Question

我想知道处理我遇到的问题的最佳方法。我正处于开发WPF应用程序的早期阶段，该应用程序具有多个图像个别班级。我正在尝试使用MVVM模型，但我希望实现一个鼠标悬停事件，这样当我滚动图像时我希望提供一些信息或对图像做一些效果我不太确定如何绕过这个但是我有一个下面这个类的例子。

public class TeamKit
{
    private Image mainImage;
    public Canvas Position { get; set; }
    public TextBlock PlayerText { get; set; }
    public TextBlock NameText{ get; set; }
    public Player Player { get; set; }
    private string _playerName = "Player0";
    private string _playerNumber = "0";
    private BitmapImage _bImage;

    public TeamKit(Thickness t)
    {
        mainImage = new Image();
        _bImage = new BitmapImage(new Uri("pack://Application:,,,/Resources/KitC.png"));
        mainImage.Source = _bImage;
        mainImage.Stretch = System.Windows.Media.Stretch.None;
        Position = new Canvas();
        Position.Width = 38;
        Position.Height = 45;
        Position.Margin = t;
        mainImage.Margin = new Thickness(0, 0, 0, 6);

        PlayerText = new TextBlock();
        PlayerText.Text = ""; PlayerText.TextAlignment = TextAlignment.Center;
        PlayerText.Margin = new Thickness(11, 15, 27, 15);

        Position.Children.Add(mainImage);
        Position.Children.Add(PlayerText);
    }

    public TeamKit()
    {
        mainImage = new Image();
        _bImage = new BitmapImage(new Uri("pack://Application:,,,/Resources/KitC.png"));
        mainImage.Source = _bImage;
        mainImage.Stretch = System.Windows.Media.Stretch.None;
        Position = new Canvas();
        Position.Width = 38;
        Position.Height = 45;
        //mainImage.Margin = new Thickness(0, 0, 0, 6);

        PlayerText = new TextBlock();
        PlayerText.Text = _playerNumber; PlayerText.TextAlignment = TextAlignment.Center;
        PlayerText.Margin = new Thickness(12, 15, 27, 15);
        PlayerText.Width = 15;

        Viewbox Vb = new Viewbox();
        //Vb.StretchDirection = StretchDirection.Both;
        Vb.Stretch = System.Windows.Media.Stretch.Uniform;
        Vb.VerticalAlignment = VerticalAlignment.Stretch;
        Canvas.SetTop(Vb, 40);
        Canvas.SetLeft(Vb, -11);
        Vb.MaxWidth = 50;

        NameText = new TextBlock();
        NameText.Text = _playerName;
        NameText.TextAlignment = TextAlignment.Center;
        NameText.MaxHeight = 40;
        NameText.MaxWidth = 90;

        Vb.Child = NameText;
        Position.Children.Add(Vb);
         //<TextBlock Text="FooAlanghi" TextWrapping="Wrap" TextAlignment="Center" MaxHeight="40" MaxWidth="92" />


        Position.Children.Add(mainImage);
        Position.Children.Add(PlayerText);
    }

    public TeamKit(Player Player, int PlayerNumber)
    {
        this.Player = Player;
        _playerNumber = PlayerNumber.ToString();
        _playerName = Player.Last_Name;

        mainImage = new Image();
        _bImage = new BitmapImage(new Uri("pack://Application:,,,/Resources/KitC.png"));
        mainImage.Source = _bImage;
        mainImage.Stretch = System.Windows.Media.Stretch.None;
        Position = new Canvas();
        Position.Width = 38;
        Position.Height = 45;
        //mainImage.Margin = new Thickness(0, 0, 0, 6);

        PlayerText = new TextBlock();
        PlayerText.Text = _playerNumber; PlayerText.TextAlignment = TextAlignment.Center;
        PlayerText.Margin = new Thickness(12, 15, 27, 15);
        PlayerText.Width = 15;

        Viewbox Vb = new Viewbox();
        //Vb.StretchDirection = StretchDirection.Both;
        Vb.Stretch = System.Windows.Media.Stretch.Uniform;
        Vb.VerticalAlignment = VerticalAlignment.Stretch;
        Canvas.SetTop(Vb, 40);
        Canvas.SetLeft(Vb, -11);
        Vb.MaxWidth = 50;

        NameText = new TextBlock();
        NameText.Text = _playerName;
        NameText.TextAlignment = TextAlignment.Center;
        NameText.MaxHeight = 40;
        NameText.MaxWidth = 90;

        Vb.Child = NameText;
        Position.Children.Add(Vb);
        //<TextBlock Text="FooAlanghi" TextWrapping="Wrap" TextAlignment="Center" MaxHeight="40" MaxWidth="92" />


        Position.Children.Add(mainImage);
        Position.Children.Add(PlayerText);
    }


    public void Add(Panel Parent)
    {
        Parent.Children.Add(this.Position);
    }

    public static void DrawPositionLineUp(List<TeamKit> Players, Panel panel, double top, double left)
    {
        double ix = 0;
        foreach (TeamKit t in Players)
        {
            Canvas.SetLeft(t.Position, left);
            Canvas.SetTop(t.Position, ix += top);
            t.Add(panel);
        }
    }
}

Answer 1

你使用MVVM路由很好，但要注意你想要做的事与MVVM无关。你的问题是所有与视图相关的（主要是）。

你的控制需要ToolTip：

<Image ...>
    <Image.ToolTip>
        <ToolTip ...>
            Content (which can be another layout of controls)
        </ToolTip>
    </Image.ToolTip>
</Image>

至于效果，取决于什么效果，其中很多已经内置（模糊，阴影等）。但是，无论哪种方式，您都希望在样式中使用触发器。

<Image ...>
    <Image.Style>
        <Style>
            <Trigger Property="Image.IsMouseOver" Value="True">
                <Setter ... /> <!-- Apply Styles Here -->
            </Trigger>
        </Style>
    </Image.Style>
</Image>

注意：最好将样式转换为静态资源，并将其应用于该窗口/用户控件/页面中的所有控件或链中的更高层（应用程序），以便您可以执行此操作。

<Image Style="{StaticResource MouseOverImage}" ... />

至于为什么我说“你的问题是所有视图相关的（好吧，大多数情况下）”......我的意思是它与视图相关，直到数据绑定，然后你必须与你协调视图模型，以确保它公开您需要的属性。除此之外，它是一个100％与视图相关的问题，在这种情况下你不必担心任何MVVM。继续使用MVVM，但要意识到无论你是否使用MVVM，这都是你要做的。

Answer 2

您是否考虑使用触发器？在处理鼠标悬停事件时，我通常使用触发器，但你也应该考虑MVVM light - （或类似的东西）它是MVVM爱好者的一个很棒的工具。

鼠标悬停在MVVM单个对象上的事件

2 个答案: