c# - 在 Xamarin Mac 中阻止鼠标气泡

Question

我创建了一个自定义 NSView，我想将其放置在窗口内容的顶部，以在加载所有内容时阻止任何交互。我遇到的问题是我可以通过 NSView 单击到下面的控件，尽管现在已经修复了。新问题是，即使我无法单击控件，当我将鼠标移到文本控件上时，鼠标也会切换到 I Beam 图标。

如何让 NSView 完全阻止与其下方所有内容的所有交互？

我创建的 NSView 如下:

[Register("StupidView")]
public class StupidView : NSView
{


    public StupidView()
    {
        // Init
        Initialize();
    }

    public StupidView(IntPtr handle) : base (handle)
    {
        // Init
        Initialize();
    }

    [Export("initWithFrame:")]
    public StupidView(CGRect frameRect) : base(frameRect) {
        // Init
        Initialize();
    }

    private void Initialize()
    {
        this.AcceptsTouchEvents = true;
        this.WantsLayer = true;
        this.LayerContentsRedrawPolicy = NSViewLayerContentsRedrawPolicy.OnSetNeedsDisplay;
    }

    public override void DrawRect(CGRect dirtyRect)
    {
        var ctx = NSGraphicsContext.CurrentContext.GraphicsPort;
        ctx.SetFillColor(new CGColor(128, 128, 128, 0.7f));
        ctx.FillRect(dirtyRect);
    }

    public override void MouseDown(NSEvent theEvent)
    {
        if (Hidden)
        {
            base.MouseDown(theEvent);
        }
    }

    public override void MouseDragged(NSEvent theEvent)
    {

        if (Hidden)
        {
            base.MouseDragged(theEvent);
        }
    }

    public override bool AcceptsFirstResponder()
    {
        return !this.Hidden;
    }

    public override bool AcceptsFirstMouse(NSEvent theEvent)
    {
        return !this.Hidden;
    }

    public override NSView HitTest(CGPoint aPoint)
    {
        return Hidden ? null : this;
    }
}

Answer 1

几周前我遇到了同样的问题，下面是我如何解决这个问题:

首先，为了防止用户在下面放置的 super View 上进行交互，我添加了一个透明按钮，该按钮仅用于捕捉鼠标点击，如果您不需要做任何事情，则什么都不做:

 private void Initialize()
 {
    this.AcceptsTouchEvents = true;
    this.WantsLayer = true;
    this.LayerContentsRedrawPolicy = NSViewLayerContentsRedrawPolicy.OnSetNeedsDisplay;

    //Add button to prevent user interactions 

    NSButton buttonToPreventUserInteraction = new NSButton();
    buttonToPreventUserInteraction.Bordered = false;
    buttonToPreventUserInteraction.Transparent = true;
    buttonToPreventUserInteraction.TranslatesAutoresizingMaskIntoConstraints = false;
    AddSubview(buttonToPreventUserInteraction);

    //If you want to add some constraints on the button, for it to resize and keep the same size of your subview

    var dicoViews = new NSMutableDictionary();
    dicoViews.Add((NSString)"buttonToPreventUserInteraction", buttonToPreventUserInteraction);
    NSLayoutConstraint[] buttonToPreventUserInteractionHorizontalConstraints = NSLayoutConstraint.FromVisualFormat("H:|[buttonToPreventUserInteraction]|", NSLayoutFormatOptions.DirectionLeadingToTrailing, null, dicoViews);
    NSLayoutConstraint[] buttonToPreventUserInteractionVerticalConstraints = NSLayoutConstraint.FromVisualFormat("V:|[buttonToPreventUserInteraction]|", NSLayoutFormatOptions.DirectionLeadingToTrailing, null, dicoViews);
    AddConstraints(buttonToPreventUserInteractionHorizontalConstraints);
    AddConstraints(buttonToPreventUserInteractionVerticalConstraints);

 }

对于您的其他问题，即鼠标光标从放置在下方的 super View 中的内容发生变化，您可以在 subview 上添加一个 NSTrackingArea，并实现覆盖方法“MouseMoved”以更改光标。你可以这样做:

首先在您的 subview 上添加 NSTrackingArea(您可以将这段代码放在您的“Initialize”方法中)

NSTrackingAreaOptions opts = ((NSTrackingAreaOptions.MouseMoved | NSTrackingAreaOptions.ActiveInKeyWindow | NSTrackingAreaOptions.InVisibleRect));
var trackingArea = new NSTrackingArea(new CGRect(0, 0, FittingSize.Width, FittingSize.Height), opts, Self, null);

AddTrackingArea(trackingArea);

然后实现覆盖方法:

public override void MouseMoved(NSEvent theEvent)
{
    //You can choose the type of cursor you want to use here
    NSCursor.ArrowCursor.Set();
}

这是为我做的，希望它也适合你