Sakurai/pdf.js
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Enable cancelling of thumbnail drawing

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This is useful if thumbnails are being rendered when the document is rotated, since it let us abort the current rendering.
This commit is contained in:
Jonas Jenwald 2015-01-25 16:59:57 +01:00
parent 878aa76c15
commit b7041f81f4
1 changed files with 41 additions and 16 deletions
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47
web/pdf_thumbnail_view.js
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@ -130,6 +130,9 @@ var PDFThumbnailView = (function PDFThumbnailViewClosure() {
},
reset: function PDFThumbnailView_reset() {
if (this.renderTask) {
this.renderTask.cancel();
}
this.hasImage = false;
this.resume = null;
this.renderingState = RenderingStates.INITIAL;
@ -213,31 +216,53 @@ var PDFThumbnailView = (function PDFThumbnailViewClosure() {
});
var self = this;
function thumbnailDrawCallback(error) {
// The renderTask may have been replaced by a new one, so only remove
// the reference to the renderTask if it matches the one that is
// triggering this callback.
if (renderTask === self.renderTask) {
self.renderTask = null;
}
if (error === 'cancelled') {
rejectRenderPromise(error);
return;
}
self.renderingState = RenderingStates.FINISHED;
if (!error) {
resolveRenderPromise(undefined);
} else {
rejectRenderPromise(error);
}
}
var ctx = this._getPageDrawContext();
var drawViewport = this.viewport.clone({ scale: this.scale });
var renderContext = {
canvasContext: ctx,
viewport: drawViewport,
continueCallback: function renderContinueCallback(cont) {
var renderContinueCallback = function renderContinueCallback(cont) {
if (!self.renderingQueue.isHighestPriority(self)) {
self.renderingState = RenderingStates.PAUSED;
self.resume = function() {
self.resume = function resumeCallback() {
self.renderingState = RenderingStates.RUNNING;
cont();
};
return;
}
cont();
}
};
this.pdfPage.render(renderContext).promise.then(
var renderContext = {
canvasContext: ctx,
viewport: drawViewport,
continueCallback: renderContinueCallback
};
var renderTask = this.renderTask = this.pdfPage.render(renderContext);
renderTask.promise.then(
function pdfPageRenderCallback() {
self.renderingState = RenderingStates.FINISHED;
resolveRenderPromise(undefined);
thumbnailDrawCallback(null);
},
function pdfPageRenderError(error) {
self.renderingState = RenderingStates.FINISHED;
rejectRenderPromise(error);
thumbnailDrawCallback(error);
}
);
return promise;