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Make image zoom fetch requests cancellable. Issue #1178

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This commit is contained in:
Maurice Parker 2019-10-30 11:06:55 -05:00
parent 9de38b00b9
commit fe7f6bb8df
2 changed files with 28 additions and 14 deletions
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5
iOS/Article/ArticleViewController.swift
View File

@ -85,6 +85,9 @@ class ArticleViewController: UIViewController {
deinit {
if webView != nil {
webView?.evaluateJavaScript("cancelImageLoad();")
webView.configuration.userContentController.removeScriptMessageHandler(forName: MessageName.imageWasClicked)
webView.configuration.userContentController.removeScriptMessageHandler(forName: MessageName.imageWasShown)
webView.removeFromSuperview()
ArticleViewControllerWebViewProvider.shared.enqueueWebView(webView)
webView = nil
@ -109,8 +112,6 @@ class ArticleViewController: UIViewController {
webView.navigationDelegate = self
webView.uiDelegate = self
webView.configuration.userContentController.removeScriptMessageHandler(forName: MessageName.imageWasClicked)
webView.configuration.userContentController.removeScriptMessageHandler(forName: MessageName.imageWasShown)
webView.configuration.userContentController.add(WrapperScriptMessageHandler(self), name: MessageName.imageWasClicked)
webView.configuration.userContentController.add(WrapperScriptMessageHandler(self), name: MessageName.imageWasShown)

37
iOS/Resources/main_ios.js
View File

@ -1,23 +1,37 @@
var imageIsLoading = false;
var controller = new AbortController()
// Cancel any pending image loads (there might be none) and reset the controller
function cancelImageLoad() {
controller.abort();
controller = new AbortController();
}
// Used to pop a resizable image view
async function imageWasClicked(img) {
img.classList.add("nnwClicked");
cancelImageLoad();
showNetworkLoading(img);
try {
showNetworkLoading(img);
const response = await fetch(img.src);
const signal = controller.signal;
const response = await fetch(img.src, { signal: signal });
if (!response.ok) {
throw new Error('Network response was not ok.');
}
const imgBlob = await response.blob();
if (signal.aborted) {
throw new Error('Network response was aborted.');
}
hideNetworkLoading(img);
var reader = new FileReader();
reader.readAsDataURL(imgBlob);
reader.onloadend = function() {
img.classList.add("nnwClicked");
const rect = img.getBoundingClientRect();
var message = {
x: rect.x,
@ -29,8 +43,9 @@ async function imageWasClicked(img) {
var jsonMessage = JSON.stringify(message);
window.webkit.messageHandlers.imageWasClicked.postMessage(jsonMessage);
}
} catch (error) {
hideNetworkLoading(img);
console.log('There has been a problem with your fetch operation: ', error.message);
@ -39,7 +54,6 @@ async function imageWasClicked(img) {
}
function showNetworkLoading(img) {
imageIsLoading = true;
var wrapper = document.createElement("div");
wrapper.classList.add("activityIndicatorWrap");
@ -64,8 +78,6 @@ function hideNetworkLoading(img) {
var wrapperParent = wrapper.parentNode;
wrapperParent.insertBefore(img, wrapper);
wrapperParent.removeChild(wrapper);
imageIsLoading = false;
}
// Used to animate the transition to a fullscreen image
@ -85,7 +97,7 @@ function showClickedImage() {
// Add the click listener for images
function imageClicks() {
window.onclick = function(event) {
if (event.target.matches('img') && !imageIsLoading) {
if (event.target.matches('img')) {
imageWasClicked(event.target);
}
}
@ -101,8 +113,9 @@ function inlineVideos() {
}
function postRenderProcessing() {
imageClicks()
inlineVideos()
cancelImageLoad();
imageClicks();
inlineVideos();
}
const activityIndicator = "data:image/svg+xml;base64,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";