Stackedit/public/res/extensions/scrollLink.js

267 lines
9.5 KiB
JavaScript
Raw Normal View History

2013-05-27 19:45:33 +00:00
define([
"jquery",
"underscore",
2013-06-22 23:48:57 +00:00
"classes/Extension",
2013-09-10 16:52:27 +00:00
"text!html/scrollLinkSettingsBlock.html"
2013-06-22 23:48:57 +00:00
], function($, _, Extension, scrollLinkSettingsBlockHTML) {
2013-05-29 19:55:23 +00:00
2013-12-05 00:25:17 +00:00
var scrollLink = new Extension("scrollLink", "Scroll Link", true, true);
2013-06-22 23:48:57 +00:00
scrollLink.settingsBlock = scrollLinkSettingsBlockHTML;
2013-07-28 10:35:04 +00:00
2014-04-14 00:21:06 +00:00
$.easing.easeOutSine = function( p ) {
return Math.cos((1 - p) * Math.PI / 2 );
};
2013-11-07 23:10:38 +00:00
var sectionList;
2013-07-26 00:44:12 +00:00
scrollLink.onSectionsCreated = function(sectionListParam) {
sectionList = sectionListParam;
};
2014-03-19 00:33:57 +00:00
2014-03-17 02:01:46 +00:00
var $editorElt;
2013-11-07 23:10:38 +00:00
var $previewElt;
2013-05-29 19:55:23 +00:00
var mdSectionList = [];
var htmlSectionList = [];
2013-11-07 23:10:38 +00:00
var lastEditorScrollTop;
var lastPreviewScrollTop;
2013-05-29 19:55:23 +00:00
var buildSections = _.debounce(function() {
2014-03-17 02:01:46 +00:00
if(!isPreviewVisible) {
return;
}
2013-05-29 19:55:23 +00:00
mdSectionList = [];
2014-03-17 02:01:46 +00:00
var mdSectionOffset;
var scrollHeight;
2014-03-20 00:24:56 +00:00
var editorScrollTop = $editorElt.scrollTop();
$editorElt.find(".wmd-input-section").each(function() {
if(mdSectionOffset === undefined) {
// Force start to 0 for the first section
mdSectionOffset = 0;
return;
}
var $delimiterElt = $(this.firstChild);
// Consider div scroll position
var newSectionOffset = $delimiterElt.position().top + editorScrollTop;
2014-03-17 02:01:46 +00:00
mdSectionList.push({
startOffset: mdSectionOffset,
2014-03-20 00:24:56 +00:00
endOffset: newSectionOffset,
height: newSectionOffset - mdSectionOffset
2013-12-05 00:25:17 +00:00
});
2014-03-20 00:24:56 +00:00
mdSectionOffset = newSectionOffset;
});
// Last section
scrollHeight = $editorElt.prop('scrollHeight');
mdSectionList.push({
startOffset: mdSectionOffset,
endOffset: scrollHeight,
height: scrollHeight - mdSectionOffset
});
2013-05-29 19:55:23 +00:00
2014-03-17 02:01:46 +00:00
// Find corresponding sections in the preview
2013-05-29 19:55:23 +00:00
htmlSectionList = [];
2013-11-17 22:59:03 +00:00
var htmlSectionOffset;
2013-08-22 00:19:59 +00:00
var previewScrollTop = $previewElt.scrollTop();
2014-03-17 02:01:46 +00:00
$previewElt.find(".wmd-preview-section").each(function() {
if(htmlSectionOffset === undefined) {
// Force start to 0 for the first section
htmlSectionOffset = 0;
return;
}
2013-11-17 22:59:03 +00:00
var $delimiterElt = $(this);
// Consider div scroll position
var newSectionOffset = $delimiterElt.position().top + previewScrollTop;
htmlSectionList.push({
startOffset: htmlSectionOffset,
endOffset: newSectionOffset,
height: newSectionOffset - htmlSectionOffset
});
2013-05-29 19:55:23 +00:00
htmlSectionOffset = newSectionOffset;
});
// Last section
2014-03-17 02:01:46 +00:00
scrollHeight = $previewElt.prop('scrollHeight');
2013-05-29 19:55:23 +00:00
htmlSectionList.push({
startOffset: htmlSectionOffset,
endOffset: scrollHeight,
height: scrollHeight - htmlSectionOffset
});
2013-09-15 14:14:42 +00:00
// apply Scroll Link (-10 to have a gap > 9px)
2013-06-05 22:42:30 +00:00
lastEditorScrollTop = -10;
lastPreviewScrollTop = -10;
2013-08-22 00:19:59 +00:00
doScrollLink();
2013-05-29 19:55:23 +00:00
}, 500);
