UIElement.CaptureMouse メソッド

定義

この要素にマウスをキャプチャするように強制することを試みます。Attempts to force capture of the mouse to this element.

public:
 virtual bool CaptureMouse();
public bool CaptureMouse ();
abstract member CaptureMouse : unit -> bool
override this.CaptureMouse : unit -> bool
Public Function CaptureMouse () As Boolean

戻り値

マウスが正常にキャプチャされた場合は true。それ以外の場合は falsetrue if the mouse is successfully captured; otherwise, false.

実装

次の例では、マウスをキャプチャ (および uncapture) し、3D モデルを表示するための特殊なマウスモードを有効にする、マウスとキー入力の組み合わせに対するハンドラーのペアを実装します。The following example implements a pair of handlers for mouse and key input combination that capture (and uncapture) the mouse and enable a special mouse mode for viewing a 3D model.

private void MouseDownHandler(object sender, MouseButtonEventArgs e)
{
    if (!Enabled) return;
    e.Handled = true;


    if (Keyboard.IsKeyDown(Key.F1) == true)
    {
        Reset();
        return;
    }

    UIElement el = (UIElement)sender;
    _point = e.MouseDevice.GetPosition(el);
    // Initialize the center of rotation to the lookatpoint
    if (!_centered)
    {
        ProjectionCamera camera = (ProjectionCamera)_slaves[0].Camera;
        _center = camera.LookDirection;
        _centered = true;
    }

    _scaling = (e.MiddleButton == MouseButtonState.Pressed);

    if (Keyboard.IsKeyDown(Key.Space) == false)
        _rotating = true;
    else
        _rotating = false;

    el.CaptureMouse();
}

private void MouseUpHandler(object sender, MouseButtonEventArgs e)
{
    if (!_enabled) return;
    e.Handled = true;

    // Stuff the current initial + delta into initial so when we next move we
    // start at the right place.
    if (_rotating == true)
        _rotation = _rotationDelta * _rotation;
    else
    {
        _translate += _translateDelta;
        _translateDelta.X = 0;
        _translateDelta.Y = 0;
    }

    //_scale = _scaleDelta*_scale;
    UIElement el = (UIElement)sender;
    el.ReleaseMouseCapture();
}
Private Sub MouseDownHandler(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
    If Not Enabled Then
        Return
    End If
    e.Handled = True


    If Keyboard.IsKeyDown(Key.F1) = True Then
        Reset()
        Return
    End If

    Dim el As UIElement = CType(sender, UIElement)
    _point = e.MouseDevice.GetPosition(el)
    ' Initialize the center of rotation to the lookatpoint
    If Not _centered Then
        Dim camera As ProjectionCamera = CType(_slaves(0).Camera, ProjectionCamera)
        _center = camera.LookDirection
        _centered = True
    End If

    _scaling = (e.MiddleButton = MouseButtonState.Pressed)

    If Keyboard.IsKeyDown(Key.Space) = False Then
        _rotating = True
    Else
        _rotating = False
    End If

    el.CaptureMouse()
End Sub

Private Sub MouseUpHandler(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
    If Not _enabled Then
        Return
    End If
    e.Handled = True

    ' Stuff the current initial + delta into initial so when we next move we
    ' start at the right place.
    If _rotating = True Then
        _rotation = _rotationDelta * _rotation
    Else
        _translate += _translateDelta
        _translateDelta.X = 0
        _translateDelta.Y = 0
    End If

    '_scale = _scaleDelta * _scale
    Dim el As UIElement = CType(sender, UIElement)
    el.ReleaseMouseCapture()
End Sub

注釈

キャプチャするには、要素を有効にする必要があります。To be captured, an element must be enabled. CaptureMouseを呼び出す前に IsEnabledtrue かどうかを確認します。Check whether IsEnabled is true before you call CaptureMouse.

CaptureMouse を呼び出すと trueが返される場合、IsMouseCapturedtrueます。If calling CaptureMouse returns true, then IsMouseCaptured is also true.

CaptureMouse を呼び出すと trueが返された場合、GotMouseCapture および IsMouseCapturedChanged イベントが発生し、RoutedEventArgs.Source メソッドが呼び出された要素として報告されたイベントデータが CaptureMouse されます。If calling CaptureMouse returns true, then the GotMouseCapture and IsMouseCapturedChanged events are raised, with RoutedEventArgs.Source in the event data reported as the element where the CaptureMouse method is called. キャプチャを強制的に実行すると、既存のキャプチャに干渉する可能性があります。特に、ドラッグアンドドロップに関連するキャプチャがマウスで発生する場合です。If you force capture, you might interfere with existing captures - especially with captures that relate to drag-and-drop with the mouse.

すべての要素からマウスキャプチャをクリアするには、nullとして指定された element パラメーターを使用して Mouse.Capture を呼び出します。To clear mouse capture from all elements, call Mouse.Capture with the element parameter provided as null.

適用対象

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