suitreeview.pas

SUIPack是一款为Delphi和C++Builder开发的所见即所得的界面增强VCL组件

    m_HScrollBar.OnChange := OnHScrollBArChange;
    m_HScrollBar.BringToFront();

    UpdateScrollBarsPos();
end;

procedure TsuiTreeView.SetUIStyle(const Value: TsuiUIStyle);
var
    OutUIStyle : TsuiUIStyle;
begin
    m_UIStyle := Value;
    if UsingFileTheme(m_FileTheme, m_UIStyle, OutUIStyle) then
        m_BorderColor := m_FileTheme.GetColor(SKIN2_CONTROLBORDERCOLOR)
    else
        m_BorderColor := GetInsideThemeColor(OutUIStyle, SUI_THEME_CONTROL_BORDER_COLOR);
    if m_VScrollBar <> nil then
        m_VScrollBar.UIStyle := OutUIStyle;
    if m_HScrollBar <> nil then
        m_HScrollBar.UIStyle := OutUIStyle;   
    Repaint();
end;

procedure TsuiTreeView.SetVScrollBar(const Value: TsuiScrollBar);
begin
    if m_VScrollBar = Value then
        Exit;
    if m_VScrollBar <> nil then
    begin
        m_VScrollBar.OnChange := nil;
        m_VScrollBar.LineButton := 0;
        m_VScrollBar.Max := 100;
        m_VScrollBar.Enabled := true;
    end;

    m_VScrollBar := Value;
    if m_VScrollBar = nil then
        Exit;
    m_VScrollBar.SmallChange := 5;        
    m_VScrollBar.Orientation := suiVertical;
    m_VScrollBar.OnChange := OnVScrollBArChange;
    m_VScrollBar.BringToFront();

    UpdateScrollBarsPos();
end;

procedure TsuiTreeView.UpdateScrollBars;
var
    info : tagScrollInfo;
    barinfo : tagScrollBarInfo;
    R : Boolean;
begin
    m_SelfChanging := true;
    if m_VScrollBar <> nil then
    begin
        barinfo.cbSize := SizeOf(barinfo);
        R := SUIGetScrollBarInfo(Handle, Integer(OBJID_VSCROLL), barinfo);
        if (barinfo.rgstate[0] = STATE_SYSTEM_INVISIBLE) or
           (barinfo.rgstate[0] = STATE_SYSTEM_UNAVAILABLE) or
           (not R) then
        begin
            m_VScrollBar.LineButton := 0;
            m_VScrollBar.Enabled := false;
            m_VScrollBar.Visible := false;
        end
        else if not Enabled then
            m_VScrollBar.Enabled := false
        else
        begin
            m_VScrollBar.LineButton := abs(barinfo.xyThumbBottom - barinfo.xyThumbTop);
            m_VScrollBar.Enabled := true;
            m_VScrollBar.Visible := true;
        end;
        info.cbSize := SizeOf(info);
        info.fMask := SIF_ALL;
        GetScrollInfo(Handle, SB_VERT, info);
        m_VScrollBar.Max := info.nMax - Integer(info.nPage) + 1;
        m_VScrollBar.Min := info.nMin;
        m_VScrollBar.Position := info.nPos;
    end;

    if m_HScrollBar <> nil then
    begin
        barinfo.cbSize := SizeOf(barinfo);
        R := SUIGetScrollBarInfo(Handle, Integer(OBJID_HSCROLL), barinfo);
        if (barinfo.rgstate[0] = STATE_SYSTEM_INVISIBLE) or
           (barinfo.rgstate[0] = STATE_SYSTEM_UNAVAILABLE) or
           (not R) then
        begin
            m_HScrollBar.LineButton := 0;
            m_HScrollBar.Enabled := false;
            m_HScrollBar.Visible := false;
        end
        else if not Enabled then
            m_HScrollBar.Enabled := false
        else
        begin
            m_HScrollBar.LineButton := abs(barinfo.xyThumbBottom - barinfo.xyThumbTop);
            m_HScrollBar.Enabled := true;
            m_HScrollBar.Visible := true;
        end;
        info.cbSize := SizeOf(info);
        info.fMask := SIF_ALL;
        GetScrollInfo(Handle, SB_HORZ, info);
        m_HScrollBar.Max := info.nMax - Integer(info.nPage) + 1;
        m_HScrollBar.Min := info.nMin;
        m_HScrollBar.Position := info.nPos;
    end;

    m_SelfChanging := false;
end;

procedure TsuiTreeView.UpdateScrollBarsPos;
var
    L2R : Boolean;
begin
    UpdateScrollBars();
    
