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-
-
- Polymer('core-selector', {
-
- /**
- * Gets or sets the selected element. Default to use the index
- * of the item element.
- *
- * If you want a specific attribute value of the element to be
- * used instead of index, set "valueattr" to that attribute name.
- *
- * Example:
- *
- * <core-selector valueattr="label" selected="foo">
- * <div label="foo"></div>
- * <div label="bar"></div>
- * <div label="zot"></div>
- * </core-selector>
- *
- * In multi-selection this should be an array of values.
- *
- * Example:
- *
- * <core-selector id="selector" valueattr="label" multi>
- * <div label="foo"></div>
- * <div label="bar"></div>
- * <div label="zot"></div>
- * </core-selector>
- *
- * this.$.selector.selected = ['foo', 'zot'];
- *
- * @attribute selected
- * @type Object
- * @default null
- */
- selected: null,
-
- /**
- * If true, multiple selections are allowed.
- *
- * @attribute multi
- * @type boolean
- * @default false
- */
- multi: false,
-
- /**
- * Specifies the attribute to be used for "selected" attribute.
- *
- * @attribute valueattr
- * @type string
- * @default 'name'
- */
- valueattr: 'name',
-
- /**
- * Specifies the CSS class to be used to add to the selected element.
- *
- * @attribute selectedClass
- * @type string
- * @default 'core-selected'
- */
- selectedClass: 'core-selected',
-
- /**
- * Specifies the property to be used to set on the selected element
- * to indicate its active state.
- *
- * @attribute selectedProperty
- * @type string
- * @default ''
- */
- selectedProperty: '',
-
- /**
- * Specifies the attribute to set on the selected element to indicate
- * its active state.
- *
- * @attribute selectedAttribute
- * @type string
- * @default 'active'
- */
- selectedAttribute: 'active',
-
- /**
- * Returns the currently selected element. In multi-selection this returns
- * an array of selected elements.
- * Note that you should not use this to set the selection. Instead use
- * `selected`.
- *
- * @attribute selectedItem
- * @type Object
- * @default null
- */
- selectedItem: null,
-
- /**
- * In single selection, this returns the model associated with the
- * selected element.
- * Note that you should not use this to set the selection. Instead use
- * `selected`.
- *
- * @attribute selectedModel
- * @type Object
- * @default null
- */
- selectedModel: null,
-
- /**
- * In single selection, this returns the selected index.
- * Note that you should not use this to set the selection. Instead use
- * `selected`.
- *
- * @attribute selectedIndex
- * @type number
- * @default -1
- */
- selectedIndex: -1,
-
- /**
- * Nodes with local name that are in the list will not be included
- * in the selection items. In the following example, `items` returns four
- * `core-item`'s and doesn't include `h3` and `hr`.
- *
- * <core-selector excludedLocalNames="h3 hr">
- * <h3>Header</h3>
- * <core-item>Item1</core-item>
- * <core-item>Item2</core-item>
- * <hr>
- * <core-item>Item3</core-item>
- * <core-item>Item4</core-item>
- * </core-selector>
- *
- * @attribute excludedLocalNames
- * @type string
- * @default ''
- */
- excludedLocalNames: '',
-
- /**
- * The target element that contains items. If this is not set
- * core-selector is the container.
- *
- * @attribute target
- * @type Object
- * @default null
- */
- target: null,
-
- /**
- * This can be used to query nodes from the target node to be used for
- * selection items. Note this only works if `target` is set
- * and is not `core-selector` itself.
- *
- * Example:
- *
- * <core-selector target="{{$.myForm}}" itemsSelector="input[type=radio]"></core-selector>
- * <form id="myForm">
- * <label><input type="radio" name="color" value="red"> Red</label> <br>
- * <label><input type="radio" name="color" value="green"> Green</label> <br>
- * <label><input type="radio" name="color" value="blue"> Blue</label> <br>
- * <p>color = {{color}}</p>
- * </form>
- *
- * @attribute itemsSelector
- * @type string
- * @default ''
- */
- itemsSelector: '',
-
- /**
- * The event that would be fired from the item element to indicate
- * it is being selected.
