docs/latex/wx/view.tex

   1 \section{\class{wxView}}\label{wxview}
   2
   3 The view class can be used to model the viewing and editing component of
   4 an application's file-based data. It is part of the document/view framework supported by wxWindows,
   5 and cooperates with the \helpref{wxDocument}{wxdocument}, \helpref{wxDocTemplate}{wxdoctemplate}
   6 and \helpref{wxDocManager}{wxdocmanager} classes.
   7
   8 \wxheading{Derived from}
   9
  10 \helpref{wxEvtHandler}{wxevthandler}\\
  11 \helpref{wxObject}{wxobject}
  12
  13 \wxheading{See also}
  14
  15 \helpref{wxView overview}{wxviewoverview}, \helpref{wxDocument}{wxdocument}, \helpref{wxDocTemplate}{wxdoctemplate},\rtfsp
  16 \helpref{wxDocManager}{wxdocmanager}
  17
  18 \latexignore{\rtfignore{\wxheading{Members}}}
  19
  20 \membersection{wxView::m\_viewDocument}
  21
  22 \member{wxDocument*}{m\_viewDocument}
  23
  24 The document associated with this view. There may be more than one view per
  25 document, but there can never be more than one document for one view.
  26
  27 \membersection{wxView::m\_viewFrame}
  28
  29 \member{wxFrame*}{m\_viewFrame}
  30
  31 Frame associated with the view, if any.
  32
  33 \membersection{wxView::m\_viewTypeName}
  34
  35 \member{wxString}{m\_viewTypeName}
  36
  37 The view type name given to the wxDocTemplate constructor, copied to this
  38 variable when the view is created. Not currently used by the framework.
  39
  40 \membersection{wxView::wxView}
  41
  42 \func{}{wxView}{\param{wxDocument* }{doc = NULL}}
  43
  44 Constructor. Define your own default constructor to initialize application-specific
  45 data.
  46
  47 \membersection{wxView::\destruct{wxView}}
  48
  49 \func{}{\destruct{wxView}}{\void}
  50
  51 Destructor. Removes itself from the document's list of views.
  52
  53 \membersection{wxView::Activate}
  54
  55 \func{virtual void}{Activate}{\param{bool}{ activate}}
  56
  57 Call this from your view frame's OnActivate member to tell the framework which view is
  58 currently active. If your windowing system doesn't call OnActivate, you may need to
  59 call this function from OnMenuCommand or any place where you know the view must
  60 be active, and the framework will need to get the current view.
  61
  62 The prepackaged view frame wxDocChildFrame calls wxView::Activate from its OnActivate member
  63 and from its OnMenuCommand member.
  64
  65 This function calls wxView::OnActivateView.
  66
  67 \membersection{wxView::Close}
  68
  69 \func{virtual bool}{Close}{\param{bool}{ deleteWindow = TRUE}}
  70
  71 Closes the view by calling OnClose. If {\it deleteWindow} is TRUE, this function should
  72 delete the window associated with the view.
  73
  74 \membersection{wxView::GetDocument}
  75
  76 \constfunc{wxDocument*}{GetDocument}{\void}
  77
  78 Gets a pointer to the document associated with the view.
  79
  80 \membersection{wxView::GetDocumentManager}
  81
  82 \constfunc{wxDocumentManager*}{GetDocumentManager}{\void}
  83
  84 Returns a pointer to the document manager instance associated with this view.
  85
  86 \membersection{wxView::GetFrame}
  87
  88 \func{wxFrame *}{GetFrame}{\void}
  89
  90 Gets the frame associated with the view (if any).
  91
  92 \membersection{wxView::GetViewName}
  93
  94 \constfunc{wxString}{GetViewName}{\void}
  95
  96 Gets the name associated with the view (passed to the wxDocTemplate constructor).
  97 Not currently used by the framework.
  98
  99 \membersection{wxView::OnActivateView}
 100
 101 \func{virtual void}{OnActivateView}{\param{bool }{activate}, \param{wxView *}{activeView}, \param{wxView *}{deactiveView}}
 102
 103 Called when a view is activated by means of wxView::Activate. The default implementation does
 104 nothing.
 105
 106 \membersection{wxView::OnChangeFilename}
 107
 108 \func{virtual void}{OnChangeFilename}{\void}
 109
 110 Called when the filename has changed. The default implementation constructs a
 111 suitable title and sets the title of the view frame (if any).
 112
 113 \membersection{wxView::OnClose}
 114
 115 \func{virtual bool}{OnClose}{\param{bool}{ deleteWindow}}
 116
 117 Implements closing behaviour. The default implementation calls wxDocument::Close
 118 to close the associated document. Does not delete the view. The application
 119 may wish to do some cleaning up operations in this function, {\it if} a
 120 call to wxDocument::Close succeeded. For example, if your application's
 121 all share the same window, you need to disassociate the window from the view
 122 and perhaps clear the window. If {\it deleteWindow} is TRUE, delete the
 123 frame associated with the view.
 124
 125 \membersection{wxView::OnCreate}
 126
 127 \func{virtual bool}{OnCreate}{\param{wxDocument* }{doc}, \param{long}{ flags}}
 128
 129 Called just after view construction to give the view a chance to initialize
 130 itself based on the passed document and flags (unused). By default, simply
 131 returns TRUE. If the function returns FALSE, the view will be deleted.
 132
 133 The predefined document child frame, wxDocChildFrame, calls this function
 134 automatically.
 135
 136 \membersection{wxView::OnCreatePrintout}
 137
 138 \func{virtual wxPrintout*}{OnCreatePrintout}{\void}
 139
 140 If the printing framework is enabled in the library, this function returns a
 141 \rtfsp\helpref{wxPrintout}{wxprintout} object for the purposes of printing. It should create a new object
 142 everytime it is called; the framework will delete objects it creates.
 143
 144 By default, this function returns an instance of wxDocPrintout, which prints
 145 and previews one page by calling wxView::OnDraw.
 146
 147 Override to return an instance of a class other than wxDocPrintout.
 148
 149 \membersection{wxView::OnUpdate}
 150
 151 \func{virtual void}{OnUpdate}{\param{wxView* }{sender}, \param{wxObject* }{hint}}
 152
 153 Called when the view should be updated. {\it sender} is a pointer to the view
 154 that sent the update request, or NULL if no single view requested the update (for instance,
 155 when the document is opened). {\it hint} is as yet unused but may in future contain
 156 application-specific information for making updating more efficient.
 157
 158 \membersection{wxView::SetDocument}
 159
 160 \func{void}{SetDocument}{\param{wxDocument* }{doc}}
 161
 162 Associates the given document with the view. Normally called by the
 163 framework.
 164
 165 \membersection{wxView::SetFrame}
 166
 167 \func{void}{SetFrame}{\param{wxFrame* }{frame}}
 168
 169 Sets the frame associated with this view. The application should call this
 170 if possible, to tell the view about the frame.
 171
 172 \membersection{wxView::SetViewName}
 173
 174 \func{void}{SetViewName}{\param{const wxString\& }{name}}
 175
 176 Sets the view type name. Should only be called by the framework.
 177
 178