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/* -*- Mode: js; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
'use strict';
/**
* System app is made of a top-level `<div ="screen"></div>` DOM element
* which contain all possible screens displayed by the app.
* Multiple screens can be displayed at a time. We store the list of currently
* visible screens into this DOM element class attribute.
*/
var SystemScreen = {
screen: document.getElementById('screen'),
show: function ss_show(screenName) {
this.screen.classList.add(screenName);
},
hide: function ss_show(screenName) {
this.screen.classList.remove(screenName);
},
isVisible: function ss_isVisible(screenName) {
return this.screen.classList.contains(screenName);
}
};
/**
* System app displays various kind of dialogs.
* A dialog is a system app 'screen' that has a high z-index and is used to be
* displayed on top of other apps. But it doesn't display over the status bar,
* nor the eventually displayed keyboard.
*
* `SystemDialog` except the dialog DOM Element `id`.
* This DOM Element has to have a DOM attribute 'role' set to 'dialog'.
*
* It also supports a second `options` object with following attributes:
* `onHide`: function called when dialog is hidden, either when `hide()`
* method is called, or when dialog is automatically hidden on
* home button press
*/
function SystemDialog(id, options) {
var overlay = document.getElementById('dialog-overlay');
var dialog = document.getElementById(id);
var screenName = 'dialog';
// Listen to keyboard visibility changes and window resizing
// in order to resize the dialog accordingly
function updateHeight(keyboardHeight) {
if (SystemScreen.isVisible(screenName)) {
var height = window.innerHeight -
(keyboardHeight ? keyboardHeight : 0) -
StatusBar.height;
overlay.style.height = height + 'px';
}
};
function handleEvent(evt) {
switch (evt.type) {
case 'resize':
case 'keyboardhide':
updateHeight();
break;
case 'keyboardchange':
updateHeight(evt.detail.height);
break;
case 'home':
case 'holdhome':
// Automatically hide the dialog on home button press
if (SystemScreen.isVisible(screenName)) {
hide(evt.type);
// Prevent WindowManager to shift homescreen to the first page
// when the dialog is on top of the homescreen
var displayedApp = WindowManager.getDisplayedApp();
var displayedAppFrame = WindowManager.getAppFrame(displayedApp);
if (evt.type == 'home' &&
displayedAppFrame.classList.contains('homescreen'))
evt.stopImmediatePropagation();
}
break;
}
};
window.addEventListener('resize', handleEvent);
window.addEventListener('keyboardchange', handleEvent);
window.addEventListener('keyboardhide', handleEvent);
window.addEventListener('home', handleEvent);
window.addEventListener('holdhome', handleEvent);
function show() {
dialog.hidden = false;
dialog.classList.add(id);
SystemScreen.show(screenName);
updateHeight();
}
function hide(reason) {
dialog.hidden = true;
dialog.classList.remove(id);
SystemScreen.hide(screenName);
if (typeof(options.onHide) == 'function')
options.onHide(reason);
}
function isVisible() {
return SystemScreen.isVisible(screenName) &&
overlay.classList.contains(id);
}
return {
show: show,
hide: hide,
isVisible: isVisible
};
}
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