include/wx/treectrl.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/treectrl.h
   3 // Purpose:     wxTreeCtrl base header
   4 // Author:      Karsten Ballueder
   5 // Modified by:
   6 // Created:
   7 // Copyright:   (c) Karsten Ballueder
   8 // RCS-ID:      $Id$
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_TREECTRL_H_BASE_
  13 #define _WX_TREECTRL_H_BASE_
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 #include "wx/defs.h"
  20
  21 #if wxUSE_TREECTRL
  22
  23 #include "wx/control.h"
  24 #include "wx/treebase.h"
  25 #include "wx/textctrl.h" // wxTextCtrl::ms_classinfo used through CLASSINFO macro
  26
  27 class WXDLLIMPEXP_FWD_CORE wxImageList;
  28
  29 // ----------------------------------------------------------------------------
  30 // wxTreeCtrlBase
  31 // ----------------------------------------------------------------------------
  32
  33 class WXDLLIMPEXP_CORE wxTreeCtrlBase : public wxControl
  34 {
  35 public:
  36     wxTreeCtrlBase()
  37     {
  38         m_imageListNormal =
  39         m_imageListState = NULL;
  40         m_ownsImageListNormal =
  41         m_ownsImageListState = false;
  42
  43         // arbitrary default
  44         m_spacing = 18;
  45
  46         // quick DoGetBestSize calculation
  47         m_quickBestSize = true;
  48     }
  49
  50     virtual ~wxTreeCtrlBase();
  51
  52     // accessors
  53     // ---------
  54
  55         // get the total number of items in the control
  56     virtual unsigned int GetCount() const = 0;
  57
  58         // indent is the number of pixels the children are indented relative to
  59         // the parents position. SetIndent() also redraws the control
  60         // immediately.
  61     virtual unsigned int GetIndent() const = 0;
  62     virtual void SetIndent(unsigned int indent) = 0;
  63
  64         // spacing is the number of pixels between the start and the Text
  65         // (has no effect under wxMSW)
  66     unsigned int GetSpacing() const { return m_spacing; }
  67     void SetSpacing(unsigned int spacing) { m_spacing = spacing; }
  68
  69         // image list: these functions allow to associate an image list with
  70         // the control and retrieve it. Note that the control does _not_ delete
  71         // the associated image list when it's deleted in order to allow image
  72         // lists to be shared between different controls.
  73         //
  74         // The normal image list is for the icons which correspond to the
  75         // normal tree item state (whether it is selected or not).
  76         // Additionally, the application might choose to show a state icon
  77         // which corresponds to an app-defined item state (for example,
  78         // checked/unchecked) which are taken from the state image list.
  79     wxImageList *GetImageList() const { return m_imageListNormal; }
  80     wxImageList *GetStateImageList() const { return m_imageListState; }
  81
  82     virtual void SetImageList(wxImageList *imageList) = 0;
  83     virtual void SetStateImageList(wxImageList *imageList) = 0;
  84     void AssignImageList(wxImageList *imageList)
  85     {
  86         SetImageList(imageList);
  87         m_ownsImageListNormal = true;
  88     }
  89     void AssignStateImageList(wxImageList *imageList)
  90     {
  91         SetStateImageList(imageList);
  92         m_ownsImageListState = true;
  93     }
  94
  95
  96     // Functions to work with tree ctrl items. Unfortunately, they can _not_ be
  97     // member functions of wxTreeItem because they must know the tree the item
  98     // belongs to for Windows implementation and storing the pointer to
  99     // wxTreeCtrl in each wxTreeItem is just too much waste.
