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411 lines
17 KiB
Plaintext
411 lines
17 KiB
Plaintext
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "domstubs.idl"
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#include "nsISupports.idl"
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interface nsIAtom;
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interface nsIContent;
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interface nsIXULBuilderListener;
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interface nsIXULTemplateResult;
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interface nsIXULTemplateRuleFilter;
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interface nsIXULTemplateQueryProcessor;
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interface nsIRDFResource;
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interface nsIRDFCompositeDataSource;
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interface nsIDOMDataTransfer;
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/**
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* A template builder, given an input source of data, a template, and a
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* reference point, generates a list of results from the input, and copies
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* part of the template for each result. Templates may generate content
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* recursively, using the same template, but with the previous iteration's
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* results as the reference point. As an example, for an XML datasource the
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* initial reference point would be a specific node in the DOM tree and a
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* template might generate a list of all child nodes. For the next iteration,
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* those children would be used to generate output for their child nodes and
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* so forth.
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*
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* A template builder is attached to a single DOM node; this node is called
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* the root node and is expected to contain a XUL template element as a direct
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* child. Different template builders may be specialized in the manner in
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* which they generate and display the resulting content from the template.
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*
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* The structure of a template is as follows:
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*
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* <rootnode datasources="" ref="">
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* <template>
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* <queryset>
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* <query>
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* </query>
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* <rule>
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* <conditions>...</conditions>
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* <bindings>...</bindings>
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* <action>...</action>
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* </rule>
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* </queryset>
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* </template>
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* </rootnode>
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*
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* The datasources attribute on the root node is used to identify the source
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* of data to be used. The ref attribute is used to specify the reference
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* point for the query. Currently, the datasource will either be an
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* nsIRDFDataSource or a DOM node. In the future, other datasource types may
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* be used.
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*
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* The <queryset> element contains a single query and one or more <rule>
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* elements. There may be more than one <queryset> if multiple queries are
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* desired, and this element is optional if only one query is needed -- in
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* that case the <query> and <rule>s are allowed to be children of the
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* <template> node
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*
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* The contents of the query are processed by a separate component called a
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* query processor. This query processor is expected to use this query to
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* generate results when asked by the template builder. The template builder
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* then generates output for each result based on the <rule> elements.
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*
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* This allows the query processor to be specific to a particular kind of
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* input data or query syntax, while the template builder remains independent
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* of the kind of data being used. Due to this, the query processor will be
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* supplied with the datasource and query which the template builder handles
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* in an opaque way, while the query processor handles these more
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* specifically.
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*
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* Results implement the nsIXULTemplateResult interface and may be identified
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* by an id which must be unique within a given set of query results.
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*
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* Each query may be accompanied by one or more <rule> elements. These rules
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* are evaluated by the template builder for each result produced by the
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* query. A rule consists of conditions that cause a rule to be either
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* accepted or rejected. The condition syntax allows for common conditional
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* handling; additional filtering may be applied by adding a custom filter
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* to a rule with the builder's addRuleFilter method.
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*
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* If a result passes a rule's conditions, this is considered a match, and the
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* content within the rule's <action> body is inserted as a sibling of the
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* <template>, assuming the template builder creates real DOM content. Only
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* one rule will match a result. For a tree builder, for example, the content
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* within the action body is used to create the tree rows instead. A matching
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* result must have its ruleMatched method called. When a result no longer
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* matches, the result's hasBeenRemoved method must be called.
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*
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* Optionally, the rule may have a <bindings> section which may be used to
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* define additional variables to be used within an action body. Each of these
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* declared bindings must be supplied to the query processor via its
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* addBinding method. The bindings are evaluated after a rule has matched.
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*
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* Templates may generate content recursively, using the previous iteration's
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* results as reference point to invoke the same queries. Since the reference
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* point is different, different output will typically be generated.
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*
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* The reference point nsIXULTemplateResult object for the first iteration is
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* determined by calling the query processor's translateRef method using the
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* value of the root node's ref attribute. This object may be retrieved later
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* via the builder's rootResult property.
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*
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* For convenience, each reference point as well as all results implement the
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* nsIXULTemplateResult interface, allowing the result objects from each
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* iteration to be used directly as the reference points for the next
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* iteration.
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*
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* When using multiple queries, each may generate results with the same id.
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* More than one of these results may match one of the rules in their
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* respective queries, however only the result for the earliest matching query
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* in the template becomes the active match and generates output. The
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* addResult, removeResult, replaceResult and resultBindingChanged methods may
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* be called by the query processor to indicate that the set of valid results
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* has changed, such that a different query may match. If a different match
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* would become active, the content for the existing match is removed and the
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* content for the new match is generated. A query processor is not required
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* to provide any support for updating results after they have been generated.
