LayoutEventHandler デリゲート
Control の Layout イベントを処理するメソッドを表します。
<Serializable>
Public Delegate Sub LayoutEventHandler( _ ByVal sender As Object, _ ByVal e As LayoutEventArgs _)
[C#]
[Serializable]
public delegate void LayoutEventHandler( object sender, LayoutEventArgs e);
[C++]
[Serializable]
public __gc __delegate void LayoutEventHandler( Object* sender, LayoutEventArgs* e);
[JScript] JScript では、.NET Framework のデリゲートを利用することができます。ただし、独自に定義することはできません。
パラメータ [Visual Basic, C#, C++]
作成するイベント ハンドラは、LayoutEventHandler クラスのデリゲート定義と同一のパラメータを持つ必要があります。
- sender
イベントのソース。 - e
イベント データを格納している LayoutEventArgs 。
解説
LayoutEventArgs デリゲートを作成する場合は、イベントを処理するメソッドを識別してください。イベントをイベント ハンドラに関連付けるには、デリゲートのインスタンスをイベントに追加します。デリゲートを削除しない限り、そのイベントが発生すると常にイベント ハンドラが呼び出されます。イベント ハンドラ デリゲートの詳細については、「 イベントとデリゲート 」を参照してください。
使用例
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.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
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 will enforce that the form's width is the preferred size of 300 pixels,
' or, the size of the button + 50 pixels, whichever is smaller.
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 proeprties on the LayoutEventArgs as null.
' The if statement protects against that case.
If Not (e.AffectedControl Is Nothing) And Not (e.AffectedProperty Is Nothing) Then
' Make sure the affected property is the Bounds property
' of the form.
If e.AffectedProperty.ToString() = "Bounds" Then
' If layoutButton's width + a 50 pixel padding is greater than the preferred
' size of 300 pixels, then grow 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 + a 20 pixel padding is larger than
' the 150 pixel preferred size, adjust 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 + a 20 pixel padding is greater than the preferred size of
' 150 pixels, grow layoutButton's width.
If textWidth + 20 > 150 Then
' Setting the size property on any control raises
' the Layout event for it's 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.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
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 will enforce that the form's width is the preferred size of 300 pixels,
// or, the size of the button + 50 pixels, whichever is smaller.
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 if statement protects against that case.
if ((e.AffectedControl != null) && (e.AffectedProperty != null))
{
// Make sure the affected property is the Bounds property
// of the form.
if (e.AffectedProperty.ToString() == "Bounds")
{
// If layoutButton's width + a 50 pixel padding is greater than the preferred
// size of 300 pixels, then grow 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 + a 20 pixel padding is larger than
// the 150 pixel preferred size, adjust 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 + a 20 pixel padding is greater than the preferred size of
// 150 pixels, grow layoutButton's width.
if ((textWidth + 20) > 150)
{
// Setting the size property on any control raises
// the Layout event for it's container.
this.layoutButton.Width = textWidth + 20;
}
// If not, keep layoutButton's width at 150 pixels.
else
{
this.layoutButton.Width = 150;
}
}
}
[C++]
public __gc 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:
void Dispose( bool disposing )
{
if( disposing )
{
if (components != 0)
{
components->Dispose();
}
}
Form::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 = System::Drawing::Point(72, 88);
this->layoutButton->Name = S"layoutButton";
this->layoutButton->Size = System::Drawing::Size(150, 23);
this->layoutButton->TabIndex = 0;
this->layoutButton->Text = S"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 = S"textBox1";
this->textBox1->Size = System::Drawing::Size(248, 20);
this->textBox1->TabIndex = 1;
this->textBox1->Text = S"Hello";
this->textBox1->TextChanged += new System::EventHandler(this, &Form1::textBox1_TextChanged);
//
// label1
//
this->label1->Location = System::Drawing::Point(24, 16);
this->label1->Name = S"label1";
this->label1->TabIndex = 2;
this->label1->Text = S"Button's Text:";
//
// Form1
//
this->AutoScaleBaseSize = System::Drawing::Size(5, 13);
this->ClientSize = System::Drawing::Size(292, 129);
System::Windows::Forms::Control* temp0 [] = {this->label1, this->textBox1, this->layoutButton};
this->Controls->AddRange(temp0);
this->Name = S"Form1";
this->Text = S"Layout Sample";
this->Layout += new System::Windows::Forms::LayoutEventHandler(this, &Form1::Form1_Layout);
this->ResumeLayout(false);
}
// This method will enforce that the form's width is the preferred size of 300 pixels,
// or, the size of the button + 50 pixels, whichever is smaller.
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 if statement protects against that case.
if ((e->AffectedControl != 0) && (e->AffectedProperty != 0))
{
// Make sure the affected property is the Bounds property
// of the form.
if (e->AffectedProperty->ToString()->Equals(S"Bounds"))
{
// If layoutButton's width + a 50 pixel padding is greater than the preferred
// size of 300 pixels, then grow 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 + a 20 pixel padding is larger than
// the 150 pixel preferred size, adjust 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 + a 20 pixel padding is greater than the preferred size of
// 150 pixels, grow 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(new Form1());
}
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をクリックします。
必要条件
名前空間: System.Windows.Forms
プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ
アセンブリ: System.Windows.Forms (System.Windows.Forms.dll 内)