与WPF中的MouseWheel事件相关的调用缩放功能图

Question

我有WPF应用和Bing地图，我一时陷入困境。按住鼠标左键可创建一个图钉。而且，如果您想在光标位于插入的图钉上时使用鼠标滚轮更改地图滚动，则不会发生任何事情。我了解，我在地图上的物品没有通话事件。但是如果使用MouseUp事件，我将重新定义我的方法（函数：myMap_MouseMove，str：pin.MouseUp + = Pin_MouseUp;）]

代码（XAML）：

    <m:Map x:Name="myMap" ZoomLevel="15" Mode="AerialWithLabels" MouseMove="myMap_MouseMove" MouseUp="myMap_MouseUp"  />

代码（C＃）：

    private void myMap_MouseUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
    {
        if (isDragging)
        {
            isDragging = false;
            return;
        }

        switch (e.ChangedButton)
        {
            case System.Windows.Input.MouseButton.Left:
                myMap_MouseLeftButtonDown(sender, e);
                break;

            case System.Windows.Input.MouseButton.Right:
                myMap_MouseRightButtonDown(sender, e);
                break;

            default:
                break;

        }

    }
private void myMap_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
{
    ...
    foreach (var viewportPoint in drawPolyPoints)
    {
        // Convert the mouse coordinates to a location on the map
        ControlTemplate template = (ControlTemplate)this.FindResource("CutomPushpinTemplate");
        Pushpin pin = new Pushpin();
        pin.Location = viewportPoint;
        //pin.Template = template;
        pin.Style = (Style)this.FindResource("LabelPushpinStyle");
        pin.MouseUp += Pin_MouseUp;  // It's OK
        pin.MouseWheel += myMap.MouseWheel;  // problem
        myMap.Children.Add(pin);
    }

    double area = CalculateArea(_polyLocations);
    this.Fields.Text = "Area: " + area;
}
    private void myMap_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
    {

        ...
        e.Handled = true;
        Point mousePosition = e.GetPosition(myMap);

        Location pinLocation = myMap.ViewportPointToLocation(mousePosition);
        ControlTemplate template = (ControlTemplate)this.FindResource("CutomPushpinTemplate");

        // The pushpin to add to the map.
        Pushpin pin = new Pushpin();
        pin.Location = pinLocation;
        pin.Style = (Style)this.FindResource("LabelPushpinStyle");

        // Adds the pushpin to the map
        myMap.Children.Add(pin);
        drawPolyPoints.Add(pin.Location);

        ...

    }

我在MouseWheel事件中遇到一些问题。

如何调用子项（PushPin或其他）中的Map MouseWheel事件？

Answer 1

要在地图上引发MouseWheelEvent，可以声明一个新的eventHandler，它将把事件转发到地图上。MouseWheelEvent处理程序：

private void RaiseMyMapMouseWheel(object sender, MouseWheelEventArgs e)
    {
        var eventArg = new MouseWheelEventArgs(e.MouseDevice, e.Timestamp, e.Delta)
        {
            RoutedEvent = UIElement.MouseWheelEvent,
            //You can change the sender for myMap if you wish
            Source = sender
        };
        myMap.RaiseEvent(eventArg);
    }

然后您像这样添加处理程序：

pin.MouseWheel += this.RaiseMyMapMouseWheel;