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  • UI: 概述, 启动屏幕, 屏幕方向

    UI 设计概述

    • 启动屏幕(闪屏)
    • 屏幕方向



    示例
    1、UI 设计概述
    UI/Summary.xaml

    复制代码
    <Page
        x:Class="Windows10.UI.Summary"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="using:Windows10.UI"
        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" TextWrapping="Wrap" Margin="0 10 10 10">
                    <Run>1、UWP - Universal Windows Platform</Run>
                    <LineBreak />
                    <Run>2、设计 UWP 应用时,要以有效像素(effective pixels)进行设计,而不是以物理像素(physical pixels)进行设计。因为系统会根据设备的像素密度和观看距离自动缩放</Run>
                    <LineBreak />
                    <Run>3、有效分辨率 - 以有效像素为单位的分辨率;物理分辨率 - 以物理像素为单位的分辨率</Run>
                    <LineBreak />
                    <Run>4、对于有效分辨率的理解可以参考 ios 的逻辑分辨率的概念,比如 iPhone 4s 的物理分辨率为 960 * 640,其逻辑分辨率为 480 * 320(设计时按照此分辨率设计)</Run>
                    <LineBreak />
                    <Run>5、有效分辨率和物理分辨率之间的比例是如何决定的呢?由系统根据设备的像素密度和观看距离来决定比例</Run>
                    <LineBreak />
                    <Run>6、当系统缩放 UI 时,会按 4 的倍数(multiples of 4, 从字面上理解不一定是整倍数)进行缩放。若要确保缩放后保持清晰的外观,请将你的设计贴靠到 4*4 像素网格,使 UI 元素的边距、大小和位置为 4 个有效像素的倍数</Run>
                </TextBlock>
    
            </StackPanel>
        </Grid>
    </Page>
    复制代码

     
    2、启动屏幕(闪屏)
    UI/MySplashScreen.xaml

    复制代码
    <Page
        x:Class="Windows10.UI.MySplashScreen"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="using:Windows10.UI"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d">
    
        <!--
            var color = (Color)this.Resources["SystemAccentColor"];
        -->
        <Grid Name="grid" Background="{ThemeResource SystemAccentColor}">
    
            <Image x:Name="splashImage" Source="/Assets/SplashScreen.png" HorizontalAlignment="Center" />
    
            <StackPanel Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Bottom" Margin="0 0 0 20">
                <ProgressRing IsActive="True" Foreground="White" />
                <TextBlock Name="lblMsg" Text="我是自定义启动页,1 秒后跳转到主页" Margin="0 10 0 0" />
            </StackPanel>
    
        </Grid>
    </Page>
    复制代码

    UI/MySplashScreen.xaml.cs

    复制代码
    /*
     * 演示如何自定义启动屏幕(闪屏)
     * 
     * 说明及应用场景:
     * 1、在 Package.appxmanifest 中可以设置 app 的启动屏幕,例如: <uap:SplashScreen Image="AssetsSplashScreen.png" BackgroundColor="#ff0000" />,其就是一个显示在窗口中间的图片(620 * 300)以及一个全窗口背景色
     * 2、在 app 的启动屏幕过后,可以显示一个自定义启动屏幕
     * 3、在自定义启动屏幕显示时,可以做一些程序的初始化工作,初始化完成后再进入主程序
     */
    
    using System;
    using System.Threading.Tasks;
    using Windows.ApplicationModel.Activation;
    using Windows.Foundation;
    using Windows.UI.Xaml;
    using Windows.UI.Xaml.Controls;
    
    namespace Windows10
    {
        using Windows10.UI;
    
        public partial class App
        {
            // partial method,实现了 App.xaml.cs 中的声明
            partial void OnLaunched_SplashScreen(LaunchActivatedEventArgs args)
            {
                // 启动后显示自定义启动屏幕
                if (args.PreviousExecutionState != ApplicationExecutionState.Running)
                {
                    MySplashScreen mySplashScreen = new MySplashScreen(args);
                    Window.Current.Content = mySplashScreen;
                }
            }
        }
    }
    
    namespace Windows10.UI
    {
        public sealed partial class MySplashScreen : Page
        {
            /*
             * SplashScreen - app 的启动屏幕对象,在 Application 中的若干事件处理器中的事件参数中均可获得
             *     ImageLocation - app 的启动屏幕的图片的位置信息,返回 Rect 类型对象
             *     Dismissed - app 的启动屏幕关闭时所触发的事件
             */
    
            // app 启动屏幕的相关信息
            private SplashScreen _splashScreen;
    
            public MySplashScreen()
            {
                this.InitializeComponent();
    
                lblMsg.Text = "自定义 app 的启动屏幕,打开 app 时可看到此页面的演示";
            }
    
            public MySplashScreen(LaunchActivatedEventArgs args)
            {
                this.InitializeComponent();
                
                ImplementCustomSplashScreen(args);
            }
    
            private async void ImplementCustomSplashScreen(LaunchActivatedEventArgs args)
            {
                // 窗口尺寸发生改变时,重新调整自定义启动屏幕
                Window.Current.SizeChanged += Current_SizeChanged;
    
                // 获取 app 的启动屏幕的相关信息
                _splashScreen = args.SplashScreen;
    
                // app 的启动屏幕关闭时所触发的事件
                _splashScreen.Dismissed += _splashScreen_Dismissed;
    
