• 【WP8.1】系统控件的bug及修复方案

    最近开发的时候，发现Windows Phone 8.1 Runtime中的两个控件的存在bug的情况，现总结出来，并给出解决方案。

    1、Hub控件

    Hub控件的顶部默认是可以拖动来切换HubSection的：

    然而当我们将Hub的Header设置为复杂对象的时候，例如：

     1         <Hub>
 2             <Hub.Header>
 3                 <StackPanel Orientation="Horizontal">
 4                     <Image Source="Assets/logo11w.png"
 5                            Height="100" />
 6                     <TextBlock Text="谷歌" />
 7                 </StackPanel>
 8             </Hub.Header>
 9             <HubSection Header="section 1"
10                         Background="Red" />
11             <HubSection Header="section 2"
12                         Background="Green" />
13             <HubSection Header="section 3"
14                         Background="Blue" />
15         </Hub>
    设置方式1

    或者使用HeaderTemplate的方式设置：

     1         <Hub>
 2             <Hub.HeaderTemplate>
 3                 <DataTemplate>
 4                     <StackPanel Orientation="Horizontal">
 5                         <Image Source="Assets/logo11w.png"
 6                                Height="100" />
 7                         <TextBlock Text="谷歌" />
 8                     </StackPanel>
 9                 </DataTemplate>
10             </Hub.HeaderTemplate>
11             <HubSection Header="section 1"
12                         Background="Red" />
13             <HubSection Header="section 2"
14                         Background="Green" />
15             <HubSection Header="section 3"
16                         Background="Blue" />
17         </Hub>
    设置方式2

