/**
* Network Graph JS
* This File is a part of the GitList Project at http://gitlist.org
*
* @license http://www.opensource.org/licenses/bsd-license.php
* @author Lukas Domnick <lukx@lukx.de> http://github.com/lukx
*/
( function( $ ){
// global config
var cfg = {
laneColors: ['#ff0000', '#0000FF', '#00FFFF', '#00FF00', '#FFFF00', '#ff00ff'],
laneHeight: 20,
columnWidth: 42,
dotRadius: 3
};
// Define the jQuery Plugins
/**
* DragScrollr is a custom made x/y-Drag Scroll Plugin for Gitlist
*
* TODO: Make this touch-scrollable
*/
$.fn.dragScrollr = function() {
var lastX,
lastY,
hotZone = 200,
container = this.first(),
domElement = container[0]; // so basically container without the jQuery stuff
function handleMouseDown( evt ) {
container.on('mousemove', handleMouseMove);
container.on('mouseup', handleMouseUp);
container.on('mouseleave', handleMouseUp);
lastX = evt.pageX;
lastY = evt.pageY;
}
function handleMouseMove(evt) {
evt.preventDefault();
// save the last scroll position to figure out whether the scroll event has entered the hot zone
var lastScrollLeft = domElement.scrollLeft;
domElement.scrollLeft = domElement.scrollLeft + lastX - evt.pageX;
domElement.scrollTop = domElement.scrollTop + lastY - evt.pageY;
if( lastScrollLeft > hotZone && domElement.scrollLeft <= hotZone ) {
container.trigger('enterHotZone');
}
// when we move into the hot zone
lastX = evt.pageX;
lastY = evt.pageY;
}
function handleMouseUp(evt) {
container.off('mousemove', handleMouseMove)
.off('mouseup', handleMouseUp)
.off('mouseleave', handleMouseUp);
}
// now bind the initial event
container.on('mousedown', handleMouseDown);
// return this instead of container, because of the .first() we applied - remember?
return this;
};
function graphLaneManager() {
var that = {},
occupiedLanes = [];
// "private" methods
function findLaneNumberFor( commit ) {
if( commit.lane ) {
// oh? we've already got a lane?
return commit.lane.number;
}
// find out which lane may draw our dot on. Start with a free one
var laneNumber = findFreeLane();
// if the child is a merge, we need to figure out which lane we may render this commit on.
// Rules are simple: A "parent" by the same author as the merge may render on the same line as the child
// others take the next free lane.
// furthermore, commits in a linear line of events may stay on the same lane, too
if( commit.children.length > 0) {
if( !commit.children[0].isMerge // linear ...
|| ( commit.children[0].isMerge && commit.children[0].author.email === commit.author.email ) // same author
) {
laneNumber = commit.children[0].lane.number;
}
}
return laneNumber;
}
function findFreeLane() {
var i = 0;
while( true ) {
// if an array index is not yet defined or set to false, the lane with that number is free.
if( !occupiedLanes[i] ) {
return i;
}
i ++;
}
}
that.occupy = function( lane ) {
// make sure we work with lane numbers here
if( typeof lane === 'object' ) {
lane = lane.number;
}
occupiedLanes[lane] = true;
};
that.free = function( lane ) {
// make sure we work with lane numbers here
if( typeof lane === 'object' ) {
lane = lane.number;
}
occupiedLanes[lane] = false;
};
that.getLaneForCommit = function( commit ) {
// does this commit have a lane already?
