interface/wx/vscroll.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        vscroll.h
   3 // Purpose:     interface of wxVarHScrollHelper
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows license
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /**
  10     @class wxVarScrollHelperBase
  11
  12     This class provides all common base functionality for scroll calculations
  13     shared among all variable scrolled window implementations as well as
  14     automatic scrollbar functionality, saved scroll positions, controlling
  15     target windows to be scrolled, as well as defining all required virtual
  16     functions that need to be implemented for any orientation specific work.
  17
  18     Documentation of this class is provided specifically for referencing use
  19     of the functions provided by this class for use with the variable scrolled
  20     windows that derive from here. You will likely want to derive your window
  21     from one of the already implemented variable scrolled windows rather than
  22     from wxVarScrollHelperBase directly.
  23
  24     @library{wxcore}
  25     @category{miscwnd}
  26
  27     @see wxHScrolledWindow, wxHVScrolledWindow, wxVScrolledWindow
  28 */
  29 class wxVarScrollHelperBase
  30 {
  31 public:
  32     /**
  33         Constructor taking the target window to be scrolled by this helper
  34         class. This will attach scroll event handlers to the target window to
  35         catch and handle scroll events appropriately.
  36     */
  37     wxVarScrollHelperBase(wxWindow* winToScroll);
  38
  39     /**
  40         Virtual destructor for detaching scroll event handlers attached with
  41         this helper class.
  42     */
  43     virtual ~wxVarScrollHelperBase();
  44
  45     /**
  46         Translates the logical coordinate given to the current device
  47         coordinate. For example, if the window is scrolled 10 units and each
  48         scroll unit represents 10 device units (which may not be the case since
  49         this class allows for variable scroll unit sizes), a call to this
  50         function with a coordinate of 15 will return -85.
  51
  52         @see CalcUnscrolledPosition()
  53     */
  54     int CalcScrolledPosition(int coord) const;
  55
  56     /**
  57         Translates the device coordinate given to the corresponding logical
  58         coordinate. For example, if the window is scrolled 10 units and each
  59         scroll unit represents 10 device units (which may not be the case since
  60         this class allows for variable scroll unit sizes), a call to this
  61         function with a coordinate of 15 will return 115.
  62
  63         @see CalcScrolledPosition()
  64     */
  65     int CalcUnscrolledPosition(int coord) const;
  66
  67     /**
  68         With physical scrolling on (when this is @true), the device origin is
  69         changed properly when a wxPaintDC is prepared, children are actually
  70         moved and laid out properly, and the contents of the window (pixels)
  71         are actually moved. When this is @false, you are responsible for
  72         repainting any invalidated areas of the window yourself to account for
  73         the new scroll position.
  74     */
  75     void EnablePhysicalScrolling(bool scrolling = true);
  76
  77     /**
  78         This function needs to be overridden in the in the derived class to
  79         return the window size with respect to the opposing orientation. If
  80         this is a vertical scrolled window, it should return the height.
  81
  82         @see GetOrientationTargetSize()
  83     */
  84     virtual int GetNonOrientationTargetSize() const = 0;
  85
  86     /**
  87         This function need to be overridden to return the orientation that this
  88         helper is working with, either @c wxHORIZONTAL or @c wxVERTICAL.
  89     */
  90     virtual wxOrientation GetOrientation() const = 0;
  91
  92     /**
  93         This function needs to be overridden in the in the derived class to
  94         return the window size with respect to the orientation this helper is
  95         working with. If this is a vertical scrolled window, it should return
  96         the width.
  97
  98         @see GetNonOrientationTargetSize()
  99     */
 100     virtual int GetOrientationTargetSize() const = 0;
 101
 102     /**
 103         This function will return the target window this helper class is
 104         currently scrolling.
 105
 106         @see SetTargetWindow()
 107     */
 108     virtual wxWindow* GetTargetWindow() const;
 109
 110     /**
 111         Returns the index of the first visible unit based on the scroll
 112         position.
 113     */
 114     size_t GetVisibleBegin() const;
 115
 116     /**
 117         Returns the index of the last visible unit based on the scroll
 118         position. This includes the last unit even if it is only partially
 119         visible.
 120     */
 121     size_t GetVisibleEnd() const;
 122
 123     /**
 124         Returns @true if the given scroll unit is currently visible (even if
 125         only partially visible) or @false otherwise.
 126     */
 127     bool IsVisible(size_t unit) const;
 128
 129     /**
 130         Recalculate all parameters and repaint all units.
 131     */
 132     virtual void RefreshAll();
 133
 134     /**
 135         Normally the window will scroll itself, but in some rare occasions you
 136         might want it to scroll (part of) another window (e.g. a child of it in
 137         order to scroll only a portion the area between the scrollbars like a
 138         spreadsheet where only the cell area will move).
 139
 140         @see GetTargetWindow()
 141     */
 142     virtual void SetTargetWindow(wxWindow* target);
 143
 144     /**
 145         Update the thumb size shown by the scrollbar.
 146     */
 147     virtual void UpdateScrollbar();
 148
 149     /**
 150         Returns the virtual scroll unit under the device unit given accounting
 151         for scroll position or @c wxNOT_FOUND if none (i.e. if it is below the
 152         last item).
 153     */
 154     int VirtualHitTest(wxCoord coord) const;
 155
 156
 157 protected:
 158
 159     /**
 160         This function doesn't have to be overridden but it may be useful to do
 161         so if calculating the units' sizes is a relatively expensive operation
 162         as it gives your code a chance to calculate several of them at once and
 163         cache the result if necessary.
 164
 165         OnGetUnitsSizeHint() is normally called just before OnGetUnitSize() but
 166         you shouldn't rely on the latter being called for all units in the
 167         interval specified here. It is also possible that OnGetUnitSize() will
 168         be called for units outside of this interval, so this is really just a
 169         hint, not a promise.
 170
 171         Finally, note that @a unitMin is inclusive, while @a unitMax is
 172         exclusive.
 173     */
 174     virtual void OnGetUnitsSizeHint(size_t unitMin, size_t unitMax) const;
 175
 176     /**
 177         When the number of scroll units change, we try to estimate the total
 178         size of all units when the full window size is needed (i.e. to
 179         calculate the scrollbar thumb size). This is a rather expensive
 180         operation in terms of unit access, so if the user code may estimate the
 181         average size better or faster than we do, it should override this
 182         function to implement its own logic. This function should return the
 183         best guess for the total virtual window size.
 184
 185         @note Although returning a totally wrong value would still work, it
 186               risks resulting in very strange scrollbar behaviour so this
 187               function should really try to make the best guess possible.
 188     */
 189     virtual wxCoord EstimateTotalSize() const;
 190
 191     /**
 192         This function must be overridden in the derived class, and should
 193         return the size of the given unit in pixels.
 194     */
 195     virtual wxCoord OnGetUnitSize(size_t unit) const = 0;
 196 };
 197
 198
 199
 200 /**
 201     @class wxVarVScrollHelper
 202
 203     This class provides functions wrapping the wxVarScrollHelperBase class,
 204     targeted for vertical-specific scrolling.
 205
 206     Like wxVarScrollHelperBase, this class is mostly only useful to those
 207     classes built into wxWidgets deriving from here, and this documentation is
 208     mostly only provided for referencing the functions provided by this class.
 209     You will likely want to derive your window from wxVScrolledWindow rather
 210     than from here directly.
 211
 212     @library{wxcore}
 213     @category{miscwnd}
 214
 215     @see wxHScrolledWindow, wxHVScrolledWindow, wxVScrolledWindow
 216 */
 217 class wxVarVScrollHelper : public wxVarScrollHelperBase
 218 {
 219 public:
 220     /**
 221         Constructor taking the target window to be scrolled by this helper
 222         class. This will attach scroll event handlers to the target window to
 223         catch and handle scroll events appropriately.
 224     */
 225     wxVarVScrollHelper(wxWindow* winToScroll);
 226
 227     /**
 228         Returns the number of rows the target window contains.
 229
 230         @see SetRowCount()
 231     */
 232     size_t GetRowCount() const;
 233
 234     /**
 235         Returns the index of the first visible row based on the scroll
 236         position.
 237     */
 238     size_t GetVisibleRowsBegin() const;
 239
 240     /**
 241         Returns the index of the last visible row based on the scroll position.
 242         This includes the last row even if it is only partially visible.
 243     */
 244     size_t GetVisibleRowsEnd() const;
 245
 246     /**
 247         Returns @true if the given row is currently visible (even if only
 248         partially visible) or @false otherwise.
 249     */
 250     bool IsRowVisible(size_t row) const;
 251
 252     /**
 253         Triggers a refresh for just the given row's area of the window if it's
 254         visible.
 255     */
 256     virtual void RefreshRow(size_t row);
 257
 258     /**
 259         Triggers a refresh for the area between the specified range of rows
 260         given (inclusively).
 261     */
 262     virtual void RefreshRows(size_t from, size_t to);
 263
 264     /**
 265         Scroll by the specified number of pages which may be positive (to
 266         scroll down) or negative (to scroll up).
 267     */
 268     virtual bool ScrollRowPages(int pages);
 269
 270     /**
 271         Scroll by the specified number of rows which may be positive (to scroll
 272         down) or negative (to scroll up).
 273
 274         @return @true if the window was scrolled, @false otherwise (for
 275                 example, if we're trying to scroll down but we are already
 276                 showing the last row).
 277     */
 278     virtual bool ScrollRows(int rows);
 279
 280     /**
 281         Scroll to the specified row. It will become the first visible row in
 282         the window.
 283
 284         @return @true if we scrolled the window, @false if nothing was done.
 285     */
 286     bool ScrollToRow(size_t row);
 287
 288     /**
 289         Set the number of rows the window contains. The derived class must
 290         provide the heights for all rows with indices up to the one given here
 291         in it's OnGetRowHeight() implementation.
 292
 293         @see GetRowCount()
 294     */
 295     void SetRowCount(size_t rowCount);
 296
 297 protected:
 298
 299     /**
 300         This function doesn't have to be overridden but it may be useful to do
 301         so if calculating the rows' sizes is a relatively expensive operation
 302         as it gives your code a chance to calculate several of them at once and
 303         cache the result if necessary.
 304
 305         OnGetRowsHeightHint() is normally called just before OnGetRowHeight()
 306         but you shouldn't rely on the latter being called for all rows in the
 307         interval specified here. It is also possible that OnGetRowHeight() will
 308         be called for units outside of this interval, so this is really just a
 309         hint, not a promise.
 310
 311         Finally, note that @a rowMin is inclusive, while @a rowMax is
 312         exclusive.
 313     */
 314     virtual void OnGetRowsHeightHint(size_t rowMin, size_t rowMax) const;
 315
 316     /**
 317         This class forwards calls from EstimateTotalSize() to this function so
 318         derived classes can override either just the height or the width
 319         estimation, or just estimate both differently if desired in any
 320         wxHVScrolledWindow derived class.
 321
 322         @note This function will not be called if EstimateTotalSize() is
 323               overridden in your derived class.
 324     */
 325     virtual wxCoord EstimateTotalHeight() const;
 326
 327     /**
 328         This function must be overridden in the derived class, and should
 329         return the height of the given row in pixels.
 330     */
 331     virtual wxCoord OnGetRowHeight(size_t row) const = 0;
 332 };
 333
 334
 335
 336 /**
 337     @class wxVarHScrollHelper
 338
 339     This class provides functions wrapping the wxVarScrollHelperBase class,
 340     targeted for horizontal-specific scrolling.
 341
 342     Like wxVarScrollHelperBase, this class is mostly only useful to those
 343     classes built into wxWidgets deriving from here, and this documentation is
 344     mostly only provided for referencing the functions provided by this class.
 345     You will likely want to derive your window from wxHScrolledWindow rather
 346     than from here directly.
 347
 348     @library{wxcore}
 349     @category{miscwnd}
 350
 351     @see wxHScrolledWindow, wxHVScrolledWindow, wxVScrolledWindow
 352 */
 353 class wxVarHScrollHelper : public wxVarScrollHelperBase
 354 {
 355 public:
 356     /**
 357         Constructor taking the target window to be scrolled by this helper
 358         class. This will attach scroll event handlers to the target window to
 359         catch and handle scroll events appropriately.
 360     */
 361     wxVarHScrollHelper(wxWindow* winToScroll);
 362
 363     /**
 364         Returns the number of columns the target window contains.
 365
 366         @see SetColumnCount()
 367     */
 368     size_t GetColumnCount() const;
 369
 370     /**
 371         Returns the index of the first visible column based on the scroll
 372         position.
 373     */
 374     size_t GetVisibleColumnsBegin() const;
 375
 376     /**
 377         Returns the index of the last visible column based on the scroll
 378         position. This includes the last column even if it is only partially
 379         visible.
 380     */
 381     size_t GetVisibleColumnsEnd() const;
 382
 383     /**
 384         Returns @true if the given column is currently visible (even if only
 385         partially visible) or @false otherwise.
 386     */
 387     bool IsColumnVisible(size_t column) const;
 388
 389     /**
 390         Triggers a refresh for just the given column's area of the window if
 391         it's visible.
 392     */
 393     virtual void RefreshColumn(size_t column);
 394
 395     /**
 396         Triggers a refresh for the area between the specified range of columns
 397         given (inclusively).
 398     */
 399     virtual void RefreshColumns(size_t from, size_t to);
 400
 401     /**
 402         Scroll by the specified number of pages which may be positive (to
 403         scroll right) or negative (to scroll left).
 404     */
 405     virtual bool ScrollColumnPages(int pages);
 406
 407     /**
 408         Scroll by the specified number of columns which may be positive (to
 409         scroll right) or negative (to scroll left).
 410
 411         @return @true if the window was scrolled, @false otherwise (for
 412                 example, if we're trying to scroll right but we are already
 413                 showing the last column).
 414     */
 415     virtual bool ScrollColumns(int columns);
 416
 417     /**
 418         Scroll to the specified column. It will become the first visible column
 419         in the window.
 420
 421         @return @true if we scrolled the window, @false if nothing was done.
 422     */
 423     bool ScrollToColumn(size_t column);
 424
 425     /**
 426         Set the number of columns the window contains. The derived class must
 427         provide the widths for all columns with indices up to the one given
 428         here in it's OnGetColumnWidth() implementation.
 429
 430         @see GetColumnCount()
 431     */
 432     void SetColumnCount(size_t columnCount);
 433
 434 protected:
 435
 436     /**
 437         This class forwards calls from EstimateTotalSize() to this function so
 438         derived classes can override either just the height or the width
 439         estimation, or just estimate both differently if desired in any
 440         wxHVScrolledWindow derived class.
 441
 442         @note This function will not be called if EstimateTotalSize() is
 443               overridden in your derived class.
 444     */
 445     virtual wxCoord EstimateTotalWidth() const;
 446
 447     /**
 448         This function doesn't have to be overridden but it may be useful to do
 449         so if calculating the columns' sizes is a relatively expensive
 450         operation as it gives your code a chance to calculate several of them
 451         at once and cache the result if necessary.
 452
 453         OnGetColumnsWidthHint() is normally called just before
 454         OnGetColumnWidth() but you shouldn't rely on the latter being called
 455         for all columns in the interval specified here. It is also possible
 456         that OnGetColumnWidth() will be called for units outside of this
 457         interval, so this is really just a hint, not a promise.
 458
 459         Finally, note that @a columnMin is inclusive, while @a columnMax is
 460         exclusive.
 461     */
 462     virtual void OnGetColumnsWidthHint(size_t columnMin,
 463                                        size_t columnMax) const;
 464
 465     /**
 466         This function must be overridden in the derived class, and should
 467         return the width of the given column in pixels.
 468     */
 469     virtual wxCoord OnGetColumnWidth(size_t column) const = 0;
 470 };
 471
 472
 473
 474 /**
 475     @class wxVarHVScrollHelper
 476
 477     This class provides functions wrapping the wxVarHScrollHelper and
 478     wxVarVScrollHelper classes, targeted for scrolling a window in both axis.
 479     Since this class is also the join class of the horizontal and vertical
 480     scrolling functionality, it also addresses some wrappers that help avoid
 481     the need to specify class scope in your wxHVScrolledWindow derived class
 482     when using wxVarScrollHelperBase functionality.
