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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';
box.setAttribute('aria-label', localStrings.getString(groupName));
// @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 {number} The upper allowed limit for the corresponding margin.
box.valueLimit = null;
box.addEventListeners_();
return box;
}
MarginTextbox.CSS_CLASS_MARGIN_TEXTBOX = 'margin-box';
// Keycode for the "Escape" key.
MarginTextbox.ESCAPE_KEYCODE = 27;
// Keycode for the "Enter" key.
MarginTextbox.ENTER_KEYCODE = 13;
MarginTextbox.prototype = {
__proto__: HTMLInputElement.prototype,
/**
* @type {number} The margin value currently in the textbox.
*/
get margin() {
return print_preview.extractMarginValue(this.value);
},
/**
* Sets the contents of the textbox.
* @param {number} newValueInPoints The value to be displayed in points.
* @private
*/
setValue_: function(newValueInPoints) {
this.value =
print_preview.convertPointsToLocaleUnitsText(newValueInPoints);
},
/**
* Updates the state of |this|.
* @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(value, valueLimit, keepDisplayedValue) {
this.lastValidValueInPoints = value;
if (!keepDisplayedValue)
this.setValue_(this.lastValidValueInPoints);
this.valueLimit = valueLimit;
this.validate();
},
/**
* Updates |this| while dragging is in progress.
* @param {number} dragDeltaInPoints The difference in points between the
* margin value before dragging started and now.
*/
updateWhileDragging: function(dragDeltaInPoints) {
var validity = this.validateDelta(dragDeltaInPoints);
if (validity == print_preview.marginValidationStates.WITHIN_RANGE)
this.setValue_(this.lastValidValueInPoints + dragDeltaInPoints);
else if (validity == print_preview.marginValidationStates.TOO_SMALL)
this.setValue_(0);
else if (validity == print_preview.marginValidationStates.TOO_BIG)
this.setValue_(this.valueLimit);
this.validate();
this.updateColor();
},
/**
* @param {number} dragDeltaInPoints The difference in points between the
* margin value before dragging started and now.
* @return {number} An appropriate value from enum |marginValidationStates|.
*/
validateDelta: function(dragDeltaInPoints) {
var newValue = this.lastValidValueInPoints + dragDeltaInPoints;
return print_preview.validateMarginValue(newValue, this.valueLimit);
},
/**
* Updates |this.isValid|.
*/
validate: function() {
this.isValid =
print_preview.validateMarginText(this.value, this.valueLimit) ==
print_preview.marginValidationStates.WITHIN_RANGE;
},
/**
* 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() {
this.updateColor();
},
/**
* 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);
this.onfocus = function() {
cr.dispatchSimpleEvent(document, customEvents.MARGIN_TEXTBOX_FOCUSED);
};
},
/**
* Executes whenever a blur event occurs.
* @private
*/
onBlur_: function() {
clearTimeout(this.timerId_);
this.validate();
if (!this.isValid) {
this.setValue_(this.lastValidValueInPoints);
this.validate();
}
this.updateColor();
cr.dispatchSimpleEvent(document, customEvents.UPDATE_SUMMARY);
cr.dispatchSimpleEvent(document, customEvents.UPDATE_PRINT_BUTTON);
cr.dispatchSimpleEvent(this, customEvents.MARGINS_MAY_HAVE_CHANGED);
},
/**
* 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.setValue_(this.lastValidValueInPoints);
this.validate();
this.updateColor();
cr.dispatchSimpleEvent(document, customEvents.UPDATE_SUMMARY);
cr.dispatchSimpleEvent(document, customEvents.UPDATE_PRINT_BUTTON);
}
},
/**
* 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), 1000);
},
/**
* Executes whenever the user stops typing or when a drag session associated
* with |this| ends.
*/
onTextValueMayHaveChanged: function() {
this.validate();
this.updateColor();
cr.dispatchSimpleEvent(document, customEvents.UPDATE_SUMMARY);
cr.dispatchSimpleEvent(document, customEvents.UPDATE_PRINT_BUTTON);
if (!this.isValid)
return;
cr.dispatchSimpleEvent(this, customEvents.MARGINS_MAY_HAVE_CHANGED);
}
};
return {
MarginTextbox: MarginTextbox
};
});
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