 100
 101     // accessors
 102     // ---------
 103
 104         // retrieve items label
 105     virtual wxString GetItemText(const wxTreeItemId& item) const = 0;
 106         // get one of the images associated with the item (normal by default)
 107     virtual int GetItemImage(const wxTreeItemId& item,
 108                      wxTreeItemIcon which = wxTreeItemIcon_Normal) const = 0;
 109         // get the data associated with the item
 110     virtual wxTreeItemData *GetItemData(const wxTreeItemId& item) const = 0;
 111
 112         // get the item's text colour
 113     virtual wxColour GetItemTextColour(const wxTreeItemId& item) const = 0;
 114
 115         // get the item's background colour
 116     virtual wxColour GetItemBackgroundColour(const wxTreeItemId& item) const = 0;
 117
 118         // get the item's font
 119     virtual wxFont GetItemFont(const wxTreeItemId& item) const = 0;
 120
 121         // get the items state
 122     int GetItemState(const wxTreeItemId& item) const
 123     {
 124         return DoGetItemState(item);
 125     }
 126
 127     // modifiers
 128     // ---------
 129
 130         // set items label
 131     virtual void SetItemText(const wxTreeItemId& item, const wxString& text) = 0;
 132         // set one of the images associated with the item (normal by default)
 133     virtual void SetItemImage(const wxTreeItemId& item,
 134                               int image,
 135                               wxTreeItemIcon which = wxTreeItemIcon_Normal) = 0;
 136         // associate some data with the item
 137     virtual void SetItemData(const wxTreeItemId& item, wxTreeItemData *data) = 0;
 138
 139         // force appearance of [+] button near the item. This is useful to
 140         // allow the user to expand the items which don't have any children now
 141         // - but instead add them only when needed, thus minimizing memory
 142         // usage and loading time.
 143     virtual void SetItemHasChildren(const wxTreeItemId& item,
 144                                     bool has = true) = 0;
 145
 146         // the item will be shown in bold
 147     virtual void SetItemBold(const wxTreeItemId& item, bool bold = true) = 0;
 148
 149         // the item will be shown with a drop highlight
 150     virtual void SetItemDropHighlight(const wxTreeItemId& item,
 151                                       bool highlight = true) = 0;
 152
 153         // set the items text colour
 154     virtual void SetItemTextColour(const wxTreeItemId& item,
 155                                    const wxColour& col) = 0;
 156
 157         // set the items background colour
 158     virtual void SetItemBackgroundColour(const wxTreeItemId& item,
 159                                          const wxColour& col) = 0;
 160
 161         // set the items font (should be of the same height for all items)
 162     virtual void SetItemFont(const wxTreeItemId& item,
 163                              const wxFont& font) = 0;
 164
 165         // set the items state (special state values: wxTREE_ITEMSTATE_NONE/NEXT/PREV)
 166     void SetItemState(const wxTreeItemId& item, int state);
 167
 168     // item status inquiries
 169     // ---------------------
 170
 171         // is the item visible (it might be outside the view or not expanded)?
 172     virtual bool IsVisible(const wxTreeItemId& item) const = 0;
 173         // does the item has any children?
 174     virtual bool ItemHasChildren(const wxTreeItemId& item) const = 0;
 175         // same as above
 176     bool HasChildren(const wxTreeItemId& item) const
 177       { return ItemHasChildren(item); }
 178         // is the item expanded (only makes sense if HasChildren())?
 179     virtual bool IsExpanded(const wxTreeItemId& item) const = 0;
 180         // is this item currently selected (the same as has focus)?
 181     virtual bool IsSelected(const wxTreeItemId& item) const = 0;
 182         // is item text in bold font?
 183     virtual bool IsBold(const wxTreeItemId& item) const = 0;
 184         // is the control empty?
 185     bool IsEmpty() const;
 186
 187
 188     // number of children
 189     // ------------------
 190
 191         // if 'recursively' is false, only immediate children count, otherwise
 192         // the returned number is the number of all items in this branch
 193     virtual size_t GetChildrenCount(const wxTreeItemId& item,
 194                                     bool recursively = true) const = 0;
 195
 196     // navigation
 197     // ----------
 198
 199     // wxTreeItemId.IsOk() will return false if there is no such item
 200
 201         // get the root tree item
 202     virtual wxTreeItemId GetRootItem() const = 0;
 203
 204         // get the item currently selected (may return NULL if no selection)
 205     virtual wxTreeItemId GetSelection() const = 0;
 206
 207         // get the items currently selected, return the number of such item
 208         //
 209         // NB: this operation is expensive and can take a long time for a
 210         //     control with a lot of items (~ O(number of items)).
