Reviewed by Antti.
- fix <rdar://problem/4889753> REGRESSION: Selection doesn't continue with drag selecting
when autoscrolling vertically (in Notes as well as Safari)
The bug doesn't happen inside DumpRenderTree, so I was unable to make an automated
regression test.
* manual-tests/autoscroll-when-outside-window.html: Added.
* rendering/RenderLayer.cpp: (WebCore::RenderLayer::autoscroll): Removed unneeded null
check for the layer's renderer and the document, neither of which can be null. Call
the new updateSelectionForMouseDrag instead of doing selection updating here.
* page/EventHandler.h:
* page/EventHandler.cpp:
(WebCore::EventHandler::handleMouseDraggedEvent): Refactored most of the logic
about updating the selection into updateSelectionForMouseDrag.
(WebCore::EventHandler::updateSelectionForMouseDrag): Added. The public version of
this function takes no parameters, and is for use from auto-scrolling code. The
private version of this function takes node and point parameters and contains the
shared code, including everything from updateSelectionForMouseDragOverPosition.
Aside from the code motion, variable name changes, and sharing more code, this
differs from the old code in RenderLayer::autoscroll in the following ways:
1) The old code did hit testing only in the layer that was auto-scrolling,
and the new code instead starts the hit testing at the root layer, which is
better because it's the same thing we do for mouse moved events. Further,
the code to do this by calling convertToLayerCoords had a bug because the
x and y variables were uninitialized.
2) The old code passed false for active to HitTestRequest, which was wrong.
The new code passes true. This flag needs to be true for hit testing done
while the mouse is down and false for hit testing done while the mouse is up.
3) The old code did not have the SVG-specific logic to match the mouse moved case.
4) The old code wouldn't do any selection updating if the return value from hitTest
was false, which is incorrect. The new code ignores the return value as it should.
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@24957 268f45cc-cd09-0410-ab3c-d52691b4dbfc
diff --git a/WebCore/manual-tests/autoscroll-when-outside-window.html b/WebCore/manual-tests/autoscroll-when-outside-window.html
new file mode 100644
index 0000000..91b4ecf
--- /dev/null
+++ b/WebCore/manual-tests/autoscroll-when-outside-window.html
@@ -0,0 +1,7 @@
+<html>
+ <body>
+ <p>Click somewhere in this text, then quickly drag past the bottom of the window and hold still to allow auto-scrolling to happen.</p>
+ <div style="height:3000px"></div>
+ <p>If the bug occurs, then this text won't be selected until you move the mouse slightly. If the bug does not occur, this text should be selected.</p>
+ </body>
+</html>
