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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.
/**
* Sets the width (in pixels) on a DOM node.
* @param {!HtmlNode} node The node whose width is being set.
* @param {number} widthPx The width in pixels.
*/
function setNodeWidth(node, widthPx) {
node.style.width = widthPx.toFixed(0) + 'px';
}
/**
* Sets the height (in pixels) on a DOM node.
* @param {!HtmlNode} node The node whose height is being set.
* @param {number} heightPx The height in pixels.
*/
function setNodeHeight(node, heightPx) {
node.style.height = heightPx.toFixed(0) + 'px';
}
/**
* Sets the position and size of a DOM node (in pixels).
* @param {!HtmlNode} node The node being positioned.
* @param {number} leftPx The left position in pixels.
* @param {number} topPx The top position in pixels.
* @param {number} widthPx The width in pixels.
* @param {number} heightPx The height in pixels.
*/
function setNodePosition(node, leftPx, topPx, widthPx, heightPx) {
node.style.left = leftPx.toFixed(0) + 'px';
node.style.top = topPx.toFixed(0) + 'px';
setNodeWidth(node, widthPx);
setNodeHeight(node, heightPx);
}
/**
* Sets the visibility for a DOM node.
* @param {!HtmlNode} node The node being positioned.
* @param {boolean} isVisible Whether to show the node or not.
*/
function setNodeDisplay(node, isVisible) {
node.style.display = isVisible ? '' : 'none';
}
/**
* Adds a node to |parentNode|, of type |tagName|.
* @param {!HtmlNode} parentNode The node that will be the parent of the new
* element.
* @param {string} tagName the tag name of the new element.
* @return {!HtmlElement} The newly created element.
*/
function addNode(parentNode, tagName) {
var elem = parentNode.ownerDocument.createElement(tagName);
parentNode.appendChild(elem);
return elem;
}
/**
* Adds |text| to node |parentNode|.
* @param {!HtmlNode} parentNode The node to add text to.
* @param {string} text The text to be added.
* @return {!Object} The newly created text node.
*/
function addTextNode(parentNode, text) {
var textNode = parentNode.ownerDocument.createTextNode(text);
parentNode.appendChild(textNode);
return textNode;
}
/**
* Adds a node to |parentNode|, of type |tagName|. Then adds
* |text| to the new node.
* @param {!HtmlNode} parentNode The node that will be the parent of the new
* element.
* @param {string} tagName the tag name of the new element.
* @param {string} text The text to be added.
* @return {!HtmlElement} The newly created element.
*/
function addNodeWithText(parentNode, tagName, text) {
var elem = parentNode.ownerDocument.createElement(tagName);
parentNode.appendChild(elem);
addTextNode(elem, text);
return elem;
}
/**
* Returns the key such that map[key] == value, or the string '?' if
* there is no such key.
* @param {!Object} map The object being used as a lookup table.
* @param {Object} value The value to be found in |map|.
* @return {string} The key for |value|, or '?' if there is no such key.
*/
function getKeyWithValue(map, value) {
for (var key in map) {
if (map[key] == value)
return key;
}
return '?';
}
/**
* Returns a new map with the keys and values of the input map inverted.
* @param {!Object} map The object to have its keys and values reversed. Not
* modified by the function call.
* @return {Object} The new map with the reversed keys and values.
*/
function makeInverseMap(map) {
var reversed = {};
for (var key in map)
reversed[map[key]] = key;
return reversed;
}
/**
* Looks up |key| in |map|, and returns the resulting entry, if there is one.
* Otherwise, returns |key|. Intended primarily for use with incomplete
* tables, and for reasonable behavior with system enumerations that may be
* extended in the future.
* @param {!Object} map The table in which |key| is looked up.
* @param {string} key The key to look up.
* @return {Object|string} map[key], if it exists, or |key| if it doesn't.
*/
function tryGetValueWithKey(map, key) {
if (key in map)
return map[key];
return key;
}
/**
* Builds a string by repeating |str| |count| times.
* @param {string} str The string to be repeated.
* @param {number} count The number of times to repeat |str|.
* @return {string} The constructed string
*/
function makeRepeatedString(str, count) {
var out = [];
for (var i = 0; i < count; ++i)
out.push(str);
return out.join('');
}
/**
* Clones a basic POD object. Only a new top level object will be cloned. It
* will continue to reference the same values as the original object.
* @param {Object} object The object to be cloned.
* @return {Object} A copy of |object|.
*/
function shallowCloneObject(object) {
if (!(object instanceof Object))
return object;
var copy = {};
for (var key in object) {
copy[key] = object[key];
}
return copy;
}
/**
* Helper to make sure singleton classes are not instantiated more than once.
* @param {Function} ctor The constructor function being checked.
*/
function assertFirstConstructorCall(ctor) {
// This is the variable which is set by cr.addSingletonGetter().
if (ctor.hasCreateFirstInstance_) {
throw Error('The class ' + ctor.name + ' is a singleton, and should ' +
'only be accessed using ' + ctor.name + '.getInstance().');
}
ctor.hasCreateFirstInstance_ = true;
}
function hasTouchScreen() {
return 'ontouchstart' in window;
}
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