DrawListViewItemEventArgsとは? わかりやすく解説

DrawListViewItemEventArgs クラス

メモ : このクラスは、.NET Framework version 2.0新しく追加されたものです。

ListView.DrawItem イベントデータ提供します

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

Public Class DrawListViewItemEventArgs
    Inherits EventArgs
Dim instance As DrawListViewItemEventArgs
public class DrawListViewItemEventArgs : EventArgs
public ref class DrawListViewItemEventArgs
 : public EventArgs
public class DrawListViewItemEventArgs extends
 EventArgs
public class DrawListViewItemEventArgs extends
 EventArgs
解説解説

ListView.DrawItem イベント利用すると、オーナー描画使用して ListView コントロール外観カスタマイズできます

ListView.OwnerDraw プロパティtrue設定されると、ListView.DrawItem イベントListView コントロールによって発生されますイベント ハンドラ渡される DrawListViewItemEventArgs には、描画する ListViewItem に関する情報格納されます。さらに、項目の描画に役立つメソッド提供します

描画する項目に関する情報取得するには、State プロパティまたは Item プロパティ使用します。項目のインデックス取得するには、DrawListViewItemEventArgs.ItemIndex プロパティ使用します

Graphics プロパティ使用してBounds プロパティ指定される領域内で実際に描画行いますカスタマイズを必要としない標準ListView 要素描画するには、DrawBackground メソッド、DrawText メソッド、DrawFocusRectangle メソッド使用します

メモメモ

オーナー描画の際にグラフィックちらつく問題回避するには、ListView コントロールオーバーライドし、DoubleBuffered プロパティtrue設定します。この機能は、Windows XP および Windows Server 2003 ファミリアプリケーションから Application.EnableVisualStyles メソッド呼び出す場合にのみ使用できます

使用例使用例

ListView コントロールカスタム描画提供する方法を示すコード例次に示します例の中の ListView コントロールには、グラデーション背景使用されています。負の値を持つサブ項目は、赤の前景色と黒の背景色表されます。

ListView.DrawItem イベントハンドラは項目全体背景描画ます。ListView.DrawSubItem イベントハンドラは、テキスト値を描画し、負の値を持つサブ項目についてはテキスト背景両方描画ます。DrawColumnHeader イベントハンドラは、各列ヘッダー描画ます。

ContextMenu コンポーネントは、詳細ビューリスト ビュー切り替えを行う手段提供しますリスト ビューでは、ListView.DrawItem イベントのみ発生します。この場合ListView.DrawItem イベント ハンドラテキスト背景両方描画されます。

Imports System
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Globalization
Imports System.Windows.Forms

Public Class ListViewOwnerDraw
    Inherits Form
    Private WithEvents listView1 As
 New ListView()
    Private WithEvents contextMenu1 As
 New ContextMenu()
    Private WithEvents listMenuItem As
 New MenuItem("List")
    Private WithEvents detailsMenuItem As
 New MenuItem("Details")

    Public Sub New()

        ' Initialize the shortcut menu. 
        contextMenu1.MenuItems.AddRange(New MenuItem() _
            {Me.listMenuItem, Me.detailsMenuItem})

        ' Initialize the ListView control.
        With Me.listView1
            .BackColor = Color.Black
            .ForeColor = Color.White
            .Dock = DockStyle.Fill
            .View = View.Details
            .FullRowSelect = True
            .OwnerDraw = True
            .ContextMenu = Me.contextMenu1
        End With

        ' Add columns to the ListView control.
        With Me.listView1.Columns
            .Add("Name", 72, HorizontalAlignment.Center)
            .Add("First", 72, HorizontalAlignment.Center)
            .Add("Second", 72, HorizontalAlignment.Center)
            .Add("Third", 72, HorizontalAlignment.Center)
        End With

        ' Create items and add them to the ListView control.
        Dim listViewItem1 As New
 ListViewItem(New String() _
            {"One", "20",
 "30", "-40"}, -1)
        Dim listViewItem2 As New
 ListViewItem(New String() _
            {"Two", "-250",
 "145", "37"}, -1)
        Dim listViewItem3 As New
 ListViewItem(New String() _
            {"Three", "200",
 "800", "-1,001"},
 -1)
        Dim listViewItem4 As New
 ListViewItem(New String() _
            {"Four", "not available",
 "-2", "100"}, -1)
        Me.listView1.Items.AddRange(New ListViewItem()
 _
            {listViewItem1, listViewItem2, listViewItem3, listViewItem4})

        ' Initialize the form and add the ListView control to it.
        With Me
            .ClientSize = New Size(292, 79)
            .FormBorderStyle = FormBorderStyle.FixedSingle
            .MaximizeBox = False
            .Text = "ListView OwnerDraw Example"
            .Controls.Add(Me.listView1)
        End With

    End Sub

    ' Clean up any resources being used.        
    Protected Overrides Sub
 Dispose(ByVal disposing As Boolean)
        If disposing Then
            contextMenu1.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub

    <STAThread()> _
    Shared Sub Main()
        Application.Run(New ListViewOwnerDraw())
    End Sub

