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fix(touch-emulator): incorrect function (#5118)

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This commit is contained in:
iam2r 2019-11-26 20:24:55 +08:00 committed by neverland
parent f59beb9787
commit b2c53396ef
1 changed files with 14 additions and 19 deletions
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33
packages/vant-touch-emulator/index.js
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@ -78,36 +78,33 @@ function TouchList() {
return touchList;
}
/**
* Simple trick to fake touch event support
* this is enough for most libraries like Modernizr and Hammer
*/
function fakeTouchSupport() {
var objs = [window, document.documentElement];
var props = ['ontouchstart', 'ontouchmove', 'ontouchcancel', 'ontouchend'];
for (var o = 0; o < objs.length; o++) {
for (var p = 0; p < props.length; p++) {
if (objs[o] && objs[o][props[p]] === undefined) {
objs[o][props[p]] = null;
}
}
}
}
/**
* only trigger touches when the left mousebutton has been pressed
* @param touchType
* @returns {Function}
*/
var initiated = false;
function onMouse(touchType) {
return function(ev) {
// prevent mouse events
if (ev.which !== 1) {
return;
if (ev.type === 'mousedown') {
initiated = true;
}
if (ev.type === 'mouseup') {
initiated = false;
}
if (ev.type === 'mousemove' && !initiated) {
return
}
// The EventTarget on which the touch point started when it was first placed on the surface,
// even if the touch point has since moved outside the interactive area of that element.
// also, when the target doesnt exist anymore, we update it
@ -173,8 +170,6 @@ function getActiveTouches(mouseEv) {
* TouchEmulator initializer
*/
function TouchEmulator() {
fakeTouchSupport();
window.addEventListener('mousedown', onMouse('touchstart'), true);
window.addEventListener('mousemove', onMouse('touchmove'), true);
window.addEventListener('mouseup', onMouse('touchend'), true);