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// Copyright (c) 2011 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() {
'strict';
function MarginTextbox(groupName) {
var box = document.createElement('input');
box.__proto__ = MarginTextbox.prototype;
box.setAttribute('type', 'text');
box.className = MarginTextbox.CSS_CLASS_MARGIN_TEXTBOX;
box.value = '0';
// @type {string} Specifies which margin this line refers to.
box.marginGroup = groupName;
// @type {boolean} True if the displayed value is valid.
box.isValid = true;
// @type {number} Timer used to detect when the user stops typing.
box.timerId_ = null;
// @type {number} The last valid value in points.
box.lastValidValueInPoints = 0;
// @type {print_preview.Rect} A rectangle describing the four margins.
box.marginsRectangle_ = null;
// @type {number} The upper allowed limit for the corresponding margin.
box.valueLimit = null;
box.addEventListeners_();
return box;
}
MarginTextbox.CSS_CLASS_MARGIN_TEXTBOX = 'margin-box';
MarginTextbox.MARGIN_BOX_HEIGHT = 15;
MarginTextbox.MARGIN_BOX_VERTICAL_PADDING = 5;
MarginTextbox.MARGIN_BOX_WIDTH = 40;
MarginTextbox.MARGIN_BOX_HORIZONTAL_PADDING = 10;
// Keycode for the "Escape" key.
MarginTextbox.ESCAPE_KEYCODE = 27;
// Keycode for the "Enter" key.
MarginTextbox.ENTER_KEYCODE = 13;
MarginTextbox.convertPointsToInchesText = function(toConvert) {
var inInches = convertPointsToInches(toConvert);
return MarginTextbox.convertInchesToInchesText(inInches);
};
MarginTextbox.convertInchesToInchesText = function(toConvert) {
return toConvert.toFixed(2) + '"';
};
/**
* @return {number} The total height of a margin textbox (including padding).
*/
MarginTextbox.totalHeight = function() {
return MarginTextbox.MARGIN_BOX_HEIGHT +
2 * MarginTextbox.MARGIN_BOX_VERTICAL_PADDING;
}
/**
* @return {number} The total width of a margin textbox (including padding).
*/
MarginTextbox.totalWidth = function() {
return MarginTextbox.MARGIN_BOX_WIDTH +
2 * MarginTextbox.MARGIN_BOX_HORIZONTAL_PADDING;
}
MarginTextbox.prototype = {
__proto__: HTMLInputElement.prototype,
/**
* Updates the state of |this|.
* @param {print_preview.Rect} marginsRectangle A rectangle describing the
* margins in percentages.
* @param {number} value The margin value in points.
* @param {number} valueLimit The upper allowed value for the margin.
* @param {boolean} keepDisplayedValue True if the currently displayed value
* should not be updated.
*/
update: function(marginsRectangle, value, valueLimit, keepDisplayedValue) {
this.marginsRectangle_ = marginsRectangle;
this.lastValidValueInPoints = value;
if (!keepDisplayedValue) {
this.value = MarginTextbox.convertPointsToInchesText(
this.lastValidValueInPoints);
}
this.valueLimit = valueLimit;
this.validate();
},
get margin() {
return print_preview.extractMarginValue(this.value);
},
/**
* Updates |this.isValid|.
*/
validate: function() {
this.isValid = print_preview.isMarginTextValid(this.value,
this.valueLimit);
if (this.isValid)
this.value = MarginTextbox.convertInchesToInchesText(this.margin);
},
/**
* Updates the background color depending on |isValid| by adding/removing
* the appropriate CSS class.
* @param {boolean} isValid True if the margin is valid.
*/
updateColor: function() {
this.isValid ? this.classList.remove('invalid') :
this.classList.add('invalid');
},
/**
* Draws this textbox.
*/
draw: function() {
var topLeft = this.getCoordinates_();
var totalWidth = previewArea.pdfPlugin_.offsetWidth;
var totalHeight = previewArea.pdfPlugin_.offsetHeight;
this.style.left = Math.round(topLeft.x * totalWidth) + 'px';
this.style.top = Math.round(topLeft.y * totalHeight) + 'px';
this.updateColor();
},
/**
* @return {boolean} True if |this| refers to the top margin.
* @private
*/
isTop_: function() {
return this.marginGroup == print_preview.MarginSettings.TOP_GROUP;
},
/**
* @return {boolean} True if |this| refers to the bottom margin.
