Added wxCanvas prototype and sample

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@8205 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

contrib/include/wx/canvas/canvas.h

@@ -0,0 +1,128 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        canvas.h
+// Author:      Robert Roebling
+// Created:     XX/XX/XX
+// Copyright:   2000 (c) Robert Roebling
+// Licence:     wxWindows Licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef __WXCANVAS_H__
+#define __WXCANVAS_H__
+
+#ifdef __GNUG__
+    #pragma interface "canvas.cpp"
+#endif
+
+#ifndef WX_PRECOMP
+    #include "wx/wx.h"
+#endif
+
+#include "wx/image.h"
+#include "wx/txtstrm.h"
+                        
+class wxCanvas;
+
+// WDR: class declarations
+
+//----------------------------------------------------------------------------
+// wxCanvasObject
+//----------------------------------------------------------------------------
+
+class wxCanvasObject: public wxEvtHandler
+{
+public:
+    wxCanvasObject( int x, int y, int width, int height );
+    
+    virtual void Move( int x, int y );
+    virtual void Render( int clip_x, int clip_y, int clip_width, int clip_height );
+    virtual void WriteSVG( wxTextOutputStream &stream );
+    
+    wxCanvas   *GetOwner()              { return m_owner; }
+    void SetOwner( wxCanvas *owner )    { m_owner = owner; }
+    
+    bool        IsControl()     { return m_isControl; }
+    bool        IsVector()      { return m_isVector; }
+    bool        IsImage()       { return m_isImage; }
+    inline int  GetX()          { return m_area.x; }
+    inline int  GetY()          { return m_area.y; }
+    inline int  GetWidth()      { return m_area.width; }
+    inline int  GetHeight()     { return m_area.height; }
+
+protected:
+    wxCanvas   *m_owner;
+    bool        m_isControl;
+    bool        m_isVector;
+    bool        m_isImage;
+    wxRect      m_area;
+    
+    friend class wxCanvas;
+};
+
+//----------------------------------------------------------------------------
+// wxCanvasImage
+//----------------------------------------------------------------------------
+
+class wxCanvasImage: public wxCanvasObject
+{
+public:
+    wxCanvasImage( const wxImage &image, int x, int y );
+    
+    virtual void Render( int clip_x, int clip_y, int clip_width, int clip_height );
+    virtual void WriteSVG( wxTextOutputStream &stream );
+    
+private:
+    wxImage     m_image;
+};
+
+//----------------------------------------------------------------------------
+// wxCanvas
+//----------------------------------------------------------------------------
+
+class wxCanvas: public wxScrolledWindow
+{
+public:
+    // constructors and destructors
+    wxCanvas( wxWindow *parent, wxWindowID id = -1,
+        const wxPoint& pos = wxDefaultPosition,
+        const wxSize& size = wxDefaultSize,
+        long style = wxScrolledWindowStyle );
+    virtual ~wxCanvas();
+    
+    virtual void SetArea( int width, int height );
+    virtual void Update( int x, int y, int width, int height );
+    virtual void UpdateNow();
+    
+    virtual void Prepend( wxCanvasObject* obj );
+    virtual void Append( wxCanvasObject* obj );
+    virtual void Insert( size_t before, wxCanvasObject* obj );
+    virtual void Remove( wxCanvasObject* obj );
+    
+    wxImage *GetBuffer()         { return &m_buffer; }
+    bool NeedUpdate()            { return m_needUpdate; }
+    
+private:
+    wxImage     m_buffer;
+    bool        m_needUpdate;
+    wxList      m_updateRects;
+    wxList      m_objects;
+    
+    friend class wxCanvasObject;
+    
+private:
+    void OnChar( wxKeyEvent &event );
+    void OnPaint( wxPaintEvent &event );
+    void OnMouse( wxMouseEvent &event );
+    void OnSize( wxSizeEvent &event );
+    void OnIdle( wxIdleEvent &event );
+    void OnSetFocus( wxFocusEvent &event );
+    void OnKillFocus( wxFocusEvent &event );
+
+private:
+    DECLARE_CLASS(wxCanvas)
+    DECLARE_EVENT_TABLE()
+};
+
+
+#endif
+    // WXCANVAS
+