    Hub的顶部就再也无法拖动了。

    解决方案：重写Hub控件的模板。

    以上面设置Header的内容为例，重写Hub的Template如下：

      1         <x:Int32 x:Key="HubHeaderCharacterSpacing">-22</x:Int32>
  2         <x:Double x:Key="HubHeaderFontSize">78</x:Double>
  3         <FontFamily x:Key="PhoneFontFamilyNormal">Segoe WP</FontFamily>
  4         <Thickness x:Key="HubHeaderMarginThickness">15,1,0,0</Thickness>
  5         <Style x:Key="HubFixStyle"
  6                TargetType="Hub">
  7             <Setter Property="Template">
  8                 <Setter.Value>
  9                     <ControlTemplate TargetType="Hub">
 10                         <Grid x:Name="HubRoot">
 11                             <Grid.Projection>
 12                                 <PlaneProjection x:Name="EntranceAnimationProjection" />
 13                             </Grid.Projection>
 14                             <Grid.RowDefinitions>
 15                                 <RowDefinition Height="auto" />
 16                                 <RowDefinition Height="*" />
 17                             </Grid.RowDefinitions>
 18                             <VisualStateManager.VisualStateGroups>
 19                                 <VisualStateGroup x:Name="BackgroundImageLoadStates">
 20                                     <VisualState x:Name="BackgroundHidden">
 21                                         <Storyboard>
 22                                             <FadeOutThemeAnimation Storyboard.TargetName="Background" />
 23                                         </Storyboard>
 24                                     </VisualState>
 25                                     <VisualState x:Name="BackgroundImageFadingIn">
 26                                         <Storyboard>
 27                                             <FadeInThemeAnimation Storyboard.TargetName="Background" />
 28                                         </Storyboard>
 29                                     </VisualState>
 30                                     <VisualState x:Name="BackgroundShowing">
 31                                         <Storyboard>
 32                                             <DoubleAnimation To="1"
 33                                                              Storyboard.TargetProperty="Opacity"
 34                                                              Storyboard.TargetName="Background" />
 35                                         </Storyboard>
 36                                     </VisualState>
 37                                 </VisualStateGroup>
 38                             </VisualStateManager.VisualStateGroups>
 39                             <Canvas Grid.RowSpan="2">
 40                                 <Canvas.Clip>
 41                                     <RectangleGeometry x:Name="BackgroundClipRect" />
 42                                 </Canvas.Clip>
 43                                 <Grid x:Name="Background">
 44                                     <Grid.RenderTransform>
 45                                         <CompositeTransform x:Name="BackgroundParallaxTransform" />
 46                                     </Grid.RenderTransform>
 47                                     <Border x:Name="WrapBackground"
 48                                             BorderBrush="{TemplateBinding BorderBrush}"
 49                                             BorderThickness="{TemplateBinding BorderThickness}"
 50                                             Background="{TemplateBinding Background}">
 51                                         <Border.RenderTransform>
 52                                             <CompositeTransform x:Name="WrapBackgroundParallaxTransform" />
 53                                         </Border.RenderTransform>
 54                                     </Border>
 55                                     <Border x:Name="MainBackground"
 56                                             BorderBrush="{TemplateBinding BorderBrush}"
 57                                             BorderThickness="{TemplateBinding BorderThickness}"
 58                                             Background="{TemplateBinding Background}" />
 59                                 </Grid>
 60                             </Canvas>
 61                             <ScrollViewer x:Name="ScrollViewer"
 62                                           HorizontalScrollMode="Auto"
 63                                           HorizontalSnapPointsType="None"
 64                                           HorizontalAlignment="Left"
 65                                           HorizontalScrollBarVisibility="Hidden"
 66                                           Grid.RowSpan="2"
 67                                           Template="{StaticResource ScrollViewerScrollBarlessTemplate}"
 68                                           VerticalScrollBarVisibility="Disabled"
 69                                           VerticalScrollMode="Disabled"
 70                                           ZoomMode="Disabled">
 71                                 <ItemsStackPanel x:Name="Panel"
 72                                                  CacheLength="6"
 73                                                  Orientation="{TemplateBinding Orientation}" />
 74                             </ScrollViewer>
 75                             <Canvas Grid.Row="0">
 76                                 <Canvas.Clip>
 77                                     <RectangleGeometry x:Name="HeaderClipRect" />
 78                                 </Canvas.Clip>
 79                                 <ContentControl x:Name="HeaderHost"
 80                                                 CharacterSpacing="{StaticResource HubHeaderCharacterSpacing}"
 81                                                 ContentTemplate="{TemplateBinding HeaderTemplate}"
 82                                                 FontWeight="Light"
 83                                                 FontSize="{StaticResource HubHeaderFontSize}"
 84                                                 FontFamily="{StaticResource PhoneFontFamilyNormal}"
 85                                                 Margin="{StaticResource HubHeaderMarginThickness}">
 86                                     <ContentControl.RenderTransform>
 87                                         <TransformGroup>
 88                                             <CompositeTransform x:Name="HeaderParallaxTransform" />
 89                                             <TranslateTransform x:Name="HeaderFlyinFlyoutTransform" />
 90                                         </TransformGroup>
 91                                     </ContentControl.RenderTransform>
 92                                     <ContentControl.Content>
 93                                         <StackPanel Orientation="Horizontal">
 94                                             <Image Source="Assets/logo11w.png"
 95                                                    Height="100" />
 96                                             <ContentPresenter Content="{TemplateBinding Header}" />
 97                                         </StackPanel>
 98                                     </ContentControl.Content>
 99                                 </ContentControl>
100                             </Canvas>
101                         </Grid>
102                     </ControlTemplate>
103                 </Setter.Value>
104             </Setter>
105         </Style>
    Hub的Header解决方案

