如何在不关闭菜单的情况下选择菜单项？

Question

默认情况下，当您从TMainMenu或TPopupMenu等中选择一个项目时，菜单会在单击后关闭。我想改变这种行为，以便当我选择一个菜单项时，菜单不会关闭但仍然可见并在最后一次点击时打开，这样可以更容易地选择另一个菜单项。当然，将焦点切换到另一个控件应该像正常一样隐藏菜单，但如果焦点仍然在菜单上，请保持可见。

如果可以，我希望此行为仅适用于指定的菜单项。换句话说，如果我可以使所有菜单项正常工作，但如果我指定一个或两个菜单项，那么这些菜单项在选择时不会关闭菜单。

我想这样做的原因是这样的，我在我的应用程序中有一个Preferences表单，其中可以配置许多选项，通常的东西等，但也在主表单中我有一些常见的更常用的选项设置在TMainMenu中。我希望能够在不关闭菜单的情况下选择这些常用选项，以便可以选择其他选项，而无需浏览菜单项。

是否有标准化的方法来实现这一目标？

由于

克雷格。

Answer 1

在下面的代码中，右键单击表单上的面板时，会启动一个包含三个项目的弹出菜单。第一项表现正常，另外两项也会触发其点击事件，但弹出式菜单未关闭。

弹出窗口是使用'TrackPopupMenu'启动的，如果您想要使用'OnPopup'事件，或者需要使用具有非关闭项目的子菜单，请参阅我发布到您的问题的评论中的链接。调整主菜单的代码也不难......

我没有评论代码不推广使用该方法，因为它使用了无证的消息，我觉得它有点复杂......

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Menus, ExtCtrls;

type
  TForm1 = class(TForm)
    PopupMenu1: TPopupMenu;
    Item1Normal1: TMenuItem;
    Item2NoClose1: TMenuItem;
    Item3NoClose1: TMenuItem;
    Panel1: TPanel;
    procedure Panel1ContextPopup(Sender: TObject; MousePos: TPoint;
      var Handled: Boolean);
  private
    FGetPopupWindowHandle: Boolean;
    FPopupWindowHandle: HWND;
    OrgPopupWindowProc, HookedPopupWindowProc: Pointer;
    FSelectedItemID: UINT;
    procedure WmInitMenuPopup(var Msg: TWMInitMenuPopup); message WM_INITMENUPOPUP;
    procedure WmEnterIdle(var Msg: TWMEnterIdle); message WM_ENTERIDLE;
    procedure WmMenuSelect(var Msg: TWMMenuSelect); message WM_MENUSELECT;
    procedure PopupWindowProc(var Msg: TMessage);
    procedure MenuSelectPos(Menu: TMenu; ItemPos: UINT; out CanClose: Boolean);
    procedure MenuSelectID(Menu: TMenu; ItemID: UINT; out CanClose: Boolean);
  public
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Panel1ContextPopup(Sender: TObject; MousePos: TPoint;
  var Handled: Boolean);
var
  Pt: TPoint;
begin
  Pt := (Sender as TPanel).ClientToScreen(MousePos);
  TrackPopupMenu(PopupMenu1.Handle, 0, Pt.X, Pt.Y, 0, Handle, nil);
end;

procedure TForm1.WmInitMenuPopup(var Msg: TWMInitMenuPopup);
begin
  inherited;
  if Msg.MenuPopup = PopupMenu1.Handle then
    FGetPopupWindowHandle := True;
end;

procedure TForm1.WmEnterIdle(var Msg: TWMEnterIdle);
begin
  inherited;
  if FGetPopupWindowHandle then begin
    FGetPopupWindowHandle := False;
    FPopupWindowHandle := Msg.IdleWnd;

