触发事件

我们可以通过 fire() 方法触发事件，这个方法允许我们通过程序触发各种事件，例如： click, mouseover, mousemove 等等，包括自定义事件。

Konva Fire_Events Demoview raw

<!DOCTYPE html>
<html>
  <head>
    <script src="https://unpkg.com/konva@4.0.18/konva.min.js"></script>
    <meta charset="utf-8" />
    <title>Konva Fire Event Demo</title>
    <style>
      body {
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #f0f0f0;
      }
    </style>
  </head>

  <body>
    <div id="container"></div>
    <script>
      var stage = new Konva.Stage({
        container: 'container',
        width: window.innerWidth,
        height: window.innerHeight
      });

      var layer = new Konva.Layer();

      var circle = new Konva.Circle({
        x: stage.width() / 2,
        y: stage.height() / 2 + 10,
        radius: 70,
        fill: 'red',
        stroke: 'black',
        strokeWidth: 4
      });

      var text = new Konva.Text({
        text: '',
        fontFamily: 'Calibri',
        fontSize: 24,
        fill: 'black',
        x: 10,
        y: 10
      });

      circle.on('click', function(evt) {
        text.text('you clicked on the circle!');
        layer.draw();
      });

      layer.add(circle).add(text);
      stage.add(layer);

      // simulate click on circle
      circle.fire('click');
    </script>
  </body>
</html>