include/wx/generic/treectrl.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        treectrl.h
   3 // Purpose:     wxTreeCtrl class
   4 // Author:      Robert Roebling
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1997,1998 Robert Roebling
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _GENERIC_TREECTRL_H_
  13 #define _GENERIC_TREECTRL_H_
  14
  15 #ifdef __GNUG__
  16     #pragma interface "treectrl.h"
  17 #endif
  18
  19 #include "wx/defs.h"
  20 #include "wx/string.h"
  21 #include "wx/object.h"
  22 #include "wx/event.h"
  23 #include "wx/scrolwin.h"
  24 #include "wx/textctrl.h"
  25
  26 // -----------------------------------------------------------------------------
  27 // forward declaration
  28 // -----------------------------------------------------------------------------
  29
  30 class wxImageList;
  31 class wxGenericTreeItem;
  32
  33 class wxTreeItemData;
  34 typedef int (*wxTreeItemCmpFunc)(wxTreeItemData *item1, wxTreeItemData *item2);
  35
  36 // -----------------------------------------------------------------------------
  37 // wxTreeItemId - unique identifier of a tree element
  38 // -----------------------------------------------------------------------------
  39
  40 class WXDLLEXPORT wxTreeItemId
  41 {
  42 friend class wxTreeCtrl;
  43 friend class wxTreeEvent;
  44 public:
  45     // ctors
  46         // 0 is invalid value for HTREEITEM
  47     wxTreeItemId() { m_pItem = 0; }
  48
  49         // default copy ctor/assignment operator are ok for us
  50
  51     // accessors
  52         // is this a valid tree item?
  53     bool IsOk() const { return m_pItem != 0; }
  54
  55     // deprecated: only for compatibility
  56     wxTreeItemId(long itemId) { m_pItem = (wxGenericTreeItem *)itemId; }
  57     operator long() const { return (long)m_pItem; }
  58
  59 //protected: // not for gcc
  60     // for wxTreeCtrl usage only
  61     wxTreeItemId(wxGenericTreeItem *pItem) { m_pItem = pItem; }
  62
  63     wxGenericTreeItem *m_pItem;
  64 };
  65
  66 // ----------------------------------------------------------------------------
  67 // wxTreeItemData is some (arbitrary) user class associated with some item.
  68 //
  69 // Because the objects of this class are deleted by the tree, they should
  70 // always be allocated on the heap!
  71 // ----------------------------------------------------------------------------
  72 class WXDLLEXPORT wxTreeItemData: public wxClientData
  73 {
  74 friend class wxTreeCtrl;
  75 public:
  76     // creation/destruction
  77     // --------------------
  78         // default ctor
  79     wxTreeItemData() { }
  80
  81         // default copy ctor/assignment operator are ok
  82
  83     // accessor: get the item associated with us
  84     const wxTreeItemId& GetId() const { return m_pItem; }
  85     void SetId(const wxTreeItemId& id) { m_pItem = id; }
  86
  87 protected:
  88     wxTreeItemId m_pItem;
  89 };
  90
  91 // -----------------------------------------------------------------------------
  92 // wxTreeEvent - the event generated by the tree control
  93 // -----------------------------------------------------------------------------
  94 class WXDLLEXPORT wxTreeEvent : public wxNotifyEvent
  95 {
  96 friend class wxTreeCtrl;
  97 public:
  98     wxTreeEvent(wxEventType commandType = wxEVT_NULL, int id = 0);
  99
 100     // accessors
 101         // get the item on which the operation was performed or the newly
 102         // selected item for wxEVT_COMMAND_TREE_SEL_CHANGED/ING events
 103     wxTreeItemId GetItem() const { return m_item; }
 104
 105         // for wxEVT_COMMAND_TREE_SEL_CHANGED/ING events, get the previously
 106         // selected item
 107     wxTreeItemId GetOldItem() const { return m_itemOld; }
 108
 109         // the point where the mouse was when the drag operation started (for
 110         // wxEVT_COMMAND_TREE_BEGIN_(R)DRAG events only)
 111     wxPoint GetPoint() const { return m_pointDrag; }