    HookedPopupWindowProc := classes.MakeObjectInstance(PopupWindowProc);
    OrgPopupWindowProc := Pointer(GetWindowLong(FPopupWindowHandle, GWL_WNDPROC));
    SetWindowLong(FPopupWindowHandle, GWL_WNDPROC, Longint(HookedPopupWindowProc));
  end;
end;

procedure TForm1.WmMenuSelect(var Msg: TWMMenuSelect);
begin
  inherited;
  if Msg.Menu = PopupMenu1.Handle then
    FSelectedItemID := Msg.IDItem;
end;


const
  MN_BUTTONDOWN = $01ED;

procedure TForm1.PopupWindowProc(var Msg: TMessage);
var
  NormalItem: Boolean;
begin
  case Msg.Msg of
    MN_BUTTONDOWN:
      begin
        MenuSelectPos(PopupMenu1, UINT(Msg.WParamLo), NormalItem);
        if not NormalItem then
          Exit;
      end;
    WM_KEYDOWN:
      if Msg.WParam = VK_RETURN then begin
        MenuSelectID(PopupMenu1, FSelectedItemID, NormalItem);
        if not NormalItem then
          Exit;
      end;
    WM_DESTROY:
      begin
        SetWindowLong(FPopupWindowHandle, GWL_WNDPROC, Longint(OrgPopupWindowProc));
        classes.FreeObjectInstance(HookedPopupWindowProc);
      end;
  end;

  Msg.Result := CallWindowProc(OrgPopupWindowProc, FPopupWindowHandle,
      Msg.Msg, Msg.WParam, Msg.LParam);

end;


procedure TForm1.MenuSelectID(Menu: TMenu; ItemID: UINT; out CanClose: Boolean);
var
  Item: TMenuItem;
begin
  CanClose := True;
  Item := Menu.FindItem(ItemID, fkCommand);
  if Assigned(Item) then begin
    // Menu Item is clicked
    Item.Click;
//    Panel1.Caption := Item.Name;
    CanClose := Item = Item1Normal1;
  end;
end;

procedure TForm1.MenuSelectPos(Menu: TMenu; ItemPos: UINT; out CanClose: Boolean);
begin
  MenuSelectID(Menu, GetMenuItemID(Menu.Handle, ItemPos), CanClose);
end;

end.

Answer 2

基于@ Sertac的代码和其他资源，我创建了一个小型单元，它构成了TPopupMenu和TMainMenu的Interposer类（也适用于TNT版本）。

它也处理子菜单（每次激活子菜单时，都会创建一个带有新菜单句柄的新菜单窗口。）

我们的想法是创建一个应用程序定义的钩子（WH_CALLWNDPROC），其生命周期尽可能短。只要菜单模态循环处于活动状态，挂钩就会处于活动状态。一旦钩子检测到一个新的弹出窗口句柄（通过WM_ENTERIDLE），它就会将其子类化，直到它被销毁。

{.$DEFINE TNT}
unit AppTrackMenus;

interface

uses
  Windows, Messages, SysUtils, Classes, Controls, Forms, Contnrs, Menus
  {$IFDEF TNT}, TntMenus{$ENDIF};

type
  TTrackMenuNotifyEvent = procedure(Sender: TMenu; Item: TMenuItem; var CanClose: Boolean) of object;

  TPopupMenu = class(Menus.TPopupMenu)
  private
    FTrackMenu: Boolean;
    FOnTrackMenuNotify: TTrackMenuNotifyEvent;
  public
    procedure Popup(X, Y: Integer); override;
    property TrackMenu: Boolean read FTrackMenu write FTrackMenu;
    property OnTrackMenuNotify: TTrackMenuNotifyEvent read FOnTrackMenuNotify write FOnTrackMenuNotify;
  end;

  {$IFDEF TNT}
  TTntPopupMenu = class(TntMenus.TTntPopupMenu)
  private
    FTrackMenu: Boolean;
    FOnTrackMenuNotify: TTrackMenuNotifyEvent;
  public
    procedure Popup(X, Y: Integer); override;
    property TrackMenu: Boolean read FTrackMenu write FTrackMenu;
    property OnTrackMenuNotify: TTrackMenuNotifyEvent read FOnTrackMenuNotify write FOnTrackMenuNotify;
  end;
  {$ENDIF}

  TMainMenu = class(Menus.TMainMenu)
  private
    FTrackMenu: Boolean;
    FOnTrackMenuNotify: TTrackMenuNotifyEvent;
  public
    property TrackMenu: Boolean read FTrackMenu write FTrackMenu;
    property OnTrackMenuNotify: TTrackMenuNotifyEvent read FOnTrackMenuNotify write FOnTrackMenuNotify;
  end;

