如何防止一次单击功能在两次单击功能内被调用? [英] How to prevent one click function to be called within two click function?

问题描述

我正在尝试向按钮添加自定义行为.如果单击一次-将执行一项操作.如果单击两次，则执行另一个.

I am trying to add custom behaviour to my buttons. If clicked once - one action is performed. If clicked twice another one is performed.

我在此答案中看到了这样的解决方案，我尝试了所有可能的组合:

I saw such a solution in this answer and I have tried all possible combinations:

        clickOnce.shouldBeRequiredToFailByGestureRecognizer(clickTwice)
        clickTwice.shouldBeRequiredToFailByGestureRecognizer(clickOnce)
        clickOnce.shouldRequireFailureOfGestureRecognizer(clickTwice)
        clickTwice.shouldRequireFailureOfGestureRecognizer(clickOnce)
        clickOnce.canPreventGestureRecognizer(clickTwice)
        clickOnce.canBePreventedByGestureRecognizer(clickTwice)
        clickTwice.canPreventGestureRecognizer(clickOnce)
        clickTwice.canBePreventedByGestureRecognizer(clickOnce)

但是对我没有任何帮助.

But nothing worked for me.

这是完整的代码:

import Cocoa

class ViewController: NSViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.

        let buttonTestOne = NSButton(frame: CGRect(x: 500, y: 500, width: 100, height: 500))

        let clickOnceForTestOne = NSClickGestureRecognizer(target: buttonTestOne, action: #selector(ViewController.clickOneTime(_:)))
        clickOnceForTestOne.numberOfClicksRequired = 1
        buttonTestOne.addGestureRecognizer(clickOnceForTestOne)
        self.view.addSubview(buttonTestOne)

        let arrTestButtons = ["One", "Two", "Three"]

        var x = 0
        var y = 0

        for item in arrTestButtons{
            let buttonNew = NSButton(frame: CGRect(x: x, y: y, width: 100, height: 100))
            x = x + 120
            y = y + 120
            buttonNew.attributedTitle = NSAttributedString(string: item)
            let clickOnce = NSClickGestureRecognizer(target: self, action: #selector(ViewController.clickOneTime(_:)))
            clickOnce.numberOfClicksRequired = 1
            buttonNew.addGestureRecognizer(clickOnce)
            let clickTwice = NSClickGestureRecognizer(target: self, action: #selector(ViewController.clickTwoTimes(_:)))
            clickTwice.numberOfClicksRequired = 2
            buttonNew.addGestureRecognizer(clickTwice)
            clickOnce.shouldBeRequiredToFailByGestureRecognizer(clickTwice)
            clickTwice.shouldBeRequiredToFailByGestureRecognizer(clickOnce)
            clickOnce.shouldRequireFailureOfGestureRecognizer(clickTwice)
            clickTwice.shouldRequireFailureOfGestureRecognizer(clickOnce)
            clickOnce.canPreventGestureRecognizer(clickTwice)
            clickOnce.canBePreventedByGestureRecognizer(clickTwice)
            clickTwice.canPreventGestureRecognizer(clickOnce)
            clickTwice.canBePreventedByGestureRecognizer(clickOnce)

            self.view.addSubview(buttonNew)
        }


    }

    func clickOneTime(g:NSClickGestureRecognizer){
        if g.state == .Ended {
            Swift.print("single click")
        }
    }
    func clickTwoTimes(g: NSClickGestureRecognizer){
        if g.state == .Ended {
            Swift.print("DOUBLE CLICK!")
        }
    }
    override var representedObject: AnyObject? {
        didSet {
        // Update the view, if already loaded.
        }
    }


}

我做错了什么?我认为错误一定很简单，我要么是从错误的地方打电话，要么是那样的话，但我听不懂.

What am I doing wrong? I think the mistake must be pretty simple, I am either calling from the wrong place, or somewhat like that, but I can't understand.

这是日志文件，所有组合都相同:

Here is the log file, which is the same for all combinations:

点击一次:

single click

符合预期

单击两次:

single click
DOUBLE CLICK!

同时单击和双击.

我已经阅读了文档.我已经尝试了所有组合，因为找不到解决方案.

I have read the documentation. And I've tried all the combinations, because couldn't find a solution.

我也尝试过使用日志.所以Swift.print(clickOnce.shouldBeRequiredToFailByGestureRecognizer(clickTwice))和其中之一，但是它给了我false.

I have also tried with the logs. So Swift.print(clickOnce.shouldBeRequiredToFailByGestureRecognizer(clickTwice)) and one of these, but it gives me false.

推荐答案

我试图自己解决这个问题；事实证明，该解决方案相对简单.

I was trying to solve this myself; it turns out that the solution is relatively straightforward.

使用手势识别器进行双击(在这里，我已经将它们添加到视图中，但是相同的原理也适用于按钮)

Use a gesture recogniser for the double-click (here, I've added them to the view, but the same principle should work for buttons)

let doubleClickRecognizer = NSClickGestureRecognizer(target: self, action: #selector(ViewController.clickTwice))
doubleClickRecognizer.numberOfClicksRequired = 2
self.view?.addGestureRecognizer(doubleClickRecognizer)

添加

@objc func clickTwice() {
    print("double click")
}

然后处理

override func mouseDown(with event: NSEvent) {
    print("mouse down; once")
}

(或适当的等效值).

(or appropriate equivalent).

NSGestureRecognizer具有

NSGestureRecognizer has

var delaysPrimaryMouseButtonEvents: Bool

(默认情况下设置为true)，因此使用此组合，它会一直等待，直到doubleClickRecognizer处理了双击，然后再上到响应者链，以查看还有谁对鼠标单击感兴趣.

which by default is set to true, so with this combination, it waits until the doubleClickRecognizer has handled the double-click before going up the responder chain to see who else is interested in a mouseclick.

两个手势识别器与在mouseDown中处理单击和双击具有相同的问题:单击首先触发.为了克服这个问题，您需要覆盖

Two gesture recognisers have the same problem as handling single and double clicks in mouseDown: the single click fires first. In order to overcome this, you need to override

func gestureRecognizer(_ gestureRecognizer: NSGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: NSGestureRecognizer) -> Bool  

这不是您调用的函数，而是您覆盖的委托函数.因此，您将viewController设置为符合NSGestureRecognizerDelegate(这意味着它将接收委托方法)；设置singleClickRecognizer.delegate = self(其中self是您的viewController)，并实现

This is not a function you call, it's a delegate function that you override. So you set your viewController to conform to NSGestureRecognizerDelegate (which means it will receive delegate methods); set singleClickRecognizer.delegate = self (where self is your viewController), and implement

func gestureRecognizer(_ gestureRecognizer: NSGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: NSGestureRecognizer) -> Bool {
    if gestureRecognizer == singleClickRecognizer && otherGestureRecognizer == doubleClickRecognizer {
        return true
    }
    return false
    }

指出您的singleClickRecognizer在执行其选择器之前，等待doubleClickRecognizer失败.

which states that your singleClickRecognizer waits for the doubleClickRecognizer to fail before executing its selector.

不幸的是，我发现在SpriteKit中，虽然这段代码确实做到了(首先处理双击)，但它会导致不可接受的延迟，所以我不确定我是否可以推荐它.

Unfortunately, I have found that in SpriteKit, while this code does what it says on the tin (process a double-click first), it leads to unacceptable delays, so I'm not sure I can recommend it.

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