interface/wx/combobox.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        combobox.h
   3 // Purpose:     interface of wxComboBox
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows license
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /**
  10     @class wxComboBox
  11
  12     A combobox is like a combination of an edit control and a listbox. It can
  13     be displayed as static list with editable or read-only text field; or a
  14     drop-down list with text field; or a drop-down list without a text field.
  15
  16     A combobox permits a single selection only. Combobox items are numbered
  17     from zero.
  18
  19     If you need a customized combobox, have a look at wxComboCtrl,
  20     wxOwnerDrawnComboBox, wxComboPopup and the ready-to-use wxBitmapComboBox.
  21
  22     @beginStyleTable
  23     @style{wxCB_SIMPLE}
  24            Creates a combobox with a permanently displayed list. Windows only.
  25     @style{wxCB_DROPDOWN}
  26            Creates a combobox with a drop-down list.
  27     @style{wxCB_READONLY}
  28            Same as wxCB_DROPDOWN but only the strings specified as the combobox
  29            choices can be selected, it is impossible to select (even from a
  30            program) a string which is not in the choices list.
  31     @style{wxCB_SORT}
  32            Sorts the entries in the list alphabetically.
  33     @style{wxTE_PROCESS_ENTER}
  34            The control will generate the event wxEVT_COMMAND_TEXT_ENTER
  35            (otherwise pressing Enter key is either processed internally by the
  36            control or used for navigation between dialog controls). Windows
  37            only.
  38     @endStyleTable
  39
  40     @beginEventTable{wxCommandEvent}
  41     @event{EVT_COMBOBOX(id, func)}
  42            Process a wxEVT_COMMAND_COMBOBOX_SELECTED event, when an item on
  43            the list is selected. Note that calling GetValue() returns the new
  44            value of selection.
  45     @event{EVT_TEXT(id, func)}
  46            Process a wxEVT_COMMAND_TEXT_UPDATED event, when the combobox text
  47            changes.
  48     @event{EVT_TEXT_ENTER(id, func)}
  49            Process a wxEVT_COMMAND_TEXT_ENTER event, when RETURN is pressed in
  50            the combobox (notice that the combobox must have been created with
  51            wxTE_PROCESS_ENTER style to receive this event).
  52     @endEventTable
  53
  54     @library{wxcore}
  55     @category{ctrl}
  56     <!-- @appearance{combobox.png} -->
  57
  58     @see wxListBox, wxTextCtrl, wxChoice, wxCommandEvent
  59 */
  60 class wxComboBox : public wxControl, public wxItemContainer
  61 {
  62 public:
  63     /**
  64         Default constructor.
  65     */
  66     wxComboBox();
  67
  68     //@{
  69     /**
  70         Constructor, creating and showing a combobox.
  71
  72         @param parent
  73             Parent window. Must not be @NULL.
  74         @param id
  75             Window identifier. The value wxID_ANY indicates a default value.
  76         @param value
  77             Initial selection string. An empty string indicates no selection.
  78         @param pos
  79             Window position.
  80         @param size
  81             Window size. If wxDefaultSize is specified then the window is sized
  82             appropriately.
  83         @param n
  84             Number of strings with which to initialise the control.
  85         @param choices
  86             An array of strings with which to initialise the control.
  87         @param style
  88             Window style. See wxComboBox.
  89         @param validator
  90             Window validator.
  91         @param name
  92             Window name.
  93
  94         @beginWxPythonOnly
  95         The wxComboBox constructor in wxPython reduces the @a n and @a choices
  96         arguments are to a single argument, which is a list of strings.
  97         @endWxPythonOnly
  98
  99         @see Create(), wxValidator
 100     */
 101     wxComboBox(wxWindow* parent, wxWindowID id,
 102                const wxString& value = "",
 103                const wxPoint& pos = wxDefaultPosition,
 104                const wxSize& size = wxDefaultSize,
 105                int n = 0,
 106                const wxString choices[] = NULL,
 107                long style = 0,
 108                const wxValidator& validator = wxDefaultValidator,
 109                const wxString& name = "comboBox");
 110     /**
 111         Constructor, creating and showing a combobox.
 112
 113         @param parent
 114             Parent window. Must not be @NULL.
 115         @param id
 116             Window identifier. The value wxID_ANY indicates a default value.
 117         @param value
 118             Initial selection string. An empty string indicates no selection.
 119         @param pos
 120             Window position.
 121         @param size
 122             Window size. If wxDefaultSize is specified then the window is sized
 123             appropriately.
 124         @param choices
 125             An array of strings with which to initialise the control.
 126         @param style
 127             Window style. See wxComboBox.
 128         @param validator
 129             Window validator.
 130         @param name
 131             Window name.
 132
 133         @beginWxPythonOnly
 134         The wxComboBox constructor in wxPython reduces the @a n and @a choices
 135         arguments are to a single argument, which is a list of strings.
 136         @endWxPythonOnly
 137
 138         @see Create(), wxValidator
 139     */
 140     wxComboBox(wxWindow* parent, wxWindowID id,
 141                const wxString& value,
 142                const wxPoint& pos,
 143                const wxSize& size,
 144                const wxArrayString& choices,
 145                long style = 0,
 146                const wxValidator& validator = wxDefaultValidator,
 147                const wxString& name = "comboBox");
 148     //@}
 149
 150     /**
 151         Destructor, destroying the combobox.
 152     */
 153     virtual ~wxComboBox();
 154
 155     //@{
 156     /**
 157         Creates the combobox for two-step construction. Derived classes should
 158         call or replace this function. See wxComboBox() for further details.
