/** * @license * Visual Blocks Editor * * Copyright 2017 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 Methods for dragging a flyout visually. * @author fenichel@google.com (Rachel Fenichel) */ 'use strict'; goog.provide('Blockly.FlyoutDragger'); goog.require('Blockly.WorkspaceDragger'); goog.require('goog.asserts'); goog.require('goog.math.Coordinate'); /** * Class for a flyout dragger. It moves a flyout workspace around when it is * being dragged by a mouse or touch. * Note that the workspace itself manages whether or not it has a drag surface * and how to do translations based on that. This simply passes the right * commands based on events. * @param {!Blockly.Flyout} flyout The flyout to drag. * @constructor */ Blockly.FlyoutDragger = function(flyout) { Blockly.FlyoutDragger.superClass_.constructor.call(this, flyout.getWorkspace()); /** * The scrollbar to update to move the flyout. * Unlike the main workspace, the flyout has only one scrollbar, in either the * horizontal or the vertical direction. * @type {!Blockly.Scrollbar} * @private */ this.scrollbar_ = flyout.scrollbar_; /** * Whether the flyout scrolls horizontally. If false, the flyout scrolls * vertically. * @type {boolean} * @private */ this.horizontalLayout_ = flyout.horizontalLayout_; }; goog.inherits(Blockly.FlyoutDragger, Blockly.WorkspaceDragger); /** * Move the appropriate scrollbar to drag the flyout. * Since flyouts only scroll in one direction at a time, this will discard one * of the calculated values. * x and y are in pixels. * @param {number} x The new x position to move the scrollbar to. * @param {number} y The new y position to move the scrollbar to. * @private */ Blockly.FlyoutDragger.prototype.updateScroll_ = function(x, y) { // Move the scrollbar and the flyout will scroll automatically. if (this.horizontalLayout_) { this.scrollbar_.set(x); } else { this.scrollbar_.set(y); } };