SystemInformation.VirtualScreen Propriedade
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.
Obtém os limites da tela virtual.
public:
static property System::Drawing::Rectangle VirtualScreen { System::Drawing::Rectangle get(); };public static System.Drawing.Rectangle VirtualScreen { get; }member this.VirtualScreen : System.Drawing.RectanglePublic Shared ReadOnly Property VirtualScreen As RectangleValor da propriedade
Um Rectangle que especifica o retângulo delimitador de toda a tela virtual.
Exemplos
O exemplo de código a SystemInformation seguir lista todas as propriedades da classe em um ListBox e exibe o valor atual da propriedade em um TextBox quando um item de lista é selecionado.
#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>
#using <System.dll>
using namespace System;
using namespace System::Collections;
using namespace System::ComponentModel;
using namespace System::Drawing;
using namespace System::Reflection;
using namespace System::Windows::Forms;
public ref class SystemInfoBrowserForm: public System::Windows::Forms::Form
{
private:
System::Windows::Forms::ListBox^ listBox1;
System::Windows::Forms::TextBox^ textBox1;
public:
SystemInfoBrowserForm()
{
this->SuspendLayout();
InitForm();
// Add each property of the SystemInformation class to the list box.
Type^ t = System::Windows::Forms::SystemInformation::typeid;
array<PropertyInfo^>^pi = t->GetProperties();
for ( int i = 0; i < pi->Length; i++ )
listBox1->Items->Add( pi[ i ]->Name );
textBox1->Text = String::Format( "The SystemInformation class has {0} properties.\r\n", pi->Length );
// Configure the list item selected handler for the list box to invoke a
// method that displays the value of each property.
listBox1->SelectedIndexChanged += gcnew EventHandler( this, &SystemInfoBrowserForm::listBox1_SelectedIndexChanged );
this->ResumeLayout( false );
}
private:
void listBox1_SelectedIndexChanged( Object^ /*sender*/, EventArgs^ /*e*/ )
{
// Return if no list item is selected.
if ( listBox1->SelectedIndex == -1 )
return;
// Get the property name from the list item.
String^ propname = listBox1->Text;
if ( propname->Equals( "PowerStatus" ) )
{
// Cycle and display the values of each property of the PowerStatus property.
textBox1->Text = String::Concat( textBox1->Text, "\r\nThe value of the PowerStatus property is:" );
Type^ t = System::Windows::Forms::PowerStatus::typeid;
array<PropertyInfo^>^pi = t->GetProperties();
for ( int i = 0; i < pi->Length; i++ )
{
Object^ propval = pi[ i ]->GetValue( SystemInformation::PowerStatus, nullptr );
textBox1->Text = String::Format( "{0}\r\n PowerStatus.{1} is: {2}", textBox1->Text, pi[ i ]->Name, propval );
}
}
else
{
// Display the value of the selected property of the SystemInformation type.
Type^ t = System::Windows::Forms::SystemInformation::typeid;
array<PropertyInfo^>^pi = t->GetProperties();
PropertyInfo^ prop = nullptr;
for ( int i = 0; i < pi->Length; i++ )
if ( pi[ i ]->Name == propname )
{
prop = pi[ i ];
break;
}
Object^ propval = prop->GetValue( nullptr, nullptr );
textBox1->Text = String::Format( "{0}\r\nThe value of the {1} property is: {2}", textBox1->Text, propname, propval );
}
}
void InitForm()
{
// Initialize the form settings
this->listBox1 = gcnew System::Windows::Forms::ListBox;
this->textBox1 = gcnew System::Windows::Forms::TextBox;
this->listBox1->Anchor = (System::Windows::Forms::AnchorStyles)(System::Windows::Forms::AnchorStyles::Top | System::Windows::Forms::AnchorStyles::Bottom | System::Windows::Forms::AnchorStyles::Left | System::Windows::Forms::AnchorStyles::Right);
this->listBox1->Location = System::Drawing::Point( 8, 16 );
this->listBox1->Size = System::Drawing::Size( 172, 496 );
this->listBox1->TabIndex = 0;
this->textBox1->Anchor = (System::Windows::Forms::AnchorStyles)(System::Windows::Forms::AnchorStyles::Top | System::Windows::Forms::AnchorStyles::Bottom | System::Windows::Forms::AnchorStyles::Right);
this->textBox1->Location = System::Drawing::Point( 188, 16 );
this->textBox1->Multiline = true;
this->textBox1->ScrollBars = System::Windows::Forms::ScrollBars::Vertical;
this->textBox1->Size = System::Drawing::Size( 420, 496 );
this->textBox1->TabIndex = 1;
this->ClientSize = System::Drawing::Size( 616, 525 );
this->Controls->Add( this->textBox1 );
this->Controls->Add( this->listBox1 );
this->Text = "Select a SystemInformation property to get the value of";
}
};
[STAThread]
int main()
{
Application::Run( gcnew SystemInfoBrowserForm );
}
using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Reflection;
using System.Windows.Forms;
namespace SystemInfoBrowser
{
public class SystemInfoBrowserForm : System.Windows.Forms.Form
{
private System.Windows.Forms.ListBox listBox1;
private System.Windows.Forms.TextBox textBox1;
public SystemInfoBrowserForm()
{
this.SuspendLayout();
InitForm();
// Add each property of the SystemInformation class to the list box.
