@SmallTest
@Feature({"AndroidWebView"})
public void testUiScrollReflectedInJs() throws Throwable {
final TestAwContentsClient contentsClient = new TestAwContentsClient();
final ScrollTestContainerView testContainerView =
(ScrollTestContainerView) createAwTestContainerViewOnMainSync(contentsClient);
enableJavaScriptOnUiThread(testContainerView.getAwContents());
final double deviceDIPScale =
DeviceDisplayInfo.create(testContainerView.getContext()).getDIPScale();
final int targetScrollXCss = 233;
final int targetScrollYCss = 322;
final int targetScrollXPix = (int) Math.ceil(targetScrollXCss * deviceDIPScale);
final int targetScrollYPix = (int) Math.ceil(targetScrollYCss * deviceDIPScale);
final JavascriptEventObserver onscrollObserver = new JavascriptEventObserver();
getInstrumentation()
.runOnMainSync(
new Runnable() {
@Override
public void run() {
onscrollObserver.register(
testContainerView.getContentViewCore(), "onscrollObserver");
}
});
loadTestPageAndWaitForFirstFrame(testContainerView, contentsClient, "onscrollObserver", "");
scrollToOnMainSync(testContainerView, targetScrollXPix, targetScrollYPix);
onscrollObserver.waitForEvent(WAIT_TIMEOUT_MS);
assertScrollInJs(
testContainerView.getAwContents(), contentsClient, targetScrollXCss, targetScrollYCss);
}
private void loadTestPageAndWaitForFirstFrame(
final ScrollTestContainerView testContainerView,
final TestAwContentsClient contentsClient,
final String onscrollObserverName,
final String extraContent)
throws Exception {
final JavascriptEventObserver firstFrameObserver = new JavascriptEventObserver();
final String firstFrameObserverName = "firstFrameObserver";
enableJavaScriptOnUiThread(testContainerView.getAwContents());
getInstrumentation()
.runOnMainSync(
new Runnable() {
@Override
public void run() {
firstFrameObserver.register(
testContainerView.getContentViewCore(), firstFrameObserverName);
}
});
loadDataSync(
testContainerView.getAwContents(),
contentsClient.getOnPageFinishedHelper(),
makeTestPage(onscrollObserverName, firstFrameObserverName, extraContent),
"text/html",
false);
// We wait for "a couple" of frames for the active tree in CC to stabilize and for pending
// tree activations to stop clobbering the root scroll layer's scroll offset. This wait
// doesn't strictly guarantee that but there isn't a good alternative and this seems to
// work fine.
firstFrameObserver.waitForEvent(WAIT_TIMEOUT_MS);
}