262 lines
7.7 KiB
JavaScript
262 lines
7.7 KiB
JavaScript
/*
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Copyright (c) 2004-2011, The Dojo Foundation All Rights Reserved.
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Available via Academic Free License >= 2.1 OR the modified BSD license.
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see: http://dojotoolkit.org/license for details
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*/
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if(!dojo._hasResource["dijit._KeyNavContainer"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dijit._KeyNavContainer"] = true;
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dojo.provide("dijit._KeyNavContainer");
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dojo.require("dijit._Container");
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dojo.declare("dijit._KeyNavContainer",
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dijit._Container,
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{
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// summary:
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// A _Container with keyboard navigation of its children.
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// description:
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// To use this mixin, call connectKeyNavHandlers() in
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// postCreate() and call startupKeyNavChildren() in startup().
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// It provides normalized keyboard and focusing code for Container
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// widgets.
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/*=====
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// focusedChild: [protected] Widget
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// The currently focused child widget, or null if there isn't one
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focusedChild: null,
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=====*/
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// tabIndex: Integer
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// Tab index of the container; same as HTML tabIndex attribute.
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// Note then when user tabs into the container, focus is immediately
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// moved to the first item in the container.
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tabIndex: "0",
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_keyNavCodes: {},
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connectKeyNavHandlers: function(/*dojo.keys[]*/ prevKeyCodes, /*dojo.keys[]*/ nextKeyCodes){
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// summary:
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// Call in postCreate() to attach the keyboard handlers
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// to the container.
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// preKeyCodes: dojo.keys[]
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// Key codes for navigating to the previous child.
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// nextKeyCodes: dojo.keys[]
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// Key codes for navigating to the next child.
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// tags:
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// protected
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var keyCodes = (this._keyNavCodes = {});
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var prev = dojo.hitch(this, this.focusPrev);
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var next = dojo.hitch(this, this.focusNext);
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dojo.forEach(prevKeyCodes, function(code){ keyCodes[code] = prev; });
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dojo.forEach(nextKeyCodes, function(code){ keyCodes[code] = next; });
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keyCodes[dojo.keys.HOME] = dojo.hitch(this, "focusFirstChild");
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keyCodes[dojo.keys.END] = dojo.hitch(this, "focusLastChild");
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this.connect(this.domNode, "onkeypress", "_onContainerKeypress");
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this.connect(this.domNode, "onfocus", "_onContainerFocus");
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},
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startupKeyNavChildren: function(){
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// summary:
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// Call in startup() to set child tabindexes to -1
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// tags:
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// protected
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dojo.forEach(this.getChildren(), dojo.hitch(this, "_startupChild"));
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},
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addChild: function(/*dijit._Widget*/ widget, /*int?*/ insertIndex){
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// summary:
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// Add a child to our _Container
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dijit._KeyNavContainer.superclass.addChild.apply(this, arguments);
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this._startupChild(widget);
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},
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focus: function(){
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// summary:
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// Default focus() implementation: focus the first child.
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this.focusFirstChild();
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},
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focusFirstChild: function(){
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// summary:
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// Focus the first focusable child in the container.
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// tags:
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// protected
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var child = this._getFirstFocusableChild();
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if(child){ // edge case: Menu could be empty or hidden
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this.focusChild(child);
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}
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},
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focusLastChild: function(){
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// summary:
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// Focus the last focusable child in the container.
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// tags:
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// protected
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var child = this._getLastFocusableChild();
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if(child){ // edge case: Menu could be empty or hidden
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this.focusChild(child);
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}
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},
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focusNext: function(){
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// summary:
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// Focus the next widget
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// tags:
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// protected
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var child = this._getNextFocusableChild(this.focusedChild, 1);
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this.focusChild(child);
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},
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focusPrev: function(){
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// summary:
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// Focus the last focusable node in the previous widget
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// (ex: go to the ComboButton icon section rather than button section)
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// tags:
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// protected
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var child = this._getNextFocusableChild(this.focusedChild, -1);
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this.focusChild(child, true);
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},
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focusChild: function(/*dijit._Widget*/ widget, /*Boolean*/ last){
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// summary:
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// Focus widget.
