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365 lines
13 KiB
JavaScript
365 lines
13 KiB
JavaScript
define("dijit/focus", [
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"dojo/aspect",
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"dojo/_base/declare", // declare
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"dojo/dom", // domAttr.get dom.isDescendant
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"dojo/dom-attr", // domAttr.get dom.isDescendant
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"dojo/dom-construct", // connect to domConstruct.empty, domConstruct.destroy
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"dojo/Evented",
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"dojo/_base/lang", // lang.hitch
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"dojo/on",
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"dojo/ready",
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"dojo/sniff", // has("ie")
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"dojo/Stateful",
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"dojo/_base/unload", // unload.addOnWindowUnload
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"dojo/_base/window", // win.body
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"dojo/window", // winUtils.get
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"./a11y", // a11y.isTabNavigable
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"./registry", // registry.byId
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"./main" // to set dijit.focus
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], function(aspect, declare, dom, domAttr, domConstruct, Evented, lang, on, ready, has, Stateful, unload, win, winUtils,
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a11y, registry, dijit){
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// module:
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// dijit/focus
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var FocusManager = declare([Stateful, Evented], {
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// summary:
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// Tracks the currently focused node, and which widgets are currently "active".
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// Access via require(["dijit/focus"], function(focus){ ... }).
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//
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// A widget is considered active if it or a descendant widget has focus,
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// or if a non-focusable node of this widget or a descendant was recently clicked.
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//
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// Call focus.watch("curNode", callback) to track the current focused DOMNode,
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// or focus.watch("activeStack", callback) to track the currently focused stack of widgets.
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//
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// Call focus.on("widget-blur", func) or focus.on("widget-focus", ...) to monitor when
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// when widgets become active/inactive
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//
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// Finally, focus(node) will focus a node, suppressing errors if the node doesn't exist.
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// curNode: DomNode
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// Currently focused item on screen
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curNode: null,
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// activeStack: dijit/_WidgetBase[]
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// List of currently active widgets (focused widget and it's ancestors)
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activeStack: [],
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constructor: function(){
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// Don't leave curNode/prevNode pointing to bogus elements
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var check = lang.hitch(this, function(node){
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if(dom.isDescendant(this.curNode, node)){
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this.set("curNode", null);
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}
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if(dom.isDescendant(this.prevNode, node)){
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this.set("prevNode", null);
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}
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});
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aspect.before(domConstruct, "empty", check);
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aspect.before(domConstruct, "destroy", check);
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},
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registerIframe: function(/*DomNode*/ iframe){
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// summary:
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// Registers listeners on the specified iframe so that any click
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// or focus event on that iframe (or anything in it) is reported
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// as a focus/click event on the `<iframe>` itself.
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// description:
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// Currently only used by editor.
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// returns:
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// Handle with remove() method to deregister.
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return this.registerWin(iframe.contentWindow, iframe);
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},
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registerWin: function(/*Window?*/targetWindow, /*DomNode?*/ effectiveNode){
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// summary:
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// Registers listeners on the specified window (either the main
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// window or an iframe's window) to detect when the user has clicked somewhere
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// or focused somewhere.
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// description:
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// Users should call registerIframe() instead of this method.
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// targetWindow:
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// If specified this is the window associated with the iframe,
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// i.e. iframe.contentWindow.
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// effectiveNode:
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// If specified, report any focus events inside targetWindow as
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// an event on effectiveNode, rather than on evt.target.
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// returns:
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// Handle with remove() method to deregister.
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// TODO: make this function private in 2.0; Editor/users should call registerIframe(),
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var _this = this;
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var mousedownListener = function(evt){
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_this._justMouseDowned = true;
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setTimeout(function(){ _this._justMouseDowned = false; }, 0);
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// workaround weird IE bug where the click is on an orphaned node
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// (first time clicking a Select/DropDownButton inside a TooltipDialog)
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if(has("ie") && evt && evt.srcElement && evt.srcElement.parentNode == null){
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return;
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}
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_this._onTouchNode(effectiveNode || evt.target || evt.srcElement, "mouse");
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};
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// Listen for blur and focus events on targetWindow's document.
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// Using attachEvent()/addEventListener() rather than on() to try to catch mouseDown events even
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// if other code calls evt.stopPropagation(). But rethink for 2.0 since that doesn't work for attachEvent(),
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// which watches events at the bubbling phase rather than capturing phase, like addEventListener(..., false).