* @private
*/
isBottom_: function() {
return this.marginGroup == print_preview.MarginSettings.BOTTOM_GROUP;
},
/**
* @return {boolean} True if |this| refers to the left margin.
* @private
*/
isLeft_: function() {
return this.marginGroup == print_preview.MarginSettings.LEFT_GROUP;
},
/**
* @return {boolean} True if |this| refers to the bottom margin.
* @private
*/
isRight_: function() {
return this.marginGroup == print_preview.MarginSettings.RIGHT_GROUP;
},
/**
* Calculates the coordinates where |this| should be displayed.
* @return {{x: number, y: number}} The coordinates (in percent) where
* |this| should be drawn relative to the upper left corner of the
* plugin.
* @private
*/
getCoordinates_: function() {
var x = 0, y = 0;
var totalWidth = previewArea.pdfPlugin_.offsetWidth;
var totalHeight = previewArea.pdfPlugin_.offsetHeight;
var offsetY = (MarginTextbox.totalHeight() / 2) / totalHeight;
var offsetX = (MarginTextbox.totalWidth() / 2) / totalWidth;
if (this.isTop_()) {
x = this.marginsRectangle_.middleX - offsetX;
y = this.marginsRectangle_.y;
} else if (this.isBottom_()) {
x = this.marginsRectangle_.middleX - offsetX;
y = this.marginsRectangle_.bottom - 2 * offsetY;
} else if (this.isRight_()) {
x = this.marginsRectangle_.right - 2 * offsetX;
y = this.marginsRectangle_.middleY - offsetY;
} else if (this.isLeft_()) {
x = this.marginsRectangle_.x;
y = this.marginsRectangle_.middleY - offsetY;
}
return { x: x, y: y };
},
/**
* Adds event listeners for various events.
* @private
*/
addEventListeners_: function() {
this.oninput = this.resetTimer_.bind(this);
this.onblur = this.onBlur_.bind(this);
this.onkeypress = this.onKeyPressed_.bind(this);
this.onkeyup = this.onKeyUp_.bind(this);
},
/**
* Executes whenever a blur event occurs.
* @private
*/
onBlur_: function() {
clearTimeout(this.timerId_);
this.validate();
if (!this.isValid) {
this.value = MarginTextbox.convertPointsToInchesText(
this.lastValidValueInPoints);
this.validate();
}
this.updateColor();
cr.dispatchSimpleEvent(document, 'updateSummary');
cr.dispatchSimpleEvent(document, 'updatePrintButton');
cr.dispatchSimpleEvent(this, 'MarginsMayHaveChanged');
},
/**
* Executes whenever a keypressed event occurs. Note: Only the "Enter" key
* event is handled. The "Escape" key does not result in such event,
* therefore it is handled by |this.onKeyUp_|.
* @param {KeyboardEvent} e The event that triggered this listener.
* @private
*/
onKeyPressed_: function(e) {
if (e.keyCode == MarginTextbox.ENTER_KEYCODE)
this.blur();
},
/**
* Executes whenever a keyup event occurs. Note: Only the "Escape"
* key event is handled.
* @param {KeyboardEvent} e The event that triggered this listener.
* @private
*/
onKeyUp_: function(e) {
if (e.keyCode == MarginTextbox.ESCAPE_KEYCODE) {
this.value = MarginTextbox.convertPointsToInchesText(
this.lastValidValueInPoints);
this.validate();
this.updateColor();
cr.dispatchSimpleEvent(document, 'updateSummary');
cr.dispatchSimpleEvent(document, 'updatePrintButton');
}
},
/**
* Resetting the timer used to detect when the user stops typing in order
* to update the print preview.
* @private
*/
resetTimer_: function() {
clearTimeout(this.timerId_);
this.timerId_ = window.setTimeout(
this.onTextValueMayHaveChanged_.bind(this), 500);
},
/**
* Executes whenever the user stops typing.
* @private
*/
onTextValueMayHaveChanged_: function() {
this.validate();
this.updateColor();
cr.dispatchSimpleEvent(document, 'updateSummary');
cr.dispatchSimpleEvent(document, 'updatePrintButton');
if (!this.isValid)
return;
cr.dispatchSimpleEvent(this, 'MarginsMayHaveChanged');
}
};
return {
MarginTextbox: MarginTextbox
};
});
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