include/wx/msw/treectrl.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        treectrl.h
   3 // Purpose:     wxTreeCtrl class
   4 // Author:      Julian Smart
   5 // Modified by: Vadim Zeitlin to be less MSW-specific on 10/10/98
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_TREECTRL_H_
  13 #define _WX_TREECTRL_H_
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 #ifdef __GNUG__
  20     #pragma interface "treectrl.h"
  21 #endif
  22
  23 #include "wx/textctrl.h"
  24 #include "wx/dynarray.h"
  25
  26 #ifdef __GNUWIN32__
  27     // Cygwin windows.h defines these identifiers
  28     #undef GetFirstChild
  29     #undef GetNextSibling
  30 #endif // Cygwin
  31
  32 // the type for "untyped" data
  33 typedef long wxDataType;
  34
  35 // fwd decl
  36 class  WXDLLEXPORT wxImageList;
  37 struct WXDLLEXPORT wxTreeViewItem;
  38
  39 // a callback function used for sorting tree items, it should return -1 if the
  40 // first item precedes the second, +1 if the second precedes the first or 0 if
  41 // they're equivalent
  42 class wxTreeItemData;
  43
  44 // NB: all the following flags are for compatbility only and will be removed in the
  45 //     next versions
  46
  47 // flags for deprecated `Expand(int action)'
  48 enum
  49 {
  50     wxTREE_EXPAND_EXPAND,
  51     wxTREE_EXPAND_COLLAPSE,
  52     wxTREE_EXPAND_COLLAPSE_RESET,
  53     wxTREE_EXPAND_TOGGLE
  54 };
  55
  56 // flags for deprecated InsertItem() variant
  57 #define wxTREE_INSERT_FIRST 0xFFFF0001
  58 #define wxTREE_INSERT_LAST  0xFFFF0002
  59
  60 // ----------------------------------------------------------------------------
  61 // wxTreeItemId identifies an element of the tree. In this implementation, it's
  62 // just a trivial wrapper around Win32 HTREEITEM. It's opaque for the
  63 // application.
  64 // ----------------------------------------------------------------------------
  65 class WXDLLEXPORT wxTreeItemId
  66 {
  67 public:
  68     // ctors
  69         // 0 is invalid value for HTREEITEM
  70     wxTreeItemId() { m_itemId = 0; }
  71
  72         // default copy ctor/assignment operator are ok for us
  73
  74     // accessors
  75         // is this a valid tree item?
  76     bool IsOk() const { return m_itemId != 0; }
  77
  78     // conversion to/from either real (system-dependent) tree item id or
  79     // to "long" which used to be the type for tree item ids in previous
  80     // versions of wxWindows
  81
  82     // for wxTreeCtrl usage only
  83     wxTreeItemId(WXHTREEITEM itemId) { m_itemId = (long)itemId; }
  84     operator WXHTREEITEM() const { return (WXHTREEITEM)m_itemId; }
  85
  86     void operator=(WXHTREEITEM item) { m_itemId = (long) item; }
  87
  88 protected:
  89     long m_itemId;
  90 };
  91
  92 WX_DEFINE_EXPORTED_ARRAY(WXHTREEITEM, wxArrayTreeItemIds);
  93
  94 // ----------------------------------------------------------------------------
  95 // wxTreeItemData is some (arbitrary) user class associated with some item. The
  96 // main advantage of having this class (compared to old untyped interface) is
  97 // that wxTreeItemData's are destroyed automatically by the tree and, as this
  98 // class has virtual dtor, it means that the memory will be automatically
  99 // freed. OTOH, we don't just use wxObject instead of wxTreeItemData because
 100 // the size of this class is critical: in any real application, each tree leaf
 101 // will have wxTreeItemData associated with it and number of leaves may be
 102 // quite big.
 103 //
 104 // Because the objects of this class are deleted by the tree, they should
 105 // always be allocated on the heap!
