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Code Issues Releases Wiki Activity

WebView: keep scrolling left/right

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M66B 2023-02-15 11:52:32 +01:00
parent b52386c1a1
commit 89f2cee08c
1 changed files with 29 additions and 6 deletions
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35
app/src/main/java/eu/faircode/email/WebViewEx.java
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@ -296,7 +296,9 @@ public class WebViewEx extends WebView implements DownloadListener, View.OnLongC
return super.onGenericMotionEvent(event);
}
private float lastX;
private float lastY;
private Integer lastXoff;
@Override
public boolean onTouchEvent(MotionEvent event) {
@ -304,18 +306,39 @@ public class WebViewEx extends WebView implements DownloadListener, View.OnLongC
if (event.getAction() == MotionEvent.ACTION_DOWN)
intercept = true; // Prevent ACTION_CANCEL on fling
else if (event.getAction() == MotionEvent.ACTION_MOVE) {
int range = computeVerticalScrollRange();
int extend = computeVerticalScrollExtent();
boolean canScrollVertical = (range > extend);
int yrange = computeVerticalScrollRange();
int yextend = computeVerticalScrollExtent();
boolean canScrollVertical = (yrange > yextend);
if (canScrollVertical) {
int bottom = range - extend;
int off = computeVerticalScrollOffset();
int bottom = yrange - yextend;
int yoff = computeVerticalScrollOffset();
float dy = lastY - event.getY();
intercept = (off > 0 || dy >= 0) && (off < bottom || dy <= 0);
intercept = (yoff > 0 || dy >= 0) && (yoff < bottom || dy <= 0);
}
if (intercept)
lastXoff = computeHorizontalScrollOffset();
else {
int xrange = computeHorizontalScrollRange();
int xextend = computeHorizontalScrollExtent();
boolean canScrollHorizontal = (xrange > xextend);
//Log.i("MMM xrange=" + xrange + " xextend=" + xextend + " can=" + canScrollHorizontal);
if (canScrollHorizontal) {
int right = xrange - xextend;
int xoff = computeHorizontalScrollOffset();
if (lastXoff == null)
lastXoff = xoff;
float dx = lastX - event.getX();
intercept = (xoff > 0 || dx >= 0) &&
(xoff < right || dx <= 0) &&
(Math.signum(dx) == Math.signum(xoff - lastXoff));
lastXoff = xoff;
}
}
}
getParent().requestDisallowInterceptTouchEvent(intercept || event.getPointerCount() > 1);
lastX = event.getX();
lastY = event.getY();
return super.onTouchEvent(event);
}