背水一战 Windows 10 (41) - 控件(导航类): Frame
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原文:背水一战 Windows 10 (41) - 控件(导航类): Frame
作者:webabcd
介绍
背水一战 Windows 10 之 控件(导航类)
- Frame
示例
Controls/NavigationControl/FrameDemo.xaml
<Page x:Class="Windows10.Controls.NavigationControl.FrameDemo" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:Windows10.Controls.NavigationControl" 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="10 0 10 10" Orientation="Horizontal"> <StackPanel Width="400"> <Button Name="btnGotoFrame1" Content="导航至 Frame1" Click="btnGotoFrame1_Click" /> <Button Name="btnGotoFrame2" Content="导航至 Frame2" Click="btnGotoFrame2_Click" Margin="0 10 0 0" /> <Button Name="btnBack" Content="后退" Click="btnBack_Click" Margin="0 10 0 0" /> <Button Name="btnForward" Content="前进" Click="btnForward_Click" Margin="0 10 0 0" /> <TextBlock Name="lblMsg" TextWrapping="Wrap" Margin="0 10 0 0" /> </StackPanel> <Frame Name="frame" VerticalAlignment="Top" Margin="10 0 0 0" /> </StackPanel> </Grid> </Page>
Controls/NavigationControl/FrameDemo.xaml.cs
/* * Frame - 框架控件,用于导航内容(继承自 ContentControl, 请参见 /Controls/BaseControl/ContentControlDemo/) * BackStackDepth - 返回 stack 中的条目数 * BackStack - 返回向后导航历史记录的 PageStackEntry 实例的集合(可以根据需求对集合增删改查) * ForwardStack - 返回向前导航历史记录的 PageStackEntry 实例的集合(可以根据需求对集合增删改查) * CanGoBack - 可否可以向后导航 * CanGoForward - 可否可以向前导航 * GoBack() - 向后导航,可以指定过渡效果 * GoForward() - 向前导航 * Navigate() - 导航到指定的 Type,可以传递一个 object 类型的参数,可以指定过渡效果 * CurrentSourcePageType - 获取 Frame 当前内容的 Type * SourcePageType - 获取或设置 Frame 当前内容的 Type * * CacheSize - 所支持的最大缓存页数,默认值 10 * CacheSize 与被导航的页的 Page.NavigationCacheMode 属性相关(详见 Frame1.xaml.cs 和 Frame2.xaml.cs 的示例代码) * NavigationCacheMode.Disabled - 每次导航到页时,都重新实例化此页,默认值(CacheSize 无效) * NavigationCacheMode.Enabled - 每次导航到页时,首先缓存此页,此时如果已缓存的页数大于 CacheSize,则按先进先出的原则丢弃最早的缓存页(CacheSize 有效) * NavigationCacheMode.Required - 每次导航到页时,都缓存此页(CacheSize 无效) * * Navigating - 导航开始时触发的事件 * Navigated - 导航完成后触发的事件 * NavigationFailed - 导航失败时触发的事件 * NavigationStopped - 导航过程中,又请求了一个新的导航时触发的事件 * * GetNavigationState() - 获取 Frame 当前的导航状态,返回字符串类型的数据,仅当导航无参数传递或只传递简单参数(int, char, string, guid, bool 等)时有效 * SetNavigationState(string navigationState) - 将 Frame 还原到指定的导航状态 * * * PageStackEntry - 保存在 stack 中的页对象 * SourcePageType - 获取此页的类型 * Parameter - 获取之前导航至此页时的参数 * * * NavigationEventArgs - 导航的事件参数 * NavigationMode - 导航方式,只读(Windows.UI.Xaml.Navigation.NavigationMode 枚举) * New, Back, Forward, Refresh * Parameter - 传递给导航目标页的参数,只读 * SourcePageType - 导航的目标页的类型,只读 * * * 注: * 1、关于导航过程中的过渡效果请参见 /Animation/ThemeTransition/NavigationTransitionInfo/ 中的内容 * 2、Frame 中与过渡效果有关的是 GoBack() 和 Navigate() 中的 NavigationTransitionInfo 类型的参数 */ using System; using Windows.UI.Xaml; using Windows.UI.Xaml.Controls; using Windows.UI.Xaml.Navigation; namespace Windows10.Controls.NavigationControl { public sealed partial class FrameDemo : Page { public FrameDemo() { this.InitializeComponent(); } protected override void OnNavigatedTo(NavigationEventArgs e) { frame.Navigated += frame_Navigated; } void frame_Navigated(object sender, NavigationEventArgs e) { lblMsg.Text = "CacheSize: " + frame.CacheSize; lblMsg.Text += Environment.NewLine; lblMsg.Text += "BackStackDepth: " + frame.BackStackDepth; lblMsg.Text += Environment.NewLine; lblMsg.Text += "CanGoBack: " + frame.CanGoBack; lblMsg.Text += Environment.NewLine; lblMsg.Text += "CanGoForward: " + frame.CanGoForward; lblMsg.Text += Environment.NewLine; lblMsg.Text += "CurrentSourcePageType: " + frame.CurrentSourcePageType; lblMsg.Text += Environment.NewLine; // 显示 frame 的当前的导航状态,记录此值后,可以在需要的时候通过 SetNavigationState() 将 frame 还原到指定的导航状态 lblMsg.Text += "NavigationState: " + frame.GetNavigationState(); } private void btnGotoFrame1_Click(object sender, RoutedEventArgs e) { frame.Navigate(typeof(Frame1), "param1"); } private void btnGotoFrame2_Click(object sender, RoutedEventArgs e) { frame.SourcePageType = typeof(Frame2); } private void btnBack_Click(object sender, RoutedEventArgs e) { if (frame.CanGoBack) frame.GoBack(); } private void btnForward_Click(object sender, RoutedEventArgs e) { if (frame.CanGoForward) frame.GoForward(); } } }
Controls/NavigationControl/Frame1.xaml
<Page x:Class="Windows10.Controls.NavigationControl.Frame1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:Windows10.Controls.NavigationControl" 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="10 0 10 10"> <TextBlock Name="lblMsg" Margin="5" TextWrapping="Wrap" /> </StackPanel> </Grid> </Page>
Controls/NavigationControl/Frame1.xaml.cs
using System; using Windows.UI.Xaml.Controls; using Windows.UI.Xaml.Navigation; namespace Windows10.Controls.NavigationControl { public sealed partial class Frame1 : Page { public Frame1() { this.InitializeComponent(); /* * Page.NavigationCacheMode - 使用 Frame 导航到此页面时,页面的缓存模式 * Disabled - 每次导航到页时,都重新实例化此页,默认值(Frame.CacheSize 无效) * Enabled - 每次导航到页时,首先缓存此页,此时如果已缓存的页数大于 Frame.CacheSize,则按先进先出的原则丢弃最早的缓存页(Frame.CacheSize 有效) * Required - 每次导航到页时,都缓存此页(Frame.CacheSize 无效) */ this.NavigationCacheMode = Windows.UI.Xaml.Navigation.NavigationCacheMode.Enabled; this.Loaded += Frame1_Loaded; } void Frame1_Loaded(object sender, Windows.UI.Xaml.RoutedEventArgs e) { lblMsg.Text += Environment.NewLine; lblMsg.Text += "Loaded: " + DateTime.Now.ToString(); } // 来了 protected override void OnNavigatedTo(NavigationEventArgs e) { lblMsg.Text += Environment.NewLine; lblMsg.Text += "OnNavigatedTo: " + DateTime.Now.ToString(); lblMsg.Text += " param: " + (string)e.Parameter; } // 准备走了,但是可以取消 protected override void OnNavigatingFrom(NavigatingCancelEventArgs e) { lblMsg.Text += Environment.NewLine; lblMsg.Text += "OnNavigatingFrom(NavigatingCancelEventArgs): " + DateTime.Now.ToString(); lblMsg.Text += " param: " + (string)e.Parameter; } // 已经走了 protected override void OnNavigatedFrom(NavigationEventArgs e) { lblMsg.Text += Environment.NewLine; lblMsg.Text += "OnNavigatedFrom(NavigationEventArgs): " + DateTime.Now.ToString(); lblMsg.Text += " param: " + (string)e.Parameter; } } }
Controls/NavigationControl/Frame2.xaml
<Page x:Class="Windows10.Controls.NavigationControl.Frame2" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:Windows10.Controls.NavigationControl" 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="10 0 10 10"> <TextBlock Name="lblMsg" Margin="5" TextWrapping="Wrap" /> </StackPanel> </Grid> </Page>
Controls/NavigationControl/Frame2.xaml.cs
using System; using Windows.UI.Xaml.Controls; using Windows.UI.Xaml.Navigation; namespace Windows10.Controls.NavigationControl { public sealed partial class Frame2 : Page { public Frame2() { this.InitializeComponent(); /* * Page.NavigationCacheMode - 使用 Frame 导航到此页面时,页面的缓存模式 * Disabled - 每次导航到页时,都重新实例化此页,默认值(Frame.CacheSize 无效) * Enabled - 每次导航到页时,首先缓存此页,此时如果已缓存的页数大于 Frame.CacheSize,则按先进先出的原则丢弃最早的缓存页(Frame.CacheSize 有效) * Required - 每次导航到页时,都缓存此页(Frame.CacheSize 无效) */ this.NavigationCacheMode = Windows.UI.Xaml.Navigation.NavigationCacheMode.Enabled; this.Loaded += Frame2_Loaded; } void Frame2_Loaded(object sender, Windows.UI.Xaml.RoutedEventArgs e) { lblMsg.Text += Environment.NewLine; lblMsg.Text += "Loaded: " + DateTime.Now.ToString(); } protected override void OnNavigatedTo(NavigationEventArgs e) { lblMsg.Text += Environment.NewLine; lblMsg.Text += "OnNavigatedTo: " + DateTime.Now.ToString(); } } }
OK
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