    效果：

    2、Image控件

    如果同一时间有多个Image控件进行加载网络图像的话，那么有部分将会加载失败。

    这里先列出测试的数据源：

                "http://www.bing.com/az/hprichbg/rb/DragonFlyBeijing_ZH-CN8555054089_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/MidAutumnFestivalHongKong_ZH-CN9020398465_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/MusulmokBeach_ZH-CN12849119858_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/BetulaVerrucosa_ZH-CN9596215235_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/HoluhraunVolcano_ZH-CN10866460287_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/SouthernElephantSeal_ZH-CN11868940461_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/YokoteKamakura_ZH-CN11459129782_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/SpottedLakeCanada_ZH-CN12374082037_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/StKildaBay_ZH-CN12275183653_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/SellinPier_ZH-CN9832633239_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/RNPFogVideo_ZH-CN8941485556_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/PaperFansRedLanterns_ZH-CN9355904288_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/NinthEmperorGodTemple_ZH-CN13109315006_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/ChineseDecorationTiger_ZH-CN13118003712_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/NewYearPinwheels_ZH-CN12259065748_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/NewYearOrnaments_ZH-CN10726465661_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/DadaochengFireworks_ZH-CN10749562397_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/SummerVacation_ZH-CN10164213926_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/InsideRhoneGlacier_ZH-CN10709433723_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/BodleianLibrary_ZH-CN13371852606_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/HeartNebula_ZH-CN7750020667_150x150.jpg",
            "http://www.bing.com/az/hprichbg/rb/HotAndCold_ZH-CN8140560654_150x150.jpg"
    测试数据源

    来自每天的必应壁纸，将大小选定为150x150排除由于过大而导致失败的因素，并且在150x150下，每幅图像均只有几kb。

    测试前台XAML：

     1 <Page x:Class="BugDemo.ImageBugPage"
 2       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 3       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 4       xmlns:local="using:BugDemo"
 5       xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
 6       xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
 7       mc:Ignorable="d"
 8       Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
 9     <Grid>
10         <Grid.RowDefinitions>
11             <RowDefinition Height="Auto" />
12             <RowDefinition />
13         </Grid.RowDefinitions>
14         <Button Content="Load"
15                 Click="BtnLoad_Click" />
16         <ListView Grid.Row="1"
17                   x:Name="lvwImage"
18                   Background="Gray">
19             <ListView.ItemTemplate>
20                 <DataTemplate>
21                     <Image Width="150"
22                            Height="150"
23                            Source="{Binding}"
24                            ImageFailed="Image_ImageFailed" />
25                 </DataTemplate>
26             </ListView.ItemTemplate>
27         </ListView>
28     </Grid>
29 </Page>
    ImageBug前台

