->UpdateTabDialog(hWnd);
				return r;
			}
		}
	}

	// This will handle anything not already fully handled and returned from above:
	return CallWindowProc(g_TabClassProc, hWnd, iMsg, wParam, lParam);
}