KeyEventArgs.Alt プロパティとは何？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

KeyEventArgs.Alt プロパティ

Alt キーが押されたかどうかを示す値を取得します。

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 Overridable ReadOnly
 Property Alt As Boolean

Visual Basic (使用法)

Dim instance As KeyEventArgs
Dim value As Boolean

value = instance.Alt

public virtual bool Alt { get;
 }

C++

public:
virtual property bool Alt {
    bool get ();
}

/** @property */
public boolean get_Alt ()

JScript

public function get Alt
 () : boolean

プロパティ値
Alt キーが押された場合は true。それ以外の場合は false。

使用例

Visual Basic

' This example demonstrates how to use the KeyDown event with the Help
 class to display
' pop-up style help to the user of the application. The example filters
 for all variations
' of pressing the F1 key with a modifier key by using the KeyEventArgs
 properties passed
' to the event-handler method. 
' When the user presses any variation of F1 that includes any keyboard
 modifier, the Help
' class displays a pop-up window, similar to a ToolTip, near the control.
 If the user presses 
' ALT + F2, a different Help pop-up is displayed with additional information.
 This example assumes
' that a TextBox control, named textBox1, has been added to the form
 and its KeyDown
' event has been contected to this event-handler method.
Private Sub textBox1_KeyDown(ByVal
 sender As Object, ByVal
 e As System.Windows.Forms.KeyEventArgs) Handles textBox1.KeyDown
    ' Determine whether the key entered is the F1 key. If it is, display
 Help.
    If e.KeyCode = Keys.F1 AndAlso (e.Alt OrElse
 e.Control OrElse e.Shift) Then
        ' Display a pop-up Help topic to assist the user.
        Help.ShowPopup(textBox1, "Enter your name.",
 New Point(textBox1.Bottom, textBox1.Right))
    ElseIf e.KeyCode = Keys.F2 AndAlso e.Modifiers
 = Keys.Alt Then
        ' Display a pop-up Help topic to provide additional assistance
 to the user.
        Help.ShowPopup(textBox1, "Enter your first name followed
 by your last name. Middle name is optional.", _
             New Point(textBox1.Top, Me.textBox1.Left))
    End If
End Sub 'textBox1_KeyDown

// This example demonstrates how to use the KeyDown event with the Help
 class to display
// pop-up style help to the user of the application. The example filters
 for all variations
// of pressing the F1 key with a modifier key by using the KeyEventArgs
 properties passed
// to the event-handler method.
// When the user presses any variation of F1 that includes any keyboard
 modifier, the Help
// class displays a pop-up window, similar to a ToolTip, near the control.
 If the user presses
// ALT + F2, a different Help pop-up is displayed with additional information.
 This example assumes
// that a tTextBox control, named textBox1, has been added to the form
 and its KeyDown
// event has been contected to this event-handler method.
private void textBox1_KeyDown(object sender,
 System.Windows.Forms.KeyEventArgs e)
{
    // Determine whether the key entered is the F1 key. If it is, display
 Help.
    if(e.KeyCode == Keys.F1 && (e.Alt || e.Control ||
 e.Shift))
    {
        // Display a pop-up Help topic to assist the user.
        Help.ShowPopup(textBox1, "Enter your name.", new
 Point(textBox1.Bottom, textBox1.Right));
    }
    else if(e.KeyCode == Keys.F2 &&
 e.Modifiers == Keys.Alt)
    {
        // Display a pop-up Help topic to provide additional assistance
 to the user.
        Help.ShowPopup(textBox1, "Enter your first name followed by your last
 name. Middle name is optional.",
            new Point(textBox1.Top, this.textBox1.Left));
    }
}

C++

   // This example demonstrates how to use the KeyDown event with the Help
 class to display
   // pop-up style help to the user of the application. The example filters
 for all variations
   // of pressing the F1 key with a modifier key by using the KeyEventArgs
 properties passed
   // to the event handling method.
   // When the user presses any variation of F1 that includes any keyboard
 modifier, the Help
   // class displays a pop-up window, similar to a ToolTip, near the control.
 If the user presses
   // ALT + F2, a different Help pop-up is displayed with additional information.
 This example assumes
   // that a tTextBox control, named textBox1, has been added to the form
 and its KeyDown
   // event has been contected to this event handling method.
private:
   void textBox1_KeyDown( Object^ /*sender*/, System::Windows::Forms::KeyEventArgs^
 e )
   {
      // Determine whether the key entered is the F1 key. If it is, display
 Help.
      if ( e->KeyCode == Keys::F1 && (e->Alt ||
 e->Control || e->Shift) )
      {
         
         // Display a pop-up Help topic to assist the user.
         Help::ShowPopup( textBox1, "Enter your name.", Point(textBox1->Bottom,textBox1->Right)
 );
      }
      else
      if ( e->KeyCode == Keys::F2 && e->Modifiers
 == Keys::Alt )
      {
         // Display a pop-up Help topic to provide additional assistance
 to the user.
         Help::ShowPopup( textBox1, "Enter your first name followed by your
 last name. Middle name is optional.",
            Point(textBox1->Top,this->textBox1->Left)
 );
      }
   }

