ButtonRenderer Class
Definition
Important
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Provides methods used to render a button control with or without visual styles. This class cannot be inherited.
public ref class ButtonRenderer sealedpublic ref class ButtonRenderer abstract sealedpublic sealed class ButtonRendererpublic static class ButtonRenderertype ButtonRenderer = classPublic NotInheritable Class ButtonRendererPublic Class ButtonRenderer- Inheritance
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ButtonRenderer
Examples
The following code example demonstrates how to create a custom control that uses the DrawButton method to draw a button. When the button is clicked, the control draws a smaller button inside the bounds of the original button, and the control uses the DrawParentBackground method to paint over the rest of the original button.
#using <System.dll>
#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>
using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;
using namespace System::Windows::Forms::VisualStyles;
namespace ButtonRendererSample
{
public ref class CustomButton : public Control
{
private:
Rectangle clickRectangleValue;
private:
PushButtonState state;
public:
CustomButton()
{
__super::Control();
this->Size = System::Drawing::Size(100, 40);
this->Location = Point(50, 50);
this->Font = SystemFonts::IconTitleFont;
this->Text = "Click here";
clickRectangleValue = Rectangle();
state = PushButtonState::Normal;
}
// Define the bounds of the smaller pressed button.
public:
property Rectangle ClickRectangle
{
Rectangle get()
{
clickRectangleValue.X = ClientRectangle.X +
(int)(.2 * ClientRectangle.Width);
clickRectangleValue.Y = ClientRectangle.Y +
(int)(.2 * ClientRectangle.Height);
clickRectangleValue.Width = ClientRectangle.Width -
(int)(.4 * ClientRectangle.Width);
clickRectangleValue.Height = ClientRectangle.Height -
(int)(.4 * ClientRectangle.Height);
return clickRectangleValue;
}
}
// Draw the large or small button, depending on the current state.
protected:
virtual void OnPaint(PaintEventArgs^ e) override
{
__super::OnPaint(e);
// Draw the smaller pressed button image
if (state == PushButtonState::Pressed)
{
// Set the background color to the parent if visual styles
// are disabled, because DrawParentBackground will only paint
// over the control background if visual styles are enabled.
if (Application::RenderWithVisualStyles)
{
this->BackColor = Color::Azure;
}
else
{
this->BackColor = this->Parent->BackColor;
}
// If you comment out the call to DrawParentBackground,
// the background of the control will still be visible
// outside the pressed button, if visual styles are enabled.
ButtonRenderer::DrawParentBackground(e->Graphics,
ClientRectangle, this);
ButtonRenderer::DrawButton(e->Graphics, ClickRectangle,
this->Text, this->Font, true, state);
}
// Draw the bigger unpressed button image.
else
{
ButtonRenderer::DrawButton(e->Graphics, ClientRectangle,
this->Text, this->Font, false, state);
}
}
// Draw the smaller pressed button image.
protected:
virtual void OnMouseDown(MouseEventArgs^ e) override
{
__super::OnMouseDown(e);
this->Text = "Clicked!";
state = PushButtonState::Pressed;
Invalidate();
}
// Draw the button in the hot state.
protected:
virtual void OnMouseEnter(EventArgs^ e) override
{
__super::OnMouseEnter(e);
this->Text = "Click here";
state = PushButtonState::Hot;
Invalidate();
}
// Draw the button in the unpressed state.
protected:
virtual void OnMouseLeave(EventArgs^ e) override
{
__super::OnMouseLeave(e);
this->Text = "Click here";
state = PushButtonState::Normal;
Invalidate();
}
// Draw the button hot if the mouse is released on the button.
protected:
virtual void OnMouseUp(MouseEventArgs^ e) override
{
__super::OnMouseUp(e);
OnMouseEnter(e);
}
// Detect when the cursor leaves the button area while
// it is pressed.
protected:
virtual void OnMouseMove(MouseEventArgs^ e) override
{
__super::OnMouseMove(e);
// Detect when the left mouse button is down and
// the cursor has left the pressed button area.
if ((e->Button & ::MouseButtons::Left) == ::MouseButtons::Left &&
!ClientRectangle.Contains(e->Location) &&
state == PushButtonState::Pressed)
{
OnMouseLeave(e);
}
}
};
ref class Form1 : public Form
{
public:
Form1()
{
__super::Form();
CustomButton^ Button1 = gcnew CustomButton();
Controls->Add(Button1);
if (Application::RenderWithVisualStyles)
{
this->Text = "Visual Styles Enabled";
}
else
{
this->Text = "Visual Styles Disabled";
}
}
};
}
using namespace ButtonRendererSample;
[STAThread]
int main()
{
// If you do not call EnableVisualStyles below, then
// ButtonRenderer automatically detects this and draws
// the button without visual styles.