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*
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* See http://wiki.mozilla.org/XUL:Templates_Plan for details about templates.
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*/
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[scriptable, uuid(A583B676-5B02-4F9C-A0C9-CB850CB99818)]
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interface nsIXULTemplateBuilder : nsISupports
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{
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/**
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* The root node in the DOM to which this builder is attached.
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*/
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readonly attribute nsIDOMElement root;
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/**
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* The opaque datasource object that is used for the template. This object
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* is created by the getDataSource method of the query processor. May be
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* null if the datasource has not been loaded yet. Set this attribute to
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* use a different datasource and rebuild the template.
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*
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* For an RDF datasource, this will be the same as the database. For XML
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* this will be the nsIDOMNode for the datasource document or node for
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* an inline reference (such as #name). Other query processors may use
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* other types for the datasource.
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*/
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attribute nsISupports datasource;
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/**
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* The composite datasource that the template builder observes
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* and uses to create content. This is used only for RDF queries and is
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* maintained for backwards compatibility. It will be the same object as
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* the datasource property. For non-RDF queries, it will always be null.
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*/
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readonly attribute nsIRDFCompositeDataSource database;
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/**
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* The virtual result representing the starting reference point,
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* determined by calling the query processor's translateRef method
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* with the root node's ref attribute as an argument.
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*/
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readonly attribute nsIXULTemplateResult rootResult;
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/**
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* The query processor used to generate results.
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*/
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[noscript] readonly attribute nsIXULTemplateQueryProcessor queryProcessor;
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/**
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* Force the template builder to rebuild its content. All existing content
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* will be removed first. The query processor's done() method will be
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* invoked during cleanup, followed by its initializeForBuilding method
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* when the content is to be regenerated.
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*
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*/
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void rebuild();
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/**
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* Reload any of our RDF datasources that support nsIRDFRemoteDatasource.
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*
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* @note This is a temporary hack so that remote-XUL authors can
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* reload remote datasources. When RDF becomes remote-scriptable,
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* this will no longer be necessary.
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*/
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void refresh();
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/**
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* Inform the template builder that a new result is available. The builder
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* will add this result to the set of results. The query node that the
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* new result applies to must be specified using the aQueryNode parameter.
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*
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* The builder will apply the rules associated with the query to the new
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* result, unless a result with the same id from an earlier query
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* supersedes it, and the result's RuleMatched method will be called if it
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* matches.
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*
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* @param aResult the result to add
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* @param aQueryNode the query that the result applies to
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*
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* @throws NS_ERROR_NULL_POINTER if aResult or aQueryNode are null
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*/
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void addResult(in nsIXULTemplateResult aResult, in nsIDOMNode aQueryNode);
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/**
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* Inform the template builder that a result no longer applies. The builder
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* will call the remove content generated for the result, if any. If a different
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* query would then match instead, it will become the active match. This
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* method will have no effect if the result isn't known to the builder.
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*
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* @param aResult the result to remove
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*
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* @throws NS_ERROR_NULL_POINTER if aResult is null
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*/
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void removeResult(in nsIXULTemplateResult aResult);
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/**
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* Inform the template builder that one result should be replaced with
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* another. Both the old result (aOldResult) and the new result
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* (aNewResult) must have the same id. The query node that the new result
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* applies to must be specified using the aQueryNode parameter.
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*
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* This method is expected to have the same effect as calling both
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* removeResult for the old result and addResult for the new result.
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*
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* @param aOldResult the old result
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* @param aNewResult the new result
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* @param aQueryNode the query that the new result applies to
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*
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* @throws NS_ERROR_NULL_POINTER if either argument is null, or
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* NS_ERROR_INVALID_ARG if the ids don't match
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*/
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void replaceResult(in nsIXULTemplateResult aOldResult,
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in nsIXULTemplateResult aNewResult,
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in nsIDOMNode aQueryNode);
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/**
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* Inform the template builder that one or more of the optional bindings
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* for a result has changed. In this case, the rules are not reapplied as
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* it is expected that the same rule will still apply. The builder will
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* resynchronize any variables that are referenced in the action body.
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*
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* @param aResult the result to change
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*
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* @throws NS_ERROR_NULL_POINTER if aResult is null
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*/
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void resultBindingChanged(in nsIXULTemplateResult aResult);
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/**
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* Return the result for a given id. Only one such result is returned and
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* is always the result with that id associated with the active match.
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* This method will return null is there is no result for the id.
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*
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* @param aId the id to return the result for
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*/
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nsIXULTemplateResult getResultForId(in AString aId);
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/**
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* Retrieve the result corresponding to a generated element, or null is
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* there isn't one.
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*
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* @param aContent element to result the result of
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*/
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nsIXULTemplateResult getResultForContent(in nsIDOMElement aElement);
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/**
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* Returns true if the node has content generated for it. This method is
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* intended to be called only by the RDF query processor. If aTag is set,
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* the content must have a tag name that matches aTag. aTag may be ignored
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* for builders that don't generate real DOM content.
