m_TrackBar.Top := m_Btn2.Height;
            m_TrackBar.Height := Height - m_Btn1.Height - m_Btn2.Height - 1;
            m_TrackBar.Left := 0;
            m_Btn1.Top := Height - m_Btn1.Height;
            m_Btn1.Left := 0;
            Width := m_Btn2.Width;
        end
        else
        begin
            m_Btn2.Left := 0;
            m_Btn2.Top := 0;
            m_TrackBar.Left := m_Btn2.Width;
            m_TrackBar.Width := Width - m_Btn1.Width - m_Btn2.Width;
            m_TrackBar.Top := 0;
            m_Btn1.Left := Width - m_Btn1.Width;
            m_Btn1.Top := 0;
            Height := m_Btn2.Height;
        end;
        UpdateSliderPic();
    end;
end;

procedure TsuiScrollBar.Resize;
begin
    inherited;

    PlaceTrackBarAndButton();
end;

procedure TsuiScrollBar.SetFileTheme(const Value: TsuiFileTheme);
begin
    m_FileTheme := Value;
    SetUIStyle(m_UIStyle);
end;

procedure TsuiScrollBar.SetLargeChange(const Value: TScrollBarInc);
begin
    m_TrackBar.PageSize := Value;
end;

procedure TsuiScrollBar.SetLineButton(const Value: Integer);
begin
    if m_LineButton = Value then
        Exit;

    if m_Orientation = suiVertical then
    begin
        if Value > Height - m_Btn1.Height - m_Btn2.Height then
            Exit;
    end
    else
    begin
        if Value > Width - m_Btn1.Width - m_Btn2.Width then
            Exit;
    end;

    m_LineButton := Value;
    UpdateSliderPic();
end;

procedure TsuiScrollBar.SetMax(const Value: Integer);
begin
    m_TrackBar.Max := Value;
end;

procedure TsuiScrollBar.SetMin(const Value: Integer);
begin
    m_TrackBar.Min := Value;
end;

procedure TsuiScrollBar.SetOnChange(const Value: TNotifyEvent);
begin
    m_TrackBar.OnChange := Value;
end;

procedure TsuiScrollBar.SetOrientation(const Value: TsuiProgressBarOrientation);
begin
    if m_Orientation = Value then
        Exit;

    m_Orientation := Value;
    UpdatePictures();

    PlaceTrackBarAndButton();
end;

procedure TsuiScrollBar.SetPageSize(const Value: Integer);
begin
    m_TrackBar.PageSize := Value;
    UpdateSliderPic();
end;

procedure TsuiScrollBar.SetPosition(const Value: Integer);
begin
    if m_TrackBar.Position = Value then
        Exit;
    m_TrackBar.Position := Value;
end;

procedure TsuiScrollBar.SetSliderVisible(const Value: Boolean);
begin
    if m_TrackBar.SliderVisible <> Value then
        m_TrackBar.SliderVisible := Value;
end;

procedure TsuiScrollBar.SetUIStyle(const Value: TsuiUIStyle);
begin
    m_UIStyle := Value;

    m_TrackBar.Color := Color;
    UpdatePictures();
    PlaceTrackBarAndButton();
end;

procedure TsuiScrollBar.UpdatePictures;
var
    OutUIStyle : TsuiUIStyle;
    TempBmp : TBitmap;
begin
    m_TrackBar.BarImage := nil;
    TempBmp := TBitmap.Create();

    if UsingFileTheme(m_FileTheme, m_UIStyle, OutUIStyle) then
    begin
        Color := m_FileTheme.GetColor(SUI_THEME_SCROLLBAR_BACKGROUND_COLOR);
        m_FileTheme.GetBitmap(SUI_THEME_SCROLLBAR_SLIDER_IMAGE, m_SliderLeft, 3, 1);
        m_FileTheme.GetBitmap(SUI_THEME_SCROLLBAR_SLIDER_IMAGE, m_SliderCenter, 3, 2);
        m_FileTheme.GetBitmap(SUI_THEME_SCROLLBAR_SLIDER_IMAGE, m_SliderRight, 3, 3);

        m_FileTheme.GetBitmap(SUI_THEME_SCROLLBAR_BUTTON_IMAGE, TempBmp, 6, 1);
        if m_Orientation = suiHorizontal then
            RoundPicture(TempBmp);
        m_Btn2.PicNormal.Bitmap.Assign(TempBmp);
        m_FileTheme.GetBitmap(SUI_THEME_SCROLLBAR_BUTTON_IMAGE, TempBmp, 6, 2);
        if m_Orientation = suiHorizontal then
            RoundPicture(TempBmp);
        m_Btn2.PicMouseOn.Bitmap.Assign(TempBmp);
        m_FileTheme.GetBitmap(SUI_THEME_SCROLLBAR_BUTTON_IMAGE, TempBmp, 6, 3);
        if m_Orientation = suiHorizontal then
            RoundPicture(TempBmp);
        m_Btn2.PicMouseDown.Bitmap.Assign(TempBmp);
        m_FileTheme.GetBitmap(SUI_THEME_SCROLLBAR_BUTTON_IMAGE, TempBmp, 6, 4);
        if m_Orientation = suiHorizontal then
            RoundPicture(TempBmp);
        m_Btn1.PicNormal.Bitmap.Assign(TempBmp);
        m_FileTheme.GetBitmap(SUI_THEME_SCROLLBAR_BUTTON_IMAGE, TempBmp, 6, 5);
        if m_Orientation = suiHorizontal then
            RoundPicture(TempBmp);
        m_Btn1.PicMouseOn.Bitmap.Assign(TempBmp);
        m_FileTheme.GetBitmap(SUI_THEME_SCROLLBAR_BUTTON_IMAGE, TempBmp, 6, 6);
        if m_Orientation = suiHorizontal then
            RoundPicture(TempBmp);
        m_Btn1.PicMouseDown.Bitmap.Assign(TempBmp);
    end
    else
    begin
        Color := GetInsideThemeColor(OutUIStyle, SUI_THEME_SCROLLBAR_BACKGROUND_COLOR);
        GetInsideThemeBitmap(OutUIStyle, SUI_THEME_SCROLLBAR_SLIDER_IMAGE, m_SliderLeft, 3, 1);
        GetInsideThemeBitmap(OutUIStyle, SUI_THEME_SCROLLBAR_SLIDER_IMAGE, m_SliderCenter, 3, 2);
        GetInsideThemeBitmap(OutUIStyle, SUI_THEME_SCROLLBAR_SLIDER_IMAGE, m_SliderRight, 3, 3);