- *
- * @attribute activateEvent
- * @type string
- * @default 'tap'
- */
- activateEvent: 'tap',
-
- /**
- * Set this to true to disallow changing the selection via the
- * `activateEvent`.
- *
- * @attribute notap
- * @type boolean
- * @default false
- */
- notap: false,
-
- defaultExcludedLocalNames: 'template',
-
- observe: {
- 'selected multi': 'selectedChanged'
- },
-
- ready: function() {
- this.activateListener = this.activateHandler.bind(this);
- this.itemFilter = this.filterItem.bind(this);
- this.excludedLocalNamesChanged();
- this.observer = new MutationObserver(this.updateSelected.bind(this));
- if (!this.target) {
- this.target = this;
- }
- },
-
- /**
- * Returns an array of all items.
- *
- * @property items
- */
- get items() {
- if (!this.target) {
- return [];
- }
- var nodes = this.target !== this ? (this.itemsSelector ?
- this.target.querySelectorAll(this.itemsSelector) :
- this.target.children) : this.$.items.getDistributedNodes();
- return Array.prototype.filter.call(nodes, this.itemFilter);
- },
-
- filterItem: function(node) {
- return !this._excludedNames[node.localName];
- },
-
- excludedLocalNamesChanged: function() {
- this._excludedNames = {};
- var s = this.defaultExcludedLocalNames;
- if (this.excludedLocalNames) {
- s += ' ' + this.excludedLocalNames;
- }
- s.split(/\s+/g).forEach(function(n) {
- this._excludedNames[n] = 1;
- }, this);
- },
-
- targetChanged: function(old) {
- if (old) {
- this.removeListener(old);
- this.observer.disconnect();
- this.clearSelection();
- }
- if (this.target) {
- this.addListener(this.target);
- this.observer.observe(this.target, {childList: true});
- this.updateSelected();
- }
- },
-
- addListener: function(node) {
- Polymer.addEventListener(node, this.activateEvent, this.activateListener);
- },
-
- removeListener: function(node) {
- Polymer.removeEventListener(node, this.activateEvent, this.activateListener);
- },
-
- /**
- * Returns the selected item(s). If the `multi` property is true,
- * this will return an array, otherwise it will return
- * the selected item or undefined if there is no selection.
- */
- get selection() {
- return this.$.selection.getSelection();
- },
-
- selectedChanged: function() {
- // TODO(ffu): Right now this is the only way to know that the `selected`
- // is an array and was mutated, as opposed to newly assigned.
- if (arguments.length === 1) {
- this.processSplices(arguments[0]);
- } else {
- this.updateSelected();
- }
- },
-
- updateSelected: function() {
- this.validateSelected();
- if (this.multi) {
- this.clearSelection(this.selected)
- this.selected && this.selected.forEach(function(s) {
- this.setValueSelected(s, true)
- }, this);
- } else {
- this.valueToSelection(this.selected);
- }
- },
-
- validateSelected: function() {
- // convert to an array for multi-selection
- if (this.multi && !Array.isArray(this.selected) &&
- this.selected != null) {
- this.selected = [this.selected];
- // use the first selected in the array for single-selection
- } else if (!this.multi && Array.isArray(this.selected)) {
- var s = this.selected[0];
- this.clearSelection([s]);
- this.selected = s;
- }
- },
-
- processSplices: function(splices) {
- for (var i = 0, splice; splice = splices[i]; i++) {
- for (var j = 0; j < splice.removed.length; j++) {
- this.setValueSelected(splice.removed[j], false);
- }
- for (var j = 0; j < splice.addedCount; j++) {
- this.setValueSelected(this.selected[splice.index + j], true);
- }
- }
- },
-
- clearSelection: function(excludes) {
- this.$.selection.selection.slice().forEach(function(item) {
- var v = this.valueForNode(item) || this.items.indexOf(item);
- if (!excludes || excludes.indexOf(v) < 0) {
- this.$.selection.setItemSelected(item, false);
- }
- }, this);
- },
-
- valueToSelection: function(value) {
- var item = this.valueToItem(value);
- this.$.selection.select(item);
- },
-
- setValueSelected: function(value, isSelected) {
- var item = this.valueToItem(value);
- if (isSelected ^ this.$.selection.isSelected(item)) {
- this.$.selection.setItemSelected(item, isSelected);
- }
- },
-
- updateSelectedItem: function() {
- this.selectedItem = this.selection;
- },
-
- selectedItemChanged: function() {
- if (this.selectedItem) {
- var t = this.selectedItem.templateInstance;
- this.selectedModel = t ? t.model : undefined;
- } else {
- this.selectedModel = null;
- }
- this.selectedIndex = this.selectedItem ?