  {$IFDEF TNT}
  TTntMainMenu = class(TntMenus.TTntMainMenu)
  private
    FTrackMenu: Boolean;
    FOnTrackMenuNotify: TTrackMenuNotifyEvent;
  public
    property Hook: Boolean read FTrackMenu write FTrackMenu;
    property OnTrackMenuNotify: TTrackMenuNotifyEvent read FOnTrackMenuNotify write FOnTrackMenuNotify;
  end;
  {$ENDIF}

procedure FormMainMenuWndProcMessage(var Msg: TMessage; AForm: TCustomForm);

implementation    

const
  { Undocumented Menu Messages }
  MN_SETHMENU                 = $01E0;
  MN_GETHMENU                 = $01E1;
  MN_SIZEWINDOW               = $01E2;
  MN_OPENHIERARCHY            = $01E3;
  MN_CLOSEHIERARCHY           = $01E4;
  MN_SELECTITEM               = $01E5;
  MN_CANCELMENUS              = $01E6;
  MN_SELECTFIRSTVALIDITEM     = $01E7;
  MN_GETPPOPUPMENU            = $01EA;
  MN_FINDMENUWINDOWFROMPOINT  = $01EB;
  MN_SHOWPOPUPWINDOW          = $01EC;
  MN_BUTTONDOWN               = $01ED;
  MN_MOUSEMOVE                = $01EE;
  MN_BUTTONUP                 = $01EF;
  MN_SETTIMERTOOPENHIERARCHY  = $01F0;
  MN_DBLCLK                   = $01F1;

var
  ActiveHookMenu: TMenu = nil;  

type
  TPopupWndList = class;

  TPopupWnd = class
  private
    FHandle: THandle;
    FMenuHandle: HMENU;
    FOrgPopupWindowProc, FHookedPopupWindowProc: Pointer;
    FSelectedItemPos: Integer;
    FSelectedItemID: UINT;
    FHooked: Boolean;
    FPopupWndList: TPopupWndList;
    function GetHMenu: HMENU;
    procedure PopupWindowProc(var Msg: TMessage);
    procedure Hook;
    procedure UnHook;
    procedure MenuSelectPos(Menu: TMenu; ItemPos: UINT; out CanClose: Boolean);
    procedure MenuSelectID(Menu: TMenu; ItemID: UINT; out CanClose: Boolean);
  public
    property Handle: THandle read FHandle write FHandle;
    property MenuHandle: HMENU read FMenuHandle;
    constructor Create(APopupWndList: TPopupWndList; AHandle: THandle); overload;
    destructor Destroy; override;
  end;

  TPopupWndList = class(TObjectList)
  public
    function FindHookedPopupHWnd(MenuWindow: HWND): TPopupWnd;
    function FindHookedPopupHMenu(Menu: HMENU): TPopupWnd;
  end;

{ TPopupWnd }
constructor TPopupWnd.Create(APopupWndList: TPopupWndList; AHandle: THandle);
begin
  inherited Create;
  FHandle := AHandle;
  FMenuHandle := GetHMenu;
  FPopupWndList := APopupWndList;
  Hook;
end;

destructor TPopupWnd.Destroy;
begin
  if FHooked then // JIC: normally UnHook is called in PopupWindowProc WM_DESTROY
    UnHook;
  inherited;
end;

procedure TPopupWnd.Hook;
begin
  FOrgPopupWindowProc := Pointer(GetWindowLong(FHandle, GWL_WNDPROC));
  FHookedPopupWindowProc := MakeObjectInstance(PopupWindowProc);
  SetWindowLong(FHandle, GWL_WNDPROC, Longint(FHookedPopupWindowProc));
  FHooked := True;
end;

procedure TPopupWnd.UnHook;
begin
  SetWindowLong(FHandle, GWL_WNDPROC, Longint(FOrgPopupWindowProc));
  FreeObjectInstance(FHookedPopupWindowProc);
  FHooked := False;
end;

procedure TPopupWnd.PopupWindowProc(var Msg: TMessage);
var
  NormalItem: Boolean;
begin
  case Msg.Msg of
    MN_SELECTITEM:
      begin
        // -1 ($FFFF) => mouse is outside the menu window  
        FSelectedItemPos := Integer(Msg.wParam); // HiWord(Msg.wParam)
      end;
    MN_DBLCLK:
      begin
        Exit; // eat
      end;
    MN_BUTTONDOWN:
      begin
        MenuSelectPos(ActiveHookMenu, UINT(Msg.WParamLo), NormalItem);
        if not NormalItem then
          Exit;
      end;
    WM_KEYDOWN:
      if (Msg.WParam = VK_RETURN) and (FSelectedItemPos <> -1) and (FSelectedItemID <> 0) then begin            
        MenuSelectID(ActiveHookMenu, FSelectedItemID, NormalItem);
        if not NormalItem then
          Exit;
      end;
    WM_DESTROY:
      begin            
        UnHook;
      end;
  end;
  Msg.Result := CallWindowProc(FOrgPopupWindowProc, FHandle, Msg.Msg, Msg.WParam, Msg.LParam);
end;

procedure TPopupWnd.MenuSelectPos(Menu: TMenu; ItemPos: UINT; out CanClose: Boolean);
begin
  MenuSelectID(Menu, GetMenuItemID(GetHMenu, ItemPos), CanClose);
end;

function GetMenuItemPos(Menu: HMENU; ItemID: UINT): Integer;
var
  I: Integer;
  MenuItemInfo: TMenuItemInfo;
begin
  Result := -1;                         
  if IsMenu(Menu) then
    for I := 0 to GetMenuItemCount(Menu) do
    begin
      FillChar(MenuItemInfo, SizeOf(MenuItemInfo), 0);
      MenuItemInfo.cbSize := SizeOf(MenuItemInfo);
      MenuItemInfo.fMask := MIIM_ID;
      if (GetMenuItemInfo(Menu, I, True, MenuItemInfo)) then
        if MenuItemInfo.wID = ItemID then
        begin
          Result := I;
          Exit;
        end;
    end;
end;

procedure TPopupWnd.MenuSelectID(Menu: TMenu; ItemID: UINT; out CanClose: Boolean);
var
  Item: TMenuItem;
  NotifyEvent: TTrackMenuNotifyEvent;
  R: TRect;
begin
  CanClose := True;
  Item := Menu.FindItem(ItemID, fkCommand);
  if Assigned(Item) then
  begin
    NotifyEvent := nil;
    {$IFDEF TNT}
    if Menu is TTntPopupMenu then
      NotifyEvent := TTntPopupMenu(Menu).FOnTrackMenuNotify
    else
    {$ENDIF}
    if Menu is TPopupMenu then
      NotifyEvent := TPopupMenu(Menu).FOnTrackMenuNotify
    else
    {$IFDEF TNT}
    if Menu is TTntMainMenu then
      NotifyEvent := TTntMainMenu(Menu).FOnTrackMenuNotify
    else
    {$ENDIF}
    if Menu is TMainMenu then
      NotifyEvent := TMainMenu(Menu).FOnTrackMenuNotify;

    if Assigned(NotifyEvent) then
      NotifyEvent(Menu, Item, CanClose);

    if not CanClose then
    begin
      Item.Click;
      if GetMenuItemRect(FHandle, FMenuHandle, GetMenuItemPos(FMenuHandle, ItemID), R) then
      begin
        MapWindowPoints(0, FHandle, R, 2);
        InvalidateRect(FHandle, @R, False);
      end else
        InvalidateRect(FHandle, nil, False);
    end;
  end;
end;

function TPopupWnd.GetHMenu: HMENU;
begin
  Result := SendMessage(FHandle, MN_GETHMENU, 0, 0);
end;

{ TPopupWndList }
function TPopupWndList.FindHookedPopupHWnd(MenuWindow: HWND): TPopupWnd;
var
  I: Integer;
  PopupWnd: TPopupWnd;
begin
  Result := nil;
  for I := 0 to Count - 1 do
  begin
    PopupWnd := TPopupWnd(Items[I]);
    if (PopupWnd.FHooked) and (PopupWnd.Handle = MenuWindow) then
    begin
      Result := PopupWnd;
      Exit;
    end;
  end;
end;

function TPopupWndList.FindHookedPopupHMenu(Menu: HMENU): TPopupWnd;
var
  I: Integer;
  PopupWnd: TPopupWnd;
begin
  Result := nil;
  for I := 0 to Count - 1 do
  begin
    PopupWnd := TPopupWnd(Items[I]);
    if (PopupWnd.FHooked) and (PopupWnd.MenuHandle{GetHMenu} = Menu) then
    begin
      Result := PopupWnd;
      Exit;
    end;
  end;
end;

var
  PopupWndList: TPopupWndList = nil;
  MenuCallWndHook: HHOOK = 0;
  SelectedItemID: UINT = 0;
  NeedPopupWindowHandle: Boolean = False;
  InitMenuPopupCount: Integer = 0;

