gecko/b2g/chrome/content/forms.js

246 lines
7.1 KiB
JavaScript

/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
dump("###################################### forms.js loaded\n");
"use strict";
let Ci = Components.interfaces;
let Cc = Components.classes;
let Cu = Components.utils;
Cu.import("resource://gre/modules/Services.jsm");
Cu.import('resource://gre/modules/XPCOMUtils.jsm');
XPCOMUtils.defineLazyServiceGetter(Services, "fm",
"@mozilla.org/focus-manager;1",
"nsIFocusManager");
let HTMLInputElement = Ci.nsIDOMHTMLInputElement;
let HTMLTextAreaElement = Ci.nsIDOMHTMLTextAreaElement;
let HTMLSelectElement = Ci.nsIDOMHTMLSelectElement;
let HTMLOptGroupElement = Ci.nsIDOMHTMLOptGroupElement;
let HTMLOptionElement = Ci.nsIDOMHTMLOptionElement;
let FormAssistant = {
init: function fa_init() {
addEventListener("focus", this, true, false);
addEventListener("blur", this, true, false);
addEventListener("keypress", this, true, false);
addEventListener("resize", this, true, false);
addMessageListener("Forms:Select:Choice", this);
addMessageListener("Forms:Input:Value", this);
Services.obs.addObserver(this, "ime-enabled-state-changed", false);
Services.obs.addObserver(this, "xpcom-shutdown", false);
},
isKeyboardOpened: false,
previousTarget : null,
handleEvent: function fa_handleEvent(evt) {
let previousTarget = this.previousTarget;
let target = evt.target;
switch (evt.type) {
case "focus":
if (this.isKeyboardOpened)
return;
let ignore = {
button: true,
file: true,
checkbox: true,
radio: true,
reset: true,
submit: true,
image: true
};
if (evt.target instanceof HTMLSelectElement) {
content.setTimeout(function showIMEForSelect() {
sendAsyncMessage("Forms:Input", getJSON(evt.target));
});
} else if (evt.target instanceof HTMLOptionElement &&
evt.target.parentNode instanceof HTMLSelectElement) {
content.setTimeout(function showIMEForSelect() {
sendAsyncMessage("Forms:Input", getJSON(evt.target.parentNode));
});
} else if ((target instanceof HTMLInputElement && !ignore[target.type]) ||
target instanceof HTMLTextAreaElement) {
this.isKeyboardOpened = this.tryShowIme(evt.target);
this.previousTarget = evt.target;
}
break;
case "blur":
if (this.previousTarget) {
sendAsyncMessage("Forms:Input", { "type": "blur" });
this.previousTarget = null;
}
break;
case "resize":
if (!this.isKeyboardOpened)
return;
let focusedElement = this.previousTarget;
if (focusedElement) {
focusedElement.scrollIntoView(false);
}
break;
case "keypress":
if (evt.keyCode != evt.DOM_VK_ESCAPE || !this.isKeyboardOpened)
return;
sendAsyncMessage("Forms:Input", { "type": "blur" });
this.isKeyboardOpened = false;
evt.preventDefault();
evt.stopPropagation();
break;
}
},
receiveMessage: function fa_receiveMessage(msg) {
let target = this.previousTarget;
if (!target) {
return;
}
let json = msg.json;
switch (msg.name) {
case "Forms:Input:Value":
target.value = json.value;
break;
case "Forms:Select:Choice":
let options = target.options;
if ("index" in json) {
options.item(json.index).selected = true;
} else if ("indexes" in json) {
for (let i = 0; i < options.length; i++) {
options.item(i).selected = (json.indexes.indexOf(i) != -1);
}
}
break;
}
},
observe: function fa_observe(subject, topic, data) {
switch (topic) {
case "ime-enabled-state-changed":
let isOpen = this.isKeyboardOpened;
let shouldOpen = parseInt(data);
if (shouldOpen && !isOpen) {
let target = Services.fm.focusedElement;
if (!target || !this.tryShowIme(target)) {
this.previousTarget = null;
return;
} else {
this.previousTarget = target;
}
} else if (!shouldOpen && isOpen) {
sendAsyncMessage("Forms:Input", { "type": "blur" });
}
this.isKeyboardOpened = shouldOpen;
break;
case "xpcom-shutdown":
Services.obs.removeObserver(this, "ime-enabled-state-changed", false);
Services.obs.removeObserver(this, "xpcom-shutdown");
removeMessageListener("Forms:Select:Choice", this);
break;
}
},
tryShowIme: function(element) {
if (!element) {
return;
}
// FIXME/bug 729623: work around apparent bug in the IME manager
// in gecko.
let readonly = element.getAttribute("readonly");
if (readonly) {
return false;
}
sendAsyncMessage("Forms:Input", getJSON(element));
return true;
}
};
FormAssistant.init();
function getJSON(element) {
let type = element.type || "";
// FIXME/bug 344616 is input type="number"
// Until then, let's return 'number' even if the platform returns 'text'
let attributeType = element.getAttribute("type") || "";
if (attributeType && attributeType.toLowerCase() === "number")
type = "number";
return {
"type": type.toLowerCase(),
"choices": getListForElement(element)
};
}
function getListForElement(element) {
if (!(element instanceof HTMLSelectElement))
return null;
let optionIndex = 0;
let result = {
"multiple": element.multiple,
"choices": []
};
// Build up a flat JSON array of the choices.
// In HTML, it's possible for select element choices to be under a
// group header (but not recursively). We distinguish between headers
// and entries using the boolean "list.group".
let children = element.children;
for (let i = 0; i < children.length; i++) {
let child = children[i];
if (child instanceof HTMLOptGroupElement) {
result.choices.push({
"group": true,
"text": child.label || child.firstChild.data,
"disabled": child.disabled
});
let subchildren = child.children;
for (let j = 0; j < subchildren.length; j++) {
let subchild = subchildren[j];
result.choices.push({
"group": false,
"inGroup": true,
"text": subchild.text,
"disabled": child.disabled || subchild.disabled,
"selected": subchild.selected,
"optionIndex": optionIndex++
});
}
} else if (child instanceof HTMLOptionElement) {
result.choices.push({
"group": false,
"inGroup": false,
"text": child.text,
"disabled": child.disabled,
"selected": child.selected,
"optionIndex": optionIndex++
});
}
}
return result;
};