 211     virtual size_t GetSelections(wxArrayTreeItemIds& selections) const = 0;
 212
 213         // get the last item to be clicked when the control has wxTR_MULTIPLE
 214         // equivalent to GetSelection() if not wxTR_MULTIPLE
 215     virtual wxTreeItemId GetFocusedItem() const = 0;
 216
 217         // get the parent of this item (may return NULL if root)
 218     virtual wxTreeItemId GetItemParent(const wxTreeItemId& item) const = 0;
 219
 220         // for this enumeration function you must pass in a "cookie" parameter
 221         // which is opaque for the application but is necessary for the library
 222         // to make these functions reentrant (i.e. allow more than one
 223         // enumeration on one and the same object simultaneously). Of course,
 224         // the "cookie" passed to GetFirstChild() and GetNextChild() should be
 225         // the same!
 226
 227         // get the first child of this item
 228     virtual wxTreeItemId GetFirstChild(const wxTreeItemId& item,
 229                                        wxTreeItemIdValue& cookie) const = 0;
 230         // get the next child
 231     virtual wxTreeItemId GetNextChild(const wxTreeItemId& item,
 232                                       wxTreeItemIdValue& cookie) const = 0;
 233         // get the last child of this item - this method doesn't use cookies
 234     virtual wxTreeItemId GetLastChild(const wxTreeItemId& item) const = 0;
 235
 236         // get the next sibling of this item
 237     virtual wxTreeItemId GetNextSibling(const wxTreeItemId& item) const = 0;
 238         // get the previous sibling
 239     virtual wxTreeItemId GetPrevSibling(const wxTreeItemId& item) const = 0;
 240
 241         // get first visible item
 242     virtual wxTreeItemId GetFirstVisibleItem() const = 0;
 243         // get the next visible item: item must be visible itself!
 244         // see IsVisible() and wxTreeCtrl::GetFirstVisibleItem()
 245     virtual wxTreeItemId GetNextVisible(const wxTreeItemId& item) const = 0;
 246         // get the previous visible item: item must be visible itself!
 247     virtual wxTreeItemId GetPrevVisible(const wxTreeItemId& item) const = 0;
 248
 249     // operations
 250     // ----------
 251
 252         // add the root node to the tree
 253     virtual wxTreeItemId AddRoot(const wxString& text,
 254                                  int image = -1, int selImage = -1,
 255                                  wxTreeItemData *data = NULL) = 0;
 256
 257         // insert a new item in as the first child of the parent
 258     wxTreeItemId PrependItem(const wxTreeItemId& parent,
 259                              const wxString& text,
 260                              int image = -1, int selImage = -1,
 261                              wxTreeItemData *data = NULL)
 262     {
 263         return DoInsertItem(parent, 0u, text, image, selImage, data);
 264     }
 265
 266         // insert a new item after a given one
 267     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 268                             const wxTreeItemId& idPrevious,
 269                             const wxString& text,
 270                             int image = -1, int selImage = -1,
 271                             wxTreeItemData *data = NULL)
 272     {
 273         return DoInsertAfter(parent, idPrevious, text, image, selImage, data);
 274     }
 275
 276         // insert a new item before the one with the given index
 277     wxTreeItemId InsertItem(const wxTreeItemId& parent,
 278                             size_t pos,
 279                             const wxString& text,
 280                             int image = -1, int selImage = -1,
 281                             wxTreeItemData *data = NULL)
 282     {
 283         return DoInsertItem(parent, pos, text, image, selImage, data);
 284     }
 285
 286         // insert a new item in as the last child of the parent
 287     wxTreeItemId AppendItem(const wxTreeItemId& parent,
 288                             const wxString& text,
 289                             int image = -1, int selImage = -1,
 290                             wxTreeItemData *data = NULL)
 291     {
 292         return DoInsertItem(parent, (size_t)-1, text, image, selImage, data);
 293     }
 294
 295         // delete this item and associated data if any
 296     virtual void Delete(const wxTreeItemId& item) = 0;