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*
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* @param aNode node to check
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* @param aTag tag that must match
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*/
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boolean hasGeneratedContent(in nsIRDFResource aNode, in nsIAtom aTag);
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/**
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* Adds a rule filter for a given rule, which may be used for specialized
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* rule filtering. Any existing filter on the rule is removed. The default
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* conditions specified inside the <rule> tag are applied before the
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* rule filter is applied, meaning that the filter may be used to further
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* filter out results but not reaccept results that have already been
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* rejected.
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*
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* @param aRule the rule to apply the filter to
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* @param aFilter the filter to add
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*/
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void addRuleFilter(in nsIDOMNode aRule, in nsIXULTemplateRuleFilter aFilter);
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/**
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* Called to initialize a XUL content builder on a particular root
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* element. This element presumably has a ``datasources''
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* attribute, which the builder will parse to set up the template
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* builder's datasources.
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*/
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[noscript] void init(in nsIContent aElement);
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/**
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* Invoked lazily by a XUL element that needs its child content built.
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* If aForceCreation is true, then the contents of an element will be
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* generated even if it is closed. If false, the element will only
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* generate its contents if it is open. This behaviour is used with menus.
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*/
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[noscript] void createContents(in nsIContent aElement,
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in boolean aForceCreation);
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/**
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* Add a listener to this template builder. The template builder
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* holds a strong reference to the listener.
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*/
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void addListener(in nsIXULBuilderListener aListener);
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/**
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* Remove a listener from this template builder.
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*/
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void removeListener(in nsIXULBuilderListener aListener);
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};
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/**
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* nsIXULTreeBuilderObserver
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* This interface allows clients of the XULTreeBuilder to define domain
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* specific handling of specific nsITreeView methods that
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* XULTreeBuilder does not implement.
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*/
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[scriptable, uuid(57CED9A7-EC0B-4A0E-8AEB-5DA32EBE951C)]
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interface nsIXULTreeBuilderObserver : nsISupports
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{
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const long DROP_BEFORE = -1;
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const long DROP_ON = 0;
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const long DROP_AFTER = 1;
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/**
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* Methods used by the drag feedback code to determine if a drag is allowable at
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* the current location. To get the behavior where drops are only allowed on
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* items, such as the mailNews folder pane, always return false whe
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* the orientation is not DROP_ON.
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*/
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boolean canDrop(in long index, in long orientation, in nsIDOMDataTransfer dataTransfer);
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/**
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* Called when the user drops something on this view. The |orientation| param
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* specifies before/on/after the given |row|.
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*/
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void onDrop(in long row, in long orientation, in nsIDOMDataTransfer dataTransfer);
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/**
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* Called when an item is opened or closed.
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*/
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void onToggleOpenState (in long index);
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/**
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* Called when a header is clicked.
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*/
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void onCycleHeader(in wstring colID, in nsIDOMElement elt);
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/**
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* Called when a cell in a non-selectable cycling column (e.g.
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* unread/flag/etc.) is clicked.
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*/
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void onCycleCell(in long row, in wstring colID);
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/**
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* Called when selection in the tree changes
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*/
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void onSelectionChanged();
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/**
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* A command API that can be used to invoke commands on the selection.
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* The tree will automatically invoke this method when certain keys
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* are pressed. For example, when the DEL key is pressed, performAction
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* will be called with the "delete" string.
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*/
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void onPerformAction(in wstring action);
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/**
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* A command API that can be used to invoke commands on a specific row.
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*/
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void onPerformActionOnRow(in wstring action, in long row);
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/**
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* A command API that can be used to invoke commands on a specific cell.
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*/
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void onPerformActionOnCell(in wstring action, in long row, in wstring colID);
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};
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[scriptable, uuid(06b31b15-ebf5-4e74-a0e2-6bc0a18a3969)]
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interface nsIXULTreeBuilder : nsISupports
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{
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/**
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* Retrieve the RDF resource associated with the specified row.
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*/
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nsIRDFResource getResourceAtIndex(in long aRowIndex);
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/**
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* Retrieve the index associated with specified RDF resource.
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*/
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long getIndexOfResource(in nsIRDFResource resource);
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/**
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* Add a Tree Builder Observer to handle Tree View
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* methods that the base builder does not implement.
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*/
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void addObserver(in nsIXULTreeBuilderObserver aObserver);
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/**
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* Remove an Tree Builder Observer.
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*/
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void removeObserver(in nsIXULTreeBuilderObserver aObserver);
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/**
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* Sort the contents of the tree using the specified column.
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*/
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void sort(in nsIDOMElement aColumnElement);
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};
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