wxWidgets/include/wx/generic/treectrl.h

/////////////////////////////////////////////////////////////////////////////
// Name:        treectrl.h
// Purpose:     wxTreeCtrl class
// Author:      Robert Roebling
// Modified by:
// Created:     01/02/97
// RCS-ID:      $Id$
// Copyright:   (c) 1997,1998 Robert Roebling
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

#ifndef _GENERIC_TREECTRL_H_
#define _GENERIC_TREECTRL_H_

#ifdef __GNUG__
    #pragma interface "treectrl.h"
#endif

#include "wx/defs.h"
#include "wx/string.h"
#include "wx/object.h"
#include "wx/event.h"
#include "wx/scrolwin.h"
#include "wx/textctrl.h"

// -----------------------------------------------------------------------------
// forward declaration
// -----------------------------------------------------------------------------

class wxImageList;
class wxGenericTreeItem;

class wxTreeItemData;
typedef int (*wxTreeItemCmpFunc)(wxTreeItemData *item1, wxTreeItemData *item2);

// -----------------------------------------------------------------------------
// wxTreeItemId - unique identifier of a tree element
// -----------------------------------------------------------------------------

class WXDLLEXPORT wxTreeItemId
{
friend class wxTreeCtrl;
friend class wxTreeEvent;
public:
    // ctors
        // 0 is invalid value for HTREEITEM
    wxTreeItemId() { m_pItem = 0; }

        // default copy ctor/assignment operator are ok for us

    // accessors
        // is this a valid tree item?
    bool IsOk() const { return m_pItem != 0; }

    // deprecated: only for compatibility
    wxTreeItemId(long itemId) { m_pItem = (wxGenericTreeItem *)itemId; }
    operator long() const { return (long)m_pItem; }

protected:
    // for wxTreeCtrl usage only
    wxTreeItemId(wxGenericTreeItem *pItem) { m_pItem = pItem; }
    
    wxGenericTreeItem *m_pItem;
};

// ----------------------------------------------------------------------------
// wxTreeItemData is some (arbitrary) user class associated with some item.
//
// Because the objects of this class are deleted by the tree, they should
// always be allocated on the heap!
// ----------------------------------------------------------------------------
class WXDLLEXPORT wxTreeItemData
{
friend class wxTreeCtrl;
public:
    // creation/destruction
    // --------------------
        // default ctor
    wxTreeItemData() { }

        // default copy ctor/assignment operator are ok

        // dtor is virtual and all the items are deleted by the tree control
        // when it's deleted, so you normally don't have to care about freeing
        // memory allocated in your wxTreeItemData-derived class
    virtual ~wxTreeItemData() { }

    // accessor: get the item associated with us
    const wxTreeItemId& GetId() const { return m_pItem; }
    void SetId(const wxTreeItemId& id) { m_pItem = id; }

protected:
    wxTreeItemId m_pItem;
};

// -----------------------------------------------------------------------------
// wxTreeEvent - the event generated by the tree control
// -----------------------------------------------------------------------------
class WXDLLEXPORT wxTreeEvent : public wxCommandEvent
{
friend class wxTreeCtrl;
public:
    wxTreeEvent(wxEventType commandType = wxEVT_NULL, int id = 0);

    // accessors
        // get the item on which the operation was performed or the newly
        // selected item for wxEVT_COMMAND_TREE_SEL_CHANGED/ING events
    wxTreeItemId GetItem() const { return m_item; }

        // for wxEVT_COMMAND_TREE_SEL_CHANGED/ING events, get the previously
        // selected item
    wxTreeItemId GetOldItem() const { return m_itemOld; }

        // the point where the mouse was when the drag operation started (for
        // wxEVT_COMMAND_TREE_BEGIN_(R)DRAG events only)
    wxPoint GetPoint() const { return m_pointDrag; }

        // keyboard code (for wxEVT_COMMAND_TREE_KEY_DOWN only)
    int GetCode() const { return m_code; }

    // set return code for wxEVT_COMMAND_TREE_ITEM_{EXPAND|COLLAPS}ING events
        // call this to forbid the change in item status
    void Veto() { m_code = TRUE; }

        // for implementation usage only
    bool WasVetoed() const { return m_code; }

private:
    // @@ we could save some space by using union here
    int           m_code;
    wxTreeItemId  m_item,
                  m_itemOld;
    wxPoint       m_pointDrag;

    DECLARE_DYNAMIC_CLASS(wxTreeEvent)
};

typedef void (wxEvtHandler::*wxTreeEventFunction)(wxTreeEvent&);

// ----------------------------------------------------------------------------
// macros for handling tree control events
// ----------------------------------------------------------------------------

// GetItem() returns the item being dragged, GetPoint() the mouse coords
#define EVT_TREE_BEGIN_DRAG(id, fn) { wxEVT_COMMAND_TREE_BEGIN_DRAG, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
#define EVT_TREE_BEGIN_RDRAG(id, fn) { wxEVT_COMMAND_TREE_BEGIN_RDRAG, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },

// GetItem() returns the itme whose label is being edited
#define EVT_TREE_BEGIN_LABEL_EDIT(id, fn) { wxEVT_COMMAND_TREE_BEGIN_LABEL_EDIT, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
#define EVT_TREE_END_LABEL_EDIT(id, fn) { wxEVT_COMMAND_TREE_END_LABEL_EDIT, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },

// provide/update information about GetItem() item
#define EVT_TREE_GET_INFO(id, fn) { wxEVT_COMMAND_TREE_GET_INFO, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
#define EVT_TREE_SET_INFO(id, fn) { wxEVT_COMMAND_TREE_SET_INFO, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },

// GetItem() is the item being expanded/collapsed, the "ING" versions can use 
#define EVT_TREE_ITEM_EXPANDED(id, fn) { wxEVT_COMMAND_TREE_ITEM_EXPANDED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
#define EVT_TREE_ITEM_EXPANDING(id, fn) { wxEVT_COMMAND_TREE_ITEM_EXPANDING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
#define EVT_TREE_ITEM_COLLAPSED(id, fn) { wxEVT_COMMAND_TREE_ITEM_COLLAPSED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },
#define EVT_TREE_ITEM_COLLAPSING(id, fn) { wxEVT_COMMAND_TREE_ITEM_COLLAPSING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },

// GetOldItem() is the item which had the selection previously, GetItem() is
// the item which acquires selection
#define EVT_TREE_SEL_CHANGED(id, fn) { wxEVT_COMMAND_TREE_SEL_CHANGED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },
#define EVT_TREE_SEL_CHANGING(id, fn) { wxEVT_COMMAND_TREE_SEL_CHANGING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },

// GetCode() returns the key code
// NB: this is the only message for which GetItem() is invalid (you may get the
//     item from GetSelection())
#define EVT_TREE_KEY_DOWN(id, fn) { wxEVT_COMMAND_TREE_KEY_DOWN, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, NULL },

// GetItem() returns the item being deleted, the associated data (if any) will
// be deleted just after the return of this event handler (if any)
#define EVT_TREE_DELETE_ITEM(id, fn) { wxEVT_COMMAND_TREE_DELETE_ITEM, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTreeEventFunction) & fn, (wxObject *) NULL },

// -----------------------------------------------------------------------------
// wxTreeCtrl - the tree control
// -----------------------------------------------------------------------------

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

    wxTreeCtrl(wxWindow *parent, wxWindowID id = -1,
               const wxPoint& pos = wxDefaultPosition,
               const wxSize& size = wxDefaultSize,
               long style = wxTR_HAS_BUTTONS | wxTR_LINES_AT_ROOT,
               const wxString& name = "wxTreeCtrl")
    {
        Create(parent, id, pos, size, style, name);
    }

    virtual ~wxTreeCtrl();

    bool Create(wxWindow *parent, wxWindowID id = -1,
                const wxPoint& pos = wxDefaultPosition,
                const wxSize& size = wxDefaultSize,
                long style = wxTR_HAS_BUTTONS | wxTR_LINES_AT_ROOT,
                const wxString& name = "wxTreeCtrl");

    // 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 { return m_indent; }
    void SetIndent(unsigned int indent);

        // 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.
    wxImageList *GetImageList() const;
    wxImageList *GetStateImageList() const;

    void SetImageList(wxImageList *imageList);
    void SetStateImageList(wxImageList *imageList);

    // Functions to work with tree ctrl items.

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

        // retrieve items label
    wxString GetItemText(const wxTreeItemId& item) const;
        // get the normal item image
    int GetItemImage(const wxTreeItemId& item) const;
        // get the selected item image
    int GetItemSelectedImage(const wxTreeItemId& item) const;
        // get the data associated with the item
    wxTreeItemData *GetItemData(const wxTreeItemId& item) const;

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

        // set items label
    void SetItemText(const wxTreeItemId& item, const wxString& text);
        // set the normal item image
    void SetItemImage(const wxTreeItemId& item, int image);
        // set the selected item image
    void SetItemSelectedImage(const wxTreeItemId& item, int image);
        // 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);

    // 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;