    L2R := ((BidiMode = bdLeftToRight) or (BidiMode = bdRightToLeftReadingOnly)) or (not SysLocale.MiddleEast);

    if m_HScrollBar <> nil then
    begin
        if m_HScrollBar.Height > Height then
            m_HScrollBar.Top := Top
        else
        begin
            if L2R then
            begin
                m_HScrollBar.Left := Left + 1;
                m_HScrollBar.Top := Top + Height - m_HScrollBar.Height - 2;
                if m_VScrollBar <> nil then
                begin
                    if m_VScrollBar.Visible then
                        m_HScrollBar.Width := Width - 2 - m_VScrollBar.Width
                    else
                        m_HScrollBar.Width := Width - 2
                end
                else
                    m_HScrollBar.Width := Width - 2
            end
            else
            begin
                m_HScrollBar.Top := Top + Height - m_HScrollBar.Height - 2;
                if m_VScrollBar <> nil then
                begin
                    m_HScrollBar.Left := Left + m_VScrollBar.Width + 1;                
                    if m_VScrollBar.Visible then
                        m_HScrollBar.Width := Width - 2 - m_VScrollBar.Width
                    else
                        m_HScrollBar.Width := Width - 2
                end
                else
                begin
                    m_HScrollBar.Left := Left + 1;
                    m_HScrollBar.Width := Width - 2;
                end;
            end;
        end;
    end;

    if m_VScrollBar <> nil then
    begin
        if m_VScrollBar.Width > Width then
            m_VScrollBar.Left := Left
        else
        begin
            if L2R then
            begin
                m_VScrollBar.Left := Left + Width - m_VScrollBar.Width - 2;
                m_VScrollBar.Top := Top + 1;
                if m_HScrollBar <> nil then
                begin
                    if m_HScrollBar.Visible then
                        m_VScrollBar.Height := Height - 2 - m_HScrollBar.Height
                    else
                        m_VScrollBar.Height := Height - 2;
                end
                else
                    m_VScrollBar.Height := Height - 2;
            end
            else
            begin
                m_VScrollBar.Left := Left + 2;
                m_VScrollBar.Top := Top + 1;
                if m_HScrollBar <> nil then
                begin
                    if m_HScrollBar.Visible then
                        m_VScrollBar.Height := Height - 2 - m_HScrollBar.Height
                    else
                        m_VScrollBar.Height := Height - 2;
                end
                else
                    m_VScrollBar.Height := Height - 2;
            end;
        end;
    end;
end;

procedure TsuiTreeView.WMDELETEITEM(var Msg: TMessage);
begin
    inherited;
    UpdateScrollBars();
end;

procedure TsuiTreeView.WMEARSEBKGND(var Msg: TMessage);
begin
    inherited;

    DrawControlBorder(self, m_BorderColor, Color);
end;

procedure TsuiTreeView.WMHSCROLL(var Message: TWMHScroll);
begin
    inherited;
    UpdateScrollBars();
end;

procedure TsuiTreeView.WMKeyDown(var Message: TWMKeyDown);
begin
    inherited;
    UpdateScrollBars();
end;

procedure TsuiTreeView.WMLBUTTONDOWN(var Message: TMessage);
begin
    inherited;
    m_MouseDown := true;
    UpdateScrollBars();
end;

procedure TsuiTreeView.WMLButtonUp(var Message: TMessage);
begin
    inherited;
    m_MouseDown := false;
end;

procedure TsuiTreeView.WMMOUSEMOVE(var Message: TMessage);
begin
    inherited;
    if m_MouseDown then UpdateScrollBars();
end;

procedure TsuiTreeView.WMMOUSEWHEEL(var Message: TMessage);
begin
    inherited;
    UpdateScrollBars();
end;

procedure TsuiTreeView.WMMOVE(var Msg: TMessage);
begin
    inherited;
    UpdateScrollBarsPos();
end;

procedure TsuiTreeView.WMPAINT(var Msg: TMessage);
begin
    inherited;

    DrawControlBorder(self, m_BorderColor, Color);
end;

procedure TsuiTreeView.WMSIZE(var Msg: TMessage);
begin
    inherited;
    UpdateScrollBarsPos();
end;

procedure TsuiTreeView.WMVSCROLL(var Message: TWMVScroll);
begin
    inherited;
    UpdateScrollBars();
end;

end.