treectrl.h

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/////////////////////////////////////////////////////////////////////////////
// Name:        wx/msw/treectrl.h
// Purpose:     wxTreeCtrl class
// Author:      Julian Smart
// Modified by: Vadim Zeitlin to be less MSW-specific on 10/10/98
// Created:     01/02/97
// RCS-ID:      $Id: treectrl.h,v 1.74.2.2 2006/01/18 16:32:42 JS Exp $
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_TREECTRL_H_
#define _WX_TREECTRL_H_

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
    #pragma interface "treectrl.h"
#endif

#if wxUSE_TREECTRL

#include "wx/textctrl.h"
#include "wx/dynarray.h"
#include "wx/treebase.h"
#include "wx/hashmap.h"

#ifdef __GNUWIN32__
    // Cygwin windows.h defines these identifiers
    #undef GetFirstChild
    #undef GetNextSibling
#endif // Cygwin

// fwd decl
class  WXDLLEXPORT wxImageList;
class  WXDLLEXPORT wxDragImage;
struct WXDLLEXPORT wxTreeViewItem;

// NB: all the following flags are for compatbility only and will be removed in the
//     next versions

// flags for deprecated InsertItem() variant (their values are the same as of
// TVI_FIRST and TVI_LAST)
#define wxTREE_INSERT_FIRST 0xFFFF0001
#define wxTREE_INSERT_LAST  0xFFFF0002

// hash storing attributes for our items
WX_DECLARE_EXPORTED_VOIDPTR_HASH_MAP(wxTreeItemAttr *, wxMapTreeAttr);

// ----------------------------------------------------------------------------
// wxTreeCtrl
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxTreeCtrl : public wxControl
{
public:
    // creation
    // --------
    wxTreeCtrl() { Init(); }

    wxTreeCtrl(wxWindow *parent, wxWindowID id = wxID_ANY,
               const wxPoint& pos = wxDefaultPosition,
               const wxSize& size = wxDefaultSize,
               long style = wxTR_HAS_BUTTONS | wxTR_LINES_AT_ROOT,
               const wxValidator& validator = wxDefaultValidator,
               const wxString& name = wxTreeCtrlNameStr)
    {
        Create(parent, id, pos, size, style, validator, name);
    }

    virtual ~wxTreeCtrl();

    bool Create(wxWindow *parent, wxWindowID id = wxID_ANY,
                const wxPoint& pos = wxDefaultPosition,
                const wxSize& size = wxDefaultSize,
                long style = wxTR_HAS_BUTTONS | wxTR_LINES_AT_ROOT,
                const wxValidator& validator = wxDefaultValidator,
                const wxString& name = wxTreeCtrlNameStr);

    // accessors
    // ---------

        // get the total number of items in the control
    size_t GetCount() const;

        // indent is the number of pixels the children are indented relative to
        // the parents position. SetIndent() also redraws the control
        // immediately.
    unsigned int GetIndent() const;
    void SetIndent(unsigned int indent);

    // spacing is the number of pixels between the start and the Text
        // not implemented under wxMSW
    unsigned int GetSpacing() const { return 18; } // return wxGTK default
    void SetSpacing(unsigned int WXUNUSED(spacing)) { }

        // image list: these functions allow to associate an image list with
        // the control and retrieve it. Note that the control does _not_ delete
        // the associated image list when it's deleted in order to allow image
        // lists to be shared between different controls.
        //
        // The normal image list is for the icons which correspond to the
        // normal tree item state (whether it is selected or not).
        // Additionally, the application might choose to show a state icon
        // which corresponds to an app-defined item state (for example,
        // checked/unchecked) which are taken from the state image list.
    virtual wxImageList *GetImageList() const;
    virtual wxImageList *GetStateImageList() const;

    virtual void SetImageList(wxImageList *imageList);
    virtual void SetStateImageList(wxImageList *imageList);
    virtual void AssignImageList(wxImageList *imageList);
    virtual void AssignStateImageList(wxImageList *imageList);

    // Functions to work with tree ctrl items. Unfortunately, they can _not_ be
    // member functions of wxTreeItem because they must know the tree the item
    // belongs to for Windows implementation and storing the pointer to
    // wxTreeCtrl in each wxTreeItem is just too much waste.

