Demo 演示:
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1. 新建项目
站长开发环境:
- VS 2019 企业版 16.70
- .NET 5 Preview 5
.NET 5 WPF 项目模板和 .NET Core 3.1 WPF 项目模板没有区别,创建好项目后,NuGet 引入 MaterialDesignThemes 库:
2.引入样式
演示 Demo 就一个 xaml 文件和 xaml.cs 文件,为了方便后面收集 WPF 界面设计效果,统一放在了开源项目 TerminalMACS.ManagerForWPF 中,所以控件样式引用直接在 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.控件动画效果
见上面 GIF 动画,登录窗口加载时,用户名输入框、密码输入框、记住密码、右侧背景图片等元素有动画效果,每个部分代码结构类似,比如下面的用户名输入框代码:
<!--#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-->
使用了开源控件 MD 的 TransitioningContent 组件,其中 TransitionEffect 的 Kind 属性设置控件动画方向。
4. 模拟登录
登录按钮布局代码:
<!--#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-->
点击登录时,打开等待对话框(点击时绑定了 materialDesign:DialogHost.OpenDialogCommand),在等待对话框的打开与关闭事件中做登录逻辑处理。
private async Task<bool> ValidateCreds()
{
// 模拟登录
// 你可以发送登录信息到服务器,得到认证回馈
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)
{
// 需要关闭登录对话框并显示主窗口
eventArgs.Session.Close(true);
}
else
{
// 登录失败,设置false作为参数
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();
}
}
等待对话框打开事件中,模拟登录逻辑。
等待对话框关闭事件中,做界面响应信息。
5. 源码下载
上面只贴了部分关键代码,源码已放 Github 中。