LayoutEventArgs.AffectedProperty プロパティとは？ わかりやすく解説

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LayoutEventArgs.AffectedProperty プロパティ

変更により影響を受けたプロパティを取得します。

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

Visual Basic (宣言)
Public ReadOnly Property
 AffectedProperty As String
Visual Basic (使用法)
Dim instance As LayoutEventArgs
Dim value As String

value = instance.AffectedProperty
C#
public string AffectedProperty { get;
 }
C++
public:
property String^ AffectedProperty {
    String^ get ();
}
J#
/** @property */
public String get_AffectedProperty ()
JScript
public function get AffectedProperty
 () : String

プロパティ値
変更により影響を受けたプロパティ。

解説解説

前回のレイアウト操作以降、子コントロールが表示されている場合は、Visible プロパティが影響を受けています。PerformLayout メソッドの呼び出し時に値が提供されなかった場合、AffectedProperty プロパティは null 参照 (Visual Basic では Nothing) に設定されます。

使用例使用例

AffectedProperty プロパティと AffectedControl プロパティを LayoutEventHandler の引数として使用することにより、Windows フォームとそのコントロールの両方に加えられたさまざまなプロパティの変更に合わせて、Windows フォームとコントロールのサイズを調整するコード例を次に示します。

Visual Basic
Public Class Form1
    Inherits System.Windows.Forms.Form
    Private WithEvents textBox1 As
 System.Windows.Forms.TextBox
    Private label1 As System.Windows.Forms.Label
    Private layoutButton As System.Windows.Forms.Button
    Private components As System.ComponentModel.Container
 = Nothing


    Public Sub New()
        InitializeComponent()
    End Sub

    Protected Overloads Overrides
 Sub Dispose(ByVal disposing As
 Boolean)
        If disposing Then
            If Not (components Is
 Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    Private Sub InitializeComponent()
        Me.layoutButton = New System.Windows.Forms.Button()
        Me.textBox1 = New System.Windows.Forms.TextBox()
        Me.label1 = New System.Windows.Forms.Label()
        Me.SuspendLayout()
        ' 
        ' layoutButton
        ' 
        Me.layoutButton.Anchor = System.Windows.Forms.AnchorStyles.Bottom
        Me.layoutButton.Location = New System.Drawing.Point(72,
 88)
        Me.layoutButton.Name = "layoutButton"
        Me.layoutButton.Size = New System.Drawing.Size(150,
 23)
        Me.layoutButton.TabIndex = 0
        Me.layoutButton.Text = "Hello"
        ' 
        ' textBox1
        ' 
        Me.textBox1.Anchor = System.Windows.Forms.AnchorStyles.Top
 Or System.Windows.Forms.AnchorStyles.Left Or
 System.Windows.Forms.AnchorStyles.Right
        Me.textBox1.Location = New System.Drawing.Point(24,
 40)
        Me.textBox1.Name = "textBox1"
        Me.textBox1.Size = New System.Drawing.Size(248,
 20)
        Me.textBox1.TabIndex = 1
        Me.textBox1.Text = "Hello"
        ' 
        ' label1
        ' 
        Me.label1.Location = New System.Drawing.Point(24,
 16)
        Me.label1.Name = "label1"
        Me.label1.TabIndex = 2
        Me.label1.Text = "Button's Text:"
        ' 
        ' Form1
        ' 
        Me.ClientSize = New System.Drawing.Size(292,
 129)
        Me.Controls.AddRange(New System.Windows.Forms.Control()
 {Me.label1, Me.textBox1, Me.layoutButton})
        Me.Name = "Form1"
        Me.Text = "Layout Sample"
        Me.ResumeLayout(False)
    End Sub

   ' This method ensures that the form's width is the preferred size
 of 300 pixels
   ' or the size of the button plus 50 pixels, whichever amount is less.
    Private Sub Form1_Layout(ByVal
 sender As Object, ByVal
 e As System.Windows.Forms.LayoutEventArgs) Handles MyBase.Layout
      ' This event is raised once at startup with the AffectedControl
      ' and AffectedProperty properties on the LayoutEventArgs as null.
 