 106 // ----------------------------------------------------------------------------
 107 class WXDLLEXPORT wxTreeItemData : private wxTreeItemId
 108 {
 109 public:
 110     // default ctor/copy ctor/assignment operator are ok
 111
 112     // dtor is virtual and all the items are deleted by the tree control when
 113     // it's deleted, so you normally don't have to care about freeing memory
 114     // allocated in your wxTreeItemData-derived class
 115     virtual ~wxTreeItemData() { }
 116
 117     // accessors: set/get the item associated with this node
 118     void SetId(const wxTreeItemId& id) { m_itemId = id; }
 119     const wxTreeItemId GetId() const { return *this; }
 120 };
 121
 122 // ----------------------------------------------------------------------------
 123 // wxTreeCtrl
 124 // ----------------------------------------------------------------------------
 125 class WXDLLEXPORT wxTreeCtrl : public wxControl
 126 {
 127 public:
 128     // creation
 129     // --------
 130     wxTreeCtrl() { Init(); }
 131
 132     wxTreeCtrl(wxWindow *parent, wxWindowID id = -1,
 133                const wxPoint& pos = wxDefaultPosition,
 134                const wxSize& size = wxDefaultSize,
 135                long style = wxTR_HAS_BUTTONS | wxTR_LINES_AT_ROOT,
 136                const wxValidator& validator = wxDefaultValidator,
 137                const wxString& name = "wxTreeCtrl")
 138     {
 139         Create(parent, id, pos, size, style, validator, name);
 140     }
 141
 142     virtual ~wxTreeCtrl();
 143
 144     bool Create(wxWindow *parent, wxWindowID id = -1,
 145                 const wxPoint& pos = wxDefaultPosition,
 146                 const wxSize& size = wxDefaultSize,
 147                 long style = wxTR_HAS_BUTTONS | wxTR_LINES_AT_ROOT,
 148                 const wxValidator& validator = wxDefaultValidator,
 149                 const wxString& name = "wxTreeCtrl");
 150
 151     // accessors
 152     // ---------
 153
 154         // get the total number of items in the control
 155     size_t GetCount() const;
 156
 157         // indent is the number of pixels the children are indented relative to
 158         // the parents position. SetIndent() also redraws the control
 159         // immediately.
 160     unsigned int GetIndent() const;
 161     void SetIndent(unsigned int indent);
 162
 163     // spacing is the number of pixels between the start and the Text
 164         // not implemented under wxMSW
 165     unsigned int GetSpacing() const { return 18; } // return wxGTK default
 166     void SetSpacing(unsigned int WXUNUSED(spacing)) { }
 167
 168         // image list: these functions allow to associate an image list with
 169         // the control and retrieve it. Note that the control does _not_ delete
 170         // the associated image list when it's deleted in order to allow image
 171         // lists to be shared between different controls.
 172         //
 173         // The normal image list is for the icons which correspond to the
 174         // normal tree item state (whether it is selected or not).
 175         // Additionally, the application might choose to show a state icon
 176         // which corresponds to an app-defined item state (for example,
 177         // checked/unchecked) which are taken from the state image list.
 178     wxImageList *GetImageList() const;
 179     wxImageList *GetStateImageList() const;
 180
 181     void SetImageList(wxImageList *imageList);
 182     void SetStateImageList(wxImageList *imageList);
 183
 184     // Functions to work with tree ctrl items. Unfortunately, they can _not_ be
 185     // member functions of wxTreeItem because they must know the tree the item
 186     // belongs to for Windows implementation and storing the pointer to
 187     // wxTreeCtrl in each wxTreeItem is just too much waste.
 188
 189     // accessors
 190     // ---------
 191
 192         // retrieve items label
 193     wxString GetItemText(const wxTreeItemId& item) const;
 194         // get one of the images associated with the item (normal by default)
 195     int GetItemImage(const wxTreeItemId& item,
 196                      wxTreeItemIcon which = wxTreeItemIcon_Normal) const;
 197         // get the data associated with the item
 198     wxTreeItemData *GetItemData(const wxTreeItemId& item) const;
 199
 200     // modifiers
 201     // ---------
 202
 203         // set items label
 204     void SetItemText(const wxTreeItemId& item, const wxString& text);
 205         // get one of the images associated with the item (normal by default)
 206     void SetItemImage(const wxTreeItemId& item, int image,
 207                       wxTreeItemIcon which = wxTreeItemIcon_Normal);
 208         // associate some data with the item
 209     void SetItemData(const wxTreeItemId& item, wxTreeItemData *data);
 210
 211         // force appearance of [+] button near the item. This is useful to
 212         // allow the user to expand the items which don't have any children now
 213         // - but instead add them only when needed, thus minimizing memory
 214         // usage and loading time.