    后台cs：

     1 using System.Diagnostics;
 2 using Windows.Phone.UI.Input;
 3 using Windows.UI.Xaml;
 4 using Windows.UI.Xaml.Controls;
 5 using Windows.UI.Xaml.Navigation;
 6 
 7 // “空白页”项模板在 http://go.microsoft.com/fwlink/?LinkID=390556 上有介绍
 8 
 9 namespace BugDemo
10 {
11     /// <summary>
12     /// 可用于自身或导航至 Frame 内部的空白页。
13     /// </summary>
14     public sealed partial class ImageBugPage : Page
15     {
16         private string[] _testUrl = new string[]{
17             "http://www.bing.com/az/hprichbg/rb/DragonFlyBeijing_ZH-CN8555054089_150x150.jpg",
18             "http://www.bing.com/az/hprichbg/rb/MidAutumnFestivalHongKong_ZH-CN9020398465_150x150.jpg",
19             "http://www.bing.com/az/hprichbg/rb/MusulmokBeach_ZH-CN12849119858_150x150.jpg",
20             "http://www.bing.com/az/hprichbg/rb/BetulaVerrucosa_ZH-CN9596215235_150x150.jpg",
21             "http://www.bing.com/az/hprichbg/rb/HoluhraunVolcano_ZH-CN10866460287_150x150.jpg",
22             "http://www.bing.com/az/hprichbg/rb/SouthernElephantSeal_ZH-CN11868940461_150x150.jpg",
23             "http://www.bing.com/az/hprichbg/rb/YokoteKamakura_ZH-CN11459129782_150x150.jpg",
24             "http://www.bing.com/az/hprichbg/rb/SpottedLakeCanada_ZH-CN12374082037_150x150.jpg",
25             "http://www.bing.com/az/hprichbg/rb/StKildaBay_ZH-CN12275183653_150x150.jpg",
26             "http://www.bing.com/az/hprichbg/rb/SellinPier_ZH-CN9832633239_150x150.jpg",
27             "http://www.bing.com/az/hprichbg/rb/RNPFogVideo_ZH-CN8941485556_150x150.jpg",
28             "http://www.bing.com/az/hprichbg/rb/PaperFansRedLanterns_ZH-CN9355904288_150x150.jpg",
29             "http://www.bing.com/az/hprichbg/rb/NinthEmperorGodTemple_ZH-CN13109315006_150x150.jpg",
30             "http://www.bing.com/az/hprichbg/rb/ChineseDecorationTiger_ZH-CN13118003712_150x150.jpg",
31             "http://www.bing.com/az/hprichbg/rb/NewYearPinwheels_ZH-CN12259065748_150x150.jpg",
32             "http://www.bing.com/az/hprichbg/rb/NewYearOrnaments_ZH-CN10726465661_150x150.jpg",
33             "http://www.bing.com/az/hprichbg/rb/DadaochengFireworks_ZH-CN10749562397_150x150.jpg",
34             "http://www.bing.com/az/hprichbg/rb/SummerVacation_ZH-CN10164213926_150x150.jpg",
35             "http://www.bing.com/az/hprichbg/rb/InsideRhoneGlacier_ZH-CN10709433723_150x150.jpg",
36             "http://www.bing.com/az/hprichbg/rb/BodleianLibrary_ZH-CN13371852606_150x150.jpg",
37             "http://www.bing.com/az/hprichbg/rb/HeartNebula_ZH-CN7750020667_150x150.jpg",
38             "http://www.bing.com/az/hprichbg/rb/HotAndCold_ZH-CN8140560654_150x150.jpg"
39         };
40 
41         public ImageBugPage()
42         {
43             this.InitializeComponent();
44         }
45 
46         /// <summary>
47         /// 在此页将要在 Frame 中显示时进行调用。
48         /// </summary>
49         /// <param name="e">描述如何访问此页的事件数据。
50         /// 此参数通常用于配置页。</param>
51         protected override void OnNavigatedTo(NavigationEventArgs e)
52         {
53             HardwareButtons.BackPressed += HardwareButtons_BackPressed;
54         }
55 
56         protected override void OnNavigatedFrom(NavigationEventArgs e)
57         {
58             HardwareButtons.BackPressed -= HardwareButtons_BackPressed;
59         }
60 
61         private void HardwareButtons_BackPressed(object sender, BackPressedEventArgs e)
62         {
63             if (Frame.CanGoBack)
64             {
65                 e.Handled = true;
66                 Frame.GoBack();
67             }
68         }
69 
70         private void BtnLoad_Click(object sender, RoutedEventArgs e)
71         {
72             lvwImage.ItemsSource = _testUrl;
73         }
74 
75         private void Image_ImageFailed(object sender, ExceptionRoutedEventArgs e)
76         {
77             Debug.WriteLine(e.ErrorMessage);
78         }
79     }
80 }
    ImageBug后台

    测试效果：

    出现了其中一幅无法加载的情况

    而我们的调试窗口也显示出了无法加载的信息。

    解决方案：捕获到加载失败时，重新设定Image控件的Source属性。

    修改上面的后台代码中的ImageFailed方法：

    PS：暂时未知win8.1 store app上也是否会出现这个问题，有时间的博友可以帮忙测试一下。

    最后附上测试的代码及解决的代码的整个工程：BugDemo.zip
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  • 原文地址：https://www.cnblogs.com/h82258652/p/4319101.html
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