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>