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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.
cr.define('print_preview', function() {
'use strict';
/**
* Checks if |text| has a valid margin value format. A valid format is
* parsable as a number and is greater than zero.
* Example: "1.00", "1", ".5", "1.1" are valid values.
* Example: "1.4dsf", "-1" are invalid.
* Note: The inch symbol (") at the end of |text| is allowed.
*
* @param {string} text The text to check.
* @return {number} The margin value represented by |text| or null if |text|
* does not represent a valid number.
*/
function extractMarginValue(text) {
// Removing whitespace anywhere in the string.
text = text.replace(/\s*/g, '');
if (text.length == 0)
return -1;
var validationRegex = getValidationRegExp();
if (validationRegex.test(text)) {
// Replacing decimal point with the dot symbol in order to use
// parseFloat() properly.
var replacementRegex = new RegExp('\\' +
print_preview.MarginSettings.decimalPoint + '{1}');
text = text.replace(replacementRegex, '.');
return parseFloat(text);
}
return -1;
}
/**
* @return {RegExp} A regular expression for validating the input of the user.
* It takes into account the user's locale.
*/
function getValidationRegExp() {
var regex = new RegExp('(^\\d+)(\\' +
print_preview.MarginSettings.thousandsPoint + '\\d{3})*(\\' +
print_preview.MarginSettings.decimalPoint + '\\d+)*' +
(!print_preview.MarginSettings.useMetricSystem ? '"?' : '(mm)?') + '$');
return regex;
}
var marginValidationStates = {
TOO_SMALL: 0,
WITHIN_RANGE: 1,
TOO_BIG: 2,
NOT_A_NUMBER: 3
};
/**
* Checks whether |value| is within range [0, limit].
* @return {number} An appropriate value from enum |marginValidationStates|.
*/
function validateMarginValue(value, limit) {
if (value <= limit && value >= 0)
return marginValidationStates.WITHIN_RANGE;
else if (value < 0)
return marginValidationStates.TOO_SMALL;
else
return marginValidationStates.TOO_BIG;
}
/**
* @param {string} text The text to check in user's locale units.
* @param {number} limit The upper bound of the valid margin range (in
* points).
* @return {number} An appropriate value from enum |marginValidationStates|.
*/
function validateMarginText(text, limit) {
var value = extractMarginValue(text);
if (value == -1)
return marginValidationStates.NOT_A_NUMBER;
value = print_preview.convertLocaleUnitsToPoints(value);
return validateMarginValue(value, limit);
}
/**
* @param {number} value The value to convert in points.
* @return {number} The corresponding value after converting to user's locale
* units.
*/
function convertPointsToLocaleUnits(value) {
return print_preview.MarginSettings.useMetricSystem ?
convertPointsToMillimeters(value) : convertPointsToInches(value);
}
/**
* @param {number} value The value to convert in user's locale units.
* @return {number} The corresponding value after converting to points.
*/
function convertLocaleUnitsToPoints(value) {
return print_preview.MarginSettings.useMetricSystem ?
convertMillimetersToPoints(value) : convertInchesToPoints(value);
}
/**
* Converts |value| to user's locale units and then back to points. Note:
* Because of the precision the return value might be different than |value|.
* @param {number} value The value in points to convert.
* @return {number} The value in points after converting to user's locale
* units with a certain precision and back.
*/
function convertPointsToLocaleUnitsAndBack(value) {
var inLocaleUnits =
convertPointsToLocaleUnits(value).toFixed(getDesiredPrecision());
return convertLocaleUnitsToPoints(inLocaleUnits);
}
/**
* @return {number} The number of decimal digits to keep based on the
* measurement system used.
*/
function getDesiredPrecision() {
return print_preview.MarginSettings.useMetricSystem ? 0 : 2;
}
/**
* @param {number} value The value to convert in points.
* @return {string} The equivalent text in user locale units with precision
* of two digits.
*/
function convertPointsToLocaleUnitsText(value) {
var inLocaleUnits =
convertPointsToLocaleUnits(value).toFixed(getDesiredPrecision());
var inLocaleUnitsText = inLocaleUnits.toString(10).replace(
/\./g, print_preview.MarginSettings.decimalPoint);
return !print_preview.MarginSettings.useMetricSystem ?
inLocaleUnitsText + '"' : inLocaleUnitsText + 'mm';
}
/**
* Creates a Rect object. This object describes a rectangle in a 2D plane. The
* units of |x|, |y|, |width|, |height| are chosen by clients of this class.
* @constructor
*/
function Rect(x, y, width, height) {
// @type {number} Horizontal distance of the upper left corner from origin.
this.x = x;
// @type {number} Vertical distance of the upper left corner from origin.
this.y = y;
// @type {number} Width of |this| rectangle.
this.width = width;
// @type {number} Height of |this| rectangle.
this.height = height;
};
Rect.prototype = {
/**
* @type {number} The x coordinate of the right-most point.
*/
get right() {
return this.x + this.width;
},
/**
* @type {number} The y coordinate of the lower-most point.
*/
get bottom() {
return this.y + this.height;
},
/**
* Clones |this| and returns the cloned object.
* @return {Rect} A copy of |this|.
*/
clone: function() {
return new Rect(this.x, this.y, this.width, this.height);
}
};
return {
convertPointsToLocaleUnitsAndBack:
convertPointsToLocaleUnitsAndBack,
convertPointsToLocaleUnitsText: convertPointsToLocaleUnitsText,
convertLocaleUnitsToPoints: convertLocaleUnitsToPoints,
extractMarginValue: extractMarginValue,
marginValidationStates: marginValidationStates,
Rect: Rect,
validateMarginText: validateMarginText,
validateMarginValue: validateMarginValue
};
});
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