本人在使用FlipView制作图片浏览，多点缩放时候遇到这一问题，当我图片浏览中没有添加ManipulationDelta可以正常进行滑动到下一张图片，但现在添加ManipulationDelta后，无法滑动到下一张图片。本人给FlipView注册了SelectionChanged事件，方便观察切换效果，跟踪代码发现，这个SelectionChanged事件事件再也没有触发过。这是什么原因啊？找了半天没发现哪里问题，求大神们指点下！
以下是xmal代码
<Grid Grid.Row="0" x:Name="imageGrid" Grid.RowSpan="3">
<Grid.RenderTransform>
<Composi
teTransform x:Name="FlipImageTranform"/>
</Grid.RenderTransform>
<FlipView x:Name="flipImage" Tapped="flipImage_Tapped" SelectionChanged="flipImage_SelectionChanged" ItemsSource="{Binding PictureFileList}" SelectedIndex="{Binding
CurrentIndex,Mode=TwoWay}">
<FlipView.ItemTemplate>
<DataTemplate>
<Image x:Name="FileViewImage" Stretch="Fill" ManipulationMode="All" ManipulationDelta="FileViewImage_ManipulationDelta"
ManipulationCompleted="FileViewImage_ManipulationCompleted" Source="{Binding SamTumbImage}">
</Image>
</DataTemplate>
</FlipView.ItemTemplate>
</FlipView>
</Grid>
下面是后台代码
private void FileViewImage_ManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e)
{
FlipImageTranform.ScaleX *= e.Delta.Scale;
FlipImageTranform.ScaleY *= e.Delta.Scale;
FlipImageTranform.CenterX = e.Position.X;
FlipImageTranform.CenterY = e.Position.Y;
if (FlipImageTranform.ScaleX <= 1.0)
{
FlipImageTranform.ScaleX = 1.0;
FlipImageTranform.ScaleY = 1.0;
//设置当前缩放比例为1，并可以进行切换到下一张图片
IsCanManipulate = true; //为全局变量，提供判断是否可以进行滑动到下一张图片
}
else
{
var newTranslateX = FlipImageTranform.TranslateX + e.Delta.Translation.X;
var newTranslateY = FlipImageTranform.TranslateY + e.Delta.Translation.Y;
if (newTranslateX < (-1 * (imageGrid.ActualWidth / 2)) || newTranslateX > (imageGrid.ActualWidth / 2))
return;
else
FlipImageTranform.TranslateX = newTranslateX;
if (newTranslateY < (-1 * (imageGrid.ActualHeight / 2)) || newTranslateY > (imageGrid.ActualHeight / 2))
return;
else
FlipImageTranform.TranslateY = newTranslateY;
}
}
#region 设置下一个图片
private void SetCurrentPictureIndex()
{
int index = GetIndex(pictureNameTbk.Text);
if (index != _lAllPicture.Count - 1)
{
index++;
flipImage.SelectedIndex = index; //设置当前index是成功，比如原来是9，现在设置是10，但changed事件没触发
flipImage.SelectedItem = _lAllPicture[index]; //lAllPicture为FlipView数据源
}
}
#endregion
#region 触控完成
private void FileViewImage_ManipulationCompleted(object sender, ManipulationCompletedRoutedEventArgs e)
{
if (!IsCanManipulate) return;
SetCurrentPictureIndex();
}
#endregion
private void flipImage_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
//这个事件再也没有触发过
FileInfo finfo = this.flipImage.SelectedValue as FileInfo;
if (finfo !=null)
pictureNameTbk.Text = finfo.FileName;
}
FlipView绑定的SelectedIndex="{Binding CurrentIndex,Mode=TwoWay}">对应的CurrentIndex也做了通知
private int currentIndex;
public int CurrentIndex
{
get
{
return currentIndex;
}
set
{
if (value != currentIndex)
{
currentIndex = value;
NotifyChanged("CurrentIndex");
求高手帮忙！小弟实在是找不出问题出在哪了，纠结啊！