    // accessors
    // ---------

        // retrieve items label
    wxString GetItemText(const wxTreeItemId& item) const;
        // get one of the images associated with the item (normal by default)
    virtual int GetItemImage(const wxTreeItemId& item,
                     wxTreeItemIcon which = wxTreeItemIcon_Normal) const;
        // get the data associated with the item
    wxTreeItemData *GetItemData(const wxTreeItemId& item) const;

        // get the item's text colour
    wxColour GetItemTextColour(const wxTreeItemId& item) const;

        // get the item's background colour
    wxColour GetItemBackgroundColour(const wxTreeItemId& item) const;

        // get the item's font
    wxFont GetItemFont(const wxTreeItemId& item) const;

    // modifiers
    // ---------

        // set items label
    void SetItemText(const wxTreeItemId& item, const wxString& text);
        // get one of the images associated with the item (normal by default)
    virtual void SetItemImage(const wxTreeItemId& item, int image,
                      wxTreeItemIcon which = wxTreeItemIcon_Normal);
        // associate some data with the item
    void SetItemData(const wxTreeItemId& item, wxTreeItemData *data);

        // force appearance of [+] button near the item. This is useful to
        // allow the user to expand the items which don't have any children now
        // - but instead add them only when needed, thus minimizing memory
        // usage and loading time.
    void SetItemHasChildren(const wxTreeItemId& item, bool has = true);

        // the item will be shown in bold
    void SetItemBold(const wxTreeItemId& item, bool bold = true);

        // the item will be shown with a drop highlight
    void SetItemDropHighlight(const wxTreeItemId& item, bool highlight = true);

        // set the items text colour
    void SetItemTextColour(const wxTreeItemId& item, const wxColour& col);

        // set the items background colour
    void SetItemBackgroundColour(const wxTreeItemId& item, const wxColour& col);

        // set the items font (should be of the same height for all items)
    void SetItemFont(const wxTreeItemId& item, const wxFont& font);

    // item status inquiries
    // ---------------------

        // is the item visible (it might be outside the view or not expanded)?
    bool IsVisible(const wxTreeItemId& item) const;
        // does the item has any children?
    bool ItemHasChildren(const wxTreeItemId& item) const;
        // is the item expanded (only makes sense if HasChildren())?
    bool IsExpanded(const wxTreeItemId& item) const;
        // is this item currently selected (the same as has focus)?
    bool IsSelected(const wxTreeItemId& item) const;
        // is item text in bold font?
    bool IsBold(const wxTreeItemId& item) const;

    // number of children
    // ------------------

        // if 'recursively' is false, only immediate children count, otherwise
        // the returned number is the number of all items in this branch
    size_t GetChildrenCount(const wxTreeItemId& item,
                            bool recursively = true) const;

    // navigation
    // ----------

    // wxTreeItemId.IsOk() will return false if there is no such item

        // get the root tree item
    wxTreeItemId GetRootItem() const;

        // get the item currently selected (may return NULL if no selection)
    wxTreeItemId GetSelection() const;

        // get the items currently selected, return the number of such item
        //
        // NB: this operation is expensive and can take a long time for a
        //     control with a lot of items (~ O(number of items)).
    size_t GetSelections(wxArrayTreeItemIds& selections) const;

        // get the parent of this item (may return NULL if root)
    wxTreeItemId GetItemParent(const wxTreeItemId& item) const;

#if WXWIN_COMPATIBILITY_2_2
        // deprecated:  Use GetItemParent instead.
    wxDEPRECATED( wxTreeItemId GetParent(const wxTreeItemId& item) const);

        // Expose the base class method hidden by the one above. Not deprecatable.
    wxWindow *GetParent() const { return wxControl::GetParent(); }
#endif  // WXWIN_COMPATIBILITY_2_2

        // for this enumeration function you must pass in a "cookie" parameter
        // which is opaque for the application but is necessary for the library
        // to make these functions reentrant (i.e. allow more than one
        // enumeration on one and the same object simultaneously). Of course,
        // the "cookie" passed to GetFirstChild() and GetNextChild() should be
        // the same!

        // get the first child of this item
    wxTreeItemId GetFirstChild(const wxTreeItemId& item,
                               wxTreeItemIdValue& cookie) const;
        // get the next child
    wxTreeItemId GetNextChild(const wxTreeItemId& item,
                              wxTreeItemIdValue& cookie) const;
        // get the last child of this item - this method doesn't use cookies
    wxTreeItemId GetLastChild(const wxTreeItemId& item) const;

        // get the next sibling of this item
    wxTreeItemId GetNextSibling(const wxTreeItemId& item) const;
        // get the previous sibling
    wxTreeItemId GetPrevSibling(const wxTreeItemId& item) const;

        // get first visible item
    wxTreeItemId GetFirstVisibleItem() const;
        // get the next visible item: item must be visible itself!
        // see IsVisible() and wxTreeCtrl::GetFirstVisibleItem()
    wxTreeItemId GetNextVisible(const wxTreeItemId& item) const;
        // get the previous visible item: item must be visible itself!
    wxTreeItemId GetPrevVisible(const wxTreeItemId& item) const;

    // operations
    // ----------

        // add the root node to the tree
    virtual wxTreeItemId AddRoot(const wxString& text,
                         int image = -1, int selectedImage = -1,