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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @typedef {{
* callback: function(Object, Object):void,
* params: Object
* }}
*/
let TransformPagePointRequest;
/**
* @typedef {{
* type: string,
* id: number,
* page: number,
* x: number,
* y: number
* }}
*/
let TransformPagePointMessage;
(function() {
'use strict';
/**
* Transforms page to screen coordinates using messages to the plugin.
*/
window.PDFCoordsTransformer = class {
constructor(postMessageCallback) {
/** @private {!Map<number,!TransformPagePointRequest>} */
this.outstandingTransformPagePointRequests_ = new Map();
/** @private {function(TransformPagePointMessage):void} */
this.postMessageCallback_ = postMessageCallback;
/** @private {number} */
this.nextId_ = 0;
}
/**
* Send a 'transformPagePoint' message to the plugin.
*
* @param {function(Object, Object):void} callback Function to call when the
* response is received.
* @param {Object} params User parameters to be used in |callback|.
* @param {number} page 0-based page number of the page where the point is.
* @param {number} x x coordinate of the point.
* @param {number} y y coordinate of the point.
*/
request(callback, params, page, x, y) {
this.outstandingTransformPagePointRequests_.set(
this.nextId_, {callback: callback, params: params});
this.postMessageCallback_(
{type: 'transformPagePoint', id: this.nextId_, page: page, x: x, y: y});
this.nextId_++;
}
/**
* Call when 'transformPagePointReply' is received from the plugin.
*
* @param {Object} message The message received from the plugin.
*/
onReplyReceived(message) {
const outstandingRequest =
this.outstandingTransformPagePointRequests_.get(message.data.id);
this.outstandingTransformPagePointRequests_.delete(message.data.id);
outstandingRequest.callback(message.data, outstandingRequest.params);
}
};
}());
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