mirror of
https://github.com/google/blockly.git
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104 lines
2.5 KiB
JavaScript
104 lines
2.5 KiB
JavaScript
/**
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* @license
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* Visual Blocks Editor
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*
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* Copyright 2019 Google Inc.
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* https://developers.google.com/blockly/
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview The class representing a cursor used to navigate the flyout.
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* Used primarily for keyboard navigation.
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* @author aschmiedt@google.com (Abby Schmiedt)
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*/
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'use strict';
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goog.provide('Blockly.FlyoutCursor');
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goog.require('Blockly.Cursor');
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goog.require('Blockly.utils.object');
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/**
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* Class for a flyout cursor.
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* This controls how a user navigates blocks in the flyout.
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* @constructor
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* @extends {Blockly.Cursor}
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*/
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Blockly.FlyoutCursor = function() {
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Blockly.FlyoutCursor.superClass_.constructor.call(this);
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};
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Blockly.utils.object.inherits(Blockly.FlyoutCursor, Blockly.Cursor);
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/**
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* Find the next connection, field, or block.
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* @return {Blockly.ASTNode} The next element, or null if the current node is
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* not set or there is no next value.
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* @override
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*/
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Blockly.FlyoutCursor.prototype.next = function() {
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if (!this.isMarker_) {
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var curNode = this.getCurNode();
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if (!curNode) {
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return null;
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}
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var newNode = curNode.next();
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if (newNode) {
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this.setLocation(newNode);
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}
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return newNode;
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}
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};
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/**
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* This is a no-op since a flyout cursor can not go in.
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* @return {null} Always null.
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* @override
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*/
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Blockly.FlyoutCursor.prototype.in = function() {
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return null;
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};
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/**
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* Find the previous connection, field, or block.
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* @return {Blockly.ASTNode} The previous element, or null if the current node
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* is not set or there is no previous value.
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* @override
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*/
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Blockly.FlyoutCursor.prototype.prev = function() {
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if (!this.isMarker_) {
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var curNode = this.getCurNode();
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if (!curNode) {
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return null;
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}
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var newNode = curNode.prev();
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if (newNode) {
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this.setLocation(newNode);
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}
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return newNode;
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}
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};
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/**
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* This is a no-op since a flyout cursor can not go out.
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* @return {null} Always null.
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* @override
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*/
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Blockly.FlyoutCursor.prototype.out = function() {
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return null;
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};
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