Application::EnableVisualStyles();
Application::Run(gcnew Form1());
}
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
namespace ButtonRendererSample
{
class Form1 : Form
{
public Form1()
: base()
{
CustomButton Button1 = new CustomButton();
Controls.Add(Button1);
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
// ButtonRenderer automatically detects this and draws
// the button without visual styles.
Application.EnableVisualStyles();
Application.Run(new Form1());
}
}
public class CustomButton : Control
{
private Rectangle clickRectangleValue = new Rectangle();
private PushButtonState state = PushButtonState.Normal;
public CustomButton()
: base()
{
this.Size = new Size(100, 40);
this.Location = new Point(50, 50);
this.Font = SystemFonts.IconTitleFont;
this.Text = "Click here";
}
// Define the bounds of the smaller pressed button.
public Rectangle ClickRectangle
{
get
{
clickRectangleValue.X = ClientRectangle.X +
(int)(.2 * ClientRectangle.Width);
clickRectangleValue.Y = ClientRectangle.Y +
(int)(.2 * ClientRectangle.Height);
clickRectangleValue.Width = ClientRectangle.Width -
(int)(.4 * ClientRectangle.Width);
clickRectangleValue.Height = ClientRectangle.Height -
(int)(.4 * ClientRectangle.Height);
return clickRectangleValue;
}
}
// Draw the large or small button, depending on the current state.
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
// Draw the smaller pressed button image
if (state == PushButtonState.Pressed)
{
// Set the background color to the parent if visual styles
// are disabled, because DrawParentBackground will only paint
// over the control background if visual styles are enabled.
this.BackColor = Application.RenderWithVisualStyles ?
Color.Azure : this.Parent.BackColor;
// If you comment out the call to DrawParentBackground,
// the background of the control will still be visible
// outside the pressed button, if visual styles are enabled.
ButtonRenderer.DrawParentBackground(e.Graphics,
ClientRectangle, this);
ButtonRenderer.DrawButton(e.Graphics, ClickRectangle,
this.Text, this.Font, true, state);
}
// Draw the bigger unpressed button image.
else
{
ButtonRenderer.DrawButton(e.Graphics, ClientRectangle,
this.Text, this.Font, false, state);
}
}
// Draw the smaller pressed button image.
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
this.Text = "Clicked!";
state = PushButtonState.Pressed;
Invalidate();
}
// Draw the button in the hot state.
protected override void OnMouseEnter(EventArgs e)
{
base.OnMouseEnter(e);
this.Text = "Click here";
state = PushButtonState.Hot;
Invalidate();
}
// Draw the button in the unpressed state.
protected override void OnMouseLeave(EventArgs e)
{
base.OnMouseLeave(e);
this.Text = "Click here";
state = PushButtonState.Normal;
Invalidate();
}
// Draw the button hot if the mouse is released on the button.
protected override void OnMouseUp(MouseEventArgs e)
{
base.OnMouseUp(e);
OnMouseEnter(e);
}
// Detect when the cursor leaves the button area while
// it is pressed.
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
// Detect when the left mouse button is down and
// the cursor has left the pressed button area.
if ((e.Button & MouseButtons.Left) == MouseButtons.Left &&
!ClientRectangle.Contains(e.Location) &&
state == PushButtonState.Pressed)
{
OnMouseLeave(e);
}
}
}
}
Imports System.Drawing
Imports System.Windows.Forms
Imports System.Windows.Forms.VisualStyles
Namespace ButtonRendererSample
Class Form1
Inherits Form
Public Sub New()
Dim Button1 As New CustomButton()
Controls.Add(Button1)
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
' ButtonRenderer automatically detects this and draws
' the button without visual styles.
Application.EnableVisualStyles()
Application.Run(New Form1())
End Sub
End Class
Public Class CustomButton
Inherits Control
Private clickRectangleValue As New Rectangle()
Private state As PushButtonState = PushButtonState.Normal
Public Sub New()
With Me
Size = New Size(100, 40)
Location = New Point(50, 50)
Font = SystemFonts.IconTitleFont
Text = "Click here"
End With
End Sub
' Define the bounds of the smaller pressed button.
Public ReadOnly Property ClickRectangle() As Rectangle
Get
With clickRectangleValue
.X = Me.ClientRectangle.X + CInt(0.2 * _
Me.ClientRectangle.Width)
.Y = Me.ClientRectangle.Y + CInt(0.2 * _
Me.ClientRectangle.Height)
.Width = Me.ClientRectangle.Width - _
CInt(0.4 * Me.ClientRectangle.Width)
.Height = Me.ClientRectangle.Height - _
CInt(0.4 * Me.ClientRectangle.Height)
End With
Return clickRectangleValue
End Get
End Property
' Draw the large or small button, depending on the current state.