 215     void SetItemHasChildren(const wxTreeItemId& item, bool has = TRUE);
 216
 217         // the item will be shown in bold
 218     void SetItemBold(const wxTreeItemId& item, bool bold = TRUE);
 219
 220         // the item will be shown with a drop highlight
 221     void SetItemDropHighlight(const wxTreeItemId& item, bool highlight = TRUE);
 222
 223         // set the items text colour
 224     void SetItemTextColour(const wxTreeItemId& item, const wxColour& col);
 225
 226         // set the items background colour
 227     void SetItemBackgroundColour(const wxTreeItemId& item, const wxColour& col);
 228
 229         // set the items font (should be of the same height for all items)
 230     void SetItemFont(const wxTreeItemId& item, const wxFont& font);
 231
 232     // item status inquiries
 233     // ---------------------
 234
 235         // is the item visible (it might be outside the view or not expanded)?
 236     bool IsVisible(const wxTreeItemId& item) const;
 237         // does the item has any children?
 238     bool ItemHasChildren(const wxTreeItemId& item) const;
 239         // is the item expanded (only makes sense if HasChildren())?
 240     bool IsExpanded(const wxTreeItemId& item) const;
 241         // is this item currently selected (the same as has focus)?
 242     bool IsSelected(const wxTreeItemId& item) const;
 243         // is item text in bold font?
 244     bool IsBold(const wxTreeItemId& item) const;
 245
 246     // number of children
 247     // ------------------
 248
 249         // if 'recursively' is FALSE, only immediate children count, otherwise
 250         // the returned number is the number of all items in this branch
 251     size_t GetChildrenCount(const wxTreeItemId& item,
 252                             bool recursively = TRUE) const;
 253
 254     // navigation
 255     // ----------
 256
 257     // wxTreeItemId.IsOk() will return FALSE if there is no such item
 258
 259         // get the root tree item
 260     wxTreeItemId GetRootItem() const;
 261
 262         // get the item currently selected (may return NULL if no selection)
 263     wxTreeItemId GetSelection() const;
 264
 265         // get the items currently selected, return the number of such item
 266         //
 267         // NB: this operation is expensive and can take a long time for a
 268         //     control with a lot of items (~ O(number of items)).
 269     size_t GetSelections(wxArrayTreeItemIds& selections) const;
 270
 271         // get the parent of this item (may return NULL if root)
 272     wxTreeItemId GetParent(const wxTreeItemId& item) const;
 273
 274         // for this enumeration function you must pass in a "cookie" parameter
 275         // which is opaque for the application but is necessary for the library
 276         // to make these functions reentrant (i.e. allow more than one
 277         // enumeration on one and the same object simultaneously). Of course,
 278         // the "cookie" passed to GetFirstChild() and GetNextChild() should be
 279         // the same!
 280
 281         // get the first child of this item
 282     wxTreeItemId GetFirstChild(const wxTreeItemId& item, long& _cookie) const;
 283         // get the next child
 284     wxTreeItemId GetNextChild(const wxTreeItemId& item, long& _cookie) const;
 285         // get the last child of this item - this method doesn't use cookies
 286     wxTreeItemId GetLastChild(const wxTreeItemId& item) const;
 287
 288         // get the next sibling of this item
 289     wxTreeItemId GetNextSibling(const wxTreeItemId& item) const;
 290         // get the previous sibling
 291     wxTreeItemId GetPrevSibling(const wxTreeItemId& item) const;
 292
 293         // get first visible item
 294     wxTreeItemId GetFirstVisibleItem() const;
 295         // get the next visible item: item must be visible itself!
 296         // see IsVisible() and wxTreeCtrl::GetFirstVisibleItem()
 297     wxTreeItemId GetNextVisible(const wxTreeItemId& item) const;
 298         // get the previous visible item: item must be visible itself!