    ' Sets the ListView control to the List view.
    Private Sub menuItemList_Click(ByVal
 sender As Object, _
        ByVal e As EventArgs) _
        Handles listMenuItem.Click

        Me.listView1.View = View.List

    End Sub

    ' Sets the ListView control to the Details view.
    Private Sub menuItemDetails_Click(ByVal
 sender As Object, _
        ByVal e As EventArgs) _
        Handles detailsMenuItem.Click

        Me.listView1.View = View.Details

        ' Reset the tag on each item to re-enable the workaround 
        ' in the MouseMove event handler.
        For Each item As
 ListViewItem In listView1.Items
            item.Tag = Nothing
        Next

    End Sub

    ' Selects and focuses an item when it is clicked anywhere along
 
    ' its width. The click must normally be on the parent item text.
    Private Sub listView1_MouseUp(ByVal
 sender As Object, _
        ByVal e As MouseEventArgs) _
        Handles listView1.MouseUp

        Dim clickedItem As ListViewItem = Me.listView1.GetItemAt(5,
 e.Y)
        If Not (clickedItem Is
 Nothing) Then
            clickedItem.Selected = True
            clickedItem.Focused = True
        End If

    End Sub

    ' Draws the backgrounds for entire ListView items.
    Private Sub listView1_DrawItem(ByVal
 sender As Object, _
        ByVal e As DrawListViewItemEventArgs)
 _
        Handles listView1.DrawItem

        If Not (e.State And
 ListViewItemStates.Selected) = 0 Then

            ' Draw the background for a selected item.
            e.Graphics.FillRectangle(Brushes.Maroon, e.Bounds)
            e.DrawFocusRectangle()

        Else

            ' Draw the background for an unselected item.
            Dim brush As New
 LinearGradientBrush(e.Bounds, Color.Orange, _
                Color.Maroon, LinearGradientMode.Horizontal)
            Try
                e.Graphics.FillRectangle(brush, e.Bounds)
            Finally
                brush.Dispose()
            End Try

        End If

        ' Draw the item text for views other than the Details view.
        If Not Me.listView1.View
 = View.Details Then
            e.DrawText()
        End If

    End Sub

    ' Draws subitem text and applies content-based formatting.
    Private Sub listView1_DrawSubItem(ByVal
 sender As Object, _
        ByVal e As DrawListViewSubItemEventArgs)
 _
        Handles listView1.DrawSubItem

        Dim flags As TextFormatFlags = TextFormatFlags.Left

        Dim sf As New StringFormat()
        Try

            ' Store the column text alignment, letting it default
            ' to Left if it has not been set to Center or Right.
            Select Case e.Header.TextAlign
                Case HorizontalAlignment.Center
                    sf.Alignment = StringAlignment.Center
                    flags = TextFormatFlags.HorizontalCenter
                Case HorizontalAlignment.Right
                    sf.Alignment = StringAlignment.Far
                    flags = TextFormatFlags.Right
            End Select

            ' Draw the text and background for a subitem with a 
            ' negative value. 
            Dim subItemValue As Double
            If e.ColumnIndex > 0 AndAlso
 _
                Double.TryParse(e.SubItem.Text, NumberStyles.Currency,
 _
                NumberFormatInfo.CurrentInfo, subItemValue) AndAlso
 _
                subItemValue < 0 Then

                ' Unless the item is selected, draw the standard 
                ' background to make it stand out from the gradient.
                If (e.ItemState And ListViewItemStates.Selected)
 = 0 Then
                    e.DrawBackground()
                End If

                ' Draw the subitem text in red to highlight it. 
                e.Graphics.DrawString(e.SubItem.Text, _
                    Me.listView1.Font, Brushes.Red, e.Bounds,
 sf)

                Return

            End If

            ' Draw normal text for a subitem with a nonnegative 
            ' or nonnumerical value.
            e.DrawText(flags)

        Finally
            sf.Dispose()
        End Try

    End Sub

    ' Draws column headers.
    Private Sub listView1_DrawColumnHeader(ByVal
 sender As Object, _
        ByVal e As DrawListViewColumnHeaderEventArgs)
 _
        Handles listView1.DrawColumnHeader

        Dim sf As New StringFormat()
        Try

            ' Store the column text alignment, letting it default
            ' to Left if it has not been set to Center or Right.
            Select Case e.Header.TextAlign
                Case HorizontalAlignment.Center
                    sf.Alignment = StringAlignment.Center
                Case HorizontalAlignment.Right
                    sf.Alignment = StringAlignment.Far
            End Select

            ' Draw the standard header background.
            e.DrawBackground()

            ' Draw the header text.
            Dim headerFont As New
 Font("Helvetica", 10, FontStyle.Bold)
            Try
                e.Graphics.DrawString(e.Header.Text, headerFont, _
                    Brushes.Black, e.Bounds, sf)
            Finally
                headerFont.Dispose()
            End Try

        Finally
            sf.Dispose()
        End Try

    End Sub

    ' Forces each row to repaint itself the first time the mouse moves
 over 
    ' it, compensating for an extra DrawItem event sent by the wrapped
 
