core/field_variable_define.js
/**
* @license
* Visual Blocks Editor
*
* Copyright 2012 Google Inc.
* https://blockly.googlecode.com/
*
* 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 Variable input field.
* @author fraser@google.com (Neil Fraser)
*/
'use strict';
goog.provide('Blockly.FieldVariableDefine');
goog.require('Blockly.FieldDropdown');
goog.require('Blockly.Msg');
goog.require('Blockly.Variables');
/**
* Class for a variable's dropdown field.
* @param {?string} varname The default name for the variable. If null,
* a unique variable name will be generated.
* @param {Function} opt_changeHandler A function that is executed when a new
* option is selected. Its sole argument is the new option value. Its
* return value is ignored.
* @extends {Blockly.FieldDropdown}
* @constructor
*/
Blockly.FieldVariableDefine = function(varname, opt_changeHandler, block) {
Blockly.FieldVariableDefine.superClass_.constructor.call(this,
Blockly.FieldVariableDefine.dropdownCreate, opt_changeHandler, block);
if (varname) {
this.setValue(varname);
} else {
this.setValue(Blockly.Variables.generateUniqueName());
}
};
goog.inherits(Blockly.FieldVariableDefine, Blockly.FieldDropdown);
/**
* Clone this FieldVariableArray.
* @return {!Blockly.FieldVariableArray} The result of calling the constructor again
* with the current values of the arguments used during construction.
*/
Blockly.FieldVariableDefine.prototype.clone = function() {
return new Blockly.FieldVariableDefine(this.getValue(), this.changeHandler_);
};
/**
* Get the variable's name (use a variableDB to convert into a real name).
* Unline a regular dropdown, variables are literal and have no neutral value.
* @return {string} Current text.
*/
Blockly.FieldVariableDefine.prototype.getValue = function() {
return this.getText();
};
/**
* Set the variable name.
* @param {string} text New text.
*/
Blockly.FieldVariableDefine.prototype.setValue = function(text) {
this.value_ = text;
this.setText(text);
};
/**
* Return a sorted list of variable names for variable dropdown menus.
* Include a special option at the end for creating a new variable name.
* @return {!Array.<string>} Array of variable names.
* @this {!Blockly.FieldVariableArray}
*/
Blockly.FieldVariableDefine.dropdownCreate = function(block) {
var variableListPop = Blockly.FieldDropdown.prototype.listCreate(block, 0);
// Ensure that the currently selected variable is an option.
var name = this.getText();
if (name && variableListPop.indexOf(name) == -1) {
variableListPop.push(name);
}
else variableListPop.push(Blockly.Msg.SELECT_MENU);
variableListPop.sort(goog.string.caseInsensitiveCompare);
var options = [];
for (var x = 0; x < variableListPop.length; x++) {
options[x] = [variableListPop[x], variableListPop[x]];
}
return options;
};
/**
* Event handler for a change in variable name.
* Special case the 'New variable...' and 'Rename variable...' options.
* In both of these special cases, prompt the user for a new name.
* @param {string} text The selected dropdown menu option.
* @return {null|undefined|string} An acceptable new variable name, or null if
* change is to be either aborted (cancel button) or has been already
* handled (rename), or undefined if an existing variable was chosen.
* @this {!Blockly.FieldVariableArray}
*/
// Blockly.FieldVariableArray.dropdownChange = function(text) {
// function promptName(promptText, defaultText) {
// Blockly.hideChaff();
// var newVar = window.prompt(promptText, defaultText);
// // Merge runs of whitespace. Strip leading and trailing whitespace.
// // Beyond this, all names are legal.
// return newVar && newVar.replace(/[\s\xa0]+/g, ' ').replace(/^ | $/g, '');
// }
// if (text == Blockly.Msg.RENAME_VARIABLE) {
// var oldVar = this.getText();
// text = promptName(Blockly.Msg.RENAME_VARIABLE_TITLE.replace('%1', oldVar),
// oldVar);
// if (text) {
// Blockly.Variables.renameVariable(oldVar, text);
// }
// return null;
// } else if (text == Blockly.Msg.NEW_VARIABLE) {
// text = promptName(Blockly.Msg.NEW_VARIABLE_TITLE, '');
// // Since variables are case-insensitive, ensure that if the new variable
// // matches with an existing variable, the new case prevails throughout.
// if (text) {
// Blockly.Variables.renameVariable(text, text);
// return text;
// }
// return null;
// }
// return undefined;
// };