ControlPaint.FillReversibleRectangle(Rectangle, Color) Metod

public:
 static void FillReversibleRectangle(System::Drawing::Rectangle rectangle, System::Drawing::Color backColor);

public static void FillReversibleRectangle(System.Drawing.Rectangle rectangle, System.Drawing.Color backColor);

static member FillReversibleRectangle : System.Drawing.Rectangle * System.Drawing.Color -> unit

Public Shared Sub FillReversibleRectangle (rectangle As Rectangle, backColor As Color)

Parametrar

Exempel

Följande kodexempel visar hur du använder FillReversibleRectangle metoden. Om du vill köra exemplet klistrar du in följande kod i ett formulär. Lägg till en knapp med namnet Button2 i formuläret och se till att alla händelser är anslutna till deras händelsehanterare.

//When the mouse hovers over Button2, its ClientRectangle is filled.
void Button2_MouseHover( Object^ sender, System::EventArgs^ /*e*/ )
{
   Control^ senderControl = dynamic_cast<Control^>(sender);
   Rectangle screenRectangle = senderControl->RectangleToScreen( senderControl->ClientRectangle );
   ControlPaint::FillReversibleRectangle( screenRectangle, senderControl->BackColor );
}

// When the mouse leaves Button2, its ClientRectangle is cleared by
// calling the FillReversibleRectangle method again.
void Button2_MouseLeave( Object^ sender, System::EventArgs^ /*e*/ )
{
   Control^ senderControl = dynamic_cast<Control^>(sender);
   Rectangle screenRectangle = senderControl->RectangleToScreen( senderControl->ClientRectangle );
   ControlPaint::FillReversibleRectangle( screenRectangle, senderControl->BackColor );
}

//When the mouse hovers over Button2, its ClientRectangle is filled.
private void Button2_MouseHover(object sender, System.EventArgs e)
{
    Control senderControl = (Control) sender;
    Rectangle screenRectangle = senderControl.RectangleToScreen(
        senderControl.ClientRectangle);
    ControlPaint.FillReversibleRectangle(screenRectangle, 
        senderControl.BackColor);
}

// When the mouse leaves Button2, its ClientRectangle is cleared by
// calling the FillReversibleRectangle method again.
private void Button2_MouseLeave(object sender, System.EventArgs e)
{
    Control senderControl = (Control) sender;
    Rectangle screenRectangle = senderControl.RectangleToScreen(
        senderControl.ClientRectangle);
    ControlPaint.FillReversibleRectangle(screenRectangle, 
        senderControl.BackColor);
}

' When the mouse hovers over Button2, its ClientRectangle is filled.
Private Sub Button2_MouseHover(ByVal sender As Object, _
    ByVal e As System.EventArgs) Handles Button2.MouseHover

    Dim senderControl As Control = CType(sender, Control)
    Dim screenRectangle As Rectangle = _
        senderControl.RectangleToScreen(senderControl.ClientRectangle)
    ControlPaint.FillReversibleRectangle(screenRectangle, _
        senderControl.BackColor)
End Sub


' When the mouse leaves Button2, its ClientRectangle is cleared by
' calling the FillReversibleRectangle method again.
Private Sub Button2_MouseLeave(ByVal sender As Object, _
    ByVal e As System.EventArgs) Handles Button2.MouseLeave

    Dim senderControl As Control = CType(sender, Control)
    Dim screenRectangle As Rectangle = _
        senderControl.RectangleToScreen(senderControl.ClientRectangle)
    ControlPaint.FillReversibleRectangle(screenRectangle, _
        senderControl.BackColor)
End Sub

Kommentarer

Parametern backColor används för att beräkna rektangelns fyllningsfärg så att den alltid visas mot bakgrunden.

Resultatet av den här metoden kan vändas genom att rita samma rektangel igen. Att rita en rektangel med den här metoden liknar att invertera en region på skärmen, förutom att den ger bättre prestanda för en bredare mängd olika färger.

Se även

• BackColor