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// widget:
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// Reference to container's child widget
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// last:
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// If true and if widget has multiple focusable nodes, focus the
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// last one instead of the first one
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// tags:
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// protected
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if(this.focusedChild && widget !== this.focusedChild){
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this._onChildBlur(this.focusedChild);
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}
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widget.set("tabIndex", this.tabIndex); // for IE focus outline to appear, must set tabIndex before focs
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widget.focus(last ? "end" : "start");
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this._set("focusedChild", widget);
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},
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_startupChild: function(/*dijit._Widget*/ widget){
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// summary:
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// Setup for each child widget
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// description:
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// Sets tabIndex=-1 on each child, so that the tab key will
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// leave the container rather than visiting each child.
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// tags:
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// private
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widget.set("tabIndex", "-1");
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this.connect(widget, "_onFocus", function(){
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// Set valid tabIndex so tabbing away from widget goes to right place, see #10272
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widget.set("tabIndex", this.tabIndex);
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});
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this.connect(widget, "_onBlur", function(){
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widget.set("tabIndex", "-1");
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});
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},
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_onContainerFocus: function(evt){
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// summary:
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// Handler for when the container gets focus
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// description:
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// Initially the container itself has a tabIndex, but when it gets
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// focus, switch focus to first child...
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// tags:
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// private
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// Note that we can't use _onFocus() because switching focus from the
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// _onFocus() handler confuses the focus.js code
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// (because it causes _onFocusNode() to be called recursively)
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// focus bubbles on Firefox,
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// so just make sure that focus has really gone to the container
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if(evt.target !== this.domNode){ return; }
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this.focusFirstChild();
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// and then set the container's tabIndex to -1,
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// (don't remove as that breaks Safari 4)
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// so that tab or shift-tab will go to the fields after/before
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// the container, rather than the container itself
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dojo.attr(this.domNode, "tabIndex", "-1");
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},
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_onBlur: function(evt){
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// When focus is moved away the container, and its descendant (popup) widgets,
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// then restore the container's tabIndex so that user can tab to it again.
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// Note that using _onBlur() so that this doesn't happen when focus is shifted
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// to one of my child widgets (typically a popup)
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if(this.tabIndex){
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dojo.attr(this.domNode, "tabIndex", this.tabIndex);
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}
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this.inherited(arguments);
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},
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_onContainerKeypress: function(evt){
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// summary:
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// When a key is pressed, if it's an arrow key etc. then
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// it's handled here.
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// tags:
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// private
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if(evt.ctrlKey || evt.altKey){ return; }
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var func = this._keyNavCodes[evt.charOrCode];
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if(func){
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func();
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dojo.stopEvent(evt);
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}
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},
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_onChildBlur: function(/*dijit._Widget*/ widget){
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// summary:
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// Called when focus leaves a child widget to go
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// to a sibling widget.
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// tags:
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// protected
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},
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_getFirstFocusableChild: function(){
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// summary:
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// Returns first child that can be focused
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return this._getNextFocusableChild(null, 1); // dijit._Widget
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},
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_getLastFocusableChild: function(){
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// summary:
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// Returns last child that can be focused
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return this._getNextFocusableChild(null, -1); // dijit._Widget
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},
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_getNextFocusableChild: function(child, dir){
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// summary:
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// Returns the next or previous focusable child, compared
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// to "child"
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// child: Widget
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// The current widget
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// dir: Integer
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// * 1 = after
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// * -1 = before
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if(child){
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child = this._getSiblingOfChild(child, dir);
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}
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var children = this.getChildren();
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for(var i=0; i < children.length; i++){
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if(!child){
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child = children[(dir>0) ? 0 : (children.length-1)];
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}
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if(child.isFocusable()){
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return child; // dijit._Widget
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}
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child = this._getSiblingOfChild(child, dir);
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}
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// no focusable child found
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return null; // dijit._Widget
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}
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}
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);
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}
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