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GroupBoxRenderer Class

  • Reference

Definition

Namespace:
System.Windows.Forms
Assembly:
System.Windows.Forms.dll

Provides methods used to render a group box control with or without visual styles. This class cannot be inherited.

public ref class GroupBoxRenderer sealed
public ref class GroupBoxRenderer abstract sealed
public sealed class GroupBoxRenderer
public static class GroupBoxRenderer
type GroupBoxRenderer = class
Public NotInheritable Class GroupBoxRenderer
Public Class GroupBoxRenderer
Inheritance
Object
GroupBoxRenderer

Examples

The following code example demonstrates how to create a custom control that uses the DrawGroupBox method to draw a group box with a double border if visual styles are enabled.

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

using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;
using namespace System::Windows::Forms::VisualStyles;

namespace GroupBoxRendererSample
{
    public ref class CustomGroupBox : public Control
    {
    private:
        Rectangle innerRectangle;
    private:
        GroupBoxState state;
    private:
        FlowLayoutPanel^ panel;

    public:
        CustomGroupBox() : Control()
        {
            innerRectangle = Rectangle();
            state = GroupBoxState::Normal;
            panel = gcnew FlowLayoutPanel();

            this->Size = System::Drawing::Size(200, 200);
            this->Location = Point(10, 10);
            this->Controls->Add(panel);
            this->Text = "CustomGroupBox";
            this->Font = SystemFonts::IconTitleFont;

            innerRectangle.X = ClientRectangle.X + 5;
            innerRectangle.Y = ClientRectangle.Y + 15;
            innerRectangle.Width = ClientRectangle.Width - 10;
            innerRectangle.Height = ClientRectangle.Height - 20;

            panel->FlowDirection = FlowDirection::TopDown;
            panel->Location = Point(innerRectangle.X + 5,
                innerRectangle.Y + 5);
            panel->Size = System::Drawing::Size(innerRectangle.Width - 10,
                innerRectangle.Height - 10);
        }

        // Draw the group box in the current state.
    protected:
        virtual void OnPaint(PaintEventArgs^ e) override 
        {
            __super::OnPaint(e);

            GroupBoxRenderer::DrawGroupBox(e->Graphics, ClientRectangle,
                this->Text, this->Font, state);

            // Draw an additional inner border if visual styles are enabled.
            if (Application::RenderWithVisualStyles)
            {
                GroupBoxRenderer::DrawGroupBox(e->Graphics, innerRectangle,
                    state);
            }
        }

        // Pass added controls to the internal FlowLayoutPanel.
    protected:
        virtual void OnControlAdded(ControlEventArgs^ e) override
        {
            __super::OnControlAdded(e);

            // Ensure that you do not add the panel itself.
            if (e->Control != this->panel)
            {
                this->Controls->Remove(e->Control);
                panel->Controls->Add(e->Control);
            }
        }
    };

    ref class Form1 : public Form
    {
    public:
        Form1() : Form()
        {
            CustomGroupBox^ groupBox1 = gcnew CustomGroupBox();
            groupBox1->Text = "Radio Button Display";
            Controls->Add(groupBox1);

            // Add some radio buttons to test the CustomGroupBox.
            int count = 8;
            array<RadioButton^>^ buttonArray = 
                gcnew array<RadioButton^>(count);
            for (int i = 0; i < count; i++)
            {
                buttonArray[i] = gcnew RadioButton();
                buttonArray[i]->Text = "Button " + (i + 1).ToString();
                groupBox1->Controls->Add(buttonArray[i]);
            }

            if (Application::RenderWithVisualStyles)
            {
                this->Text = "Visual Styles Enabled";
            }
            else
            {
                this->Text = "Visual Styles Disabled";
            }
        }
    };
}

[STAThread]
int main()
{
    // If you do not call EnableVisualStyles below, then
    // GroupBoxRenderer automatically detects this and draws
    // the group box without visual styles.
    Application::EnableVisualStyles();
    Application::Run(gcnew GroupBoxRendererSample::Form1());
}

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

namespace GroupBoxRendererSample
{
    class Form1 : Form
    {
        private Button button1;
    
        public Form1()
            : base()
        {
            CustomGroupBox GroupBox1 = new CustomGroupBox();
            button1 = new Button();
             
            GroupBox1.Text = "Radio Button Display";
            this.button1.Location = new System.Drawing.Point(205, 231);
            this.button1.Size = new System.Drawing.Size(105, 23);
            this.button1.Text = "Toggle Visual Styles";
            this.button1.Click += new System.EventHandler(this.button1_Click);
            Controls.Add(GroupBox1);
            this.Controls.Add(this.button1);

            // Add some radio buttons to test the CustomGroupBox.
            int count = 8;
            RadioButton[] ButtonArray = new RadioButton[count];
            for (int i = 0; i < count; i++)
            {
                ButtonArray[i] = new RadioButton();
                ButtonArray[i].Text = "Button " + (i + 1).ToString();
                GroupBox1.Controls.Add(ButtonArray[i]);
            }

            if (Application.RenderWithVisualStyles)
                this.Text = "Visual Styles Enabled";
            else
                this.Text = "Visual Styles Disabled";
        }

        [STAThread]
        static void Main()
        {
            // If you do not call EnableVisualStyles below, then 
            // GroupBoxRenderer automatically detects this and draws
            // the group box without visual styles.
            Application.EnableVisualStyles();
            Application.Run(new Form1());
        }


    // Match application style and toggle visual styles off
    // and on for the application.
        private void button1_Click(object sender, EventArgs e)
        {
            GroupBoxRenderer.RenderMatchingApplicationState = true;
            Application.VisualStyleState = 
                Application.VisualStyleState ^ 
                VisualStyleState.ClientAndNonClientAreasEnabled;

            if (Application.RenderWithVisualStyles)
                this.Text = "Visual Styles Enabled";
            else
                this.Text = "Visual Styles Disabled";
        }
    }

    public class CustomGroupBox : Control
    {
        private Rectangle innerRectangle = new Rectangle();
        private GroupBoxState state = GroupBoxState.Normal;
        private FlowLayoutPanel panel = new FlowLayoutPanel();

        public CustomGroupBox()
            : base()
        {
            this.Size = new Size(200, 200);
            this.Location = new Point(10, 10);
            this.Controls.Add(panel);
            this.Text = "CustomGroupBox";
            this.Font = SystemFonts.IconTitleFont;

            innerRectangle.X = ClientRectangle.X + 5;
            innerRectangle.Y = ClientRectangle.Y + 15;
            innerRectangle.Width = ClientRectangle.Width - 10;
            innerRectangle.Height = ClientRectangle.Height - 20;

            panel.FlowDirection = FlowDirection.TopDown;
            panel.Location = new Point(innerRectangle.X + 5,
                innerRectangle.Y + 5);
            panel.Size = new Size(innerRectangle.Width - 10,
                innerRectangle.Height - 10);
        }

        // Draw the group box in the current state.
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);

            GroupBoxRenderer.DrawGroupBox(e.Graphics, ClientRectangle,
                this.Text, this.Font, state);

            // Draw an additional inner border if visual styles are enabled.
            if (Application.RenderWithVisualStyles)
            {
                GroupBoxRenderer.DrawGroupBox(e.Graphics, innerRectangle, state);
            }
        }

        // Pass added controls to the internal FlowLayoutPanel.
        protected override void OnControlAdded(ControlEventArgs e)
        {
            base.OnControlAdded(e);

            // Ensure that you do not add the panel itself.
            if (e.Control != this.panel)
            {
                this.Controls.Remove(e.Control);
                panel.Controls.Add(e.Control);
            }
        }
    }
}

Imports System.Drawing
Imports System.Windows.Forms
Imports System.Windows.Forms.VisualStyles



Class Form1
    Inherits Form
    Private WithEvents button1 As Button
    
    
    Public Sub New() 
        Dim GroupBox1 As New CustomGroupBox()
        button1 = New Button()
        
        GroupBox1.Text = "Radio Button Display"
        Me.button1.Location = New System.Drawing.Point(185, 231)
        Me.button1.Size = New System.Drawing.Size(105, 23)
        Me.button1.Text = "Toggle Visual Styles"

        Controls.Add(GroupBox1)
        Me.Controls.Add(Me.button1)
        
        ' Add some radio buttons to test the CustomGroupBox.
        Dim count As Integer = 8
        Dim ButtonArray(count) As RadioButton
        For i = 0 To count - 1
            ButtonArray(i) = New RadioButton()
            ButtonArray(i).Text = "Button " +(i + 1).ToString()
            GroupBox1.Controls.Add(ButtonArray(i))
        Next
        
        If Application.RenderWithVisualStyles Then
            Me.Text = "Visual Styles Enabled"
        Else
            Me.Text = "Visual Styles Disabled"
        End If
    
    End Sub
     
    <STAThread()>  _
    Shared Sub Main() 
        ' If you do not call EnableVisualStyles below, then 
        ' GroupBoxRenderer automatically detects this and draws
        ' the group box without visual styles.
        Application.EnableVisualStyles()
        Application.Run(New Form1())
    
