mirror of
https://github.com/flynx/ImageGrid.git
synced 2025-10-29 10:20:08 +00:00
312 lines
7.4 KiB
JavaScript
Executable File
312 lines
7.4 KiB
JavaScript
Executable File
/**********************************************************************
|
|
*
|
|
*
|
|
*
|
|
**********************************************************************/
|
|
|
|
define(function(require){ var module = {}
|
|
console.log('>>> features')
|
|
|
|
//var DEBUG = DEBUG != null ? DEBUG : true
|
|
|
|
|
|
/*********************************************************************/
|
|
//
|
|
// Feature attributes:
|
|
// .tag - feature tag (string)
|
|
// this is used to identify the feature, its event handlers
|
|
// and DOM elements.
|
|
//
|
|
// .title - feature name (string | null)
|
|
// .doc - feature description (string | null)
|
|
//
|
|
// .priority - feature priority
|
|
// can be:
|
|
// - 'high' (99) | 'medium' (0) | 'low' (-99)
|
|
// - number
|
|
// - null (0, default)
|
|
// features with higher priority will be setup first,
|
|
// features with the same priority will be run in order of
|
|
// occurrence.
|
|
// .depends - feature dependencies -- tags of features that must setup
|
|
// before the feature (list | null)
|
|
// .exclusive - feature exclusivity tags (list | null)
|
|
// an exclusivity group enforces that only one feature in
|
|
// it will be run, i.e. the first / highest priority.
|
|
//
|
|
// .actions - action object containing feature actions (ActionSet | null)
|
|
// this will be mixed into the base object on .setup()
|
|
// and mixed out on .remove()
|
|
// .config - feature configuration, will be merged with base
|
|
// object's .config
|
|
// .handlers - feature event handlers (list | null)
|
|
//
|
|
//
|
|
//
|
|
// .handlers format:
|
|
// [
|
|
// [ <event-spec>, <handler-function> ],
|
|
// ...
|
|
// ]
|
|
//
|
|
// NOTE: both <event-spec> and <handler-function> must be compatible with
|
|
// Action.on(..)
|
|
//
|
|
// XXX this could install the handlers in two locations:
|
|
// - mixin if available...
|
|
// - base object (currently implemented)
|
|
// should the first be done?
|
|
var FeatureProto =
|
|
module.FeatureProto = {
|
|
tag: null,
|
|
|
|
isApplicable: function(actions){
|
|
return true
|
|
},
|
|
|
|
getPriority: function(){
|
|
var res = this.priority || 0
|
|
return res == 'high' ? 99
|
|
: res == 'low' ? -99
|
|
: res == 'medium' ? 0
|
|
: res
|
|
},
|
|
|
|
setup: function(actions){
|
|
var that = this
|
|
|
|
// mixin actions...
|
|
if(this.actions != null){
|
|
actions.mixin(this.actions)
|
|
}
|
|
|
|
// install handlers...
|
|
if(this.handlers != null){
|
|
this.handlers.forEach(function(h){
|
|
actions.on(h[0], that.tag, h[1])
|
|
})
|
|
}
|
|
|
|
// merge config...
|
|
// XXX should this use inheritance???
|
|
if(this.config != null
|
|
|| (this.actions != null
|
|
&& this.actions.config != null)){
|
|
var config = this.config || this.actions.config
|
|
|
|
if(actions.config == null){
|
|
actions.config = {}
|
|
}
|
|
Object.keys(config).forEach(function(n){
|
|
// keep existing keys...
|
|
if(actions.config[n] === undefined){
|
|
actions.config[n] = config[n]
|
|
}
|
|
})
|
|
}
|
|
|
|
// custom setup...
|
|
// XXX is this the correct way???
|
|
if(this.hasOwnProperty('setup') && this.setup !== FeatureProto.setup){
|
|
this.setup(actions)
|
|
}
|
|
|
|
return this
|
|
},
|
|
remove: function(actions){
|
|
if(this.actions != null){
|
|
actions.mixout(this.actions)
|
|
}
|
|
|
|
if(this.handlers != null){
|
|
actions.off('*', this.tag)
|
|
}
|
|
|
|
if(this.hasOwnProperty('remove') && this.setup !== FeatureProto.remove){
|
|
this.remove(actions)
|
|
}
|
|
|
|
// remove feature DOM elements...
|
|
actions.ribbons.viewer.find('.' + this.tag).remove()
|
|
|
|
return this
|
|
},
|
|
}
|
|
|
|
|
|
// XXX is hard-coded default feature-set a good way to go???
|
|
var Feature =
|
|
module.Feature =
|
|
function Feature(feature_set, obj){
|
|
if(obj == null){
|
|
obj = feature_set
|
|
// XXX is this a good default???