    ' Win32 control.
    Private Sub listView1_MouseMove(ByVal
 sender As Object, _
        ByVal e As MouseEventArgs) _
        Handles listView1.MouseMove

        Dim item As ListViewItem = listView1.GetItemAt(e.X,
 e.Y)
        If Not item Is Nothing
 AndAlso item.Tag Is Nothing
 Then
            listView1.Invalidate(item.Bounds)
            item.Tag = "tagged"
        End If

    End Sub

End Class
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Globalization;
using System.Windows.Forms;

public class ListViewOwnerDraw : Form
{
    private ListView listView1 = new ListView();
    private ContextMenu contextMenu1 = new
 ContextMenu();

    public ListViewOwnerDraw()
    {
        // Initialize the ListView control.
        listView1.BackColor = Color.Black;
        listView1.ForeColor = Color.White;
        listView1.Dock = DockStyle.Fill;
        listView1.View = View.Details;
        listView1.FullRowSelect = true;

        // Add columns to the ListView control.
        listView1.Columns.Add("Name", 72, HorizontalAlignment.Center);
        listView1.Columns.Add("First", 72, HorizontalAlignment.Center);
        listView1.Columns.Add("Second", 72, HorizontalAlignment.Center);
        listView1.Columns.Add("Third", 72, HorizontalAlignment.Center);

        // Create items and add them to the ListView control.
        ListViewItem listViewItem1 = new ListViewItem(new
 string[] { "One", "20", "30",
 "-40" }, -1);
        ListViewItem listViewItem2 = new ListViewItem(new
 string[] { "Two", "-250", "145",
 "37" }, -1);
        ListViewItem listViewItem3 = new ListViewItem(new
 string[] { "Three", "200", "800",
 "-1,001" }, -1);
        ListViewItem listViewItem4 = new ListViewItem(new
 string[] { "Four", "not available", "-2",
 "100" }, -1);
        listView1.Items.AddRange(new ListViewItem[] { listViewItem1,
 listViewItem2, listViewItem3, listViewItem4 });

        // Initialize the shortcut menu and 
        // assign it to the ListView control.
        contextMenu1.MenuItems.Add("List",
            new EventHandler(menuItemList_Click));
        contextMenu1.MenuItems.Add("Details",
            new EventHandler(menuItemDetails_Click));
        listView1.ContextMenu = contextMenu1;

        // Configure the ListView control for owner-draw and add 
        // handlers for the owner-draw events.
        listView1.OwnerDraw = true;
        listView1.DrawItem += new
            DrawListViewItemEventHandler(listView1_DrawItem);
        listView1.DrawSubItem += new
            DrawListViewSubItemEventHandler(listView1_DrawSubItem);
        listView1.DrawColumnHeader += new
            DrawListViewColumnHeaderEventHandler(listView1_DrawColumnHeader);

        // Add a handler for the MouseMove event to compensate for an
 
        // extra DrawItem event that occurs the first time the mouse
 
        // moves over each row. 
        listView1.MouseMove += new MouseEventHandler(listView1_MouseMove);

        // Add a handler for the MouseUp event so an item can be 
        // selected by clicking anywhere along its width.
        listView1.MouseUp += new MouseEventHandler(listView1_MouseUp);

        // Initialize the form and add the ListView control to it.
        this.ClientSize = new Size(292, 79);
        this.FormBorderStyle = FormBorderStyle.FixedSingle;
        this.MaximizeBox = false;
        this.Text = "ListView OwnerDraw Example";
        this.Controls.Add(listView1);
    }

    // Clean up any resources being used.        
    protected override void Dispose(bool
 disposing)
    {
        if (disposing)
        {
            contextMenu1.Dispose();
        }
        base.Dispose(disposing);
    }

    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.Run(new ListViewOwnerDraw());
    }

    // Sets the ListView control to the List view.
    private void menuItemList_Click(object
 sender, EventArgs e)
    {
        listView1.View = View.List;
        listView1.Invalidate();
    }

    // Sets the ListView control to the Details view.
    private void menuItemDetails_Click(object
 sender, EventArgs e)
    {
        listView1.View = View.Details;

        // Reset the tag on each item to re-enable the workaround in
        // the MouseMove event handler.
        foreach (ListViewItem item in listView1.Items)
        {
            item.Tag = null;
        }
    }

    // Selects and focuses an item when it is clicked anywhere along
 
    // its width. The click must normally be on the parent item text.
    private void listView1_MouseUp(object sender,
 MouseEventArgs e)
    {
        ListViewItem clickedItem = listView1.GetItemAt(5, e.Y);
        if (clickedItem != null)
        {
            clickedItem.Selected = true;
            clickedItem.Focused = true;
        }
    }

    // Draws the backgrounds for entire ListView items.
    private void listView1_DrawItem(object
 sender,
        DrawListViewItemEventArgs e)
    {
        if ((e.State & ListViewItemStates.Selected) != 0)
        {
            // Draw the background and focus rectangle for a selected
 item.
            e.Graphics.FillRectangle(Brushes.Maroon, e.Bounds);
            e.DrawFocusRectangle();
        }
        else
        {
            // Draw the background for an unselected item.
            using (LinearGradientBrush brush =
                new LinearGradientBrush(e.Bounds, Color.Orange
,
                Color.Maroon, LinearGradientMode.Horizontal))
            {
                e.Graphics.FillRectangle(brush, e.Bounds);
            }
        }

        // Draw the item text for views other than the Details view.
        if (listView1.View != View.Details)
        {
            e.DrawText();
        }
    }

    // Draws subitem text and applies content-based formatting.
    private void listView1_DrawSubItem(object
 sender,
        DrawListViewSubItemEventArgs e)
    {
        TextFormatFlags flags = TextFormatFlags.Left;

        using (StringFormat sf = new StringFormat())
        {
            // Store the column text alignment, letting it default
            // to Left if it has not been set to Center or Right.
            switch (e.Header.TextAlign)
            {
                case HorizontalAlignment.Center:
                    sf.Alignment = StringAlignment.Center;
                    flags = TextFormatFlags.HorizontalCenter;
                    break;
                case HorizontalAlignment.Right:
                    sf.Alignment = StringAlignment.Far;
                    flags = TextFormatFlags.Right;
                    break;
            }

            // Draw the text and background for a subitem with a 
            // negative value. 
            double subItemValue;
            if (e.ColumnIndex > 0 && Double.TryParse(
                e.SubItem.Text, NumberStyles.Currency,
                NumberFormatInfo.CurrentInfo, out subItemValue) &&
                subItemValue < 0)
            {
                // Unless the item is selected, draw the standard 
                // background to make it stand out from the gradient.
                if ((e.ItemState & ListViewItemStates.Selected)
 == 0)
                {
                    e.DrawBackground();
                }

                // Draw the subitem text in red to highlight it. 
                e.Graphics.DrawString(e.SubItem.Text,
                    listView1.Font, Brushes.Red, e.Bounds, sf);

                return;
            }

            // Draw normal text for a subitem with a nonnegative 
            // or nonnumerical value.
            e.DrawText(flags);
        }
    }

    // Draws column headers.
    private void listView1_DrawColumnHeader(object
 sender,
        DrawListViewColumnHeaderEventArgs e)
    {
        using (StringFormat sf = new StringFormat())
        {
            // Store the column text alignment, letting it default
            // to Left if it has not been set to Center or Right.
            switch (e.Header.TextAlign)
            {
                case HorizontalAlignment.Center:
                    sf.Alignment = StringAlignment.Center;
                    break;
                case HorizontalAlignment.Right:
                    sf.Alignment = StringAlignment.Far;
                    break;
            }

            // Draw the standard header background.
            e.DrawBackground();

            // Draw the header text.
            using (Font headerFont =
                        new Font("Helvetica", 10, FontStyle.Bold))
            {
                e.Graphics.DrawString(e.Header.Text, headerFont,
                    Brushes.Black, e.Bounds, sf);
            }
        }
        return;
    }

    // Forces each row to repaint itself the first time the mouse moves
 over 
    // it, compensating for an extra DrawItem event sent by the wrapped
 
    // Win32 control.
    private void listView1_MouseMove(object
 sender, MouseEventArgs e)
    {
        ListViewItem item = listView1.GetItemAt(e.X, e.Y);
        if (item != null && item.Tag
 == null)
        {
            listView1.Invalidate(item.Bounds);
            item.Tag = "tagged";
        }
    }

}
#using <System.dll>
#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>

using namespace System;
using namespace System::Drawing;
using namespace System::Drawing::Drawing2D;
using namespace System::Globalization;
using namespace System::Windows::Forms;

public ref class ListViewOwnerDraw: public
 Form
{
private:
   ListView^ listView1;
   System::Windows::Forms::ContextMenu^ contextMenu1;

public:
   ListViewOwnerDraw()
   {
      listView1 = gcnew ListView;
      contextMenu1 = gcnew System::Windows::Forms::ContextMenu;

      // Initialize the ListView control.
      listView1->BackColor = Color::Black;
      listView1->ForeColor = Color::White;
      listView1->Dock = DockStyle::Fill;
      listView1->View = View::Details;
      listView1->FullRowSelect = true;

      // Add columns to the ListView control.
      listView1->Columns->Add( "Name", 72, HorizontalAlignment::Center
 );
      listView1->Columns->Add( "First", 72, HorizontalAlignment::Center
 );
      listView1->Columns->Add( "Second", 72, HorizontalAlignment::Center
 );
      listView1->Columns->Add( "Third", 72, HorizontalAlignment::Center
 );