function CallWndHookProc(nCode: Integer; wParam: WPARAM; Msg: PCWPStruct): LRESULT; stdcall;
var
  Menu: HMENU;
  MenuWnd: HWND;
  PopupWnd: TPopupWnd;
begin
  if (nCode = HC_ACTION) then
  begin
    case Msg.message of
      WM_INITMENUPOPUP:
        begin // TWMInitMenuPopup
          Inc(InitMenuPopupCount);
          NeedPopupWindowHandle := True;
          SelectedItemID := 0;
          if PopupWndList = nil then
          begin
            PopupWndList := TPopupWndList.Create(True); // OwnsObjects
          end;
        end;
      WM_UNINITMENUPOPUP:
        begin
          Dec(InitMenuPopupCount);
        end;
      WM_ENTERIDLE:
        begin
          if (Msg.wParam = MSGF_MENU) and NeedPopupWindowHandle then
          begin
            NeedPopupWindowHandle := False;
            MenuWnd := HWND(Msg.lParam);
            if Assigned(PopupWndList) and (PopupWndList.FindHookedPopupHWnd(MenuWnd) = nil) then
              PopupWndList.Add(TPopupWnd.Create(PopupWndList, MenuWnd));
          end;
        end;
      WM_MENUSELECT:
        begin
          // MSDN: If the high-order word of wParam contains 0xFFFF and the lParam parameter contains NULL, the system has closed the menu.
          if (Msg.lParam = 0) and (HiWord(Msg.wParam) = $FFFF) then // Menu Closed
          begin
            FreeAndNil(PopupWndList);
          end
          else
          begin
            Menu := HMENU(Msg.lParam);
            if HiWord(Msg.wParam) and MF_POPUP <> 0 then // fkHandle
              SelectedItemID := GetSubMenu(Menu, LoWord(Msg.WParam))
            else // fkCommand
              SelectedItemID := LoWord(Msg.wParam); // TWMMenuSelect(Msg).IDItem;
            if Assigned(PopupWndList) then
            begin
              PopupWnd := PopupWndList.FindHookedPopupHMenu(Menu);
              if Assigned(PopupWnd) then
              begin
                PopupWnd.FSelectedItemID := LoWord(Msg.wParam);
              end;
            end;
          end;
        end;
    end;
  end;
  Result := CallNextHookEx(MenuCallWndHook, nCode, WParam, Longint(Msg));
end;

procedure InstallMenuCallWndHook(Menu: TMenu);
begin
  ActiveHookMenu := Menu;
  MenuCallWndHook := SetWindowsHookEx(WH_CALLWNDPROC, @CallWndHookProc, 0, GetCurrentThreadId);
end;

procedure UnInstallMenuCallWndHook;
begin
  if MenuCallWndHook <> 0 then
    UnHookWindowsHookEx(MenuCallWndHook);
  MenuCallWndHook := 0;
  ActiveHookMenu := nil;
  PopupWndList := nil;
end;

{ TPopupMenu }
procedure TPopupMenu.Popup(X, Y: Integer);
begin
  if not FTrackMenu then
    inherited
  else
  try
    InstallMenuCallWndHook(Self);
    inherited;
  finally
    UnInstallMenuCallWndHook;
  end;
end;

{ TTntPopupMenu }
{$IFDEF TNT}
procedure TTntPopupMenu.Popup(X, Y: Integer);
begin
  if not FTrackMenu then
    inherited
  else
  try
    InstallMenuCallWndHook(Self);
    inherited;
  finally
    UnInstallMenuCallWndHook;
  end;
end;
{$ENDIF}

function GetMenuForm(Menu: TMenu): TCustomForm;
var
  LForm: TWinControl;
begin
  Result := nil;
  if Menu.WindowHandle <> 0 then
  begin
    LForm := FindControl(Menu.WindowHandle);
    if (LForm <> nil) and (LForm is TCustomForm) then
      Result := LForm as TCustomForm;
  end;
end;

function FormMainMenuIsValid(AForm: TCustomForm): Boolean;
begin
  Result := False;
  if Assigned(AForm) and Assigned(AForm.Menu) then
  begin
    {$IFDEF TNT}
    if (AForm.Menu is TTntMainMenu) then
      Result := TTntMainMenu(AForm.Menu).FTrackMenu
    else
    {$ENDIF}
    if (AForm.Menu is TMainMenu) then
      Result := TMainMenu(AForm.Menu).FTrackMenu;
  end;
end;

