重新想象 Windows 8 Store Apps (9)

来源：互联网发布：开票软件000013 编辑：程序博客网时间：2024/05/29 04:28

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重新想象 Windows 8 Store Apps (9) - 控件之 ScrollViewer 基础

作者：webabcd

介绍
重新想象 Windows 8 Store Apps 之 ScrollViewer

演示 ScrollViewer 的基本应用
演示 ScrollBar 的基本应用
演示 ScrollContentPresenter 的基本应用

示例
1、ScrollViewer 的基本应用
ScrollViewer/Demo.xaml

<Page    x:Class="XamlDemo.Controls.ScrollViewer.Demo"    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">                        <TextBlock Name="lblMsg" />            <!--                ScrollViewer - 滚动视图控件                    Content - 滚动视图内的内容                    IsDeferredScrollingEnabled - 是否启用延迟滚动，在滚动内容过多时，启用延迟混动可以改善性能，默认值为 false                    HorizontalScrollMode - 水平滚动条的行为方式，Windows.UI.Xaml.Controls.ScrollMode枚举（Disabled, Enabled, Auto）                    VerticalScrollMode - 垂直滚动条的行为方式                    HorizontalScrollBarVisibility - 水平滚动条的可见性，Windows.UI.Xaml.Controls.ScrollBarVisibility枚举（Disabled, Auto, Hidden, Visible）                    VerticalScrollBarVisibility - 垂直滚动条的可见性                    ViewChanged - 发生滚动时所触发的事件            -->            <ScrollViewer Name="scrollViewer" Width="400" Height="400" Margin="0 10 0 0" HorizontalAlignment="Left"                          IsDeferredScrollingEnabled="False"                          ViewChanged="scrollViewer_ViewChanged_1"                          HorizontalScrollMode="Enabled" VerticalScrollMode="Enabled"                          HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Visible">                <ScrollViewer.Content>                    <Image Source="/Assets/Logo.png" Width="1000" />                </ScrollViewer.Content>            </ScrollViewer>                        <StackPanel Orientation="Horizontal">                <!--使 ScrollViewer 里的内容滚动到相对于 ScrollViewer 居中-->                <Button Content="居中" Click="Button_Click_1" />            </StackPanel>                   </StackPanel>    </Grid></Page>

ScrollViewer/Demo.xaml.cs

/* * ScrollViewer - 滚动视图控件 *  * 本例用于演示 ScrollViewer 的基本用法 */using Windows.UI.Xaml;using Windows.UI.Xaml.Controls;namespace XamlDemo.Controls.ScrollViewer{    public sealed partial class Demo : Page    {        public Demo()        {            this.InitializeComponent();        }        private void scrollViewer_ViewChanged_1(object sender, ScrollViewerViewChangedEventArgs e)        {            lblMsg.Text = "";            /*             * ScrollViewer - 滚动视图控件             *     ComputedHorizontalScrollBarVisibility - 当前水平滚动条的可见性，比如当 HorizontalScrollBarVisibility 设置为 Auton 时，可以通过 ComputedHorizontalScrollBarVisibility 来判断当前水平滚动条是否可见             *     ComputedVerticalScrollBarVisibility - 当前垂直滚动条的可见性             *     ExtentWidth - ScrollViewer 内的内容的宽             *     ExtentHeight - ScrollViewer 内的内容的高             *     ViewportWidth - 可视区的宽             *     ViewportHeight - 可视区的高             *     HorizontalOffset - 滚动内容的水平方向的偏移量             *     VerticalOffset - 滚动内容的垂直方向的偏移量             *     ScrollableWidth - 可滚动区域的水平方向的大小             *     ScrollableHeight - 可滚动区域的垂直方向的大小             *                  *     ScrollToHorizontalOffset() - 滚动到指定的水平偏移位置             *     ScrollToVerticalOffset() - 滚动到指定的垂直偏移位置             */            lblMsg.Text += "ComputedHorizontalScrollBarVisibility: " + scrollViewer.ComputedHorizontalScrollBarVisibility;            lblMsg.Text += "\r\n";            lblMsg.Text += "ComputedVerticalScrollBarVisibility: " + scrollViewer.ComputedVerticalScrollBarVisibility;            lblMsg.Text += "\r\n";            lblMsg.Text += "ExtentWidth: " + scrollViewer.ExtentWidth;            lblMsg.Text += "\r\n";            lblMsg.Text += "ExtentHeight: " + scrollViewer.ExtentHeight;            lblMsg.Text += "\r\n";            lblMsg.Text += "ViewportWidth: " + scrollViewer.ViewportWidth;            lblMsg.Text += "\r\n";            lblMsg.Text += "ViewportHeight: " + scrollViewer.ViewportHeight;            lblMsg.Text += "\r\n";            lblMsg.Text += "HorizontalOffset: " + scrollViewer.HorizontalOffset;            lblMsg.Text += "\r\n";            lblMsg.Text += "VerticalOffset: " + scrollViewer.VerticalOffset;            lblMsg.Text += "\r\n";            lblMsg.Text += "ScrollableWidth: " + scrollViewer.ScrollableWidth;            lblMsg.Text += "\r\n";            lblMsg.Text += "ScrollableHeight: " + scrollViewer.ScrollableHeight;            lblMsg.Text += "\r\n";        }        private void Button_Click_1(object sender, RoutedEventArgs e)        {            scrollViewer.ScrollToHorizontalOffset(scrollViewer.ScrollableWidth / 2);            scrollViewer.ScrollToVerticalOffset(scrollViewer.ScrollableHeight / 2);        }    }}

