SelectionModel¶
-
class
webix.SelectionModel()¶ Selectionmodel mixin
Referenced by¶
- views
dataview(),list(),tree().
External references¶
Code¶
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$init:function(){
//collection of selected IDs
this._selected = webix.toArray();
webix.assert(this.data, "SelectionModel :: Component doesn't have DataStore");
//remove selection from deleted items
this.data.attachEvent("onStoreUpdated",webix.bind(this._data_updated,this));
this.data.attachEvent("onStoreLoad", webix.bind(this._data_loaded,this));
this.data.attachEvent("onAfterFilter", webix.bind(this._data_filtered,this));
this.data.attachEvent("onIdChange", webix.bind(this._id_changed,this));
this.$ready.push(this._set_noselect);
},
_set_noselect: function(){
if (this._settings.select=="multiselect" || this._settings.multiselect)
webix._event(this.$view,"mousedown", function(e){
var shiftKey = (e||event).shiftKey;
if(shiftKey){
webix._noselect_element = this;
webix.html.addCss(this,"webix_noselect",1);
}
});
},
_id_changed:function(oldid, newid){
for (var i = this._selected.length - 1; i >= 0; i--)
if (this._selected[i]==oldid)
this._selected[i]=newid;
},
_data_filtered:function(){
for (var i = this._selected.length - 1; i >= 0; i--){
if (this.data.getIndexById(this._selected[i]) < 0) {
var id = this._selected[i];
this.removeCss(id, "webix_selected", true);
this._selected.splice(i,1);
this.callEvent("onSelectChange",[id]);
}
}
},
//helper - linked to onStoreUpdated
_data_updated:function(id,obj,type){
if (type == "delete"){ //remove selection from deleted items
if (this.loadBranch){
//hierarchy, need to check all
for (var i = this._selected.length - 1; i >= 0; i--)
if (!this.exists(this._selected[i]))
this._selected.splice(i,1);
} else
this._selected.remove(id);
}
else if (!id && !this.data.count() && !this.data._filter_order){ //remove selection for clearAll
this._selected = webix.toArray();
}
},
_data_loaded:function(){
if (this._settings.select)
this.data.each(function(obj){
if (obj && obj.$selected) this.select(obj.id);
}, this);
},
//helper - changes state of selection for some item
_select_mark:function(id,state,refresh,need_unselect){
var name = state ? "onBeforeSelect" : "onBeforeUnSelect";
if (!this.callEvent(name,[id,state])) return false;
if (need_unselect){
this._silent_selection = true;
this.unselectAll();
this._silent_selection = false;
}
if (state)
this.addCss(id, "webix_selected", true);
else
this.removeCss(id, "webix_selected", true);
if (refresh)
refresh.push(id); //if we in the mass-select mode - collect all changed IDs
else{
if (state)
this._selected.push(id); //then add to list of selected items
else
this._selected.remove(id);
this._refresh_selection(id); //othervise trigger repainting
}
var name = state ? "onAfterSelect" : "onAfterUnSelect";
this.callEvent(name,[id]);
return true;
},
//select some item
select:function(id,preserve){
var ctrlKey = arguments[2];
var shiftKey = arguments[3];
//if id not provide - works as selectAll
if (!id) return this.selectAll();
//allow an array of ids as parameter
if (webix.isArray(id)){
for (var i=0; i < id.length; i++)
this.select(id[i], (i?1:preserve), ctrlKey, shiftKey);
return;
}
webix.assert(this.data.exists(id), "Incorrect id in select command: "+id);
//block selection mode
if (shiftKey && this._selected.length)
return this.selectAll(this._selected[this._selected.length-1],id);
//single selection mode
var need_unselect = false;
if (!ctrlKey && !preserve && (this._selected.length!=1 || this._selected[0]!=id))
need_unselect = true;
if (!need_unselect && this.isSelected(id)){
if (ctrlKey) this.unselect(id); //ctrl-selection of already selected item
return;
}
this._select_mark(id, true, null, need_unselect);
},
//unselect some item
unselect:function(id){
//if id is not provided - unselect all items
if (!id) return this.unselectAll();
if (!this.isSelected(id)) return;
this._select_mark(id,false);
},
//select all items, or all in defined range
selectAll:function(from,to){
var range;
var refresh=[];
if (from||to)
range = this.data.getRange(from||null,to||null); //get limited set if bounds defined
else
range = this.data.getRange(); //get all items in other case
//in case of paging - it will be current page only
range.each(function(obj){
if (!this.data.getMark(obj.id, "webix_selected")){
this._selected.push(obj.id);
this._select_mark(obj.id,true,refresh);
}
},this);
//repaint self
this._refresh_selection(refresh);
},
//remove selection from all items
unselectAll:function(){
var refresh=[];
this._selected.each(function(id){
this._select_mark(id,false,refresh); //unmark selected only
},this);
this._selected=webix.toArray();
this._refresh_selection(refresh); //repaint self
},
//returns true if item is selected
isSelected:function(id){
return this._selected.find(id)!=-1;
},
/*
returns ID of selected items or array of IDs
to make result predictable - as_array can be used,
with such flag command will always return an array
empty array in case when no item was selected
*/
getSelectedId:function(as_array){
switch(this._selected.length){
case 0: return as_array?[]:"";
case 1: return as_array?[this._selected[0]]:this._selected[0];
default: return ([].concat(this._selected)); //isolation
}
},
getSelectedItem:function(as_array){
var sel = this.getSelectedId(true);
if (sel.length > 1 || as_array){
for (var i = sel.length - 1; i >= 0; i--)
sel[i] = this.getItem(sel[i]);
return sel;
} else if (sel.length)
return this.getItem(sel[0]);
},
//detects which repainting mode need to be used
_is_mass_selection:function(obj){
// crappy heuristic, but will do the job
return obj.length>100 || obj.length > this.data.count/2;
},
_refresh_selection:function(refresh){
if (typeof refresh != "object") refresh = [refresh];
if (!refresh.length) return; //nothing to repaint
if (this._is_mass_selection(refresh))
this.data.refresh(); //many items was selected - repaint whole view
else
for (var i=0; i < refresh.length; i++) //repaint only selected
this.render(refresh[i],this.data.getItem(refresh[i]),"update");
if (!this._silent_selection)
this.callEvent("onSelectChange",[refresh]);
}
};
webix.ready(function(){
webix.event(document.body,"mouseup", function(e){
if(webix._noselect_element){
webix.html.removeCss(webix._noselect_element,"webix_noselect");
webix._noselect_element = null;
}
});
});
/*
Behavior:DataMove - allows to move and copy elements, heavily relays on DataStore.move
@export
copy
move
*/
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