interface/wx/scrolwin.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        scrolwin.h
   3 // Purpose:     interface of wxScrolled template
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows licence
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /**
  10     Possible values for the second argument of wxScrolled::ShowScrollbars().
  11  */
  12 enum wxScrollbarVisibility
  13 {
  14     wxSHOW_SB_NEVER = -1,   ///< Never show the scrollbar at all.
  15     wxSHOW_SB_DEFAULT,      ///< Show scrollbar only if it is needed.
  16     wxSHOW_SB_ALWAYS        ///< Always show scrollbar, even if not needed.
  17 };
  18
  19 /**
  20
  21     The wxScrolled class manages scrolling for its client area, transforming
  22     the coordinates according to the scrollbar positions, and setting the
  23     scroll positions, thumb sizes and ranges according to the area in view.
  24
  25     There are two commonly used (but not the only possible!) specializations of
  26     this class:
  27
  28     - ::wxScrolledWindow, aka wxScrolled<wxPanel>, is equivalent to
  29       ::wxScrolledWindow from earlier versions. Derived from wxPanel, it shares
  30       wxPanel's behaviour with regard to TAB traversal and focus handling. Use
  31       this if the scrolled window will have child controls.
  32
  33     - ::wxScrolledCanvas, aka wxScrolled<wxWindow>, derives from wxWindow and
  34       so doesn't handle children specially. This is suitable e.g. for
  35       implementing scrollable controls such as tree or list controls.
  36
  37     Starting from version 2.4 of wxWidgets, there are several ways to use a
  38     ::wxScrolledWindow (and now wxScrolled). In particular, there are
  39     three ways to set the size of the scrolling area:
  40
  41     One way is to set the scrollbars directly using a call to SetScrollbars().
  42     This is the way it used to be in any previous version of wxWidgets and it
  43     will be kept for backwards compatibility.
  44
  45     An additional method of manual control, which requires a little less
  46     computation of your own, is to set the total size of the scrolling area by
  47     calling either wxWindow::SetVirtualSize(), or wxWindow::FitInside(), and
  48     setting the scrolling increments for it by calling SetScrollRate().
  49     Scrolling in some orientation is enabled by setting a non-zero increment
  50     for it.
  51
  52     The most automatic and newest way is to simply let sizers determine the
  53     scrolling area. This is now the default when you set an interior sizer into
  54     a wxScrolled with wxWindow::SetSizer().  The scrolling area will be
  55     set to the size requested by the sizer and the scrollbars will be assigned
  56     for each orientation according to the need for them and the scrolling
  57     increment set by SetScrollRate().  As above, scrolling is only enabled in
  58     orientations with a non-zero increment.  You can influence the minimum size
  59     of the scrolled area controlled by a sizer by calling
  60     wxWindow::SetVirtualSizeHints(). (Calling SetScrollbars() has analogous
  61     effects in wxWidgets 2.4 -- in later versions it may not continue to
  62     override the sizer.)
  63
  64     Note that if maximum size hints are still supported by
  65     wxWindow::SetVirtualSizeHints(), use them at your own dire risk. They may
  66     or may not have been removed for 2.4, but it really only makes sense to set
  67     minimum size hints here.  We should probably replace
  68     wxWindow::SetVirtualSizeHints() with wxWindow::SetMinVirtualSize() or
  69     similar and remove it entirely in future.
  70
  71     @todo review docs for this class replacing SetVirtualSizeHints() with
  72           SetMinClientSize().
  73
  74     As with all windows, an application can draw onto a wxScrolled using a
  75     @ref overview_dc "device context".
  76
  77     You have the option of handling the OnPaint handler or overriding the
  78     wxScrolled::OnDraw() function, which is passed a pre-scrolled device
  79     context (prepared by wxScrolled::DoPrepareDC()).
  80
  81     If you don't wish to calculate your own scrolling, you must call
  82     DoPrepareDC() when not drawing from within OnDraw(), to set the device
  83     origin for the device context according to the current scroll position.
  84
  85     A wxScrolled will normally scroll itself and therefore its child windows
  86     as well. It might however be desired to scroll a different window than
  87     itself: e.g. when designing a spreadsheet, you will normally only have to
  88     scroll the (usually white) cell area, whereas the (usually grey) label area
  89     will scroll very differently. For this special purpose, you can call
  90     SetTargetWindow() which means that pressing the scrollbars will scroll a
  91     different window.
