// 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; if (getClientRect(parent, &r) == 0) return logLastError(L"error getting parent's client rect"); 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 if (getWindowRect(hwnd, &hwndScreenRect) == 0) { logLastError(L"error getting control window rect"); return brush; } // 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; }