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

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

        // get the root tree item
    wxTreeItemId GetRootItem() const { return m_anchor; }

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

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

        // 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, long& cookie) const;
        // get the next child
    wxTreeItemId GetNextChild(const wxTreeItemId& item, long& cookie) 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
    wxTreeItemId AddRoot(const wxString& text,
                         int image = -1, int selectedImage = -1,
                         wxTreeItemData *data = NULL);

        // insert a new item in as the first child of the parent
    wxTreeItemId PrependItem(const wxTreeItemId& parent,
                             const wxString& text,
                             int image = -1, int selectedImage = -1,
                             wxTreeItemData *data = NULL);

        // insert a new item after a given one
    wxTreeItemId InsertItem(const wxTreeItemId& parent,
                            const wxTreeItemId& idPrevious,
                            const wxString& text,
                            int image = -1, int selectedImage = -1,
                            wxTreeItemData *data = NULL);

        // insert a new item in as the last child of the parent
    wxTreeItemId AppendItem(const wxTreeItemId& parent,
                            const wxString& text,
                            int image = -1, int selectedImage = -1,
                            wxTreeItemData *data = NULL);

        // delete this item and associated data if any
    void Delete(const wxTreeItemId& item);
        // delete all items from the tree
    void DeleteAllItems();

        // expand this item
    void Expand(const wxTreeItemId& item);
        // collapse the item without removing its children
    void Collapse(const wxTreeItemId& item);
        // collapse the item and remove all children
    void CollapseAndReset(const wxTreeItemId& item);
        // toggles the current state
    void Toggle(const wxTreeItemId& item);

        // remove the selection from currently selected item (if any)
    void Unselect();
        // select this item
    void SelectItem(const wxTreeItemId& item);
        // make sure this item is visible (expanding the parent item and/or
        // scrolling to this item if necessary)
    void EnsureVisible(const wxTreeItemId& item);
        // scroll to this item (but don't expand its parent)
    void ScrollTo(const wxTreeItemId& item);

        // start editing the item label: this (temporarily) replaces the item
        // with a one line edit control. The item will be selected if it hadn't
        // been before. textCtrlClass parameter allows you to create an edit
        // control of arbitrary user-defined class deriving from wxTextCtrl.
    wxTextCtrl* EditLabel(const wxTreeItemId& item,
                          wxClassInfo* textCtrlClass = CLASSINFO(wxTextCtrl));
        // returns the same pointer as StartEdit() if the item is being edited,
        // NULL otherwise (it's assumed that no more than one item may be
        // edited simultaneously)
    wxTextCtrl* GetEditControl() const;
        // end editing and accept or discard the changes to item label
    void EndEditLabel(const wxTreeItemId& item, bool discardChanges = FALSE);

        // sort the children of this item using the specified callback function
        // (it should return -1, 0 or +1 as usual), if it's not specified
        // alphabetical comparaison is performed.
        //
        // NB: this function is not reentrant!
    void SortChildren(const wxTreeItemId& item,
                      wxTreeItemCmpFunc *cmpFunction = NULL);

    // implementation
    // --------------
        // wxWindows callbacks
    void OnPaint( const wxPaintEvent &event );
    void OnSetFocus( const wxFocusEvent &event );
    void OnKillFocus( const wxFocusEvent &event );
    void OnChar( wxKeyEvent &event );
    void OnMouse( const wxMouseEvent &event );

protected:
    wxGenericTreeItem   *m_anchor;
    wxGenericTreeItem   *m_current;
    bool                 m_hasFocus;
    int                  m_xScroll,m_yScroll;
    unsigned int         m_indent;
    int                  m_lineHeight;
    wxPen                m_dottedPen;
    wxBrush             *m_hilightBrush;
    wxImageList         *m_imageListNormal,
                        *m_imageListState;

    // the common part of all ctors
    void Init();

    // misc helpers
    wxTreeItemId DoInsertItem(const wxTreeItemId& parent,
                              size_t previous,
                              const wxString& text,
                              int image, int selectedImage,
                              wxTreeItemData *data);

    void AdjustMyScrollbars();
    void PaintLevel( wxGenericTreeItem *item, wxDC &dc, int level, int &y );

    void CalculateLevel( wxGenericTreeItem *item, wxDC &dc, int level, int &y );
    void CalculatePositions();

    void RefreshSubtree( wxGenericTreeItem *item );
    void RefreshLine( wxGenericTreeItem *item );

private:
    DECLARE_EVENT_TABLE()
    DECLARE_DYNAMIC_CLASS(wxTreeCtrl)
};

#endif // _GENERIC_TREECTRL_H_