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         wxDECLARE_EVENT_TABLE();
 258     };
 259
 260     wxBEGIN_EVENT_TABLE(wxListViewComboPopup, wxListView)
 261         EVT_MOTION(wxListViewComboPopup::OnMouseMove)
 262         EVT_LEFT_UP(wxListViewComboPopup::OnMouseClick)
 263     wxEND_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_COMBOBOX_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_COMBOBOX_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 current hint string.
 453
 454         See SetHint() for more information about hints.
 455
 456         @since 2.9.1
 457     */
 458     virtual wxString GetHint() const;
 459
 460     /**
 461         Returns the insertion point for the combo control's text field.
 462
 463         @note Under Windows, this function always returns 0 if the combo
 464               control doesn't have the focus.
 465     */
 466     virtual long GetInsertionPoint() const;
 467
 468     /**
 469         Returns the last position in the combo control text field.
 470     */
 471     virtual long GetLastPosition() const;
 472
 473     /**
 474         Returns the margins used by the control. The @c x field of the returned
 475         point is the horizontal margin and the @c y field is the vertical one.
 476
 477         @remarks If given margin cannot be accurately determined, its value
 478                 will be set to -1.
 479
 480         @see SetMargins()
 481
 482         @since 2.9.1
 483     */
 484     wxPoint GetMargins() const;
 485
 486     /**
 487         Returns current popup interface that has been set with
 488         SetPopupControl().
 489     */
 490     wxComboPopup* GetPopupControl();
 491
 492     /**
 493         Returns popup window containing the popup control.
 494     */
 495     wxWindow* GetPopupWindow() const;
 496
 497     /**
 498         Get the text control which is part of the combo control.
 499     */
 500     wxTextCtrl* GetTextCtrl() const;
 501
 502     /**
 503         Returns actual indentation in pixels.
 504
 505         @deprecated Use GetMargins() instead.
 506     */
 507     wxCoord GetTextIndent() const;
 508
 509     /**
 510         Returns area covered by the text field (includes everything except
 511         borders and the dropdown button).
 512     */
 513     const wxRect& GetTextRect() const;
 514
 515     /**
 516         Returns text representation of the current value. For writable combo
 517         control it always returns the value in the text field.
 518     */
 519     virtual wxString GetValue() const;
 520
 521     /**
 522         Dismisses the popup window.
 523
 524         @param generateEvent
 525             Set this to @true in order to generate
 526             wxEVT_COMMAND_COMBOBOX_CLOSEUP event.
 527     */
 528     virtual void HidePopup(bool generateEvent=false);
 529
 530     /**
 531         Returns @true if the popup is currently shown
 532     */
 533     bool IsPopupShown() const;
 534
 535     /**
 536         Returns @true if the popup window is in the given state. Possible
 537         values are:
 538
 539         @beginTable
 540         @row2col{wxComboCtrl::Hidden,    Popup window is hidden.}
 541         @row2col{wxComboCtrl::Animating, Popup window is being shown, but the
 542                                          popup animation has not yet finished.}
 543         @row2col{wxComboCtrl::Visible,   Popup window is fully visible.}
 544         @endTable
 545     */
 546     bool IsPopupWindowState(int state) const;
 547
 548     /**
 549         Implement in a derived class to define what happens on dropdown button
 550         click. Default action is to show the popup.
 551
 552         @note If you implement this to do something else than show the popup,
 553               you must then also implement DoSetPopupControl() to always return
 554               @NULL.
 555     */
 556     virtual void OnButtonClick();
 557
 558     /**
 559         Pastes text from the clipboard to the text field.
 560     */
 561     virtual void Paste();
 562
 563     /**
 564         Removes the text between the two positions in the combo control text
 565         field.
 566
 567         @param from
 568             The first position.
 569         @param to
 570             The last position.
 571     */
 572     virtual void Remove(long from, long to);
 573
 574     /**
 575         Replaces the text between two positions with the given text, in the
 576         combo control text field.
 577
 578         @param from
 579             The first position.
 580         @param to
 581             The second position.
 582         @param text
 583             The text to insert.
 584     */
 585     virtual void Replace(long from, long to, const wxString& text);
 586
 587     /**
 588         Sets custom dropdown button graphics.
 589
 590         @param bmpNormal
 591             Default button image.
 592         @param pushButtonBg
 593             If @true, blank push button background is painted below the image.
 594         @param bmpPressed
 595             Depressed button image.
 596         @param bmpHover
 597             Button image when mouse hovers above it. This should be ignored on
 598             platforms and themes that do not generally draw different kind of
 599             button on mouse hover.
