Control.Region 屬性

定義

取得或設定與控制項關聯的視窗區域。Gets or sets the window region associated with the control.

public:
 property System::Drawing::Region ^ Region { System::Drawing::Region ^ get(); void set(System::Drawing::Region ^ value); };
[System.ComponentModel.Browsable(false)]
public System.Drawing.Region Region { get; set; }
member this.Region : System.Drawing.Region with get, set
Public Property Region As Region

屬性值

與控制項關聯的視窗 RegionThe window Region associated with the control.

屬性

範例

下列程式碼範例示範如何藉由建立 round 按鈕來使用 Region 屬性。The following code example demonstrates how to use the Region property by creating a round button. 若要執行範例,請將下列程式碼貼入包含名為 roundButton 的按鈕的表單中。To run the example, paste the following code in a form containing a button called roundButton. 這個範例需要 Paint 事件連接到範例中定義的事件處理常式。This example requires that the Paint event is connected to the event handler defined in the example.

private:
   // This method will change the square button to a circular button by 
   // creating a new circle-shaped GraphicsPath object and setting it 
   // to the RoundButton objects region.
   void roundButton_Paint( Object^ sender,
      System::Windows::Forms::PaintEventArgs^ e )
   {
      System::Drawing::Drawing2D::GraphicsPath^ buttonPath =
         gcnew System::Drawing::Drawing2D::GraphicsPath;
      
      // Set a new rectangle to the same size as the button's 
      // ClientRectangle property.
      System::Drawing::Rectangle newRectangle = roundButton->ClientRectangle;
      
      // Decrease the size of the rectangle.
      newRectangle.Inflate(  -10, -10 );
      
      // Draw the button's border.
      e->Graphics->DrawEllipse( System::Drawing::Pens::Black, newRectangle );
      
      // Increase the size of the rectangle to include the border.
      newRectangle.Inflate( 1, 1 );
      
      // Create a circle within the new rectangle.
      buttonPath->AddEllipse( newRectangle );
      
      // Set the button's Region property to the newly created 
      // circle region.
      roundButton->Region = gcnew System::Drawing::Region( buttonPath );
   }
// This method will change the square button to a circular button by 
// creating a new circle-shaped GraphicsPath object and setting it 
// to the RoundButton objects region.
private void roundButton_Paint(object sender, 
    System.Windows.Forms.PaintEventArgs e)
{

    System.Drawing.Drawing2D.GraphicsPath buttonPath = 
        new System.Drawing.Drawing2D.GraphicsPath();

    // Set a new rectangle to the same size as the button's 
    // ClientRectangle property.
    System.Drawing.Rectangle newRectangle = roundButton.ClientRectangle;

    // Decrease the size of the rectangle.
    newRectangle.Inflate(-10, -10);
    
    // Draw the button's border.
    e.Graphics.DrawEllipse(System.Drawing.Pens.Black, newRectangle);

    // Increase the size of the rectangle to include the border.
    newRectangle.Inflate( 1,  1);

    // Create a circle within the new rectangle.
    buttonPath.AddEllipse(newRectangle);
            
    // Set the button's Region property to the newly created 
    // circle region.
    roundButton.Region = new System.Drawing.Region(buttonPath);

}
' This method will change the square button to a circular button by 
' creating a new circle-shaped GraphicsPath object and setting it 
' to the RoundButton objects region.
Private Sub roundButton_Paint(ByVal sender As Object, _
    ByVal e As System.Windows.Forms.PaintEventArgs) Handles roundButton.Paint

    Dim buttonPath As New System.Drawing.Drawing2D.GraphicsPath

    ' Set a new rectangle to the same size as the button's 
    ' ClientRectangle property.
    Dim newRectangle As Rectangle = roundButton.ClientRectangle

    ' Decrease the size of the rectangle.
    newRectangle.Inflate(-10, -10)

    ' Draw the button's border.
    'e.Graphics.DrawEllipse(System.Drawing.Pens.Black, newRectangle)

    'Increase the size of the rectangle to include the border.
    newRectangle.Inflate(1, 1)

    ' Create a circle within the new rectangle.
    buttonPath.AddEllipse(newRectangle)
    e.Graphics.DrawPath(Pens.Black, buttonPath)
    ' Set the button's Region property to the newly created 
    ' circle region.
    roundButton.Region = New System.Drawing.Region(buttonPath)

End Sub

備註

視窗區域是在作業系統允許繪製的視窗內的圖元集合。The window region is a collection of pixels within the window where the operating system permits drawing. 作業系統不會顯示位於視窗區域外之視窗的任何部分。The operating system does not display any portion of a window that lies outside of the window region. 控制項區域的座標相對於控制項的左上角,而不是控制項的工作區。The coordinates of a control's region are relative to the upper-left corner of the control, not the client area of the control.

注意

區域包含的圖元集合可以是非連續的。The collection of pixels contained with the region can be noncontiguous.

安全性

UIPermission
適用于所有視窗,以設定此屬性值。for all windows to set this property value. 相關聯的列舉: AllWindowsAssociated enumeration: AllWindows

適用於

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