      ' The event provides size preferences for that case.
        If Not (e.AffectedControl Is
 Nothing) And Not (e.AffectedProperty
 Is Nothing) Then
            ' Ensure that the affected property is the Bounds property
            ' of the form.
            If e.AffectedProperty.ToString() = "Bounds"
 Then
             ' If layoutButton's width plus a padding of 50 pixels is
 greater than the preferred 
             ' size of 300 pixels, increase the form's width.
                If Me.layoutButton.Width +
 50 > 300 Then
                    Me.Width = Me.layoutButton.Width
 + 50
                    ' If not, keep the form's width at 300 pixels.
                Else
                    Me.Width = 300
                End If

                ' Center layoutButton on the form.
                Me.layoutButton.Left = (Me.ClientSize.Width
 - Me.layoutButton.Width) / 2
            End If
        End If
    End Sub

    ' This method sets the Text property of layoutButton to the Text
 property
    ' of textBox1.  If the new text plus a padding of 20 pixels is larger
 than 
    ' the preferred size of 150 pixels, increase layoutButton's Width
 property.
    Private Sub textBox1_TextChanged(ByVal
 sender As Object, ByVal
 e As System.EventArgs) Handles textBox1.TextChanged
        ' Set the Text property of layoutButton.
        Me.layoutButton.Text = Me.textBox1.Text
        ' Get the width of the text using the proper font.
        Dim textWidth As Integer
 = CInt(Me.CreateGraphics().MeasureString(layoutButton.Text,
 layoutButton.Font).Width)

        ' If the width of the text plus a padding of 20 pixels is greater
 than the preferred size of
        ' 150 pixels, increase layoutButton's width.
        If textWidth + 20 > 150 Then
            ' Setting the size property on any control raises 
            ' the Layout event for its container.
            Me.layoutButton.Width = textWidth + 20
            ' If not, keep layoutButton's width at 150 pixels.
        Else
            Me.layoutButton.Width = 150
        End If
    End Sub
End Class
C#
public class Form1 : System.Windows.Forms.Form
{
   private System.Windows.Forms.TextBox textBox1;
   private System.Windows.Forms.Label label1;
   private System.Windows.Forms.Button layoutButton;
   private System.ComponentModel.Container components = null;

   public Form1()
   {
      InitializeComponent();
   }

   protected override void Dispose( bool
 disposing )
   {
      if( disposing )
      {
         if (components != null) 
         {
            components.Dispose();
         }
      }
      base.Dispose( disposing );
   }

   private void InitializeComponent()
   {
      this.layoutButton = new System.Windows.Forms.Button();
      this.textBox1 = new System.Windows.Forms.TextBox();
      this.label1 = new System.Windows.Forms.Label();
      this.SuspendLayout();
      // 
      // layoutButton
      // 
      this.layoutButton.Anchor = System.Windows.Forms.AnchorStyles.Bottom;
      this.layoutButton.Location = new System.Drawing.Point(72,
 88);
      this.layoutButton.Name = "layoutButton";
      this.layoutButton.Size = new System.Drawing.Size(150,
 23);
      this.layoutButton.TabIndex = 0;
      this.layoutButton.Text = "Hello";
      // 
      // textBox1
      // 
      this.textBox1.Anchor = ((System.Windows.Forms.AnchorStyles.Top
 | System.Windows.Forms.AnchorStyles.Left) 
         | System.Windows.Forms.AnchorStyles.Right);
      this.textBox1.Location = new System.Drawing.Point(24,
 40);
      this.textBox1.Name = "textBox1";
      this.textBox1.Size = new System.Drawing.Size(248,
 20);
      this.textBox1.TabIndex = 1;
      this.textBox1.Text = "Hello";
      this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
      // 
      // label1
      // 
      this.label1.Location = new System.Drawing.Point(24,
 16);
      this.label1.Name = "label1";
      this.label1.TabIndex = 2;
      this.label1.Text = "Button\'s Text:";
      // 
      // Form1
      // 
      this.ClientSize = new System.Drawing.Size(292,
 129);
      this.Controls.AddRange(new System.Windows.Forms.Control[]
 {
                                                                   this.label1
,
                                                                   this.textBox1
,
                                                                   this.layoutButton});
      this.Name = "Form1";
      this.Text = "Layout Sample";
      this.Layout += new System.Windows.Forms.LayoutEventHandler(this.Form1_Layout);
      this.ResumeLayout(false);

   }

   [STAThread]
   static void Main() 
   {
      Application.Run(new Form1());
   }
   
   // This method ensures that the form's width is the preferred size
 of 300 pixels
   // or the size of the button plus 50 pixels, whichever amount is
 less.
   private void Form1_Layout(object sender,
 System.Windows.Forms.LayoutEventArgs e)
   {
      // This event is raised once at startup with the AffectedControl
      // and AffectedProperty properties on the LayoutEventArgs as null.
 
