X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/53a2db124c633f80bdb16336084262037d879a2c..4f2511d706e5274a34e1521e11c1b95fed735b42:/include/wx/prntbase.h

diff --git a/include/wx/prntbase.h b/include/wx/prntbase.h
index b20a9f6cd5..81e32415b5 100644
--- a/include/wx/prntbase.h
+++ b/include/wx/prntbase.h
@@ -338,6 +338,8 @@ public:
                     const wxString& name = wxT("canvas"));
     virtual ~wxPreviewCanvas();
 
+    void SetPreview(wxPrintPreviewBase *preview) { m_printPreview = preview; }
+
     void OnPaint(wxPaintEvent& event);
     void OnChar(wxKeyEvent &event);
     // Responds to colour changes
@@ -347,6 +349,7 @@ private:
 #if wxUSE_MOUSEWHEEL
     void OnMouseWheel(wxMouseEvent& event);
 #endif // wxUSE_MOUSEWHEEL
+    void OnIdle(wxIdleEvent& event);
 
     wxPrintPreviewBase* m_printPreview;
 
@@ -519,6 +522,10 @@ public:
     // The preview canvas should call this from OnPaint
     virtual bool PaintPage(wxPreviewCanvas *canvas, wxDC& dc);
 
+    // Updates rendered page by calling RenderPage() if needed, returns true
+    // if there was some change. Preview canvas should call it at idle time
+    virtual bool UpdatePageRendering();
+
     // This draws a blank page onto the preview canvas
     virtual bool DrawBlankPage(wxPreviewCanvas *canvas, wxDC& dc);
 
@@ -554,11 +561,20 @@ public:
     // the currently selected printer.
     virtual void DetermineScaling() = 0;
 
+protected:
+    // helpers for RenderPage():
+    virtual bool RenderPageIntoDC(wxDC& dc, int pageNum);
+    // renders preview into m_previewBitmap
+    virtual bool RenderPageIntoBitmap(wxBitmap& bmp, int pageNum);
+
+    void InvalidatePreviewBitmap();
+
 protected:
     wxPrintDialogData m_printDialogData;
     wxPreviewCanvas*  m_previewCanvas;
     wxFrame*          m_previewFrame;
     wxBitmap*         m_previewBitmap;
+    bool              m_previewFailed;
     wxPrintout*       m_previewPrintout;
     wxPrintout*       m_printPrintout;
     int               m_currentPage;
@@ -608,6 +624,7 @@ public:
     virtual wxFrame *GetFrame() const;
     virtual wxPreviewCanvas *GetCanvas() const;
     virtual bool PaintPage(wxPreviewCanvas *canvas, wxDC& dc);
+    virtual bool UpdatePageRendering();
     virtual bool DrawBlankPage(wxPreviewCanvas *canvas, wxDC& dc);
     virtual void AdjustScrollbars(wxPreviewCanvas *canvas);
     virtual bool RenderPage(int pageNum);