 297         // delete all children (but don't delete the item itself)
 298         // NB: this won't send wxEVT_COMMAND_TREE_ITEM_DELETED events
 299     virtual void DeleteChildren(const wxTreeItemId& item) = 0;
 300         // delete all items from the tree
 301         // NB: this won't send wxEVT_COMMAND_TREE_ITEM_DELETED events
 302     virtual void DeleteAllItems() = 0;
 303
 304         // expand this item
 305     virtual void Expand(const wxTreeItemId& item) = 0;
 306         // expand the item and all its children recursively
 307     void ExpandAllChildren(const wxTreeItemId& item);
 308         // expand all items
 309     void ExpandAll();
 310         // collapse the item without removing its children
 311     virtual void Collapse(const wxTreeItemId& item) = 0;
 312         // collapse the item and all its children
 313     void CollapseAllChildren(const wxTreeItemId& item);
 314         // collapse all items
 315     void CollapseAll();
 316         // collapse the item and remove all children
 317     virtual void CollapseAndReset(const wxTreeItemId& item) = 0;
 318         // toggles the current state
 319     virtual void Toggle(const wxTreeItemId& item) = 0;
 320
 321         // remove the selection from currently selected item (if any)
 322     virtual void Unselect() = 0;
 323         // unselect all items (only makes sense for multiple selection control)
 324     virtual void UnselectAll() = 0;
 325         // select this item
 326     virtual void SelectItem(const wxTreeItemId& item, bool select = true) = 0;
 327         // selects all (direct) children for given parent (only for
 328         // multiselection controls)
 329     virtual void SelectChildren(const wxTreeItemId& parent) = 0;
 330         // unselect this item
 331     void UnselectItem(const wxTreeItemId& item) { SelectItem(item, false); }
 332         // toggle item selection
 333     void ToggleItemSelection(const wxTreeItemId& item)
 334     {
 335         SelectItem(item, !IsSelected(item));
 336     }
 337
 338         // make sure this item is visible (expanding the parent item and/or
 339         // scrolling to this item if necessary)
 340     virtual void EnsureVisible(const wxTreeItemId& item) = 0;
 341         // scroll to this item (but don't expand its parent)
 342     virtual void ScrollTo(const wxTreeItemId& item) = 0;
 343
 344         // start editing the item label: this (temporarily) replaces the item
 345         // with a one line edit control. The item will be selected if it hadn't
 346         // been before. textCtrlClass parameter allows you to create an edit
 347         // control of arbitrary user-defined class deriving from wxTextCtrl.
 348     virtual wxTextCtrl *EditLabel(const wxTreeItemId& item,
 349                       wxClassInfo* textCtrlClass = CLASSINFO(wxTextCtrl)) = 0;
 350         // returns the same pointer as StartEdit() if the item is being edited,
 351         // NULL otherwise (it's assumed that no more than one item may be
 352         // edited simultaneously)
 353     virtual wxTextCtrl *GetEditControl() const = 0;
 354         // end editing and accept or discard the changes to item label
 355     virtual void EndEditLabel(const wxTreeItemId& item,
 356                               bool discardChanges = false) = 0;
 357
 358     // sorting
 359     // -------
 360
 361         // this function is called to compare 2 items and should return -1, 0
 362         // or +1 if the first item is less than, equal to or greater than the
 363         // second one. The base class version performs alphabetic comparaison
 364         // of item labels (GetText)
 365     virtual int OnCompareItems(const wxTreeItemId& item1,
 366                                const wxTreeItemId& item2)
 367     {
 368         return wxStrcmp(GetItemText(item1), GetItemText(item2));
 369     }
 370
 371         // sort the children of this item using OnCompareItems
 372         //
 373         // NB: this function is not reentrant and not MT-safe (FIXME)!
 374     virtual void SortChildren(const wxTreeItemId& item) = 0;
 375
 376     // items geometry
 377     // --------------
 378
 379         // determine to which item (if any) belongs the given point (the
 380         // coordinates specified are relative to the client area of tree ctrl)
 381         // and, in the second variant, fill the flags parameter with a bitmask
 382         // of wxTREE_HITTEST_xxx constants.