  92
  93     Note that the underlying system knows nothing about scrolling coordinates,
  94     so that all system functions (mouse events, expose events, refresh calls
  95     etc) as well as the position of subwindows are relative to the "physical"
  96     origin of the scrolled window. If the user insert a child window at
  97     position (10,10) and scrolls the window down 100 pixels (moving the child
  98     window out of the visible area), the child window will report a position
  99     of (10,-90).
 100
 101     @beginStyleTable
 102     @style{wxHSCROLL}
 103            If this style is specified and ::wxVSCROLL isn't, the window will be
 104            scrollable only in horizontal direction (by default, i.e. if neither
 105            this style nor ::wxVSCROLL is specified, it scrolls in both
 106            directions).
 107     @style{wxVSCROLL}
 108            If this style is specified and ::wxHSCROLL isn't, the window will be
 109            scrollable only in vertical direction (by default, i.e. if neither
 110            this style nor ::wxHSCROLL is specified, it scrolls in both
 111            directions).
 112     @style{wxALWAYS_SHOW_SB}
 113            Since wxWidgets 2.9.5, specifying this style makes the window always
 114            show its scrollbars, even if they are not used. See ShowScrollbars().
 115     @style{wxRETAINED}
 116            Uses a backing pixmap to speed refreshes. Motif only.
 117     @endStyleTable
 118
 119
 120     @beginEventEmissionTable{wxScrollWinEvent}
 121     @event{EVT_SCROLLWIN(func)}
 122         Process all scroll events.
 123     @event{EVT_SCROLLWIN_TOP(func)}
 124         Process @c wxEVT_SCROLLWIN_TOP scroll-to-top events.
 125     @event{EVT_SCROLLWIN_BOTTOM(func)}
 126         Process @c wxEVT_SCROLLWIN_BOTTOM scroll-to-bottom events.
 127     @event{EVT_SCROLLWIN_LINEUP(func)}
 128         Process @c wxEVT_SCROLLWIN_LINEUP line up events.
 129     @event{EVT_SCROLLWIN_LINEDOWN(func)}
 130         Process @c wxEVT_SCROLLWIN_LINEDOWN line down events.
 131     @event{EVT_SCROLLWIN_PAGEUP(func)}
 132         Process @c wxEVT_SCROLLWIN_PAGEUP page up events.
 133     @event{EVT_SCROLLWIN_PAGEDOWN(func)}
 134         Process @c wxEVT_SCROLLWIN_PAGEDOWN page down events.
 135     @event{EVT_SCROLLWIN_THUMBTRACK(func)}
 136         Process @c wxEVT_SCROLLWIN_THUMBTRACK thumbtrack events
 137         (frequent events sent as the user drags the thumbtrack).
 138     @event{EVT_SCROLLWIN_THUMBRELEASE(func)}
 139         Process @c wxEVT_SCROLLWIN_THUMBRELEASE thumb release events.
 140     @endEventTable
 141
 142     @note
 143         Don't confuse wxScrollWinEvents generated by this class with
 144         wxScrollEvent objects generated by wxScrollBar and wxSlider.
 145
 146
 147     @remarks
 148     Use wxScrolled for applications where the user scrolls by a fixed amount,
 149     and where a 'page' can be interpreted to be the current visible portion of
 150     the window. For more sophisticated applications, use the wxScrolled
 151     implementation as a guide to build your own scroll behaviour or use
 152     wxVScrolledWindow or its variants.
 153
 154     @since The wxScrolled template exists since version 2.9.0. In older versions,
 155            only ::wxScrolledWindow (equivalent of wxScrolled<wxPanel>) was
 156            available.
 157
 158     @library{wxcore}
 159     @category{miscwnd}
 160
 161     @see wxScrollBar, wxClientDC, wxPaintDC,
 162          wxVScrolledWindow, wxHScrolledWindow, wxHVScrolledWindow,
 163 */
 164 template<class T>
 165 class wxScrolled : public T
 166 {
 167 public:
 168     /// Default constructor.