      // Create items and add them to the ListView control.
      array<String^>^temp0 = {"One","20","30"
,"-40"};
      ListViewItem^ listViewItem1 = gcnew ListViewItem( temp0,-1 );
      array<String^>^temp1 = {"Two","-250","145"
,"37"};
      ListViewItem^ listViewItem2 = gcnew ListViewItem( temp1,-1 );
      array<String^>^temp2 = {"Three","200","800"
,"-1,001"};
      ListViewItem^ listViewItem3 = gcnew ListViewItem( temp2,-1 );
      array<String^>^temp3 = {"Four","not available","-2"
,"100"};
      ListViewItem^ listViewItem4 = gcnew ListViewItem( temp3,-1 );
      array<ListViewItem^>^temp4 = {listViewItem1,listViewItem2,listViewItem3
,listViewItem4};
      listView1->Items->AddRange( temp4 );

      // Initialize the shortcut menu and 
      // assign it to the ListView control.
      contextMenu1->MenuItems->Add( "List", gcnew EventHandler( this,
 &ListViewOwnerDraw::menuItemList_Click ) );
      contextMenu1->MenuItems->Add( "Details", gcnew EventHandler(
 this, &ListViewOwnerDraw::menuItemDetails_Click ) );
      listView1->ContextMenu = contextMenu1;

      // Configure the ListView control for owner-draw and add 
      // handlers for the owner-draw events.
      listView1->OwnerDraw = true;
      listView1->DrawItem += gcnew DrawListViewItemEventHandler( this,
 &ListViewOwnerDraw::listView1_DrawItem );
      listView1->DrawSubItem += gcnew DrawListViewSubItemEventHandler( this,
 &ListViewOwnerDraw::listView1_DrawSubItem );
      listView1->DrawColumnHeader += gcnew DrawListViewColumnHeaderEventHandler(
 this, &ListViewOwnerDraw::listView1_DrawColumnHeader );

      //listView1.MouseMove += gcnew MouseEventHandler(&ListViewOwnerDraw::listView1_MouseMove);
      // Add a handler for the MouseUp event so an item can be 
      // selected by clicking anywhere along its width.
      listView1->MouseUp += gcnew MouseEventHandler( this,
 &ListViewOwnerDraw::listView1_MouseUp );

      // Initialize the form and add the ListView control to it.
      this->ClientSize = System::Drawing::Size( 292, 79 );
      this->FormBorderStyle = System::Windows::Forms::FormBorderStyle::FixedSingle;
      this->MaximizeBox = false;
      this->Text = "ListView OwnerDraw Example";
      this->Controls->Add( listView1 );
   }

   // Clean up any resources being used.        
public:
   ~ListViewOwnerDraw()
   {
      if ( contextMenu1 != nullptr )
      {
         delete contextMenu1;
      }
   }

private:

   // Sets the ListView control to the List view.
   void menuItemList_Click( Object^ /*sender*/, EventArgs^ /*e*/
 )
   {
      listView1->View = View::List;
   }

   // Sets the ListView control to the Details view.
   void menuItemDetails_Click( Object^ /*sender*/, EventArgs^
 /*e*/ )
   {
      listView1->View = View::Details;
   }

   // Selects and focuses an item when it is clicked anywhere along
 
   // its width. The click must normally be on the parent item text.
   void listView1_MouseUp( Object^ /*sender*/, MouseEventArgs^
 e )
   {
      ListViewItem^ clickedItem = listView1->GetItemAt( 5, e->Y );
      if ( clickedItem != nullptr )
      {
         clickedItem->Selected = true;
         clickedItem->Focused = true;
      }
   }

   // Draws the backgrounds for entire ListView items.
private:
   void listView1_DrawItem( Object^ /*sender*/, DrawListViewItemEventArgs^
 e )
   {
      if ( (e->State & ListViewItemStates::Selected) !=
 (ListViewItemStates)0 )
      {
         // Draw the background for a selected item.
         e->Graphics->FillRectangle( Brushes::Maroon, e->Bounds );
         e->DrawFocusRectangle();
      }
      else
      {
         // Draw the background for an unselected item.
         LinearGradientBrush^ myBrush = gcnew LinearGradientBrush( e->Bounds,Color::Orange,Color::Maroon,LinearGradientMode::Horizontal
 );
         try
         {
            e->Graphics->FillRectangle( myBrush, e->Bounds );
         }
         finally
         {
            if ( myBrush )
               delete (IDisposable^)myBrush;
         }
      }

      if ( listView1->View != View::Details )
      {
         e->DrawText();
      }
   }

   // Draws subitem text and applies content-based formatting.
private:
   void listView1_DrawSubItem( Object^ /*sender*/, DrawListViewSubItemEventArgs^
 e )
   {
      TextFormatFlags flags = TextFormatFlags::Left;
      StringFormat^ sf = gcnew StringFormat;
      try
      {
         // Store the column text alignment, letting it default
         // to Left if it has not been set to Center or Right.
         switch ( e->Header->TextAlign )
         {
            case HorizontalAlignment::Center:
               sf->Alignment = StringAlignment::Center;
               flags = TextFormatFlags::HorizontalCenter;
               break;

            case HorizontalAlignment::Right:
               sf->Alignment = StringAlignment::Far;
               flags = TextFormatFlags::Right;
               break;
         }

