GroupBoxRenderer Class

Definition

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.

See also

• EnableVisualStyles()
• VisualStyleState
• VisualStyleRenderer
• VisualStyleElement