RadioButtonRenderer Class

 

Provides methods used to render an option button control (also known as a radio button) with or without visual styles. This class cannot be inherited.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

System::Object
  System.Windows.Forms::RadioButtonRenderer

public ref class RadioButtonRenderer sealed 

NameDescription
System_CAPS_pubpropertySystem_CAPS_staticRenderMatchingApplicationState

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

NameDescription
System_CAPS_pubmethodSystem_CAPS_staticDrawParentBackground(Graphics^, Rectangle, Control^)

Draws the background of a control's parent in the specified area.

System_CAPS_pubmethodSystem_CAPS_staticDrawRadioButton(Graphics^, Point, RadioButtonState)

Draws an option button control (also known as a radio button) in the specified state and location.

System_CAPS_pubmethodSystem_CAPS_staticDrawRadioButton(Graphics^, Point, Rectangle, String^, Font^, Boolean, RadioButtonState)

Draws an option button control (also known as a radio button) in the specified state and location, with the specified text, and with an optional focus rectangle.

System_CAPS_pubmethodSystem_CAPS_staticDrawRadioButton(Graphics^, Point, Rectangle, String^, Font^, Image^, Rectangle, Boolean, RadioButtonState)

Draws an option button control (also known as a radio button) in the specified state and location, with the specified text and image, and with an optional focus rectangle.

System_CAPS_pubmethodSystem_CAPS_staticDrawRadioButton(Graphics^, Point, Rectangle, String^, Font^, TextFormatFlags, Boolean, RadioButtonState)

Draws an option button control (also known as a radio button) in the specified state and location, with the specified text and text formatting, and with an optional focus rectangle.

System_CAPS_pubmethodSystem_CAPS_staticDrawRadioButton(Graphics^, Point, Rectangle, String^, Font^, TextFormatFlags, Image^, Rectangle, Boolean, RadioButtonState)

Draws an option button control (also known as a radio button) in the specified state and location; with the specified text, text formatting, and image; and with an optional focus rectangle.

System_CAPS_pubmethodEquals(Object^)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_pubmethodSystem_CAPS_staticGetGlyphSize(Graphics^, RadioButtonState)

Returns the size, in pixels, of the option button (also known as a radio button) glyph.

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethodSystem_CAPS_staticIsBackgroundPartiallyTransparent(RadioButtonState)

Indicates whether the background of the option button (also known as a radio button) has semitransparent or alpha-blended pieces.

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

The RadioButtonRenderer class provides a set of static methods that can be used to render an option button control. Rendering a control refers to drawing the user interface of a control. To draw an option button, use one of the DrawRadioButton methods. These methods provide a variety of options, such as drawing text or an image with the option button.

If visual styles are enabled in the operating system and visual styles are applied to the current application, DrawRadioButton will draw the option button with the current visual style. Otherwise, DrawRadioButton will draw the option button 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::RadioButton class. For more information, see Rendering Controls with Visual Styles.

WinXpFamily

Visual styles are supported only on these platforms.

The following code example demonstrates how to write a custom control that uses the DrawRadioButton method to draw an option button that responds to mouse clicks.

#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 RadioButtonRendererSample
{
    public ref class CustomRadioButton : public Control
    {
    private:
        Rectangle textRectangleValue;
    private:
        bool clicked;
    private:
        RadioButtonState state;

    public:
        CustomRadioButton() : Control()
        {
            textRectangleValue = Rectangle();
            state = RadioButtonState::UncheckedNormal;
            this->Location = Point(50, 50);
            this->Size = System::Drawing::Size(100, 20);
            this->Text = "Click here";
            this->Font = SystemFonts::IconTitleFont;
        }

        // Define the text bounds so that the text rectangle
        // does not include the radio button.
    public:
        property Rectangle TextRectangle
        {
            Rectangle get()
            {
                Graphics^ g = this->CreateGraphics();

                textRectangleValue.X = ClientRectangle.X +
                    RadioButtonRenderer::GetGlyphSize(g,
                    RadioButtonState::UncheckedNormal).Width;
                textRectangleValue.Y = ClientRectangle.Y;
                textRectangleValue.Width = ClientRectangle.Width -
                    RadioButtonRenderer::GetGlyphSize(g,
                    RadioButtonState::UncheckedNormal).Width;
                textRectangleValue.Height = ClientRectangle.Height;

                delete g;                

                return textRectangleValue;
            }
        }

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

            RadioButtonRenderer::DrawRadioButton(e->Graphics,
                ClientRectangle.Location, TextRectangle, this->Text,
                this->Font, clicked, state);
        }

        // Draw the radio button in the checked or unchecked state.
    protected:
        virtual void OnMouseDown(MouseEventArgs^ e) override
        {
            __super::OnMouseDown(e);

            if (!clicked)
            {
                clicked = true;
                this->Text = "Clicked!";
                state = RadioButtonState::CheckedPressed;
                Invalidate();
            }
            else
            {
                clicked = false;
                this->Text = "Click here";
                state = RadioButtonState::UncheckedNormal;
                Invalidate();
            }
        }

        // Draw the radio button in the hot state.
    protected:
        virtual void OnMouseHover(EventArgs^ e) override
        {
            __super::OnMouseHover(e);
            state = clicked ? RadioButtonState::CheckedHot :
                RadioButtonState::UncheckedHot;
            Invalidate();
        }

        // Draw the radio button in the hot state.
    protected:
        virtual void OnMouseUp(MouseEventArgs^ e) override
        {
            __super::OnMouseUp(e);
            this->OnMouseHover(e);
        }

        // Draw the radio button in the normal (i.e. not hot) state
    protected:
        virtual void OnMouseLeave(EventArgs^ e) override
        {
            __super::OnMouseLeave(e);
            state = clicked ? RadioButtonState::CheckedNormal :
                RadioButtonState::UncheckedNormal;
            Invalidate();
        }
    };

    public ref class Form1 : public Form
    {
    public:
        Form1() : Form()
        {
            Controls->Add(gcnew CustomRadioButton());

            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
    // RadioButtonRenderer.DrawRadioButton automatically detects
    // this and draws the radio button without visual styles.
    Application::EnableVisualStyles();
    Application::Run(gcnew RadioButtonRendererSample::Form1());
}

.NET Framework
Available since 2.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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