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Implement progressive loading of PDFs

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Mack Duan 2013-02-06 15:19:29 -08:00
parent added3da8f
commit ef423ef30c
25 changed files with 2110 additions and 586 deletions
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69
src/api.js
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@ -35,9 +35,13 @@
* - httpHeaders - Basic authentication headers.
* - password - For decrypting password-protected PDFs.
*
* @param {object} pdfDataRangeTransport is optional. It is used if you want
* to manually serve range requests for data in the PDF. See viewer.js for
* an example of pdfDataRangeTransport's interface.
*
* @return {Promise} A promise that is resolved with {PDFDocumentProxy} object.
*/
PDFJS.getDocument = function getDocument(source) {
PDFJS.getDocument = function getDocument(source, pdfDataRangeTransport) {
var workerInitializedPromise, workerReadyPromise, transport;
if (typeof source === 'string') {
@ -64,7 +68,8 @@ PDFJS.getDocument = function getDocument(source) {
workerInitializedPromise = new PDFJS.Promise();
workerReadyPromise = new PDFJS.Promise();
transport = new WorkerTransport(workerInitializedPromise, workerReadyPromise);
transport = new WorkerTransport(workerInitializedPromise,
workerReadyPromise, pdfDataRangeTransport);
workerInitializedPromise.then(function transportInitialized() {
transport.fetchDocument(params);
});
@ -114,10 +119,7 @@ var PDFDocumentProxy = (function PDFDocumentProxyClosure() {
* mapping named destinations to reference numbers.
*/
getDestinations: function PDFDocumentProxy_getDestinations() {
var promise = new PDFJS.Promise();
var destinations = this.pdfInfo.destinations;
promise.resolve(destinations);
return promise;
return this.transport.getDestinations();
},
/**
* @return {Promise} A promise that is resolved with an array of all the
@ -180,6 +182,13 @@ var PDFDocumentProxy = (function PDFDocumentProxyClosure() {
this.transport.getData(promise);
return promise;
},
/**
* @return {Promise} A promise that is resolved when the document's data
* is loaded
*/
dataLoaded: function PDFDocumentProxy_dataLoaded() {
return this.transport.dataLoaded();
},
destroy: function PDFDocumentProxy_destroy() {
this.transport.destroy();
}
@ -462,7 +471,10 @@ var PDFPageProxy = (function PDFPageProxyClosure() {
* For internal use only.
*/
var WorkerTransport = (function WorkerTransportClosure() {
function WorkerTransport(workerInitializedPromise, workerReadyPromise) {
function WorkerTransport(workerInitializedPromise, workerReadyPromise,
pdfDataRangeTransport) {
this.pdfDataRangeTransport = pdfDataRangeTransport;
this.workerReadyPromise = workerReadyPromise;
this.commonObjs = new PDFObjects();
@ -544,6 +556,21 @@ var WorkerTransport = (function WorkerTransportClosure() {
function WorkerTransport_setupMessageHandler(messageHandler) {
this.messageHandler = messageHandler;
var pdfDataRangeTransport = this.pdfDataRangeTransport;
if (pdfDataRangeTransport) {
pdfDataRangeTransport.addListener(function(begin, chunk) {
messageHandler.send('OnDataRange', {
begin: begin,
chunk: chunk
});
});
messageHandler.on('RequestDataRange',
function transportDataRange(data) {
pdfDataRangeTransport.requestDataRange(data.begin, data.end);
}, this);
}
messageHandler.on('GetDoc', function transportDoc(data) {
var pdfInfo = data.pdfInfo;
var pdfDocument = new PDFDocumentProxy(pdfInfo, this);
@ -647,6 +674,10 @@ var WorkerTransport = (function WorkerTransportClosure() {
}, this);
messageHandler.on('DocProgress', function transportDocProgress(data) {
// TODO(mack): The progress event should be resolved on a different
// promise that tracks progress of whole file, since workerReadyPromise
// is for file being ready to render, not for when file is fully
// downloaded
this.workerReadyPromise.progress({
loaded: data.loaded,
total: data.total
@ -702,7 +733,11 @@ var WorkerTransport = (function WorkerTransportClosure() {
},
fetchDocument: function WorkerTransport_fetchDocument(source) {
this.messageHandler.send('GetDocRequest', {source: source});
source.chunkedViewerLoading = !!this.pdfDataRangeTransport;
this.messageHandler.send('GetDocRequest', {
source: source,
disableRange: PDFJS.disableRange
});
},
getData: function WorkerTransport_getData(promise) {
@ -711,6 +746,14 @@ var WorkerTransport = (function WorkerTransportClosure() {
});
},
dataLoaded: function WorkerTransport_dataLoaded() {
var promise = new PDFJS.Promise();
this.messageHandler.send('DataLoaded', null, function(args) {
promise.resolve(args);
});
return promise;
},
getPage: function WorkerTransport_getPage(pageNumber, promise) {
var pageIndex = pageNumber - 1;
if (pageIndex in this.pagePromises)
@ -724,6 +767,16 @@ var WorkerTransport = (function WorkerTransportClosure() {
getAnnotations: function WorkerTransport_getAnnotations(pageIndex) {
this.messageHandler.send('GetAnnotationsRequest',
{ pageIndex: pageIndex });
},
getDestinations: function WorkerTransport_getDestinations() {
var promise = new PDFJS.Promise();
this.messageHandler.send('GetDestinations', null,
function transportDestinations(destinations) {
promise.resolve(destinations);
}
);
return promise;
}
};
return WorkerTransport;