HTML5 Canvas 形状事件

要使用 Konva 检测形状事件，我们可以使用 on() 方法将事件处理程序绑定到节点。

on() 方法需要事件类型和在事件发生时执行的函数。

鼠标事件：mouseover、mouseout、mouseenter、mouseleave、mousemove、mousedown、mouseup、wheel、click、dblclick。

触摸事件：touchstart、touchmove、touchend、tap、dbltap。

指针事件：pointerdown、pointermove、pointereup、pointercancel、pointerover、pointerenter、pointerout、pointerleave、pointerclick、pointerdblclick。

拖动事件：dragstart、dragmove 和 dragend。

变换事件：transformstart、transform、transformend。

说明：在三角形上触发鼠标悬停和鼠标移出事件，在圆形上触发鼠标悬停、鼠标移出、鼠标按下和鼠标抬起事件。

Konva Binding_Events Demoview raw

<!DOCTYPE html>
<html>
  <head>
    <script src="https://unpkg.com/konva@9.3.18/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);
      }

      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();
        writeMessage('x: ' + mousePos.x + ', y: ' + mousePos.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>