MVVM轻导航服务-更改主窗口的标题和大小

本文关键字：窗口 标题 导航 服务 MVVM | 更新日期: 2023-09-27 18:18:34

我正在创建一个新的WPF应用程序(我的第一个WPF应用程序):

  • 。Net 4.0
    • <
  • MVVM光/gh>c#
  • MahApps地铁

我已经在MVVM Light中使用导航服务实现了导航。为了达到同样的目的，我使用了主窗口和页面。

在我的主窗口。我有一个主机正在改变我当前的视图:

<Controls:MetroWindow x:Class="App.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
        xmlns:resx="clr-namespace:MaverickDesktop.Resources"
        Title="My title" 
        Height="280" 
        Width="500">
    <Window.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/Blue.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Accents/BaseLight.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Window.Resources>
    <Frame Source="'Views'LoginView.xaml" NavigationUIVisibility="Hidden" Name="MainFrame"></Frame>
</Controls:MetroWindow>

这是LoginView。xaml页面:

<Page x:Class="App.Views.LoginView"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:Dialog="clr-namespace:MahApps.Metro.Controls.Dialogs;assembly=MahApps.Metro"
      Dialog:DialogParticipation.Register="{Binding}"
      mc:Ignorable="d"
      xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro" 
      xmlns:resx="clr-namespace:MaverickDesktop.Resources"
      Height="500" 
      Width="700"
      xmlns:iconPacks="http://metro.mahapps.com/winfx/xaml/iconpacks"
      DataContext="{Binding Main, Source={StaticResource Locator}}"
      >
    <Grid Margin="0,0,0,10">
        <Label Content="User:" HorizontalAlignment="Left" Margin="24,37,0,0" VerticalAlignment="Top" FontSize="24"/>
        <Label Content="Password:" HorizontalAlignment="Left" Margin="24,96,0,0" VerticalAlignment="Top" FontSize="24"/>
        <TextBox HorizontalAlignment="Left" Height="42" Margin="172,37,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="274" Name="txtUser" FontSize="24" Controls:TextBoxHelper.ClearTextButton="True" Text="{Binding personnel.personnel_key, Mode=TwoWay}"/>
        <PasswordBox HorizontalAlignment="Left" Height="42" Margin="172,96,0,0" VerticalAlignment="Top" Width="274" Name="txtPassword" FontSize="24" Controls:TextBoxHelper.ClearTextButton="True" PasswordChar="*" PasswordChanged="txtPassword_PasswordChanged"/>
        <Button Content="Ingresar" HorizontalAlignment="Left" IsDefault="True" Margin="172,169,0,-22" VerticalAlignment="Top" Width="274" Height="44" FontSize="24" Name="btnLogin" Style="{StaticResource AccentedSquareButtonStyle}" Command="{Binding btn_login_click}"/>
    </Grid>
</Page>

问题:

  • 如何根据当前视图更改窗口的标题和大小?这可能吗?

MVVM轻导航服务-更改主窗口的标题和大小

首先，你必须理解绑定的概念，你的标题等在MainWindow中是硬编码的值。

现在我能找到的最简单的方法是有一个模型，例如

public class ViewPayload{
    public string Title{get;set;}
    //more properties here
}

在你的主窗口上，你想要改变的属性

public class MainWindow : MetroWindow{
public string Title{get;set;}
// more properties here
}

现在有趣的是，你可以创建一个pub子事件，像这样

private readonly IEventAggregator _eventAggregator = new EventAggregator();
_eventAggregator.GetEvent<ViewPayload>().Subscribe(ChangePropertiesFromModel);

然后当你想要发布的时候，只要做，

_eventAggregator.GetEvent<ViewPayload>().Publish(PublisPayloadMethod());
并将窗口内容更改为binding，因此

Title="{binding TitleProperty}"
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