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133 lines
3.9 KiB
JavaScript
133 lines
3.9 KiB
JavaScript
import Ember from 'ember';
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// A discussion 'item' represents one item in the post stream. In other words, a
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// single item may represent a single post, or it may represent a gap of many
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// posts which have not been loaded.
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export default Ember.View.extend({
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classNames: ['item'],
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classNameBindings: ['item.gap:gap', 'loading', 'direction'],
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attributeBindings: [
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'start:data-start',
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'end:data-end',
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'time:data-time',
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'number:data-number'
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],
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start: function() {
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return this.get('item.indexStart');
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}.property('item.indexStart'),
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end: function() {
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return this.get('item.indexEnd');
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}.property('item.indexEnd'),
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count: function() {
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return this.get('end') - this.get('start') + 1;
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}.property('start', 'end'),
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time: function() {
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return this.get('item.post.time');
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}.property('item.post.time'),
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number: function() {
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return this.get('item.post.number');
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}.property('item.post.number'),
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loading: function() {
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return this.get('item.loading');
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}.property('item.loading'),
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direction: function() {
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return this.get('item.direction');
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}.property(),
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loadingChanged: function() {
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this.rerender();
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}.observes('loading'),
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render: function(buffer) {
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if (! this.get('item.gap')) {
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return this._super(buffer);
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}
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buffer.push('<span>');
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if (this.get('loading')) {
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buffer.push(' ');
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} else {
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buffer.push(this.get('count')+' more post'+(this.get('count') != 1 ? 's' : ''));
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}
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buffer.push('</span>');
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},
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didInsertElement: function() {
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if (! this.get('item.gap')) {
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return;
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}
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if (this.get('loading')) {
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var view = this;
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Ember.run.scheduleOnce('afterRender', function() {
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view.$().spin('small');
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});
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} else {
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var self = this;
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this.$().hover(function(e) {
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var up = e.clientY > $(this).offset().top - $(document).scrollTop() + $(this).outerHeight(true) / 2;
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self.set('direction', up ? 'up' : 'down');
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});
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}
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},
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load: function(relativeIndex) {
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// If this item is not a gap, or if we're already loading its posts,
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// then we don't need to do anything.
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if (! this.get('item.gap') || this.get('loading')) {
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return false;
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}
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// If new posts are being loaded in an upwards direction, then when they
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// are rendered, the rest of the posts will be pushed down the page.
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// However, we want to maintain the current scroll position relative to
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// the content after the gap. To do this, we need to find item directly
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// after the gap and use it as an anchor.
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if (this.get('direction') === 'up') {
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var anchor = this.$().nextAll('.item:first');
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// Immediately after the posts have been loaded (but before they
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// have been rendered,) we want to grab the distance from the top of
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// the viewport to the top of the anchor element.
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this.get('controller.postStream').one('postsLoaded', function() {
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if (anchor.length) {
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var scrollOffset = anchor.offset().top - $(document).scrollTop();
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}
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// After they have been rendered, we scroll back to a position
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// so that the distance from the top of the viewport to the top
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// of the anchor element is the same as before. If there is no
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// anchor (i.e. this gap is terminal,) then we'll scroll to the
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// bottom of the document.
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Ember.run.scheduleOnce('afterRender', function() {
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$('body').scrollTop(anchor.length
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? anchor.offset().top - scrollOffset
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: $('body').height());
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});
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});
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}
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// Tell the controller that we want to load the range of posts that this
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// gap represents. We also specify which direction we want to load the
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// posts from.
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this.get('controller').send(
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'loadRange',
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this.get('start') + (relativeIndex || 0),
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this.get('end'),
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this.get('direction') === 'up'
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);
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},
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click: function() {
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this.load();
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}
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});
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