 169     wxScrolled();
 170
 171     /**
 172         Constructor.
 173
 174         @param parent
 175             Parent window.
 176         @param id
 177             Window identifier. The value @c wxID_ANY indicates a default value.
 178         @param pos
 179             Window position. If a position of ::wxDefaultPosition is specified
 180             then a default position is chosen.
 181         @param size
 182             Window size. If a size of ::wxDefaultSize is specified then the
 183             window is sized appropriately.
 184         @param style
 185             Window style. See wxScrolled.
 186         @param name
 187             Window name.
 188
 189         @remarks The window is initially created without visible scrollbars.
 190                  Call SetScrollbars() to specify how big the virtual window
 191                  size should be.
 192     */
 193     wxScrolled(wxWindow* parent, wxWindowID id = -1,
 194                const wxPoint& pos = wxDefaultPosition,
 195                const wxSize& size = wxDefaultSize,
 196                long style = wxHSCROLL | wxVSCROLL,
 197                const wxString& name = "scrolledWindow");
 198
 199     /**
 200         Translates the logical coordinates to the device ones. For example, if
 201         a window is scrolled 10 pixels to the bottom, the device coordinates of
 202         the origin are (0, 0) (as always), but the logical coordinates are (0,
 203         10) and so the call to CalcScrolledPosition(0, 10, xx, yy) will return
 204         0 in yy.
 205
 206         @beginWxPerlOnly
 207         In wxPerl this method takes two parameters and returns a
 208         2-element list (xx, yy).
 209         @endWxPerlOnly
 210
 211         @see CalcUnscrolledPosition()
 212     */
 213     void CalcScrolledPosition(int x, int y, int* xx, int* yy) const;
 214     wxPoint CalcScrolledPosition(const wxPoint& pt) const;
 215
 216     /**
 217         Translates the device coordinates to the logical ones. For example, if
 218         a window is scrolled 10 pixels to the bottom, the device coordinates of
 219         the origin are (0, 0) (as always), but the logical coordinates are (0,
 220         10) and so the call to CalcUnscrolledPosition(0, 0, xx, yy) will return
 221         10 in yy.
 222
 223         @beginWxPerlOnly
 224         In wxPerl this method takes two parameters and returns a
 225         2-element list (xx, yy).
 226         @endWxPerlOnly
 227
 228         @see CalcScrolledPosition()
 229     */
 230     void CalcUnscrolledPosition(int x, int y, int* xx, int* yy) const;
 231     wxPoint CalcUnscrolledPosition(const wxPoint& pt) const;
 232
 233     /**
 234         Creates the window for two-step construction. Derived classes
 235         should call or replace this function. See wxScrolled::wxScrolled()
 236         for details.
 237     */
 238     bool Create(wxWindow* parent, wxWindowID id = -1,
 239                 const wxPoint& pos = wxDefaultPosition,
 240                 const wxSize& size = wxDefaultSize,
 241                 long style = wxHSCROLL | wxVSCROLL,
 242                 const wxString& name = "scrolledWindow");
 243
 244     /**
 245         Disable use of keyboard keys for scrolling.
 246
 247         By default cursor movement keys (including Home, End, Page Up and Down)
 248         are used to scroll the window appropriately. If the derived class uses
 249         these keys for something else, e.g. changing the currently selected
 250         item, this function can be used to disable this behaviour as it's not
 251         only not necessary then but can actually be actively harmful if another
 252         object forwards a keyboard event corresponding to one of the above keys
 253         to us using ProcessWindowEvent() because the event will always be
 254         processed which can be undesirable.
 255
 256         @since 2.9.1
 257     */
 258     void DisableKeyboardScrolling();
 259
 260     /**
 261         Call this function to prepare the device context for drawing a scrolled
 262         image.
 263
 264         It sets the device origin according to the current scroll position.
 265         DoPrepareDC() is called automatically within the default @c wxEVT_PAINT
 266         event handler, so your OnDraw() override will be passed an already
 267         'pre-scrolled' device context. However, if you wish to draw from
 268         outside of OnDraw() (e.g. from your own @c wxEVT_PAINT handler), you
 269         must call this function yourself.