 112
 113         // keyboard code (for wxEVT_COMMAND_TREE_KEY_DOWN only)
 114     int GetCode() const { return m_code; }
 115
 116     // set return code for wxEVT_COMMAND_TREE_ITEM_{EXPAND|COLLAPS}ING events
 117         // call this to forbid the change in item status
 118     void Veto() { m_code = TRUE; }
 119
 120         // for implementation usage only
 121     bool WasVetoed() const { return m_code; }
 122
 123 private:
 124     // @@ we could save some space by using union here
 125     int           m_code;
 126     wxTreeItemId  m_item,
 127                   m_itemOld;
 128     wxPoint       m_pointDrag;
 129
 130     DECLARE_DYNAMIC_CLASS(wxTreeEvent)
 131 };
 132
 133 typedef void (wxEvtHandler::*wxTreeEventFunction)(wxTreeEvent&);
 134
 135 // ----------------------------------------------------------------------------
 136 // macros for handling tree control events
 137 // ----------------------------------------------------------------------------
 138
 139 // GetItem() returns the item being dragged, GetPoint() the mouse coords
 140 #define EVT_TREE_BEGIN_DRAG(id, fn) { wxEVT_COMMAND_TREE_BEGIN_DRAG, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 141 #define EVT_TREE_BEGIN_RDRAG(id, fn) { wxEVT_COMMAND_TREE_BEGIN_RDRAG, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 142
 143 // GetItem() returns the itme whose label is being edited
 144 #define EVT_TREE_BEGIN_LABEL_EDIT(id, fn) { wxEVT_COMMAND_TREE_BEGIN_LABEL_EDIT, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 145 #define EVT_TREE_END_LABEL_EDIT(id, fn) { wxEVT_COMMAND_TREE_END_LABEL_EDIT, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 146
 147 // provide/update information about GetItem() item
 148 #define EVT_TREE_GET_INFO(id, fn) { wxEVT_COMMAND_TREE_GET_INFO, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 149 #define EVT_TREE_SET_INFO(id, fn) { wxEVT_COMMAND_TREE_SET_INFO, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 150
 151 // GetItem() is the item being expanded/collapsed, the "ING" versions can use
 152 #define EVT_TREE_ITEM_EXPANDED(id, fn) { wxEVT_COMMAND_TREE_ITEM_EXPANDED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 153 #define EVT_TREE_ITEM_EXPANDING(id, fn) { wxEVT_COMMAND_TREE_ITEM_EXPANDING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 154 #define EVT_TREE_ITEM_COLLAPSED(id, fn) { wxEVT_COMMAND_TREE_ITEM_COLLAPSED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 155 #define EVT_TREE_ITEM_COLLAPSING(id, fn) { wxEVT_COMMAND_TREE_ITEM_COLLAPSING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 156
 157 // GetOldItem() is the item which had the selection previously, GetItem() is
 158 // the item which acquires selection
 159 #define EVT_TREE_SEL_CHANGED(id, fn) { wxEVT_COMMAND_TREE_SEL_CHANGED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 160 #define EVT_TREE_SEL_CHANGING(id, fn) { wxEVT_COMMAND_TREE_SEL_CHANGING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 161
 162 // GetCode() returns the key code
 163 // NB: this is the only message for which GetItem() is invalid (you may get the
 164 //     item from GetSelection())
 165 #define EVT_TREE_KEY_DOWN(id, fn) { wxEVT_COMMAND_TREE_KEY_DOWN, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 166
 167 // GetItem() returns the item being deleted, the associated data (if any) will
 168 // be deleted just after the return of this event handler (if any)
 169 #define EVT_TREE_DELETE_ITEM(id, fn) { wxEVT_COMMAND_TREE_DELETE_ITEM, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
 170
 171 // GetItem() returns the item that was activated (double click, enter, space)
 172 #define EVT_TREE_ITEM_ACTIVATED(id, fn) { wxEVT_COMMAND_TREE_ITEM_ACTIVATED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
 173
 174 // -----------------------------------------------------------------------------
 175 // wxTreeCtrl - the tree control
 176 // -----------------------------------------------------------------------------