 600         @param bmpDisabled
 601             Disabled button image.
 602     */
 603     void SetButtonBitmaps(const wxBitmap& bmpNormal,
 604                           bool pushButtonBg = false,
 605                           const wxBitmap& bmpPressed = wxNullBitmap,
 606                           const wxBitmap& bmpHover = wxNullBitmap,
 607                           const wxBitmap& bmpDisabled = wxNullBitmap);
 608
 609     /**
 610         Sets size and position of dropdown button.
 611
 612         @param width
 613             Button width. Value = 0 specifies default.
 614         @param height
 615             Button height. Value = 0 specifies default.
 616         @param side
 617             Indicates which side the button will be placed. Value can be wxLEFT
 618             or wxRIGHT.
 619         @param spacingX
 620             Horizontal spacing around the button. Default is 0.
 621     */
 622     void SetButtonPosition(int width = -1, int height = -1,
 623                            int side = wxRIGHT, int spacingX = 0);
 624
 625     /**
 626         Set width, in pixels, of custom painted area in control without
 627         @c wxCB_READONLY style. In read-only wxOwnerDrawnComboBox, this is used
 628         to indicate area that is not covered by the focus rectangle.
 629     */
 630     void SetCustomPaintWidth(int width);
 631
 632     /**
 633         Sets a hint shown in an empty unfocused combo control.
 634
 635         Notice that hints are known as <em>cue banners</em> under MSW or
 636         <em>placeholder strings</em> under OS X.
 637
 638         @see wxTextEntry::SetHint()
 639
 640         @since 2.9.1
 641     */
 642     virtual void SetHint(const wxString& hint);
 643
 644     /**
 645         Sets the insertion point in the text field.
 646
 647         @param pos
 648             The new insertion point.
 649     */
 650     virtual void SetInsertionPoint(long pos);
 651
 652     /**
 653         Sets the insertion point at the end of the combo control text field.
 654     */
 655     virtual void SetInsertionPointEnd();
 656
 657     //@{
 658     /**
 659         Attempts to set the control margins. When margins are given as wxPoint,
 660         x indicates the left and y the top margin. Use -1 to indicate that
 661         an existing value should be used.
 662
 663         @return
 664             @true if setting of all requested margins was successful.
 665
 666         @since 2.9.1
 667     */
 668     bool SetMargins(const wxPoint& pt);
 669     bool SetMargins(wxCoord left, wxCoord top = -1);
 670     //@}
 671
 672     /**
 673         Set side of the control to which the popup will align itself. Valid
 674         values are @c wxLEFT, @c wxRIGHT and 0. The default value 0 means that
 675         the most appropriate side is used (which, currently, is always
 676         @c wxLEFT).
 677     */
 678     void SetPopupAnchor(int anchorSide);
 679
 680     /**
 681         Set popup interface class derived from wxComboPopup. This method should
 682         be called as soon as possible after the control has been created,
 683         unless OnButtonClick() has been overridden.
 684     */
 685     void SetPopupControl(wxComboPopup* popup);
 686
 687     /**
 688         Extends popup size horizontally, relative to the edges of the combo
 689         control.
 690
 691         @param extLeft
 692             How many pixel to extend beyond the left edge of the control.
 693             Default is 0.
 694         @param extRight
 695             How many pixel to extend beyond the right edge of the control.
 696             Default is 0.
 697
 698         @remarks Popup minimum width may override arguments. It is up to the
 699                  popup to fully take this into account.
 700     */
 701     void SetPopupExtents(int extLeft, int extRight);
 702
 703     /**
 704         Sets preferred maximum height of the popup.
 705
 706         @remarks Value -1 indicates the default.
 707     */
 708     void SetPopupMaxHeight(int height);
 709
 710     /**
 711         Sets minimum width of the popup. If wider than combo control, it will
 712         extend to the left.
 713
 714         @remarks Value -1 indicates the default. Also, popup implementation may
 715                  choose to ignore this.