    // This example demonstrates how to use the KeyDown event with the Help
 
    // class to display pop-up style help to the user of the application.
    // The example filters for all variations of pressing the F1 key
 with
    // a modifier key by using the KeyEventArgs properties passed to
 the
    // event handling method.When the user presses any variation of
 F1 that
    // includes any keyboard modifier, the Help class displays a pop-up
 window,
    // similar to a ToolTip, near the control. If the user presses ALT
 + F2,
    // a different Help pop-up is displayed with additional information.
    // This example assumes that a tTextBox control, named textBox1,
 has been
    // added to the form and its KeyDown event has been contected to
 this 
    // event handling method.
    private void textBox1_KeyDown(Object sender
,
        System.Windows.Forms.KeyEventArgs e)
    {
        // Determine whether the key entered is the F1 key.
        //If it is, display Help.
        if (e.get_KeyCode().Equals(Keys.F1) && (e.get_Alt()
 || e.get_Control() 
            || e.get_Shift())) {
            // Display a pop-up Help topic to assist the user.
            Help.ShowPopup(textBox1, "Enter your name.", new
 Point(textBox1.
                get_Bottom(), textBox1.get_Right()));
        }
        else {
            if (e.get_KeyCode().Equals(Keys.F2) && e.get_Modifiers().
                Equals(Keys.Alt)) {
                // Display a pop-up Help topic to provide additional
 assistance
                // to the user.
                Help.ShowPopup(textBox1, "Enter your first name followed by"
 
                    + " your last name.Middle name is optional.",new
 Point(
                    textBox1.get_Top(), this.textBox1.get_Left()));
            }
        }
    } //textBox1_KeyDown
} //Form1

Visual Basic

Private Sub treeView1_KeyDown(sender As
 Object, _
  e As KeyEventArgs) Handles treeView1.KeyDown
   ' If the 'Alt' and 'E' keys are pressed,
   ' allow the user to edit the TreeNode label. 
   If e.Alt And e.KeyCode = Keys.E Then
      treeView1.LabelEdit = True
      ' If there is a TreeNode under the mose cursor, begin editing.
 
      Dim editNode As TreeNode = treeView1.GetNodeAt(
 _
        treeView1.PointToClient(Control.MousePosition))
      If Not (editNode Is
 Nothing) Then
         editNode.BeginEdit()
      End If
   End If
End Sub

Private Sub treeView1_AfterLabelEdit(sender
 As Object, _
  e As NodeLabelEditEventArgs) Handles treeView1.AfterLabelEdit
   ' Disable the ability to edit the TreeNode labels.
   treeView1.LabelEdit = False
End Sub

private void treeView1_KeyDown(object sender,
 KeyEventArgs e)
{
   /* If the 'Alt' and 'E' keys are pressed,
      * allow the user to edit the TreeNode label. */
   if(e.Alt && e.KeyCode == Keys.E)
         
   {
      treeView1.LabelEdit = true;
      // If there is a TreeNode under the mose cursor, begin editing.
 
      TreeNode editNode = treeView1.GetNodeAt(
         treeView1.PointToClient(Control.MousePosition));
      if(editNode != null)
      { 
         editNode.BeginEdit();
      }
   }
}

private void treeView1_AfterLabelEdit(object
 sender, NodeLabelEditEventArgs e)
{
   // Disable the ability to edit the TreeNode labels.
   treeView1.LabelEdit = false;
}

C++

private:
   void treeView1_KeyDown( Object^ /*sender*/, KeyEventArgs^ e
 )
   {
      /* If the 'Alt' and 'E' keys are pressed,
         * allow the user to edit the TreeNode label. */
      if ( e->Alt && e->KeyCode == Keys::E )
      {
         treeView1->LabelEdit = true;
         
         // If there is a TreeNode under the mose cursor, begin editing.
         TreeNode^ editNode = treeView1->GetNodeAt( treeView1->PointToClient(
 Control::MousePosition ) );
         if ( editNode != nullptr )
         {
            editNode->BeginEdit();
         }
      }
   }

   void treeView1_AfterLabelEdit( Object^ /*sender*/, NodeLabelEditEventArgs^
 /*e*/ )
   {
      // Disable the ability to edit the TreeNode labels.
      treeView1->LabelEdit = false;
   }

private void treeView1_KeyDown(Object sender,
 KeyEventArgs e)
{
    /* If the 'Alt' and 'E' keys are pressed,
       allow the user to edit the TreeNode label. 
     */
    if (e.get_Alt() && e.get_KeyCode() == Keys.E) {
        treeView1.set_LabelEdit(true);
        // If there is a TreeNode under the mose cursor, begin editing.
 
        TreeNode editNode = treeView1.GetNodeAt(treeView1.PointToClient(
            Control.get_MousePosition()));
        if (editNode != null) {
            editNode.BeginEdit();
        }
    }
} //treeView1_KeyDown

private void treeView1_AfterLabelEdit(Object
 sender, 
    NodeLabelEditEventArgs e)
{
    // Disable the ability to edit the TreeNode labels.
    treeView1.set_LabelEdit(false);
} //treeView1_AfterLabelEdit