 483
 484     Like all three of it's scroll helper base classes, this class is mostly
 485     only useful to those classes built into wxWidgets deriving from here, and
 486     this documentation is mostly only provided for referencing the functions
 487     provided by this class. You will likely want to derive your window from
 488     wxHVScrolledWindow rather than from here directly.
 489
 490     @library{wxcore}
 491     @category{miscwnd}
 492
 493     @see wxHScrolledWindow, wxHVScrolledWindow, wxVScrolledWindow
 494 */
 495 class wxVarHVScrollHelper : public wxVarVScrollHelper,
 496                              public wxVarHScrollHelper
 497 {
 498 public:
 499     /**
 500         Constructor taking the target window to be scrolled by this helper
 501         class. This will attach scroll event handlers to the target window to
 502         catch and handle scroll events appropriately.
 503     */
 504     wxVarHVScrollHelper(wxWindow* winToScroll);
 505
 506     /**
 507         With physical scrolling on (when this is @true), the device origin is
 508         changed properly when a wxPaintDC is prepared, children are actually
 509         moved and laid out properly, and the contents of the window (pixels)
 510         are actually moved. When this is @false, you are responsible for
 511         repainting any invalidated areas of the window yourself to account for
 512         the new scroll position.
 513
 514         @param vscrolling
 515             Specifies if physical scrolling should be turned on when scrolling
 516             vertically.
 517         @param hscrolling
 518             Specifies if physical scrolling should be turned on when scrolling
 519             horizontally.
 520     */
 521     void EnablePhysicalScrolling(bool vscrolling = true,
 522                                  bool hscrolling = true);
 523
 524     /**
 525         Returns the number of columns and rows the target window contains.
 526
 527         @see SetRowColumnCount()
 528     */
 529     wxSize GetRowColumnCount() const;
 530
 531     /**
 532         Returns the index of the first visible column and row based on the
 533         current scroll position.
 534     */
 535     wxPosition GetVisibleBegin() const;
 536
 537     /**
 538         Returns the index of the last visible column and row based on the
 539         scroll position. This includes any partially visible columns or rows.
 540     */
 541     wxPosition GetVisibleEnd() const;
 542
 543     //@{
 544     /**
 545         Returns @true if both the given row and column are currently visible
 546         (even if only partially visible) or @false otherwise.
 547     */
 548     bool IsVisible(size_t row, size_t column) const;
 549     bool IsVisible(const wxPosition& pos) const;
 550     //@}
 551
 552     //@{
 553     /**
 554         Triggers a refresh for just the area shared between the given row and
 555         column of the window if it is visible.
 556     */
 557     virtual void RefreshRowColumn(size_t row, size_t column);
 558     virtual void RefreshRowColumn(const wxPosition& pos);
 559     //@}
 560
 561     //@{
 562     /**
 563         Triggers a refresh for the visible area shared between all given rows
 564         and columns (inclusive) of the window. If the target window for both
 565         orientations is the same, the rectangle of cells is refreshed; if the
 566         target windows differ, the entire client size opposite the orientation
 567         direction is refreshed between the specified limits.
 568     */
 569     virtual void RefreshRowsColumns(size_t fromRow, size_t toRow,
 570                                     size_t fromColumn, size_t toColumn);
 571     virtual void RefreshRowsColumns(const wxPosition& from,
 572                                     const wxPosition& to);
 573     //@}
 574
 575     //@{
 576     /**
 577         Scroll to the specified row and column. It will become the first
 578         visible row and column in the window. Returns @true if we scrolled the
 579         window, @false if nothing was done.
 580     */
 581     bool ScrollToRowColumn(size_t row, size_t column);
 582     bool ScrollToRowColumn(const wxPosition& pos);
 583     //@}
 584
 585     /**
 586         Set the number of rows and columns the target window will contain. The
 587         derived class must provide the sizes for all rows and columns with
 588         indices up to the ones given here in it's OnGetRowHeight() and
 589         OnGetColumnWidth() implementations, respectively.
 590
 591         @see GetRowColumnCount()
 592     */
 593     void SetRowColumnCount(size_t rowCount, size_t columnCount);
 594
 595     //@{
 596     /**
 597         Returns the virtual scroll unit under the device unit given accounting
 598         for scroll position or @c wxNOT_FOUND (for the row, column, or possibly
 599         both values) if none.
