On Nov 6, 2008, at 5:28 PM, browser webkit wrote:
In msie/firefox, image map can be TAB focused with outline rendered,
but not under webkit based browser.
So, i start to modify code for test. I found have a mapMouseEvent()
function in HTMLMapElement.cpp, then if i want to implement the TAB
focus in image map, is it necessary to implement a
defaultkeyboardevent() function and other things ?
No, you would not add a new function to handle the keyboard event. The
tab key is implemented for the entire document, not in each node that
participates in tab navigation.
The code that handles navigation with the tab key is in the
FocusController class.
FocusController::advanceFocus
There are also the following key related functions in the Document
class.
Document::nextFocusableNode
Document::previousFocusableNode
Document::setFocusedNode
However, to make image map focusing these functions would have to be
changed. To identify an image map element you need to have both the
image node and the area node inside the map. Because the same image
map can be used with multiple image nodes.
So we'd have to change things so we can track a particular img/area
pair, and then also update the code to understand where these fit in
to the "next focused node" loop and to draw the focus properly.
It's a moderately difficult project.
-- Darin
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