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b46a4fe286
* Google changed from an Inc to an LLC. This happened back in 2017 but we didn’t notice. Officially we should update files from Inc to LLC when they are changed as part of regular edits, but this is a nightmare to remember for the next decade. * Remove project description/titles from licenses This is no longer part of Google’s header requirements. Our existing descriptions were useless (“Visual Blocks Editor”) or grossly obselete (“Visual Blocks Language”). * License no longer requires URL. * Fix license regexps.
96 lines
2.8 KiB
JavaScript
96 lines
2.8 KiB
JavaScript
/**
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* @license
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* Copyright 2017 Google LLC
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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 Methods for dragging a workspace visually.
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* @author fenichel@google.com (Rachel Fenichel)
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*/
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'use strict';
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goog.provide('Blockly.WorkspaceDragger');
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goog.require('Blockly.utils.Coordinate');
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/**
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* Class for a workspace dragger. It moves the workspace around when it is
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* being dragged by a mouse or touch.
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* Note that the workspace itself manages whether or not it has a drag surface
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* and how to do translations based on that. This simply passes the right
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* commands based on events.
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* @param {!Blockly.WorkspaceSvg} workspace The workspace to drag.
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* @constructor
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*/
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Blockly.WorkspaceDragger = function(workspace) {
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/**
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* @type {!Blockly.WorkspaceSvg}
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* @private
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*/
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this.workspace_ = workspace;
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/**
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* The scroll position of the workspace at the beginning of the drag.
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* Coordinate system: pixel coordinates.
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* @type {!Blockly.utils.Coordinate}
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* @private
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*/
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this.startScrollXY_ = new Blockly.utils.Coordinate(
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workspace.scrollX, workspace.scrollY);
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};
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/**
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* Sever all links from this object.
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* @package
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*/
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Blockly.WorkspaceDragger.prototype.dispose = function() {
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this.workspace_ = null;
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};
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/**
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* Start dragging the workspace.
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* @package
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*/
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Blockly.WorkspaceDragger.prototype.startDrag = function() {
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if (Blockly.selected) {
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Blockly.selected.unselect();
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}
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this.workspace_.setupDragSurface();
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};
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/**
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* Finish dragging the workspace and put everything back where it belongs.
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* @param {!Blockly.utils.Coordinate} currentDragDeltaXY How far the pointer has
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* moved from the position at the start of the drag, in pixel coordinates.
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* @package
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*/
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Blockly.WorkspaceDragger.prototype.endDrag = function(currentDragDeltaXY) {
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// Make sure everything is up to date.
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this.drag(currentDragDeltaXY);
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this.workspace_.resetDragSurface();
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};
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/**
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* Move the workspace based on the most recent mouse movements.
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* @param {!Blockly.utils.Coordinate} currentDragDeltaXY How far the pointer has
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* moved from the position at the start of the drag, in pixel coordinates.
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* @package
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*/
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Blockly.WorkspaceDragger.prototype.drag = function(currentDragDeltaXY) {
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var newXY = Blockly.utils.Coordinate.sum(this.startScrollXY_, currentDragDeltaXY);
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this.workspace_.scroll(newXY.x, newXY.y);
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};
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