新程序员问题:
我正在尝试创建一个类似于您在ipad上看到的简单导航欢迎页面。
我的MainWindow有一个标题栏(不会改变),其余的将是一个根据事件显示不同内容的各种容器。
所以这是我的问题如何绑定容器(contentcontrol)以显示其他视图,即显示welcomeview,然后如果用户单击欢迎视图中的按钮,内容控件将显示他们选择的视图。
我目前的欢迎页面为:
<UserControl x:Class="ContentControl.Views.WelcomeView"
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:vm="clr-namespace:ContentControl.ViewModels"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<UserControl.DataContext>
<vm:WelcomeViewModel />
</UserControl.DataContext>
<Grid Background="red">
<Grid.RowDefinitions >
<RowDefinition Height="25*" />
<RowDefinition Height="50*"/>
<RowDefinition Height="25*"/>
</Grid.RowDefinitions>
<Rectangle Grid.Row="0" Fill="Green"/>
<DockPanel Grid.Row="1" HorizontalAlignment="Center" Background="White">
<Button Height="50" Width="50" Margin="5" Content="DASH" Command="{Binding ViewChangedCommand}" CommandParameter="Dashboard"/>
<Button Height="50" Width="50" Margin="5" Content="ROOM" Command="{Binding ViewChangedCommand}" CommandParameter="MeetingRoom"/>
<Button Height="50" Width="50" Margin="5" Content="SCREEN" Command="{Binding ViewChangedCommand}" CommandParameter="Screen" />
</DockPanel>
<Rectangle Grid.Row="2" Fill="Blue"/>
</Grid>
</UserControl>
viewModel如下:
class WelcomeViewModel : BaseViewModel
{
private MainWindowViewModel _mainWindowVm;
private RelayCommand<string> _viewChangedCommand;
public ICommand ViewChangedCommand
{
get { return _viewChangedCommand ?? (_viewChangedCommand = new RelayCommand<string>(OnViewChanged)); }
}
public event EventHandler ViewChanged;
private void OnViewChanged(string view)
{
EventHandler handler = ViewChanged;
if (handler != null) handler(view, EventArgs.Empty);
}
public MainWindowViewModel MainWindowVm
{
get { return _mainWindowVm; }
set
{
_mainWindowVm = value;
OnPropertyChanged("MainViewModel");
}
}
public WelcomeViewModel()
{
MainWindowVm = new MainWindowViewModel();
ViewChanged += MainWindowVm.ViewChanged;
}
}
}
我的Mainwindow如下:
<Window x:Class="ContentControl.Views.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vm="clr-namespace:ContentControl.ViewModels"
xmlns:views="clr-namespace:ContentControl.Views"
Title="MainWindow" Height="350" Width="525">
<Window.DataContext>
<vm:MainWindowViewModel />
</Window.DataContext>
<Window.Resources>
<DataTemplate DataType="{x:Type vm:ScreenViewModel}">
<views:ScreenView />
</DataTemplate>
<DataTemplate DataType="{x:Type vm:WelcomeViewModel}">
<views:WelcomeView />
</DataTemplate>
<DataTemplate DataType="{x:Type vm:MeetingRoomViewModel}">
<views:MeetingRoomView />
</DataTemplate>
<DataTemplate DataType="{x:Type vm:DashboardViewModel}">
<views:DashboardView />
</DataTemplate>
</Window.Resources>
<Grid>
<StackPanel>
<Label>This Is My Label</Label>
<ContentControl x:Name="MainPanel" Content="{Binding Content, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"
MinHeight="200"
MinWidth="200"
HorizontalContentAlignment="Left"
VerticalContentAlignment="Center"
Focusable="False">
</ContentControl>
</StackPanel>
</Grid>
</Window>
主窗口视图模型:
class MainWindowViewModel : BaseViewModel
{
private UserControl _content;
public UserControl Content
{
get { return _content; }
set
{
_content = value;
OnPropertyChanged("Content");
}
}
public void ViewChanged(object o, EventArgs e)
{
switch (o.ToString())
{
case "Welcome":
{
var welcome = new WelcomeView();
Content = welcome;
break;
}
case "MeetingRoom":
{
var meetingRoom = new MeetingRoomView();
Content= meetingRoom;
break;
}
case "Dashboard":
{
var dashboard = new DashboardView();
Content = dashboard;
break;
}
case "Screen":
{
var screen = new ScreenView();
Content = screen;
break;
}
}
MessageBox.Show(o.ToString());
}
public MainWindowViewModel()
{
}
}
}
如何将这些连接起来互相协作所以我可以将WelcomeView显示为contentcontrol的内容,然后当我按下按钮时,ContentControl会更改为所选内容。
再次抱歉,我是MVVM和WPF的新手,这些绑定让我头疼。
答案 0 :(得分:1)
Buttons DASH,ROOM,SCREEN应位于MainWindow上。 ViewChangedCommand应位于MainWindowViewModel上。内容将通过动态模板显示。
如果你想要控件上的按钮: 好的,那么让我们把按钮放在控件上,但是更改内容命令应该在MainWindowViewModel中。要制作这样的绑定,你应该这样做:
Command="{Binding Path=DataContext.ChangeContentCommand, RelativeSource={RelativeSource AncestorType={x:Type Window}}}"
按钮中的