include/wx/generic/splitter.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/splitter.h
   3 // Purpose:     wxSplitterWindow class
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef __SPLITTERH_G__
  13 #define __SPLITTERH_G__
  14
  15 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  16     #pragma interface "splitter.h"
  17 #endif
  18
  19 #include "wx/window.h"                      // base class declaration
  20 #include "wx/containr.h"                    // wxControlContainer
  21
  22 class WXDLLEXPORT wxSplitterEvent;
  23
  24 // ---------------------------------------------------------------------------
  25 // splitter constants
  26 // ---------------------------------------------------------------------------
  27
  28 enum wxSplitMode
  29 {
  30     wxSPLIT_HORIZONTAL = 1,
  31     wxSPLIT_VERTICAL
  32 };
  33
  34 enum
  35 {
  36     wxSPLIT_DRAG_NONE,
  37     wxSPLIT_DRAG_DRAGGING,
  38     wxSPLIT_DRAG_LEFT_DOWN
  39 };
  40
  41 // ---------------------------------------------------------------------------
  42 // wxSplitterWindow maintains one or two panes, with
  43 // an optional vertical or horizontal split which
  44 // can be used with the mouse or programmatically.
  45 // ---------------------------------------------------------------------------
  46
  47 // TODO:
  48 // 1) Perhaps make the borders sensitive to dragging in order to create a split.
  49 //    The MFC splitter window manages scrollbars as well so is able to
  50 //    put sash buttons on the scrollbars, but we probably don't want to go down
  51 //    this path.
  52 // 2) for wxWidgets 2.0, we must find a way to set the WS_CLIPCHILDREN style
  53 //    to prevent flickering. (WS_CLIPCHILDREN doesn't work in all cases so can't be
  54 //    standard).
  55
  56 class WXDLLEXPORT wxSplitterWindow: public wxWindow
  57 {
  58 public:
  59
  60 ////////////////////////////////////////////////////////////////////////////
  61 // Public API
  62
  63     // Default constructor
  64     wxSplitterWindow()
  65     {
  66         Init();
  67     }
  68
  69     // Normal constructor
  70     wxSplitterWindow(wxWindow *parent, wxWindowID id = wxID_ANY,
  71                      const wxPoint& pos = wxDefaultPosition,
  72                      const wxSize& size = wxDefaultSize,
  73                      long style = wxSP_3D,
  74                      const wxString& name = wxT("splitter"))
  75     {
  76         Init();
  77         Create(parent, id, pos, size, style, name);
  78     }
  79
  80     virtual ~wxSplitterWindow();
  81
  82     bool Create(wxWindow *parent, wxWindowID id = wxID_ANY,
  83                      const wxPoint& pos = wxDefaultPosition,
  84                      const wxSize& size = wxDefaultSize,
  85                      long style = wxSP_3D,
  86                      const wxString& name = wxT("splitter"));
  87
  88     // Gets the only or left/top pane
  89     wxWindow *GetWindow1() const { return m_windowOne; }
  90
  91     // Gets the right/bottom pane
  92     wxWindow *GetWindow2() const { return m_windowTwo; }
  93
  94     // Sets the split mode
  95     void SetSplitMode(int mode)
  96     {
  97         wxASSERT_MSG( mode == wxSPLIT_VERTICAL || mode == wxSPLIT_HORIZONTAL,
  98                       _T("invalid split mode") );
  99
 100         m_splitMode = (wxSplitMode)mode;
 101     }
 102
 103     // Gets the split mode
 104     wxSplitMode GetSplitMode() const { return m_splitMode; };
 105
 106     // Initialize with one window
 107     void Initialize(wxWindow *window);
 108
 109     // Associates the given window with window 2, drawing the appropriate sash
 110     // and changing the split mode.
 111     // Does nothing and returns false if the window is already split.
 112     // A sashPosition of 0 means choose a default sash position,
 113     // negative sashPosition specifies the size of right/lower pane as it's
 114     // absolute value rather than the size of left/upper pane.
 115     virtual bool SplitVertically(wxWindow *window1,
 116                                  wxWindow *window2,
 117                                  int sashPosition = 0)
 118         { return DoSplit(wxSPLIT_VERTICAL, window1, window2, sashPosition); }
 119     virtual bool SplitHorizontally(wxWindow *window1,
 120                                    wxWindow *window2,
 121                                    int sashPosition = 0)
 122         { return DoSplit(wxSPLIT_HORIZONTAL, window1, window2, sashPosition); }
 123
 124     // Removes the specified (or second) window from the view
 125     // Doesn't actually delete the window.
 126     bool Unsplit(wxWindow *toRemove = (wxWindow *) NULL);
 127
 128     // Replaces one of the windows with another one (neither old nor new
 129     // parameter should be NULL)
 130     bool ReplaceWindow(wxWindow *winOld, wxWindow *winNew);
 131
 132     // Make sure the child window sizes are updated. This is useful
 133     // for reducing flicker by updating the sizes before a
 134     // window is shown, if you know the overall size is correct.
 135     void UpdateSize();
 136
 137     // Is the window split?
 138     bool IsSplit() const { return (m_windowTwo != NULL); }
 139
 140     // Sets the sash size
 141     void SetSashSize(int WXUNUSED(width)) { }
 142
 143     // Sets the border size
 144     void SetBorderSize(int WXUNUSED(width)) { }
 145
 146     // Gets the sash size
 147     int GetSashSize() const;
 148
 149     // Gets the border size
 150     int GetBorderSize() const;
 151
 152     // Set the sash position
 153     void SetSashPosition(int position, bool redraw = true);
 154
 155     // Gets the sash position
 156     int GetSashPosition() const { return m_sashPosition; }
 157
 158     // If this is zero, we can remove panes by dragging the sash.
 159     void SetMinimumPaneSize(int min);
 160     int GetMinimumPaneSize() const { return m_minimumPaneSize; }
 161
 162     // NB: the OnXXX() functions below are for backwards compatibility only,
 163     //     don't use them in new code but handle the events instead!
 164
 165     // called when the sash position is about to change, may return a new value
 166     // for the sash or -1 to prevent the change from happening at all
 167     virtual int OnSashPositionChanging(int newSashPosition);
 168
 169     // Called when the sash position is about to be changed, return
 170     // false from here to prevent the change from taking place.
 171     // Repositions sash to minimum position if pane would be too small.
 172     // newSashPosition here is always positive or zero.
 173     virtual bool OnSashPositionChange(int newSashPosition);
 174
 175     // If the sash is moved to an extreme position, a subwindow
 176     // is removed from the splitter window, and the app is
 177     // notified. The app should delete or hide the window.
 178     virtual void OnUnsplit(wxWindow *removed);
 179
 180     // Called when the sash is double-clicked.
 181     // The default behaviour is to remove the sash if the
 182     // minimum pane size is zero.
