devextreme
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HTML5 JavaScript Component Suite for Responsive Web Development
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JavaScript
/**
* DevExtreme (ui/scroll_view/ui.scroll_view.native.swipe_down.js)
* Version: 18.2.18
* Build date: Tue Oct 18 2022
*
* Copyright (c) 2012 - 2022 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
"use strict";
var $ = require("../../core/renderer"),
Callbacks = require("../../core/utils/callbacks"),
translator = require("../../animation/translator"),
eventUtils = require("../../events/utils"),
NativeStrategy = require("./ui.scrollable.native"),
LoadIndicator = require("../load_indicator"),
Deferred = require("../../core/utils/deferred").Deferred;
var SCROLLVIEW_PULLDOWN_DOWN_LOADING_CLASS = "dx-scrollview-pull-down-loading",
SCROLLVIEW_PULLDOWN_INDICATOR_CLASS = "dx-scrollview-pull-down-indicator",
SCROLLVIEW_PULLDOWN_REFRESHING_CLASS = "dx-scrollview-pull-down-refreshing",
PULLDOWN_ICON_CLASS = "dx-icon-pulldown",
STATE_RELEASED = 0,
STATE_READY = 1,
STATE_REFRESHING = 2,
STATE_TOUCHED = 4,
STATE_PULLED = 5;
var SwipeDownNativeScrollViewStrategy = NativeStrategy.inherit({
_init: function(scrollView) {
this.callBase(scrollView);
this._$topPocket = scrollView._$topPocket;
this._$bottomPocket = scrollView._$bottomPocket;
this._$pullDown = scrollView._$pullDown;
this._$scrollViewContent = scrollView.content();
this._initCallbacks();
this._location = 0
},
_initCallbacks: function() {
this.pullDownCallbacks = Callbacks();
this.releaseCallbacks = Callbacks();
this.reachBottomCallbacks = Callbacks()
},
render: function() {
this.callBase();
this._renderPullDown();
this._releaseState()
},
_renderPullDown: function() {
var $loadContainer = $("<div>").addClass(SCROLLVIEW_PULLDOWN_INDICATOR_CLASS),
$loadIndicator = new LoadIndicator($("<div>")).$element();
this._$icon = $("<div>").addClass(PULLDOWN_ICON_CLASS);
this._$pullDown.empty().append(this._$icon).append($loadContainer.append($loadIndicator))
},
_releaseState: function() {
this._state = STATE_RELEASED;
this._releasePullDown();
this._updateDimensions()
},
_releasePullDown: function() {
this._$pullDown.css({
opacity: 0
})
},
_updateDimensions: function() {
this.callBase();
this._topPocketSize = this._$topPocket.height();
this._bottomPocketSize = this._$bottomPocket.height();
this._scrollOffset = this._$container.height() - this._$content.height()
},
_allowedDirections: function() {
var allowedDirections = this.callBase();
allowedDirections.vertical = allowedDirections.vertical || this._pullDownEnabled;
return allowedDirections
},
handleInit: function(e) {
this.callBase(e);
if (this._state === STATE_RELEASED && 0 === this._location) {
this._startClientY = eventUtils.eventData(e.originalEvent).y;
this._state = STATE_TOUCHED
}
},
handleMove: function(e) {
this.callBase(e);
this._deltaY = eventUtils.eventData(e.originalEvent).y - this._startClientY;
if (this._state === STATE_TOUCHED) {
if (this._pullDownEnabled && this._deltaY > 0) {
this._state = STATE_PULLED
} else {
this._complete()
}
}
if (this._state === STATE_PULLED) {
e.preventDefault();
this._movePullDown()
}
},
_movePullDown: function() {
var pullDownHeight = this._getPullDownHeight(),
top = Math.min(3 * pullDownHeight, this._deltaY + this._getPullDownStartPosition()),
angle = 180 * top / pullDownHeight / 3;
this._$pullDown.css({
opacity: 1
}).toggleClass(SCROLLVIEW_PULLDOWN_REFRESHING_CLASS, top < pullDownHeight);
translator.move(this._$pullDown, {
top: top
});
this._$icon.css({
transform: "rotate(" + angle + "deg)"
})
},
_isPullDown: function() {
return this._pullDownEnabled && this._state === STATE_PULLED && this._deltaY >= this._getPullDownHeight() - this._getPullDownStartPosition()
},
_getPullDownHeight: function() {
return Math.round(.05 * this._$element.outerHeight())
},
_getPullDownStartPosition: function() {
return -Math.round(1.5 * this._$pullDown.outerHeight())
},
handleEnd: function() {
if (this._isPullDown()) {
this._pullDownRefreshing()
}
this._complete()
},
handleStop: function() {
this._complete()
},
_complete: function() {
if (this._state === STATE_TOUCHED || this._state === STATE_PULLED) {
this._releaseState()
}
},
handleScroll: function(e) {
this.callBase(e);
if (this._state === STATE_REFRESHING) {
return
}
var currentLocation = this.location().top,
scrollDelta = this._location - currentLocation;
this._location = currentLocation;
if (scrollDelta > 0 && this._isReachBottom()) {
this._reachBottom()
} else {
this._stateReleased()
}
},
_isReachBottom: function() {
return this._reachBottomEnabled && this._location <= this._scrollOffset + this._bottomPocketSize
},
_reachBottom: function() {
this.reachBottomCallbacks.fire()
},
_stateReleased: function() {
if (this._state === STATE_RELEASED) {
return
}
this._$pullDown.removeClass(SCROLLVIEW_PULLDOWN_DOWN_LOADING_CLASS);
this._releaseState()
},
_pullDownRefreshing: function() {
this._state = STATE_REFRESHING;
this._pullDownRefreshHandler()
},
_pullDownRefreshHandler: function() {
this._refreshPullDown();
this.pullDownCallbacks.fire()
},
_refreshPullDown: function() {
this._$pullDown.addClass(SCROLLVIEW_PULLDOWN_DOWN_LOADING_CLASS);
translator.move(this._$pullDown, {
top: this._getPullDownHeight()
})
},
pullDownEnable: function(enabled) {
this._$topPocket.toggle(enabled);
this._pullDownEnabled = enabled
},
reachBottomEnable: function(enabled) {
this._reachBottomEnabled = enabled
},
pendingRelease: function() {
this._state = STATE_READY
},
release: function() {
var deferred = new Deferred;
this._updateDimensions();
clearTimeout(this._releaseTimeout);
this._releaseTimeout = setTimeout(function() {
this._stateReleased();
this.releaseCallbacks.fire();
this._updateAction();
deferred.resolve()
}.bind(this), 800);
return deferred.promise()
},
dispose: function() {
clearTimeout(this._pullDownRefreshTimeout);
clearTimeout(this._releaseTimeout);
this.callBase()
}
});
module.exports = SwipeDownNativeScrollViewStrategy;