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/* --- Input object --------------------------------------------------------- */
function Input(server,translations,opts) { // Input object constructor
this.server=server;
this.translations=translations;
// Default values for options:
this.options={
delete_button_text: "⌫",
default_source_language: null,
random_button: true,
}
// Apply supplied options
if(opts) for(var o in opts) this.options[o]=opts[o];
// User interface elements
this.main=empty("div");
this.menus=empty("span");
this.buttons=empty("span");
this.surface=div_id("surface");
this.words=div_id("words");
this.from_menu=empty("select");
with(this) {
appendChildren(main,[surface,words]);
appendChildren(menus,[text(" From: "),from_menu])
appendChildren(buttons,
[button(options.delete_button_text,bind(delete_last,this),"H"),
button("Clear",bind(clear_all,this),"L")]);
if(options.random_button)
buttons.appendChild(button("Random",bind(generate_random,this),"R"));
}
/* --- Input client state initialization --- */
this.current={from: null, input: ""};
this.previous=null;
this.from_menu.onchange=bind(this.change_language,this);
}
Input.prototype.change_grammar=function (grammar) {
update_language_menu(this.from_menu,grammar);
set_initial_language(this.options,this.from_menu,grammar);
this.change_language();
}
Input.prototype.change_language=function () {
this.current.from=this.from_menu.value;
this.clear_all();
}
Input.prototype.clear_all1=function() {
with(this) {
remove_typed_input();
current.input="";
previous=null;
surface.innerHTML="";
translations.clear();
}
}
Input.prototype.clear_all=function() {
with(this) {
clear_all1();
get_completions();
}
}
Input.prototype.get_completions=function() {
with(this) {
//debug("get_completions ");
words.innerHTML="...";
server.complete({from:current.from,input:current.input},
bind(show_completions,this));
}
}
Input.prototype.show_completions=function(complete_output) {
with(this) {
//debug("show_completions ");
var completions=complete_output[0].completions;
var emptycnt=add_completions(completions)
if(true/*emptycnt>0*/) translations.translateFrom(current);
else translations.clear();
if(surface.typed && emptycnt==completions.length) {
if(surface.typed.value=="") remove_typed_input();
}
else add_typed_input();
}
}
Input.prototype.add_completions=function(completions) {
with(this) {
if(words.timeout) clearTimeout(words.timeout),words.timeout=null;
words.innerHTML="";
words.completions=completions;
words.word=[];
var t=surface.typed ? surface.typed.value : "";
var emptycnt=0;
for(var i=0;i<completions.length;i++) {
var s=completions[i];
if(s.length>0) {
var w=word(s);
words.appendChild(w);
words.word[i]=w;
}
else emptycnt++;
}
filter_completions(t,true);
return emptycnt;
}
}
Input.prototype.filter_completions=function(t,dim) {
with(this) {
if(words.timeout) clearTimeout(words.timeout),words.timeout=null;
words.filtered=t;
//if(dim) debug('filter "'+t+'"');
var w=words.word;
words.count=0;
var dimmed=0;
var prefix=""; // longest common prefix, for completion
for(var i=0;i<w.length;i++) {
var s=words.completions[i];
var keep=hasPrefix(s,t);
if(keep) {
if(words.count==0) prefix=s;
else prefix=(commonPrefix(prefix,s));
words.count++;
}
if(dim) {
w[i].style.opacity= keep ? "1" : "0.5";
if(keep) w[i].style.display="inline";
else dimmed++;
}
else
w[i].style.display=keep ? "inline" : "none";
}
words.theword=prefix;
if(dimmed>0)
words.timeout=setTimeout(function(){ filter_completions(t,false)},1000);
}
}
Input.prototype.add_typed_input=function() {
with(this) {
if(!surface.typed) {
var inp=empty("input","type","text");
inp.value="";
inp.setAttribute("accesskey","t");
inp.style.width="10em";
inp.onkeyup=bind(complete_typed,this);
surface.appendChild(inp);
surface.typed=inp;
inp.focus();
}
}
}
Input.prototype.remove_typed_input=function() {
with(this) {
if(surface.typed) {
surface.typed.parentNode.removeChild(surface.typed);
surface.typed=null;
}
}
}
Input.prototype.complete_typed=function(event) {
with(this) {
//element("debug").innerHTML=show_props(event,"event");
var inp=surface.typed;
//debug('"'+inp.value+'"');
var s=inp.value;
var ws=s.split(" ");
if(ws.length>1 || event.keyCode==13) {
if(ws[0]!=words.filtered) filter_completions(ws[0],true);
if(words.count==1) add_word(words.theword);
else if(elem(ws[0],words.completions)) add_word(ws[0]);
else if(words.theword.length>ws[0].length) inp.value=words.theword;
}
else if(s!=words.filtered) filter_completions(s,true)
}
}
Input.prototype.generate_random=function() {
var t=this;
function show_random(random) {
t.clear_all1();
t.add_words(random[0].text);
}
function lin_random(abs) {
t.server.linearize({tree:abs[0].tree,to:t.current.from},show_random);
}
t.server.get_random({},lin_random);
}
Input.prototype.add_words=function(s) {
with(this) {
var ws=s.split(" ");
for(var i=0;i<ws.length;i++)
add_word1(ws[i]+" ");
get_completions();
}
}
Input.prototype.word=function(s) {
var t=this;
function click_word() {
if(t.surface.typed) t.surface.typed.value="";
t.add_word(s);
}
return button(s,click_word);
}
Input.prototype.add_word=function(s) {
with(this) {
add_word1(s+" ");
if(surface.typed) {
var s2;
if(hasPrefix(s2=surface.typed.value,s)) {
s2=s2.substr(s.length);
while(s2.length>0 && s2[0]==" ") s2=s2.substr(1);
surface.typed.value=s2;
}
else surface.typed.value="";
}
get_completions();
}
}
Input.prototype.add_word1=function(s) {
with(this) {
previous={ input: current.input, previous: previous };
current.input+=s;
var w=span_class("word",text(s));
if(surface.typed) surface.insertBefore(w,surface.typed);
else surface.appendChild(w);
}
}
Input.prototype.delete_last=function() {
with(this) {
if(surface.typed && surface.typed.value!="")
surface.typed.value="";
else if(previous) {
current.input=previous.input;
previous=previous.previous;
if(surface.typed) {
surface.removeChild(surface.typed.previousSibling);
surface.typed.focus();
}
else surface.removeChild(surface.lastChild);
translations.clear();
get_completions();
}
}
}
/* --- Auxiliary functions -------------------------------------------------- */
function set_initial_language(options,menu,grammar) {
if(grammar.userLanguage) menu.value=grammar.userLanguage;
else if(options.default_source_language) {
for(var i=0;i<menu.options.length;i++) {
var o=menu.options[i].value;
var l=langpart(o,grammar.name);
if(l==options.default_source_language) menu.value=o;
}
}
}
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