 716     */
 717     void SetPopupMinWidth(int width);
 718
 719     /**
 720         Selects the text between the two positions, in the combo control text
 721         field.
 722
 723         @param from
 724             The first position.
 725         @param to
 726             The second position.
 727     */
 728     virtual void SetSelection(long from, long to);
 729
 730     /**
 731         Sets the text for the text field without affecting the popup. Thus,
 732         unlike SetValue(), it works equally well with combo control using
 733         @c wxCB_READONLY style.
 734     */
 735     void SetText(const wxString& value);
 736
 737     /**
 738         Set a custom window style for the embedded wxTextCtrl. Usually you
 739         will need to use this during two-step creation, just before Create().
 740         For example:
 741
 742         @code
 743             wxComboCtrl* comboCtrl = new wxComboCtrl();
 744
 745             // Let's make the text right-aligned
 746             comboCtrl->SetTextCtrlStyle(wxTE_RIGHT);
 747
 748             comboCtrl->Create(parent, wxID_ANY, wxEmptyString);
 749         @endcode
 750     */
 751     void SetTextCtrlStyle( int style );
 752
 753     /**
 754         This will set the space in pixels between left edge of the control and
 755         the text, regardless whether control is read-only or not. Value -1 can
 756         be given to indicate platform default.
 757
 758         @deprecated Use SetMargins() instead.
 759     */
 760     void SetTextIndent(int indent);
 761
 762     /**
 763         Sets the text for the combo control text field.
 764
 765         @note For a combo control with @c wxCB_READONLY style the string must
 766               be accepted by the popup (for instance, exist in the dropdown
 767               list), otherwise the call to SetValue() is ignored.
 768     */
 769     virtual void SetValue(const wxString& value);
 770
 771     /**
 772         Same as SetValue(), but also sends wxCommandEvent of type
 773         wxEVT_COMMAND_TEXT_UPDATED if @a withEvent is @true.
 774     */
 775     void SetValueWithEvent(const wxString& value, bool withEvent = true);
 776
 777     /**
 778         Show the popup.
 779     */
 780     virtual void ShowPopup();
 781
 782     /**
 783         Undoes the last edit in the text field. Windows only.
 784     */
 785     virtual void Undo();
 786
 787     /**
 788         Enable or disable usage of an alternative popup window, which
 789         guarantees ability to focus the popup control, and allows common native
 790         controls to function normally. This alternative popup window is usually
 791         a wxDialog, and as such, when it is shown, its parent top-level window
 792         will appear as if the focus has been lost from it.
 793     */
 794     void UseAltPopupWindow(bool enable = true);
 795
 796 protected:
 797
 798     /**
 799         This member function is not normally called in application code.
 800         Instead, it can be implemented in a derived class to create a custom
 801         popup animation.
 802
 803         The parameters are the same as those for DoShowPopup().
 804
 805         @return @true if animation finishes before the function returns,
 806                 @false otherwise. In the latter case you need to manually call
 807                 DoShowPopup() after the animation ends.
 808     */
 809     virtual bool AnimateShow(const wxRect& rect, int flags);
 810
 811     /**
 812         This member function is not normally called in application code.
 813         Instead, it can be implemented in a derived class to return default
 814         wxComboPopup, incase @a popup is @NULL.
 815
 816         @note If you have implemented OnButtonClick() to do something else than
 817               show the popup, then DoSetPopupControl() must always set @a popup
 818               to @NULL.
 819     */
 820     virtual void DoSetPopupControl(wxComboPopup* popup);
 821
 822     /**
 823         This member function is not normally called in application code.
 824         Instead, it must be called in a derived class to make sure popup is
 825         properly shown after a popup animation has finished (but only if
 826         AnimateShow() did not finish the animation within its function scope).
 827
 828         @param rect
 829             Position to show the popup window at, in screen coordinates.
 830         @param flags
 831             Combination of any of the following:
 832             @beginTable
 833             @row2col{wxComboCtrl::ShowAbove,
 834                      Popup is shown above the control instead of below.}
 835             @row2col{wxComboCtrl::CanDeferShow,
 836                      Showing the popup can be deferred to happen sometime after
 837                      ShowPopup() has finished. In this case, AnimateShow() must
 838                      return false.}
 839             @endTable
 840     */
 841     virtual void DoShowPopup(const wxRect& rect, int flags);
 842 };
 843