 159     */
 160     bool Create(wxWindow* parent, wxWindowID id,
 161                 const wxString& value = "",
 162                 const wxPoint& pos = wxDefaultPosition,
 163                 const wxSize& size = wxDefaultSize,
 164                 int n, const wxString choices[],
 165                 long style = 0,
 166                 const wxValidator& validator = wxDefaultValidator,
 167                 const wxString& name = "comboBox");
 168     bool Create(wxWindow* parent, wxWindowID id,
 169                 const wxString& value,
 170                 const wxPoint& pos,
 171                 const wxSize& size,
 172                 const wxArrayString& choices,
 173                 long style = 0,
 174                 const wxValidator& validator = wxDefaultValidator,
 175                 const wxString& name = "comboBox");
 176     //@}
 177
 178     /**
 179         Returns @true if the combobox is editable and there is a text selection
 180         to copy to the clipboard. Only available on Windows.
 181     */
 182     bool CanCopy() const;
 183
 184     /**
 185         Returns @true if the combobox is editable and there is a text selection
 186         to copy to the clipboard. Only available on Windows.
 187     */
 188     bool CanCut() const;
 189
 190     /**
 191         Returns @true if the combobox is editable and there is text on the
 192         clipboard that can be pasted into the text field. Only available on
 193         Windows.
 194     */
 195     bool CanPaste() const;
 196
 197     /**
 198         Returns @true if the combobox is editable and the last undo can be
 199         redone. Only available on Windows.
 200     */
 201     bool CanRedo() const;
 202
 203     /**
 204         Returns @true if the combobox is editable and the last edit can be
 205         undone. Only available on Windows.
 206     */
 207     bool CanUndo() const;
 208
 209     /**
 210         Copies the selected text to the clipboard.
 211     */
 212     void Copy();
 213
 214     /**
 215         Copies the selected text to the clipboard and removes the selection.
 216     */
 217     void Cut();
 218
 219     /**
 220         This function does the same things as wxChoice::GetCurrentSelection()
 221         and returns the item currently selected in the dropdown list if it's
 222         open or the same thing as wxControlWithItems::GetSelection() otherwise.
 223     */
 224     virtual int GetCurrentSelection() const;
 225
 226     /**
 227         Returns the insertion point for the combobox's text field.
 228
 229         @note Under wxMSW, this function always returns 0 if the combobox
 230               doesn't have the focus.
 231     */
 232     long GetInsertionPoint() const;
 233
 234     /**
 235         Returns the last position in the combobox text field.
 236     */
 237     virtual wxTextPos GetLastPosition() const;
 238
 239     /**
 240         This is the same as wxTextCtrl::GetSelection() for the text control
 241         which is part of the combobox. Notice that this is a different method
 242         from wxControlWithItems::GetSelection().
 243
 244         Currently this method is only implemented in wxMSW and wxGTK.
 245     */
 246     virtual void GetSelection(long* from, long* to) const;
 247
 248     /**
 249         Returns the current value in the combobox text field.
 250     */
 251     wxString GetValue() const;
 252
 253     /**
 254         Pastes text from the clipboard to the text field.
 255     */
 256     void Paste();
 257
 258     /**
 259         Redoes the last undo in the text field. Windows only.
 260     */
 261     void Redo();
 262
 263     /**
 264         Removes the text between the two positions in the combobox text field.
 265
 266         @param from
 267             The first position.
 268         @param to
 269             The last position.
 270     */
 271     void Remove(long from, long to);
 272
 273     /**
 274         Replaces the text between two positions with the given text, in the
 275         combobox text field.
 276
 277         @param from
 278             The first position.
 279         @param to
 280             The second position.
 281         @param text
 282             The text to insert.
 283     */
 284     void Replace(long from, long to, const wxString& text);
 285
 286     /**
 287         Sets the insertion point in the combobox text field.
 288
 289         @param pos
 290             The new insertion point.
 291     */
 292     void SetInsertionPoint(long pos);
 293
 294     /**
 295         Sets the insertion point at the end of the combobox text field.
 296     */
 297     void SetInsertionPointEnd();
 298
 299     /**
 300         Selects the text between the two positions, in the combobox text field.
 301
 302         @param from
 303             The first position.
 304         @param to
 305             The second position.
 306
 307         @beginWxPythonOnly
 308         This method is called SetMark() in wxPython, "SetSelection" is kept for
 309         wxControlWithItems::SetSelection().
 310         @endWxPythonOnly
 311     */
 312     virtual void SetSelection(long from, long to);
 313
 314     /**
 315         Sets the text for the combobox text field.
 316
 317         @note For a combobox with @c wxCB_READONLY style the string must be in
 318               the combobox choices list, otherwise the call to SetValue() is
 319               ignored.
 320
 321         @param text
 322             The text to set.
 323     */
 324     void SetValue(const wxString& text);
 325
 326     /**
 327         Undoes the last edit in the text field. Windows only.
 328     */
 329     void Undo();
 330 };
 331