interface/wx/combo.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        combo.h
   3 // Purpose:     interface of wxComboCtrl and wxComboPopup
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows license
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /**
  10     @class wxComboPopup
  11
  12     In order to use a custom popup with wxComboCtrl, an interface class must be
  13     derived from wxComboPopup.
  14
  15     For more information on how to use it, see @ref comboctrl_custompopup.
  16
  17     @library{wxcore}
  18     @category{ctrl}
  19
  20     @see wxComboCtrl
  21 */
  22 class wxComboPopup
  23 {
  24 public:
  25     /**
  26         Default constructor. It is recommended that internal variables are
  27         prepared in Init() instead (because m_combo is not valid in
  28         constructor).
  29     */
  30     wxComboPopup();
  31
  32     /**
  33         The derived class must implement this to create the popup control.
  34
  35         @return @true if the call succeeded, @false otherwise.
  36     */
  37     virtual bool Create(wxWindow* parent) = 0;
  38
  39     /**
  40         Utility function that hides the popup.
  41     */
  42     void Dismiss();
  43
  44     /**
  45         The derived class may implement this to return adjusted size for the
  46         popup control, according to the variables given.
  47
  48         @param minWidth
  49             Preferred minimum width.
  50         @param prefHeight
  51             Preferred height. May be -1 to indicate no preference.
  52         @param maxHeight
  53             Max height for window, as limited by screen size.
  54
  55         @remarks This function is called each time popup is about to be shown.
  56     */
  57     virtual wxSize GetAdjustedSize(int minWidth, int prefHeight, int maxHeight);
  58
  59     /**
  60         Returns pointer to the associated parent wxComboCtrl.
  61     */
  62     wxComboCtrl* GetComboCtrl() const;
  63
  64     /**
  65         The derived class must implement this to return pointer to the
  66         associated control created in Create().
  67     */
  68     virtual wxWindow* GetControl() = 0;
  69
  70     /**
  71         The derived class must implement this to return string representation
  72         of the value.
  73     */
  74     virtual wxString GetStringValue() const = 0;
  75
  76     /**
  77         The derived class must implement this to initialize its internal
  78         variables. This method is called immediately after construction
  79         finishes. m_combo member variable has been initialized before the call.
  80     */
  81     virtual void Init();
  82
  83     /**
  84         Utility method that returns @true if Create has been called.
  85
  86         Useful in conjunction with LazyCreate().
  87     */
  88     bool IsCreated() const;
  89
  90     /**
  91         The derived class may implement this to return @true if it wants to
  92         delay call to Create() until the popup is shown for the first time. It
  93         is more efficient, but on the other hand it is often more convenient to
  94         have the control created immediately.
  95
  96         @remarks Base implementation returns @false.
  97     */
  98     virtual bool LazyCreate();
  99
 100     /**
 101         The derived class may implement this to do something when the parent
 102         wxComboCtrl gets double-clicked.
 103     */
 104     virtual void OnComboDoubleClick();
 105
 106     /**
 107         The derived class may implement this to receive key events from the
 108         parent wxComboCtrl.
 109
 110         Events not handled should be skipped, as usual.
 111     */
 112     virtual void OnComboKeyEvent(wxKeyEvent& event);
 113
 114     /**
 115         The derived class may implement this to do special processing when
 116         popup is hidden.
 117     */
 118     virtual void OnDismiss();
 119
 120     /**
 121         The derived class may implement this to do special processing when
 122         popup is shown.
 123     */
 124     virtual void OnPopup();
 125
 126     /**
 127         The derived class may implement this to paint the parent wxComboCtrl.
 128
 129         Default implementation draws value as string.
 130     */
 131     virtual void PaintComboControl(wxDC& dc, const wxRect& rect);
 132
 133     /**
 134         The derived class must implement this to receive string value changes
 135         from wxComboCtrl.
 136     */
 137     virtual void SetStringValue(const wxString& value);
 138
 139 protected:
 140     /**
 141         Parent wxComboCtrl. This member variable is prepared automatically
 142         before Init() is called.
 143     */
 144     wxComboCtrl*    m_combo;
 145 };
 146
 147
 148
 149 /**
 150     Features enabled for wxComboCtrl.
 151
 152     @see wxComboCtrl::GetFeatures()
 153 */
 154 struct wxComboCtrlFeatures
 155 {
 156     enum
 157     {
 158         MovableButton   = 0x0001, ///< Button can be on either side of control.
 159         BitmapButton    = 0x0002, ///< Button may be replaced with bitmap.
 160         ButtonSpacing   = 0x0004, ///< Button can have spacing from the edge
 161                                   ///< of the control.
 162         TextIndent      = 0x0008, ///< wxComboCtrl::SetMargins() can be used.
 163         PaintControl    = 0x0010, ///< Combo control itself can be custom painted.
 164         PaintWritable   = 0x0020, ///< A variable-width area in front of writable
 165                                   ///< combo control's textctrl can be custom
 166                                   ///< painted.
 167         Borderless      = 0x0040, ///< wxNO_BORDER window style works.
 168
 169         All             = MovableButton | BitmapButton | ButtonSpacing |
 170                           TextIndent | PaintControl | PaintWritable |
 171                           Borderless ///< All features.
 172     };
 173 };
 174
 175
 176 /**
 177     @class wxComboCtrl
 178
 179     A combo control is a generic combobox that allows totally custom popup. In
 180     addition it has other customization features. For instance, position and
 181     size of the dropdown button can be changed.
 182
 183     @section comboctrl_custompopup Setting Custom Popup for wxComboCtrl
 184
 185     wxComboCtrl needs to be told somehow which control to use and this is done
 186     by SetPopupControl(). However, we need something more than just a wxControl
 187     in this method as, for example, we need to call
 188     SetStringValue("initial text value") and wxControl doesn't have such
 189     method. So we also need a wxComboPopup which is an interface which must be
 190     implemented by a control to be usable as a popup.
 191
 192     We couldn't derive wxComboPopup from wxControl as this would make it
 193     impossible to have a class deriving from a wxWidgets control and from it,
 194     so instead it is just a mix-in.
 195
 196     Here's a minimal sample of wxListView popup:
 197
 198     @code
 199     #include <wx/combo.h>
 200     #include <wx/listctrl.h>
 201
 202     class wxListViewComboPopup : public wxListView, public wxComboPopup
 203     {
 204     public:
 205         // Initialize member variables
 206         virtual void Init()
 207         {
 208             m_value = -1;
 209         }
 210
 211         // Create popup control
 212         virtual bool Create(wxWindow* parent)
 213         {
 214             return wxListView::Create(parent,1,wxPoint(0,0),wxDefaultSize);
 215         }
 216
 217         // Return pointer to the created control
 218         virtual wxWindow *GetControl() { return this; }
 219
 220         // Translate string into a list selection
 221         virtual void SetStringValue(const wxString& s)
 222         {
 223             int n = wxListView::FindItem(-1,s);
 224             if ( n >= 0 && n < wxListView::GetItemCount() )
 225                 wxListView::Select(n);
 226         }
 227
 228         // Get list selection as a string
 229         virtual wxString GetStringValue() const
 230         {
 231             if ( m_value >= 0 )
 232             return wxListView::GetItemText(m_value);
 233             return wxEmptyString;
 234         }
 235
 236         // Do mouse hot-tracking (which is typical in list popups)
 237         void OnMouseMove(wxMouseEvent& event)
 238         {
 239             // TODO: Move selection to cursor
 240         }
 241
 242         // On mouse left up, set the value and close the popup
 243         void OnMouseClick(wxMouseEvent& WXUNUSED(event))
 244         {
 245             m_value = wxListView::GetFirstSelected();
 246
 247             // TODO: Send event as well
 248
 249             Dismiss();
 250         }
 251
 252     protected:
 253
 254         int m_value; // current item index
 255
 256     private:
 257         DECLARE_EVENT_TABLE()
 258     };
 259
 260     BEGIN_EVENT_TABLE(wxListViewComboPopup, wxListView)
 261         EVT_MOTION(wxListViewComboPopup::OnMouseMove)
 262         EVT_LEFT_UP(wxListViewComboPopup::OnMouseClick)
 263     END_EVENT_TABLE()
 264     @endcode
 265
 266     Here's how you would create and populate it in a dialog constructor:
 267
 268     @code
 269     wxComboCtrl* comboCtrl = new wxComboCtrl(this, wxID_ANY, wxEmptyString);
 270
 271     wxListViewComboPopup* popupCtrl = new wxListViewComboPopup();
 272
 273     // It is important to call SetPopupControl() as soon as possible
 274     comboCtrl->SetPopupControl(popupCtrl);
 275
 276     // Populate using wxListView methods
 277     popupCtrl->InsertItem(popupCtrl->GetItemCount(), "First Item");
 278     popupCtrl->InsertItem(popupCtrl->GetItemCount(), "Second Item");
 279     popupCtrl->InsertItem(popupCtrl->GetItemCount(), "Third Item");
