前端页面，使用 dom 鼠标拖拽画一个矩形和监听键盘
2024-10-19 14:44:47
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>RunJS</title>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<style type="text/css">
.container {
background: green;
height: 200px;
position: relative;
margin-left: 100px;
}
.rect {
position: absolute;
top: 0;
left: 0;
width: 0;
height: 0;
border: 1px solid red;
background: rgba(230, 230, 230, 0.5);
}
</style>
</head>
<body>
<div class="container">
<div class="rect"></div>
</div>
<script>
var $container = $(".container");
var $rect = $(".rect");
var parentOffset = $container.offset()
var startPoint = null;
var isDown = null;
function init(opts) {
$rect.css({
top: opts.top + 'px',
left: opts.left + 'px'
});
$rect.width(opts.width);
$rect.height(opts.height);
}
function reset() {
init({
top: 0,
left: 0,
width: 0,
height: 0
});
$rect.hide();
}
reset();
$rect.on('click', function(e) {
edit()
});
$container.on('mousedown', function(e) {
start(e);
});
$container.on("mousemove", function(e) {
move(e);
})
$container.on('mouseup', function(e) {
end(e);
});
$container.on('mouseleave', function(e) {
end(e);
});
document.addEventListener("keydown", keydown);
function start(e) {
var re1 = $(e.target);
if (re1.is($rect)) {
return
}
isDown = true;
$rect.width(0);
$rect.height(0);
$rect.show();
startPoint = {
y: e.pageY - parentOffset.top,
x: e.pageX - parentOffset.left
};
$rect.css({
top: startPoint.y + 'px',
left: + startPoint.x + 'px'
});
}
function move(e) {
if (isDown) {
$rect.width((e.pageX - parentOffset.left) - startPoint.x);
$rect.height((e.pageY - parentOffset.top )- startPoint.y);
}
}
function end(e) {
if (!isDown) {
return;
}
var x = e.pageX > (parentOffset.left + $container.width()) ? parentOffset.left + $container.width() : e.pageX;
var y = e.pageY > (parentOffset.top + $container.height()) ? parentOffset.top + $container.height() : e.pageY;
$rect.width((x - parentOffset.left) - startPoint.x);
$rect.height((y - parentOffset.top )- startPoint.y);
isDown = false;
startPoint = null;
save();
}
function save() {
console.log({
top: $rect.position().top,
left: $rect.position().left,
width: $rect.width(),
height: $rect.height()
})
}
function edit() {
console.log('edit');
}
function goNext() {
console.log('goNext');
}
function goPrev() {
console.log('goPrev');
}
function keydown(e) {
if (e.key === 'd' || e.key === "Delete") {
reset();
e.preventDefault();
} else if (e.key === 'e') {
edit();
e.preventDefault();
} else if (e.key === 'ArrowRight' || e.key === "f" || e.key === "Enter") {
goNext();
e.preventDefault();
} else if (e.key === 'ArrowLeft' || e.key === "s") {
goPrev();
e.preventDefault();
}
}
</script>
</body>
</html>
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