/////////////////////////////////////////////////////////////////////////////// // Name: wx/generic/custombgwin.h // Purpose: Generic implementation of wxCustomBackgroundWindow. // Author: Vadim Zeitlin // Created: 2011-10-10 // Copyright: (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org> // Licence: wxWindows licence /////////////////////////////////////////////////////////////////////////////// #ifndef _WX_GENERIC_CUSTOMBGWIN_H_ #define _WX_GENERIC_CUSTOMBGWIN_H_ #include "wx/bitmap.h" #include "wx/dc.h" #include "wx/event.h" #include "wx/window.h" // A helper to avoid template bloat: this class contains all type-independent // code of wxCustomBackgroundWindow<> below. class wxCustomBackgroundWindowGenericBase : public wxCustomBackgroundWindowBase { public: wxCustomBackgroundWindowGenericBase() { } protected: void DoEraseBackground(wxEraseEvent& event, wxWindow* win) { wxDC& dc = *event.GetDC(); const wxSize clientSize = win->GetClientSize(); const wxSize bitmapSize = m_bitmapBg.GetSize(); for ( int x = 0; x < clientSize.x; x += bitmapSize.x ) { for ( int y = 0; y < clientSize.y; y += bitmapSize.y ) { dc.DrawBitmap(m_bitmapBg, x, y); } } } // The bitmap used for painting the background if valid. wxBitmap m_bitmapBg; wxDECLARE_NO_COPY_CLASS(wxCustomBackgroundWindowGenericBase); }; // ---------------------------------------------------------------------------- // wxCustomBackgroundWindow // ---------------------------------------------------------------------------- template <class W> class wxCustomBackgroundWindow : public W, public wxCustomBackgroundWindowGenericBase { public: typedef W BaseWindowClass; wxCustomBackgroundWindow() { } protected: virtual void DoSetBackgroundBitmap(const wxBitmap& bmp) wxOVERRIDE { m_bitmapBg = bmp; if ( m_bitmapBg.IsOk() ) { BaseWindowClass::Bind ( wxEVT_ERASE_BACKGROUND, &wxCustomBackgroundWindow::OnEraseBackground, this ); } else { BaseWindowClass::Unbind ( wxEVT_ERASE_BACKGROUND, &wxCustomBackgroundWindow::OnEraseBackground, this ); } } private: // Event handler for erasing the background which is only used when we have // a valid background bitmap. void OnEraseBackground(wxEraseEvent& event) { DoEraseBackground(event, this); } wxDECLARE_NO_COPY_TEMPLATE_CLASS(wxCustomBackgroundWindow, W); }; #endif // _WX_GENERIC_CUSTOMBGWIN_H_