ButtonRenderer Classe
Definizione
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Fornisce i metodi utilizzati per eseguire il rendering di un controllo pulsante con o senza stili di visualizzazione. La classe non può essere ereditata.
public ref class ButtonRenderer sealedpublic ref class ButtonRenderer abstract sealedpublic sealed class ButtonRendererpublic static class ButtonRenderertype ButtonRenderer = classPublic NotInheritable Class ButtonRendererPublic Class ButtonRenderer- Ereditarietà
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ButtonRenderer
Esempio
Nell'esempio di codice seguente viene illustrato come creare un controllo personalizzato che usa il DrawButton metodo per disegnare un pulsante. Quando si fa clic sul pulsante, il controllo disegna un pulsante più piccolo all'interno dei limiti del pulsante originale e il controllo usa il DrawParentBackground metodo per disegnare il resto del pulsante originale.
#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
Commenti
La ButtonRenderer classe fornisce un set di metodi che possono essere usati per eseguire il rendering di static un controllo pulsante. Il rendering di un controllo si riferisce alla grafica dell'interfaccia utente di un controllo. Per disegnare un pulsante, usare uno dei DrawButton metodi. Questi metodi forniscono una varietà di opzioni, ad esempio il testo di disegno o un'immagine sul pulsante.
Se gli stili di visualizzazione sono abilitati nel sistema operativo e gli stili di visualizzazione vengono applicati all'applicazione corrente, DrawButton disegnare il pulsante con lo stile di visualizzazione corrente. In caso contrario, DrawButton disegnare il pulsante con lo stile classico Windows. Questo è utile se si disegna un controllo personalizzato che deve corrispondere automaticamente all'impostazione dello stile di visualizzazione corrente del sistema operativo.
Questa classe esegue il wrapping della funzionalità di un System.Windows.Forms.VisualStyles.VisualStyleRenderer oggetto impostato su uno degli elementi esposti dalla System.Windows.Forms.VisualStyles.VisualStyleElement.Button.PushButton classe. Per altre informazioni, vedere Controlli di rendering con stili di visualizzazione.
Proprietà
| RenderMatchingApplicationState |
Ottiene o imposta un valore che indica se il renderer utilizza lo stato dell'applicazione per determinare lo stile di rendering. |
Metodi
| DrawButton(Graphics, Rectangle, Boolean, PushButtonState) |
Disegna un controllo pulsante nello stato e nei limiti specificati, eventualmente con un rettangolo di attivazione. |
| DrawButton(Graphics, Rectangle, Image, Rectangle, Boolean, PushButtonState) |
Disegna un controllo pulsante nello stato e nei limiti specificati, con l'immagine specificata ed eventualmente con un rettangolo di attivazione. |
| DrawButton(Graphics, Rectangle, PushButtonState) |
Disegna un controllo pulsante nello stato e nei limiti specificati. |
| DrawButton(Graphics, Rectangle, String, Font, Boolean, PushButtonState) |
Disegna un controllo pulsante nello stato e nei limiti specificati, con il testo specificato ed eventualmente con un rettangolo di attivazione. |
| DrawButton(Graphics, Rectangle, String, Font, Image, Rectangle, Boolean, PushButtonState) |
Disegna un controllo pulsante nello stato e nei limiti specificati, con il testo e l'immagine specificati ed eventualmente con un rettangolo di attivazione. |
| DrawButton(Graphics, Rectangle, String, Font, TextFormatFlags, Boolean, PushButtonState) |
Disegna un controllo pulsante nello stato e nei limiti specificati, con il testo e la formattazione specificati ed eventualmente con un rettangolo di attivazione. |
| DrawButton(Graphics, Rectangle, String, Font, TextFormatFlags, Image, Rectangle, Boolean, PushButtonState) |
Disegna un controllo pulsante nello stato e nei limiti specificati, con il testo, la formattazione e l'immagine specificati ed eventualmente con un rettangolo di attivazione. |
| DrawParentBackground(Graphics, Rectangle, Control) |
Disegna lo sfondo dell'elemento padre di un controllo nell'area specificata. |
| IsBackgroundPartiallyTransparent(PushButtonState) |
Indica se lo sfondo del pulsante controllo contiene aree semitrasparenti o con alpha blending. |