 600     */
 601     wxPosition VirtualHitTest(wxCoord x, wxCoord y) const;
 602     wxPosition VirtualHitTest(const wxPoint& pos) const;
 603     //@}
 604 };
 605
 606
 607
 608 /**
 609     @class wxVScrolledWindow
 610
 611     In the name of this class, "V" may stand for "variable" because it can be
 612     used for scrolling rows of variable heights; "virtual", because it is not
 613     necessary to know the heights of all rows in advance -- only those which
 614     are shown on the screen need to be measured; or even "vertical", because
 615     this class only supports scrolling vertically.
 616
 617     In any case, this is a generalization of wxScrolled which can be only used
 618     when all rows have the same heights. It lacks some other wxScrolled
 619     features however, notably it can't scroll specific pixel sizes of the
 620     window or its exact client area size.
 621
 622     To use this class, you need to derive from it and implement the
 623     OnGetRowHeight() pure virtual method. You also must call SetRowCount() to
 624     let the base class know how many rows it should display, but from that
 625     moment on the scrolling is handled entirely by wxVScrolledWindow. You only
 626     need to draw the visible part of contents in your @c OnPaint() method as
 627     usual. You should use GetVisibleRowsBegin() and GetVisibleRowsEnd() to
 628     select the lines to display. Note that the device context origin is not
 629     shifted so the first visible row always appears at the point (0, 0) in
 630     physical as well as logical coordinates.
 631
 632     @section vscrolledwindow_compat wxWidgets 2.8 Compatibility Functions
 633
 634     The following functions provide backwards compatibility for applications
 635     originally built using wxVScrolledWindow in 2.6 or 2.8. Originally,
 636     wxVScrolledWindow referred to scrolling "lines". We now use "units" in
 637     wxVarScrollHelperBase to avoid implying any orientation (since the
 638     functions are used for both horizontal and vertical scrolling in derived
 639     classes). And in the new wxVScrolledWindow and wxHScrolledWindow classes,
 640     we refer to them as "rows" and "columns", respectively. This is to help
 641     clear some confusion in not only those classes, but also in
 642     wxHVScrolledWindow where functions are inherited from both.
 643
 644     You are encouraged to update any existing code using these function to use
 645     the new replacements mentioned below, and avoid using these functions for
 646     any new code as they are deprecated.
 647
 648     @beginTable
 649     @row2col{ <tt>size_t %GetFirstVisibleLine() const</tt>,
 650         Deprecated for GetVisibleRowsBegin(). }
 651     @row2col{ <tt>size_t %GetLastVisibleLine() const</tt>,
 652         Deprecated for GetVisibleRowsEnd(). This function originally had a
 653         slight design flaw in that it was possible to return
 654         <tt>(size_t)-1</tt> (ie: a large positive number) if the scroll
 655         position was 0 and the first line wasn't completely visible. }
 656     @row2col{ <tt>size_t %GetLineCount() const</tt>,
 657         Deprecated for GetRowCount(). }
 658     @row2col{ <tt>int %HitTest(wxCoord x\, wxCoord y) const
 659               @n  int %HitTest(const wxPoint& pt) const</tt>,
 660         Deprecated for VirtualHitTest(). }
 661     @row2col{ <tt>virtual wxCoord %OnGetLineHeight(size_t line) const</tt>,
 662         Deprecated for OnGetRowHeight(). }
 663     @row2col{ <tt>virtual void %OnGetLinesHint(size_t lineMin\, size_t lineMax) const</tt>,
 664         Deprecated for OnGetRowsHeightHint(). }
 665     @row2col{ <tt>virtual void %RefreshLine(size_t line)</tt>,
 666         Deprecated for RefreshRow(). }
 667     @row2col{ <tt>virtual void %RefreshLines(size_t from\, size_t to)</tt>,
 668         Deprecated for RefreshRows(). }
 669     @row2col{ <tt>virtual bool %ScrollLines(int lines)</tt>,
 670         Deprecated for ScrollRows(). }
 671     @row2col{ <tt>virtual bool %ScrollPages(int pages)</tt>,
 672         Deprecated for ScrollRowPages(). }
 673     @row2col{ <tt>bool %ScrollToLine(size_t line)</tt>,
 674         Deprecated for ScrollToRow(). }
 675     @row2col{ <tt>void %SetLineCount(size_t count)</tt>,
 676         Deprecated for SetRowCount(). }
 677     @endTable
 678
 679     @library{wxcore}
 680     @category{miscwnd}
 681
 682     @see wxHScrolledWindow, wxHVScrolledWindow
 683 */
 684 class wxVScrolledWindow : public wxPanel, public wxVarVScrollHelper
 685 {
 686 public:
 687     /**
 688         Default constructor, you must call Create() later.
 689     */
 690     wxVScrolledWindow();
 691     /**
 692         This is the normal constructor, no need to call Create() after using
 693         this constructor.
 694
 695         @note @c wxVSCROLL is always automatically added to the style, there is
 696               no need to specify it explicitly.
 697
 698         @param parent
 699             The parent window, must not be @NULL.
 700         @param id
 701             The identifier of this window, wxID_ANY by default.
 702         @param pos
 703             The initial window position.
 704         @param size
 705             The initial window size.
 706         @param style
 707             The window style. There are no special style bits defined for this
 708             class.
 709         @param name
 710             The name for this window; usually not used.
 711     */
 712     wxVScrolledWindow(wxWindow* parent, wxWindowID id = wxID_ANY,
 713                       const wxPoint& pos = wxDefaultPosition,
 714                       const wxSize& size = wxDefaultSize, long style = 0,
 715                       const wxString& name = wxPanelNameStr);
 716
 717     /**
 718         Same as the non-default constuctor, but returns a status code: @true if
 719         ok, @false if the window couldn't be created.
 720
 721         Just as with the constructor, the @c wxVSCROLL style is always used,
 722         there is no need to specify it explicitly.
 723     */
 724     bool Create(wxWindow* parent, wxWindowID id = wxID_ANY,
 725                 const wxPoint& pos = wxDefaultPosition,
 726                 const wxSize& size = wxDefaultSize, long style = 0,
 727                 const wxString& name = wxPanelNameStr);
 728 };
 729
 730
 731
 732 /**
 733     @class wxHScrolledWindow
 734
 735     In the name of this class, "H" stands for "horizontal" because it can be
 736     used for scrolling columns of variable widths. It is not necessary to know
 737     the widths of all columns in advance -- only those which are shown on the
 738     screen need to be measured.
 739
 740     In any case, this is a generalization of wxScrolled which can be only used
 741     when all columns have the same widths. It lacks some other wxScrolled
 742     features however, notably it can't scroll specific pixel sizes of the
 743     window or its exact client area size.
 744
 745     To use this class, you need to derive from it and implement the
 746     OnGetColumnWidth() pure virtual method. You also must call SetColumnCount()
 747     to let the base class know how many columns it should display, but from
 748     that moment on the scrolling is handled entirely by wxHScrolledWindow. You
 749     only need to draw the visible part of contents in your @c OnPaint() method
 750     as usual. You should use GetVisibleColumnsBegin() and
 751     GetVisibleColumnsEnd() to select the lines to display. Note that the device
 752     context origin is not shifted so the first visible column always appears at
 753     the point (0, 0) in physical as well as logical coordinates.
 754
 755     @library{wxcore}
 756     @category{miscwnd}
 757
 758     @see wxHVScrolledWindow, wxVScrolledWindow
 759 */
 760 class wxHScrolledWindow : public wxPanel, public wxVarHScrollHelper
 761 {
 762 public:
 763     /**
 764         Default constructor, you must call Create() later.
 765     */
 766     wxHScrolledWindow();
 767     /**
 768         This is the normal constructor, no need to call Create() after using
 769         this constructor.
 770
 771         @note @c wxHSCROLL is always automatically added to the style, there is
 772               no need to specify it explicitly.
