Demo演示：

你的時(shí)間寶貴，不想看啰嗦的文字，可直接拉到文末下載源碼！

1. 新建項(xiàng)目

站長(zhǎng)開(kāi)發(fā)環(huán)境：

• VS 2019企業(yè)版 16.70
• .NET 5 Preview 5

.NET 5 WPF 項(xiàng)目模板和 .NET Core 3.1 WPF 項(xiàng)目模板沒(méi)有區(qū)別，創(chuàng)建好項(xiàng)目后，NuGet 引入 MaterialDesignThemes 庫(kù)：

2.引入樣式

演示Demo就一個(gè)xaml文件和xaml.cs文件，為了方便后面收集WPF界面設(shè)計(jì)效果，統(tǒng)一放在了開(kāi)源項(xiàng)目TerminalMACS.ManagerForWPF[1]中，所以控件樣式引用直接在FoodAppLoginView.xaml中添加：

<Window.Resources><ResourceDictionary><ResourceDictionary.MergedDictionaries><ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" /><ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" /><ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.Amber.xaml" /><ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Lime.xaml" /></ResourceDictionary.MergedDictionaries></ResourceDictionary> </Window.Resources>

3.控件動(dòng)畫(huà)效果

見(jiàn)上面GIF動(dòng)畫(huà)，登錄窗口加載時(shí)，用戶名輸入框、密碼輸入框、記住密碼、右側(cè)背景圖片等元素有動(dòng)畫(huà)效果，每個(gè)部分代碼結(jié)構(gòu)類(lèi)似，比如下面的用戶名輸入框代碼：

<!--#region User name textblox--> <materialDesign:TransitioningContent Grid.Row="2" Margin="90,20,00,0" HorizontalAlignment="Left"><materialDesign:TransitioningContent.OpeningEffects><materialDesign:TransitionEffect Kind="SlideInFromLeft" Duration="0:0:2"/></materialDesign:TransitioningContent.OpeningEffects><StackPanel Style="{StaticResource setVisibilityBasedLogin}" Orientation="Horizontal"><materialDesign:PackIcon Kind="Account" Width="16" Height="16" VerticalAlignment="Center"Margin="0,5,10,0" Foreground="{Binding ElementName=NameTextBox, Path=BorderBrush}"/><TextBox x:Name="NameTextBox" Width="140" materialDesign:HintAssist.Hint="{markup:I18n {x:Static i18NResources:Language.FoodAppLoginView_UserName}}"Style="{StaticResource MaterialDesignFloatingHintTextBox}"/></StackPanel> </materialDesign:TransitioningContent> <!--#endregion-->

使用了開(kāi)源控件MD的TransitioningContent組件，其中TransitionEffect的Kind屬性設(shè)置控件動(dòng)畫(huà)方向。

4. 模擬登錄

登錄按鈕布局代碼：

<!--#region control panel--> <materialDesign:TransitioningContent Grid.Row="4" Margin="40,20,0,0"><materialDesign:TransitioningContent.OpeningEffects><materialDesign:TransitionEffect Kind="SlideInFromBottom" Duration="0:0:2"/></materialDesign:TransitioningContent.OpeningEffects><StackPanel Style="{StaticResource setVisibilityBasedLogin}" Orientation="Horizontal" HorizontalAlignment="Center"><CheckBox Content="{markup:I18n {x:Static i18NResources:Language.FoodAppLoginView_RememberMe}}"/><Button Style="{StaticResource MaterialDesignRaisedButton}"Command="{x:Static materialDesign:DialogHost.OpenDialogCommand}"materialDesign:ButtonAssist.CornerRadius="20"Width="80" Height="40" Margin="120,0,0,0"Content="{markup:I18n {x:Static i18NResources:Language.FoodAppLoginView_Login}}"/></StackPanel> </materialDesign:TransitioningContent> <!--#endregion-->

點(diǎn)擊登錄時(shí)，打開(kāi)等待對(duì)話框（點(diǎn)擊時(shí)綁定了materialDesign:DialogHost.OpenDialogCommand），在等待對(duì)話框的打開(kāi)與關(guān)閉事件中做登錄邏輯處理。

private async Task<bool> ValidateCreds() {// 模擬登錄// 你可以發(fā)送登錄信息到服務(wù)器，得到認(rèn)證回饋await Task.Delay(TimeSpan.FromSeconds(2));Random gen = new Random(DateTime.Now.Millisecond);int loginProb = gen.Next(100);return loginProb <= 20; }private async void OpenCB_DialogOpened(object sender, MaterialDesignThemes.Wpf.DialogOpenedEventArgs eventArgs) {try{this.IsJustStarted = true;this.LoginStatusmsg = "";bool isLoggedIn = await ValidateCreds();if (isLoggedIn){// 需要關(guān)閉登錄對(duì)話框并顯示主窗口eventArgs.Session.Close(true);}else{// 登錄失敗，設(shè)置false作為參數(shù)eventArgs.Session.Close(false);}}catch (Exception){//throw;} }private void ClosingCB_DialogClosing(object sender, MaterialDesignThemes.Wpf.DialogClosingEventArgs eventArgs) {if (eventArgs.Parameter == null){return;}IsLoggedIn = (bool)eventArgs.Parameter;IsJustStarted = false;if(IsLoggedIn){this.LoginStatusmsg = I18nManager.Instance.Get(I18nResources.Language.FoodAppLoginView_Success).ToString();}else{this.LoginStatusmsg = I18nManager.Instance.Get(I18nResources.Language.FoodAppLoginView_Fail).ToString();} }

等待對(duì)話框打開(kāi)事件中，模擬登錄邏輯。

等待對(duì)話框關(guān)閉事件中，做界面響應(yīng)信息。

5. 源碼下載

上面只貼了部分關(guān)鍵代碼，源碼已放Github中。

參考視頻：WPF Food App Login UI Material Design [Speed Design][2]

Demo源碼：FoodAppLoginUI[3]

[1]TerminalMACS.ManagerForWPF: https://github.com/dotnet9/TerminalMACS.ManagerForWPF

[2]WPF Food App Login UI Material Design [Speed Design]: https://www.youtube.com/watch?v=1i5oWNvIYmo

[3]FoodAppLoginUI: https://github.com/dotnet9/TerminalMACS.ManagerForWPF/tree/master/src/TerminalMACS.TestDemo/Views/FoodAppLoginUI

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