 270
 271         For example:
 272         @code
 273         void MyWindow::OnEvent(wxMouseEvent& event)
 274         {
 275           wxClientDC dc(this);
 276           DoPrepareDC(dc);
 277
 278           dc.SetPen(*wxBLACK_PEN);
 279           float x, y;
 280           event.Position(&x, &y);
 281           if (xpos > -1 && ypos > -1 && event.Dragging())
 282           {
 283             dc.DrawLine(xpos, ypos, x, y);
 284           }
 285           xpos = x;
 286           ypos = y;
 287         }
 288         @endcode
 289
 290         Notice that the function sets the origin by moving it relatively to the
 291         current origin position, so you shouldn't change the origin before
 292         calling DoPrepareDC() or, if you do, reset it to (0, 0) later. If you
 293         call DoPrepareDC() immediately after device context creation, as in the
 294         example above, this problem doesn't arise, of course, so it is
 295         customary to do it like this.
 296     */
 297     void DoPrepareDC(wxDC& dc);
 298
 299     /**
 300         Enable or disable use of wxWindow::ScrollWindow() for scrolling.
 301
 302         By default, when a scrolled window is logically scrolled,
 303         wxWindow::ScrollWindow() is called on the underlying window which
 304         scrolls the window contents and only invalidates the part of the window
 305         newly brought into view. If @false is passed as an argument, then this
 306         "physical scrolling" is disabled and the window is entirely invalidated
 307         whenever it is scrolled by calling wxWindow::Refresh().
 308
 309         It should be rarely necessary to disable physical scrolling, so this
 310         method shouldn't be called in normal circumstances.
 311
 312         @param xScrolling
 313             If @true, enables physical scrolling in the x direction.
 314         @param yScrolling
 315             If @true, enables physical scrolling in the y direction.
 316     */
 317     void EnableScrolling(bool xScrolling, bool yScrolling);
 318
 319     /**
 320         Set the scrollbar visibility.
 321
 322         By default the scrollbar in the corresponding direction is only shown
 323         if it is needed, i.e. if the virtual size of the scrolled window in
 324         this direction is greater than the current physical window size. Using
 325         this function the scrollbar visibility can be changed to be:
 326             - wxSHOW_SB_ALWAYS: To always show the scrollbar, even if it is
 327                 not needed currently (wxALWAYS_SHOW_SB style can be used during
 328                 the window creation to achieve the same effect but it applies
 329                 in both directions).
 330             - wxSHOW_SB_NEVER: To never show the scrollbar at all. In this case
 331                 the program should presumably provide some other way for the
 332                 user to scroll the window.
 333             - wxSHOW_SB_DEFAULT: To restore the default behaviour described
 334                 above.
 335
 336         @param horz
 337             The desired visibility for the horizontal scrollbar.
 338         @param vert
 339             The desired visibility for the vertical scrollbar.
 340
 341         @since 2.9.0
 342      */
 343     void ShowScrollbars(wxScrollbarVisibility horz, wxScrollbarVisibility vert);
 344
 345     /**
 346         Get the number of pixels per scroll unit (line), in each direction, as
 347         set by SetScrollbars(). A value of zero indicates no scrolling in that
 348         direction.
 349
 350         @param xUnit
 351             Receives the number of pixels per horizontal unit.
 352         @param yUnit
 353             Receives the number of pixels per vertical unit.
 354
 355         @beginWxPerlOnly
 356         In wxPerl this method takes no parameters and returns a
 357         2-element list (xUnit, yUnit).
 358         @endWxPerlOnly
 359
 360         @see SetScrollbars(), GetVirtualSize()
 361     */
 362     void GetScrollPixelsPerUnit(int* xUnit, int* yUnit) const;
 363
 364     /**
 365         Get the position at which the visible portion of the window starts.
 366
 367         @param x
 368             Receives the first visible x position in scroll units.
 369         @param y
 370             Receives the first visible y position in scroll units.
 371
 372         @remarks
 373             If either of the scrollbars is not at the home position, @a x
 374             and/or @a y will be greater than zero.
 375             Combined with wxWindow::GetClientSize(), the application can use this
 376             function to efficiently redraw only the visible portion of the window.
 377             The positions are in logical scroll units, not pixels, so to convert
 378             to pixels you will have to multiply by the number of pixels per scroll
 379             increment.
 380
 381         @beginWxPerlOnly
 382         In wxPerl this method takes no parameters and returns a
 383         2-element list (x, y).
