109 lines
3.2 KiB
JavaScript
109 lines
3.2 KiB
JavaScript
const EleResize = {
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_handleResize (e) {
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const ele = e.target || e.srcElement
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const trigger = ele.__resizeTrigger__
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if (trigger) {
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const handlers = trigger.__z_resizeListeners
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if (handlers) {
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const size = handlers.length
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for (let i = 0; i < size; i++) {
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const h = handlers[i]
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const handler = h.handler
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const context = h.context
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handler.apply(context, [e])
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}
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}
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}
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},
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_removeHandler (ele, handler, context) {
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const handlers = ele.__z_resizeListeners
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if (handlers) {
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const size = handlers.length
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for (let i = 0; i < size; i++) {
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const h = handlers[i]
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if (h.handler === handler && h.context === context) {
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handlers.splice(i, 1)
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return
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}
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}
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}
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},
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_createResizeTrigger (ele) {
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const obj = document.createElement('object')
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obj.setAttribute('style',
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'display: block; position: absolute; top: 0; left: 0; height: 100%; width: 100%; overflow: hidden;opacity: 0; pointer-events: none; z-index: -1;')
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obj.onload = EleResize._handleObjectLoad
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obj.type = 'text/html'
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ele.appendChild(obj)
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obj.data = 'about:blank'
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return obj
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},
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_handleObjectLoad (evt) {
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this.contentDocument.defaultView.__resizeTrigger__ = this.__resizeElement__
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this.contentDocument.defaultView.addEventListener('resize', EleResize._handleResize)
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}
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}
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if (document.attachEvent) { // ie9-10
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EleResize.on = function (ele, handler, context) {
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let handlers = ele.__z_resizeListeners
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if (!handlers) {
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handlers = []
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ele.__z_resizeListeners = handlers
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ele.__resizeTrigger__ = ele
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ele.attachEvent('onresize', EleResize._handleResize)
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}
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handlers.push({
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handler: handler,
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context: context
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})
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}
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EleResize.off = function (ele, handler, context) {
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const handlers = ele.__z_resizeListeners
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if (handlers) {
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EleResize._removeHandler(ele, handler, context)
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if (handlers.length === 0) {
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ele.detachEvent('onresize', EleResize._handleResize)
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delete ele.__z_resizeListeners
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}
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}
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}
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} else {
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EleResize.on = function (ele, handler, context) {
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let handlers = ele.__z_resizeListeners
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if (!handlers) {
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handlers = []
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ele.__z_resizeListeners = handlers
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if (getComputedStyle(ele, null).position === 'static') {
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ele.style.position = 'relative'
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}
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const obj = EleResize._createResizeTrigger(ele)
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ele.__resizeTrigger__ = obj
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obj.__resizeElement__ = ele
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}
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if (context != 'map') {
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handlers.push({
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handler: handler,
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context: context
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})
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}
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}
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EleResize.off = function (ele, handler, context) {
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const handlers = ele.__z_resizeListeners
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if (handlers) {
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EleResize._removeHandler(ele, handler, context)
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if (handlers.length === 0) {
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const trigger = ele.__resizeTrigger__
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if (trigger) {
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trigger.contentDocument.defaultView.removeEventListener('resize', EleResize._handleResize)
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ele.removeChild(trigger)
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delete ele.__resizeTrigger__
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}
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delete ele.__z_resizeListeners
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}
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}
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}
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}
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export default EleResize
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