unit DXWListBoxUnit;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  DXClass, DXDraws ,DXWStatObj,DXWScrollUnit;

Type


TDXWListBox = class(TDXWObject)
 private
     FImage        : TPictureCollectionItem;
     FSurface      : TDirectDrawSurface;
     FStrings      : TStringList;
     FLineTop      : integer;
     FLineTopMax   : integer;
     FTextOffSet   : byte;
     TxtRect       : TRect;
     FLineHeight   : integer;
     FFocusedLineId: integer;
     FItemIndex    : integer;
     FFocusedLine  : string;
     FSorted       : Boolean;
     FHighLightedColor : TColor;
     FSelectedColor    : TColor;
     FScrollBar        : TDXWScroll;

     procedure SetSurface(Value: TDirectDrawSurface);
     Function  MousePosToLineId(X,Y : integer):integer;
     Function  BottomLine :integer;
     Function  GetLineUnderCursor(X,Y : integer):string;
     Procedure SetLineTop(Value : integer );
     Procedure SetItemIndex(Value : integer );
     Procedure SetStrings(Value: TStringList);
     Procedure SetSorted(Value : Boolean );
     Procedure SetFocusedLineId(Value : Integer);
     procedure SetImage(const Value: TPictureCollectionItem);
     procedure SetScrollBar(const Value: TDXWScroll);
Protected
     Procedure DoDraw;override;
     function  GetDrawImageIndex: Integer;virtual;
     procedure SetBounds;override;

     Procedure MouseUp(Button: TMouseButton;Shift:TShiftState;X,Y:Integer);override;
     Procedure MouseDown(Button: TMouseButton;Shift:TShiftState;X,Y:Integer);override;
     Procedure MouseMove(Shift:TShiftState;X,Y:Integer);override;

     Procedure KeyDown(var Key: Word; Shift: TShiftState);override;
     Procedure KeyUp(var Key: Word; Shift: TShiftState);override;
     Procedure KeyPress(var Key : char);override;

     Procedure StringsChanged(Sender : TObject);
     Procedure FontChenged(Sender: TObject);override;
     Procedure ScrollChanged(Sender : TObject);

 Public
     Constructor Create(AOwner : TObject);override ;
     Destructor  Destroy; override;
     Function  LinesShow : integer;

     property Image : TPictureCollectionItem read FImage write SetImage;
     property Surface : TDirectDrawSurface read FSurface write SetSurface;
     property LineTop    :integer read FLineTop write SetLineTop default 0;
     property LineTopMax :integer read FLineTopMax;
     property FocusedLine   : string  read FFocusedLine ;
     property FocusedLineId : integer read FFocusedLineId write SetFocusedLineId;
     property TextOffset : byte read FTextOffset write FTextOffset;
     property Strings : TStringList read  FStrings  write  SetStrings;
     property ItemIndex : integer read FItemIndex write SetItemIndex;
     property LineHeight: integer read FLineHeight write FLineHeight;
     property HighLightedColor : TColor read FHighLightedColor write FHighLightedColor;
     property SelectedColor    : TColor read FSelectedColor write FSelectedColor;
     property Sorted : Boolean read FSorted write SetSorted;
     property ScrollBar : TDXWScroll read  FScrollBar write SetScrollBar;

end;

implementation

Uses Pathes;

Constructor TDXWListBox.Create(AOwner : TObject);
begin
inherited Create(AOwner);

FLineTop   :=0;
FFocusedLineId:=-1;
FItemIndex:=-1;
FFocusedLine:='';
Font.Name:='Times New Roman';
Font.Charset:=RUSSIAN_CHARSET;
Font.Style:=[fsBold];
Font.Size :=10;
FTextOffset :=10;

FHighLightedColor:=clWhite;
FSelectedColor    :=clRed;

FStrings:=TStringList.Create;
FStrings.Sorted:=FSorted;
FStrings.OnChange:=StringsChanged;
end;

procedure TDXWListBox.DoDraw;
Var
i             : integer;
LineOutCounter: integer;
CurrentLine   : String;
CurrentLineId : Integer;
ImageIndex    : Integer;
begin
if not Visible then Exit;

TxtRect:=Bounds(Left+FTextOffset,Top+FTextOffset,Width-FTextOffset*2,Height-FTextOffset*2);
ImageIndex := GetDrawImageIndex;
Image.Draw( FSurface, Left, Top, ImageIndex);

with FSurface.Canvas do
 begin
  Font.Assign(Self.Font);
  Brush.Style := bsClear;

  For LineOutCounter:=0 to LinesShow-1 do
  begin
   CurrentLineId:=FLineTop+LineOutCounter;
   CurrentLine:=Strings[CurrentLineId];

   Font.Color:=Self.Font.Color;
   if CurrentLineId=FItemIndex then
    Font.Color:=FSelectedColor
   else
   if (CurrentLineId=FFocusedLineId) and
      (MouseInControl) then
    Font.Color:=FHighLightedColor;