 299     wxTreeItemId GetPrevVisible(const wxTreeItemId& item) const;
 300
 301     // operations
 302     // ----------
 303
 304         // add the root node to the tree
 305     wxTreeItemId AddRoot(const wxString& text,
 306                          int image = -1, int selectedImage = -1,
 307                          wxTreeItemData *data = NULL);
 308
 309         // insert a new item in as the first child of the parent
 310     wxTreeItemId PrependItem(const wxTreeItemId& parent,
 311                              const wxString& text,
 312                              int image = -1, int selectedImage = -1,
 313                              wxTreeItemData *data = NULL);
 314
 315         // insert a new item after a given one
 316     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 317                             const wxTreeItemId& idPrevious,
 318                             const wxString& text,
 319                             int image = -1, int selectedImage = -1,
 320                             wxTreeItemData *data = NULL);
 321
 322         // insert a new item in as the last child of the parent
 323     wxTreeItemId AppendItem(const wxTreeItemId& parent,
 324                             const wxString& text,
 325                             int image = -1, int selectedImage = -1,
 326                             wxTreeItemData *data = NULL);
 327
 328         // delete this item and associated data if any
 329     void Delete(const wxTreeItemId& item);
 330         // delete all children (but don't delete the item itself)
 331         // NB: this won't send wxEVT_COMMAND_TREE_ITEM_DELETED events
 332     void DeleteChildren(const wxTreeItemId& item);
 333         // delete all items from the tree
 334         // NB: this won't send wxEVT_COMMAND_TREE_ITEM_DELETED events
 335     void DeleteAllItems();
 336
 337         // expand this item
 338     void Expand(const wxTreeItemId& item);
 339         // collapse the item without removing its children
 340     void Collapse(const wxTreeItemId& item);
 341         // collapse the item and remove all children
 342     void CollapseAndReset(const wxTreeItemId& item);
 343         // toggles the current state
 344     void Toggle(const wxTreeItemId& item);
 345
 346         // remove the selection from currently selected item (if any)
 347     void Unselect();
 348         // unselect all items (only makes sense for multiple selection control)
 349     void UnselectAll();
 350         // select this item
 351     void SelectItem(const wxTreeItemId& item);
 352         // make sure this item is visible (expanding the parent item and/or
 353         // scrolling to this item if necessary)
 354     void EnsureVisible(const wxTreeItemId& item);
 355         // scroll to this item (but don't expand its parent)
 356     void ScrollTo(const wxTreeItemId& item);
 357
 358         // start editing the item label: this (temporarily) replaces the item
 359         // with a one line edit control. The item will be selected if it hadn't
 360         // been before. textCtrlClass parameter allows you to create an edit
 361         // control of arbitrary user-defined class deriving from wxTextCtrl.
 362     wxTextCtrl* EditLabel(const wxTreeItemId& item,
 363                           wxClassInfo* textCtrlClass = CLASSINFO(wxTextCtrl));
 364         // returns the same pointer as StartEdit() if the item is being edited,
 365         // NULL otherwise (it's assumed that no more than one item may be
 366         // edited simultaneously)
 367     wxTextCtrl* GetEditControl() const;
 368         // end editing and accept or discard the changes to item label
 369     void EndEditLabel(const wxTreeItemId& item, bool discardChanges = FALSE);
 370
 371     // sorting
 372         // this function is called to compare 2 items and should return -1, 0
 373         // or +1 if the first item is less than, equal to or greater than the
 374         // second one. The base class version performs alphabetic comparaison
 375         // of item labels (GetText)
 376     virtual int OnCompareItems(const wxTreeItemId& item1,
 377                                const wxTreeItemId& item2);
 378         // sort the children of this item using OnCompareItems
 379         //
 380         // NB: this function is not reentrant and not MT-safe (FIXME)!
 381     void SortChildren(const wxTreeItemId& item);
 382
 383     // helpers
 384     // -------
 385
 386         // determine to which item (if any) belongs the given point (the
 387         // coordinates specified are relative to the client area of tree ctrl)
 388         // and fill the flags parameter with a bitmask of wxTREE_HITTEST_xxx
 389         // constants.
 390         //
 391         // The first function is more portable (because easier to implement
 392         // on other platforms), but the second one returns some extra info.