 183     virtual void OnDoubleClickSash(int x, int y);
 184
 185 ////////////////////////////////////////////////////////////////////////////
 186 // Implementation
 187
 188     // Paints the border and sash
 189     void OnPaint(wxPaintEvent& event);
 190
 191     // Handles mouse events
 192     void OnMouseEvent(wxMouseEvent& ev);
 193
 194     // Adjusts the panes
 195     void OnSize(wxSizeEvent& event);
 196
 197     // In live mode, resize child windows in idle time
 198     void OnInternalIdle();
 199
 200     // Draws the sash
 201     virtual void DrawSash(wxDC& dc);
 202
 203     // Draws the sash tracker (for whilst moving the sash)
 204     virtual void DrawSashTracker(int x, int y);
 205
 206     // Tests for x, y over sash
 207     virtual bool SashHitTest(int x, int y, int tolerance = 5);
 208
 209     // Resizes subwindows
 210     virtual void SizeWindows();
 211
 212     void SetNeedUpdating(bool needUpdating) { m_needUpdating = needUpdating; }
 213     bool GetNeedUpdating() const { return m_needUpdating ; }
 214
 215 #ifdef __WXMAC__
 216         virtual bool MacClipGrandChildren() const { return true ; }
 217 #endif
 218 protected:
 219     // event handlers
 220 #if defined(__WXMSW__) || defined(__WXMAC__)
 221     void OnSetCursor(wxSetCursorEvent& event);
 222 #endif // wxMSW
 223
 224     // send the given event, return false if the event was processed and vetoed
 225     // by the user code
 226     inline bool DoSendEvent(wxSplitterEvent& event);
 227
 228 protected:
 229     // common part of all ctors
 230     void Init();
 231
 232     // common part of SplitVertically() and SplitHorizontally()
 233     bool DoSplit(wxSplitMode mode,
 234                  wxWindow *window1, wxWindow *window2,
 235                  int sashPosition);
 236
 237     // adjusts sash position with respect to min. pane and window sizes
 238     int AdjustSashPosition(int sashPos) const;
 239
 240     // get either width or height depending on the split mode
 241     int GetWindowSize() const;
 242
 243     // convert the user specified sash position which may be > 0 (as is), < 0
 244     // (specifying the size of the right pane) or 0 (use default) to the real
 245     // position to be passed to DoSetSashPosition()
 246     int ConvertSashPosition(int sashPos) const;
 247
 248     // set the real sash position, sashPos here must be positive
 249     //
 250     // returns true if the sash position has been changed, false otherwise
 251     bool DoSetSashPosition(int sashPos);
 252
 253     // set the sash position and send an event about it having been changed
 254     void SetSashPositionAndNotify(int sashPos);
 255
 256     // callbacks executed when we detect that the mouse has entered or left
 257     // the sash
 258     virtual void OnEnterSash();
 259     virtual void OnLeaveSash();
 260
 261     // set the cursor appropriate for the current split mode
 262     void SetResizeCursor();
 263
 264     // redraw the splitter if its "hotness" changed if necessary
 265     void RedrawIfHotSensitive(bool isHot);
 266
 267     wxSplitMode m_splitMode;
 268     wxWindow*   m_windowOne;
 269     wxWindow*   m_windowTwo;
 270     int         m_dragMode;
 271     int         m_oldX;
 272     int         m_oldY;
 273     int         m_sashPosition; // Number of pixels from left or top
 274     int         m_requestedSashPosition;
 275     int         m_sashPositionCurrent; // while dragging
 276     int         m_firstX;
 277     int         m_firstY;
 278     int         m_minimumPaneSize;
 279     wxCursor    m_sashCursorWE;
 280     wxCursor    m_sashCursorNS;
 281     wxPen      *m_sashTrackerPen;
 282
 283     // when in live mode, set this to true to resize children in idle
 284     bool        m_needUpdating:1;
 285     bool        m_permitUnsplitAlways:1;
 286     bool        m_isHot:1;
 287     bool        m_checkRequestedSashPosition:1;
 288
 289 private:
 290     WX_DECLARE_CONTROL_CONTAINER();
 291
 292     DECLARE_DYNAMIC_CLASS(wxSplitterWindow)
 293     DECLARE_EVENT_TABLE()
 294     DECLARE_NO_COPY_CLASS(wxSplitterWindow)
 295 };
 296
 297 // ----------------------------------------------------------------------------
 298 // event class and macros
 299 // ----------------------------------------------------------------------------
 300
 301 // we reuse the same class for all splitter event types because this is the
 302 // usual wxWin convention, but the three event types have different kind of
 303 // data associated with them, so the accessors can be only used if the real
 304 // event type matches with the one for which the accessors make sense
 305 class WXDLLEXPORT wxSplitterEvent : public wxNotifyEvent
 306 {
 307 public:
