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【万里征程――Windows App开发】SemanticZoom视图切换

来源：程序员人生发布时间：2015-04-21 08:31:11 阅读次数：3570次

相信誉过Windows Phone或Windows 8/8.1/10的朋友对下面这张截图肯定不陌生。这就是通过SemanticZoom来实现的，当数据过量时，这类控件特别适用。它有1个放大视图ZoomedInView和1个缩小试图ZoomedOutView，前者主要用来显示当前页面的详细信息，后者则致力于快速导航。

这里写图片描述

那末我就自己来动手实践咯，首先我们在XAML中添加大致的界面，就像画画要先画轮廓1样。

<Grid Name="grid1" Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <SemanticZoom x:Name="semanticZoom" VerticalAlignment="Center" HorizontalAlignment="Center">   
            <SemanticZoom.ZoomedOutView>

            </SemanticZoom.ZoomedOutView>

            <SemanticZoom.ZoomedInView>

            </SemanticZoom.ZoomedInView>

        </SemanticZoom>
    </Grid>

然后分别在这两个视图中添加你想要加入的东西。这里的核心就是，ZoomedOutView和ZoomedInView都是使用的同1个CollectionViewSource对象作为自己的数据集的。而这个属性我们在上1节谈到过：【万里征程――Windows App开发】ListView&GridView之分组。

我们先把后台代码写好。我就像1篇那样装腔作势写1个类吧^_^

    public class Alarm
    {
        public string Title { get; set; }
        public DateTime AlarmClockTime { get; set; }
        public string Description { get; set; }         
    }

然后用1个函数来添加1大堆数据……1大堆数据。

private Alarm[] AddAlarmData()
{
     return new Alarm[]
     {
          new Alarm {Title="Alarm 1",AlarmClockTime=globalTime.AddHours(17),Description="First Alarm for Study" },
          new Alarm {Title="Alarm 2",AlarmClockTime=globalTime.AddHours(2),Description="Second Alarm for Study" },
         new Alarm {Title="Alarm 3",AlarmClockTime=globalTime.AddHours(7),Description="Third Alarm for Study" },
         new Alarm {Title="Alarm 4",AlarmClockTime=globalTime.AddHours(4),Description="4th Alarm for Study" },
         new Alarm {Title="Alarm 5",AlarmClockTime=globalTime.AddHours(5),Description="First Alarm for Fun" },
         new Alarm {Title="Alarm 6",AlarmClockTime=globalTime.AddHours(1),Description="First Alarm for Fun" },
         new Alarm {Title="Alarm 7",AlarmClockTime=globalTime.AddHours(15),Description="Second Alarm for Fun" },
         new Alarm {Title="Alarm 8",AlarmClockTime=globalTime.AddHours(9),Description="Third Alarm for Fun" },
         new Alarm {Title="Alarm 9",AlarmClockTime=globalTime.AddHours(20),Description="4th Alarm for Fun" },
         new Alarm {Title="Alarm 10",AlarmClockTime=globalTime.AddHours(14),Description="Second Alarm for Sleep" },
         new Alarm {Title="Alarm 11",AlarmClockTime=globalTime.AddHours(9),Description="First Alarm for Sleep" }
     };
}

由于我们最后要把放大视图变成缩藐视图，记得缩藐视图上面有1些ABCD之类的字母么，这里我们用的是时间，就分成中午晚上等好啦。就通过下面这样的1个函数来弄定。其用了1个键值对，用time作为参数。后面再将这些数据挑选出来，绑定到新添加的CollectionViewSource中。至于gridView1和gridView2是行将添加到XAML中，这里可以先不填，1回再补上。

Func<int, string> SwitchTime = (time) =>
{
    if (time <= 10 && time >= 6)
         return "上午";
    else if (time > 10 && time < 14)
         return "中午";
    else if (time >= 14 && time <= 20)
         return "下午";
    else
         return "晚上";      
};
var varTime = from t in AddAlarmData()
              orderby t.AlarmClockTime.Hour
              group t by SwitchTime(t.AlarmClockTime.Hour);
CollectionViewSource collectionVS = new CollectionViewSource();
collectionVS.IsSourceGrouped = true;
collectionVS.Source = varTime;
this.gridView1.ItemsSource = collectionVS.View.CollectionGroups;
this.gridView2.ItemsSource = collectionVS.View;

我们先来写主视图（也就是放大视图）。

<GridView x:Name="gridView2" IsSwipeEnabled="True" HorizontalAlignment="Center" VerticalAlignment="Center" ScrollViewer.IsHorizontalScrollChainingEnabled="False" Width="1800" Height="1000">
     <GridView.ItemTemplate>
         <DataTemplate>
             <StackPanel Orientation="Horizontal" Margin="12" HorizontalAlignment="Left" Background="White">
                  <TextBlock Text="{Binding Title}" TextWrapping="Wrap" Foreground="Red"  FontFamily="Harrington"
Width="150" Height="100" FontSize="26" FontWeight="Light"/>
                  <TextBlock Text="{Binding AlarmClockTime}"  Foreground="Red" TextWrapping="Wrap" Width="150"  Height="100"      FontFamily="Harrington" FontSize="26" FontWeight="Light"/>
                  <TextBlock Text="{Binding Description}"  Foreground="Red" TextWrapping="Wrap" Width="150"  Height="100"       FontFamily="Harrington" FontSize="26" FontWeight="Light"/>
              </StackPanel>
          </DataTemplate>
      </GridView.ItemTemplate>
      <GridView.ItemsPanel>
           <ItemsPanelTemplate>
                <ItemsWrapGrid MaximumRowsOrColumns="8"/>
           </ItemsPanelTemplate>
      </GridView.ItemsPanel>
      <GridView.GroupStyle>
           <GroupStyle>
                 <GroupStyle.HeaderTemplate>
                      <DataTemplate>
                           <TextBlock Text='{Binding Key}' Foreground="{StaticResource ApplicationForegroundThemeBrush}" Margin="12" FontSize="30" FontFamily="华文采云" FontWeight="ExtraBold" />
                      </DataTemplate>
                 </GroupStyle.HeaderTemplate>
            </GroupStyle>
      </GridView.GroupStyle>
</GridView>

相信大家都能看得懂，另外稍后我会在截图中添加1些注释的哦。然后是缩藐视图。

<GridView Name="gridView1" Background="Wheat" ScrollViewer.IsHorizontalScrollChainingEnabled="False" HorizontalAlignment="Center" VerticalAlignment="Center" Width="600" Height="200">
    <GridView.ItemTemplate>
        <DataTemplate>
            <TextBlock Width="100" Height="100" Text="{Binding Group.Key}" FontFamily="华文行楷" FontWeight="Normal" FontSize="24" />
         </DataTemplate>
    </GridView.ItemTemplate>
    <GridView.ItemsPanel>
         <ItemsPanelTemplate>
              <ItemsWrapGrid ItemWidth="100" ItemHeight="100" MaximumRowsOrColumns="2"/>
          </ItemsPanelTemplate>
     </GridView.ItemsPanel>
     <GridView.ItemContainerStyle>
          <Style TargetType="GridViewItem">
              <Setter Property="Margin" Value="12" />
              <Setter Property="Padding" Value="3" />
              <Setter Property="BorderThickness" Value="1" />
              <Setter Property="Background" Value="Green"/>
          </Style>
     </GridView.ItemContainerStyle>
</GridView>