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
MyBase.OnPaint(e)
' Draw the smaller pressed button image.
If state = PushButtonState.Pressed Then
' Set the background color to the parent if visual styles
' are disabled, because DrawParentBackground will only paint
' over the control background if visual styles are enabled.
If Application.RenderWithVisualStyles Then
Me.BackColor = Color.Azure
Else
Me.BackColor = Me.Parent.BackColor
End If
' If you comment out the call to DrawParentBackground,
' the background of the control will still be visible
' outside the pressed button, if visual styles are enabled.
ButtonRenderer.DrawParentBackground(e.Graphics, _
Me.ClientRectangle, Me)
ButtonRenderer.DrawButton(e.Graphics, ClickRectangle, _
Me.Text, Me.Font, True, state)
' Draw the bigger unpressed button image.
Else
ButtonRenderer.DrawButton(e.Graphics, Me.ClientRectangle, _
Me.Text, Me.Font, False, state)
End If
End Sub
' Draw the smaller pressed button image.
Protected Overrides Sub OnMouseDown(ByVal e As MouseEventArgs)
MyBase.OnMouseDown(e)
With Me
.Text = "Clicked!"
.state = PushButtonState.Pressed
End With
Invalidate()
End Sub
' Draw the button in the hot state.
Protected Overrides Sub OnMouseEnter(ByVal e As EventArgs)
MyBase.OnMouseEnter(e)
With Me
.Text = "Click here"
.state = PushButtonState.Hot
End With
Invalidate()
End Sub
' Draw the button in the unpressed state.
Protected Overrides Sub OnMouseLeave(ByVal e As EventArgs)
MyBase.OnMouseLeave(e)
With Me
.Text = "Click here"
.state = PushButtonState.Normal
End With
Invalidate()
End Sub
' Draw the button hot if the mouse is released on the button.
Protected Overrides Sub OnMouseUp(ByVal e As MouseEventArgs)
MyBase.OnMouseUp(e)
OnMouseEnter(e)
End Sub
' Detect when the cursor leaves the button area while it
' is pressed.
Protected Overrides Sub OnMouseMove(ByVal e As MouseEventArgs)
MyBase.OnMouseMove(e)
' Detect when the left mouse button is down and
' the cursor has left the pressed button area.
If (e.Button And MouseButtons.Left) = MouseButtons.Left And Not _
Me.ClientRectangle.Contains(e.Location) And _
state = PushButtonState.Pressed Then
OnMouseLeave(e)
End If
End Sub
End Class
End Namespace
Remarks
The ButtonRenderer class provides a set of static methods that can be used to render a button control. Rendering a control refers to drawing the user interface of a control. To draw a button, use one of the DrawButton methods. These methods provide a variety of options, such as drawing text or an image on the button.
If visual styles are enabled in the operating system and visual styles are applied to the current application, DrawButton will draw the button with the current visual style. Otherwise, DrawButton will draw the 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.PushButton 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
| DrawButton(Graphics, Rectangle, Boolean, PushButtonState) |
Draws a button control in the specified state and bounds, and with an optional focus rectangle. |
| DrawButton(Graphics, Rectangle, Image, Rectangle, Boolean, PushButtonState) |
Draws a button control in the specified state and bounds, with the specified image, and with an optional focus rectangle. |
| DrawButton(Graphics, Rectangle, PushButtonState) |
Draws a button control in the specified state and bounds. |
| DrawButton(Graphics, Rectangle, String, Font, Boolean, PushButtonState) |
Draws a button control in the specified state and bounds, with the specified text, and with an optional focus rectangle. |
| DrawButton(Graphics, Rectangle, String, Font, Image, Rectangle, Boolean, PushButtonState) |
Draws a button control in the specified state and bounds, with the specified text and image, and with an optional focus rectangle. |
| DrawButton(Graphics, Rectangle, String, Font, TextFormatFlags, Boolean, PushButtonState) |
Draws a button control in the specified state and bounds, with the specified text and text formatting, and with an optional focus rectangle. |
| DrawButton(Graphics, Rectangle, String, Font, TextFormatFlags, Image, Rectangle, Boolean, PushButtonState) |
Draws a button control in the specified state and bounds; with the specified text, text formatting, and image; and with an optional focus rectangle. |
| DrawParentBackground(Graphics, Rectangle, Control) |
Draws the background of a control's parent in the specified area. |
| IsBackgroundPartiallyTransparent(PushButtonState) |
Indicates whether the background of the button has semitransparent or alpha-blended pieces. |
Applies to
See also
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