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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 Variable input field.
* @author fraser@google.com (Neil Fraser)
*/
'use strict';
goog.provide('Blockly.FieldVariable');
goog.require('Blockly.FieldDropdown');
goog.require('Blockly.Msg');
goog.require('Blockly.Variables');
goog.require('goog.string');
/**
* 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_validator A function that is executed when a new
* option is selected. Its sole argument is the new option value.
* @extends {Blockly.FieldDropdown}
* @constructor
*/
Blockly.FieldVariable = function(varname, opt_validator) {
Blockly.FieldVariable.superClass_.constructor.call(this,
Blockly.FieldVariable.dropdownCreate, opt_validator);
this.setValue(varname || '');
};
goog.inherits(Blockly.FieldVariable, Blockly.FieldDropdown);
/**
* Install this dropdown on a block.
*/
Blockly.FieldVariable.prototype.init = function() {
if (this.fieldGroup_) {
// Dropdown has already been initialized once.
return;
}
Blockly.FieldVariable.superClass_.init.call(this);
if (!this.getValue()) {
// Variables without names get uniquely named for this workspace.
var workspace =
this.sourceBlock_.isInFlyout ?
this.sourceBlock_.workspace.targetWorkspace :
this.sourceBlock_.workspace;
this.setValue(Blockly.Variables.generateUniqueName(workspace));
}
// If the selected variable doesn't exist yet, create it.
// For instance, some blocks in the toolbox have variable dropdowns filled
// in by default.
if (!this.sourceBlock_.isInFlyout) {
this.sourceBlock_.workspace.createVariable(this.getValue());
}
};
/**
* 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.FieldVariable.prototype.getValue = function() {
return this.getText();
};
/**
* Set the variable name.
* @param {string} newValue New text.
*/
Blockly.FieldVariable.prototype.setValue = function(newValue) {
if (this.sourceBlock_ && Blockly.Events.isEnabled()) {
Blockly.Events.fire(new Blockly.Events.Change(
this.sourceBlock_, 'field', this.name, this.value_, newValue));
}
this.value_ = newValue;
this.setText(newValue);
};
/**
* 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.FieldVariable}
*/
Blockly.FieldVariable.dropdownCreate = function() {
if (this.sourceBlock_ && this.sourceBlock_.workspace) {
// Get a copy of the list, so that adding rename and new variable options
// doesn't modify the workspace's list.
var variableList = this.sourceBlock_.workspace.variableList.slice(0);
} else {
var variableList = [];
}
// Ensure that the currently selected variable is an option.
var name = this.getText();
if (name && variableList.indexOf(name) == -1) {
variableList.push(name);
}
variableList.sort(goog.string.caseInsensitiveCompare);
variableList.push(Blockly.Msg.RENAME_VARIABLE);
variableList.push(Blockly.Msg.DELETE_VARIABLE.replace('%1', name));
// Variables are not language-specific, use the name as both the user-facing
// text and the internal representation.
var options = [];
for (var i = 0; i < variableList.length; i++) {
options[i] = [variableList[i], variableList[i]];
}
return options;
};
/**
* Event handler for a change in variable name.
* Special case the 'Rename variable...' and 'Delete variable...' options.
* In the rename case, 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.
*/
Blockly.FieldVariable.prototype.classValidator = function(text) {
var workspace = this.sourceBlock_.workspace;
if (text == Blockly.Msg.RENAME_VARIABLE) {
var oldVar = this.getText();
Blockly.hideChaff();
text = Blockly.Variables.promptName(
Blockly.Msg.RENAME_VARIABLE_TITLE.replace('%1', oldVar), oldVar);
if (text) {
workspace.renameVariable(oldVar, text);
}
return null;
} else if (text == Blockly.Msg.DELETE_VARIABLE.replace('%1',
this.getText())) {
workspace.deleteVariable(this.getText());
return null;
}
return undefined;
};
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