 384         @endWxPerlOnly
 385
 386         @see SetScrollbars(), Scroll()
 387     */
 388     void GetViewStart(int* x, int* y) const;
 389
 390     /**
 391         This is a simple overload of GetViewStart(int*,int*); see that function
 392         for more info.
 393     */
 394     wxPoint GetViewStart() const;
 395
 396     /**
 397         Gets the size in device units of the scrollable window area (as
 398         opposed to the client size, which is the area of the window currently
 399         visible).
 400
 401         @param x
 402             Receives the length of the scrollable window, in pixels.
 403         @param y
 404             Receives the height of the scrollable window, in pixels.
 405
 406         @remarks Use wxDC::DeviceToLogicalX() and wxDC::DeviceToLogicalY() to
 407                  translate these units to logical units.
 408
 409         @beginWxPerlOnly
 410         In wxPerl this method takes no parameters and returns a
 411         2-element list (xUnit, yUnit).
 412         @endWxPerlOnly
 413
 414         @see SetScrollbars(), GetScrollPixelsPerUnit()
 415     */
 416     void GetVirtualSize(int* x, int* y) const;
 417
 418     /**
 419         Motif only: @true if the window has a backing bitmap.
 420     */
 421     bool IsRetained() const;
 422
 423     /**
 424         Called by the default paint event handler to allow the application to
 425         define painting behaviour without having to worry about calling
 426         DoPrepareDC().
 427
 428         Instead of overriding this function you may also just process the paint
 429         event in the derived class as usual, but then you will have to call
 430         DoPrepareDC() yourself.
 431     */
 432     virtual void OnDraw(wxDC& dc);
 433
 434     /**
 435         This function is for backwards compatibility only and simply calls
 436         DoPrepareDC() now. Notice that it is not called by the default paint
 437         event handle (DoPrepareDC() is), so overriding this method in your
 438         derived class is useless.
 439     */
 440     void PrepareDC(wxDC& dc);
 441
 442     /**
 443         Scrolls a window so the view start is at the given point.
 444
 445         @param x
 446             The x position to scroll to, in scroll units.
 447         @param y
 448             The y position to scroll to, in scroll units.
 449
 450         @remarks The positions are in scroll units, not pixels, so to convert to
 451                  pixels you will have to multiply by the number of
 452                  pixels per scroll increment. If either parameter is
 453                  ::wxDefaultCoord (-1), that position will be ignored (no change
 454                  in that direction).
 455
 456         @see SetScrollbars(), GetScrollPixelsPerUnit()
 457     */
 458     void Scroll(int x, int y);
 459
 460     /**
 461         This is an overload of Scroll(int,int); see that function for more info.
 462     */
 463     void Scroll(const wxPoint& pt);
 464
 465     /**
 466         Set the horizontal and vertical scrolling increment only. See the
 467         pixelsPerUnit parameter in SetScrollbars().
 468     */
 469     void SetScrollRate(int xstep, int ystep);
 470
 471     /**
 472         Sets up vertical and/or horizontal scrollbars.
 473
 474         The first pair of parameters give the number of pixels per 'scroll
 475         step', i.e. amount moved when the up or down scroll arrows are pressed.
 476         The second pair gives the length of scrollbar in scroll steps, which
 477         sets the size of the virtual window.
 478
 479         @a xPos and @a yPos optionally specify a position to scroll to
 480         immediately.
 481
 482         For example, the following gives a window horizontal and vertical
 483         scrollbars with 20 pixels per scroll step, and a size of 50 steps (1000
 484         pixels) in each direction:
 485         @code
 486         window->SetScrollbars(20, 20, 50, 50);
 487         @endcode
 488
 489         wxScrolled manages the page size itself, using the current client
 490         window size as the page size.
 491
 492         Note that for more sophisticated scrolling applications, for example
 493         where scroll steps may be variable according to the position in the
 494         document, it will be necessary to derive a new class from wxWindow,
 495         overriding OnSize() and adjusting the scrollbars appropriately.
 496
 497         @param pixelsPerUnitX
 498             Pixels per scroll unit in the horizontal direction.
 499         @param pixelsPerUnitY
 500             Pixels per scroll unit in the vertical direction.
 501         @param noUnitsX
 502             Number of units in the horizontal direction.
 503         @param noUnitsY
 504             Number of units in the vertical direction.
 505         @param xPos
 506             Position to initialize the scrollbars in the horizontal direction,
 507             in scroll units.
