76 lines
2.3 KiB
JavaScript
76 lines
2.3 KiB
JavaScript
import Ember from 'ember';
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import setScrollClassName from 'ghost/utils/set-scroll-classname';
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const {Component, computed, run} = Ember;
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const {equal} = computed;
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export default Component.extend({
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tagName: 'section',
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classNames: ['gh-view'],
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// updated when gh-ed-editor component scrolls
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editorScrollInfo: null,
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// updated when markdown is rendered
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height: null,
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activeTab: 'markdown',
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markdownActive: equal('activeTab', 'markdown'),
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previewActive: equal('activeTab', 'preview'),
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// HTML Preview listens to scrollPosition and updates its scrollTop value
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// This property receives scrollInfo from the textEditor, and height from the preview pane, and will update the
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// scrollPosition value such that when either scrolling or typing-at-the-end of the text editor the preview pane
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// stays in sync
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scrollPosition: computed('editorScrollInfo', 'height', function () {
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let scrollInfo = this.get('editorScrollInfo');
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let $previewContent = this.get('$previewContent');
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let $previewViewPort = this.get('$previewViewPort');
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if (!scrollInfo || !$previewContent || !$previewViewPort) {
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return 0;
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}
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let previewHeight = $previewContent.height() - $previewViewPort.height();
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let previewPosition, ratio;
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ratio = previewHeight / scrollInfo.diff;
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previewPosition = scrollInfo.top * ratio;
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return previewPosition;
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}),
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scheduleAfterRender() {
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run.scheduleOnce('afterRender', this, this.afterRenderEvent);
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},
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didInsertElement() {
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this._super(...arguments);
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this.scheduleAfterRender();
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},
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afterRenderEvent() {
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let $previewViewPort = this.$('.js-entry-preview-content');
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// cache these elements for use in other methods
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this.set('$previewViewPort', $previewViewPort);
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this.set('$previewContent', this.$('.js-rendered-markdown'));
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$previewViewPort.on('scroll', run.bind($previewViewPort, setScrollClassName, {
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target: this.$('.js-entry-preview'),
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offset: 10
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}));
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},
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willDestroyElement() {
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this._super(...arguments);
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// removes scroll handlers from the view
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this.get('$previewViewPort').off('scroll');
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},
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actions: {
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selectTab(tab) {
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this.set('activeTab', tab);
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}
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}
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});
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