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backbone.layoutmanager.js
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/*!
* backbone.layoutmanager.js v0.6.5
* Copyright 2012, Tim Branyen (@tbranyen)
* backbone.layoutmanager.js may be freely distributed under the MIT license.
*/
(function(window) {
"use strict";
// Used to keep track of all LayoutManager key names.
var keys;
// Alias the libraries from the global object.
var Backbone = window.Backbone;
var _ = window._;
var $ = window.$;
// Store references to original View functions.
var _configure = Backbone.View.prototype._configure;
var render = Backbone.View.prototype.render;
// A LayoutManager is simply a Backbone.View with some sugar.
var LayoutManager = Backbone.View.extend({
// This named function allows for significantly easier debugging.
constructor: function Layout(options) {
// Options should always a valid object.
options = options || {};
// Give this View superpowers.
LayoutManager.setupView(this, options);
// Have Backbone set up the rest of this View.
Backbone.View.call(this, options);
},
// Swap the current layout to new layout.
swapLayout: function(newLayout) {
// Set Views to be a hybrid of original and new layout.
newLayout.views = _.defaults({}, this.views, newLayout.views);
// Re-use the same layout DOM element.
newLayout.setElement(this.el);
// Allow for chainability.
return newLayout;
},
// Shorthand to root.view function with append flag.
insertView: function(selector, view) {
// If a selector was passed, forward that onto setView.
if (view) {
return this.setView(selector, view, true);
}
// Omitting a selector will place the View directly into the parent.
return this.setView(selector, true);
},
// Works like insertView, except allows you to bulk insert via setViews.
insertViews: function(views) {
// Ensure each view is wrapped in an array.
_.each(views, function(view, selector) {
views[selector] = [].concat(view);
});
return this.setViews(views);
},
// Will return a single view that matches the filter function.
getView: function(fn) {
return this.getViews(fn).first().value();
},
// Provide a filter function to get a flattened array of all the subviews.
// If the filter function is omitted it will return all subviews.
getViews: function(fn) {
// Flatten all views.
var views = _.chain(this.views).map(function(view) {
return [].concat(view);
}, this).flatten().value();
// Return a wrapped function to allow for easier chaining.
return _.chain(_.filter(views, fn ? fn : _.identity));
},
// This takes in a partial name and view instance and assigns them to
// the internal collection of views. If a view is not a LayoutManager
// instance, then mix in the LayoutManager prototype. This ensures
// all Views can be used successfully.
//
// Must definitely wrap any render method passed in or defaults to a
// typical render function `return layout(this).render()`.
setView: function(name, view, append) {
var partials, options;
var root = this;
// If no name was passed, use an empty string and shift all arguments.
if (!_.isString(name)) {
append = view;
view = name;
name = "";
}
// If the parent View's object, doesn't exist... create it.
this.views = this.views || {};
// Ensure remove is called when swapping View's.
if (!append && this.views[name]) {
// If the views are an array, iterate and remove each individually.
if (_.isArray(this.views[name])) {
_.each(this.views[name], function(view) {
view.remove();
});
// Otherwise it's a single view and can safely call remove.
} else {
this.views[name].remove();
}
}
// If the View has not been properly set up, throw an Error message
// indicating that the View needs `manage: true` set.
if (!view.__manager__) {
throw new Error("manage property not set. " +
"http://tbranyen.github.com/backbone.layoutmanager/#usage/struc" +
"turing-a-view");
}
// Instance overrides take precedence, fallback to prototype options.
options = view._options();
// Set up the View, if it's not already managed.
if (!view.__manager__) {
LayoutManager.setupView(view, options);
}
// Custom template render function.
view.render = function(done) {
var viewDeferred = options.deferred();
var manager = view.__manager__;
// Ensure the latest deferred is assigned.
manager.viewDeferred = viewDeferred;
// Break this callback out so that its not duplicated inside the
// following safety try/catch.
function renderCallback() {
// List items should not be re-added, unless they have `keep: true`
// set.
