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86 lines
2.8 KiB
JavaScript
86 lines
2.8 KiB
JavaScript
/**
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* @license
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* Visual Blocks Editor
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*
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* Copyright 2017 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 Methods for dragging a flyout 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.FlyoutDragger');
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goog.require('Blockly.WorkspaceDragger');
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/**
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* Class for a flyout dragger. It moves a flyout 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.Flyout} flyout The flyout to drag.
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* @constructor
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*/
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Blockly.FlyoutDragger = function(flyout) {
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Blockly.FlyoutDragger.superClass_.constructor.call(this,
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flyout.getWorkspace());
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/**
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* The scrollbar to update to move the flyout.
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* Unlike the main workspace, the flyout has only one scrollbar, in either the
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* horizontal or the vertical direction.
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* @type {!Blockly.Scrollbar}
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* @private
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*/
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this.scrollbar_ = flyout.scrollbar_;
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/**
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* Whether the flyout scrolls horizontally. If false, the flyout scrolls
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* vertically.
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* @type {boolean}
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* @private
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*/
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this.horizontalLayout_ = flyout.horizontalLayout_;
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};
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goog.inherits(Blockly.FlyoutDragger, Blockly.WorkspaceDragger);
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/**
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* Move the flyout 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.FlyoutDragger.prototype.drag = function(currentDragDeltaXY) {
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// startScrollXY_ is assigned by the superclass.
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var newXY = Blockly.utils.Coordinate.sum(this.startScrollXY_, currentDragDeltaXY);
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// We can't call workspace.scroll because the flyout's workspace doesn't own
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// it's own scrollbars. This is because (as of 2.20190722.1) the
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// workspace's scrollbar property must be a scrollbar pair, rather than a
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// single scrollbar.
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// Instead we'll just expect setting the scrollbar to update the scroll of
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// the workspace as well.
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if (this.horizontalLayout_) {
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this.scrollbar_.set(-newXY.x);
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} else {
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this.scrollbar_.set(-newXY.y);
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}
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};
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