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a17cb7f12e
* introduce IDraggable interface * Add parameter to drag methods in IDragTarget * combines bubble/drag methods on IDragTarget and IDeleteArea to take an IDraggable element
89 lines
2.4 KiB
JavaScript
89 lines
2.4 KiB
JavaScript
/**
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* @license
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* Copyright 2021 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @fileoverview The abstract class for a component with custom behaviour when a
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* block or bubble is dragged over or dropped on top of it.
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* @author kozbial@google.com (Monica Kozbial)
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*/
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'use strict';
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goog.provide('Blockly.DragTarget');
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goog.require('Blockly.IDragTarget');
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goog.requireType('Blockly.IDraggable');
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goog.requireType('Blockly.utils.Rect');
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/**
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* Abstract class for a component with custom behaviour when a block or bubble
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* is dragged over or dropped on top of it.
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* @implements {Blockly.IDragTarget}
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* @constructor
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*/
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Blockly.DragTarget = function() {};
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/**
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* Returns the bounding rectangle of the drag target area in pixel units
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* relative to the Blockly injection div.
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* @return {?Blockly.utils.Rect} The component's bounding box. Null if drag
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* target area should be ignored.
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*/
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Blockly.DragTarget.prototype.getClientRect;
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/**
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* Handles when a cursor with a block or bubble enters this drag target.
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* @param {!Blockly.IDraggable} _dragElement The block or bubble currently being
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* dragged.
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*/
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Blockly.DragTarget.prototype.onDragEnter = function(_dragElement) {
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// no-op
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};
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/**
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* Handles when a cursor with a block or bubble is dragged over this drag
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* target.
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* @param {!Blockly.IDraggable} _dragElement The block or bubble currently being
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* dragged.
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*/
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Blockly.DragTarget.prototype.onDragOver = function(_dragElement) {
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// no-op
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};
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/**
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* Handles when a cursor with a block or bubble exits this drag target.
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* @param {!Blockly.IDraggable} _dragElement The block or bubble currently being
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* dragged.
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*/
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Blockly.DragTarget.prototype.onDragExit = function(_dragElement) {
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// no-op
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};
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/**
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* Handles when a block or bubble is dropped on this component.
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* Should not handle delete here.
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* @param {!Blockly.IDraggable} _dragElement The block or bubble currently being
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* dragged.
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*/
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Blockly.DragTarget.prototype.onDrop = function(_dragElement) {
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// no-op
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};
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/**
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* Returns whether the provided block or bubble should not be moved after being
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* dropped on this component. If true, the element will return to where it was
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* when the drag started.
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* @param {!Blockly.IDraggable} _dragElement The block or bubble currently being
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* dragged.
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* @return {boolean} Whether the block or bubble provided should be returned to
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* drag start.
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*/
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Blockly.DragTarget.prototype.shouldPreventMove = function(_dragElement) {
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return false;
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};
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