2、ScrollBar 的基本应用
ScrollViewer/ScrollBarDemo.xaml

<Page    x:Class="XamlDemo.Controls.ScrollViewer.ScrollBarDemo"    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">                        <TextBlock Name="lblMsg" FontSize="14.667" HorizontalAlignment="Left" />            <ScrollViewer Name="scrollViewer" Width="400" Height="200" HorizontalAlignment="Left">                <Image Source="/Assets/Logo.png" Width="1000" />            </ScrollViewer>                    </StackPanel>    </Grid></Page>

ScrollViewer/ScrollBarDemo.xaml.cs

/* * ScrollBar - 滚动条控件 *  * 本例通过访问 ScrollViewer 内的名为 VerticalScrollBar 的 ScrollBar 控件，来简要说明 ScrollBar 控件 */using Windows.UI.Xaml;using Windows.UI.Xaml.Controls;using Windows.UI.Xaml.Controls.Primitives;using XamlDemo.Common;namespace XamlDemo.Controls.ScrollViewer{    public sealed partial class ScrollBarDemo : Page    {        public ScrollBarDemo()        {            this.InitializeComponent();            this.Loaded += ScrollBarDemo_Loaded;        }        void ScrollBarDemo_Loaded(object sender, RoutedEventArgs e)        {            // 找到 ScrollViewer 内的名为 VerticalScrollBar 的 ScrollBar 控件，即 ScrollViewer 内的垂直滚动条            var scrollBar = Helper.GetVisualChild<ScrollBar>(scrollViewer, "VerticalScrollBar");            // ValueChanged - 当滚动条的值发生改变是所触发的事件            scrollBar.ValueChanged += scrollBar_ValueChanged;        }        void scrollBar_ValueChanged(object sender, RangeBaseValueChangedEventArgs e)        {            // 显示垂直滚动条的当前值            lblMsg.Text = e.NewValue.ToString();        }    }}

3、ScrollContentPresenter 的基本应用
ScrollViewer/ScrollContentPresenterDemo.xaml

<Page    x:Class="XamlDemo.Controls.ScrollViewer.ScrollContentPresenterDemo"    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 Name="scrollViewer" Width="400" Height="400" Background="Blue" HorizontalAlignment="Left"                          HorizontalScrollMode="Enabled" VerticalScrollMode="Enabled"                          HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Visible">                <ScrollViewer.Content>                    <Image Source="/Assets/Logo.png" Width="1000" />                </ScrollViewer.Content>            </ScrollViewer>        </StackPanel>    </Grid></Page>

ScrollViewer/ScrollContentPresenterDemo.xaml.cs

/* * ScrollContentPresenter - ScrollViewer 的内容呈现器（类似的有 ContentPresenter, ItemsPresenter） *  * ScrollContentPresenter 用来呈现 ScrollViewer 的 Content */using Windows.UI.Xaml;using Windows.UI.Xaml.Controls;using XamlDemo.Common;namespace XamlDemo.Controls.ScrollViewer{    public sealed partial class ScrollContentPresenterDemo : Page    {        public ScrollContentPresenterDemo()        {            this.InitializeComponent();            this.Loaded += ScrollContentPresenterDemo_Loaded;        }        void ScrollContentPresenterDemo_Loaded(object sender, RoutedEventArgs e)        {            // 找到 ScrollViewer 内的名为 ScrollContentPresenter 的 ScrollContentPresenter 控件            var scrollContentPresenter = Helper.GetVisualChild<ScrollContentPresenter>(scrollViewer, "ScrollContentPresenter");                        scrollContentPresenter.Margin = new Thickness(100);        }    }}

OK
[源码下载]