suilistbox.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

        Exit;
    m_VScrollBar.Orientation := suiVertical;
    m_VScrollBar.OnChange := OnVScrollBArChange;
    m_VScrollBar.BringToFront();

    UpdateScrollBarsPos();
end;

procedure TsuiDirectoryListBox.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;
    m_SelfChanging := false;
end;

procedure TsuiDirectoryListBox.UpdateScrollBarsPos;
var
    L2R : Boolean;
begin
    if m_VScrollBar <> nil then
    begin
        if m_VScrollBar.Width > Width then
            m_VScrollBar.Left := Left
        else
        begin
            L2R := ((BidiMode = bdLeftToRight) or (BidiMode = bdRightToLeftReadingOnly)) or (not SysLocale.MiddleEast);
            if L2R then
                m_VScrollBar.Left := Left + Width - m_VScrollBar.Width - 2
            else
                m_VScrollBar.Left := Left + 2;
        end;
        m_VScrollBar.Top := Top + 1;
        m_VScrollBar.Height := Height - 2;
    end;

    UpdateScrollBars();
end;

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

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

    DrawControlBorder(self, m_BorderColor, Color);
end;

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

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

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

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

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

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

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

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

    DrawControlBorder(self, m_BorderColor, COlor);
end;

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

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

{ TsuiFileListBox }

procedure TsuiFileListBox.CMEnabledChanged(var Msg: TMessage);
begin
    inherited;
    UpdateScrollBars();
end;

procedure TsuiFileListBox.CMVisibleChanged(var Msg: TMEssage);
begin
    inherited;
    if not Visible then
    begin
        if m_VScrollBar <> nil then
            m_VScrollBar.Visible := Visible;
    end
    else
        UpdateScrollBarsPos();
end;

constructor TsuiFileListBox.Create(AOwner: TComponent);
begin
    inherited;

    ControlStyle := ControlStyle + [csOpaque];
    BorderStyle := bsNone;
    BorderWidth := 2;
    m_SelfChanging := false;
    m_MouseDown := false;

    UIStyle := GetSUIFormStyle(AOwner);
end;

procedure TsuiFileListBox.LBADDSTRING(var Msg: TMessage);
begin
    inherited;
    UpdateScrollBars();
end;

procedure TsuiFileListBox.LBDELETESTRING(var Msg: TMessage);
begin
    inherited;
    UpdateScrollBars();
end;

procedure TsuiFileListBox.LBINSERTSTRING(var Msg: TMessage);
begin
    inherited;
    UpdateScrollBars();
end;

procedure TsuiFileListBox.LBNSELCHANGE(var Msg: TMessage);
begin
    inherited;
    UpdateScrollBars();
end;

procedure TsuiFileListBox.LBNSETFOCUS(var Msg: TMessage);
begin
    inherited;
    UpdateScrollBars();
end;

procedure TsuiFileListBox.LBSETCOUNT(var Msg: TMessage);
begin
    inherited;
    UpdateScrollBars();
end;

procedure TsuiFileListBox.Notification(AComponent: TComponent;
  Operation: TOperation);
begin
    inherited;

    if AComponent = nil then
        Exit;

    if (
        (Operation = opRemove) and
        (AComponent = m_VScrollBar)
    )then
    begin
        m_VScrollBar := nil;
    end;

    if (
        (Operation = opRemove) and
        (AComponent = m_FileTheme)
    )then
    begin
        m_FileTheme := nil;
        SetUIStyle(SUI_THEME_DEFAULT);          
    end;
end;

procedure TsuiFileListBox.OnVScrollBarChange(Sender: TObject);
begin
    if m_SelfChanging then
        Exit;
    SendMessage(Handle, WM_VSCROLL, MakeWParam(SB_THUMBPOSITION, m_VScrollBar.Position), 0);
    Invalidate;
end;

procedure TsuiFileListBox.SetBorderColor(const Value: TColor);
begin
    m_BorderColor := Value;
    Repaint();
end;

procedure TsuiFileListBox.SetFileTheme(const Value: TsuiFileTheme);
begin
    m_FileTheme := Value;
    if m_VScrollBar <> nil then
        m_VScrollBar.FileTheme := Value;
    SetUIStyle(m_UIStyle);
end;

procedure TsuiFileListBox.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;
    Repaint();
end;

procedure TsuiFileListBox.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.Orientation := suiVertical;
    m_VScrollBar.OnChange := OnVScrollBArChange;
    m_VScrollBar.BringToFront();

    UpdateScrollBarsPos();
end;

procedure TsuiFileListBox.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;
    m_SelfChanging := false;
end;

procedure TsuiFileListBox.UpdateScrollBarsPos;
var
    L2R : Boolean;
begin
    if m_VScrollBar <> nil then
    begin
        if m_VScrollBar.Width > Width then
            m_VScrollBar.Left := Left
        else
        begin
            L2R := ((BidiMode = bdLeftToRight) or (BidiMode = bdRightToLeftReadingOnly)) or (not SysLocale.MiddleEast);
            if L2R then
                m_VScrollBar.Left := Left + Width - m_VScrollBar.Width - 2
            else
                m_VScrollBar.Left := Left + 2;
        end;
        m_VScrollBar.Top := Top + 1;
        m_VScrollBar.Height := Height - 2;
    end;

    UpdateScrollBars();
end;

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

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

    DrawControlBorder(self, m_BorderColor, COlor);
end;

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

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

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

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

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

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

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

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

    DrawControlBorder(self, m_BorderColor, COlor);
end;

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

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

end.