- parseInt(this.valueToIndex(this.selected)) : -1;
- },
-
- valueToItem: function(value) {
- return (value === null || value === undefined) ?
- null : this.items[this.valueToIndex(value)];
- },
-
- valueToIndex: function(value) {
- // find an item with value == value and return it's index
- for (var i=0, items=this.items, c; (c=items[i]); i++) {
- if (this.valueForNode(c) == value) {
- return i;
- }
- }
- // if no item found, the value itself is probably the index
- return value;
- },
-
- valueForNode: function(node) {
- return node[this.valueattr] || node.getAttribute(this.valueattr);
- },
-
- // events fired from <core-selection> object
- selectionSelect: function(e, detail) {
- this.updateSelectedItem();
- if (detail.item) {
- this.applySelection(detail.item, detail.isSelected);
- }
- },
-
- applySelection: function(item, isSelected) {
- if (this.selectedClass) {
- item.classList.toggle(this.selectedClass, isSelected);
- }
- if (this.selectedProperty) {
- item[this.selectedProperty] = isSelected;
- }
- if (this.selectedAttribute && item.setAttribute) {
- if (isSelected) {
- item.setAttribute(this.selectedAttribute, '');
- } else {
- item.removeAttribute(this.selectedAttribute);
- }
- }
- },
-
- // event fired from host
- activateHandler: function(e) {
- if (!this.notap) {
- var i = this.findDistributedTarget(e.target, this.items);
- if (i >= 0) {
- var item = this.items[i];
- var s = this.valueForNode(item) || i;
- if (this.multi) {
- if (this.selected) {
- this.addRemoveSelected(s);
- } else {
- this.selected = [s];
- }
- } else {
- this.selected = s;
- }
- this.asyncFire('core-activate', {item: item});
- }
- }
- },
-
- addRemoveSelected: function(value) {
- var i = this.selected.indexOf(value);
- if (i >= 0) {
- this.selected.splice(i, 1);
- } else {
- this.selected.push(value);
- }
- },
-
- findDistributedTarget: function(target, nodes) {
- // find first ancestor of target (including itself) that
- // is in nodes, if any
- while (target && target != this) {
- var i = Array.prototype.indexOf.call(nodes, target);
- if (i >= 0) {
- return i;
- }
- target = target.parentNode;
- }
- },
-
- selectIndex: function(index) {
- var item = this.items[index];
- if (item) {
- this.selected = this.valueForNode(item) || index;
- return item;
- }
- },
-
- /**
- * Selects the previous item. This should be used in single selection only.
- *
- * @method selectPrevious
- * @param {boolean} wrapped if true and it is already at the first item,
- * wrap to the end
- * @returns the previous item or undefined if there is none
- */
- selectPrevious: function(wrapped) {
- var i = wrapped && !this.selectedIndex ?
- this.items.length - 1 : this.selectedIndex - 1;
- return this.selectIndex(i);
- },
-
- /**
- * Selects the next item. This should be used in single selection only.
- *
- * @method selectNext
- * @param {boolean} wrapped if true and it is already at the last item,
- * wrap to the front
- * @returns the next item or undefined if there is none
- */
- selectNext: function(wrapped) {
- var i = wrapped && this.selectedIndex >= this.items.length - 1 ?
- 0 : this.selectedIndex + 1;
- return this.selectIndex(i);
- }
-
- });
-