include/wx/textentry.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/textentry.h
   3 // Purpose:     declares wxTextEntry interface defining a simple text entry
   4 // Author:      Vadim Zeitlin
   5 // Created:     2007-09-24
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2007 Vadim Zeitlin <vadim@wxwindows.org>
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _WX_TEXTENTRY_H_
  12 #define _WX_TEXTENTRY_H_
  13
  14 // wxTextPos is the position in the text (currently it's hardly used anywhere
  15 // and should probably be replaced with int anyhow)
  16 typedef long wxTextPos;
  17
  18 // ----------------------------------------------------------------------------
  19 // wxTextEntryBase
  20 // ----------------------------------------------------------------------------
  21
  22 class WXDLLIMPEXP_CORE wxTextEntryBase
  23 {
  24 public:
  25     wxTextEntryBase() { m_eventsBlock = 0; }
  26     virtual ~wxTextEntryBase() { }
  27
  28
  29     // accessing the value
  30     // -------------------
  31
  32     // SetValue() generates a text change event, ChangeValue() doesn't
  33     virtual void SetValue(const wxString& value)
  34         { DoSetValue(value, SetValue_SendEvent); }
  35     virtual void ChangeValue(const wxString& value)
  36         { DoSetValue(value, SetValue_NoEvent); }
  37
  38     // writing text inserts it at the current position replacing any current
  39     // selection, appending always inserts it at the end and doesn't remove any
  40     // existing text (but it will reset the selection if there is any)
  41     virtual void WriteText(const wxString& text) = 0;
  42     virtual void AppendText(const wxString& text);
  43
  44     virtual wxString GetValue() const = 0;
  45     virtual wxString GetRange(long from, long to) const;
  46     bool IsEmpty() const { return GetValue().empty(); }
  47
  48
  49     // editing operations
  50     // ------------------
  51
  52     virtual void Replace(long from, long to, const wxString& value);
  53     virtual void Remove(long from, long to) = 0;
  54     virtual void Clear() { SetValue(wxString()); }
  55
  56
  57     // clipboard operations
  58     // --------------------
  59
  60     virtual void Copy() = 0;
  61     virtual void Cut() = 0;
  62     virtual void Paste() = 0;
  63
  64     virtual bool CanCopy() const;
  65     virtual bool CanCut() const;
  66     virtual bool CanPaste() const;
  67
  68     // undo/redo
  69     // ---------
  70
  71     virtual void Undo() = 0;
  72     virtual void Redo() = 0;
  73
  74     virtual bool CanUndo() const = 0;
  75     virtual bool CanRedo() const = 0;
  76
  77
  78     // insertion point
  79     // ---------------
  80
  81     // note that moving insertion point removes any current selection
  82     virtual void SetInsertionPoint(long pos) = 0;
  83     virtual void SetInsertionPointEnd() { SetInsertionPoint(-1); }
  84     virtual long GetInsertionPoint() const = 0;
  85     virtual long GetLastPosition() const = 0;
  86
  87
  88     // selection
  89     // ---------
  90
  91     virtual void SetSelection(long from, long to) = 0;
  92     virtual void SelectAll() { SetSelection(0, GetLastPosition()); }
  93     virtual void GetSelection(long *from, long *to) const = 0;
  94     bool HasSelection() const;
  95     virtual wxString GetStringSelection() const;
  96
  97
  98     // status
  99     // ------
 100     virtual bool IsEditable() const = 0;
 101     virtual void SetEditable(bool editable) = 0;
 102
 103
 104     // set the max number of characters which may be entered in a single line
 105     // text control
 106     virtual void SetMaxLength(unsigned long WXUNUSED(len)) { }
 107
 108
 109 protected:
 110     // flags for DoSetValue(): common part of SetValue() and ChangeValue() and
 111     // also used to implement WriteText() in wxMSW
 112     enum
 113     {
 114         SetValue_NoEvent = 0,
 115         SetValue_SendEvent = 1,
 116         SetValue_SelectionOnly = 2
 117     };
 118
 119     virtual void DoSetValue(const wxString& value, int flags);
 120
 121     // class which should be used to temporarily disable text change events
 122     //
 123     // if suppress argument in ctor is false, nothing is done
 124     class EventsSuppressor
 125     {
 126     public:
 127         EventsSuppressor(wxTextEntryBase *text, bool suppress = true)
 128         {
 129             m_suppress = suppress;
 130             if ( m_suppress )
 131             {
 132                 m_text = text;
 133                 m_text->SuppressTextChangedEvents();
 134             }
 135         }
 136
 137         ~EventsSuppressor()
 138         {
 139             if ( m_suppress )
 140                 m_text->ResumeTextChangedEvents();
 141         }
 142
 143     private:
 144         wxTextEntryBase *m_text;
 145         bool m_suppress;
 146     };
 147
 148     // return true if the events are currently not suppressed
 149     bool EventsAllowed() const { return m_eventsBlock == 0; }
 150
 151 private:
 152     // suppress or resume the text changed events generation: don't use these
 153     // functions directly, use EventsSuppressor class above instead
 154     void SuppressTextChangedEvents()
 155     {
 156         if ( !m_eventsBlock++ )
 157             EnableTextChangedEvents(false);
 158     }
 159
 160     void ResumeTextChangedEvents()
 161     {
 162         if ( !--m_eventsBlock )
 163             EnableTextChangedEvents(true);
 164     }
 165
 166
 167     // this must be overridden in the derived classes if our implementation of
 168     // SetValue() or Replace() is used to disable (and enable back) generation
 169     // of the text changed events
 170     //
 171     // initially the generation of the events is enabled
 172     virtual void EnableTextChangedEvents(bool WXUNUSED(enable)) { }
 173
 174
 175     friend class EventsSuppressor;
 176
 177     // if this counter is non-null, events are blocked
 178     unsigned m_eventsBlock;
 179 };
 180
 181 #ifdef __WXGTK20__
 182     #include "wx/gtk/textentry.h"
 183 #else
 184     // no platform-specific implementation of wxTextEntry yet
 185     class WXDLLIMPEXP_CORE wxTextEntry : public wxTextEntryBase
 186     {
 187     };
 188 #endif
 189
 190 #endif // _WX_TEXTENTRY_H_
 191