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375 lines
13 KiB
JavaScript
375 lines
13 KiB
JavaScript
define("dojo/_base/connect", ["./kernel", "../on", "../topic", "../aspect", "./event", "../mouse", "./sniff", "./lang", "../keys"], function(dojo, on, hub, aspect, eventModule, mouse, has, lang){
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// module:
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// dojo/_base/connect
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has.add("events-keypress-typed", function(){ // keypresses should only occur a printable character is hit
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var testKeyEvent = {charCode: 0};
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try{
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testKeyEvent = document.createEvent("KeyboardEvent");
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(testKeyEvent.initKeyboardEvent || testKeyEvent.initKeyEvent).call(testKeyEvent, "keypress", true, true, null, false, false, false, false, 9, 3);
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}catch(e){}
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return testKeyEvent.charCode == 0 && !has("opera");
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});
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function connect_(obj, event, context, method, dontFix){
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method = lang.hitch(context, method);
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if(!obj || !(obj.addEventListener || obj.attachEvent)){
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// it is a not a DOM node and we are using the dojo.connect style of treating a
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// method like an event, must go right to aspect
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return aspect.after(obj || dojo.global, event, method, true);
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}
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if(typeof event == "string" && event.substring(0, 2) == "on"){
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event = event.substring(2);
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}
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if(!obj){
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obj = dojo.global;
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}
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if(!dontFix){
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switch(event){
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// dojo.connect has special handling for these event types
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case "keypress":
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event = keypress;
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break;
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case "mouseenter":
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event = mouse.enter;
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break;
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case "mouseleave":
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event = mouse.leave;
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break;
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}
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}
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return on(obj, event, method, dontFix);
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}
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var _punctMap = {
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106:42,
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111:47,
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186:59,
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187:43,
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188:44,
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189:45,
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190:46,
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191:47,
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192:96,
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219:91,
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220:92,
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221:93,
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222:39,
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229:113
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};
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var evtCopyKey = has("mac") ? "metaKey" : "ctrlKey";
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var _synthesizeEvent = function(evt, props){
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var faux = lang.mixin({}, evt, props);
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setKeyChar(faux);
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// FIXME: would prefer to use lang.hitch: lang.hitch(evt, evt.preventDefault);
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// but it throws an error when preventDefault is invoked on Safari
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// does Event.preventDefault not support "apply" on Safari?
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faux.preventDefault = function(){ evt.preventDefault(); };
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faux.stopPropagation = function(){ evt.stopPropagation(); };
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return faux;
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};
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function setKeyChar(evt){
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evt.keyChar = evt.charCode ? String.fromCharCode(evt.charCode) : '';
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evt.charOrCode = evt.keyChar || evt.keyCode;
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}
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var keypress;
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if(has("events-keypress-typed")){
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// this emulates Firefox's keypress behavior where every keydown can correspond to a keypress
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var _trySetKeyCode = function(e, code){
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try{
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// squelch errors when keyCode is read-only
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// (e.g. if keyCode is ctrl or shift)
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return (e.keyCode = code);
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}catch(e){
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return 0;
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}
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};
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keypress = function(object, listener){
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var keydownSignal = on(object, "keydown", function(evt){
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// munge key/charCode
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var k=evt.keyCode;
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// These are Windows Virtual Key Codes
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// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/WinUI/WindowsUserInterface/UserInput/VirtualKeyCodes.asp
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var unprintable = (k!=13) && k!=32 && (k!=27||!has("ie")) && (k<48||k>90) && (k<96||k>111) && (k<186||k>192) && (k<219||k>222) && k!=229;
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// synthesize keypress for most unprintables and CTRL-keys
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if(unprintable||evt.ctrlKey){
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var c = unprintable ? 0 : k;
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if(evt.ctrlKey){
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if(k==3 || k==13){
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return listener.call(evt.currentTarget, evt); // IE will post CTRL-BREAK, CTRL-ENTER as keypress natively
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}else if(c>95 && c<106){
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c -= 48; // map CTRL-[numpad 0-9] to ASCII
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}else if((!evt.shiftKey)&&(c>=65&&c<=90)){
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c += 32; // map CTRL-[A-Z] to lowercase
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}else{
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c = _punctMap[c] || c; // map other problematic CTRL combinations to ASCII
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}
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}
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// simulate a keypress event
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var faux = _synthesizeEvent(evt, {type: 'keypress', faux: true, charCode: c});
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listener.call(evt.currentTarget, faux);
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if(has("ie")){
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_trySetKeyCode(evt, faux.keyCode);
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}
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}
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});
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var keypressSignal = on(object, "keypress", function(evt){
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var c = evt.charCode;
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c = c>=32 ? c : 0;
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evt = _synthesizeEvent(evt, {charCode: c, faux: true});
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return listener.call(this, evt);
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});
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return {
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remove: function(){
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keydownSignal.remove();
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keypressSignal.remove();
