ButtonRenderer Classe
Definição
Importante
Algumas informações se referem a produtos de pré-lançamento que podem ser substancialmente modificados antes do lançamento. A Microsoft não oferece garantias, expressas ou implícitas, das informações aqui fornecidas.
Fornece os métodos usados para renderizar um controle de botão com ou sem estilos visuais. Essa classe não pode ser herdada.
public ref class ButtonRenderer sealedpublic ref class ButtonRenderer abstract sealedpublic sealed class ButtonRendererpublic static class ButtonRenderertype ButtonRenderer = classPublic NotInheritable Class ButtonRendererPublic Class ButtonRenderer- Herança
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ButtonRenderer
Exemplos
O exemplo de código a seguir demonstra como criar um controle personalizado que usa o DrawButton método para desenhar um botão. Quando o botão é clicado, o controle desenha um botão menor dentro dos limites do botão original e o controle usa o DrawParentBackground método para pintar sobre o restante do botão original.
#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
Comentários
A ButtonRenderer classe fornece um conjunto de static métodos que podem ser usados para renderizar um controle de botão. Renderizar um controle refere-se a desenhar a interface do usuário de um controle. Para desenhar um botão, use um dos DrawButton métodos. Esses métodos fornecem uma variedade de opções, como desenhar texto ou uma imagem no botão.
Se os estilos visuais estiverem habilitados no sistema operacional e os estilos visuais forem aplicados ao aplicativo atual, DrawButton desenhará o botão com o estilo visual atual. Caso contrário, DrawButton desenhará o botão com o estilo de Windows clássico. Isso será útil se você estiver desenhando um controle personalizado que deve corresponder automaticamente à configuração de estilo visual atual do sistema operacional.
Essa classe encapsula a funcionalidade de um System.Windows.Forms.VisualStyles.VisualStyleRenderer que é definido como um dos elementos expostos pela System.Windows.Forms.VisualStyles.VisualStyleElement.Button.PushButton classe. Para obter mais informações, consulte Controles de renderização com estilos visuais.
Propriedades
| RenderMatchingApplicationState |
Obtém ou define um valor que indica se o renderizador usa o estado do aplicativo para determinar o estilo de renderização. |
Métodos
| DrawButton(Graphics, Rectangle, Boolean, PushButtonState) |
Desenha um controle de botão no estado e nos limites especificados e com um retângulo de foco opcional. |
| DrawButton(Graphics, Rectangle, Image, Rectangle, Boolean, PushButtonState) |
Desenha um controle de botão no estado e nos limites especificados, com a imagem especificada e com um retângulo de foco opcional. |
| DrawButton(Graphics, Rectangle, PushButtonState) |
Desenha um controle de botão no estado e os limites especificados. |
| DrawButton(Graphics, Rectangle, String, Font, Boolean, PushButtonState) |
Desenha um controle de botão no estado e nos limites especificados, com o texto especificado e com um retângulo de foco opcional. |
| DrawButton(Graphics, Rectangle, String, Font, Image, Rectangle, Boolean, PushButtonState) |
Desenha um controle de botão no estado e nos limites especificados, com o texto e a imagem especificados e com um retângulo de foco opcional. |
| DrawButton(Graphics, Rectangle, String, Font, TextFormatFlags, Boolean, PushButtonState) |
Desenha um controle de botão no estado e nos limites especificados, com o texto e a formatação de texto especificados e com um retângulo de foco opcional. |
| DrawButton(Graphics, Rectangle, String, Font, TextFormatFlags, Image, Rectangle, Boolean, PushButtonState) |
Desenha um controle de botão no estado e nos limites especificados, com o texto, a formatação de texto e a imagem especificados e com um retângulo de foco opcional. |
| DrawParentBackground(Graphics, Rectangle, Control) |
Desenha a tela de fundo do pai de um controle na área especificada. |
| IsBackgroundPartiallyTransparent(PushButtonState) |
Indica se a tela de fundo do botão tem partes semitransparentes ou de combinação alfa. |