        GetInsideThemeBitmap(OutUIStyle, SUI_THEME_SCROLLBAR_BUTTON_IMAGE, TempBmp, 6, 1);
        if m_Orientation = suiHorizontal then
            RoundPicture(TempBmp);
        m_Btn2.PicNormal.Bitmap.Assign(TempBmp);
        GetInsideThemeBitmap(OutUIStyle, SUI_THEME_SCROLLBAR_BUTTON_IMAGE, TempBmp, 6, 2);
        if m_Orientation = suiHorizontal then
            RoundPicture(TempBmp);
        m_Btn2.PicMouseOn.Bitmap.Assign(TempBmp);
        GetInsideThemeBitmap(OutUIStyle, SUI_THEME_SCROLLBAR_BUTTON_IMAGE, TempBmp, 6, 3);
        if m_Orientation = suiHorizontal then
            RoundPicture(TempBmp);
        m_Btn2.PicMouseDown.Bitmap.Assign(TempBmp);
        GetInsideThemeBitmap(OutUIStyle, SUI_THEME_SCROLLBAR_BUTTON_IMAGE, TempBmp, 6, 4);
        if m_Orientation = suiHorizontal then
            RoundPicture(TempBmp);
        m_Btn1.PicNormal.Bitmap.Assign(TempBmp);
        GetInsideThemeBitmap(OutUIStyle, SUI_THEME_SCROLLBAR_BUTTON_IMAGE, TempBmp, 6, 5);
        if m_Orientation = suiHorizontal then
            RoundPicture(TempBmp);
        m_Btn1.PicMouseOn.Bitmap.Assign(TempBmp);
        GetInsideThemeBitmap(OutUIStyle, SUI_THEME_SCROLLBAR_BUTTON_IMAGE, TempBmp, 6, 6);
        if m_Orientation = suiHorizontal then
            RoundPicture(TempBmp);
        m_Btn1.PicMouseDown.Bitmap.Assign(TempBmp);
    end;

    TempBmp.Free();

    if m_Orientation = suiVertical then
    begin
        RoundPicture3(m_SliderLeft);
        RoundPicture3(m_SliderCenter);
        RoundPicture3(m_SliderRight);
    end;

    m_Btn1.AutoSize := true;
    m_Btn2.AutoSize := true;
    Repaint();
end;

procedure TsuiScrollBar.UpdateSliderPic;
var
    Buf : TBitmap;
    TempPageSize : Integer;
    R : TRect;
begin
    Buf := TBitmap.Create();

    if m_Orientation = suiVertical then
        Buf.Width := m_SliderLeft.Width
    else
        Buf.Height := m_SliderLeft.Height;

    if m_LineButton <= 0 then
    begin
        TempPageSize := PageSize;
        if (TempPageSize < 10) or (TempPageSize > 100) then
            TempPageSize := 10;

        if m_Orientation = suiVertical then
        begin
            if m_TrackBar.Height > 0 then
                Buf.Height := (TempPageSize * m_TrackBar.Height div 100)
        end
        else
        begin
            if m_TrackBar.Width > 0 then
                Buf.Width := (TempPageSize * m_TrackBar.Width div 100)
        end;
    end
    else
    begin
        if m_LineButton < 18 then
            m_LineButton := 18;
        if m_Orientation = suiVertical then
            Buf.Height := m_LineButton
        else
            Buf.Width := m_LineButton;
    end;

    Buf.Canvas.Draw(0, 0, m_SliderLeft);
    if m_Orientation = suiVertical then
    begin
        R := Rect(0, m_SliderLeft.Height, Buf.Width, Buf.Height - m_SliderRight.Height);
        Buf.Canvas.Draw(0, R.Bottom, m_SliderRight);
    end
    else
    begin
        R := Rect(m_SliderLeft.Width, 0, Buf.Width - m_SliderRight.Width, Buf.Height);
        Buf.Canvas.Draw(R.Right, 0, m_SliderRight);
    end;
    Buf.Canvas.StretchDraw(R, m_SliderCenter);

    m_TrackBar.SliderImage.Bitmap.Assign(Buf);
    m_TrackBar.UpdateSliderSize();

    Buf.Free();
end;

procedure TsuiScrollBar.WMERASEBKGND(var Msg: TMessage);
begin
    // do nothing
end;

procedure TsuiScrollBar.WMSIZE(var Msg: TMessage);
begin
    inherited;

    PlaceTrackBarAndButton();
end;

end.