在 WP8 中使用双指缩放图片幻灯片 [英] Pictures slideshow with pinch zoom in WP8

问题描述

我正在尝试使用经典图片视图制作应用程序，例如在照片中心或任何移动设备上的任何标准图片应用程序中.到目前为止，我开始使用 Kinnara 工具包 fork 中的 FlipView 和 CompositeTransform 进行缩放，但我不明白如何将图片与屏幕中心对齐(VerticalAlignment=Center 似乎不能作为 DataTemplate 中 Image 的属性)，我不明白如何在查看邻居图片时使缩放图片在背景中不可见.另外，也许我错过了一些标准模式?

I am trying to make application with classic pictures view like in photo hub or any standard picture application on any mobile device. So far I began to use FlipView from Kinnara's toolkit fork and CompositeTransform for pinchzooming, but I don't understand how to align picture to the center of the screen (VerticalAlignment=Center seems to not working as a property of Image inside DataTemplate) and I don't understand how to make zoomed pictures not visible in background when viewing neighbor picture. Also, maybe there are some standard patterns for it that I missed?

UPD:一些代码

<toolkit:FlipView x:Name="FlipView"
                  d:DataContext="{d:DesignInstance viewModels:PostsViewModel}"
                  ItemsSource="{Binding Pictures}">
    <toolkit:FlipView.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Vertical">
                <ProgressBar Value="{Binding DownloadProgress}"
                             Maximum="100"
                             Minimum="1"
                             IsEnabled="{Binding IsLoading}" />
                <Image x:Name="PostImage"
                       Source="{Binding Sample}"
                       HorizontalAlignment="Center"
                       VerticalAlignment="Center"
                       Stretch="UniformToFill"
                       ManipulationDelta="Image_OnManipulationDelta">
                    <Image.RenderTransform>
                        <CompositeTransform />
                    </Image.RenderTransform>
                </Image>

            </StackPanel>
        </DataTemplate>
    </toolkit:FlipView.ItemTemplate>
</toolkit:FlipView>

UPD2:缩放代码

    private void Image_OnManipulationDelta(object sender, ManipulationDeltaEventArgs e)
    {
        if (e.PinchManipulation != null)
        {
            var transform = (CompositeTransform)((Image) sender).RenderTransform;

            // Scale Manipulation
            transform.ScaleX = e.PinchManipulation.CumulativeScale;
            transform.ScaleY = e.PinchManipulation.CumulativeScale;

            // Translate manipulation
            var originalCenter = e.PinchManipulation.Original.Center;
            var newCenter = e.PinchManipulation.Current.Center;
            transform.TranslateX = newCenter.X - originalCenter.X;
            transform.TranslateY = newCenter.Y - originalCenter.Y;
            // end 
            e.Handled = true;
        }
    }

推荐答案

如果您想要更像 OS 的外观(比如图片库中的图像显示方式)，请查看名为 Windows Phone Media Viewer 的 nuget( https://www.nuget.org/packages/PhoneMediaViewer/).

If you want the more OS like look and feel ( like how images are shown in the pictures lib ), take a look at the nuget called Windows Phone Media Viewer ( https://www.nuget.org/packages/PhoneMediaViewer/ ).

甚至有一个示例应用程序已经在 MSDN 上用完了 ( http://code.msdn.microsoft.com/wpapps/Basic-Lens-sample-359fda1b )

There is even a sample app where it's been used up on MSDN ( http://code.msdn.microsoft.com/wpapps/Basic-Lens-sample-359fda1b )

这篇关于在 WP8 中使用双指缩放图片幻灯片的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！