原文:重新想象 Windows 8 Store Apps (10) - 控件之 ScrollViewer 特性: Chaining, Rail, Inertia, Snap, Zoom
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重新想象 Windows 8 Store Apps (10) - 控件之 ScrollViewer 特性: Chaining, Rail, Inertia, Snap, Zoom
作者：webabcd
介绍
重新想象 Windows 8 Store Apps 之 ScrollViewer
- Chaining - 锁链
- Rail - 轨道
- Inertia - 惯性
- Snap - 对齐
- Zoom - 缩放
示例
1、演示 ScrollViewer 的 Chaining 特性
ScrollViewer/Chaining.xaml
<Page
x:Class="XamlDemo.Controls.ScrollViewer.Chaining"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:XamlDemo.Controls.ScrollViewer"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="Transparent">
<StackPanel Margin="120 0 0 0">
<ScrollViewer>
<StackPanel>
<TextBlock Text="我是参照物" FontSize="14.667" />
<!--
Chaining: 锁链，在触摸模式下，滚动本 ScrollViewer 如果超出了边界，则滚动其父 ScrollViewer
本例的测试方法：在触摸模式下，滚动 ScrollViewer 内的内容直至超出边界，超出边界后不要停下来继续滚动，通过“我是参照物”观察父 ScrollViewer 是否也被滚动
IsHorizontalScrollChainingEnabled - 是否启用水平方向上的 Chaining，默认值为 true
IsVerticalScrollChainingEnabled - 是否启用垂直方向上的 Chaining，默认值为 true
-->
<ScrollViewer Name="scrollViewer" Width="400" Height="400" Margin="0 10 0 0" HorizontalAlignment="Left"
HorizontalScrollMode="Enabled" VerticalScrollMode="Enabled"
HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Visible"
IsHorizontalScrollChainingEnabled="{Binding IsChecked, ElementName=chkIsHorizontalScrollChainingEnabled}"
IsVerticalScrollChainingEnabled="{Binding IsChecked, ElementName=chkIsVerticalScrollChainingEnabled}">
<Image Source="/Assets/Logo.png" Width="1000" />
</ScrollViewer>
<StackPanel Orientation="Horizontal">
<CheckBox Name="chkIsHorizontalScrollChainingEnabled" Content="IsHorizontalScrollChainingEnabled" IsChecked="True" Margin="10 0 0 0" />
<CheckBox Name="chkIsVerticalScrollChainingEnabled" Content="IsVerticalScrollChainingEnabled" IsChecked="True" Margin="10 0 0 0" />
</StackPanel>
</StackPanel>
</ScrollViewer>
</StackPanel>
</Grid>
</Page>
2、演示 ScrollViewer 的 Rail 特性
ScrollViewer/Rail.xaml
<Page
x:Class="XamlDemo.Controls.ScrollViewer.Rail"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:XamlDemo.Controls.ScrollViewer"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="Transparent">
<StackPanel Margin="120 0 0 0">
<!--
Rail: 轨道，在触摸模式下，假设沿水平方向滚动，则由于轨道的作用，在松手前只能延水平方向滚动（即使手指有垂直方向的滚动也无用）
IsHorizontalRailEnabled - 是否启用水平方向上的轨道，默认值为 true
IsVerticalRailEnabled - 是否启用垂直方向上的轨道，默认值为 true
-->
<ScrollViewer Name="scrollViewer2" Width="400" Height="400" Margin="0 10 0 0" HorizontalAlignment="Left"
HorizontalScrollMode="Enabled" VerticalScrollMode="Enabled"
HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Visible"
IsHorizontalRailEnabled="{Binding IsChecked, ElementName=chkIsHorizontalRailEnabled}"
IsVerticalRailEnabled="{Binding IsChecked, ElementName=chkIsVerticalRailEnabled}">
<Image Source="/Assets/Logo.png" Width="1000" />
</ScrollViewer>
<StackPanel Orientation="Horizontal">
<CheckBox Name="chkIsHorizontalRailEnabled" Content="IsHorizontalRailEnabled" IsChecked="True" />
<CheckBox Name="chkIsVerticalRailEnabled" Content="IsVerticalRailEnabled" IsChecked="True" Margin="10 0 0 0" />
</StackPanel>
</StackPanel>
</Grid>
</Page>
3、演示 ScrollViewer 的 Inertia 特性
ScrollViewer/Inertia.xaml
<Page
x:Class="XamlDemo.Controls.ScrollViewer.Inertia"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:XamlDemo.Controls.ScrollViewer"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="Transparent">
<StackPanel Margin="120 0 0 0">
<!--
Inertia: 惯性，在触摸模式下，用一个加速度滚动内容，松手后内容会具有惯性滚动效果
IsScrollInertiaEnabled - 是否启用惯性效果，默认值为 true
-->
<ScrollViewer Name="scrollViewer2" Width="400" Height="400" Margin="0 10 0 0" HorizontalAlignment="Left"
HorizontalScrollMode="Enabled" VerticalScrollMode="Enabled"
HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Visible"
IsScrollInertiaEnabled="{Binding IsChecked, ElementName=chkIsScrollInertiaEnabled}">
<Image Source="/Assets/Logo.png" Width="1000" />
</ScrollViewer>
<StackPanel Orientation="Horizontal">
<CheckBox Name="chkIsScrollInertiaEnabled" Content="IsScrollInertiaEnabled" IsChecked="True" />
</StackPanel>
</StackPanel>
</Grid>
</Page>
4、演示 ScrollViewer 的 Snap 特性
ScrollViewer/Snap.xaml
<Page
x:Class="XamlDemo.Controls.ScrollViewer.Snap"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:XamlDemo.Controls.ScrollViewer"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="Transparent">
<StackPanel Margin="120 0 0 0">
<!--用于设置 ScrollViewer 的 HorizontalSnapPointsType-->
<ComboBox Name="comboBox" SelectedIndex="0" SelectionChanged="ComboBox_SelectionChanged_1" HorizontalAlignment="Left">
<ComboBoxItem>HorizontalSnapPointsType = SnapPointsType.None</ComboBoxItem>
<ComboBoxItem>HorizontalSnapPointsType = SnapPointsType.Optional</ComboBoxItem>
<ComboBoxItem>HorizontalSnapPointsType = SnapPointsType.Mandatory</ComboBoxItem>
</ComboBox>
<ScrollViewer x:Name="scrollViewer" Width="400" Height="200" HorizontalAlignment="Left" Margin="0 10 0 0"
HorizontalScrollMode="Enabled" VerticalScrollMode="Enabled"
HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Visible">
<StackPanel Orientation="Horizontal">
<Image Width="400" Height="200" Stretch="Fill" Source="/Assets/Logo.png" />
<Image Width="400" Height="200" Stretch="Fill" Source="/Assets/NineGrid/Demo.png" />
<Image Width="350" Height="200" Stretch="Fill" Source="/Assets/Logo.png" />
<Image Width="450" Height="200" Stretch="Fill" Source="/Assets/NineGrid/Demo.png" />
<Image Width="400" Height="200" Stretch="Fill" Source="/Assets/Logo.png" />
<TextBox Width="400" Height="200" FontSize="26.67" Text="message" Name="txtMsg" />
<TextBox Width="400" Height="200" FontSize="26.67" Text="message2" Name="txtMsg2" />
<TextBox Width="400" Height="200" FontSize="26.67" Text="message3" Name="txtMsg3" />
</StackPanel>
</ScrollViewer>
<!--用于演示通过程序定位到 ScrollViewer 内的指定元素-->
<Button Content="滚动到 txtMsg2" Click="Button_Click_1" Margin="0 10 0 0" />
</StackPanel>
</Grid>
</Page>
ScrollViewer/Snap.xaml.cs
/*
* Snap: 对齐，在触摸模式下，如果 ScrollViewer 有多个元素，在滚动结束后会定位到其中某一个具体的元素，这就叫对齐
*
* HorizontalSnapPointsType - 水平方向上的对齐行为，Windows.UI.Xaml.Controls.SnapPointsType枚举
* SnapPointsType.None - 不需要对齐，默认值
* SnapPointsType.Optional - 看情况，如果离某个元素很近则对齐此元素
* SnapPointsType.Mandatory - 强制对齐，必须对齐到某一元素
* SnapPointsType.OptionalSingle - 仅对 Zoom 对齐有用
* SnapPointsType.MandatorySingle - 仅对 Zoom 对齐有用
* VerticalSnapPointsType - 垂直方向上的对齐行为
*
*
* HorizontalSnapPointsAlignment - 水平方向上的对齐方式，Windows.UI.Xaml.Controls.Primitives.SnapPointsAlignment枚举
* SnapPointsAlignment.Near - 元素的左侧对齐 ScrollViewer 的左侧边界，默认值
* SnapPointsAlignment.Center - 元素的中心点对齐 ScrollViewer 的中心点
