ToolStripDropDown.Closing イベントとは何？わかりやすく解説 Weblio辞書

.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

ToolStripDropDown.Closing イベント

メモ : このイベントは、.NET Framework version 2.0 で新しく追加されたものです。

ToolStripDropDown コントロールが閉じるときに発生します。

名前空間: System.Windows.Forms
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文

Visual Basic (宣言)

Public Event Closing As
 ToolStripDropDownClosingEventHandler

Visual Basic (使用法)

Dim instance As ToolStripDropDown
Dim handler As ToolStripDropDownClosingEventHandler

AddHandler instance.Closing, handler

public event ToolStripDropDownClosingEventHandler Closing

C++

public:
event ToolStripDropDownClosingEventHandler^ Closing {
    void add (ToolStripDropDownClosingEventHandler^ value);
    void remove (ToolStripDropDownClosingEventHandler^ value);
}

/** @event */
public void add_Closing (ToolStripDropDownClosingEventHandler
 value)

/** @event */
public void remove_Closing (ToolStripDropDownClosingEventHandler
 value)

JScript

JScript では、イベントは使用できますが、新規に宣言することはできません。

解説

イベント処理の詳細については、「イベントの利用」を参照してください。

使用例

Closing イベントを処理することによって、ToolStripDropDown コントロールを選択的に閉じる方法を次のコード例に示します。

Visual Basic

' This method handles the Closing event. The ToolStripDropDown
' control is not allowed to close unless the Done menu item
' is clicked or the Close method is called explicitly.
' The Done menu item is enabled only after both of the other
' menu items have been selected.
Private Sub contextMenuStrip_Closing(sender
 As Object, e As ToolStripDropDownClosingEventArgs)
 Handles contextMenuStrip1.Closing
   If e.CloseReason <> ToolStripDropDownCloseReason.CloseCalled
 Then
      If subItem1ToolStripMenuItem.Checked AndAlso
 subItem2ToolStripMenuItem.Checked AndAlso doneToolStripMenuItem.Enabled
 Then
         ' Reset the state of menu items.
         subItem1ToolStripMenuItem.Checked = False
         subItem2ToolStripMenuItem.Checked = False
         doneToolStripMenuItem.Enabled = False
         
         ' Allow the ToolStripDropDown to close.
         ' Don't cancel the Close operation.
         e.Cancel = False
      Else
         ' Cancel the Close operation to keep the menu open.
         e.Cancel = True
         Me.toolStripStatusLabel1.Text = "Close
 canceled"
      End If
   End If
 End Sub

// This method handles the Closing event. The ToolStripDropDown
// control is not allowed to close unless the Done menu item
// is clicked or the Close method is called explicitly.
// The Done menu item is enabled only after both of the other
// menu items have been selected.
private void contextMenuStrip_Closing(
    object sender, 
    ToolStripDropDownClosingEventArgs e)
{
    if (e.CloseReason != ToolStripDropDownCloseReason.CloseCalled)
    {
        if (subItem1ToolStripMenuItem.Checked &&
            subItem2ToolStripMenuItem.Checked &&
            doneToolStripMenuItem.Enabled)
        {
            // Reset the state of menu items.
            subItem1ToolStripMenuItem.Checked = false;
            subItem2ToolStripMenuItem.Checked = false;
            doneToolStripMenuItem.Enabled = false;

            // Allow the ToolStripDropDown to close.
            // Don't cancel the Close operation.
            e.Cancel = false;
        }
        else
        {
            // Cancel the Close operation to keep the menu open.
            e.Cancel = true;
            this.toolStripStatusLabel1.Text = "Close canceled";
        }
    }
}