         // Draw the text and background for a subitem with a 
         // negative value. 
         double subItemValue;
         if ( e->ColumnIndex > 0 && Double::TryParse(
 e->SubItem->Text, NumberStyles::Currency, NumberFormatInfo::CurrentInfo,
 subItemValue ) && subItemValue < 0 )
         {
            // Unless the item is selected, draw the standard 
            // background to make it stand out from the gradient.
            if ( (e->ItemState & ListViewItemStates::Selected)
 == (ListViewItemStates)0 )
            {
               e->DrawBackground();
            }

            // Draw the subitem text in red to highlight it. 
            e->Graphics->DrawString( e->SubItem->Text, listView1->Font,
 Brushes::Red, e->Bounds, sf );
            return;
         }

         // Draw normal text for a subitem with a nonnegative 
         // or nonnumerical value.
         e->DrawText( flags );
      }
      finally
      {
         if ( sf )
            delete (IDisposable^)sf;
      }
   }

   // Draws column headers.
private:
   void listView1_DrawColumnHeader( Object^ /*sender*/, DrawListViewColumnHeaderEventArgs^
 e )
   {
      StringFormat^ sf = gcnew StringFormat;
      try
      {
         // Store the column text alignment, letting it default
         // to Left if it has not been set to Center or Right.
         switch ( e->Header->TextAlign )
         {
            case HorizontalAlignment::Center:
               sf->Alignment = StringAlignment::Center;
               break;

            case HorizontalAlignment::Right:
               sf->Alignment = StringAlignment::Far;
               break;
         }

         // Draw the standard header background.
         e->DrawBackground();

         // Draw the header text.
         System::Drawing::Font^ headerFont = gcnew System::Drawing::Font( "Helvetica",10,FontStyle::Bold
 );
         try
         {
            e->Graphics->DrawString( e->Header->Text, headerFont, Brushes::Black,
 e->Bounds, sf );
         }
         finally
         {
            if ( headerFont )
               delete (IDisposable^)headerFont;
         }
      }
      finally
      {
         if ( sf )
            delete (IDisposable^)sf;
      }

      return;
   }

   // Forces the row the mouse is on to repaint itself. 
   void listView1_MouseMove( Object^ /*sender*/, MouseEventArgs^
 e )
   {
      ListViewItem^ item = listView1->GetItemAt( e->X, e->Y );
      if ( item != nullptr )
      {
         listView1->Invalidate( item->Bounds );
      }
   }
};

[STAThread]
int main()
{
   Application::Run( gcnew ListViewOwnerDraw );
}
import System.*;
import System.Drawing.*;
import System.Drawing.Drawing2D.*;
import System.Globalization.*;
import System.Windows.Forms.*;

public class ListViewOwnerDraw extends Form
{
    private ListView myListView;
    private ContextMenu myContextMenu;

    public ListViewOwnerDraw()
    {
        // Create and initialize the ListView control.
        myListView = new ListView();
        myListView.set_BackColor(Color.get_Black());
        myListView.set_ForeColor(Color.get_White());
        myListView.set_Dock(DockStyle.Fill);
        myListView.set_View(View.Details);

        // Add columns to the ListView control.
        myListView.get_Columns().Add("Name", 72, HorizontalAlignment.Center);
        myListView.get_Columns().Add("First", 72, HorizontalAlignment.Center);
        myListView.get_Columns().Add("Second", 72, HorizontalAlignment.Center);
        myListView.get_Columns().Add("Third", 72, HorizontalAlignment.Center);

        // Create items and add them to the ListView control.
        ListViewItem listViewItem1 = new ListViewItem(new
 String[] 
            { "One", "20", "30", "-40" },
 -1);
        ListViewItem listViewItem2 = new ListViewItem(new
 String[] 
            { "Two", "-250", "145", "37"
 }, -1);
        ListViewItem listViewItem3 = new ListViewItem(new
 String[] 
            { "Three", "200", "800", "-1,001"
 }, -1);
        ListViewItem listViewItem4 = new ListViewItem(new
 String[] 
            { "Four", "not available", "-2", "100"
 }, -1);
        myListView.get_Items().AddRange(new ListViewItem[] { listViewItem1,
 
            listViewItem2, listViewItem3, listViewItem4 });

        // Create a shortcut menu for changing views and 
        // assign it to the ListView control.
        myContextMenu = new ContextMenu();
        myContextMenu.get_MenuItems().Add("List", 
            new EventHandler(menuItemList_Click));
        myContextMenu.get_MenuItems().Add("Details", 
            new EventHandler(menuItemDetails_Click));
        myListView.set_ContextMenu(myContextMenu);

        // Configure the ListView control for owner-draw and add 
        // handlers for the owner-draw events.
        myListView.set_OwnerDraw(true);
        myListView.add_DrawItem(new DrawListViewItemEventHandler(
            myListView_DrawItem));
        myListView.add_DrawSubItem(new DrawListViewSubItemEventHandler(
            myListView_DrawSubItem));

        // Add a handler for the MouseUp event so an item can be 
        // selected by clicking anywhere along its width.
        myListView.add_MouseUp(new MouseEventHandler(myListView_MouseUp));