if( commit.lane ) return commit.lane;
var laneNumber = findLaneNumberFor( commit );
return that.getLane( laneNumber );
};
that.getLane = function(laneNumber) {
return {
'number': laneNumber,
'centerY': ( laneNumber * cfg.laneHeight ) + (cfg.laneHeight/2),
'color': cfg.laneColors[ laneNumber % cfg.laneColors.length ]
};
};
return that;
}
function commitDetailOverlay( ) {
var that = {},
el = $('<div class="network-commit-overlay"></div>'),
imageDisplay = $('<img/>').appendTo(el),
messageDisplay = $('<h4></h4>').appendTo(el),
metaDisplay = $('<p></p>').appendTo(el),
authorDisplay = $('<a rel="author"></a>').appendTo(metaDisplay),
dateDisplay = $('<span></span>').appendTo(metaDisplay),
commit;
el.hide();
/**
* Pads an input number with one leading '0' if needed, and assure it's a string
*
* @param input Number
* @returns String
*/
function twoDigits( input ) {
if( input < 10 ) {
return '0' + input;
}
return '' + input;
}
/**
* Transform a JS Native Date Object to a string, maintaining the same format given in the commit_list view
* 'd/m/Y \\a\\t H:i:s'
*
* @param date Date
* @returns String
*/
function getDateString( date ) {
return twoDigits( date.getDate() ) + '/'
+ twoDigits( date.getMonth() + 1 ) + '/'
+ date.getFullYear() + ' at '
+ twoDigits(date.getHours()) + ':'
+ twoDigits(date.getMinutes()) + ':'
+ twoDigits(date.getSeconds());
}
/**
* update the author view
*
* @param author
*/
function setAuthor( author ) {
authorDisplay.html(author.name)
.attr('href', 'mailto:' + author.email );
imageDisplay.attr('src', author.image );
}
/**
* Set the commit that is being displayed in this detail overlay instance
*
* @param commit
* @return that
*/
that.setCommit = function( commit ) {
setAuthor( commit.author );
dateDisplay.html( ' authored on ' + getDateString( commit.date ) );
messageDisplay.html( commit.message );
return that;
};
// expose some jquery functions
that.show = function() {
el.show();
return that;
};
that.hide = function() {
el.hide();
return that;
};
that.appendTo = function(where) {
el.appendTo(where);
return that;
};
that.positionTo = function( x, y ) {
el.css('left', x + 'px');
el.css('top', y + 'px');
};
that.outerWidth = function( ) {
return el.outerWidth.apply(el, arguments);
};
return that;
}
function commitDataRetriever( startPage, callback ) {
var that = {},
nextPage = startPage,
isLoading = false,
indicatorElements;
that.updateIndicators = function() {
if( isLoading ) {
$(indicatorElements).addClass('loading-commits');
} else {
$(indicatorElements).removeClass('loading-commits');
}
};
that.bindIndicator = function( el ) {
if( !indicatorElements ) {
indicatorElements = $(el);
} else {
indicatorElements = indicatorElements.add(el);
}
};
that.unbindIndicator = function( el ) {
indicatorElements.not( el );
};
function handleNetworkDataLoaded(data) {
isLoading = false;
that.updateIndicators();
nextPage = data.nextPage;
if( !data.commits || data.commits.length === 0 ) {
callback( null );
}
callback(data.commits);
}
function handleNetworkDataError() {
throw "Network Data Error while retrieving Commits";
}
that.retrieve = function() {
if( !nextPage ) {
callback( null );
return;
}
isLoading = true;
that.updateIndicators();
$.ajax({
dataType: "json",
url: nextPage,
success: handleNetworkDataLoaded,
error: handleNetworkDataError
});
};
that.hasMore = function () {
return ( !!nextPage );
};
return that;
}
// the $(document).ready starting point
$( function() {
// initialise network graph only when there is one network graph container on the page
if( $('div.network-graph').length !== 1 ) {
return;
}
var
// the element into which we will render our graph
commitsGraph = $('div.network-graph').first(),
laneManager = graphLaneManager(),
dataRetriever = commitDataRetriever( commitsGraph.data('source'), handleCommitsRetrieved ),
paper = Raphael( commitsGraph[0], commitsGraph.width(), commitsGraph.height()),
usedColumns = 0,
detailOverlay = commitDetailOverlay();
dataRetriever.bindIndicator( commitsGraph.parent('.network-view') );
