Control.RectangleToScreen 方法

计算指定工作区矩形的大小和位置（以屏幕坐标表示）。

**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms（在 system.windows.forms.dll 中）

语法

声明
Public Function RectangleToScreen ( _
    r As Rectangle _
) As Rectangle
用法
Dim instance As Control
Dim r As Rectangle
Dim returnValue As Rectangle

returnValue = instance.RectangleToScreen(r)

public Rectangle RectangleToScreen (
    Rectangle r
)

public:
Rectangle RectangleToScreen (
    Rectangle r
)

public Rectangle RectangleToScreen (
    Rectangle r
)

public function RectangleToScreen (
    r : Rectangle
) : Rectangle

参数

• r
  要转换的屏幕坐标 Rectangle。

返回值

一个 Rectangle，它表示转换后的 Rectangle、p（以屏幕坐标表示）。

示例

下面的代码示例演示如何使用 BackColor、RectangleToScreen、PointToScreen、MouseButtons、ControlPaint.DrawReversibleFrame 和 Rectangle.IntersectsWith 成员。要运行该示例，请将以下代码粘贴到一个包含多个控件的称为 Form1 的窗体中。此示例要求 MouseDown、MouseMove 和 MouseUp 事件已连接到该示例中定义的事件处理程序。

' The following three methods will draw a rectangle and allow 
' the user to use the mouse to resize the rectangle.  If the 
' rectangle intersects a control's client rectangle, the 
' control's color will change.

Dim isDrag As Boolean = False
Dim theRectangle As New rectangle(New Point(0, 0), New Size(0, 0))
Dim startPoint As Point

Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As _
    System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseDown

    ' Set the isDrag variable to true and get the starting point 
    ' by using the PointToScreen method to convert form coordinates to
    ' screen coordinates.
    If (e.Button = MouseButtons.Left) Then
        isDrag = True
    End If

    Dim control As Control = CType(sender, Control)

    ' Calculate the startPoint by using the PointToScreen 
    ' method.
    startPoint = control.PointToScreen(New Point(e.X, e.Y))
End Sub

Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As _
System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseMove

    ' If the mouse is being dragged, undraw and redraw the rectangle
    ' as the mouse moves.
    If (isDrag) Then

        ' Hide the previous rectangle by calling the DrawReversibleFrame 
        ' method with the same parameters.
        ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, _
            FrameStyle.Dashed)

        ' Calculate the endpoint and dimensions for the new rectangle, 
        ' again using the PointToScreen method.
        Dim endPoint As Point = Me.PointToScreen(New Point(e.X, e.Y))
        Dim width As Integer = endPoint.X - startPoint.X
        Dim height As Integer = endPoint.Y - startPoint.Y
        theRectangle = New Rectangle(startPoint.X, startPoint.Y, _
            width, height)

        ' Draw the new rectangle by calling DrawReversibleFrame again.  
        ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, _
             FrameStyle.Dashed)
    End If
End Sub

Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As _
System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseUp

    ' If the MouseUp event occurs, the user is not dragging.
    isDrag = False

    ' Draw the rectangle to be evaluated. Set a dashed frame style 
    ' using the FrameStyle enumeration.
    ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, _
        FrameStyle.Dashed)

    ' Find out which controls intersect the rectangle and change their color.
    ' The method uses the RectangleToScreen method to convert the 
    ' Control's client coordinates to screen coordinates.
    Dim i As Integer
    Dim controlRectangle As Rectangle
    For i = 0 To Controls.Count - 1
        controlRectangle = Controls(i).RectangleToScreen _
            (Controls(i).ClientRectangle)
        If controlRectangle.IntersectsWith(theRectangle) Then
            Controls(i).BackColor = Color.BurlyWood
        End If
    Next

    ' Reset the rectangle.
    theRectangle = New Rectangle(0, 0, 0, 0)
End Sub

// The following three methods will draw a rectangle and allow 
// the user to use the mouse to resize the rectangle.  If the 
// rectangle intersects a control's client rectangle, the 
// control's color will change.

bool isDrag = false;
Rectangle theRectangle = new Rectangle
    (new Point(0, 0), new Size(0, 0));
Point startPoint;

private void Form1_MouseDown(object sender, 
    System.Windows.Forms.MouseEventArgs e)
{