 280     @endcode
 281
 282     @beginStyleTable
 283     @style{wxCB_READONLY}
 284            Text will not be editable.
 285     @style{wxCB_SORT}
 286            Sorts the entries in the list alphabetically.
 287     @style{wxTE_PROCESS_ENTER}
 288            The control will generate the event wxEVT_COMMAND_TEXT_ENTER
 289            (otherwise pressing Enter key is either processed internally by the
 290            control or used for navigation between dialog controls). Windows
 291            only.
 292     @style{wxCC_SPECIAL_DCLICK}
 293            Double-clicking triggers a call to popup's OnComboDoubleClick.
 294            Actual behaviour is defined by a derived class. For instance,
 295            wxOwnerDrawnComboBox will cycle an item. This style only applies if
 296            wxCB_READONLY is used as well.
 297     @style{wxCC_STD_BUTTON}
 298            Drop button will behave more like a standard push button.
 299     @endStyleTable
 300
 301     @beginEventEmissionTable{wxCommandEvent}
 302     @event{EVT_TEXT(id, func)}
 303            Process a wxEVT_COMMAND_TEXT_UPDATED event, when the text changes.
 304     @event{EVT_TEXT_ENTER(id, func)}
 305            Process a wxEVT_COMMAND_TEXT_ENTER event, when RETURN is pressed in
 306            the combo control.
 307     @event{EVT_COMBOX_DROPDOWN(id, func)}
 308            Process a wxEVT_COMMAND_COMBOBOX_DROPDOWN event, which is generated
 309            when the popup window is shown (drops down).
 310     @event{EVT_COMBOX_CLOSEUP(id, func)}
 311            Process a wxEVT_COMMAND_COMBOBOX_CLOSEUP event, which is generated
 312            when the popup window of the combo control disappears (closes up).
 313            You should avoid adding or deleting items in this event.
 314     @endEventTable
 315
 316     @library{wxbase}
 317     @category{ctrl}
 318     @appearance{comboctrl.png}
 319
 320     @see wxComboBox, wxChoice, wxOwnerDrawnComboBox, wxComboPopup,
 321          wxCommandEvent
 322 */
 323 class wxComboCtrl : public wxControl
 324 {
 325 public:
 326     /**
 327         Default constructor.
 328     */
 329     wxComboCtrl();
 330
 331     /**
 332         Constructor, creating and showing a combo control.
 333
 334         @param parent
 335             Parent window. Must not be @NULL.
 336         @param id
 337             Window identifier. The value wxID_ANY indicates a default value.
 338         @param value
 339             Initial selection string. An empty string indicates no selection.
 340         @param pos
 341             Window position.
 342             If ::wxDefaultPosition is specified then a default position is chosen.
 343         @param size
 344             Window size.
 345             If ::wxDefaultSize is specified then the window is sized appropriately.
 346         @param style
 347             Window style. See wxComboCtrl.
 348         @param validator
 349             Window validator.
 350         @param name
 351             Window name.
 352
 353         @see Create(), wxValidator
 354     */
 355     wxComboCtrl(wxWindow* parent, wxWindowID id = wxID_ANY,
 356                 const wxString& value = wxEmptyString,
 357                 const wxPoint& pos = wxDefaultPosition,
 358                 const wxSize& size = wxDefaultSize,
 359                 long style = 0,
 360                 const wxValidator& validator = wxDefaultValidator,
 361                 const wxString& name = wxComboBoxNameStr);
 362
 363     /**
 364         Destructor, destroying the combo control.
 365     */
 366     virtual ~wxComboCtrl();
 367
 368     /**
 369         Copies the selected text to the clipboard.
 370     */
 371     virtual void Copy();
 372
 373     /**
 374         Creates the combo control for two-step construction. Derived classes
 375         should call or replace this function. See wxComboCtrl() for further
 376         details.
 377     */
 378     bool Create(wxWindow* parent, wxWindowID id = wxID_ANY,
 379                 const wxString& value = wxEmptyString,
 380                 const wxPoint& pos = wxDefaultPosition,
 381                 const wxSize& size = wxDefaultSize,
 382                 long style = 0,
 383                 const wxValidator& validator = wxDefaultValidator,
 384                 const wxString& name = wxComboBoxNameStr);
 385
 386     /**
 387         Copies the selected text to the clipboard and removes the selection.
 388     */
 389     virtual void Cut();
 390
 391     /**
 392         Enables or disables popup animation, if any, depending on the value of
 393         the argument.
