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DrawItemState Enumeration
Visual Studio 2010
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 ref class Form1: public System::Windows::Forms::Form { private: System::Windows::Forms::ListBox^ listBox1; System::ComponentModel::Container^ components; public: ~Form1() { if ( components != nullptr ) { delete components; } } private: /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> void InitializeComponent() { this->listBox1 = gcnew System::Windows::Forms::ListBox; this->SuspendLayout(); // // listBox1 // this->listBox1->DrawMode = System::Windows::Forms::DrawMode::OwnerDrawVariable; this->listBox1->Location = System::Drawing::Point( 16, 48 ); this->listBox1->Name = "listBox1"; this->listBox1->SelectionMode = System::Windows::Forms::SelectionMode::MultiExtended; this->listBox1->Size = System::Drawing::Size( 256, 134 ); this->listBox1->TabIndex = 0; this->listBox1->MeasureItem += gcnew System::Windows::Forms::MeasureItemEventHandler( this, &Form1::listBox1_MeasureItem ); this->listBox1->DrawItem += gcnew System::Windows::Forms::DrawItemEventHandler( this, &Form1::listBox1_DrawItem ); // // Form1 // this->ClientSize = System::Drawing::Size( 292, 273 ); array<System::Windows::Forms::Control^>^temp0 = {this->listBox1}; this->Controls->AddRange( temp0 ); this->Name = "Form1"; this->Text = "Form1"; this->ResumeLayout( false ); } void listBox1_MeasureItem( Object^ /*sender*/, MeasureItemEventArgs^ e ) { System::Drawing::Font^ font = (dynamic_cast<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. SolidBrush^ foreColorBrush; void listBox1_DrawItem( Object^ /*sender*/, DrawItemEventArgs^ e ) { Brush^ brush; // Create the brush using the ForeColor specified by the DrawItemEventArgs if ( foreColorBrush == nullptr ) foreColorBrush = gcnew 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. delete foreColorBrush; foreColorBrush = gcnew 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. System::Drawing::Font^ font = (dynamic_cast<ListBoxFontItem^>(listBox1->Items[ e->Index ]))->Font; e->DrawBackground(); e->Graphics->DrawString( font->Name, font, brush, e->Bounds ); e->DrawFocusRectangle(); } public: /// <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> ref class ListBoxFontItem { public: System::Drawing::Font^ Font; ListBoxFontItem( System::Drawing::Font^ f ) { Font = f; } virtual String^ ToString() override { return Font->Name; } }; }; [STAThread] int main() { Application::Run( gcnew Form1 ); }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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