      // The event provides size preferences for that case.
      if ((e.AffectedControl != null) &&
 (e.AffectedProperty != null))
      {
         // Ensure that the affected property is the Bounds property
         // of the form.
         if (e.AffectedProperty.ToString() == "Bounds")
 
         {
            // If layoutButton's width plus a padding of 50 pixels is
 greater than the preferred 
            // size of 300 pixels, increase the form's width.
            if ((this.layoutButton.Width +
 50) > 300) 
            {
               this.Width = this.layoutButton.Width
 + 50;
            }
               // If not, keep the form's width at 300 pixels.
            else 
            {
               this.Width = 300;
            }

            // Center layoutButton on the form.
            this.layoutButton.Left = (this.ClientSize.Width
 - this.layoutButton.Width) / 2;
         }
      }
   }

   // This method sets the Text property of layoutButton to the Text
 property
   // of textBox1.  If the new text plus a padding of 20 pixels is larger
 than 
   // the preferred size of 150 pixels, increase layoutButton's Width
 property.
   private void textBox1_TextChanged(object
 sender, System.EventArgs e)
   {
      // Set the Text property of layoutButton.
      this.layoutButton.Text = this.textBox1.Text;
      // Get the width of the text using the proper font.
      int textWidth = (int)this.CreateGraphics().MeasureString(layoutButton.Text,
 layoutButton.Font).Width;

      // If the width of the text plus a padding of 20 pixels is greater
 than the preferred size of
      // 150 pixels, increase layoutButton's width.
      if ((textWidth + 20) > 150)
      {
         // Setting the size property on any control raises 
         // the Layout event for its container.
         this.layoutButton.Width = textWidth + 20;
      }
         // If not, keep layoutButton's width at 150 pixels.
      else 
      {
         this.layoutButton.Width = 150;
      }
   }
}
C++
public ref class Form1: public
 System::Windows::Forms::Form
{
private:
   System::Windows::Forms::TextBox^ textBox1;
   System::Windows::Forms::Label ^ label1;
   System::Windows::Forms::Button^ layoutButton;
   System::ComponentModel::Container^ components;

public:
   Form1()
   {
      InitializeComponent();
   }

protected:
   ~Form1()
   {
      if ( components != nullptr )
      {
         delete components;
      }
   }

private:
   void InitializeComponent()
   {
      this->layoutButton = gcnew System::Windows::Forms::Button;
      this->textBox1 = gcnew System::Windows::Forms::TextBox;
      this->label1 = gcnew System::Windows::Forms::Label;
      this->SuspendLayout();

      // 
      // layoutButton
      // 
      this->layoutButton->Anchor = System::Windows::Forms::AnchorStyles::Bottom;
      this->layoutButton->Location = System::Drawing::Point(
 72, 88 );
      this->layoutButton->Name = "layoutButton";
      this->layoutButton->Size = System::Drawing::Size(
 150, 23 );
      this->layoutButton->TabIndex = 0;
      this->layoutButton->Text = "Hello";

      // 
      // textBox1
      // 
      this->textBox1->Anchor = static_cast<System::Windows::Forms::AnchorStyles>(System::Windows::Forms::AnchorStyles::Top
 | System::Windows::Forms::AnchorStyles::Left | System::Windows::Forms::AnchorStyles::Right);
      this->textBox1->Location = System::Drawing::Point(
 24, 40 );
      this->textBox1->Name = "textBox1";
      this->textBox1->Size = System::Drawing::Size( 248,
 20 );
      this->textBox1->TabIndex = 1;
      this->textBox1->Text = "Hello";
      this->textBox1->TextChanged += gcnew System::EventHandler(
 this, &Form1::textBox1_TextChanged );