    // Set the isDrag variable to true and get the starting point 
    // by using the PointToScreen method to convert form 
    // coordinates to screen coordinates.
    if (e.Button==MouseButtons.Left)
    {
        isDrag = true;
    }

    Control control = (Control) sender;

    // Calculate the startPoint by using the PointToScreen 
    // method.
    startPoint = control.PointToScreen(new Point(e.X, e.Y));
}

private void Form1_MouseMove(object sender, 
    System.Windows.Forms.MouseEventArgs e)
{

    // If the mouse is being dragged, 
    // undraw and redraw the rectangle as the mouse moves.
    if (isDrag)

        // Hide the previous rectangle by calling the 
        // DrawReversibleFrame method with the same parameters.
    {
        ControlPaint.DrawReversibleFrame(theRectangle, 
            this.BackColor, FrameStyle.Dashed);

        // Calculate the endpoint and dimensions for the new 
        // rectangle, again using the PointToScreen method.
        Point endPoint = this.PointToScreen(new Point(e.X, e.Y));
        int width = endPoint.X-startPoint.X;
        int height = endPoint.Y-startPoint.Y;
        theRectangle = new Rectangle(startPoint.X, 
            startPoint.Y, width, height);

        // Draw the new rectangle by calling DrawReversibleFrame
        // again.  
        ControlPaint.DrawReversibleFrame(theRectangle, 
            this.BackColor, FrameStyle.Dashed);
    }
}

private void Form1_MouseUp(object sender, 
    System.Windows.Forms.MouseEventArgs e)
{

    // If the MouseUp event occurs, the user is not dragging.
    isDrag = false;

    // Draw the rectangle to be evaluated. Set a dashed frame style 
    // using the FrameStyle enumeration.
    ControlPaint.DrawReversibleFrame(theRectangle, 
        this.BackColor, FrameStyle.Dashed);

    // Find out which controls intersect the rectangle and 
    // change their color. The method uses the RectangleToScreen  
    // method to convert the Control's client coordinates 
    // to screen coordinates.
    Rectangle controlRectangle;
    for(int i = 0; i < Controls.Count; i++)
    {
        controlRectangle = Controls[i].RectangleToScreen
            (Controls[i].ClientRectangle);
        if (controlRectangle.IntersectsWith(theRectangle))
        {
            Controls[i].BackColor = Color.BurlyWood;
        }
    }

    // Reset the rectangle.
    theRectangle = new Rectangle(0, 0, 0, 0);
}

private:
   // The following three methods will draw a rectangle and allow 
   // the user to use the mouse to resize the rectangle.  If the 
   // rectangle intersects a control's client rectangle, the 
   // control's color will change.
   bool isDrag;
   Rectangle theRectangle;
   Point startPoint;
   void Form1_MouseDown( Object^ sender, System::Windows::Forms::MouseEventArgs^ e )
   {
      
      // Set the isDrag variable to true and get the starting point 
      // by using the PointToScreen method to convert form 
      // coordinates to screen coordinates.
      if ( e->Button == ::MouseButtons::Left )
      {
         isDrag = true;
      }

      Control^ control = dynamic_cast<Control^>(sender);
      
      // Calculate the startPoint by using the PointToScreen 
      // method.
      startPoint = control->PointToScreen( Point(e->X,e->Y) );
   }

   void Form1_MouseMove( Object^ /*sender*/, System::Windows::Forms::MouseEventArgs^ e )
   {
      
      // If the mouse is being dragged, 
      // undraw and redraw the rectangle as the mouse moves.
      if ( isDrag )
      {
         ControlPaint::DrawReversibleFrame( theRectangle, this->BackColor, FrameStyle::Dashed );
         
         // Calculate the endpoint and dimensions for the new 
         // rectangle, again using the PointToScreen method.
         Point endPoint = this->PointToScreen( Point(e->X,e->Y) );
         int width = endPoint.X - startPoint.X;
         int height = endPoint.Y - startPoint.Y;
         theRectangle = Rectangle(startPoint.X,startPoint.Y,width,height);
         
         // Draw the new rectangle by calling DrawReversibleFrame
         // again.  
         ControlPaint::DrawReversibleFrame( theRectangle, this->BackColor, FrameStyle::Dashed );
      }
   }

   void Form1_MouseUp( Object^ /*sender*/, System::Windows::Forms::MouseEventArgs^ /*e*/ )
   {
      
      // If the MouseUp event occurs, the user is not dragging.
      isDrag = false;
      
      // Draw the rectangle to be evaluated. Set a dashed frame style 
      // using the FrameStyle enumeration.
      ControlPaint::DrawReversibleFrame( theRectangle, this->BackColor, FrameStyle::Dashed );
      
      // Find out which controls intersect the rectangle and 
      // change their color. The method uses the RectangleToScreen  
      // method to convert the Control's client coordinates 
      // to screen coordinates.
      Rectangle controlRectangle;
      for ( int i = 0; i < Controls->Count; i++ )
      {
         controlRectangle = Controls[ i ]->RectangleToScreen( Controls[ i ]->ClientRectangle );
         if ( controlRectangle.IntersectsWith( theRectangle ) )
         {
            Controls[ i ]->BackColor = Color::BurlyWood;
         }

      }
      
      // Reset the rectangle.
      theRectangle = Rectangle(0,0,0,0);
   }

// The following three methods will draw a rectangle and allow 
// the user to use the mouse to resize the rectangle. If the 
// rectangle intersects a control's client rectangle, the 
// control's color will change.
private boolean isDrag = false;
private Rectangle theRectangle =
    new Rectangle(new Point(0, 0), new Size(0, 0));
private Point startPoint;

private void Form1_MouseDown(Object sender,
    System.Windows.Forms.MouseEventArgs e)
{
    // Set the isDrag variable to true and get the starting point 
    // by using the PointToScreen method to convert form 
    // coordinates to screen coordinates.
    if (e.get_Button().Equals(MouseButtons.Left)) {
        isDrag = true;
    }

    Control control = (Control)sender;
    // Calculate the startPoint by using the PointToScreen 
    // method.
    startPoint = control.PointToScreen(new Point(e.get_X(), e.get_Y()));
} //Form1_MouseDown

private void Form1_MouseMove(Object sender,
    System.Windows.Forms.MouseEventArgs e)
{
    // If the mouse is being dragged, 
    // undraw and redraw the rectangle as the mouse moves.
    if (isDrag) {
        // Hide the previous rectangle by calling the 
        // DrawReversibleFrame method with the same parameters.
        ControlPaint.DrawReversibleFrame(theRectangle, this.get_BackColor(),
            FrameStyle.Dashed);
        // Calculate the endpoint and dimensions for the new 
        // rectangle, again using the PointToScreen method.
        Point endPoint = this.PointToScreen(new Point(e.get_X(), e.get_Y()));
        int width = endPoint.get_X() - startPoint.get_X();
        int height = endPoint.get_Y() - startPoint.get_Y();
        theRectangle = new Rectangle(startPoint.get_X(), startPoint.get_Y(),
            width, height);
        // Draw the new rectangle by calling DrawReversibleFrame
        // again.  
        ControlPaint.DrawReversibleFrame(theRectangle, this.get_BackColor(),
            FrameStyle.Dashed);
    }
} //Form1_MouseMove

private void Form1_MouseUp(Object sender,
    System.Windows.Forms.MouseEventArgs e)
{
    // If the MouseUp event occurs, the user is not dragging.
    isDrag = false;
    // Draw the rectangle to be evaluated. Set a dashed frame style 
    // using the FrameStyle enumeration.
    ControlPaint.DrawReversibleFrame(theRectangle, this.get_BackColor(),
        FrameStyle.Dashed);
    // Find out which controls intersect the rectangle and 
    // change their color. The method uses the RectangleToScreen  
    // method to convert the Control's client coordinates 
    // to screen coordinates.
    Rectangle controlRectangle;
    for (int i = 0; i < get_Controls().get_Count(); i++) {
        controlRectangle =
            get_Controls().get_Item(i).RectangleToScreen(get_Controls().
            get_Item(i).get_ClientRectangle());
        if (controlRectangle.IntersectsWith(theRectangle)) {
            get_Controls().get_Item(i).set_BackColor(Color.get_BurlyWood());
        }
    }
    // Reset the rectangle.
    theRectangle = new Rectangle(0, 0, 0, 0);
} //Form1_MouseUp

平台

Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。

版本信息

.NET Framework

受以下版本支持：2.0、1.1、1.0

.NET Compact Framework

受以下版本支持：2.0、1.0

请参见

参考

Control 类
Control 成员
System.Windows.Forms 命名空间
Rectangle
RectangleToClient