DrawItemState Enumeration
.NET Framework 3.5
Specifies the state of an item that is being drawn.
This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.
Namespace: System.Windows.FormsAssembly: System.Windows.Forms (in System.Windows.Forms.dll)
| Member name | Description | |
|---|---|---|
| Checked | The item is checked. Only menu controls use this value. | |
| ComboBoxEdit | The item is the editing portion of a ComboBox. | |
| Default | The item is in its default visual state. | |
| Disabled | The item is unavailable. | |
| Focus | The item has focus. | |
| Grayed | The item is grayed. Only menu controls use this value. | |
| HotLight | The item is being hot-tracked, that is, the item is highlighted as the mouse pointer passes over it. | |
| Inactive | The item is inactive. | |
| NoAccelerator | The item displays without a keyboard accelerator. | |
| NoFocusRect | The item displays without the visual cue that indicates it has focus. | |
| Selected | The item is selected. | |
| None | The item currently has no state. |
This enumeration is used by members such as DrawItemEventArgs.State.
The following code example demonstrates using the Graphics property to perform custom drawing of the items in a ListBox.
public class Form1 : System.Windows.Forms.Form { private System.Windows.Forms.ListBox listBox1; private System.ComponentModel.Container components = null; protected override void Dispose(bool disposing) { if( disposing ) { if ( components != null ) components.Dispose(); if ( foreColorBrush != null ) foreColorBrush.Dispose(); } base.Dispose(disposing); } #region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.listBox1 = new System.Windows.Forms.ListBox(); this.SuspendLayout(); // // listBox1 // this.listBox1.DrawMode = System.Windows.Forms.DrawMode.OwnerDrawVariable; this.listBox1.Location = new System.Drawing.Point(16, 48); this.listBox1.Name = "listBox1"; this.listBox1.SelectionMode = System.Windows.Forms.SelectionMode.MultiExtended; this.listBox1.Size = new System.Drawing.Size(256, 134); this.listBox1.TabIndex = 0; this.listBox1.MeasureItem += new System.Windows.Forms.MeasureItemEventHandler(this.listBox1_MeasureItem); this.listBox1.DrawItem += new System.Windows.Forms.DrawItemEventHandler(this.listBox1_DrawItem); // // Form1 // this.ClientSize = new System.Drawing.Size(292, 273); this.Controls.AddRange(new System.Windows.Forms.Control[] { this.listBox1}); this.Name = "Form1"; this.Text = "Form1"; this.ResumeLayout(false); } #endregion [STAThread] static void Main() { Application.Run(new Form1()); } private void listBox1_MeasureItem(object sender, System.Windows.Forms.MeasureItemEventArgs e) { Font font = ((ListBoxFontItem)listBox1.Items[e.Index]).Font; SizeF stringSize = e.Graphics.MeasureString(font.Name, font); // Set the height and width of the item e.ItemHeight = (int)stringSize.Height; e.ItemWidth = (int)stringSize.Width; } // For efficiency, cache the brush to use for drawing. private SolidBrush foreColorBrush; private void listBox1_DrawItem(object sender, System.Windows.Forms.DrawItemEventArgs e) { Brush brush; // Create the brush using the ForeColor specified by the DrawItemEventArgs if ( foreColorBrush == null ) foreColorBrush = new SolidBrush(e.ForeColor); else if ( foreColorBrush.Color != e.ForeColor ) { // The control's ForeColor has changed, so dispose of the cached brush and // create a new one. foreColorBrush.Dispose(); foreColorBrush = new SolidBrush(e.ForeColor); } // Select the appropriate brush depending on if the item is selected. // Since State can be a combinateion (bit-flag) of enum values, you can't use // "==" to compare them. if ( (e.State & DrawItemState.Selected) == DrawItemState.Selected ) brush = SystemBrushes.HighlightText; else brush = foreColorBrush; // Perform the painting. Font font = ((ListBoxFontItem)listBox1.Items[e.Index]).Font; e.DrawBackground(); e.Graphics.DrawString(font.Name, font, brush, e.Bounds); e.DrawFocusRectangle(); } /// <summary> /// A wrapper class for use with storing Fonts in a ListBox. Since ListBox uses the /// ToString() of its items for the text it displays, this class is needed to return /// the name of the font, rather than its ToString() value. /// </summary> public class ListBoxFontItem { public Font Font; public ListBoxFontItem(Font f) { Font = f; } public override string ToString() { return Font.Name; } } }
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