      // 
      // label1
      // 
      this->label1->Location = System::Drawing::Point( 24,
 16 );
      this->label1->Name = "label1";
      this->label1->TabIndex = 2;
      this->label1->Text = "Button's Text:";

      // 
      // Form1
      // 
      this->ClientSize = System::Drawing::Size( 292, 129 );
      array<System::Windows::Forms::Control^>^temp0 = {this->label1
,this->textBox1,this->layoutButton};
      this->Controls->AddRange( temp0 );
      this->Name = "Form1";
      this->Text = "Layout Sample";
      this->Layout += gcnew System::Windows::Forms::LayoutEventHandler(
 this, &Form1::Form1_Layout );
      this->ResumeLayout( false );
   }

   // This method ensures that the form's width is the preferred size
 of 300 pixels
   // or the size of the button plus 50 pixels, whichever amount is
 less.
   void Form1_Layout( Object^ /*sender*/, System::Windows::Forms::LayoutEventArgs^
 e )
   {
      // This event is raised once at startup with the AffectedControl
      // and AffectedProperty properties on the LayoutEventArgs as null.
 
      // The event provides size preferences for that case.
      if ( (e->AffectedControl != nullptr) && (e->AffectedProperty
 != nullptr) )
      {
         // Ensure that the affected property is the Bounds property
         // of the form.
         if ( e->AffectedProperty->ToString()->Equals(
 "Bounds" ) )
         {
            // If layoutButton's width plus a padding of 50 pixels is
 greater than the preferred 
            // size of 300 pixels, increase the form's width.
            if ( (this->layoutButton->Width
 + 50) > 300 )
            {
               this->Width = this->layoutButton->Width
 + 50;
            }
            // If not, keep the form's width at 300 pixels.
            else
            {
               this->Width = 300;
            }

            // Center layoutButton on the form.
            this->layoutButton->Left = (this->ClientSize.Width
 - this->layoutButton->Width) / 2;
         }
      }
   }

   // This method sets the Text property of layoutButton to the Text
 property
   // of textBox1.  If the new text plus a padding of 20 pixels is larger
 than 
   // the preferred size of 150 pixels, increase layoutButton's Width
 property.
   void textBox1_TextChanged( Object^ /*sender*/, System::EventArgs^
 /*e*/ )
   {
      // Set the Text property of layoutButton.
      this->layoutButton->Text = this->textBox1->Text;

      // Get the width of the text using the proper font.
      int textWidth = (int)this->CreateGraphics()->MeasureString(
 layoutButton->Text, layoutButton->Font ).Width;

      // If the width of the text plus a padding of 20 pixels is greater
 than the preferred size of
      // 150 pixels, increase layoutButton's width.
      if ( (textWidth + 20) > 150 )
      {
         // Setting the size property on any control raises 
         // the Layout event for its container.
         this->layoutButton->Width = textWidth + 20;
      }
      // If not, keep layoutButton's width at 150 pixels.
      else
      {
         this->layoutButton->Width = 150;
      }
   }
};

[STAThread]
int main()
{
   Application::Run( gcnew Form1 );
}
J#
public class Form1 extends System.Windows.Forms.Form
{
    private System.Windows.Forms.TextBox textBox1;
    private System.Windows.Forms.Label label1;
    private System.Windows.Forms.Button layoutButton;
    private System.ComponentModel.Container components = null;

    public Form1()
    {
        InitializeComponent();
    } //Form1

    protected void Dispose(boolean disposing)
    {
        if (disposing) {
            if (components != null) {
                components.Dispose();
            }
        }
        super.Dispose(disposing);
    } //Dispose

    private void InitializeComponent()
    {
        this.layoutButton = new System.Windows.Forms.Button();
        this.textBox1 = new System.Windows.Forms.TextBox();
        this.label1 = new System.Windows.Forms.Label();
        this.SuspendLayout();
        //
        // layoutButton
        //
        this.layoutButton.set_Anchor(System.Windows.Forms.AnchorStyles.Bottom);
        this.layoutButton.set_Location(new
 System.Drawing.Point(72, 88));
        this.layoutButton.set_Name("layoutButton");
        this.layoutButton.set_Size(new System.Drawing.Size(150,
 23));
        this.layoutButton.set_TabIndex(0);
        this.layoutButton.set_Text("Hello");
        //
        // textBox1
        //
        this.textBox1.set_Anchor(System.Windows.Forms.AnchorStyles.Top
 