 394     */
 395     void EnablePopupAnimation(bool enable = true);
 396
 397     /**
 398         Returns disabled button bitmap that has been set with
 399         SetButtonBitmaps().
 400
 401         @return A reference to the disabled state bitmap.
 402     */
 403     const wxBitmap& GetBitmapDisabled() const;
 404
 405     /**
 406         Returns button mouse hover bitmap that has been set with
 407         SetButtonBitmaps().
 408
 409         @return A reference to the mouse hover state bitmap.
 410     */
 411     const wxBitmap& GetBitmapHover() const;
 412
 413     /**
 414         Returns default button bitmap that has been set with
 415         SetButtonBitmaps().
 416
 417         @return A reference to the normal state bitmap.
 418     */
 419     const wxBitmap& GetBitmapNormal() const;
 420
 421     /**
 422         Returns depressed button bitmap that has been set with
 423         SetButtonBitmaps().
 424
 425         @return A reference to the depressed state bitmap.
 426     */
 427     const wxBitmap& GetBitmapPressed() const;
 428
 429     /**
 430         Returns current size of the dropdown button.
 431     */
 432     wxSize GetButtonSize();
 433
 434     /**
 435         Returns custom painted area in control.
 436
 437         @see SetCustomPaintWidth().
 438     */
 439     int GetCustomPaintWidth() const;
 440
 441     /**
 442         Returns features supported by wxComboCtrl. If needed feature is
 443         missing, you need to instead use wxGenericComboCtrl, which however may
 444         lack a native look and feel (but otherwise sports identical API).
 445
 446         @return Value returned is a combination of the flags defined in
 447                 wxComboCtrlFeatures.
 448     */
 449     static int GetFeatures();
 450
 451     /**
 452         Returns the insertion point for the combo control's text field.
 453
 454         @note Under Windows, this function always returns 0 if the combo
 455               control doesn't have the focus.
 456     */
 457     virtual long GetInsertionPoint() const;
 458
 459     /**
 460         Returns the last position in the combo control text field.
 461     */
 462     virtual long GetLastPosition() const;
 463
 464     /**
 465         Returns the margins used by the control. The @c x field of the returned
 466         point is the horizontal margin and the @c y field is the vertical one.
 467
 468         @remarks If given margin cannot be accurately determined, its value
 469                 will be set to -1.
 470
 471         @see SetMargins()
 472
 473         @since 2.9.1
 474     */
 475     wxPoint GetMargins() const;
 476
 477     /**
 478         Returns current popup interface that has been set with
 479         SetPopupControl().
 480     */
 481     wxComboPopup* GetPopupControl();
 482
 483     /**
 484         Returns popup window containing the popup control.
 485     */
 486     wxWindow* GetPopupWindow() const;
 487
 488     /**
 489         Get the text control which is part of the combo control.
 490     */
 491     wxTextCtrl* GetTextCtrl() const;
 492
 493     /**
 494         Returns actual indentation in pixels.
 495
 496         @deprecated Use GetMargins() instead.
 497     */
 498     wxCoord GetTextIndent() const;
 499
 500     /**
 501         Returns area covered by the text field (includes everything except
 502         borders and the dropdown button).
 503     */
 504     const wxRect& GetTextRect() const;
 505
 506     /**
 507         Returns text representation of the current value. For writable combo
 508         control it always returns the value in the text field.
 509     */
 510     virtual wxString GetValue() const;
 511
 512     /**
 513         Dismisses the popup window.
 514
 515         @param generateEvent
 516             Set this to @true in order to generate
 517             wxEVT_COMMAND_COMBOBOX_CLOSEUP event.
 518     */
 519     virtual void HidePopup(bool generateEvent=false);
 520
 521     /**
 522         Returns @true if the popup is currently shown
 523     */
 524     bool IsPopupShown() const;
 525
 526     /**
 527         Returns @true if the popup window is in the given state. Possible
 528         values are:
 529
 530         @beginTable
 531         @row2col{wxComboCtrl::Hidden,    Popup window is hidden.}
 532         @row2col{wxComboCtrl::Animating, Popup window is being shown, but the
 533                                          popup animation has not yet finished.}
 534         @row2col{wxComboCtrl::Visible,   Popup window is fully visible.}
 535         @endTable
 536     */
 537     bool IsPopupWindowState(int state) const;
 538
 539     /**
 540         Implement in a derived class to define what happens on dropdown button
 541         click. Default action is to show the popup.