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}
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};
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};
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}else{
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if(has("opera")){
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keypress = function(object, listener){
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return on(object, "keypress", function(evt){
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var c = evt.which;
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if(c==3){
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c=99; // Mozilla maps CTRL-BREAK to CTRL-c
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}
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// can't trap some keys at all, like INSERT and DELETE
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// there is no differentiating info between DELETE and ".", or INSERT and "-"
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c = c<32 && !evt.shiftKey ? 0 : c;
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if(evt.ctrlKey && !evt.shiftKey && c>=65 && c<=90){
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// lowercase CTRL-[A-Z] keys
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c += 32;
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}
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return listener.call(this, _synthesizeEvent(evt, { charCode: c }));
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});
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};
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}else{
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keypress = function(object, listener){
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return on(object, "keypress", function(evt){
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setKeyChar(evt);
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return listener.call(this, evt);
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});
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};
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}
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}
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var connect = {
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// summary:
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// This module defines the dojo.connect API.
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// This modules also provides keyboard event handling helpers.
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// This module exports an extension event for emulating Firefox's keypress handling.
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// However, this extension event exists primarily for backwards compatibility and
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// is not recommended. WebKit and IE uses an alternate keypress handling (only
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// firing for printable characters, to distinguish from keydown events), and most
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// consider the WebKit/IE behavior more desirable.
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_keypress:keypress,
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connect:function(obj, event, context, method, dontFix){
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// summary:
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// `dojo.connect` is a deprecated event handling and delegation method in
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// Dojo. It allows one function to "listen in" on the execution of
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// any other, triggering the second whenever the first is called. Many
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// listeners may be attached to a function, and source functions may
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// be either regular function calls or DOM events.
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//
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// description:
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// Connects listeners to actions, so that after event fires, a
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// listener is called with the same arguments passed to the original
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// function.
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//
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// Since `dojo.connect` allows the source of events to be either a
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// "regular" JavaScript function or a DOM event, it provides a uniform
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// interface for listening to all the types of events that an
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// application is likely to deal with though a single, unified
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// interface. DOM programmers may want to think of it as
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// "addEventListener for everything and anything".
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//
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// When setting up a connection, the `event` parameter must be a
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// string that is the name of the method/event to be listened for. If
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// `obj` is null, `kernel.global` is assumed, meaning that connections
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// to global methods are supported but also that you may inadvertently
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// connect to a global by passing an incorrect object name or invalid
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// reference.
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//
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// `dojo.connect` generally is forgiving. If you pass the name of a
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// function or method that does not yet exist on `obj`, connect will
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// not fail, but will instead set up a stub method. Similarly, null
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// arguments may simply be omitted such that fewer than 4 arguments
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// may be required to set up a connection See the examples for details.
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//
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// The return value is a handle that is needed to
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// remove this connection with `dojo.disconnect`.
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//
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// obj: Object?
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// The source object for the event function.
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// Defaults to `kernel.global` if null.
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// If obj is a DOM node, the connection is delegated
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// to the DOM event manager (unless dontFix is true).
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//
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// event: String
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// String name of the event function in obj.
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// I.e. identifies a property `obj[event]`.
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//
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// context: Object|null
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// The object that method will receive as "this".
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//
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// If context is null and method is a function, then method
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// inherits the context of event.
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//
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// If method is a string then context must be the source
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// object object for method (context[method]). If context is null,
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// kernel.global is used.
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//
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// method: String|Function
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// A function reference, or name of a function in context.
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// The function identified by method fires after event does.
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// method receives the same arguments as the event.
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// See context argument comments for information on method's scope.
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//
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// dontFix: Boolean?
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// If obj is a DOM node, set dontFix to true to prevent delegation
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// of this connection to the DOM event manager.
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//
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// example:
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// When obj.onchange(), do ui.update():
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// | dojo.connect(obj, "onchange", ui, "update");
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// | dojo.connect(obj, "onchange", ui, ui.update); // same
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//
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// example:
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// Using return value for disconnect:
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// | var link = dojo.connect(obj, "onchange", ui, "update");
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// | ...