            | System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.
            AnchorStyles.Right);
        this.textBox1.set_Location(new System.Drawing.Point(24,
 40));
        this.textBox1.set_Name("textBox1");
        this.textBox1.set_Size(new System.Drawing.Size(248,
 20));
        this.textBox1.set_TabIndex(1);
        this.textBox1.set_Text("Hello");
        this.textBox1.add_TextChanged(new System.EventHandler(this.
            textBox1_TextChanged));
        //
        // label1
        //
        this.label1.set_Location(new System.Drawing.Point(24,
 16));
        this.label1.set_Name("label1");
        this.label1.set_TabIndex(2);
        this.label1.set_Text("Button\'s Text:");
        //
        // Form1
        //
        this.set_ClientSize(new System.Drawing.Size(292,
 129));
        this.get_Controls().AddRange(new System.Windows.Forms.Control[]
 { this.
            label1, this.textBox1, this.layoutButton
 });
        this.set_Name("Form1");
        this.set_Text("Layout Sample");
        this.add_Layout(new System.Windows.Forms.LayoutEventHandler(this.
            Form1_Layout));
        this.ResumeLayout(false);
    } //InitializeComponent

    /** @attribute STAThread()
     */
    public static void main(String[]
 args)
    {
        Application.Run(new Form1());
    } //main

   // This method ensures that the form's width is the preferred size
 of 300 pixels
   // or the size of the button plus 50 pixels, whichever amount is
 less.
    private void Form1_Layout(Object sender
,
        System.Windows.Forms.LayoutEventArgs e)
    {
      // This event is raised once at startup with the AffectedControl
      // and AffectedProperty properties on the LayoutEventArgs as null.
 
      // The event provides size preferences for that case.
        if (e.get_AffectedControl() != null
 
            && e.get_AffectedProperty() != null) {
            // Ensure that the affected property is the Bounds property
            // of the form.
            if ((e.get_AffectedProperty().ToString()).Equals("Bounds"))
 {
            // If layoutButton's width plus a padding of 50 pixels is
 greater 
            // than the preferred size of 300 pixels, increase the form's
 width.
                if (this.layoutButton.get_Width()
 + 50 > 300) {
                    this.set_Width(this.layoutButton.get_Width()
 + 50);
                }
                    // If not, keep the form's width at 300 pixels.
                else {
                    this.set_Width(300);
                }

                // Center layoutButton on the form.
                this.layoutButton.set_Left((this.get_ClientSize().get_Width()
 
                    - this.layoutButton.get_Width()) / 2);
            }
        }
    } //Form1_Layout

    // This method sets the Text property of layoutButton to the Text
 property
    // of textBox1.  If the new text plus a padding of 20 pixels is larger
 than 
    // the preferred size of 150 pixels, increase layoutButton's Width
 property.
    private void textBox1_TextChanged(Object
 sender, System.EventArgs e)
    {
        // Set the Text property of layoutButton.
        this.layoutButton.set_Text(this.textBox1.get_Text());
        // Get the width of the text using the proper font.
        int textWidth = (int)(this.CreateGraphics().MeasureString(layoutButton.
            get_Text(), layoutButton.get_Font()).get_Width());

        // If the width of the text plus a padding of 20 pixels is greater
 than the preferred size of
        // 150 pixels, increase layoutButton's width.
        if (textWidth + 20 > 150){
            // Setting the size property on any control raises 
            // the Layout event for its container.
            this.layoutButton.set_Width(textWidth + 20);
        }
            // If not, keep layoutButton's width at 150 pixels.
        else{
            this.layoutButton.set_Width(150);
        }
    } //textBox1_TextChanged
} //Form1
プラットフォームプラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報バージョン情報
.NET Framework
サポート対象 : 2.0、1.1、1.0
参照参照
関連項目
LayoutEventArgs クラス
LayoutEventArgs メンバ
System.Windows.Forms 名前空間
Control.Visible プロパティ
Control クラス
LayoutEventHandler
LayoutEventArgs.AffectedControl プロパティ

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LayoutEventArgs.AffectedProperty プロパティのお隣キーワード

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