 508         @param yPos
 509             Position to initialize the scrollbars in the vertical direction, in
 510             scroll units.
 511         @param noRefresh
 512             Will not refresh window if @true.
 513
 514         @see wxWindow::SetVirtualSize()
 515     */
 516     void SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
 517                        int noUnitsX,
 518                        int noUnitsY,
 519                        int xPos = 0,
 520                        int yPos = 0,
 521                        bool noRefresh = false);
 522
 523     /**
 524         Call this function to tell wxScrolled to perform the actual scrolling
 525         on a different window (and not on itself).
 526
 527         This method is useful when only a part of the window should be
 528         scrolled. A typical example is a control consisting of a fixed header
 529         and the scrollable contents window: the scrollbars are attached to the
 530         main window itself, hence it, and not the contents window must be
 531         derived from wxScrolled, but only the contents window scrolls when the
 532         scrollbars are used. To implement such setup, you need to call this
 533         method with the contents window as argument.
 534
 535         Notice that if this method is used, GetSizeAvailableForScrollTarget()
 536         method must be overridden.
 537     */
 538     void SetTargetWindow(wxWindow *window);
 539     wxWindow *GetTargetWindow() const;
 540
 541
 542     void SetTargetRect(const wxRect& rect);
 543     wxRect GetTargetRect() const;
 544
 545     int GetScrollPageSize(int orient) const;
 546     void SetScrollPageSize(int orient, int pageSize);
 547     int GetScrollLines( int orient ) const;
 548     void SetScale(double xs, double ys);
 549     double GetScaleX() const;
 550     double GetScaleY() const;
 551
 552     virtual void AdjustScrollbars();
 553
 554     /**
 555        Are we generating the autoscroll events?
 556      */
 557     bool IsAutoScrolling() const;
 558
 559     /**
 560        Stop generating the scroll events when mouse is held outside the
 561        window.
 562      */
 563     void StopAutoScrolling();
 564
 565     /**
 566        This method can be overridden in a derived class to forbid sending the
 567        auto scroll events - note that unlike StopAutoScrolling() it doesn't
 568        stop the timer, so it will be called repeatedly and will typically
 569        return different values depending on the current mouse position
 570
 571        The base class version just returns true.
 572     */
 573     virtual bool SendAutoScrollEvents(wxScrollWinEvent& event) const;
 574
 575
 576 protected:
 577     /**
 578         Function which must be overridden to implement the size available for
 579         the scroll target for the given size of the main window.
 580
 581         This method must be overridden if SetTargetWindow() is used (it is
 582         never called otherwise). The implementation should decrease the @a size
 583         to account for the size of the non-scrollable parts of the main window
 584         and return only the size available for the scrollable window itself.
 585         E.g. in the example given in SetTargetWindow() documentation the
 586         function would subtract the height of the header window from the
 587         vertical component of @a size.
 588      */
 589     virtual wxSize GetSizeAvailableForScrollTarget(const wxSize& size);
 590 };
 591
 592
 593 /**
 594     Scrolled window derived from wxPanel.
 595
 596     See wxScrolled for a detailed description.
 597
 598     @note Note that because this class derives from wxPanel, it shares its
 599           behaviour with regard to TAB traversal and focus handling (in
 600           particular, it forwards focus to its children). If you don't want
 601           this behaviour, use ::wxScrolledCanvas instead.
 602
 603     @note ::wxScrolledWindow is an alias for wxScrolled<wxPanel> since version
 604           2.9.0. In older versions, it was a standalone class.
 605
 606     @library{wxcore}
 607     @category{miscwnd}
 608
 609     @see wxScrolled, ::wxScrolledCanvas
 610 */
 611 typedef wxScrolled<wxPanel> wxScrolledWindow;
 612
 613 /**
 614     Alias for wxScrolled<wxWindow>. Scrolled window that doesn't have children
 615     and so doesn't need or want special handling of TAB traversal.
 616
 617     @since 2.9.0
 618
 619     @library{wxcore}
 620     @category{miscwnd}
 621
 622     @see wxScrolled, ::wxScrolledWindow
 623 */
 624 typedef wxScrolled<wxWindow> wxScrolledCanvas;