 393     wxTreeItemId HitTest(const wxPoint& point)
 394         { int dummy; return HitTest(point, dummy); }
 395     wxTreeItemId HitTest(const wxPoint& point, int& flags);
 396
 397         // get the bounding rectangle of the item (or of its label only)
 398     bool GetBoundingRect(const wxTreeItemId& item,
 399                          wxRect& rect,
 400                          bool textOnly = FALSE) const;
 401
 402     // deprecated
 403     // ----------
 404
 405     // these methods are deprecated and will be removed in future versions of
 406     // wxWindows, they're here for compatibility only, don't use them in new
 407     // code (the comments indicate why these methods are now useless and how to
 408     // replace them)
 409
 410         // use Expand, Collapse, CollapseAndReset or Toggle
 411     void ExpandItem(const wxTreeItemId& item, int action);
 412
 413         // use AddRoot, PrependItem or AppendItem
 414     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 415                             const wxString& text,
 416                             int image = -1, int selImage = -1,
 417                             long insertAfter = wxTREE_INSERT_LAST);
 418
 419         // use Set/GetImageList and Set/GetStateImageList
 420     wxImageList *GetImageList(int) const
 421         { return GetImageList(); }
 422     void SetImageList(wxImageList *imageList, int)
 423         { SetImageList(imageList); }
 424
 425     // use Set/GetItemImage directly
 426         // get the selected item image
 427     int GetItemSelectedImage(const wxTreeItemId& item) const
 428         { return GetItemImage(item, wxTreeItemIcon_Selected); }
 429         // set the selected item image
 430     void SetItemSelectedImage(const wxTreeItemId& item, int image)
 431         { SetItemImage(item, image, wxTreeItemIcon_Selected); }
 432
 433     // implementation
 434     // --------------
 435     virtual bool MSWCommand(WXUINT param, WXWORD id);
 436     virtual bool MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result);
 437
 438     // get/set the check state for the item (only for wxTR_MULTIPLE)
 439     bool IsItemChecked(const wxTreeItemId& item) const;
 440     void SetItemCheck(const wxTreeItemId& item, bool check = TRUE);
 441
 442 protected:
 443     // SetImageList helper
 444     void SetAnyImageList(wxImageList *imageList, int which);
 445
 446     wxTextCtrl  *m_textCtrl;        // used while editing the item label
 447     wxImageList *m_imageListNormal, // images for tree elements
 448                 *m_imageListState;  // special images for app defined states
 449
 450 private:
 451     // the common part of all ctors
 452     void Init();
 453
 454     // helper functions
 455     inline bool DoGetItem(wxTreeViewItem *tvItem) const;
 456     inline void DoSetItem(wxTreeViewItem *tvItem);
 457
 458     inline void DoExpand(const wxTreeItemId& item, int flag);
 459
 460     wxTreeItemId DoInsertItem(const wxTreeItemId& parent,
 461                               wxTreeItemId hInsertAfter,
 462                               const wxString& text,
 463                               int image, int selectedImage,
 464                               wxTreeItemData *data);
 465
 466     int DoGetItemImageFromData(const wxTreeItemId& item,
 467                                wxTreeItemIcon which) const;
 468     void DoSetItemImageFromData(const wxTreeItemId& item,
 469                                 int image,
 470                                 wxTreeItemIcon which) const;
 471     void DoSetItemImages(const wxTreeItemId& item, int image, int imageSel);
 472
 473     void DeleteTextCtrl();
 474
 475     // support for additional item images
 476     friend class wxTreeItemIndirectData;
 477     void SetIndirectItemData(const wxTreeItemId& item,
 478                              wxTreeItemIndirectData *data);
 479     bool HasIndirectData(const wxTreeItemId& item) const;
 480
 481     // the array storing all item ids which have indirect data
 482     wxArrayTreeItemIds m_itemsWithIndirectData;
 483
 484     // the hash storing the items attributes (indexed by items ids)
 485     wxHashTable m_attrs;
 486
 487     // TRUE if the hash above is not empty
 488     bool m_hasAnyAttr;
 489
 490     DECLARE_DYNAMIC_CLASS(wxTreeCtrl)
 491 };
 492
 493 #endif
 494     // _WX_TREECTRL_H_