Question

我正试图通过PanResponder处理React Native中的长按。在一次体面的搜索后，我无法找到如何以正确的方式做到这一点，所以我在这里问。这个想法是在检测到屏幕上的长按（点击）时执行代码。我达到了这样的目的：

public class ScriptCreator {

    public static void main(String[] args) throws IOException {
        #Choose the CSV file that I am importing the data from
        String fName = "C:\\Users\\MyUser\\Downloads\\CurrentApplications (1).csv";
        String thisLine;
        int count = 0;
        FileInputStream fis = new FileInputStream(fName);
        DataInputStream myInput = new DataInputStream(fis);
        int i = 0;
        #Prints the List of names in the CSV file
        while((thisLine = myInput.readLine()) != null){
            String strar[] = thisLine.split(",");
            Printer(strar[0]);
        }

    }

    public static void Printer(String arg) throws IOException{      
        #Want to pull from the String strar[0] from above
        #Says that it cannot be resolved to a variable      
            String name = arg;
            String direc = "C:/Users/MyUser/Documents/";
            String path = "C:/Users/MyUser/Documents";
            Iterable<String> lines = Arrays.asList("LOGIN -acceptssl ServerName","N " + name + " " + direc ,"cd " + name,"import " + path  + "*.ppf" + " true","scan", "publishassessase -aseapplication " + name,"removeassess *","del " + name );
            Path file = Paths.get(name + ".txt");
            Files.write(file, lines, Charset.forName("UTF-8"));

    }

}

这是处理长按的正确方法还是有更好的方法？

Answer 1

我最终使用setTimeout执行此功能。这是一个代码，它具有检测屏幕的哪个部分被长按（左或右）的功能：

handlePanResponderGrant(e, gestureState) {
    console.log('Start of touch');

    this.long_press_timeout = setTimeout(function(){
            if (gestureState.x0 <= width/2 )
            {
                AlertIOS.alert(
                  'Left',
                  'Long click on the left side detected',
                  [
                    {text: 'Tru dat'}
                  ]
                );
            }
            else {
                AlertIOS.alert(
                  'Right',
                  'So you clicked on the right side?',
                  [
                    {text: 'Indeed'}
                  ]
                );
            }
        }, 
        LONG_PRESS_MIN_DURATION);
}
handlePanResponderMove(e, gestureState) {
    clearTimeout(this.long_press_timeout);
}
handlePanResponderRelease(e, gestureState){
    clearTimeout(this.long_press_timeout);
    console.log('Touch released');
}
handlePanResponderEnd(e, gestureState) {
    clearTimeout(this.long_press_timeout);
    console.log('Finger pulled up from the image');
}

Answer 2

我在ScrollView中有Carousel，我想知道用户在def stringPipeline(string1: String) = (string2: String) => { string1.foldLeft(string2)((s: String, c: Char) => c match { case 'u' => s.toUpperCase case 'r' => s.reverse case _ => s } ) }的项目上按下了什么。感谢@Alexander Netsov，我最终做到了这一点。

Carousel

垂直this._panResponder = PanResponder.create({ onStartShouldSetPanResponder: () => true, onMoveShouldSetPanResponder: () => false, onPanResponderGrant: (e, gestureState) => { this.onLongPressTimeout = setTimeout(() => { console.log("ON LONG PRESS", gestureState); }, LONG_PRESS_DELAY); }, onPanResponderRelease: () => { clearTimeout(this.onLongPressTimeout); }, onPanResponderTerminate: () => { clearTimeout(this.onLongPressTimeout); }, onShouldBlockNativeResponder: () => false, onPanResponderTerminationRequest: () => true });，横向ScrollView和Carousel，在Android上都运行良好。

注意：它未在iOS上测试

如何处理PanResponder长按事件？

2 个答案: