Events are delivered to the top level Widget, which then does a hit
test using RenderLayer. RenderLayer will then hit test the
RenderObjects. See RenderLayer::hitTest and RenderObject::hitTest.
The actual RenderObject hit testing is implemented by a virtual
function on RenderObject called nodeAtPoint. If the RenderObject hit
is a RenderWidget, then the event will be passed down to that child
widget by the EventHandler class, and the process repeats.
dave
On Sep 21, 2008, at 5:34 AM, Tau After wrote:
Mark,
Thanks a lot. I'm still wondering how the Mouse/Key events are
associated with the Render Tree? i.e, how thoses events are routed
to every render node?
I saw there is a "Widget" class implemented for different platforms,
and also RenderWidget. seems there is something (specific to mouse
events) happening while building up the render tree?
Thnaks!
-Tau
----- Original Message ----
From: Mark Rowe <[EMAIL PROTECTED]>
To: Tau After <[EMAIL PROTECTED]>
Cc: [email protected]
Sent: Sunday, September 21, 2008 1:16:28 PM
Subject: Re: [webkit-dev] How WebCore receives Mouse events?
On Sep 20, 2008, at 9:18 PM, Tau After wrote:
> Hello,
> Could anybody point me the source code where the WebCore register
> itself with the low layer system to receive the Mouse events? (maybe
> also key events for elements like buttons)
WebCore doesn't register for mouse events, the WebKit layer takes care
of passing mouse events down to WebCore when needed. For example,
when a button is pressed WebKit on Mac
(<http://trac.webkit.org/browser/trunk/WebKit/mac/WebView/WebHTMLView.mm?rev=36685#L3132
>) calls into EventHandler::mouseDown
(<http://trac.webkit.org/browser/trunk/WebCore/page/mac/EventHandlerMac.mm?rev=36685#L474
>), which then calls into the cross-platform
EventHandler::handleMousePressEvent
(<http://trac.webkit.org/browser/trunk/WebCore/page/EventHandler.cpp?rev=36685#L317
>). EventHandler then takes care of the necessary text selection,
dispatch of DOM events, etc.
Hope this helps,
- Mark
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