   TextRect(TxtRect,TxtRect.Left,TxtRect.Top+LineOutCounter*LineHeight,CurrentLine) ;
  end;

  Release;

 end;

end;


Destructor  TDXWListBox.Destroy;
Var
i: integer;
begin
FStrings.Free;
inherited Destroy;
end;

Procedure TDXWListBox.MouseUp(Button: TMouseButton;Shift:TShiftState;X,Y:Integer);
begin
 inherited MouseUp(Button,Shift,X,Y);
end;

Procedure TDXWListBox.MouseDown(Button: TMouseButton;Shift:TShiftState;X,Y:Integer);
begin
 inherited MouseDown(Button,Shift,X,Y);
 FItemIndex:=FFocusedLineId;
end;

Procedure TDXWListBox.MouseMove(Shift:TShiftState;X,Y:Integer);
Var
 LN:integer;
begin
 inherited MouseMove(Shift,X,Y);

 LN:=MousePosToLineId(X,Y);
 FFocusedLineId:=LN;
 if (ssLeft in Shift) and (FFocusedLineId>=0)
  then FItemIndex:=LN;

end;

Procedure TDXWListBox.SetFocusedLineId(Value : Integer);
begin
If(Value<>-1)and
  (Value<>FFocusedLineId)
  then FFocusedLineId:=Value;
end;

Procedure TDXWListBox.SetItemIndex(Value : Integer);
begin
If(Value<>-1)and
  (Value<>FItemIndex)
  then FItemIndex:=Value;
end;


Function TDXWListBox.MousePosToLineId(X,Y : integer):integer;
Var
LineOutCounter:integer;
begin
Result:=-1;
if Not PtInRect(TxtRect,Point(X,Y))then Exit;
LineOutCounter:=(Y - TxtRect.Top) div LineHeight;
Result:=FLineTop+LineOutCounter;
if Result > BottomLine then Result:=-1;
end;

Function TDXWListBox.GetLineUnderCursor(X,Y : integer):string;
Var
CurrentLine:String;
CurrentLineId:Integer;
begin
Result:='';
CurrentLineId:=MousePosToLineId(X,Y);
if CurrentLineId=-1 then Exit;
CurrentLine:=Strings[CurrentLineId];
Result:=CurrentLine;
end;

Function  TDXWListBox.LinesShow : integer;
begin
result :=( Height-FTextOffset*2 ) Div LineHeight;
if result>Strings.Count
 then result:=Strings.Count;
end;

Function TDXWListBox.BottomLine :integer;
begin
 result :=Strings.Count-1;
end;

Procedure TDXWListBox.SetLineTop(Value : integer );
begin

 if(Value<>FLineTop)and
   (Value<=FLineTopMax) and
   (Value>=0) then
    begin
     FLineTop := Value;
     if Assigned(FScrollBar)
      then FScrollBar.Position:=FLineTop;
    end;

end;

Procedure TDXWListBox.SetStrings(Value : TStringList );
begin
 FStrings.Assign(Value);
end;

Procedure TDXWListBox.StringsChanged(Sender : TObject);
Begin
FItemIndex:=-1;
FLineTop:=0;
FLineTopMax:=(BottomLine-LinesShow+1);
end;


Procedure TDXWListBox.SetSorted(Value : Boolean );
begin
FSorted:=Value;
FStrings.Sorted:=FSorted;
end;

function TDXWListBox.GetDrawImageIndex: Integer;
begin
//if Down then Result :=1 else Result :=0;
Result :=0;
end;


procedure TDXWListBox.SetSurface(Value: TDirectDrawSurface);
begin
 FSurface := Value;

 with FSurface.Canvas do
 begin
  LineHeight:=TextHeight('A');
  Release;
 end;

end;


procedure TDXWListBox.FontChenged(Sender: TObject);
begin
{
 inherited FontChenged(Sender);

 if FSurface=nil then Exit;
 with Surface.Canvas do
 begin
  LineHeight:=TextHeight('A');
  Release;
 end;
}
end;

procedure TDXWListBox.KeyDown(var Key: Word; Shift: TShiftState);
begin

Case key of
 vk_Up   : LineTop:=LineTop-1;
 vk_Down : LineTop:=LineTop+1;
end;

  inherited;
end;

procedure TDXWListBox.KeyPress(var Key: char);
begin
  inherited;

end;

procedure TDXWListBox.KeyUp(var Key: Word; Shift: TShiftState);
begin
  inherited;

end;

procedure TDXWListBox.SetBounds;
begin
  inherited;
end;

procedure TDXWListBox.SetImage(const Value: TPictureCollectionItem);
begin
  FImage := Value;
  Width:=Value.Width;
  Height:=Value.Height;
end;

procedure TDXWListBox.SetScrollBar(const Value: TDXWScroll);
begin
  FScrollBar := Value;
  FScrollBar.OnChange:=ScrollChanged;
  FScrollBar.Max:=FLineTopMax;
end;

procedure TDXWListBox.ScrollChanged(Sender: TObject);
begin
  LineTop:=FScrollBar.Position;
end;

end.