detailOverlay.appendTo( commitsGraph );
function handleEnterHotZone() {
dataRetriever.retrieve();
}
function handleCommitsRetrieved( commits ) {
// no commits or empty commits array? Well, we can't draw a graph of that
if( commits === null ) {
handleNoAvailableData();
return;
}
prepareCommits( commits );
renderCommits( commits );
}
function handleNoAvailableData() {
window.console && console.log('No (more) Data available');
}
var awaitedParents = {};
function prepareCommits( commits ) {
$.each( commits, function ( index, commit) {
prepareCommit( commit );
});
}
function prepareCommit( commit ) {
// make "date" an actual JS Date object
commit.date = new Date(commit.date*1000);
// the parents will be filled once they have become prepared
commit.parents = [];
// we will want to store this commit's children
commit.children = getChildrenFor( commit );
commit.isFork = ( commit.children.length > 1 );
commit.isMerge = ( commit.parentsHash.length > 1 );
// after a fork, the occupied lanes must be cleaned up. The children used some lanes we no longer occupy
if ( commit.isFork === true ) {
$.each( commit.children, function( key, thisChild ) {
// free this lane
laneManager.occupy( thisChild.lane );
});
}
commit.lane = laneManager.getLaneForCommit( commit );
// now the lane we chose must be marked occupied again.
laneManager.occupy( commit.lane );
registerAwaitedParentsFor( commit );
}
/**
* Add a new childCommit to the dictionary of awaited parents
*
* @param commit who is waiting?
*/
function registerAwaitedParentsFor( commit ) {
// This commit's parents are not yet known in our little world, as we are rendering following the time line.
// Therefore we are registering this commit as "waiting" for each of the parent hashes
$.each( commit.parentsHash, function( key, thisParentHash ) {
// If awaitedParents does not already have a key for thisParent's hash, initialise as array
if( !awaitedParents.hasOwnProperty(thisParentHash) ) {
awaitedParents[thisParentHash] = [ commit ];
} else {
awaitedParents[ thisParentHash ].push( commit );
}
});
}
function getChildrenFor( commit ) {
var children = [];
if( awaitedParents.hasOwnProperty( commit.hash )) {
// there are child commits waiting
children = awaitedParents[ commit.hash ];
// let the children know their parent objects
$.each( children, function(key, thisChild ) {
thisChild.parents.push( commit );
});
// remove this item from parentsBeingWaitedFor
delete awaitedParents[ commit.hash ];
}
return children;
}
var lastRenderedDate = new Date(0);
function renderCommits( commits ) {
var neededWidth = ((usedColumns + Object.keys(commits).length) * cfg.columnWidth);
if ( neededWidth > paper.width ) {
extendPaper( neededWidth, paper.height );
} else if( dataRetriever.hasMore() ) {
// this is the case when we have not loaded enough commits to fill the paper yet. Get some more then...
dataRetriever.retrieve();
}
$.each( commits, function ( index, commit) {
if( lastRenderedDate.getYear() !== commit.date.getYear()
|| lastRenderedDate.getMonth() !== commit.date.getMonth()
|| lastRenderedDate.getDate() !== commit.date.getDate() ) {
// TODO: If desired, one could add a time scale on top, maybe.
}
renderCommit(commit);
});
}
function renderCommit( commit ) {
// find the column this dot is drawn on
usedColumns++;
commit.column = usedColumns;
commit.dot = paper.circle( getXPositionForColumnNumber(commit.column), commit.lane.centerY, cfg.dotRadius );
commit.dot.attr({
fill: commit.lane.color,
stroke: 'none',
cursor: 'pointer'
})
.data('commit', commit)
.mouseover( handleCommitMouseover )
.mouseout( handleCommitMouseout )
.click( handleCommitClick );
// maybe we have not enough space for the lane yet
if( commit.lane.centerY + cfg.laneHeight > paper.height ) {
extendPaper( paper.width, commit.lane.centerY + cfg.laneHeight )
}
$.each( commit.children, function ( idx, thisChild ) {
// if there is one child only, stay on the commit's lane as long as possible when connecting the dots.
