342 lines
13 KiB
JavaScript
342 lines
13 KiB
JavaScript
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//dojo.provide("lib.CheckBoxTree");
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//dojo.provide("lib.CheckBoxStoreModel");
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// THIS WIDGET IS BASED ON DOJO/DIJIT 1.4.0 AND WILL NOT WORK WITH PREVIOUS VERSIONS
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//
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// Release date: 02/05/2010
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//
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//dojo.require("dijit.Tree");
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//dojo.require("dijit.form.CheckBox");
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define(["dojo/_base/declare", "dijit/tree/TreeStoreModel"], function (declare) {
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return declare( "lib.CheckBoxStoreModel", dijit.tree.TreeStoreModel,
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{
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// checkboxAll: Boolean
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// If true, every node in the tree will receive a checkbox regardless if the 'checkbox' attribute
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// is specified in the dojo.data.
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checkboxAll: true,
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// checkboxState: Boolean
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// The default state applied to every checkbox unless otherwise specified in the dojo.data.
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// (see also: checkboxIdent)
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checkboxState: false,
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// checkboxRoot: Boolean
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// If true, the root node will receive a checkbox eventhough it's not a true entry in the store.
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// This attribute is independent of the showRoot attribute of the tree itself. If the tree
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// attribute 'showRoot' is set to false to checkbox for the root will not show either.
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checkboxRoot: false,
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// checkboxStrict: Boolean
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// If true, a strict parent-child checkbox relation is maintained. For example, if all children
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// are checked the parent will automatically be checked or if any of the children are unchecked
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// the parent will be unchecked.
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checkboxStrict: true,
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// checkboxIdent: String
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// The attribute name (attribute of the dojo.data.item) that specifies that items checkbox initial
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// state. Example: { name:'Egypt', type:'country', checkbox: true }
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// If a dojo.data.item has no 'checkbox' attribute specified it will depend on the attribute
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// 'checkboxAll' if one will be created automatically and if so what the initial state will be as
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// specified by 'checkboxState'.
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checkboxIdent: "checkbox",
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updateCheckbox: function(/*dojo.data.Item*/ storeItem, /*Boolean*/ newState ) {
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// summary:
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// Update the checkbox state (true/false) for the item and the associated parent and
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// child checkboxes if any.
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// description:
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// Update a single checkbox state (true/false) for the item and the associated parent
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// and child checkboxes if any. This function is called from the tree if a user checked
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// or unchecked a checkbox on the tree. The parent and child tree nodes are updated to
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// maintain consistency if 'checkboxStrict' is set to true.
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// storeItem:
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// The item in the dojo.data.store whos checkbox state needs updating.
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// newState:
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// The new state of the checkbox: true or false
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// example:
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// | model.updateCheckboxState(item, true);
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//
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this._setCheckboxState( storeItem, newState );
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//if( this.checkboxStrict ) { I don't need all this 1-1 stuff, only parent -> child (fox)
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this._updateChildCheckbox( storeItem, newState );
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//this._updateParentCheckbox( storeItem, newState );
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//}
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},
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setAllChecked: function(checked) {
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var items = this.store._arrayOfAllItems;
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this.setCheckboxState(items, checked);
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},
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setCheckboxState: function(items, checked) {
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for (var i = 0; i < items.length; i++) {
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this._setCheckboxState(items[i], checked);
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}
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},
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getCheckedItems: function() {
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var items = this.store._arrayOfAllItems;
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var result = [];
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for (var i = 0; i < items.length; i++) {
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if (this.store.getValue(items[i], 'checkbox'))
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result.push(items[i]);
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}
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return result;
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},
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getCheckboxState: function(/*dojo.data.Item*/ storeItem) {
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// summary:
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// Get the current checkbox state from the dojo.data.store.
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// description:
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// Get the current checkbox state from the dojo.data store. A checkbox can have three
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// different states: true, false or undefined. Undefined in this context means no
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// checkbox identifier (checkboxIdent) was found in the dojo.data store. Depending on
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// the checkbox attributes as specified above the following will take place:
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// a) If the current checkbox state is undefined and the checkbox attribute 'checkboxAll' or
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// 'checkboxRoot' is true one will be created and the default state 'checkboxState' will
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// be applied.