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// Connect to <html> (rather than document) on IE to avoid memory leaks, but document on other browsers because
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// (at least for FF) the focus event doesn't fire on <html> or <body>.
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var doc = has("ie") ? targetWindow.document.documentElement : targetWindow.document;
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if(doc){
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if(has("ie")){
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targetWindow.document.body.attachEvent('onmousedown', mousedownListener);
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var focusinListener = function(evt){
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// IE reports that nodes like <body> have gotten focus, even though they have tabIndex=-1,
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// ignore those events
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var tag = evt.srcElement.tagName.toLowerCase();
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if(tag == "#document" || tag == "body"){ return; }
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// Previous code called _onTouchNode() for any activate event on a non-focusable node. Can
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// probably just ignore such an event as it will be handled by onmousedown handler above, but
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// leaving the code for now.
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if(a11y.isTabNavigable(evt.srcElement)){
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_this._onFocusNode(effectiveNode || evt.srcElement);
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}else{
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_this._onTouchNode(effectiveNode || evt.srcElement);
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}
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};
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doc.attachEvent('onfocusin', focusinListener);
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var focusoutListener = function(evt){
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_this._onBlurNode(effectiveNode || evt.srcElement);
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};
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doc.attachEvent('onfocusout', focusoutListener);
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return {
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remove: function(){
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targetWindow.document.detachEvent('onmousedown', mousedownListener);
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doc.detachEvent('onfocusin', focusinListener);
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doc.detachEvent('onfocusout', focusoutListener);
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doc = null; // prevent memory leak (apparent circular reference via closure)
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}
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};
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}else{
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doc.body.addEventListener('mousedown', mousedownListener, true);
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doc.body.addEventListener('touchstart', mousedownListener, true);
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var focusListener = function(evt){
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_this._onFocusNode(effectiveNode || evt.target);
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};
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doc.addEventListener('focus', focusListener, true);
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var blurListener = function(evt){
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_this._onBlurNode(effectiveNode || evt.target);
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};
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doc.addEventListener('blur', blurListener, true);
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return {
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remove: function(){
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doc.body.removeEventListener('mousedown', mousedownListener, true);
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doc.body.removeEventListener('touchstart', mousedownListener, true);
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doc.removeEventListener('focus', focusListener, true);
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doc.removeEventListener('blur', blurListener, true);
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doc = null; // prevent memory leak (apparent circular reference via closure)
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}
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};
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}
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}
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},
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_onBlurNode: function(/*DomNode*/ node){
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// summary:
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// Called when focus leaves a node.
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// Usually ignored, _unless_ it *isn't* followed by touching another node,
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// which indicates that we tabbed off the last field on the page,
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// in which case every widget is marked inactive
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// If the blur event isn't followed by a focus event, it means the user clicked on something unfocusable,
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// so clear focus.
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if(this._clearFocusTimer){
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clearTimeout(this._clearFocusTimer);
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}
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this._clearFocusTimer = setTimeout(lang.hitch(this, function(){
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this.set("prevNode", this.curNode);
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this.set("curNode", null);
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}), 0);
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if(this._justMouseDowned){
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// the mouse down caused a new widget to be marked as active; this blur event
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// is coming late, so ignore it.
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return;
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}
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// If the blur event isn't followed by a focus or touch event then mark all widgets as inactive.
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if(this._clearActiveWidgetsTimer){
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clearTimeout(this._clearActiveWidgetsTimer);
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}
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this._clearActiveWidgetsTimer = setTimeout(lang.hitch(this, function(){
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delete this._clearActiveWidgetsTimer;
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this._setStack([]);
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}), 0);
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},
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_onTouchNode: function(/*DomNode*/ node, /*String*/ by){
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// summary:
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// Callback when node is focused or mouse-downed
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// node:
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// The node that was touched.
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// by:
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// "mouse" if the focus/touch was caused by a mouse down event
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// ignore the recent blurNode event
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if(this._clearActiveWidgetsTimer){
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clearTimeout(this._clearActiveWidgetsTimer);
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delete this._clearActiveWidgetsTimer;
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}
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// compute stack of active widgets (ex: ComboButton --> Menu --> MenuItem)
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var newStack=[];
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try{
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while(node){
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var popupParent = domAttr.get(node, "dijitPopupParent");
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if(popupParent){
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node=registry.byId(popupParent).domNode;
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}else if(node.tagName && node.tagName.toLowerCase() == "body"){
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// is this the root of the document or just the root of an iframe?