if ((!append || view.keep) || !manager.hasRendered) {
options.partial(root.el, name, view.el, append);
}
// Ensure events are always correctly bound after rendering.
view.delegateEvents();
// If the View has a managed handler, resolve and remove it.
if (manager.handler) {
// Resolve the View's render handler deferred.
manager.handler.resolveWith(view, [view.el]);
// Remove the handler once it has resolved.
delete manager.handler;
}
// When a view has been resolved, ensure that it is correctly updated
// and that any done callbacks are triggered.
viewDeferred.resolveWith(view, [view.el]);
// Only call the done function if a callback was provided.
if (_.isFunction(done)) {
done.call(view, view.el);
}
}
// Remove subViews without the `keep` flag set to `true`.
view._removeView();
// Call the original render method.
LayoutManager.prototype.render.call(view).then(renderCallback);
// Return the promise for chainability.
return viewDeferred.promise();
};
// Add reference to the parentView.
view.__manager__.parent = root;
// Add reference to the placement selector used.
view.__manager__.selector = name;
// Special logic for appending items. List items are represented as an
// array.
if (append) {
// Start with an array if none exists.
partials = this.views[name] = this.views[name] || [];
if (!_.isArray(this.views[name])) {
// Ensure this.views[name] is an array.
partials = this.views[name] = [this.views[name]];
}
// Ensure the View is not already added to the list. If it is, bail out
// early.
if (_.indexOf(partials, view) > -1) {
return view;
}
// Add the view to the list of partials.
partials.push(view);
// Put the view into `append` mode.
view.__manager__.append = true;
return view;
}
// Assign to main views object and return for chainability.
return this.views[name] = view;
},
// Allows the setting of multiple views instead of a single view.
setViews: function(views) {
// Iterate over all the views and use the View's view method to assign.
_.each(views, function(view, name) {
// If the view is an array put all views into insert mode.
if (_.isArray(view)) {
return _.each(view, function(view) {
this.insertView(name, view);
}, this);
}
// Assign each view using the view function.
this.setView(name, view);
}, this);
// Allow for chaining
return this;
},
// By default this should find all nested views and render them into
// the this.el and call done once all of them have successfully been
// resolved.
//
// This function returns a promise that can be chained to determine
// once all subviews and main view have been rendered into the view.el.
render: function(done) {
var root = this;
var options = this._options();
var viewDeferred = options.deferred();
// Ensure duplicate renders don't override.
if (this.__manager__.renderDeferred) {
// Set the most recent done callback.
this.__manager__.callback = done;
// Return the deferred.
return this.__manager__.renderDeferred;
}
// Wait until this View has rendered before dealing with nested Views.
this._render(LayoutManager._viewRender).fetch.then(function() {
// Disable the ability for any new sub-views to be added.
root.__manager__.renderDeferred = viewDeferred;
// Create a list of promises to wait on until rendering is done. Since
// this method will run on all children as well, its sufficient for a
// full hierarchical.
var promises = _.map(root.views, function(view) {
// Hoist deferred var, used later on...
var def;
// Ensure views are rendered in sequence
function seqRender(views, done) {
// Once all views have been rendered invoke the sequence render
// callback.
if (!views.length) {
return done();
}
// Get each view in order, grab the first one off the stack.
var view = views.shift();
// Render the View and once complete call the next view.
view.render(function() {
// Invoke the recursive sequence render function with the
// remaining views.
seqRender(views, done);
});
}
// If rendering a list out, ensure they happen in a serial order.
if (_.isArray(view)) {
// A singular deferred that represents all the items.
def = options.deferred();
seqRender(_.clone(view), function() {
def.resolve();
});
return def.promise();
}
// Only return the fetch deferred, resolve the main deferred after
// the element has been attached to it's parent.
return view.render();
});
// Once all subViews have been rendered, resolve this View's deferred.
options.when(promises).then(function() {
viewDeferred.resolveWith(root, [root.el]);
});
});
// Return a promise that resolves once all immediate subViews have
// rendered.
return viewDeferred.then(function() {
// Only call the done function if a callback was provided.