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// | dojo.disconnect(link);
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//
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// example:
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// When onglobalevent executes, watcher.handler is invoked:
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// | dojo.connect(null, "onglobalevent", watcher, "handler");
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//
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// example:
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// When ob.onCustomEvent executes, customEventHandler is invoked:
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// | dojo.connect(ob, "onCustomEvent", null, "customEventHandler");
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// | dojo.connect(ob, "onCustomEvent", "customEventHandler"); // same
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//
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// example:
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// When ob.onCustomEvent executes, customEventHandler is invoked
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// with the same scope (this):
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// | dojo.connect(ob, "onCustomEvent", null, customEventHandler);
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// | dojo.connect(ob, "onCustomEvent", customEventHandler); // same
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//
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// example:
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// When globalEvent executes, globalHandler is invoked
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// with the same scope (this):
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// | dojo.connect(null, "globalEvent", null, globalHandler);
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// | dojo.connect("globalEvent", globalHandler); // same
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// normalize arguments
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var a=arguments, args=[], i=0;
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// if a[0] is a String, obj was omitted
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args.push(typeof a[0] == "string" ? null : a[i++], a[i++]);
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// if the arg-after-next is a String or Function, context was NOT omitted
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var a1 = a[i+1];
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args.push(typeof a1 == "string" || typeof a1 == "function" ? a[i++] : null, a[i++]);
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// absorb any additional arguments
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for(var l=a.length; i<l; i++){ args.push(a[i]); }
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return connect_.apply(this, args);
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},
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disconnect:function(handle){
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// summary:
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// Remove a link created by dojo.connect.
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// description:
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// Removes the connection between event and the method referenced by handle.
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// handle: Handle
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// the return value of the dojo.connect call that created the connection.
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if(handle){
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handle.remove();
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}
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},
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subscribe:function(topic, context, method){
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// summary:
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// Attach a listener to a named topic. The listener function is invoked whenever the
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// named topic is published (see: dojo.publish).
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// Returns a handle which is needed to unsubscribe this listener.
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// topic: String
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// The topic to which to subscribe.
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// context: Object?
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// Scope in which method will be invoked, or null for default scope.
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// method: String|Function
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// The name of a function in context, or a function reference. This is the function that
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// is invoked when topic is published.
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// example:
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// | dojo.subscribe("alerts", null, function(caption, message){ alert(caption + "\n" + message); });
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// | dojo.publish("alerts", [ "read this", "hello world" ]);
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return hub.subscribe(topic, lang.hitch(context, method));
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},
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publish:function(topic, args){
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// summary:
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// Invoke all listener method subscribed to topic.
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// topic: String
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// The name of the topic to publish.
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// args: Array?
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// An array of arguments. The arguments will be applied
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// to each topic subscriber (as first class parameters, via apply).
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// example:
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// | dojo.subscribe("alerts", null, function(caption, message){ alert(caption + "\n" + message); };
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// | dojo.publish("alerts", [ "read this", "hello world" ]);
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return hub.publish.apply(hub, [topic].concat(args));
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},
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connectPublisher:function(topic, obj, event){
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// summary:
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// Ensure that every time obj.event() is called, a message is published
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// on the topic. Returns a handle which can be passed to
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// dojo.disconnect() to disable subsequent automatic publication on
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// the topic.
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// topic: String
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// The name of the topic to publish.
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// obj: Object?
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// The source object for the event function. Defaults to kernel.global
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// if null.
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// event: String
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// The name of the event function in obj.
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// I.e. identifies a property obj[event].
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// example:
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// | dojo.connectPublisher("/ajax/start", dojo, "xhrGet");
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var pf = function(){ connect.publish(topic, arguments); };
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return event ? connect.connect(obj, event, pf) : connect.connect(obj, pf); //Handle
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},
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isCopyKey: function(e){
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// summary:
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// Checks an event for the copy key (meta on Mac, and ctrl anywhere else)
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// e: Event
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// Event object to examine
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return e[evtCopyKey]; // Boolean
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}
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};
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connect.unsubscribe = connect.disconnect;
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/*=====
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connect.unsubscribe = function(handle){
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// summary:
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// Remove a topic listener.
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// handle: Handle
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// The handle returned from a call to subscribe.
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// example:
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// | var alerter = dojo.subscribe("alerts", null, function(caption, message){ alert(caption + "\n" + message); };
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// | ...
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// | dojo.unsubscribe(alerter);
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};
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=====*/
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1 && lang.mixin(dojo, connect);
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return connect;
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});
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