Type t = typeof(System.Windows.Forms.SystemInformation);
PropertyInfo[] pi = t.GetProperties();
for( int i=0; i<pi.Length; i++ )
listBox1.Items.Add( pi[i].Name );
textBox1.Text = "The SystemInformation class has "+pi.Length.ToString()+" properties.\r\n";
// Configure the list item selected handler for the list box to invoke a
// method that displays the value of each property.
listBox1.SelectedIndexChanged += new EventHandler(listBox1_SelectedIndexChanged);
this.ResumeLayout(false);
}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
// Return if no list item is selected.
if( listBox1.SelectedIndex == -1 ) return;
// Get the property name from the list item.
string propname = listBox1.Text;
if( propname == "PowerStatus" )
{
// Cycle and display the values of each property of the PowerStatus property.
textBox1.Text += "\r\nThe value of the PowerStatus property is:";
Type t = typeof(System.Windows.Forms.PowerStatus);
PropertyInfo[] pi = t.GetProperties();
for( int i=0; i<pi.Length; i++ )
{
object propval = pi[i].GetValue(SystemInformation.PowerStatus, null);
textBox1.Text += "\r\n PowerStatus."+pi[i].Name+" is: "+propval.ToString();
}
}
else
{
// Display the value of the selected property of the SystemInformation type.
Type t = typeof(System.Windows.Forms.SystemInformation);
PropertyInfo[] pi = t.GetProperties();
PropertyInfo prop = null;
for( int i=0; i<pi.Length; i++ )
if( pi[i].Name == propname )
{
prop = pi[i];
break;
}
object propval = prop.GetValue(null, null);
textBox1.Text += "\r\nThe value of the "+propname+" property is: "+propval.ToString();
}
}
private void InitForm()
{
// Initialize the form settings
this.listBox1 = new System.Windows.Forms.ListBox();
this.textBox1 = new System.Windows.Forms.TextBox();
this.listBox1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left) | System.Windows.Forms.AnchorStyles.Right)));
this.listBox1.Location = new System.Drawing.Point(8, 16);
this.listBox1.Size = new System.Drawing.Size(172, 496);
this.listBox1.TabIndex = 0;
this.textBox1.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Right)));
this.textBox1.Location = new System.Drawing.Point(188, 16);
this.textBox1.Multiline = true;
this.textBox1.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
this.textBox1.Size = new System.Drawing.Size(420, 496);
this.textBox1.TabIndex = 1;
this.ClientSize = new System.Drawing.Size(616, 525);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.listBox1);
this.Text = "Select a SystemInformation property to get the value of";
}
[STAThread]
static void Main()
{
Application.Run(new SystemInfoBrowserForm());
}
}
}
Imports System.Collections
Imports System.ComponentModel
Imports System.Drawing
Imports System.Reflection
Imports System.Windows.Forms
Public Class SystemInfoBrowserForm
Inherits System.Windows.Forms.Form
Private listBox1 As System.Windows.Forms.ListBox
Private textBox1 As System.Windows.Forms.TextBox
Public Sub New()
Me.SuspendLayout()
InitForm()
' Add each property of the SystemInformation class to the list box.