 177
 178 class WXDLLEXPORT wxTreeCtrl : public wxScrolledWindow
 179 {
 180 public:
 181     // creation
 182     // --------
 183     wxTreeCtrl() { Init(); }
 184
 185     wxTreeCtrl(wxWindow *parent, wxWindowID id = -1,
 186                const wxPoint& pos = wxDefaultPosition,
 187                const wxSize& size = wxDefaultSize,
 188                long style = wxTR_HAS_BUTTONS | wxTR_LINES_AT_ROOT,
 189                const wxString& name = "wxTreeCtrl")
 190     {
 191         Create(parent, id, pos, size, style, name);
 192     }
 193
 194     virtual ~wxTreeCtrl();
 195
 196     bool Create(wxWindow *parent, wxWindowID id = -1,
 197                 const wxPoint& pos = wxDefaultPosition,
 198                 const wxSize& size = wxDefaultSize,
 199                 long style = wxTR_HAS_BUTTONS | wxTR_LINES_AT_ROOT,
 200                 const wxString& name = "wxTreeCtrl");
 201
 202     // accessors
 203     // ---------
 204
 205         // get the total number of items in the control
 206     size_t GetCount() const;
 207
 208         // indent is the number of pixels the children are indented relative to
 209         // the parents position. SetIndent() also redraws the control
 210         // immediately.
 211     unsigned int GetIndent() const { return m_indent; }
 212     void SetIndent(unsigned int indent);
 213
 214         // image list: these functions allow to associate an image list with
 215         // the control and retrieve it. Note that the control does _not_ delete
 216         // the associated image list when it's deleted in order to allow image
 217         // lists to be shared between different controls.
 218         //
 219         // The normal image list is for the icons which correspond to the
 220         // normal tree item state (whether it is selected or not).
 221         // Additionally, the application might choose to show a state icon
 222         // which corresponds to an app-defined item state (for example,
 223         // checked/unchecked) which are taken from the state image list.
 224     wxImageList *GetImageList() const;
 225     wxImageList *GetStateImageList() const;
 226
 227     void SetImageList(wxImageList *imageList);
 228     void SetStateImageList(wxImageList *imageList);
 229
 230     // Functions to work with tree ctrl items.
 231
 232     // accessors
 233     // ---------
 234
 235         // retrieve items label
 236     wxString GetItemText(const wxTreeItemId& item) const;
 237         // get the normal item image
 238     int GetItemImage(const wxTreeItemId& item) const;
 239         // get the selected item image
 240     int GetItemSelectedImage(const wxTreeItemId& item) const;
 241         // get the data associated with the item
 242     wxTreeItemData *GetItemData(const wxTreeItemId& item) const;
 243
 244     // modifiers
 245     // ---------
 246
 247         // set items label
 248     void SetItemText(const wxTreeItemId& item, const wxString& text);
 249         // set the normal item image
 250     void SetItemImage(const wxTreeItemId& item, int image);
 251         // set the selected item image
 252     void SetItemSelectedImage(const wxTreeItemId& item, int image);
 253         // associate some data with the item
 254     void SetItemData(const wxTreeItemId& item, wxTreeItemData *data);
 255
 256         // force appearance of [+] button near the item. This is useful to
 257         // allow the user to expand the items which don't have any children now
 258         // - but instead add them only when needed, thus minimizing memory
 259         // usage and loading time.
 260     void SetItemHasChildren(const wxTreeItemId& item, bool has = TRUE);
 261
 262         // the item will be shown in bold
 263     void SetItemBold(const wxTreeItemId& item, bool bold = TRUE);
 264
 265     // item status inquiries
 266     // ---------------------
 267
 268         // is the item visible (it might be outside the view or not expanded)?