        // Initialize the form and add the ListView control to it.
        this.set_ClientSize(new Size(292, 79));
        this.set_FormBorderStyle(get_FormBorderStyle().FixedSingle);
        this.set_MaximizeBox(false);
        this.set_Text("ListView OwnerDraw Example");
        this.get_Controls().Add(myListView);
    } //ListViewOwnerDraw

    // Clean up any resources being used.        
    protected void Dispose(boolean disposing)
    {
        if (disposing) {
            myContextMenu.Dispose();
        }
        super.Dispose(disposing);
    } //Dispose

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

    // Sets the ListView control to the List view.
    private void menuItemList_Click(Object
 sender, EventArgs e)
    {
        myListView.set_View(View.List);
    } //menuItemList_Click

    // Sets the ListView control to the Details view.
    private void menuItemDetails_Click(Object
 sender, EventArgs e)
    {
        myListView.set_View(View.Details);
    } //menuItemDetails_Click

    // Selects and focuses an item when it is clicked anywhere along
 
    // its width. The click must normally be on the parent item text.
    private void myListView_MouseUp(Object
 sender, MouseEventArgs e)
    {
        ListViewItem clickedItem = myListView.GetItemAt(5, e.get_Y());
        if (clickedItem != null) {
            clickedItem.set_Selected(true);
            clickedItem.set_Focused(true);
        }
    } //myListView_MouseUp

    // Draws the backgrounds for the column header row and for entire
    // ListView items.
    private void myListView_DrawItem(Object
 sender, DrawListViewItemEventArgs e)
    {
        // Draw the background for the column header row.
        if (e.get_ItemIndex() == -1) {
            e.get_Item().set_BackColor(Color.get_Black());
            e.DrawBackground();
        }
        // Draw the background for a selected item.
        else {
            if (Convert.ToInt32((e.get_State() & ListViewItemStates.Selected))
                != 0) {
                e.get_Graphics().FillRectangle(Brushes.get_Maroon(),
                    e.get_Bounds());
                e.DrawFocusRectangle();
            }
            // Draw the background for an unselected item.
            else {
                LinearGradientBrush myBrush = new LinearGradientBrush(
                    e.get_Bounds(), Color.get_Orange(), Color.get_Maroon(),
                    LinearGradientMode.Horizontal);
                try {
                    e.get_Graphics().FillRectangle(myBrush, e.get_Bounds());
                }
                finally {
                    myBrush.Dispose();
                }    
            }
        }
        // Draw the item text for views other than the Details view.
        if (!(((ListView)sender).get_View().Equals(View.Details)))
 {
            e.DrawText();
        }
    } //myListView_DrawItem

    // Draws subitem text and applies content-based formatting.
    private void myListView_DrawSubItem(Object
 sender,
        DrawListViewSubItemEventArgs e)
    {
        TextFormatFlags flags = TextFormatFlags.Left;
        StringFormat sf = new StringFormat();
        try {
            // Store the column text alignment, letting it default
            // to Left if it has not been set to Center or Right.
            if (e.get_Header().get_TextAlign().
                Equals(HorizontalAlignment.Center)) {

                sf.set_Alignment(StringAlignment.Center);
                flags = TextFormatFlags.HorizontalCenter;
            }
            else {
                if (e.get_Header().get_TextAlign().
                    Equals(HorizontalAlignment.Right)) {

                    sf.set_Alignment(StringAlignment.Far);
                    flags = TextFormatFlags.Right;
                }
            }
            // Draw the text for a column header.
            if (e.get_ItemIndex() == -1) {
                Font myFont = new Font("Helvetica",
 12, FontStyle.Bold);
                try {
                    e.get_Graphics().DrawString(e.get_Item().get_Text(), 
                        myFont, Brushes.get_White(), 
                        new PointF((float)e.get_Bounds().get_X(),
 
                        (float)e.get_Bounds().get_Y()), sf);
                }
                finally {
                    myFont.Dispose();
                }
                return;
            }

            // Draw the text and background for a subitem with a 
            // negative value. 
            double subItemValue = 0;
            if (e.get_ColumnIndex() > 0 && System.Double.TryParse(
                e.get_Item().get_SubItems().get_Item(e.get_ColumnIndex()).
                get_Text(), NumberStyles.Currency, 
                NumberFormatInfo.get_CurrentInfo(), subItemValue) 
                && subItemValue < 0) {