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// b) If the current state is undefined and 'checkboxAll' is false the state undefined remains
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// unchanged and is returned. This will prevent any tree node from creating a checkbox.
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//
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// storeItem:
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// The item in the dojo.data.store whos checkbox state is returned.
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// example:
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// | var currState = model.getCheckboxState(item);
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//
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var currState = undefined;
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// Special handling required for the 'fake' root entry (the root is NOT a dojo.data.item).
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// this stuff is only relevant for Forest store -fox
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/* if ( storeItem == this.root ) {
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if( typeof(storeItem.checkbox) == "undefined" ) {
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this.root.checkbox = undefined; // create a new checbox reference as undefined.
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if( this.checkboxRoot ) {
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currState = this.root.checkbox = this.checkboxState;
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}
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} else {
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currState = this.root.checkbox;
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}
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} else { // a valid dojo.store.item
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currState = this.store.getValue(storeItem, this.checkboxIdent);
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if( currState == undefined && this.checkboxAll) {
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this._setCheckboxState( storeItem, this.checkboxState );
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currState = this.checkboxState;
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}
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} */
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currState = this.store.getValue(storeItem, this.checkboxIdent);
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if( currState == undefined && this.checkboxAll) {
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this._setCheckboxState( storeItem, this.checkboxState );
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currState = this.checkboxState;
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}
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return currState; // the current state of the checkbox (true/false or undefined)
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},
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_setCheckboxState: function(/*dojo.data.Item*/ storeItem, /*Boolean*/ newState ) {
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// summary:
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// Set/update the checkbox state on the dojo.data store.
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// description:
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// Set/update the checkbox state on the dojo.data.store. Retreive the current
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// state of the checkbox and validate if an update is required, this will keep
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// update events to a minimum. On completion a 'onCheckboxChange' event is
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// triggered.
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// If the current state is undefined (ie: no checkbox attribute specified for
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// this dojo.data.item) the 'checkboxAll' attribute is checked to see if one
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// needs to be created. In case of the root the 'checkboxRoot' attribute is checked.
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// NOTE: the store.setValue function will create the 'checkbox' attribute for the
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// item if none exists.
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// storeItem:
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// The item in the dojo.data.store whos checkbox state is updated.
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// newState:
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// The new state of the checkbox: true or false
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// example:
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// | model.setCheckboxState(item, true);
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//
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var stateChanged = true;
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if( storeItem != this.root ) {
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var currState = this.store.getValue(storeItem, this.checkboxIdent);
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if( currState != newState && ( currState !== undefined || this.checkboxAll ) ) {
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this.store.setValue(storeItem, this.checkboxIdent, newState);
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} else {
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stateChanged = false; // No changes to the checkbox
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}
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} else { // Tree root instance
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if( this.root.checkbox != newState && ( this.root.checkbox !== undefined || this.checkboxRoot ) ) {
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this.root.checkbox = newState;
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} else {
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stateChanged = false;
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}
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}
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if( stateChanged ) { // In case of any changes trigger the update event.
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this.onCheckboxChange(storeItem);
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}
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return stateChanged;
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},
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_updateChildCheckbox: function(/*dojo.data.Item*/ parentItem, /*Boolean*/ newState ) {
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// summary:
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// Set all child checkboxes to true/false depending on the parent checkbox state.
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// description:
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// If a parent checkbox changes state, all child and grandchild checkboxes will be
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// updated to reflect the change. For example, if the parent state is set to true,
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// all child and grandchild checkboxes will receive that same 'true' state.
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// If a child checkbox changes state and has multiple parent, all of its parents
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// need to be re-evaluated.
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// parentItem:
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// The parent dojo.data.item whos child/grandchild checkboxes require updating.
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// newState:
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// The new state of the checkbox: true or false
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//
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if( this.mayHaveChildren( parentItem )) {
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this.getChildren( parentItem, dojo.hitch( this,
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function( children ) {
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dojo.forEach( children, function(child) {
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if( this._setCheckboxState(child, newState) ) {
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var parents = this._getParentsItem(child);
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if( parents.length > 1 ) {
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this._updateParentCheckbox( child, newState );
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}
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}
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if( this.mayHaveChildren( child )) {
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this._updateChildCheckbox( child, newState );
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}
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}, this );
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}),
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function(err) {
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console.error(this, ": updating child checkboxes: ", err);
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}
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);
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}
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},
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_updateParentCheckbox: function(/*dojo.data.Item*/ storeItem, /*Boolean*/ newState ) {
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// summary:
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// Update the parent checkbox state depending on the state of all child checkboxes.