2013-06-03 22:19:52 +00:00
var isScrollEditor = false;
2013-05-29 19:55:23 +00:00
var isScrollPreview = false;
2013-09-10 16:52:27 +00:00
var isEditorMoving = false;
var isPreviewMoving = false;
var scrollingHelper = $('<div>');
var doScrollLink = _.throttle(function() {
2014-03-17 02:01:46 +00:00
if(!isPreviewVisible || mdSectionList.length === 0 || mdSectionList.length !== htmlSectionList.length) {
2013-05-29 19:55:23 +00:00
return;
}
2014-03-20 00:24:56 +00:00
var editorScrollTop = $editorElt.scrollTop();
editorScrollTop < 0 && (editorScrollTop = 0);
2013-08-22 00:19:59 +00:00
var previewScrollTop = $previewElt.scrollTop();
2013-09-09 23:32:24 +00:00
function getDestScrollTop(srcScrollTop, srcSectionList, destSectionList) {
2013-05-29 19:55:23 +00:00
// Find the section corresponding to the offset
2013-11-07 23:10:38 +00:00
var sectionIndex;
2013-05-29 19:55:23 +00:00
var srcSection = _.find(srcSectionList, function(section, index) {
sectionIndex = index;
return srcScrollTop < section.endOffset;
});
if(srcSection === undefined) {
2014-03-17 02:01:46 +00:00
// Something very bad happened
2013-06-03 22:19:52 +00:00
return;
2013-05-29 19:55:23 +00:00
}
var posInSection = (srcScrollTop - srcSection.startOffset) / (srcSection.height || 1);
2013-05-29 19:55:23 +00:00
var destSection = destSectionList[sectionIndex];
2013-09-09 23:32:24 +00:00
return destSection.startOffset + destSection.height * posInSection;
2013-05-29 19:55:23 +00:00
}
2013-11-07 23:10:38 +00:00
var destScrollTop;
2013-05-29 23:04:52 +00:00
// Perform the animation if diff > 9px
if(isScrollEditor === true) {
if(Math.abs(editorScrollTop - lastEditorScrollTop) <= 9) {
return;
}
2013-06-03 22:19:52 +00:00
isScrollEditor = false;
2013-05-29 19:55:23 +00:00
// Animate the preview
lastEditorScrollTop = editorScrollTop;
2013-11-07 23:10:38 +00:00
destScrollTop = getDestScrollTop(editorScrollTop, mdSectionList, htmlSectionList);
2013-09-09 23:32:24 +00:00
destScrollTop = _.min([
destScrollTop,
$previewElt.prop('scrollHeight') - $previewElt.outerHeight()
]);
if(Math.abs(destScrollTop - previewScrollTop) <= 9) {
// Skip the animation if diff is <= 9
lastPreviewScrollTop = previewScrollTop;
return;
2013-09-09 23:32:24 +00:00
}
2014-03-19 00:33:57 +00:00
scrollingHelper.stop('scrollLinkFx', true).css('value', 0).animate({
value: destScrollTop - previewScrollTop
}, {
easing: 'easeOutSine',
duration: 200,
2014-01-13 01:39:28 +00:00
queue: 'scrollLinkFx',
step: function(now) {
isPreviewMoving = true;
lastPreviewScrollTop = previewScrollTop + now;
2014-03-19 00:33:57 +00:00
$previewElt.scrollTop(lastPreviewScrollTop);
},
done: function() {
2014-04-08 23:20:48 +00:00
setTimeout(function() {
isPreviewMoving = false;
2014-04-08 23:20:48 +00:00
}, 10);
},
2014-01-13 01:39:28 +00:00
}).dequeue('scrollLinkFx');
2014-03-19 00:33:57 +00:00
2013-05-29 19:55:23 +00:00
}
else if(isScrollPreview === true) {
if(Math.abs(previewScrollTop - lastPreviewScrollTop) <= 9) {
return;
}
2013-06-03 22:19:52 +00:00
isScrollPreview = false;
2013-05-29 19:55:23 +00:00
// Animate the editor
lastPreviewScrollTop = previewScrollTop;
2013-11-07 23:10:38 +00:00
destScrollTop = getDestScrollTop(previewScrollTop, htmlSectionList, mdSectionList);
2014-03-20 00:24:56 +00:00
destScrollTop = _.min([
destScrollTop,
$editorElt.prop('scrollHeight') - $editorElt.outerHeight()
]);
2013-09-09 23:32:24 +00:00
if(Math.abs(destScrollTop - editorScrollTop) <= 9) {
// Skip the animation if diff is <= 9
lastEditorScrollTop = editorScrollTop;
return;
2013-09-09 23:32:24 +00:00
}
2014-03-19 00:33:57 +00:00
