/** * A mixin that provides the functionality for inheritable configs. This allows linking * components and containers via a prototype-chained object for accessing inherited * values. * * ## Getting Inherited Properties * * A component's inherited state is used to keep track of aspects of a component's state * that might be influenced by its ancestors like "collapsed" and "hidden". For example: * * var hidden = this.getInheritedConfig('hidden'); * * The above will produce `true` if this or any ancestor component has its `hidden` config * set to `true`. * * ## Chained Objects * * Inheritable properties are implemented by chaining each component's inherited state * object to its parent container's inherited state object via the prototype. The result * is such that if a component's `inheritedState` does not have it's own property, it * inherits the property from the nearest ancestor that does. * * In the case of a Container, two state objects are created. The primary ("outer") object * is used for reading inherited properties. It is also what a child will prototype chain * to if that child is not part of the container's `items` collection. Anything in the * `items` collection will chain to the inheritedStateInner object instead. This object is * prototype chained to inheritedState but allows for Container's layout to set inherited * properties that specifically apply only to children of the container. This inner object * is unlikely to be needed by user code. * * ## Publishing Inherited Properties * * The first step to publishing inherited properties is to override `initInheritedState` * and add properties that have inheritable values. * * initInheritedState: function (inheritedState) { * this.callParent(arguments); * * if (this.getHidden()) { * inheritedState.hidden = true; * } * } * * The above is important because `initInheritedState` is called whenever the object needs * to be repopulated. As you can see, only `true` values are added to `inheritedState` in * this case because `false` would mask a `hidden` value of `true` from an ancestor. * * If these values change dynamically, these properties must be maintained. For example: * * updateHidden: function (hidden) { * var inherited = this.getInherited(); * * if (hidden) { * inherited.hidden = true; * } else { * // Unmask whatever may be inherited: * delete inherited.hidden; * } * } * * ## Proper Usage * * ALWAYS access inherited state using `getInherited` or `getInheritedConfig`, not by * accessing `inheritedState` directly. * * The `inheritedState` property does not exist until the first call to `getInherited`. At * that point `getInherited` walks up the component tree to establish the `inheritedState` * prototype chain. Additionally the `inheritedState` property should NOT be relied upon * even after the initial call to `getInherited` because it is possible for it to become * invalid. * * Invalidation typically happens when a component is moved to a new container. In such a * case the `inheritedState` remains invalid until the next time `getInherited` is called * on the component or one of its descendants. * @private * @since 5.0.0 */Ext.define('Ext.mixin.Inheritable', { extend: 'Ext.Mixin', mixinConfig: { id: 'inheritable' }, /** * This method returns an object containing the inherited properties for this instance. * * @param {Boolean} [inner=false] Pass `true` to return `inheritedStateInner` instead * of the normal `inheritedState` object. This is only needed internally and should * not be passed by user code. * * @return {Object} The `inheritedState` object containing inherited properties. * @since 5.0.0 */ getInherited: function (inner) { var me = this, inheritedState = (inner && me.inheritedStateInner) || me.inheritedState, ownerCt = me.getRefOwner(), isContainer = me.isContainer, parent, inheritedStateInner, getInner, ownerLayout; if (!inheritedState || inheritedState.invalid) { // Use upward navigational link, not ownerCt. // 99% of the time, this will use ownerCt/floatParent. // Certain floating components do not have an ownerCt, but they are still linked // into a navigational hierarchy. The getRefOwner method normalizes these differences. parent = me.getRefOwner(); ownerLayout = me.ownerLayout; if (ownerCt) { // For classic, this will only be true if the item is a "child" of its owning container // For example, a docked item will not get the inner inheritedState. // For modern, we currently don't have a decent way of telling the difference // between a child item, or an item that belongs to the component. We may // need to determine this in future, but currently have no use for it. getInner = ownerLayout ? ownerLayout === ownerCt.layout : true; } me.inheritedState = inheritedState = // chain this component's inheritedState to that of its parent. If it // doesn't have a parent, then chain to the rootInheritedState. This is // done so that when there is a viewport, all component's will inherit // from its inheritedState, even components that are not descendants of // the viewport. Ext.Object.chain(parent ? parent.getInherited(getInner) : Ext.rootInheritedState); if (isContainer) { me.inheritedStateInner = inheritedStateInner = Ext.Object.chain(inheritedState); } me.initInheritedState(inheritedState, inheritedStateInner); // initInheritedState is allowed to replace the objects we provide, so we go // back to the instance here at the end. inheritedState = (isContainer && inner) ? me.inheritedStateInner : me.inheritedState; } return inheritedState; }, /** * This method returns the value of a config property that may be inherited from some * ancestor. * * In some cases, a config may be explicitly set on a component with the intent of * *only* being presented to its children while that component should act upon the * inherited value (see `referenceHolder` for example). In these cases the `skipThis` * parameter should be specified as `true`. * * @param {String} property The name of the config property to return. * @param {Boolean} [skipThis=false] Pass `true` if the property should be ignored if * found on this instance. In other words, `true` means the property must be inherited * and not explicitly set on this instance. * @return {Mixed} The value of the requested `property`. * @since 5.0.0 */ getInheritedConfig: function (property, skipThis) { var state = this.inheritedState, old, ret; // Avoid the extra method call since user has already made one to get here if (!state || state.invalid) { state = this.getInherited(); } ret = state[property]; if (skipThis && state.hasOwnProperty(property)) { old = ret; delete state[property]; ret = state[property]; state[property] = old; } return ret; }, /** * Gets the Controller or Component that is used as the event root for this view. * * @param {Object} [defaultScope=this] The default scope to return if none is found. * @param skipThis (private) * @return {Ext.app.ViewController/Ext.container.Container} The default listener scope. * * @protected * @since 5.0.0 */ resolveListenerScope: function (defaultScope, skipThis) { var me = this, hasSkipThis = (typeof skipThis === 'boolean'), namedScope = Ext._namedScopes[defaultScope], ret; if (!namedScope) { // If there is no named scope we know for sure that the listener was not // declared on the class body (i.e. !namedScope.isSelf) and so we can skip // this instance and resolve to defaultListenerScope upward in the hierarchy. // scope: not a named scope so we default to this ret = me.getInheritedConfig('defaultListenerScope', hasSkipThis ? skipThis : true) || defaultScope || me; } else if (namedScope.isController) { // scope:'controller' declared on the class body must include our own // controller before ascending the hierarchy, but scope:'controller' declared // on the instance must skip our own controller and search only for an // inherited controller. ret = me.getInheritedConfig('controller', hasSkipThis ? skipThis : !namedScope.isSelf); } else if (namedScope.isSelf) { // scope:'self' indicates listeners declared on the class body with unspecified // scope. Include this instance when searching for an inherited default scope. ret = me.getInheritedConfig('defaultListenerScope', hasSkipThis && skipThis) || me; } else if (namedScope.isThis) { // scope:'this' always resolves to this instance, regardless of whether the // listener was declared on the class or instance ret = me; } return ret || null; }, /** * Returns the default listener scope for a "satellite" of this component. * Used for resolving scope for observable objects that are not part of the normal * Container/Component hierarchy (for example, plugins) * * @param {Ext.mixin.Observable} satellite * @param {Object} [defaultScope] * @return {Object} The listener scope * @protected * @since 5.1.1 */ resolveSatelliteListenerScope: function(satellite, defaultScope) { var me = this, namedScope = Ext._namedScopes[defaultScope], ret; // The logic here is the same as that in resolveListenerScope with a couple of // exceptions: // 1. If scope resolution failed, fall back to the satellite instance, not "this" // for class-declared listeners, for instance-declared use "this" // 2. Never pass skipThis to getInheritedConfig. The satellite is essentially // treated as a "child" of this component and therefore should always consider // its component/component's controller as candidates