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https://github.com/TryGhost/Ghost.git
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5c9a824d53
no issue
- drops the `var Foo = Ember.Thing.extend({}); export default Foo;` syntax in favour of exporting directly, eg: `export default Ember.Thing.extend({})`
- discussion on this change [here](https://github.com/TryGhost/Ghost/pull/5340#issuecomment-105828423) and [here](https://github.com/TryGhost/Ghost/pull/5694#discussion-diff-37511606)
104 lines
3.1 KiB
JavaScript
104 lines
3.1 KiB
JavaScript
import Ember from 'ember';
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import setScrollClassName from 'ghost/utils/set-scroll-classname';
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export default Ember.Mixin.create({
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/**
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* Determine if the cursor is at the end of the textarea
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*/
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isCursorAtEnd: function () {
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var selection = this.$().getSelection(),
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value = this.getValue(),
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linesAtEnd = 3,
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stringAfterCursor,
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match;
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stringAfterCursor = value.substring(selection.end);
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/* jscs: disable */
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match = stringAfterCursor.match(/\n/g);
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/* jscs: enable */
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if (!match || match.length < linesAtEnd) {
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return true;
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}
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return false;
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},
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/**
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* Build an object that represents the scroll state
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*/
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getScrollInfo: function () {
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var scroller = this.get('element'),
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scrollInfo = {
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top: scroller.scrollTop,
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height: scroller.scrollHeight,
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clientHeight: scroller.clientHeight,
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diff: scroller.scrollHeight - scroller.clientHeight,
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padding: 50,
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isCursorAtEnd: this.isCursorAtEnd()
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};
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return scrollInfo;
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},
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/**
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* Calculate if we're within scrollInfo.padding of the end of the document, and scroll the rest of the way
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*/
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adjustScrollPosition: function () {
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// If we're receiving change events from the end of the document, i.e the user is typing-at-the-end, update the
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// scroll position to ensure both panels stay in view and in sync
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var scrollInfo = this.getScrollInfo();
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if (scrollInfo.isCursorAtEnd && (scrollInfo.diff >= scrollInfo.top) &&
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(scrollInfo.diff < scrollInfo.top + scrollInfo.padding)) {
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scrollInfo.top += scrollInfo.padding;
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// Scroll the left pane
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this.$().scrollTop(scrollInfo.top);
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}
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},
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/**
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* Send the scrollInfo for scrollEvents to the view so that the preview pane can be synced
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*/
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scrollHandler: function () {
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this.set('scrollThrottle', Ember.run.throttle(this, function () {
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this.sendAction('updateScrollInfo', this.getScrollInfo());
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}, 10));
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},
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/**
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* once the element is in the DOM bind to the events which control scroll behaviour
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*/
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attachScrollHandlers: function () {
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var $el = this.$();
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$el.on('keypress', Ember.run.bind(this, this.adjustScrollPosition));
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$el.on('scroll', Ember.run.bind(this, this.scrollHandler));
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$el.on('scroll', Ember.run.bind($el, setScrollClassName, {
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target: Ember.$('.js-entry-markdown'),
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offset: 10
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}));
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},
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/**
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* once the element has been removed from the DOM unbind from the events which control scroll behaviour
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*/
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detachScrollHandlers: function () {
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this.$().off('keypress');
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this.$().off('scroll');
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Ember.run.cancel(this.get('scrollThrottle'));
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},
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didInsertElement: function () {
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this._super();
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this.attachScrollHandlers();
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},
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willDestroyElement: function () {
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this._super();
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this.detachScrollHandlers();
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}
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});
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