2

实际上,我将在设计时从资源中获取的图像设置为xaml文件,如下所示:

<Button Click="btnLogin_Click" Name="btnLogin">
    <StackPanel Orientation="Horizontal">
        <Rectangle Width="20" Height="20" Name="recLogin">
            <Rectangle.Resources>
                <SolidColorBrush x:Key="BlackBrush" Color="White" />
            </Rectangle.Resources>
            <Rectangle.Fill>
                <VisualBrush Stretch="Fill" Visual="{StaticResource appbar_user}" x:Name="brushLogin" />
            </Rectangle.Fill>
        </Rectangle>
        <TextBlock Text=" login" Name="txbLogin" />
    </StackPanel>
</Button>

并且工作正常。但是(是一个登录按钮)我希望当用户登录时,按钮上的图像(在一个矩形内)会改变..

我能怎么做?

4

1 回答 1

3

当模型中的属性更新时,您可以使用 aDataTrigger更改图像。

在这个例子中,布尔值IsLoggedIn发生了变化,这反过来又改变了图像。

例子:

xml:

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="125.078" Width="236.441" Name="UI" >
    <Window.Resources>

        <VisualBrush x:Key="Loggedin">
            <VisualBrush.Visual>
                <Image Source="http://icons.iconarchive.com/icons/deleket/sleek-xp-basic/32/Ok-icon.png" Stretch="Uniform" />
            </VisualBrush.Visual>
        </VisualBrush>

        <VisualBrush x:Key="NotLoggedin">
            <VisualBrush.Visual>
                <Image Source="http://icons.iconarchive.com/icons/deleket/sleek-xp-basic/32/Close-2-icon.png" Stretch="Uniform" />
            </VisualBrush.Visual>
        </VisualBrush>

    </Window.Resources>

    <Grid DataContext="{Binding ElementName=UI}">
        <Button Click="btnLogin_Click" Name="btnLogin" HorizontalAlignment="Left" Width="94" Height="40" VerticalAlignment="Top" Margin="63,26,0,0">
            <StackPanel Orientation="Horizontal">
                <Rectangle Width="20" Height="20" Name="recLogin">
                    <Rectangle.Resources>
                        <SolidColorBrush x:Key="BlackBrush" Color="White" />
                    </Rectangle.Resources>
                    <Rectangle.Style>
                        <Style TargetType="{x:Type Rectangle}">
                            <Setter Property="Fill" Value="{StaticResource NotLoggedin}" />
                            <Style.Triggers>
                                <DataTrigger Binding="{Binding IsLoggedIn}" Value="True">
                                    <Setter Property="Fill" Value="{StaticResource Loggedin}" />
                                </DataTrigger>
                            </Style.Triggers>
                        </Style>
                    </Rectangle.Style>
                </Rectangle>
                <TextBlock Text=" login" Name="txbLogin" />
            </StackPanel>
        </Button>
    </Grid>
</Window>

代码:

public partial class MainWindow : Window, INotifyPropertyChanged
{
    private bool _isLoggedIn;

    public MainWindow()
    {
        InitializeComponent();  
    }

    public bool IsLoggedIn
    {
        get { return _isLoggedIn; }
        set { _isLoggedIn = value; NotifyPropertyChanged("IsLoggedIn"); }
    }

    private void btnLogin_Click(object sender, RoutedEventArgs e)
    {
        IsLoggedIn = !IsLoggedIn;
    }

    public event PropertyChangedEventHandler PropertyChanged;
    private void NotifyPropertyChanged(string property)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(property));
        }
    }
 }

注意:我只是使用在线图像,因为我没有您的资源,您可以根据自己的需要进行更改

结果:

IsLoggedIn = 假; 在此处输入图像描述 IsLoggedIn = true; 在此处输入图像描述

于 2013-02-11T21:24:27.327 回答