                // 获取 app 启动屏幕的图片的位置,并按此位置调整自定义启动屏幕的图片的位置
                Rect splashImageRect = _splashScreen.ImageLocation;
                splashImage.SetValue(Canvas.LeftProperty, splashImageRect.X);
                splashImage.SetValue(Canvas.TopProperty, splashImageRect.Y);
                splashImage.Height = splashImageRect.Height;
                splashImage.Width = splashImageRect.Width;
    
                await Task.Delay(1000);
    
                // 关掉自定义启动屏幕,跳转到程序主页面
                var rootFrame = new Frame();
                rootFrame.Navigate(typeof(MainPage), args);
                Window.Current.Content = rootFrame;
                Window.Current.Activate();
            }
    
            void Current_SizeChanged(object sender, Windows.UI.Core.WindowSizeChangedEventArgs e)
            {
                // 获取 app 启动屏幕的图片的最新位置,并按此位置调整自定义启动屏幕的图片的位置
                Rect splashImageRect = _splashScreen.ImageLocation;
                splashImage.SetValue(Canvas.LeftProperty, splashImageRect.X);
                splashImage.SetValue(Canvas.TopProperty, splashImageRect.Y);
                splashImage.Height = splashImageRect.Height;
                splashImage.Width = splashImageRect.Width;
            }
    
            private void _splashScreen_Dismissed(SplashScreen sender, object args)
            {
                // app 的启动屏幕关闭了
            }
        }
    }
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    3、屏幕方向
    UI/ScreenOrientation.xaml

    复制代码
    <Page
        x:Class="Windows10.UI.ScreenOrientation"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="using:Windows10.UI"
        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">
    
                <ToggleButton Name="btnLock" Content="锁定当前方向" IsChecked="False" Checked="btnLock_Checked" Unchecked="btnLock_Unchecked" />
    
                <TextBlock Name="lblMsg" Margin="0 10 0 0" />
    
            </StackPanel>
    
        </Grid>
    </Page>
    复制代码

    UI/ScreenOrientation.xaml.cs

    复制代码
    /*
     * 演示“屏幕方向”相关知识点
     */
    
    using System;
    using Windows.Graphics.Display;
    using Windows.UI.Xaml;
    using Windows.UI.Xaml.Controls;
    using Windows.UI.Xaml.Navigation;
    
    namespace Windows10.UI
    {
        public sealed partial class ScreenOrientation : Page
        {
            public ScreenOrientation()
            {
                this.InitializeComponent();
            }
    
            protected override void OnNavigatedTo(NavigationEventArgs e)
            {
                // 使用设备时的推荐方向,一般而言就是当“windows”键在下方时,设备的方向。手机一般是 Portrait,平板一般是 Landscape
                lblMsg.Text = "NativeOrientation: " + DisplayInformation.GetForCurrentView().NativeOrientation.ToString();
                lblMsg.Text += Environment.NewLine;
    
                // 设备的方向(Windows.Graphics.Display.DisplayOrientations 枚举:None, Landscape, Portrait, LandscapeFlipped, PortraitFlipped)
                // 注:LandscapeFlipped 是 Landscape 翻转了 180 度,PortraitFlipped 是 Portrait 翻转了 180 度
                // 注:Landscape 顺时针转(右转) 90 度是 Portrait,再顺时针转(右转) 90 度是 LandscapeFlipped
                lblMsg.Text += "CurrentOrientation: " + DisplayInformation.GetForCurrentView().CurrentOrientation.ToString();
    
                // NativeOrientation 或 CurrentOrientation 发生变化时触发的事件(NativeOrientation 一般是不会变的)
                DisplayInformation.GetForCurrentView().OrientationChanged += ScreenOrientation_OrientationChanged;
            }
    
            private void ScreenOrientation_OrientationChanged(DisplayInformation sender, object args)
            {
                lblMsg.Text += Environment.NewLine;
                lblMsg.Text += "NativeOrientation: " + DisplayInformation.GetForCurrentView().NativeOrientation.ToString();
                lblMsg.Text += Environment.NewLine;
                lblMsg.Text += "CurrentOrientation: " + DisplayInformation.GetForCurrentView().CurrentOrientation.ToString();
            }
    
            protected override void OnNavigatedFrom(NavigationEventArgs e)
            {
                DisplayInformation.GetForCurrentView().OrientationChanged -= ScreenOrientation_OrientationChanged;
            }
    
            private void btnLock_Checked(object sender, RoutedEventArgs e)
            {
                /* 在 Package.appxmanifest 中可以配置 app 的允许方向,类似如下(如果不配置就是允许任何方向)
                   <uap:InitialRotationPreference>
                       <uap:Rotation Preference="portrait" />
                       <uap:Rotation Preference="landscape" />
                       <uap:Rotation Preference="portraitFlipped" />
                       <uap:Rotation Preference="landscapeFlipped" />
                   <uap:InitialRotationPreference>
                */
    
                // DisplayInformation.AutoRotationPreferences - 指定当前 app 的首选方向,即强制通过指定的方向显示(必须是在 Package.appxmanifest 配置的允许方向之一)
                DisplayInformation.AutoRotationPreferences = DisplayInformation.GetForCurrentView().CurrentOrientation;
                btnLock.Content = "解除方向锁定";
            }
    
            private void btnLock_Unchecked(object sender, RoutedEventArgs e)
            {
                DisplayInformation.AutoRotationPreferences = DisplayOrientations.None;
                btnLock.Content = "锁定当前方向";
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/ansen312/p/5913546.html
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