我将图像控件放在滚动查看器中,就像tnis一样：
<ScrollViewer VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" >
<Image Source="/Test/1.jpg" Width="320">
<Image.RenderTransform>
<CompositeTransform ScaleX="{Binding Path=Value,ElementName=slider}"/>
</Image.RenderTransform>
</Image>
</ScrollViewer>
正如代码所示,我添加了一个滑块来控制图像的Compositetransform,但是当我改变滑块的值时,什么也没发生？
而且我还尝试在图像上附加缩放和平移行为(取决于工具包),不幸的是,我可以上下滚动,但我无法放大/缩小图像.似乎Scrollviewer阻止了捏合操纵.
我们知道,Scrollviewer控件在WPF中有一个“ZoomMode”属性,但在Windows Phone中已弃用.
那么我怎样才能实现iamge缩放滚动查看器,有人能给我一个帮助吗？
xaml代码：
原文链接：https://www.f2er.com/windows/363432.html<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,12,0">
<ScrollViewer x:Name="scrl" Height="300" Width="300" BorderBrush="red"
BorderThickness="2" VerticalScrollBarVisibility="Disabled">
<StackPanel>
<Image x:Name="img" Source="Assets/Mountain.jpg" Height="100" Width="150"
RenderTransformOrigin="0.5,0.5">
<Image.RenderTransform>
<CompositeTransform x:Name="trans"/>
</Image.RenderTransform>
<toolkit:GestureService.GestureListener>
<toolkit:GestureListener PinchStarted="GestureListener_PinchStarted" PinchDelta="GestureListener_PinchDelta" DragDelta="GestureListener_DragDelta"/>
</toolkit:GestureService.GestureListener>
</Image>
</StackPanel>
</ScrollViewer>
</Grid>
cs代码：
double _initialAngle,_initialScale;
public MainPage()
{
InitializeComponent();
scrl.ManipulationMode = ManipulationMode.Control;
}
private void GestureListener_PinchStarted(object sender,PinchStartedGestureEventArgs e)
{
_initialAngle = trans.Rotation;
_initialScale = trans.ScaleX;
}
private void GestureListener_PinchDelta(object sender,PinchGestureEventArgs e)
{
trans.Rotation = _initialAngle + e.TotalAngleDelta;
var curZoom = _initialScale * e.DistanceRatio;
if (curZoom >= 1 && curZoom <= 3)
{
trans.ScaleX = _initialScale * e.DistanceRatio;
trans.ScaleY = _initialScale * e.DistanceRatio;
}
}
private void GestureListener_DragDelta(object sender,DragDeltaGestureEventArgs e)
{
trans.TranslateX += e.HorizontalChange;
trans.TranslateY += e.VerticalChange;
}
此代码适用于缩放,旋转和缩放.