for listener scope if (!namedScope) { ret = me.getInheritedConfig('defaultListenerScope') || defaultScope || me; } else if (namedScope.isController) { ret = me.getInheritedConfig('controller'); } else if (namedScope.isSelf) { ret = me.getInheritedConfig('defaultListenerScope') || satellite; } else if (namedScope.isThis) { ret = satellite; } return ret || null; }, /** * Gets the Controller or Component that is used as the reference holder for this view. * * @param {Boolean} [skipThis=true] `false` to return this as the reference holder if * this instance has set `referenceHolder`. Unlike `getInheritedConfig` this method * defaults to `true` because it is possible that a `reference` property set by the * owner of a component that is also a `referenceHolder` itself. In this case, the * `reference` connects not to this component but to the parent referenceHolder. * * @return {Ext.app.ViewController/Ext.container.Container} The reference holder. * * @private * @since 5.0.0 */ lookupReferenceHolder: function (skipThis) { return this.getInheritedConfig('referenceHolder', skipThis !== false) || null; }, /** * Used by {@link Ext.ComponentQuery ComponentQuery}, and the {@link Ext.Component#up up} * method to find the owning Component in the linkage hierarchy. * * By default this returns the Container which contains this Component. * * This may be overridden by Component authors who implement ownership hierarchies * which are not based upon ownerCt, such as BoundLists being owned by Fields or Menus * being owned by Buttons. * @protected */ getRefOwner: function () { var me = this; // Look for both ownerCt (classic toolkit) and parent (modern toolkit) // Look for ownerCmp before floatParent for scenarios like a button menu inside a floating window. return me.ownerCt || me.parent || me.$initParent || me.ownerCmp || me.floatParent; }, /** * This method is called to initialize the `inheritedState` objects for this instance. * This amounts to typically copying certain properties from the instance to the given * object. * * @param {Object} inheritedState The state object for this instance. * @param {Object} [inheritedStateInner] This object is only provided for containers. * @method initInheritedState * @protected * @since 5.0.0 */ /** * This method marks the current inherited state as invalid. The next time a call is * made to `getInherited` the objects will be recreated and initialized. * @private * @since 5.0.0 */ invalidateInheritedState: function () { var inheritedState = this.inheritedState; if (inheritedState) { // if component has a inheritedState at this point we set an invalid flag in // the inheritedState so descendants of this component know to re-initialize // their inheritedState the next time it is requested (see getInherited()) inheritedState.invalid = true; // We can now delete the old inheritedState since it is invalid. IMPORTANT: // the descendants are still linked to the old inheritedState via the // prototype chain, and their inheritedState property will be synced up // the next time their getInherited() method is called. For this reason // inheritedState should always be accessed using getInherited() delete this.inheritedState; } }, privates: { /** * Sets up a reference on our current reference holder. * * @private */ fixReference: function() { var me = this, refHolder; if (me.getReference()) { refHolder = me.lookupReferenceHolder(); if (refHolder) { refHolder.attachReference(me); } } }, /** * Called when this Inheritable is added to a parent * @param {Boolean} instanced */ onInheritedAdd: function(parent, instanced) { var me = this; // The container constructed us, so it's not possible for our // inheritedState to be invalid, so we only need to clear it // if we've been added as an instance if (me.inheritedState && instanced) { me.invalidateInheritedState(); } if (me.getReference()) { Ext.ComponentManager.markReferencesDirty(); } }, /** * Called when this inheritable is removed from a parent * @param {Boolean} destroying `true` if this item will be destroyed by it's container */ onInheritedRemove: function(destroying) { var me = this, refHolder; if (me.getReference()) { refHolder = me.lookupReferenceHolder(); if (refHolder) { refHolder.clearReference(me); } } if (me.inheritedState && !destroying) { me.invalidateInheritedState(); } } }},function () { /** * @property {Object} rootInheritedState * The top level inheritedState to which all other inheritedStates are chained. If * there is a `Viewport` instance, this object becomes the Viewport's inheritedState. * See also {@link Ext.Component#getInherited}. * * @private * @member Ext * @since 5.0.0 */ Ext.rootInheritedState = {};});