 773
 774         @param parent
 775             The parent window, must not be @NULL.
 776         @param id
 777             The identifier of this window, wxID_ANY by default.
 778         @param pos
 779             The initial window position.
 780         @param size
 781             The initial window size.
 782         @param style
 783             The window style. There are no special style bits defined for this
 784             class.
 785         @param name
 786             The name for this window; usually not used.
 787     */
 788     wxHScrolledWindow(wxWindow* parent, wxWindowID id = wxID_ANY,
 789                       const wxPoint& pos = wxDefaultPosition,
 790                       const wxSize& size = wxDefaultSize, long style = 0,
 791                       const wxString& name = wxPanelNameStr);
 792
 793     /**
 794         Same as the non-default constuctor, but returns a status code: @true if
 795         ok, @false if the window couldn't be created.
 796
 797         Just as with the constructor, the @c wxHSCROLL style is always used,
 798         there is no need to specify it explicitly.
 799     */
 800     bool Create(wxWindow* parent, wxWindowID id = wxID_ANY,
 801                 const wxPoint& pos = wxDefaultPosition,
 802                 const wxSize& size = wxDefaultSize, long style = 0,
 803                 const wxString& name = wxPanelNameStr);
 804 };
 805
 806
 807
 808 /**
 809     @class wxHVScrolledWindow
 810
 811     This window inherits all functionality of both vertical and horizontal,
 812     variable scrolled windows. It automatically handles everything needed to
 813     scroll both axis simultaneously with both variable row heights and variable
 814     column widths.
 815
 816     In any case, this is a generalization of wxScrolled which can be only used
 817     when all rows and columns are the same size. It lacks some other wxScrolled
 818     features however, notably it can't scroll specific pixel sizes of the
 819     window or its exact client area size.
 820
 821     To use this class, you must derive from it and implement both the
 822     OnGetRowHeight() and OnGetColumnWidth() pure virtual methods to let the
 823     base class know how many rows and columns it should display. You also need
 824     to set the total rows and columns the window contains, but from that moment
 825     on the scrolling is handled entirely by wxHVScrolledWindow. You only need
 826     to draw the visible part of contents in your @c OnPaint() method as usual.
 827     You should use GetVisibleBegin() and GetVisibleEnd() to select the lines to
 828     display. Note that the device context origin is not shifted so the first
 829     visible row and column always appear at the point (0, 0) in physical as
 830     well as logical coordinates.
 831
 832     @library{wxcore}
 833     @category{miscwnd}
 834
 835     @see wxHScrolledWindow, wxVScrolledWindow
 836 */
 837 class wxHVScrolledWindow : public wxPanel, public wxVarHVScrollHelper
 838 {
 839 public:
 840     /**
 841         Default constructor, you must call Create() later.
 842     */
 843     wxHVScrolledWindow();
 844     /**
 845         This is the normal constructor, no need to call Create() after using
 846         this constructor.
 847
 848         @note @c wxHSCROLL and @c wxVSCROLL are always automatically added to
 849               the style, there is no need to specify it explicitly.
 850
 851         @param parent
 852             The parent window, must not be @NULL.
 853         @param id
 854             The identifier of this window, wxID_ANY by default.
 855         @param pos
 856             The initial window position.
 857         @param size
 858             The initial window size.
 859         @param style
 860             The window style. There are no special style bits defined for this
 861             class.
 862         @param name
 863             The name for this window; usually not used.
 864     */
 865     wxHVScrolledWindow(wxWindow* parent, wxWindowID id = wxID_ANY,
 866                        const wxPoint& pos = wxDefaultPosition,
 867                        const wxSize& size = wxDefaultSize, long style = 0,
 868                        const wxString& name = wxPanelNameStr);
 869
 870     /**
 871         Same as the non-default constuctor, but returns a status code: @true if
 872         ok, @false if the window couldn't be created.
 873
 874         Just as with the constructor, the @c wxHSCROLL and @c wxVSCROLL styles
 875         are always used, there is no need to specify them explicitly.
 876     */
 877     bool Create(wxWindow* parent, wxWindowID id = wxID_ANY,
 878                 const wxPoint& pos = wxDefaultPosition,
 879                 const wxSize& size = wxDefaultSize, long style = 0,
 880                 const wxString& name = wxPanelNameStr);
 881 };
 882