 383     wxTreeItemId HitTest(const wxPoint& point) const
 384         { int dummy; return DoTreeHitTest(point, dummy); }
 385     wxTreeItemId HitTest(const wxPoint& point, int& flags) const
 386         { return DoTreeHitTest(point, flags); }
 387
 388         // get the bounding rectangle of the item (or of its label only)
 389     virtual bool GetBoundingRect(const wxTreeItemId& item,
 390                                  wxRect& rect,
 391                                  bool textOnly = false) const = 0;
 392
 393
 394     // implementation
 395     // --------------
 396
 397     virtual bool ShouldInheritColours() const { return false; }
 398
 399     // hint whether to calculate best size quickly or accurately
 400     void SetQuickBestSize(bool q) { m_quickBestSize = q; }
 401     bool GetQuickBestSize() const { return m_quickBestSize; }
 402
 403 protected:
 404     virtual wxSize DoGetBestSize() const;
 405
 406     // common part of Get/SetItemState()
 407     virtual int DoGetItemState(const wxTreeItemId& item) const = 0;
 408     virtual void DoSetItemState(const wxTreeItemId& item, int state) = 0;
 409
 410     // common part of Append/Prepend/InsertItem()
 411     //
 412     // pos is the position at which to insert the item or (size_t)-1 to append
 413     // it to the end
 414     virtual wxTreeItemId DoInsertItem(const wxTreeItemId& parent,
 415                                       size_t pos,
 416                                       const wxString& text,
 417                                       int image, int selImage,
 418                                       wxTreeItemData *data) = 0;
 419
 420     // and this function implements overloaded InsertItem() taking wxTreeItemId
 421     // (it can't be called InsertItem() as we'd have virtual function hiding
 422     // problem in derived classes then)
 423     virtual wxTreeItemId DoInsertAfter(const wxTreeItemId& parent,
 424                                        const wxTreeItemId& idPrevious,
 425                                        const wxString& text,
 426                                        int image = -1, int selImage = -1,
 427                                        wxTreeItemData *data = NULL) = 0;
 428
 429     // real HitTest() implementation: again, can't be called just HitTest()
 430     // because it's overloaded and so the non-virtual overload would be hidden
 431     // (and can't be called DoHitTest() because this is already in wxWindow)
 432     virtual wxTreeItemId DoTreeHitTest(const wxPoint& point,
 433                                         int& flags) const = 0;
 434
 435
 436     wxImageList *m_imageListNormal, // images for tree elements
 437                 *m_imageListState;  // special images for app defined states
 438     bool         m_ownsImageListNormal,
 439                  m_ownsImageListState;
 440
 441     // spacing between left border and the text
 442     unsigned int m_spacing;
 443
 444     // whether full or quick calculation is done in DoGetBestSize
 445     bool        m_quickBestSize;
 446
 447
 448     wxDECLARE_NO_COPY_CLASS(wxTreeCtrlBase);
 449 };
 450
 451 // ----------------------------------------------------------------------------
 452 // include the platform-dependent wxTreeCtrl class
 453 // ----------------------------------------------------------------------------
 454
 455 #if defined(__WXUNIVERSAL__)
 456     #include "wx/generic/treectlg.h"
 457 #elif defined(__WXPALMOS__)
 458     #include "wx/generic/treectlg.h"
 459 #elif defined(__WXMSW__)
 460     #include "wx/msw/treectrl.h"
 461 #elif defined(__WXMOTIF__)
 462     #include "wx/generic/treectlg.h"
 463 #elif defined(__WXGTK__)
 464     #include "wx/generic/treectlg.h"
 465 #elif defined(__WXMAC__)
 466     #include "wx/generic/treectlg.h"
 467 #elif defined(__WXCOCOA__)
 468     #include "wx/generic/treectlg.h"
 469 #elif defined(__WXPM__)
 470     #include "wx/generic/treectlg.h"
 471 #endif
 472
 473 #endif // wxUSE_TREECTRL
 474
 475 #endif // _WX_TREECTRL_H_BASE_