// but if there is more than one child, switch to the child's lane ASAP.
// this is to display merges and forks where they happen (ie. at a commit node/ a dot), rather than
// connecting from a line.
// So: commit.isFork decides whether or not we must switch lanes early
connectDots( commit, thisChild, commit.isFork );
});
}
/**
*
* @param firstCommit
* @param secondCommit
* @param switchLanesEarly (boolean): Move the line to the secondCommit's lane ASAP? Defaults to false
*/
function connectDots( firstCommit, secondCommit, switchLanesEarly ) {
// default value for switchLanesEarly
switchLanesEarly = switchLanesEarly || false;
var lineLane = switchLanesEarly ? secondCommit.lane : firstCommit.lane;
// the connection has 4 stops, resulting in the following 3 segments:
// - from the x/y center of firstCommit.dot to the rightmost end (x) of the commit's column, with y=lineLane
// - from the rightmost end of firstCommit's column, to the leftmost end of secondCommit's column
// - from the leftmost end of secondCommit's column (y=lineLane) to the x/y center of secondCommit
paper.path(
getSvgLineString(
[firstCommit.dot.attr('cx'), firstCommit.dot.attr('cy')],
[firstCommit.dot.attr('cx') + (cfg.columnWidth/2), lineLane.centerY],
[secondCommit.dot.attr('cx') - (cfg.columnWidth/2), lineLane.centerY],
[secondCommit.dot.attr('cx'), secondCommit.dot.attr('cy')]
)
).attr({ "stroke": lineLane.color, "stroke-width": 2 }).toBack();
}
// set together a path string from any amount of arguments
// each argument is an array of [x, y] within the paper's coordinate system
function getSvgLineString( ) {
if (arguments.length < 2) return;
var svgString = 'M' + arguments[0][0] + ' ' + arguments[0][1];
for (var i = 1, j = arguments.length; i < j; i++){
svgString += 'L' + arguments[i][0] + ' ' + arguments[i][1];
}
return svgString;
}
function handleCommitMouseover(evt) {
detailOverlay.setCommit( this.data('commit'))
.show();
var xPos = evt.pageX - commitsGraph.offset().left + commitsGraph.scrollLeft() - (detailOverlay.outerWidth()/2);
// check that x doesn't run out the viewport
xPos = Math.max( xPos, commitsGraph.scrollLeft() + 10);
xPos = Math.min( xPos, commitsGraph.scrollLeft() + commitsGraph.width() - detailOverlay.outerWidth() - 10);
detailOverlay.positionTo( xPos,
evt.pageY - commitsGraph.offset().top + commitsGraph.scrollTop() + 10);
}
function handleCommitMouseout(evt) {
detailOverlay.hide();
}
function handleCommitClick( evt ) {
window.open( this.data('commit').details );
}
function getXPositionForColumnNumber( columnNumber ) {
// we want the column's center point
return ( paper.width - ( columnNumber * cfg.columnWidth ) + (cfg.columnWidth / 2 ));
}
function extendPaper( newWidth, newHeight ) {
var deltaX = newWidth - paper.width;
paper.setSize( newWidth, newHeight );
// fixup parent's scroll position
paper.canvas.parentNode.scrollLeft = paper.canvas.parentNode.scrollLeft + deltaX;
// now fixup the x positions of existing circles and lines
paper.forEach( function( el ) {
if( el.type === "circle" ) {
el.attr('cx', el.attr('cx') + deltaX);
} else if ( el.type === "path") {
var newXTranslation = el.data('currentXTranslation') || 0;
newXTranslation += deltaX;
el.transform( 't' + newXTranslation + ' 0' );
el.data('currentXTranslation', newXTranslation);
}
});
}
commitsGraph.dragScrollr();
commitsGraph.on('enterHotZone', handleEnterHotZone);
// load initial data
dataRetriever.retrieve( );
});
}( jQuery ));