* SnapPointsAlignment.Far - 元素的右侧对齐 ScrollViewer 的右侧边界
* VerticalSnapPointsAlignment - 垂直方向上的对齐方式
*
*
* BringIntoViewOnFocusChange - ScrollViewer 内的某元素获得焦点后，是否需要定位到此元素，默认值为 true
*/
using Windows.UI.Xaml.Controls;
namespace XamlDemo.Controls.ScrollViewer
{
public sealed partial class Snap : Page
{
public Snap()
{
this.InitializeComponent();
this.Loaded += Snap_Loaded;
}
void Snap_Loaded(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
scrollViewer.HorizontalSnapPointsAlignment = Windows.UI.Xaml.Controls.Primitives.SnapPointsAlignment.Near;
scrollViewer.BringIntoViewOnFocusChange = true;
}
private void ComboBox_SelectionChanged_1(object sender, SelectionChangedEventArgs e)
{
if (scrollViewer != null && comboBox != null)
{
switch (comboBox.SelectedIndex)
{
case 0:
scrollViewer.HorizontalSnapPointsType = SnapPointsType.None;
break;
case 1:
scrollViewer.HorizontalSnapPointsType = SnapPointsType.Optional;
break;
case 3:
scrollViewer.HorizontalSnapPointsType = SnapPointsType.Mandatory;
break;
default:
scrollViewer.HorizontalSnapPointsType = SnapPointsType.None;
break;
}
}
}
private void Button_Click_1(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
// 当 BringIntoViewOnFocusChange 为 true 时，如果 txtMsg2 获得焦点，则 ScrollViewer 会自动滚动到 txtMsg2
txtMsg2.Focus(Windows.UI.Xaml.FocusState.Programmatic);
}
}
}
5、演示 ScrollViewer 的 Zoom 特性
ScrollViewer/Zoom.xaml
<Page
x:Class="XamlDemo.Controls.ScrollViewer.Zoom"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:XamlDemo.Controls.ScrollViewer"
xmlns:sys="using:System"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="Transparent">
<StackPanel Margin="120 0 0 0">
<!--
Zoom - 放大/缩小
ZoomMode - 是否启用“放大/缩小”功能（Disabled, Enabled），默认值为 Enabled
MaxZoomFactor - 内容放大的最大倍数，默认值 10
MinZoomFactor - 内容放大的最小倍数，默认值 0.1
-->
<ScrollViewer Name="scrollViewer" Width="400" Height="400" HorizontalAlignment="Left"
ZoomMode="Enabled" MaxZoomFactor="2" MinZoomFactor="0.5">
<Image Source="/Assets/Logo.png" Width="400" Height="400" />
</ScrollViewer>
<Button Click="Button_Click_1" Content="放大/缩小到 0.1 倍" />
</StackPanel>
</Grid>
</Page>
ScrollViewer/Zoom.xaml.cs
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
namespace XamlDemo.Controls.ScrollViewer
{
public sealed partial class Zoom : Page
{
public Zoom()
{
this.InitializeComponent();
this.Loaded += Zoom_Loaded;
}
void Zoom_Loaded(object sender, RoutedEventArgs e)
{
/*
* ZoomSnapPoints - “放大/缩小”的对齐点的集合，默认是空的
*
* ZoomSnapPointsType - “放大/缩小”的对齐行为
* SnapPointsType.None - 不需要对齐，默认值
* SnapPointsType.Optional - 看情况，如果离某个对齐点很近则对齐
* SnapPointsType.Mandatory - 强制对齐，必须对齐到某一个对齐点
* SnapPointsType.OptionalSingle - 同 Optional，但不能跳过对齐点
* SnapPointsType.MandatorySingle - 同 Mandatory，但不能跳过对齐点
*
* IsZoomChainingEnabled - 是否启用 Zoom 的 Chaining
* IsZoomInertiaEnabled - 是否启用 Zoom 的 Inertia
* ZoomFactor - 获取当前的 Zoom 的倍数
*
* ZoomToFactor() - Zoom 到指定的倍数
*/
scrollViewer.ZoomSnapPointsType = SnapPointsType.OptionalSingle;
scrollViewer.ZoomSnapPoints.Add(0.5f);
scrollViewer.ZoomSnapPoints.Add(0.8f);
scrollViewer.ZoomSnapPoints.Add(1.0f);
scrollViewer.ZoomSnapPoints.Add(1.5f);
scrollViewer.ZoomSnapPoints.Add(2.0f);
}
private void Button_Click_1(object sender, RoutedEventArgs e)
{
scrollViewer.ZoomToFactor(0.1f);
}
}
}
OK
[源码下载]
时间： 2025-01-19 06:59:12