|
|
feature_set = Features
|
|
}
|
|
|
|
obj.__proto__ = FeatureProto
|
|
|
|
if(feature_set){
|
|
feature_set[obj.tag] = obj
|
|
}
|
|
|
|
return obj
|
|
}
|
|
Feature.prototype = FeatureProto
|
|
Feature.prototype.constructor = Feature
|
|
|
|
|
|
// XXX experimental...
|
|
// ...not sure if the global feature set is a good idea...
|
|
// XXX if this works out might be a good idea to organize everything as
|
|
// a feature... including the Client and Viewer
|
|
// ...needs more thought...
|
|
var FeatureSet =
|
|
module.FeatureSet = {
|
|
buildFeatureList: function(obj, lst){
|
|
lst = lst.constructor !== Array ? [lst] : lst
|
|
|
|
var that = this
|
|
|
|
// sort features via priority...
|
|
lst = lst.sort(function(a, b){
|
|
a = that[a] == null ? 0 : that[a].getPriority()
|
|
b = that[b] == null ? 0 : that[b].getPriority()
|
|
return b - a
|
|
})
|
|
|
|
// sort features via dependencies...
|
|
var unapplicable = []
|
|
var conflicts = {}
|
|
lst = lst.filter(function(n, i){
|
|
var e = that[n]
|
|
if(e == null){
|
|
return true
|
|
}
|
|
|
|
// check applicability...
|
|
if(!e.isApplicable(obj)){
|
|
unapplicable.push(n)
|
|
return false
|
|
}
|
|
|
|
// no dependencies...
|
|
if(e.depends == null ){
|
|
return true
|
|
}
|
|
|
|
// keep only conflicting...
|
|
var deps = e.depends.filter(function(dep){
|
|
dep = lst.indexOf(dep)
|
|
return dep == -1 || dep > i
|
|
})
|
|
|
|
// no conflicts...
|
|
if(deps.length == 0){
|
|
return true
|
|
}
|
|
|
|
// can't fix...
|
|
conflicts[n] = deps
|
|
|
|
return false
|
|
})
|
|
|
|
// skip duplicate exclusive features...
|
|
var exclusive = []
|
|
var excluded = []
|
|
lst = lst.filter(function(n){
|
|
var e = that[n]
|
|
if(e == null || e.exclusive == null ){
|
|
return true
|
|
}
|
|
// count the number of exclusive features already present...
|
|
var res = e.exclusive
|
|
.filter(function(n){
|
|
if(exclusive.indexOf(n) < 0){
|
|
exclusive.push(n)
|
|
return false
|
|
}
|
|
return true
|
|
})
|
|
.length == 0
|
|
|
|
if(!res){
|
|
excluded.push(n)
|
|
}
|
|
|
|
return res
|
|
})
|
|
|
|
return {
|
|
features: lst,
|
|
excluded: excluded,
|
|
conflicts: conflicts,
|
|
unapplicable: unapplicable,
|
|
}
|
|
},
|
|
|
|
setup: function(obj, lst){
|
|
lst = lst.constructor !== Array ? [lst] : lst
|
|
var features = this.buildFeatureList(obj, lst)
|
|
lst = features.features
|
|
|
|
// check for conflicts...
|
|
if(Object.keys(features.conflicts).length != 0){
|
|
var c = features.conflicts
|
|
|
|
// build a report...
|
|
var report = []
|
|
Object.keys(c).forEach(function(k){
|
|
report.push(k + ': must setup after:\n ' + c[k].join(', '))
|
|
})
|
|
throw 'Feature dependency error:\n ' + report.join('\n ')
|
|
}
|
|
|
|
// report excluded features...
|
|
if(features.excluded.length > 0){
|
|
console.warn('Excluded features due to exclusivity conflict:',
|
|
features.excluded.join(', '))
|
|
}
|
|
|
|
// report unapplicable features...
|
|
if(features.unapplicable.length > 0){
|
|
console.log('Features not applicable in current context:',
|
|
features.unapplicable.join(', '))
|
|
}
|
|
|
|
// do the setup...
|
|
var that = this
|
|
var setup = FeatureProto.setup
|
|
lst.forEach(function(n){
|
|
// setup...
|
|
if(that[n] != null){
|
|
console.log('Setting up feature:', n)
|
|
setup.call(that[n], obj)
|
|
}
|
|
})
|
|
},
|
|
remove: function(obj, lst){
|
|
lst = lst.constructor !== Array ? [lst] : lst
|
|
var that = this
|
|
lst.forEach(function(n){
|
|
if(that[n] != null){
|
|
console.log('Removing feature:', n)
|
|
that[n].remove(obj)
|
|
}
|
|
})
|
|
},
|
|
}
|
|
|
|
|
|
//---------------------------------------------------------------------
|
|
|
|
var Features =
|
|
module.Features = Object.create(FeatureSet)
|
|
|
|
|
|
|
|
/**********************************************************************
|
|
* vim:set ts=4 sw=4 : */
|
|
return module })
|