Control.MouseButtons-Eigenschaft
Ruft einen Wert ab, der angibt, welche Maustaste gerade gedrückt wird.
Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)
Syntax
'Declaration
Public Shared ReadOnly Property MouseButtons As MouseButtons
'Usage
Dim value As MouseButtons
value = Control.MouseButtons
public static MouseButtons MouseButtons { get; }
public:
static property MouseButtons MouseButtons {
MouseButtons get ();
}
/** @property */
public static MouseButtons get_MouseButtons ()
public static function get MouseButtons () : MouseButtons
Eigenschaftenwert
Eine bitweise Kombination der MouseButtons-Enumerationswerte. Der Standardwert ist None.
Beispiel
Im folgenden Codebeispiel wird veranschaulicht, wie die Member BackColor, RectangleToScreen, PointToScreen, MouseButtons, ControlPaint.DrawReversibleFrame und Rectangle.IntersectsWith verwendet werden. Fügen Sie zum Ausführen des Beispiels folgenden Code in ein Formular mit der Bezeichnung Form1 ein, das mehrere Steuerelemente enthält. In diesem Beispiel müssen die Ereignisse MouseDown, MouseMove und MouseUp mit den in diesem Beispiel definierten Ereignishandlern verbunden sein.
' 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
Plattformen
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
.NET Compact Framework
Unterstützt in: 2.0, 1.0
Siehe auch
Referenz
Control-Klasse
Control-Member
System.Windows.Forms-Namespace
MouseButtons
MouseEventArgs