procedure FormMainMenuWndProcMessage(var Msg: TMessage; AForm: TCustomForm);
begin
  if not FormMainMenuIsValid(AForm) then
    Exit;

  case Msg.Msg of
    WM_INITMENU:
      begin
        // MSDN: Sent when a menu is about to become active. It occurs when the user clicks an item on the menu bar or presses a menu key.
        // A window receives this message through its WindowProc function
        // A WM_INITMENU message is sent only when a menu is first accessed; only one WM_INITMENU message is generated for each access.
        // For example, moving the mouse across several menu items while holding down the button does not generate new messages
        InstallMenuCallWndHook(AForm.Menu);
      end;
    WM_MENUSELECT:
      begin
        // MSDN: If the high-order word of wParam contains 0xFFFF and the lParam parameter contains NULL, the system has closed the menu.
        if (Msg.lParam = 0) and (HiWord(Msg.wParam) = $FFFF) then // Menu Closed
        begin
          UnInstallMenuCallWndHook;
        end;
      end;
  end;
end;

end.

用法：

在表单上放置TPopupMenu和/或TMainMenu。在<{em> uses之后的AppTrackMenus包括Menus 。创建一些菜单项，并且对于您希望在单击时不要关闭的每个菜单项，设置Tag = 666（对于此示例）。您可以为这些项目分配OnClick事件处理程序CheckNoCloseClick。

uses 
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  Menus, AppTrackMenus;

TForm1 = class(TForm)
...
  procedure CheckNoCloseClick(Sender: TObject);
protected
  procedure WndProc(var Msg: TMessage); override; // for TMainMenu
private
  procedure TrackMenuNotifyHandler(Sender: TMenu; Item: TMenuItem; var CanClose: Boolean);
end;

implementation

procedure TForm1.FormCreate(Sender: TObject);
begin
  PopupMenu1.TrackMenu := True;
  PopupMenu1.OnTrackMenuNotify := TrackMenuNotifyHandler;
  MainMenu1.TrackMenu := True;
  MainMenu1.OnTrackMenuNotify := TrackMenuNotifyHandler;
end;

procedure TForm1.CheckNoCloseClick(Sender: TObject);
begin
  TMenuItem(Sender).Checked := not TMenuItem(Sender).Checked;
end;

procedure TForm1.TrackMenuNotifyHandler(Sender: TMenu; Item: TMenuItem; var CanClose: Boolean);
begin
  Caption := Sender.ClassName + '-' + Item.ClassName + '-' + Item.Name;
  CanClose := Item.Tag <> 666;
end;

procedure TForm1.WndProc(var Msg: TMessage); // for TMainMenu
begin
  FormMainMenuWndProcMessage(Msg, Self);
  inherited;
end;

TMainMenu插入器可以通过在运行时根据需要（通过设置新的Form.WindowProc）对其表单进行子类化来改进，而无需覆盖WndProc对于每个表格。但是，每个应用程序通常只有一个主菜单。也许下一个版本...... :)

在XP / Vista / Win7中测试

Answer 3

我的猜测是，虽然这是可以接受的，但你应该考虑编写自己的菜单系统，使用面板或表格，或完整的自定义控件/组件集，如果你想要的话，根本不使用标准的TPopupMenu或TMainMenu这样做。

如果你想要一些入门源代码，我会从像Toolbar2000 + SpTBX Sources这样的东西开始。我很确定你能用这些来实现这一点，但不能用TMainMenu和TPopupMenu完成，因为它们包含了一些Win32内置函数，这些内置函数会有行为（包括在你不想要的时候关闭），它是不可能覆盖的。 / p>

您也可以使用Developer Express工具栏组件开箱即用。

Answer 4

我最近有同样的需求，并发现TMS Smooth控件有“撕下”菜单，它具有类似的功能，但需要（如名称所示）菜单，嗯，撕掉！我从未接受过，因为我的需求不足以证明时间，金钱或第三方产品的使用是合理的。但是，我已经使用过其他一流的东西了。

不确定他们的撕下菜单是否会满足您的需求，但您可能想要查看它。

http://www.tmssoftware.com/site/advsmoothmegamenu.asp