我们简单实现一个通过点击菜单切换显示页面的功能,实现效果:
xaml:
<UserControl x:Class="MyWpf.MyNavigation" 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:local="clr-namespace:MyWpf" mc:Ignorable="d" d:DesignHeight="450" d:DesignWidth="800"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="200"></ColumnDefinition> <ColumnDefinition ></ColumnDefinition> </Grid.ColumnDefinitions> <ItemsControl ItemsSource="{Binding Modules}"> <!--作为数据展示,总要有个容器吧,这个panel就是为了设置容器用的,设置为StackPanel,WrapPanel都可以 --> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <StackPanel> </StackPanel> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> <!--每一个数据条目应该是个什么样子,负责具体呈现的--> <ItemsControl.ItemTemplate> <DataTemplate> <!--里面填充按钮控件 点击按钮执行command命令,并带Name参数;如果使用被注释掉的这个<Button>按钮标签的写法的话,后台在写OpenPage命令的时候
就得写在模型Modules中,和Name属性同一级,就是写在Navigation类中,因为这个标签是在ItemTemplate每一条数据模板中,
所以就要为每一个按钮都对应一个命令方法,下面那种写法就是可以避免这种情况,避免了每生成一个对象都要生成一个对应的command命令,--> <!--<Button Command="{Binding OpenPage}" CommandParameter="{Binding Name}"
Content="{Binding Name}" Height="30" Margin="5"> </Button>--> <!--AncestorType:上级节点的类型 Path:绑定源的路径--> <Button Command="{Binding RelativeSource={RelativeSource AncestorType=local:MyNavigation},Path=DataContext.OpenPage}"
CommandParameter="{Binding Name}" Content="{Binding Name}" Height="30" Margin="5"></Button> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> <ContentControl Content="{Binding Page}" Grid.Column="1"> </ContentControl> </Grid> </UserControl>
后台:
using GalaSoft.MvvmLight; using GalaSoft.MvvmLight.Command; using MyWpf.NavigationView; using System.Collections.Generic; using System.Windows.Controls; namespace MyWpf { /// <summary> /// MyNavigation.xaml 的交互逻辑 /// </summary> public partial class MyNavigation : UserControl { public MyNavigation() { InitializeComponent(); this.DataContext = new MainMoudle(); } } public class MainMoudle : ViewModelBase { public MainMoudle() { Modules = new List<Navigation>() { new Navigation() { Name = "菜单一" },
new Navigation() { Name = "菜单二" }, new Navigation() { Name = "菜单三" } }; OpenPage = new RelayCommand<string>(t => open(t)); } public List<Navigation> Modules { get; set; } private object _page; /// <summary> /// 打开的页面 只能读,不能改 /// </summary> public object Page { get { return _page; } set { _page = value; RaisePropertyChanged(); } } private void open(string name) { switch (name) { case "菜单一": Page = new Page1(); break; case "菜单二": Page = new Page2(); break; case "菜单三": Page = new Page3(); break; } } /// <summary> /// 创建点击按钮的command命令 /// </summary> public RelayCommand<string> OpenPage { get; set; } } public class Navigation { public string Name { get; set; } } }
Page1:
<UserControl x:Class="MyWpf.NavigationView.Page1" 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:local="clr-namespace:MyWpf.NavigationView" mc:Ignorable="d" d:DesignHeight="450" d:DesignWidth="800"> <Grid> <TextBlock Width="300" Height="300" FontSize="100">菜单1</TextBlock> </Grid> </UserControl>
Page2:
<UserControl x:Class="MyWpf.NavigationView.Page2" 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:local="clr-namespace:MyWpf.NavigationView" mc:Ignorable="d" d:DesignHeight="450" d:DesignWidth="800"> <Grid> <TextBlock Width="300" Height="300" FontSize="100">菜单2</TextBlock> </Grid> </UserControl>
Page3:
<UserControl x:Class="MyWpf.NavigationView.Page3" 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:local="clr-namespace:MyWpf.NavigationView" mc:Ignorable="d" d:DesignHeight="450" d:DesignWidth="800"> <Grid> <TextBlock Width="300" Height="300" FontSize="100">菜单3</TextBlock> </Grid> </UserControl>
1