scrollingHelper.stop('scrollLinkFx', true).css('value', 0).animate({
value: destScrollTop - editorScrollTop
}, {
easing: 'easeOutSine',
duration: 200,
queue: 'scrollLinkFx',
step: function(now) {
isEditorMoving = true;
lastEditorScrollTop = editorScrollTop + now;
2014-03-20 00:24:56 +00:00
$editorElt.scrollTop(lastEditorScrollTop);
2014-03-19 00:33:57 +00:00
},
done: function() {
2014-04-08 23:20:48 +00:00
setTimeout(function() {
2014-03-19 00:33:57 +00:00
isEditorMoving = false;
2014-04-08 23:20:48 +00:00
}, 10);
2014-03-19 00:33:57 +00:00
},
}).dequeue('scrollLinkFx');
2013-05-29 19:55:23 +00:00
}
}, 100);
2013-05-29 19:55:23 +00:00
2013-09-09 00:08:55 +00:00
scrollLink.onLayoutResize = function() {
isScrollEditor = true;
buildSections();
2013-05-29 19:55:23 +00:00
};
2014-03-19 00:33:57 +00:00
2014-03-17 02:01:46 +00:00
var isPreviewVisible = true;
function setPreviewHidden() {
isPreviewVisible = false;
}
function setPreviewVisible() {
isPreviewVisible = true;
}
2014-03-19 00:33:57 +00:00
2014-03-17 02:01:46 +00:00
scrollLink.onLayoutConfigure = function(layoutGlobalConfig) {
layoutGlobalConfig.east__onclose = setPreviewHidden;
layoutGlobalConfig.south__onclose = setPreviewHidden;
layoutGlobalConfig.east__onopen_start = setPreviewVisible;
layoutGlobalConfig.south__onclose_start = setPreviewVisible;
};
2013-05-29 19:55:23 +00:00
2013-09-09 23:32:24 +00:00
scrollLink.onFileClosed = function() {
mdSectionList = [];
};
2013-09-15 14:14:42 +00:00
var scrollAdjust = false;
2013-08-22 00:19:59 +00:00
scrollLink.onReady = function() {
$previewElt = $(".preview-container");
2014-03-17 02:01:46 +00:00
$editorElt = $("#wmd-input");
2013-09-09 23:32:24 +00:00
2013-09-10 16:52:27 +00:00
$previewElt.scroll(function() {
2013-09-15 14:14:42 +00:00
if(isPreviewMoving === false && scrollAdjust === false) {
2013-09-10 16:52:27 +00:00
isScrollPreview = true;
isScrollEditor = false;
doScrollLink();
}
2013-09-15 14:14:42 +00:00
scrollAdjust = false;
2013-08-22 00:19:59 +00:00
});
2013-12-05 00:25:17 +00:00
var handleEditorScroll = function() {
2013-09-10 16:52:27 +00:00
if(isEditorMoving === false) {
isScrollEditor = true;
isScrollPreview = false;
doScrollLink();
}
2013-12-05 00:25:17 +00:00
};
2014-03-20 00:24:56 +00:00
$editorElt.scroll(handleEditorScroll);
2013-05-29 19:55:23 +00:00
};
2013-09-10 16:52:27 +00:00
2013-11-07 23:10:38 +00:00
var $previewContentsElt;
2013-09-09 23:32:24 +00:00
scrollLink.onPagedownConfigure = function(editor) {
2013-08-22 00:19:59 +00:00
$previewContentsElt = $("#preview-contents");
2013-06-02 00:38:23 +00:00
editor.getConverter().hooks.chain("postConversion", function(text) {
2013-06-03 22:19:52 +00:00
// To avoid losing scrolling position before elements are fully
// loaded
2013-08-22 00:19:59 +00:00
$previewContentsElt.height($previewContentsElt.height());
2013-06-02 00:38:23 +00:00
return text;
2013-05-29 19:55:23 +00:00
});
};
scrollLink.onPreviewFinished = function() {
2013-06-02 00:38:23 +00:00
// Now set the correct height
2013-09-15 14:14:42 +00:00
var previousHeight = $previewContentsElt.height();
2013-08-22 00:19:59 +00:00
$previewContentsElt.height("auto");
2013-09-15 14:14:42 +00:00
var newHeight = $previewContentsElt.height();
2013-06-03 22:19:52 +00:00
isScrollEditor = true;
2013-09-15 14:14:42 +00:00
if(newHeight < previousHeight) {
// We expect a scroll adjustment
scrollAdjust = true;
}
2013-06-03 22:19:52 +00:00
buildSections();
2013-05-29 19:55:23 +00:00
};
2013-05-25 00:34:04 +00:00
2013-05-29 19:55:23 +00:00
return scrollLink;
2014-03-19 00:33:57 +00:00
});