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ChangesetViewManager.js
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ChangesetViewManager.js
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/**
* @provides changeset-view-manager
* @requires javelin-dom
* javelin-util
* javelin-stratcom
* javelin-install
* javelin-workflow
* javelin-router
* javelin-behavior-device
* javelin-vector
*/
JX.install('ChangesetViewManager', {
construct : function(node) {
this._node = node;
var data = this._getNodeData();
this._renderURI = data.renderURI;
this._ref = data.ref;
this._whitespace = data.whitespace;
this._renderer = data.renderer;
this._highlight = data.highlight;
this._encoding = data.encoding;
},
members: {
_node: null,
_loaded: false,
_sequence: 0,
_stabilize: false,
_renderURI: null,
_ref: null,
_whitespace: null,
_renderer: null,
_highlight: null,
_encoding: null,
/**
* Has the content of this changeset been loaded?
*
* This method returns `true` if a request has been fired, even if the
* response has not returned yet.
*
* @return bool True if the content has been loaded.
*/
isLoaded: function() {
return this._loaded;
},
/**
* Configure stabilization of the document position on content load.
*
* When we dump the changeset into the document, we can try to stabilize
* the document scroll position so that the user doesn't feel like they
* are jumping around as things load in. This is generally useful when
* populating initial changes.
*
* However, if a user explicitly requests a content load by clicking a
* "Load" link or using the dropdown menu, this stabilization generally
* feels unnatural, so we don't use it in response to explicit user action.
*
* @param bool True to stabilize the next content fill.
* @return this
*/
setStabilize: function(stabilize) {
this._stabilize = stabilize;
return this;
},
/**
* Should this changeset load immediately when the page loads?
*
* Normally, changes load immediately, but if a diff or commit is very
* large we stop doing this and have the user load files explicitly, or
* choose to load everything.
*
* @return bool True if the changeset should load automatically when the
* page loads.
*/
shouldAutoload: function() {
return this._getNodeData().autoload;
},
/**
* Load this changeset, if it isn't already loading.
*
* This fires a request to fill the content of this changeset, provided
* there isn't already a request in flight. To force a reload, use
* @{method:reload}.
*
* @return this
*/
load: function() {
if (this._loaded) {
return this;
}
return this.reload();
},
/**
* Reload the changeset content.
*
* This method always issues a request, even if the content is already
* loading. To load conditionally, use @{method:load}.
*
* @return this
*/
reload: function() {
this._loaded = true;
this._sequence++;
var params = {
ref: this._ref,
whitespace: this._whitespace || '',
renderer: this.getRenderer() || '',
highlight: this._highlight || '',
encoding: this._encoding || ''
};
var workflow = new JX.Workflow(this._renderURI, params)
.setHandler(JX.bind(this, this._onresponse, this._sequence));
var routable = workflow.getRoutable();
routable
.setPriority(500)
.setType('content')
.setKey(this._getRoutableKey());
JX.Router.getInstance().queue(routable);
JX.DOM.setContent(
this._getContentFrame(),
JX.$N(
'div',
{className: 'differential-loading'},
'Loading...'));
return this;
},
/**
* Get the active @{class:JX.Routable} for this changeset.
*
* After issuing a request with @{method:load} or @{method:reload}, you
* can adjust routable settings (like priority) by querying the routable
* with this method. Note that there may not be a current routable.
*
* @return JX.Routable|null Active routable, if one exists.
*/
getRoutable: function() {
return JX.Router.getInstance().getRoutableByKey(this._getRoutableKey());
},
setRenderer: function(renderer) {
this._renderer = renderer;
return this;
},
getRenderer: function() {
if (this._renderer !== null) {
return this._renderer;
}
// TODO: This is a big pile of TODOs.
// NOTE: If you load the page at one device resolution and then resize to
// a different one we don't re-render the diffs, because it's a
// complicated mess and you could lose inline comments, cursor positions,
// etc.
var renderer = (JX.Device.getDevice() == 'desktop') ? '2up' : '1up';
// TODO: Once 1up works better, figure out when to show it.
renderer = '2up';
return renderer;
},
setEncoding: function(encoding) {
this._encoding = encoding;
return this;
},
getEncoding: function() {
return this._encoding;
},
setHighlight: function(highlight) {
this._highlight = highlight;
return this;
},
getHighlight: function() {
return this._highlight;
},
_getNodeData: function() {
return JX.Stratcom.getData(this._node);
},
_onresponse: function(sequence, response) {
if (sequence != this._sequence) {
// If this isn't the most recent request, ignore it. This normally
// means the user changed view settings between the time the page loaded
// and the content filled.
return;
}
// As we populate the changeset list, we try to hold the document scroll
// position steady, so that, e.g., users who want to leave a comment on a
// diff with a large number of changes don't constantly have the text
// area scrolled off the bottom of the screen until the entire diff loads.
//
// There are two three major cases here:
//
// - If we're near the top of the document, never scroll.
// - If we're near the bottom of the document, always scroll.
// - Otherwise, scroll if the changes were above the midline of the
// viewport.
var target = this._node;
var old_pos = JX.Vector.getScroll();
var old_view = JX.Vector.getViewport();
var old_dim = JX.Vector.getDocument();
// Number of pixels away from the top or bottom of the document which
// count as "nearby".
var sticky = 480;
var near_top = (old_pos.y <= sticky);
var near_bot = ((old_pos.y + old_view.y) >= (old_dim.y - sticky));
var target_pos = JX.Vector.getPos(target);
var target_dim = JX.Vector.getDim(target);
var target_mid = (target_pos.y + (target_dim.y / 2));
var view_mid = (old_pos.y + (old_view.y / 2));
var above_mid = (target_mid < view_mid);
var frame = this._getContentFrame();
JX.DOM.setContent(frame, JX.$H(response.changeset));
if (this._stabilize) {
if (!near_top) {
if (near_bot || above_mid) {
// Figure out how much taller the document got.
var delta = (JX.Vector.getDocument().y - old_dim.y);
window.scrollTo(old_pos.x, old_pos.y + delta);
}
}
this._stabilize = false;
}
if (response.coverage) {
for (var k in response.coverage) {
try {
JX.DOM.replace(JX.$(k), JX.$H(response.coverage[k]));
} catch (ignored) {
// Not terribly important.
}
}
}
},
_getContentFrame: function() {
return JX.DOM.find(this._node, 'div', 'changeset-view-content');
},
_getRoutableKey: function() {
return 'changeset-view.' + this._ref + '.' + this._sequence;
}
},
statics: {
getForNode: function(node) {
var data = JX.Stratcom.getData(node);
if (!data.changesetViewManager) {
data.changesetViewManager = new JX.ChangesetViewManager(node);
}
return data.changesetViewManager;
}
}
});

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