if (_.isFunction(done)) {
done.call(root, root.el);
}
if (root.__manager__.handler) {
root.__manager__.handler.resolveWith(root, [root.el]);
// Remove the handler, so it's never accidentally referenced.
delete root.__manager__.handler;
}
// If the render was called twice, there is a possibility that the
// callback style was used twice. This will ensure the latest callback
// is also triggered.
if (_.isFunction(root.__manager__.callback)) {
root.__manager__.callback.call(root, root.el);
// Remove the most recent callback.
delete root.__manager__.callback;
}
// Remove the rendered deferred.
delete root.__manager__.renderDeferred;
});
},
// Ensure the cleanup function is called whenever remove is called.
remove: function() {
LayoutManager.cleanViews(this);
// Call the original remove function.
return this._remove.apply(this, arguments);
},
// Merge instance and global options.
_options: function() {
// Instance overrides take precedence, fallback to prototype options.
return _.extend({}, this, LayoutManager.prototype.options, this.options);
}
},
{
// Clearable cache.
_cache: {},
// Creates a deferred and returns a function to call when finished.
_makeAsync: function(options, done) {
var handler = options.deferred();
// Used to handle asynchronous renders.
handler.async = function() {
handler._isAsync = true;
return done;
};
return handler;
},
// This gets passed to all _render methods.
_viewRender: function(root) {
var url, contents, handler;
var options = root._options();
// Once the template is successfully fetched, use its contents to
// proceed. Context argument is first, since it is bound for
// partial application reasons.
function done(context, contents) {
// Ensure the cache is up-to-date.
LayoutManager.cache(url, contents);
// Render the View into the el property.
if (contents) {
options.html(root.el, options.render(contents, context));
}
// Resolve only the fetch (used internally) deferred with the View
// element.
handler.fetch.resolveWith(root, [root.el]);
}
return {
// This render function is what gets called inside of the View render,
// when manage(this).render is called. Returns a promise that can be
// used to know when the element has been rendered into its parent.
render: function(context) {
var manager = root.__manager__;
var template = root.template || options.template;
if (root.serialize) {
options.serialize = root.serialize;
}
// Seek out serialize method and use that object.
if (!context && _.isFunction(options.serialize)) {
context = options.serialize.call(root);
// If serialize is an object, just use that.
} else if (!context && _.isObject(options.serialize)) {
context = options.serialize;
}
// Create an asynchronous handler.
handler = LayoutManager._makeAsync(options, _.bind(done, root,
context));
// Make a new deferred purely for the fetch function.
handler.fetch = options.deferred();
// Assign the handler internally to be resolved once its inside the
// parent element.
manager.handler = handler;
// Set the url to the prefix + the view's template property.
if (_.isString(template)) {
url = manager.prefix + template;
}
// Check if contents are already cached.
if (contents = LayoutManager.cache(url)) {
done(context, contents, url);
return handler;
}
// Fetch layout and template contents.
if (_.isString(template)) {
contents = options.fetch.call(handler, manager.prefix + template);
// If its not a string just pass the object/function/whatever.
} else if (template != null) {
contents = options.fetch.call(handler, template);
}
// If the function was synchronous, continue execution.
if (!handler._isAsync) {
done(context, contents);
}
return handler;
}
};
},
// Accept either a single view or an array of views to clean of all DOM
// events internal model and collection references and all Backbone.Events.
cleanViews: function(views) {
// Clear out all existing views.
_.each([].concat(views), function(view) {
// Remove all custom events attached to this View.
view.unbind();
// Ensure all nested views are cleaned as well.
if (view.views) {
_.each(view.views, function(view) {
LayoutManager.cleanViews(view);
});
}
// If a custom cleanup method was provided on the view, call it after
// the initial cleanup is done
if (_.isFunction(view.cleanup)) {
view.cleanup.call(view);
}
});
},
// Cache templates into LayoutManager._cache.
cache: function(path, contents) {
// If template path is found in the cache, return the contents.
if (path in this._cache) {
return this._cache[path];
// Ensure path and contents aren't undefined.