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if(node === win.body()){
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// node is the root of the main document
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break;
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}
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// otherwise, find the iframe this node refers to (can't access it via parentNode,
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// need to do this trick instead). window.frameElement is supported in IE/FF/Webkit
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node=winUtils.get(node.ownerDocument).frameElement;
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}else{
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// if this node is the root node of a widget, then add widget id to stack,
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// except ignore clicks on disabled widgets (actually focusing a disabled widget still works,
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// to support MenuItem)
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var id = node.getAttribute && node.getAttribute("widgetId"),
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widget = id && registry.byId(id);
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if(widget && !(by == "mouse" && widget.get("disabled"))){
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newStack.unshift(id);
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}
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node=node.parentNode;
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}
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}
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}catch(e){ /* squelch */ }
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this._setStack(newStack, by);
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},
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_onFocusNode: function(/*DomNode*/ node){
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// summary:
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// Callback when node is focused
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if(!node){
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return;
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}
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if(node.nodeType == 9){
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// Ignore focus events on the document itself. This is here so that
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// (for example) clicking the up/down arrows of a spinner
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// (which don't get focus) won't cause that widget to blur. (FF issue)
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return;
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}
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// There was probably a blur event right before this event, but since we have a new focus, don't
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// do anything with the blur
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if(this._clearFocusTimer){
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clearTimeout(this._clearFocusTimer);
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delete this._clearFocusTimer;
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}
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this._onTouchNode(node);
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if(node == this.curNode){ return; }
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this.set("prevNode", this.curNode);
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this.set("curNode", node);
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},
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_setStack: function(/*String[]*/ newStack, /*String*/ by){
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// summary:
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// The stack of active widgets has changed. Send out appropriate events and records new stack.
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// newStack:
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// array of widget id's, starting from the top (outermost) widget
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// by:
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// "mouse" if the focus/touch was caused by a mouse down event
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var oldStack = this.activeStack;
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this.set("activeStack", newStack);
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// compare old stack to new stack to see how many elements they have in common
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for(var nCommon=0; nCommon<Math.min(oldStack.length, newStack.length); nCommon++){
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if(oldStack[nCommon] != newStack[nCommon]){
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break;
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}
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}
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var widget;
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// for all elements that have gone out of focus, set focused=false
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for(var i=oldStack.length-1; i>=nCommon; i--){
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widget = registry.byId(oldStack[i]);
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if(widget){
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widget._hasBeenBlurred = true; // TODO: used by form widgets, should be moved there
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widget.set("focused", false);
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if(widget._focusManager == this){
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widget._onBlur(by);
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}
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this.emit("widget-blur", widget, by);
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}
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}
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// for all element that have come into focus, set focused=true
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for(i=nCommon; i<newStack.length; i++){
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widget = registry.byId(newStack[i]);
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if(widget){
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widget.set("focused", true);
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if(widget._focusManager == this){
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widget._onFocus(by);
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}
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this.emit("widget-focus", widget, by);
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}
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}
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},
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focus: function(node){
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// summary:
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// Focus the specified node, suppressing errors if they occur
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if(node){
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try{ node.focus(); }catch(e){/*quiet*/}
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}
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}
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});
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var singleton = new FocusManager();
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// register top window and all the iframes it contains
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ready(function(){
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var handle = singleton.registerWin(winUtils.get(win.doc));
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if(has("ie")){
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unload.addOnWindowUnload(function(){
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if(handle){ // because this gets called twice when doh.robot is running
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handle.remove();
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handle = null;
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}
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});
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}
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});
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// Setup dijit.focus as a pointer to the singleton but also (for backwards compatibility)
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// as a function to set focus. Remove for 2.0.
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dijit.focus = function(node){
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singleton.focus(node); // indirection here allows dijit/_base/focus.js to override behavior
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};
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for(var attr in singleton){
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if(!/^_/.test(attr)){
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dijit.focus[attr] = typeof singleton[attr] == "function" ? lang.hitch(singleton, attr) : singleton[attr];
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}
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}
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singleton.watch(function(attr, oldVal, newVal){
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dijit.focus[attr] = newVal;
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});
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return singleton;
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});
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