 269     bool IsVisible(const wxTreeItemId& item) const;
 270         // does the item has any children?
 271     bool HasChildren(const wxTreeItemId& item) const
 272       { return ItemHasChildren(item); }
 273     bool ItemHasChildren(const wxTreeItemId& item) const;
 274         // is the item expanded (only makes sense if HasChildren())?
 275     bool IsExpanded(const wxTreeItemId& item) const;
 276         // is this item currently selected (the same as has focus)?
 277     bool IsSelected(const wxTreeItemId& item) const;
 278         // is item text in bold font?
 279     bool IsBold(const wxTreeItemId& item) const;
 280
 281     // number of children
 282     // ------------------
 283
 284         // if 'recursively' is FALSE, only immediate children count, otherwise
 285         // the returned number is the number of all items in this branch
 286     size_t GetChildrenCount(const wxTreeItemId& item, bool recursively = TRUE);
 287
 288     // navigation
 289     // ----------
 290
 291     // wxTreeItemId.IsOk() will return FALSE if there is no such item
 292
 293         // get the root tree item
 294     wxTreeItemId GetRootItem() const { return m_anchor; }
 295
 296         // get the item currently selected (may return NULL if no selection)
 297     wxTreeItemId GetSelection() const { return m_current; }
 298
 299         // get the parent of this item (may return NULL if root)
 300     wxTreeItemId GetParent(const wxTreeItemId& item) const;
 301
 302         // for this enumeration function you must pass in a "cookie" parameter
 303         // which is opaque for the application but is necessary for the library
 304         // to make these functions reentrant (i.e. allow more than one
 305         // enumeration on one and the same object simultaneously). Of course,
 306         // the "cookie" passed to GetFirstChild() and GetNextChild() should be
 307         // the same!
 308
 309         // get the first child of this item
 310     wxTreeItemId GetFirstChild(const wxTreeItemId& item, long& cookie) const;
 311         // get the next child
 312     wxTreeItemId GetNextChild(const wxTreeItemId& item, long& cookie) const;
 313
 314         // get the next sibling of this item
 315     wxTreeItemId GetNextSibling(const wxTreeItemId& item) const;
 316         // get the previous sibling
 317     wxTreeItemId GetPrevSibling(const wxTreeItemId& item) const;
 318
 319         // get first visible item
 320     wxTreeItemId GetFirstVisibleItem() const;
 321         // get the next visible item: item must be visible itself!
 322         // see IsVisible() and wxTreeCtrl::GetFirstVisibleItem()
 323     wxTreeItemId GetNextVisible(const wxTreeItemId& item) const;
 324         // get the previous visible item: item must be visible itself!
 325     wxTreeItemId GetPrevVisible(const wxTreeItemId& item) const;
 326
 327     // operations
 328     // ----------
 329
 330         // add the root node to the tree
 331     wxTreeItemId AddRoot(const wxString& text,
 332                          int image = -1, int selectedImage = -1,
 333                          wxTreeItemData *data = NULL);
 334
 335         // insert a new item in as the first child of the parent
 336     wxTreeItemId PrependItem(const wxTreeItemId& parent,
 337                              const wxString& text,
 338                              int image = -1, int selectedImage = -1,
 339                              wxTreeItemData *data = NULL);
 340
 341         // insert a new item after a given one
 342     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 343                             const wxTreeItemId& idPrevious,
 344                             const wxString& text,
 345                             int image = -1, int selectedImage = -1,
 346                             wxTreeItemData *data = NULL);
 347
 348         // insert a new item in as the last child of the parent
 349     wxTreeItemId AppendItem(const wxTreeItemId& parent,
 350                             const wxString& text,
 351                             int image = -1, int selectedImage = -1,
 352                             wxTreeItemData *data = NULL);
 353
 354         // delete this item and associated data if any
 355     void Delete(const wxTreeItemId& item);
 356         // delete all items from the tree
 357     void DeleteAllItems();
 358
 359         // expand this item
 360     void Expand(const wxTreeItemId& item);
 361         // collapse the item without removing its children
 362     void Collapse(const wxTreeItemId& item);
 363         // collapse the item and remove all children
 364     void CollapseAndReset(const wxTreeItemId& item);
 365         // toggles the current state
 366     void Toggle(const wxTreeItemId& item);
 367
 368         // remove the selection from currently selected item (if any)
 369     void Unselect();
 370         // select this item
 371     void SelectItem(const wxTreeItemId& item);
 372         // make sure this item is visible (expanding the parent item and/or
 373         // scrolling to this item if necessary)
 374     void EnsureVisible(const wxTreeItemId& item);
 375         // scroll to this item (but don't expand its parent)
 376     void ScrollTo(const wxTreeItemId& item);
 377
 378         // start editing the item label: this (temporarily) replaces the item
 379         // with a one line edit control. The item will be selected if it hadn't
 380         // been before. textCtrlClass parameter allows you to create an edit
 381         // control of arbitrary user-defined class deriving from wxTextCtrl.