 542
 543         @note If you implement this to do something else than show the popup,
 544               you must then also implement DoSetPopupControl() to always return
 545               @NULL.
 546     */
 547     virtual void OnButtonClick();
 548
 549     /**
 550         Pastes text from the clipboard to the text field.
 551     */
 552     virtual void Paste();
 553
 554     /**
 555         Removes the text between the two positions in the combo control text
 556         field.
 557
 558         @param from
 559             The first position.
 560         @param to
 561             The last position.
 562     */
 563     virtual void Remove(long from, long to);
 564
 565     /**
 566         Replaces the text between two positions with the given text, in the
 567         combo control text field.
 568
 569         @param from
 570             The first position.
 571         @param to
 572             The second position.
 573         @param text
 574             The text to insert.
 575     */
 576     virtual void Replace(long from, long to, const wxString& text);
 577
 578     /**
 579         Sets custom dropdown button graphics.
 580
 581         @param bmpNormal
 582             Default button image.
 583         @param pushButtonBg
 584             If @true, blank push button background is painted below the image.
 585         @param bmpPressed
 586             Depressed button image.
 587         @param bmpHover
 588             Button image when mouse hovers above it. This should be ignored on
 589             platforms and themes that do not generally draw different kind of
 590             button on mouse hover.
 591         @param bmpDisabled
 592             Disabled button image.
 593     */
 594     void SetButtonBitmaps(const wxBitmap& bmpNormal,
 595                           bool pushButtonBg = false,
 596                           const wxBitmap& bmpPressed = wxNullBitmap,
 597                           const wxBitmap& bmpHover = wxNullBitmap,
 598                           const wxBitmap& bmpDisabled = wxNullBitmap);
 599
 600     /**
 601         Sets size and position of dropdown button.
 602
 603         @param width
 604             Button width. Value = 0 specifies default.
 605         @param height
 606             Button height. Value = 0 specifies default.
 607         @param side
 608             Indicates which side the button will be placed. Value can be wxLEFT
 609             or wxRIGHT.
 610         @param spacingX
 611             Horizontal spacing around the button. Default is 0.
 612     */
 613     void SetButtonPosition(int width = -1, int height = -1,
 614                            int side = wxRIGHT, int spacingX = 0);
 615
 616     /**
 617         Set width, in pixels, of custom painted area in control without
 618         @c wxCB_READONLY style. In read-only wxOwnerDrawnComboBox, this is used
 619         to indicate area that is not covered by the focus rectangle.
 620     */
 621     void SetCustomPaintWidth(int width);
 622
 623     /**
 624         Sets the insertion point in the text field.
 625
 626         @param pos
 627             The new insertion point.
 628     */
 629     virtual void SetInsertionPoint(long pos);
 630
 631     /**
 632         Sets the insertion point at the end of the combo control text field.
 633     */
 634     virtual void SetInsertionPointEnd();
 635
 636     //@{
 637     /**
 638         Attempts to set the control margins. When margins are given as wxPoint,
 639         x indicates the left and y the top margin. Use -1 to indicate that
 640         an existing value should be used.
 641
 642         @return
 643             @true if setting of all requested margins was successful.
 644
 645         @since 2.9.1
 646     */
 647     bool SetMargins(const wxPoint& pt);
 648     bool SetMargins(wxCoord left, wxCoord top = -1);
 649     //@}
 650
 651     /**
 652         Set side of the control to which the popup will align itself. Valid
 653         values are @c wxLEFT, @c wxRIGHT and 0. The default value 0 means that
 654         the most appropriate side is used (which, currently, is always
 655         @c wxLEFT).
 656     */
 657     void SetPopupAnchor(int anchorSide);
 658
 659     /**
 660         Set popup interface class derived from wxComboPopup. This method should
 661         be called as soon as possible after the control has been created,
 662         unless OnButtonClick() has been overridden.
 663     */
 664     void SetPopupControl(wxComboPopup* popup);
 665
 666     /**
 667         Extends popup size horizontally, relative to the edges of the combo
 668         control.
