事件

获取Konva最新的信息

我们可以用 on() 给节点绑定事件。on() 方法需要传入两个参数：事件类型、事件发生时执行的函数。

Konva 支持的事件类型有 mouseover, mouseout, mouseenter, mouseleave, mousemove, mousedown, mouseup, wheel, click, dblclick, dragstart, dragmove,dragend。

说明：尝试鼠标滑过下面的三角形和圆形看看。

Konva Binding_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 Shape Events Demo</title>
    <style>
      body {
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #f0f0f0;
      }
    </style>
  </head>

  <body>
    <div id="container"></div>
    <script>
      function writeMessage(message) {
        text.text(message);
        layer.draw();
      }

      var stage = new Konva.Stage({
        container: 'container',
        width: window.innerWidth,
        height: window.innerHeight
      });

      var layer = new Konva.Layer();

      var triangle = new Konva.RegularPolygon({
        x: 80,
        y: 120,
        sides: 3,
        radius: 80,
        fill: '#00D2FF',
        stroke: 'black',
        strokeWidth: 4
      });

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

      triangle.on('mouseout', function() {
        writeMessage('Mouseout triangle');
      });

      triangle.on('mousemove', function() {
        var mousePos = stage.getPointerPosition();
        var x = mousePos.x - 190;
        var y = mousePos.y - 40;
        writeMessage('x: ' + x + ', y: ' + y);
      });

      var circle = new Konva.Circle({
        x: 230,
        y: 100,
        radius: 60,
        fill: 'red',
        stroke: 'black',
        strokeWidth: 4
      });

      circle.on('mouseover', function() {
        writeMessage('Mouseover circle');
      });
      circle.on('mouseout', function() {
        writeMessage('Mouseout circle');
      });
      circle.on('mousedown', function() {
        writeMessage('Mousedown circle');
      });
      circle.on('mouseup', function() {
        writeMessage('Mouseup circle');
      });

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

      // add the layer to the stage
      stage.add(layer);
    </script>
  </body>
</html>