GTree.h

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#ifndef __GTREE2_H
#define __GTREE2_H

#include "GList.h"

enum GTreeItemRect
{
    TreeItemPos,
    TreeItemThumb,
    TreeItemText,
    TreeItemIcon
};

class GTreeItem;

class LgiClass GTreeNode
{
protected:
    GTree *Tree;
    GTreeItem *Parent;
    List<GTreeItem> Items;

    virtual GTreeItem *Item() { return 0; }
    virtual GRect *Pos() { return 0; }

public:
    GTreeNode();
    virtual ~GTreeNode();

    GTreeItem *Insert(GTreeItem *Obj = NULL, int Pos = -1);
    void Remove();
    void Detach();
    GTreeItem *GetNext();
    GTreeItem *GetPrev();
    GTreeItem *GetChild();
    GTreeItem *GetParent() { return Parent; }
    GTree *GetTree() { return Tree; }
    bool IsRoot();
    int IndexOf();
};

class LgiClass GTreeItem : public GItem, public GTreeNode
{
    friend class GTree;
    friend class GTreeNode;

protected:
    class GTreeItemPrivate *d;

    // Private methods
    void _RePour();
    void _Pour(GdcPt2 *Limit, int Depth, bool Visible);
    void _Remove();
    void _MouseClick(GMouse &m);
    void _SetTreePtr(GTree *t);
    GTreeItem *_HitTest(int x, int y);
    GRect *_GetRect(GTreeItemRect Which);
    GdcPt2 _ScrollPos();
    GTreeItem *Item() { return this; }
    GRect *Pos();

    virtual void _PourText(GdcPt2 &Size);
    virtual void _PaintText(GSurface *pDC, COLOUR Fore, COLOUR Back);

protected:
    char *Str;
    int Sys_Image;

public:
    GTreeItem();
    virtual ~GTreeItem();

    char *GetText(int i=0);
    bool SetText(char *s, int i=0);
    int GetImage(int Flags = 0);
    void SetImage(int i);
    void Update();
    bool Select();
    void Select(bool b);
    bool Expanded();
    void Expanded(bool b);
    void ScrollTo();

    virtual void OnExpand(bool b) {}

    virtual void OnPaint(GSurface *pDC, GRect &r, COLOUR Back);
};

class LgiClass GTree :
    public GLayout,
    public ResObject,
    public GItemContainer,
    public GTreeNode
{
    friend class GTreeItem;
    friend class GTreeNode;

    class GTreePrivate *d;

    // Private methods
    void _Pour();
    void _OnSelect(GTreeItem *Item);
    GdcPt2 _ScrollPos();
    void _Update(GRect *r = 0, bool Now = false);
    void _UpdateBelow(int y, bool Now = false);
    void _UpdateScrollBars();

protected:
    // Options
    bool Lines;
    bool Buttons;
    bool LinesAtRoot;
    bool EditLabels;
    bool MultipleSelect;
    
    GTreeItem *GetAdjacent(GTreeItem *From, bool Down);
    
public:
    GTree(int id, int x, int y, int cx, int cy, char *name = 0);
    ~GTree();

    virtual void OnItemClick(GTreeItem *Item, GMouse &m);
    virtual void OnItemBeginDrag(GTreeItem *Item, int Flags);
    virtual void OnItemExpand(GTreeItem *Item, bool Expand);
    virtual void OnItemSelect(GTreeItem *Item);
    
    // Implementation
    void OnMouseClick(GMouse &m);
    void OnMouseMove(GMouse &m);
    void OnMouseWheel(double Lines);
    void OnPaint(GSurface *pDC);
    void OnFocus(bool b);
    void OnPosChange();
    bool OnKey(GKey &k);
    int OnNotify(GViewI *Ctrl, int Flags);
    int OnEvent(GMessage *Msg);

    GTreeItem *Insert(GTreeItem *Obj = 0, int Pos = -1);
    bool Delete(GTreeItem *Obj);
    bool Remove(GTreeItem *Obj);
    GTreeItem *ItemAt(int Pos) { return Items.ItemAt(Pos); }

    bool Select(GTreeItem *Obj);
    GTreeItem *Selection();
    GTreeItem *ItemAtPoint(int x, int y);
    void SelectDropTarget(GTreeItem *Item);

    void Empty();
    void RemoveAll();
};

#endif

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