} else if (path != null && contents != null) {
return this._cache[path] = contents;
}
// If the template is not in the cache, return undefined.
},
// This static method allows for global configuration of LayoutManager.
configure: function(opts) {
_.extend(LayoutManager.prototype.options, opts);
// Allow LayoutManager to manage Backbone.View.prototype.
if (opts.manage) {
Backbone.View.prototype.manage = true;
}
},
// Configure a View to work with the LayoutManager plugin.
setupView: function(view, options) {
var views, viewOptions;
var proto = Backbone.LayoutManager.prototype;
var viewOverrides = _.pick(view, keys);
// If the View has already been setup, no need to do it again.
if (view.__manager__) {
return;
}
// Ensure necessary properties are set.
_.defaults(view, {
// Ensure a view always has a views object.
views: {},
// Internal state object used to store whether or not a View has been
// taken over by layout manager and if it has been rendered into the DOM.
__manager__: {},
// Add options into the prototype.
_options: LayoutManager.prototype._options,
// Add the ability to remove all Views.
_removeView: LayoutManager._removeView
});
// Set the prefix for a layout.
if (view instanceof Backbone.Layout) {
view.__manager__.prefix = view._options().paths.layout || "";
// Set the prefix for a template.
} else {
view.__manager__.prefix = view._options().paths.template || "";
}
// Extend the options with the prototype and passed options.
options = view.options = _.defaults(options || {}, view.options,
proto.options);
// Ensure view events are properly copied over.
viewOptions = _.pick(options, ["events"].concat(_.values(options.events)));
_.extend(view, viewOptions);
// If the View still has the Backbone.View#render method, remove it. Don't
// want it accidentally overriding the LM render.
delete viewOverrides.render;
// Pick out the specific properties that can be dynamically added at
// runtime and ensure they are available on the view object.
_.extend(options, viewOverrides);
// By default the original Remove function is the Backbone.View one.
view._remove = Backbone.View.prototype.remove;
// Always use this render function when using LayoutManager.
view._render = function(manage) {
var renderDeferred;
// Cache these properties.
var beforeRender = this._options().beforeRender;
var afterRender = this._options().afterRender;
// Ensure all subViews are properly scrubbed.
this._removeView();
// If a beforeRender function is defined, call it.
if (_.isFunction(beforeRender)) {
beforeRender.call(this, this);
}
// Always emit a beforeRender event.
this.trigger("beforeRender", this);
// Render!
renderDeferred = manage(this).render();
// Once rendering is complete...
renderDeferred.then(function() {
// Keep the view consistent between callbacks and deferreds.
var view = this;
// Shorthand the manager.
var manager = view.__manager__;
// Shorthand the View's parent.
var parent = manager.parent;
// This can be called immediately if the conditions allow, or it will
// be deferred until a parent has finished rendering.
var done = function() {
// Ensure events are always correctly bound after rendering.
view.delegateEvents();
// Set the view hasRendered.
view.__manager__.hasRendered = true;
// If an afterRender function is defined, call it.
if (_.isFunction(afterRender)) {
afterRender.call(view, view);
}
// Always emit an afterRender event.
view.trigger("afterRender", view);
};
// This function recursively loops through Views to find
// the most top level parent.
var findRootParent = function(view) {
var manager = view.__manager__;
// If a parent exists and the parent has not rendered, return that
// parent.
if (manager.parent && !manager.parent.__manager__.hasRendered) {
return manager.parent;
}
// This is the most root parent.
return view;
};
// If no parent exists, immediately call the done callback.
if (!parent) {
return done.call(view);
}
// If this view has already rendered, simply call the callback.
if (parent.__manager__.hasRendered) {
return options.when([manager.viewDeferred, parent.__manager__.viewDeferred]).then(function() {
done.call(view);
});
}
// Find the parent highest in the chain that has not yet rendered.
parent = findRootParent(view);
// Once the parent has finished rendering, trickle down and
// call sub-view afterRenders.
parent.on("afterRender", function() {
// Ensure its properly unbound immediately.
parent.off(null, null, view);
// Call the done callback.