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// description:
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// Update the parent checkbox state depending on the state of all child checkboxes.
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// The parent checkbox automatically changes state if ALL child checkboxes are true
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// or false. If, as a result, the parent checkbox changes state, we will check if
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// its parent needs to be updated as well all the way upto the root.
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// storeItem:
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// The dojo.data.item whos parent checkboxes require updating.
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// newState:
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// The new state of the checkbox: true or false
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//
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var parents = this._getParentsItem(storeItem);
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dojo.forEach( parents, function( parentItem ) {
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if( newState ) { // new state = true (checked)
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this.getChildren( parentItem, dojo.hitch( this,
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function(siblings) {
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var allChecked = true;
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dojo.some( siblings, function(sibling) {
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siblState = this.getCheckboxState(sibling);
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if( siblState !== undefined && allChecked )
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allChecked = siblState;
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return !(allChecked);
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}, this );
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if( allChecked ) {
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this._setCheckboxState( parentItem, true );
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this._updateParentCheckbox( parentItem, true );
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}
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}),
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function(err) {
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console.error(this, ": updating parent checkboxes: ", err);
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}
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);
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} else { // new state = false (unchecked)
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if( this._setCheckboxState( parentItem, false ) ) {
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this._updateParentCheckbox( parentItem, false );
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}
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}
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}, this );
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},
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_getParentsItem: function(/*dojo.data.Item*/ storeItem ) {
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// summary:
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// Get the parent(s) of a dojo.data item.
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// description:
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// Get the parent(s) of a dojo.data item. The '_reverseRefMap' entry of the item is
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// used to identify the parent(s). A child will have a parent reference if the parent
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// specified the '_reference' attribute.
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// For example: children:[{_reference:'Mexico'}, {_reference:'Canada'}, ...
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// storeItem:
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// The dojo.data.item whos parent(s) will be returned.
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//
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var parents = [];
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if( storeItem != this.root ) {
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var references = storeItem[this.store._reverseRefMap];
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for(itemId in references ) {
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parents.push(this.store._itemsByIdentity[itemId]);
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}
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if (!parents.length) {
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parents.push(this.root);
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}
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}
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return parents; // parent(s) of a dojo.data.item (Array of dojo.data.items)
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},
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validateData: function(/*dojo.data.Item*/ storeItem, /*thisObject*/ scope ) {
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// summary:
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// Validate/normalize the parent(s) checkbox data in the dojo.data store.
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// description:
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// Validate/normalize the parent-child checkbox relationship if the attribute
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// 'checkboxStrict' is set to true. This function is called as part of the post
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// creation of the Tree instance. All parent checkboxes are set to the appropriate
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// state according to the actual state(s) of their children.
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// This will potentionally overwrite whatever was specified for the parent in the
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// dojo.data store. This will garantee the tree is in a consistent state after startup.
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// storeItem:
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// The element to start traversing the dojo.data.store, typically model.root
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// scope:
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// The scope to use when this method executes.
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// example:
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// | this.model.validateData(this.model.root, this.model);
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//
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if( !scope.checkboxStrict ) {
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return;
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}
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scope.getChildren( storeItem, dojo.hitch( scope,
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function(children) {
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var allChecked = true;
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var childState;
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dojo.forEach( children, function( child ) {
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if( this.mayHaveChildren( child )) {
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this.validateData( child, this );
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}
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childState = this.getCheckboxState( child );
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if( childState !== undefined && allChecked )
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allChecked = childState;
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}, this);
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if ( this._setCheckboxState( storeItem, allChecked) ) {
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this._updateParentCheckbox( storeItem, allChecked);
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}
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}),
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function(err) {
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console.error(this, ": validating checkbox data: ", err);
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}
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);
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},
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onCheckboxChange: function(/*dojo.data.Item*/ storeItem ) {
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// summary:
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// Callback whenever a checkbox state has changed state, so that
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// the Tree can update the checkbox. This callback is generally
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// triggered by the '_setCheckboxState' function.
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// tags:
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// callback
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}
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});
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});
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