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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Redefine '$' here rather than including 'cr.js', since this is
// the only function needed. This allows this file to be loaded
// in a browser directly for layout and some testing purposes.
var $ = function(id) { return document.getElementById(id); };
/**
* WebUI for configuring gesture.* preference values used by
* Chrome's gesture recognition system.
*/
var gesture_config = (function() {
'use strict';
/** Common prefix of gesture preferences. **/
/** @const */ var GESTURE_PREFIX = 'gesture.';
/** List of fields used to dynamically build form. **/
var FIELDS = [
{
key: 'long_press_time_in_seconds',
label: 'Long Press Time',
units: 'seconds',
default: 1.0
},
{
key: 'semi_long_press_time_in_seconds',
label: 'Semi Long Press Time',
units: 'seconds',
default: 0.5
},
{
key: 'max_seconds_between_double_click',
label: 'Maximum Double Click Interval',
units: 'seconds',
step: 0.1,
default: 0.7
},
{
key: 'max_separation_for_gesture_touches_in_pixels',
label: 'Maximum Separation for Gesture Touches',
units: 'pixels',
default: 150
},
{
key: 'max_swipe_deviation_ratio',
label: 'Maximum Swipe Deviation',
units: '',
default: 3
},
{
key: 'max_touch_down_duration_in_seconds_for_click',
label: 'Maximum Touch-Down Duration for Click',
units: 'seconds',
step: 0.1,
default: 0.8
},
{
key: 'max_touch_move_in_pixels_for_click',
label: 'Maximum Touch-Move for Click',
units: 'pixels',
default: 20
},
{
key: 'min_distance_for_pinch_scroll_in_pixels',
label: 'Minimum Distance for Pinch Scroll',
units: 'pixels',
default: 20
},
{
key: 'min_flick_speed_squared',
label: 'Minimum Flick Speed Squared',
units: '(pixels/sec.)<sup>2</sup>',
default: 550 * 550
},
{
key: 'min_pinch_update_distance_in_pixels',
label: 'Minimum Pinch Update Distance',
units: 'pixels',
default: 5
},
{
key: 'min_rail_break_velocity',
label: 'Minimum Rail-Break Velocity',
units: 'pixels/sec.',
default: 200
},
{
key: 'min_scroll_delta_squared',
label: 'Minimum Scroll Delta Squared',
units: '',
default: 5 * 5
},
{
key: 'min_swipe_speed',
label: 'Minimum Swipe Speed',
units: 'pixels/sec.',
default: 20
},
{
key: 'min_touch_down_duration_in_seconds_for_click',
label: 'Minimum Touch-Down Duration for Click',
units: 'seconds',
step: 0.01,
default: 0.01
},
{
key: 'points_buffered_for_velocity',
label: 'Points Buffered for Velocity',
units: '',
step: 1,
default: 3
},
{
key: 'rail_break_proportion',
label: 'Rail-Break Proportion',
units: '%',
default: 15
},
{
key: 'rail_start_proportion',
label: 'Rail-Start Proportion',
units: '%',
default: 2
}
];
/**
* Dynamically builds web-form based on FIELDS list.
* @return {string} The form's HTML.
*/
function buildForm() {
var buf = [];
for (var i = 0; i < FIELDS.length; i++) {
var field = FIELDS[i];
var row = $('gesture-form-row').cloneNode(true);
var label = row.querySelector('.row-label');
var input = row.querySelector('.row-input');
var units = row.querySelector('.row-units');
row.id = '';
label.setAttribute('for', field.key);
label.textContent = field.label;
input.id = field.key;
input.min = field.min || 0;
input.title = "Default Value: " + field.default;
if (field.max) input.max = field.max;
if (field.step) input.step = field.step;
$('gesture-form').appendChild(row);
if (field.units)
units.innerHTML = field.units;
}
}
/**
* Initialize the form by adding 'onChange' listeners to all fields.
*/
function initForm() {
for (var i = 0; i < FIELDS.length; i++) {
var field = FIELDS[i];
$(field.key).onchange = (function(key) {
setPreferenceValue(key, $(key).value);
}).bind(null, field.key);
}
}
/**
* Request a preference setting's value.
* This method is asynchronous; the result is provided by a call to
* getPreferenceValueResult.
* @param {string} prefName The name of the preference value being requested.
*/
function getPreferenceValue(prefName) {
chrome.send('getPreferenceValue', [GESTURE_PREFIX + prefName]);
}
/**
* Handle callback from call to getPreferenceValue.
* @param {string} prefName The name of the requested preference value.
* @param {value} value The current value associated with prefName.
*/
function getPreferenceValueResult(prefName, value) {
prefName = prefName.substring(prefName.indexOf('.') + 1);
$(prefName).value = value;
}
/**
* Set a preference setting's value.
* @param {string} prefName The name of the preference value being set.
* @param {value} value The value to be associated with prefName.
*/
function setPreferenceValue(prefName, value) {
chrome.send(
'setPreferenceValue',
[GESTURE_PREFIX + prefName, parseFloat(value)]);
}
/**
* Handle processing of "Reset" button.
* Causes off form values to be updated based on current preference values.
*/
function onReset() {
for (var i = 0; i < FIELDS.length; i++) {
var field = FIELDS[i];
$(field.key).value = field.default;
setPreferenceValue(field.key, field.default);
}
return false;
}
function loadForm() {
for (var i = 0; i < FIELDS.length; i++)
getPreferenceValue(FIELDS[i].key);
}
/**
* Build and initialize the gesture configuration form.
*/
function initialize() {
buildForm();
loadForm();
initForm();
$('reset-button').onclick = onReset.bind(this);
}
return {
initialize: initialize,
getPreferenceValueResult: getPreferenceValueResult
};
})();
document.addEventListener('DOMContentLoaded', gesture_config.initialize);
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