    End Sub
    
    
    ' Match application style and toggle visual styles off
    ' and on for the application.
    Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) _
        Handles button1.Click

        GroupBoxRenderer.RenderMatchingApplicationState = True

        Application.VisualStyleState = _
            Application.VisualStyleState Xor _
            VisualStyleState.ClientAndNonClientAreasEnabled

        If Application.RenderWithVisualStyles Then
            Me.Text = "Visual Styles Enabled"
        Else
            Me.Text = "Visual Styles Disabled"
        End If

    End Sub
End Class


Public Class CustomGroupBox
    Inherits Control
    Private innerRectangle As New Rectangle()
    Private state As GroupBoxState = GroupBoxState.Normal
    Private panel As New FlowLayoutPanel()
    
    
    Public Sub New() 
        Me.Size = New Size(200, 200)
        Me.Location = New Point(10, 10)
        Me.Controls.Add(panel)
        Me.Text = "CustomGroupBox"
        Me.Font = SystemFonts.IconTitleFont
        
        innerRectangle.X = ClientRectangle.X + 5
        innerRectangle.Y = ClientRectangle.Y + 15
        innerRectangle.Width = ClientRectangle.Width - 10
        innerRectangle.Height = ClientRectangle.Height - 20
        
        panel.FlowDirection = FlowDirection.TopDown
        panel.Location = New Point(innerRectangle.X + 5, innerRectangle.Y + 5)
        panel.Size = New Size(innerRectangle.Width - 10, innerRectangle.Height - 10)
    
    End Sub
    
    
    ' Draw the group box in the current state.
    Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs) 
        MyBase.OnPaint(e)
        
        GroupBoxRenderer.DrawGroupBox(e.Graphics, ClientRectangle, Me.Text, Me.Font, state)
        
        ' Draw an additional inner border if visual styles are enabled.
        If Application.RenderWithVisualStyles Then
            GroupBoxRenderer.DrawGroupBox(e.Graphics, innerRectangle, state)
        End If
    
    End Sub
    
    ' Pass added controls to the internal FlowLayoutPanel.
    Protected Overrides Sub OnControlAdded(ByVal e As ControlEventArgs) 
        MyBase.OnControlAdded(e)
        
        ' Ensure that you do not add the panel itself.
        If e.Control IsNot Me.panel Then
            Me.Controls.Remove(e.Control)
            panel.Controls.Add(e.Control)
        End If
    
    End Sub
End Class

Remarks

The GroupBoxRenderer class provides a set of static methods that can be used to render a group box control. Rendering a control refers to drawing the user interface of a control. To draw a group box, use one of the DrawGroupBox methods. These methods provide a variety of text drawing options.

If visual styles are enabled in the operating system and visual styles are applied to the current application, DrawGroupBox will draw the group box with the current visual style. Otherwise, DrawGroupBox will draw the group box with the classic Windows style. This is useful if you are drawing a custom control that should automatically match the current visual style setting of the operating system.

This class wraps the functionality of a System.Windows.Forms.VisualStyles.VisualStyleRenderer that is set to one of the elements exposed by the System.Windows.Forms.VisualStyles.VisualStyleElement.Button.GroupBox class. For more information, see Rendering Controls with Visual Styles.

Properties

RenderMatchingApplicationState

Gets or sets a value indicating whether the renderer uses the application state to determine rendering style.

Methods

DrawGroupBox(Graphics, Rectangle, GroupBoxState)

Draws a group box control in the specified state and bounds.
DrawGroupBox(Graphics, Rectangle, String, Font, Color, GroupBoxState)

Draws a group box control in the specified state and bounds, with the specified text, font, and color.
DrawGroupBox(Graphics, Rectangle, String, Font, Color, TextFormatFlags, GroupBoxState)

Draws a group box control in the specified state and bounds, with the specified text, font, color, and text formatting.
DrawGroupBox(Graphics, Rectangle, String, Font, GroupBoxState)

Draws a group box control in the specified state and bounds, with the specified text and font.
DrawGroupBox(Graphics, Rectangle, String, Font, TextFormatFlags, GroupBoxState)

Draws a group box control in the specified state and bounds, with the specified text, font, and text formatting.
DrawParentBackground(Graphics, Rectangle, Control)

Draws the background of a control's parent in the specified area.
IsBackgroundPartiallyTransparent(GroupBoxState)

Indicates whether the background of the group box has any semitransparent or alpha-blended pieces.

Applies to

See also