Dim t As Type = GetType(System.Windows.Forms.SystemInformation)
Dim pi As PropertyInfo() = t.GetProperties()
Dim i As Integer
For i = 0 To pi.Length - 1
listBox1.Items.Add(pi(i).Name)
Next i
textBox1.Text = "The SystemInformation class has " + pi.Length.ToString() + " properties." + ControlChars.CrLf
' Configure the list item selected handler for the list box to invoke a
' method that displays the value of each property.
AddHandler listBox1.SelectedIndexChanged, AddressOf listBox1_SelectedIndexChanged
Me.ResumeLayout(False)
End Sub
Private Sub listBox1_SelectedIndexChanged(sender As Object, e As EventArgs)
' Return if no list item is selected.
If listBox1.SelectedIndex = - 1 Then
Return
End If
' Get the property name from the list item.
Dim propname As String = listBox1.Text
If propname = "PowerStatus" Then
' Cycle and display the values of each property of the PowerStatus property.
textBox1.Text += ControlChars.CrLf + "The value of the PowerStatus property is:"
Dim t As Type = GetType(System.Windows.Forms.PowerStatus)
Dim pi As PropertyInfo() = t.GetProperties()
Dim i As Integer
For i = 0 To pi.Length - 1
Dim propval As Object = pi(i).GetValue(SystemInformation.PowerStatus, Nothing)
textBox1.Text += ControlChars.CrLf + " PowerStatus." + pi(i).Name + " is: " + propval.ToString()
Next i
Else
' Display the value of the selected property of the SystemInformation type.
Dim t As Type = GetType(System.Windows.Forms.SystemInformation)
Dim pi As PropertyInfo() = t.GetProperties()
Dim prop As PropertyInfo = Nothing
Dim i As Integer
For i = 0 To pi.Length - 1
If pi(i).Name = propname Then
prop = pi(i)
Exit For
End If
Next i
Dim propval As Object = prop.GetValue(Nothing, Nothing)
textBox1.Text += ControlChars.CrLf + "The value of the " + propname + " property is: " + propval.ToString()
End If
End Sub
Private Sub InitForm()
' Initialize the form settings
Me.listBox1 = New System.Windows.Forms.ListBox()
Me.textBox1 = New System.Windows.Forms.TextBox()
Me.listBox1.Anchor = CType(System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left Or System.Windows.Forms.AnchorStyles.Right, System.Windows.Forms.AnchorStyles)
Me.listBox1.Location = New System.Drawing.Point(8, 16)
Me.listBox1.Size = New System.Drawing.Size(172, 496)
Me.listBox1.TabIndex = 0
Me.textBox1.Anchor = CType(System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Right, System.Windows.Forms.AnchorStyles)
Me.textBox1.Location = New System.Drawing.Point(188, 16)
Me.textBox1.Multiline = True
Me.textBox1.ScrollBars = System.Windows.Forms.ScrollBars.Vertical
Me.textBox1.Size = New System.Drawing.Size(420, 496)
Me.textBox1.TabIndex = 1
Me.ClientSize = New System.Drawing.Size(616, 525)
Me.Controls.Add(Me.textBox1)
Me.Controls.Add(Me.listBox1)
Me.Text = "Select a SystemInformation property to get the value of"
End Sub
<STAThread()> _
Shared Sub Main()
Application.Run(New SystemInfoBrowserForm())
End Sub
End Class
Comentários
A VirtualScreen propriedade indica os limites de toda a área de trabalho em um sistema de vários monitores. Você pode usar essa propriedade para determinar o espaço visual máximo disponível em um sistema que tem vários monitores instalados.
As coordenadas de posição do retângulo indicam o deslocamento de posição, em pixels, do canto superior esquerdo da área de tela virtual em relação ao canto superior esquerdo da área na tela da exibição primária. Os valores de tamanho do retângulo indicam o tamanho da área de tela virtual.
Observação
A X coordenada de posição do retângulo é negativa quando a tela virtual começa à esquerda da borda esquerda da exibição primária. A Y coordenada do retângulo é negativa quando a tela virtual é iniciada acima da borda superior da exibição primária.