TabControl.DrawItem イベント

定義

名前空間:

System.Windows.Forms

アセンブリ:

System.Windows.Forms.dll

TabControl プロパティが DrawMode に設定されている場合に、OwnerDrawFixed がその各タブを描画する必要があるときに発生します。

public:
 event System::Windows::Forms::DrawItemEventHandler ^ DrawItem;

public event System.Windows.Forms.DrawItemEventHandler? DrawItem;

member this.DrawItem : System.Windows.Forms.DrawItemEventHandler 

Public Custom Event DrawItem As DrawItemEventHandler 

イベントの種類

DrawItemEventHandler

例

次のコード例では、 を TabControl 1 つ TabPageで作成します。 次の使用例は、 のタブで文字列 Rectangle を描画するために使用されるイベント ハンドラーを宣言します tabPage1。 イベント ハンドラーは イベントに DrawItem バインドされます。

using namespace System::Drawing;
using namespace System::Windows::Forms;
public ref class Form1: public Form
{
private:
   Rectangle tabArea;
   RectangleF tabTextArea;

public:
   Form1()
   {
      TabControl^ tabControl1 = gcnew TabControl;
      TabPage^ tabPage1 = gcnew TabPage;
      
      // Allows access to the DrawItem event.
      tabControl1->DrawMode = TabDrawMode::OwnerDrawFixed;
      tabControl1->SizeMode = TabSizeMode::Fixed;
      tabControl1->Controls->Add( tabPage1 );
      tabControl1->ItemSize = System::Drawing::Size( 80, 30 );
      tabControl1->Location = Point(25,25);
      tabControl1->Size = System::Drawing::Size( 250, 250 );
      tabPage1->TabIndex = 0;
      ClientSize = System::Drawing::Size( 300, 300 );
      Controls->Add( tabControl1 );
      tabArea = tabControl1->GetTabRect( 0 );
      tabTextArea = tabControl1->GetTabRect( 0 );
      
      // Binds the event handler DrawOnTab to the DrawItem event
      // through the DrawItemEventHandler delegate.
      tabControl1->DrawItem += gcnew DrawItemEventHandler( this, &Form1::DrawOnTab );
   }


private:

   // Declares the event handler DrawOnTab which is a method that
   // draws a String* and Rectangle on the tabPage1 tab.
   void DrawOnTab( Object^ /*sender*/, DrawItemEventArgs^ e )
   {
      Graphics^ g = e->Graphics;
      Pen^ p = gcnew Pen( Color::Blue );
      System::Drawing::Font^ font = gcnew System::Drawing::Font( "Arial",10.0f );
      SolidBrush^ brush = gcnew SolidBrush( Color::Red );
      g->DrawRectangle( p, tabArea );
      g->DrawString( "tabPage1", font, brush, tabTextArea );
   }

};

int main()
{
   Application::Run( gcnew Form1 );
}

using System.Drawing;
using System.Windows.Forms;

public class Form1 : Form
{
    private Rectangle tabArea;
    private RectangleF tabTextArea;

    public Form1()
    {
        TabControl tabControl1 = new TabControl();
        TabPage tabPage1 = new TabPage();

        // Allows access to the DrawItem event. 
        tabControl1.DrawMode = TabDrawMode.OwnerDrawFixed;

        tabControl1.SizeMode = TabSizeMode.Fixed;
        tabControl1.Controls.Add(tabPage1);
        tabControl1.ItemSize = new Size(80, 30);
        tabControl1.Location = new Point(25, 25);
        tabControl1.Size = new Size(250, 250);
        tabPage1.TabIndex = 0;
        ClientSize = new Size(300, 300);
        Controls.Add(tabControl1);

        tabArea = tabControl1.GetTabRect(0);
        tabTextArea = (RectangleF)tabControl1.GetTabRect(0);

        // Binds the event handler DrawOnTab to the DrawItem event 
        // through the DrawItemEventHandler delegate.
        tabControl1.DrawItem += new DrawItemEventHandler(DrawOnTab);
    }

    // Declares the event handler DrawOnTab which is a method that
    // draws a string and Rectangle on the tabPage1 tab.
    private void DrawOnTab(object sender, DrawItemEventArgs e)
    {
        Graphics g = e.Graphics;
        Pen p = new Pen(Color.Blue);
        Font font = new Font("Arial", 10.0f);
        SolidBrush brush = new SolidBrush(Color.Red);

        g.DrawRectangle(p, tabArea);
        g.DrawString("tabPage1", font, brush, tabTextArea);
    }

    static void Main() 
    {
        Application.Run(new Form1());
    }
}

Imports System.Drawing
Imports System.Windows.Forms

Public Class Form1
    Inherits Form
    Private tabArea As Rectangle
    Private tabTextArea As RectangleF

    Public Sub New()
        Dim tabControl1 As New TabControl()
        Dim tabPage1 As New TabPage()

        ' Allows access to the DrawItem event. 
        tabControl1.DrawMode = TabDrawMode.OwnerDrawFixed

        tabControl1.SizeMode = TabSizeMode.Fixed
        tabControl1.Controls.Add(tabPage1)
        tabControl1.ItemSize = New Size(80, 30)
        tabControl1.Location = New Point(25, 25)
        tabControl1.Size = New Size(250, 250)
        tabPage1.TabIndex = 0
        ClientSize = New Size(300, 300)
        Controls.Add(tabControl1)

        tabArea = tabControl1.GetTabRect(0)
        tabTextArea = RectangleF.op_Implicit(tabControl1.GetTabRect(0))

        ' Binds the event handler DrawOnTab to the DrawItem event 
        ' through the DrawItemEventHandler delegate.
        AddHandler tabControl1.DrawItem, AddressOf DrawOnTab
    End Sub

    ' Declares the event handler DrawOnTab which is a method that
    ' draws a string and Rectangle on the tabPage1 tab.
    Private Sub DrawOnTab(ByVal sender As Object, ByVal e As DrawItemEventArgs)
        Dim g As Graphics = e.Graphics
        Dim p As New Pen(Color.Blue)
        Dim font As New Font("Arial", 10.0F)
        Dim brush As New SolidBrush(Color.Red)

        g.DrawRectangle(p, tabArea)
        g.DrawString("tabPage1", font, brush, tabTextArea)
    End Sub

    Shared Sub Main()
        Application.Run(New Form1())
    End Sub
End Class

注釈

プロパティを DrawMode に OwnerDrawFixed設定すると、 TabControl はタブの 1 つを DrawItem 塗りつぶす必要があるときにイベントを発生させます。 タブの外観をカスタマイズするには、 イベントのハンドラーに独自の描画コードを DrawItem 指定します。

では TabControl 、所有者描画を使用した可変タブ サイズはサポートされていません。

イベントの処理の詳細については、「処理とイベントの発生」を参照してください。

こちらもご覧ください

• DrawItemEventHandler
• OnDrawItem(DrawItemEventArgs)