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/**
* @license
* Visual Blocks Editor
*
* Copyright 2012 Google Inc.
* https://developers.google.com/blockly/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @fileoverview Checkbox field. Checked or not checked.
* @author fraser@google.com (Neil Fraser)
*/
'use strict';
goog.provide('Blockly.FieldCheckbox');
goog.require('Blockly.Field');
/**
* Class for a checkbox field.
* @param {string} state The initial state of the field ('TRUE' or 'FALSE').
* @param {Function=} opt_validator A function that is executed when a new
* option is selected. Its sole argument is the new checkbox state. If
* it returns a value, this becomes the new checkbox state, unless the
* value is null, in which case the change is aborted.
* @extends {Blockly.Field}
* @constructor
*/
Blockly.FieldCheckbox = function(state, opt_validator) {
Blockly.FieldCheckbox.superClass_.constructor.call(this, '', opt_validator);
// Set the initial state.
this.setValue(state);
};
goog.inherits(Blockly.FieldCheckbox, Blockly.Field);
/**
* Character for the checkmark.
*/
Blockly.FieldCheckbox.CHECK_CHAR = '\u2713';
/**
* Mouse cursor style when over the hotspot that initiates editability.
*/
Blockly.FieldCheckbox.prototype.CURSOR = 'default';
/**
* Install this checkbox on a block.
*/
Blockly.FieldCheckbox.prototype.init = function() {
if (this.fieldGroup_) {
// Checkbox has already been initialized once.
return;
}
Blockly.FieldCheckbox.superClass_.init.call(this);
// The checkbox doesn't use the inherited text element.
// Instead it uses a custom checkmark element that is either visible or not.
this.checkElement_ = Blockly.createSvgElement('text',
{'class': 'blocklyText blocklyCheckbox', 'x': -3, 'y': 14},
this.fieldGroup_);
var textNode = document.createTextNode(Blockly.FieldCheckbox.CHECK_CHAR);
this.checkElement_.appendChild(textNode);
this.checkElement_.style.display = this.state_ ? 'block' : 'none';
};
/**
* Return 'TRUE' if the checkbox is checked, 'FALSE' otherwise.
* @return {string} Current state.
*/
Blockly.FieldCheckbox.prototype.getValue = function() {
return String(this.state_).toUpperCase();
};
/**
* Set the checkbox to be checked if strBool is 'TRUE', unchecks otherwise.
* @param {string} strBool New state.
*/
Blockly.FieldCheckbox.prototype.setValue = function(strBool) {
var newState = (strBool == 'TRUE');
if (this.state_ !== newState) {
if (this.sourceBlock_ && Blockly.Events.isEnabled()) {
Blockly.Events.fire(new Blockly.Events.Change(
this.sourceBlock_, 'field', this.name, this.state_, newState));
}
this.state_ = newState;
if (this.checkElement_) {
this.checkElement_.style.display = newState ? 'block' : 'none';
}
}
};
/**
* Toggle the state of the checkbox.
* @private
*/
Blockly.FieldCheckbox.prototype.showEditor_ = function() {
var newState = !this.state_;
if (this.sourceBlock_) {
// Call any validation function, and allow it to override.
newState = this.callValidator(newState);
}
if (newState !== null) {
this.setValue(String(newState).toUpperCase());
}
};
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