                // Unless the item is selected, draw the standard 
                // background to make it stand out from the gradient.
                if (Convert.ToInt32(e.get_ItemState() 
                    & ListViewItemStates.Selected) == 0) {
                    e.DrawBackground();
                }
                // Draw the subitem text in red to highlight it. 
                e.get_Graphics().DrawString(e.get_Item().get_SubItems().
                    get_Item(e.get_ColumnIndex()).get_Text(), 
                    ((ListView)sender).get_Font(), Brushes.get_Red(), 
                    RectangleF.op_Implicit(e.get_Bounds()), sf);

                return;
            }
            // Draw normal text for a subitem with a nonnegative 
            // or nonnumerical value.
            e.DrawText(flags);
        }
        finally {
            sf.Dispose();
        }
    } //myListView_DrawSubItem
} //ListViewOwnerDraw 
継承階層継承階層
System.Object
   System.EventArgs
    System.Windows.Forms.DrawListViewItemEventArgs
スレッド セーフスレッド セーフ
この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバ場合は、スレッド セーフであるとは限りません。
プラットフォームプラットフォーム
バージョン情報バージョン情報
参照参照
関連項目
DrawListViewItemEventArgs メンバ
System.Windows.Forms 名前空間
ListView
ListView.DrawItem
ListView.OwnerDraw
ListViewItem

DrawListViewItemEventArgs コンストラクタ

メモ : このコンストラクタは、.NET Framework version 2.0新しく追加されたものです。

DrawListViewItemEventArgs クラス新しインスタンス初期化します。

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

Public Sub New ( _
    graphics As Graphics, _
    item As ListViewItem, _
    bounds As Rectangle, _
    itemIndex As Integer, _
    state As ListViewItemStates _
)
Dim graphics As Graphics
Dim item As ListViewItem
Dim bounds As Rectangle
Dim itemIndex As Integer
Dim state As ListViewItemStates

Dim instance As New DrawListViewItemEventArgs(graphics,
 item, bounds, itemIndex, state)
public DrawListViewItemEventArgs (
    Graphics graphics,
    ListViewItem item,
    Rectangle bounds,
    int itemIndex,
    ListViewItemStates state
)
public:
DrawListViewItemEventArgs (
    Graphics^ graphics, 
    ListViewItem^ item, 
    Rectangle bounds, 
    int itemIndex, 
    ListViewItemStates state
)
public DrawListViewItemEventArgs (
    Graphics graphics, 
    ListViewItem item, 
    Rectangle bounds, 
    int itemIndex, 
    ListViewItemStates state
)
public function DrawListViewItemEventArgs (
    graphics : Graphics, 
    item : ListViewItem, 
    bounds : Rectangle, 
    itemIndex : int, 
    state : ListViewItemStates
)

パラメータ

graphics

描画実行される Graphics 表面

item

描画する ListViewItem。

bounds

内部描画する Rectangle

itemIndex

ListView.Items コレクション内の ListViewItemインデックス

state

描画する ListViewItem現在の状態を示す ListViewItemStates 値のビットごとの組み合わせ

プラットフォームプラットフォーム
バージョン情報バージョン情報
参照参照
関連項目
DrawListViewItemEventArgs クラス
DrawListViewItemEventArgs メンバ
System.Windows.Forms 名前空間

DrawListViewItemEventArgs プロパティ


パブリック プロパティパブリック プロパティ

  名前 説明
パブリック プロパティ Bounds 描画する ListViewItem のサイズ位置取得します
パブリック プロパティ DrawDefault ListView コントロールListViewItem既定描画使用されるかどうかを示すプロパティ取得または設定します
パブリック プロパティ Graphics ListViewItem描画使用される Graphics取得します
パブリック プロパティ Item 描画する ListViewItem取得します
パブリック プロパティ ItemIndex ListView格納する Items コレクション内における ListViewItemインデックス取得します
パブリック プロパティ State 描画する ListViewItem現在の状態取得します
参照参照

関連項目

DrawListViewItemEventArgs クラス
System.Windows.Forms 名前空間
ListView
ListView.DrawItem
ListView.OwnerDraw
ListViewItem

DrawListViewItemEventArgs メソッド


パブリック メソッドパブリック メソッド

プロテクト メソッドプロテクト メソッド
参照参照

関連項目

DrawListViewItemEventArgs クラス
System.Windows.Forms 名前空間
ListView
ListView.DrawItem
ListView.OwnerDraw
ListViewItem

DrawListViewItemEventArgs メンバ

ListView.DrawItem イベントデータ提供します

DrawListViewItemEventArgs データ型公開されるメンバを以下の表に示します


パブリック コンストラクタパブリック コンストラクタ
  名前 説明
パブリック メソッド DrawListViewItemEventArgs DrawListViewItemEventArgs クラス新しインスタンス初期化します。
パブリック プロパティパブリック プロパティ
  名前 説明
パブリック プロパティ Bounds 描画する ListViewItemサイズ位置取得します
パブリック プロパティ DrawDefault ListView コントロールListViewItem既定描画使用されるかどうかを示すプロパティ取得または設定します
パブリック プロパティ Graphics ListViewItem描画使用される Graphics取得します
パブリック プロパティ Item 描画する ListViewItem取得します
パブリック プロパティ ItemIndex ListView格納する Items コレクション内における ListViewItemインデックス取得します
パブリック プロパティ State 描画する ListViewItem現在の状態取得します
パブリック メソッドパブリック メソッド
プロテクト メソッドプロテクト メソッド
参照参照

関連項目

DrawListViewItemEventArgs クラス
System.Windows.Forms 名前空間
ListView
ListView.DrawItem
ListView.OwnerDraw
ListViewItem



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