samples/ogl/studio/doc.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        doc.h
   3 // Purpose:     Document classes
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     12/07/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _STUDIO_DOC_H_
  13 #define _STUDIO_DOC_H_
  14
  15 #ifdef __GNUG__
  16 // #pragma interface
  17 #endif
  18
  19 #include <wx/docview.h>
  20 #include <wx/string.h>
  21 #include <wx/wxexpr.h>
  22
  23 #include <wx/ogl/ogl.h>
  24 #include "shapes.h"
  25
  26 /*
  27  * A diagram document, which contains a diagram.
  28  */
  29
  30 class csDiagramDocument: public wxDocument
  31 {
  32   DECLARE_DYNAMIC_CLASS(csDiagramDocument)
  33 public:
  34   csDiagramDocument();
  35   ~csDiagramDocument();
  36
  37   bool OnSaveDocument(const wxString& file);
  38   bool OnOpenDocument(const wxString& file);
  39
  40   inline wxDiagram *GetDiagram() { return &m_diagram; }
  41
  42   bool OnCloseDocument();
  43
  44 protected:
  45   csDiagram         m_diagram;
  46 };
  47
  48 /*
  49  Do/Undo 30/7/98
  50
  51  1) We have a csCommandState, and in csDiagramCommand you have a list of
  52     these. This allows undo to work with several shapes at once.
  53
  54  2) Instead of storing info about each operation, e.g. separate pens, colours,
  55     etc., we simply use a copy of the shape.
  56     In csCommandState, we have a pointer to the actual shape in the canvas, m_currentShape.
  57     We also have wxShape* m_shapeState which stores the requested or previous state
  58     (depending on whether it's before the Do or after the Do.
  59
  60     - In Do: save a temp copy of the old m_currentShape (i.e. the state just before it's changed).
  61       Change the data pointed to by m_currentShape to the new attributes stored in m_shapeState.
  62       Now assign the temp copy to m_shapeState, for use in Undo.
  63
  64       wxShape* temp = m_currentShape->Copy(); // Take a copy of the current state
  65       m_currentShape->Set(m_shapeState);      // Apply the new state (e.g. moving, changing colour etc.)
  66       delete m_shapeState;                    // Delete the previous 'old state'.
  67       m_shapeState = temp;                    // Remember the new 'old state'.
  68
  69  */
  70
  71
  72 class csCommandState;
  73 class csDiagramCommand: public wxCommand
  74 {
  75     friend class csCommandState;
  76  public:
  77   // Multi-purpose constructor for creating, deleting shapes
  78   csDiagramCommand(const wxString& name, csDiagramDocument *doc,
  79     csCommandState* onlyState = NULL); // Allow for the common case of just one state to change
  80
  81   ~csDiagramCommand();
  82
  83   bool Do();
  84   bool Undo();
  85
  86   // Add a state to the end of the list
  87   void AddState(csCommandState* state);
  88
  89   // Insert a state at the beginning of the list
  90   void InsertState(csCommandState* state);
  91
  92   // Schedule all lines connected to the states to be cut.
  93   void RemoveLines();
  94
  95   // Find the state that refers to this shape
  96   csCommandState* FindStateByShape(wxShape* shape);
  97
  98   wxList& GetStates() const { return (wxList&) m_states; }
  99
 100  protected:
 101   csDiagramDocument*    m_doc;
 102   wxList                m_states;
 103 };
 104
 105 class csCommandState: public wxObject
 106 {
 107     friend class csDiagramCommand;
 108 public:
 109     csCommandState(int cmd, wxShape* savedState, wxShape* shapeOnCanvas);
 110     ~csCommandState();
 111
 112     bool Do();
 113     bool Undo();
 114
 115     inline void SetSavedState(wxShape *s) { m_savedState = s; }
 116     inline wxShape *GetSavedState() const { return m_savedState; }
 117
 118     inline void SetShapeOnCanvas(wxShape *s) { m_shapeOnCanvas = s; }
 119     inline wxShape *GetShapeOnCanvas() const { return m_shapeOnCanvas; }
 120 protected:
 121     wxShape*                m_savedState;       // Previous state, for restoring on Undo
 122     wxShape*                m_shapeOnCanvas;    // The actual shape on the canvas
 123     csDiagramDocument*      m_doc;
 124     int                     m_cmd;
 125
 126     // These store the line ordering for the shapes at either end,
 127     // so an un-cut line can restore the ordering properly. Otherwise
 128     // it just adds the line at an arbitrary position.
 129     int                     m_linePositionFrom;
 130     int                     m_linePositionTo;
 131 };
 132
 133 #endif
 134   // _STUDIO_DOC_H_