 308     wxSplitterEvent(wxEventType type = wxEVT_NULL,
 309                     wxSplitterWindow *splitter = (wxSplitterWindow *)NULL)
 310         : wxNotifyEvent(type)
 311     {
 312         SetEventObject(splitter);
 313         if (splitter) m_id = splitter->GetId();
 314     }
 315
 316     // SASH_POS_CHANGED methods
 317
 318     // setting the sash position to -1 prevents the change from taking place at
 319     // all
 320     void SetSashPosition(int pos)
 321     {
 322         wxASSERT( GetEventType() == wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGED
 323                 || GetEventType() == wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGING);
 324
 325         m_data.pos = pos;
 326     }
 327
 328     int GetSashPosition() const
 329     {
 330         wxASSERT( GetEventType() == wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGED
 331                 || GetEventType() == wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGING);
 332
 333         return m_data.pos;
 334     }
 335
 336     // UNSPLIT event methods
 337     wxWindow *GetWindowBeingRemoved() const
 338     {
 339         wxASSERT( GetEventType() == wxEVT_COMMAND_SPLITTER_UNSPLIT );
 340
 341         return m_data.win;
 342     }
 343
 344     // DCLICK event methods
 345     int GetX() const
 346     {
 347         wxASSERT( GetEventType() == wxEVT_COMMAND_SPLITTER_DOUBLECLICKED );
 348
 349         return m_data.pt.x;
 350     }
 351
 352     int GetY() const
 353     {
 354         wxASSERT( GetEventType() == wxEVT_COMMAND_SPLITTER_DOUBLECLICKED );
 355
 356         return m_data.pt.y;
 357     }
 358
 359 private:
 360     friend class WXDLLEXPORT wxSplitterWindow;
 361
 362     // data for the different types of event
 363     union
 364     {
 365         int pos;            // position for SASH_POS_CHANGED event
 366         wxWindow *win;      // window being removed for UNSPLIT event
 367         struct
 368         {
 369             int x, y;
 370         } pt;               // position of double click for DCLICK event
 371     } m_data;
 372
 373     DECLARE_DYNAMIC_CLASS_NO_COPY(wxSplitterEvent)
 374 };
 375
 376 typedef void (wxEvtHandler::*wxSplitterEventFunction)(wxSplitterEvent&);
 377
 378 #define EVT_SPLITTER_SASH_POS_CHANGED(id, fn)                               \
 379   DECLARE_EVENT_TABLE_ENTRY(                                                \
 380     wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGED,                                \
 381     id,                                                                     \
 382     wxID_ANY,                                                               \
 383     (wxObjectEventFunction)(wxEventFunction) wxStaticCastEvent( wxSplitterEventFunction, &fn ),  \
 384     NULL                                                                    \
 385   ),
 386
 387 #define EVT_SPLITTER_SASH_POS_CHANGING(id, fn)                              \
 388   DECLARE_EVENT_TABLE_ENTRY(                                                \
 389     wxEVT_COMMAND_SPLITTER_SASH_POS_CHANGING,                               \
 390     id,                                                                     \
 391     wxID_ANY,                                                               \
 392     (wxObjectEventFunction)(wxEventFunction) wxStaticCastEvent( wxSplitterEventFunction, &fn ),  \
 393     NULL                                                                    \
 394   ),
 395
 396 #define EVT_SPLITTER_DCLICK(id, fn)                                         \
 397   DECLARE_EVENT_TABLE_ENTRY(                                                \
 398     wxEVT_COMMAND_SPLITTER_DOUBLECLICKED,                                   \
 399     id,                                                                     \
 400     wxID_ANY,                                                               \
 401     (wxObjectEventFunction)(wxEventFunction) wxStaticCastEvent( wxSplitterEventFunction, &fn ),  \
 402     NULL                                                                    \
 403   ),
 404
 405 #define EVT_SPLITTER_UNSPLIT(id, fn)                                        \
 406   DECLARE_EVENT_TABLE_ENTRY(                                                \
 407     wxEVT_COMMAND_SPLITTER_UNSPLIT,                                         \
 408     id,                                                                     \
 409     wxID_ANY,                                                               \
 410     (wxObjectEventFunction)(wxEventFunction) wxStaticCastEvent( wxSplitterEventFunction, &fn ),  \
 411     NULL                                                                    \
 412   ),
 413
 414 #endif // __SPLITTERH_G__