Darin Adler 写道: > 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 > > _______________________________________________ > webkit-dev mailing list > [email protected] > http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev > Thanks Darin
Follow u suggesion, i did some work, but not solved. Before list, i assume html page have only one <img> and <map>(also one <area>) tag, but also they are bounded. In order to focus navigate via tab, i did follow things. 1 to identify <img>,<area> tag I can get the <img> or <area> node from Document::nextFocusableNode Document::previousFocusableNode. 2 get absolutely position Also, i had got the position of the <img> and each <area> node with nonstandard way, in any way. If i use areaNode->renderer(), i will got NULL. I didn't know the reason.If u can, tell me more. 3 to focus <area> node In this step, i fail to focus the <area> node, moreover didn't see the focus ring. And i found the <area> node never pass through the isKeyboardFocusable() function. So, some questions <1> I want to know the factor that a node need be focusable, just like <area> node. <2> Can i render the focus ring, when i got the <area> node and it's absolutely postion ? thanks again _______________________________________________ webkit-dev mailing list [email protected] http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
