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/**
* @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 workspace visually.
* @author fenichel@google.com (Rachel Fenichel)
*/
'use strict';
goog.provide('Blockly.WorkspaceDragger');
goog.require('goog.math.Coordinate');
/**
* Class for a workspace dragger. It moves the 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.WorkspaceSvg} workspace The workspace to drag.
* @constructor
*/
Blockly.WorkspaceDragger = function(workspace) {
/**
* @type {!Blockly.WorkspaceSvg}
* @private
*/
this.workspace_ = workspace;
/**
* The scroll position of the workspace at the beginning of the drag.
* Coordinate system: pixel coordinates.
* @type {!goog.math.Coordinate}
* @private
*/
this.startScrollXY_ = new goog.math.Coordinate(
workspace.scrollX, workspace.scrollY);
};
/**
* Sever all links from this object.
* @package
*/
Blockly.WorkspaceDragger.prototype.dispose = function() {
this.workspace_ = null;
};
/**
* Start dragging the workspace.
* @package
*/
Blockly.WorkspaceDragger.prototype.startDrag = function() {
if (Blockly.selected) {
Blockly.selected.unselect();
}
this.workspace_.setupDragSurface();
};
/**
* Finish dragging the workspace and put everything back where it belongs.
* @param {!goog.math.Coordinate} currentDragDeltaXY How far the pointer has
* moved from the position at the start of the drag, in pixel coordinates.
* @package
*/
Blockly.WorkspaceDragger.prototype.endDrag = function(currentDragDeltaXY) {
// Make sure everything is up to date.
this.drag(currentDragDeltaXY);
this.workspace_.resetDragSurface();
};
/**
* Move the workspace based on the most recent mouse movements.
* @param {!goog.math.Coordinate} currentDragDeltaXY How far the pointer has
* moved from the position at the start of the drag, in pixel coordinates.
* @package
*/
Blockly.WorkspaceDragger.prototype.drag = function(currentDragDeltaXY) {
var newXY = goog.math.Coordinate.sum(this.startScrollXY_, currentDragDeltaXY);
this.workspace_.scroll(newXY.x, newXY.y);
};