treectrl.h

wxGTK 是 wxWidgets 的 linux GTK+ (>2.2.3)版本。wxWidgets 是一个跨平台的 GUI 框架

/////////////////////////////////////////////////////////////////////////////
// Name:        wx/gtk/treectrl.h
// Purpose:     wxTreeCtrl class
// Author:      Denis Pershin
// Modified by:
// Created:     08/08/98
// RCS-ID:      $Id: treectrl.h,v 1.23 2006/03/28 13:11:09 ABX Exp $
// Copyright:   (c) Denis Pershin
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_TREECTRL_H_
#define _WX_TREECTRL_H_

#include "wx/textctrl.h"
#include "wx/imaglist.h"

#include <gtk/gtk.h>

// the type for "untyped" data
typedef long wxDataType;

// fwd decl
class  WXDLLIMPEXP_CORE wxImageList;
struct wxTreeViewItem;

// a callback function used for sorting tree items, it should return -1 if the
// first item precedes the second, +1 if the second precedes the first or 0 if
// they're equivalent
class WXDLLIMPEXP_CORE wxTreeItemData;
typedef int (*wxTreeItemCmpFunc)(wxTreeItemData *item1, wxTreeItemData *item2);

// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------

// values for the `flags' parameter of wxTreeCtrl::HitTest() which determine
// where exactly the specified point is situated:
    // above the client area.
static const int wxTREE_HITTEST_ABOVE            = 0x0001;
    // below the client area.
static const int wxTREE_HITTEST_BELOW            = 0x0002;
    // in the client area but below the last item.
static const int wxTREE_HITTEST_NOWHERE          = 0x0004;
    // on the button associated with an item.
static const int wxTREE_HITTEST_ONITEMBUTTON     = 0x0010;
    // on the bitmap associated with an item.
static const int wxTREE_HITTEST_ONITEMICON       = 0x0020;
    // in the indentation associated with an item.
static const int wxTREE_HITTEST_ONITEMINDENT     = 0x0040;
    // on the label (string) associated with an item.
static const int wxTREE_HITTEST_ONITEMLABEL      = 0x0080;
    // in the area to the right of an item.
static const int wxTREE_HITTEST_ONITEMRIGHT      = 0x0100;
    // on the state icon for a tree view item that is in a user-defined state.
static const int wxTREE_HITTEST_ONITEMSTATEICON  = 0x0200;
    // to the right of the client area.
static const int wxTREE_HITTEST_TOLEFT           = 0x0400;
    // to the left of the client area.
static const int wxTREE_HITTEST_TORIGHT          = 0x0800;
    // anywhere on the item
static const int wxTREE_HITTEST_ONITEM  = wxTREE_HITTEST_ONITEMICON |
                                          wxTREE_HITTEST_ONITEMLABEL |
                                          wxTREE_HITTEST_ONITEMSTATEICON;

#if WXWIN_COMPATIBILITY_2_6
    // NB: all the following flags are for compatbility only and will be removed in
    //     next versions
    // flags for deprecated InsertItem() variant
    #define wxTREE_INSERT_FIRST 0xFFFF0001
    #define wxTREE_INSERT_LAST  0xFFFF0002
#endif

// ----------------------------------------------------------------------------
// wxTreeItemId identifies an element of the tree. In this implementation, it's
// just a trivial wrapper around GTK GtkTreeItem *. It's opaque for the
// application.
// ----------------------------------------------------------------------------
class WXDLLEXPORT wxTreeItemId {
public:
  // ctors
  wxTreeItemId() { m_itemId = NULL; }

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

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

  // conversion to/from either real (system-dependent) tree item id or
  // to "long" which used to be the type for tree item ids in previous
  // versions of wxWidgets

  // for wxTreeCtrl usage only
  wxTreeItemId(GtkTreeItem *itemId) { m_itemId = itemId; }
  operator GtkTreeItem *() const { return m_itemId; }
  void operator =(GtkTreeItem *item) { m_itemId = item; }

protected:
  GtkTreeItem *m_itemId;
};

// ----------------------------------------------------------------------------
// wxTreeItemData is some (arbitrary) user class associated with some item. The
// main advantage of having this class (compared to old untyped interface) is
// that wxTreeItemData's are destroyed automatically by the tree and, as this
// class has virtual dtor, it means that the memory will be automatically
// freed. OTOH, we don't just use wxObject instead of wxTreeItemData because
// the size of this class is critical: in any real application, each tree leaf
// will have wxTreeItemData associated with it and number of leaves may be
// quite big.
//
// Because the objects of this class are deleted by the tree, they should
// always be allocated on the heap!
// ----------------------------------------------------------------------------
class WXDLLEXPORT wxTreeItemData : private wxTreeItemId {
public:
    // default ctor/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() { }

    // accessors: set/get the item associated with this node
    void SetId(const wxTreeItemId& id) { m_itemId = id; }
    const wxTreeItemId& GetId() const { return (wxTreeItemId&) m_itemId; }
};

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 = "wxTreeCtrl")
    {
        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 = "wxTreeCtrl");

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

        // get the total number of items in the control
    virtual unsigned int 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);

        // 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. 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 the normal item image
    int GetItemImage(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);