我试图通过拖动实现页面panorate。在我的实现中,在用户释放鼠标按钮后,页面会移动一段时间,例如在Google地图中拖动地图。现在我想避免这种效果,当用户释放按钮时鼠标不再移动。问题是,我只是无法弄清楚在触发事件时鼠标是否真的移动。如何检测mouseup被触发时鼠标是否在移动?
现在我试图通过计算拖动速度来解决这个问题,然后将速度与预先设定的“灵敏度”进行比较,该灵敏度在大多数情况下都有效,但有时会失败。
简化示例jsFiddle。当用小提琴演奏时,请使用FF中的中键,可拖动的div“粘”到左按钮。
伪代码:
AniMove = function (doc, element, sensitivity, panspeed, duration) {
var mouseDown = function (e) {
sTime = new Date();
originalX = mouseX = e.clientX;
originalY = mouseY = e.clientY;
/* addEventListeners mousemove & mouseup for document */
return;
},
mouseMove = function (e) {
/* Setting new position for #square + new mouseX & Y */
return;
},
mouseUp = function() {
var dc = 1;
/* removeEventListeners mousemove & mouseup */
eTime = new Date();
vX = Math.round((50 * panspeed) * (originalX - mouseX)/(eTime - sTime));
vY = Math.round((50 * panspeed) * (originalY - mouseY)/(eTime - sTime));
// Check whether mouse is moving or not,
// now checking the speed against sensitivity, which is not reliable
if (Math.abs(vX) < sensitivity){vX = 0;}
if (Math.abs(vY) < sensitivity){vY = 0;}
for (n = 0; n < dur; n++, dc += 0.001) {
vX = Math.round(vX * dec/dc);
vY = Math.round(vY * dec/dc);
delay[n] = setTimeout(endDrag(n, vX, vY), n * 50);
}
return;
},
endDrag = function (n, vX, vY) {
/* Setting new position for #square */
return;
},
dec = 1 - 120/duration;
panspeed *= -0.01;
duration /= 50;
element.addEventListener('mousedown', mouseDown, false);
}
drag = new AniMove(document, document.getElementById('square'), 20, 100, 500);
那么,它甚至有可能,如果鼠标在这种情况下移动或不检测?也许我需要一个不同的方法来完成这项任务?
谢谢,现在它工作!想到10毫秒的伎俩。工作小提琴:http://jsfiddle.net/cww55/7/ – Teemu