调用缩放功能图，与WPF中的MouseWheel事件相关

Question

我有 WPF 应用程序和 Bing 地图，我卡在了片刻。单击鼠标左键创建图钉。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，则什么也不会发生。我知道，我在地图上的项目没有调用事件。但是如果使用 MouseUp 事件，我重新定义了我的方法（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);

        ...

    }

我在使用 MouseWheel 事件时遇到一些问题。

如何从子项（图钉或其他）调用 Map MouseWheel 事件？？

Answer 1

要在地图上引发 MouseWheelEvent，您可以声明一个新的事件处理程序，它将事件转发给 map.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);
    }

然后像这样添加处理程序：

pin.MouseWheel += this.RaiseMyMapMouseWheel;

调用缩放功能图，与WPF中的MouseWheel事件相关

Call zoom function map, related with MouseWheel event in WPF

c#

wpf

bing