done.call(view);
}, view);
});
return renderDeferred;
};
// Ensure the render is always set correctly.
view.render = LayoutManager.prototype.render;
// If the user provided their own remove override, use that instead of the
// default.
if (view.remove !== proto.remove) {
view._remove = view.remove;
view.remove = proto.remove;
}
// Normalize views to exist on either instance or options, default to
// options.
views = options.views || view.views;
// Set the internal views, only if selectors have been provided.
if (_.keys(views).length) {
view.setViews(views);
}
// Ensure the template is mapped over.
if (view.template) {
options.template = view.template;
// Remove it from the instance.
delete view.template;
}
},
// Remove all subViews.
_removeView: function(root) {
// Allow removeView to be called on instances.
root = root || this;
// Iterate over all of the view's subViews.
root.getViews().each(function(view) {
// Shorthand the manager for easier access.
var manager = view.__manager__;
// Test for keep.
var keep = _.isBoolean(view.keep) ? view.keep : view.options.keep;
// Only remove views that do not have `keep` attribute set.
if (!keep && manager.append === true && manager.hasRendered) {
// Remove the View completely.
view.remove();
// If this is an array of items remove items that are not marked to
// keep.
if (_.isArray(manager.parent.views[manager.selector])) {
// Remove directly from the Array reference.
return manager.parent.getView(function(view, i) {
// If the selectors match, splice off this View.
if (view.__manager__.selector === manager.selector) {
manager.parent.views[manager.selector].splice(i, 1);
}
});
}
// Otherwise delete the parent selector.
delete manager.parent[manager.selector];
}
});
}
});
// Ensure all Views always have access to get/set/insert(View/Views).
_.each(["get", "set", "insert"], function(method) {
var backboneProto = Backbone.View.prototype;
var layoutProto = LayoutManager.prototype;
// Attach the singular form.
backboneProto[method + "View"] = layoutProto[method + "View"];
// Attach the plural form.
backboneProto[method + "Views"] = layoutProto[method + "Views"];
});
// Convenience assignment to make creating Layout's slightly shorter.
Backbone.Layout = Backbone.LayoutManager = LayoutManager;
// A LayoutView is just a Backbone.View with manage set to true.
Backbone.LayoutView = Backbone.View.extend({
manage: true
});
// Override _configure to provide extra functionality that is necessary in
// order for the render function reference to be bound during initialize.
Backbone.View.prototype._configure = function() {
// Run the original _configure.
var retVal = _configure.apply(this, arguments);
// If manage is set, do it!
if (this.manage) {
// Set up this View.
LayoutManager.setupView(this);
}
// Act like nothing happened.
return retVal;
};
// Default configuration options; designed to be overriden.
LayoutManager.prototype.options = {
// Layout and template properties can be assigned here to prefix
// template/layout names.
paths: {},
// Can be used to supply a different deferred implementation.
deferred: function() {
return $.Deferred();
},
// Fetch is passed a path and is expected to return template contents as a
// function or string.
fetch: function(path) {
return _.template($(path).html());
},
// This is really the only way you will want to partially apply a view into
// a layout. Its entirely possible you'll want to do it differently, so
// this method is available to change.
partial: function(root, name, el, append) {
// If no selector is specified, assume the parent should be added to.
var $root = name ? $(root).find(name) : $(root);
// If no root found, return false.
if (!$root.length) {
return false;
}
// Use the append method if append argument is true.
this[append ? "append" : "html"]($root, el);
// If successfully added, return true.
return true;
},
// Override this with a custom HTML method, passed a root element and an
// element to replace the innerHTML with.
html: function(root, el) {
$(root).html(el);
},
// Very similar to HTML except this one will appendChild.
append: function(root, el) {
$(root).append(el);
},
// Return a deferred for when all promises resolve/reject.
when: function(promises) {
return $.when.apply(null, promises);
},
// By default, render using underscore's templating.
render: function(template, context) {
return template(context);
}
};
// Maintain a list of the keys at define time.
keys = _.keys(LayoutManager.prototype.options);
})(this);