 382     wxTextCtrl* EditLabel(const wxTreeItemId& item,
 383                           wxClassInfo* textCtrlClass = CLASSINFO(wxTextCtrl));
 384         // returns the same pointer as StartEdit() if the item is being edited,
 385         // NULL otherwise (it's assumed that no more than one item may be
 386         // edited simultaneously)
 387     wxTextCtrl* GetEditControl() const;
 388         // end editing and accept or discard the changes to item label
 389     void EndEditLabel(const wxTreeItemId& item, bool discardChanges = FALSE);
 390
 391         // sort the children of this item using the specified callback function
 392         // (it should return -1, 0 or +1 as usual), if it's not specified
 393         // alphabetical comparaison is performed.
 394         //
 395         // NB: this function is not reentrant!
 396     void SortChildren(const wxTreeItemId& item,
 397                       wxTreeItemCmpFunc *cmpFunction = NULL);
 398
 399     void OnPaint( wxPaintEvent &event );
 400     void OnSetFocus( wxFocusEvent &event );
 401     void OnKillFocus( wxFocusEvent &event );
 402     void OnChar( wxKeyEvent &event );
 403     void OnMouse( wxMouseEvent &event );
 404     void OnIdle( wxIdleEvent &event );
 405
 406 protected:
 407     wxGenericTreeItem   *m_anchor;
 408     wxGenericTreeItem   *m_current;
 409     bool                 m_hasFocus;
 410     bool                 m_dirty;
 411     int                  m_xScroll,m_yScroll;
 412     unsigned int         m_indent;
 413     int                  m_lineHeight;
 414     wxPen                m_dottedPen;
 415     wxBrush             *m_hilightBrush;
 416     wxImageList         *m_imageListNormal,
 417                         *m_imageListState;
 418
 419     // the common part of all ctors
 420     void Init();
 421
 422     // misc helpers
 423     wxTreeItemId DoInsertItem(const wxTreeItemId& parent,
 424                               size_t previous,
 425                               const wxString& text,
 426                               int image, int selectedImage,
 427                               wxTreeItemData *data);
 428
 429     void AdjustMyScrollbars();
 430     void PaintLevel( wxGenericTreeItem *item, wxDC& dc, int level, int &y );
 431     void PaintItem( wxGenericTreeItem *item, wxDC& dc);
 432
 433     void CalculateLevel( wxGenericTreeItem *item, wxDC &dc, int level, int &y );
 434     void CalculatePositions();
 435
 436     void RefreshSubtree( wxGenericTreeItem *item );
 437     void RefreshLine( wxGenericTreeItem *item );
 438
 439 private:
 440     DECLARE_EVENT_TABLE()
 441     DECLARE_DYNAMIC_CLASS(wxTreeCtrl)
 442 };
 443
 444 #endif // _GENERIC_TREECTRL_H_
 445