 669
 670         @param extLeft
 671             How many pixel to extend beyond the left edge of the control.
 672             Default is 0.
 673         @param extRight
 674             How many pixel to extend beyond the right edge of the control.
 675             Default is 0.
 676
 677         @remarks Popup minimum width may override arguments. It is up to the
 678                  popup to fully take this into account.
 679     */
 680     void SetPopupExtents(int extLeft, int extRight);
 681
 682     /**
 683         Sets preferred maximum height of the popup.
 684
 685         @remarks Value -1 indicates the default.
 686     */
 687     void SetPopupMaxHeight(int height);
 688
 689     /**
 690         Sets minimum width of the popup. If wider than combo control, it will
 691         extend to the left.
 692
 693         @remarks Value -1 indicates the default. Also, popup implementation may
 694                  choose to ignore this.
 695     */
 696     void SetPopupMinWidth(int width);
 697
 698     /**
 699         Selects the text between the two positions, in the combo control text
 700         field.
 701
 702         @param from
 703             The first position.
 704         @param to
 705             The second position.
 706     */
 707     virtual void SetSelection(long from, long to);
 708
 709     /**
 710         Sets the text for the text field without affecting the popup. Thus,
 711         unlike SetValue(), it works equally well with combo control using
 712         @c wxCB_READONLY style.
 713     */
 714     void SetText(const wxString& value);
 715
 716     /**
 717         This will set the space in pixels between left edge of the control and
 718         the text, regardless whether control is read-only or not. Value -1 can
 719         be given to indicate platform default.
 720
 721         @deprecated Use SetMargins() instead.
 722     */
 723     void SetTextIndent(int indent);
 724
 725     /**
 726         Sets the text for the combo control text field.
 727
 728         @note For a combo control with @c wxCB_READONLY style the string must
 729               be accepted by the popup (for instance, exist in the dropdown
 730               list), otherwise the call to SetValue() is ignored.
 731     */
 732     virtual void SetValue(const wxString& value);
 733
 734     /**
 735         Same as SetValue(), but also sends wxCommandEvent of type
 736         wxEVT_COMMAND_TEXT_UPDATED if @a withEvent is @true.
 737     */
 738     void SetValueWithEvent(const wxString& value, bool withEvent = true);
 739
 740     /**
 741         Show the popup.
 742     */
 743     virtual void ShowPopup();
 744
 745     /**
 746         Undoes the last edit in the text field. Windows only.
 747     */
 748     virtual void Undo();
 749
 750     /**
 751         Enable or disable usage of an alternative popup window, which
 752         guarantees ability to focus the popup control, and allows common native
 753         controls to function normally. This alternative popup window is usually
 754         a wxDialog, and as such, when it is shown, its parent top-level window
 755         will appear as if the focus has been lost from it.
 756     */
 757     void UseAltPopupWindow(bool enable = true);
 758
 759 protected:
 760
 761     /**
 762         This member function is not normally called in application code.
 763         Instead, it can be implemented in a derived class to create a custom
 764         popup animation.
 765
 766         The parameters are the same as those for DoShowPopup().
 767
 768         @return @true if animation finishes before the function returns,
 769                 @false otherwise. In the latter case you need to manually call
 770                 DoShowPopup() after the animation ends.
 771     */
 772     virtual bool AnimateShow(const wxRect& rect, int flags);
 773
 774     /**
 775         This member function is not normally called in application code.
 776         Instead, it can be implemented in a derived class to return default
 777         wxComboPopup, incase @a popup is @NULL.
 778
 779         @note If you have implemented OnButtonClick() to do something else than
 780               show the popup, then DoSetPopupControl() must always set @a popup
 781               to @NULL.
 782     */
 783     virtual void DoSetPopupControl(wxComboPopup* popup);
 784
 785     /**
 786         This member function is not normally called in application code.
 787         Instead, it must be called in a derived class to make sure popup is
 788         properly shown after a popup animation has finished (but only if
 789         AnimateShow() did not finish the animation within its function scope).
 790
 791         @param rect
 792             Position to show the popup window at, in screen coordinates.
 793         @param flags
 794             Combination of any of the following:
 795             @beginTable
 796             @row2col{wxComboCtrl::ShowAbove,
 797                      Popup is shown above the control instead of below.}
 798             @row2col{wxComboCtrl::CanDeferShow,
 799                      Showing the popup can be deferred to happen sometime after
 800                      ShowPopup() has finished. In this case, AnimateShow() must
 801                      return false.}
 802             @endTable
 803     */
 804     virtual void DoShowPopup(const wxRect& rect, int flags);
 805 };
 806