guys,
I have a draft implementation of a panning (grab and drag) component
(in C++) working quite fine for almost all tested websites. It's not
complicated at all, I'm just working with mouse press/move/release
events of a gtkmozembed browser, and scroll/pan it through some
nsGlobalWindow methods (e.g. ScrollBy).
However, when I try to pan gmail or any other js-based site for example,
the scrollBy method fails because of there is no nsIScrollableView
available.
quoted from nsGlobalWindow.cpp, line 3730
NS_IMETHODIMP
nsGlobalWindow::ScrollBy(PRInt32 aXScrollDif, PRInt32 aYScrollDif)
{
nsresult result;
nsIScrollableView *view = nsnull; /// no addref/release for views/
float p2t, t2p;
FlushPendingNotifications(Flush_Layout);
result = GetScrollInfo(&view, &p2t, &t2p);
*if* (view) {
nscoord xPos, yPos;
result = view->GetScrollPosition(xPos, yPos);
*if* (NS_SUCCEEDED(result)) {
result = ScrollTo(NSTwipsToIntPixels(xPos, t2p) + aXScrollDif,
NSTwipsToIntPixels(yPos, t2p) + aYScrollDif);
printf ("[DEBUGGING ENGINE] nsGlobalWindow::ScrollBy - we have 'view'\n");
}
} *else* printf ("[DEBUGGING ENGINE] there is no view\n");
*return* result;
(...)
That's really odd once I can scroll same sites up/down (through mouse)
via scrollbars without problems. So, my question is: Which other
methods I can use to scroll pages like these (and so improve my panning
component) ? What methods perform scrolling actions via scrollbars ?
Cheers
--Antonio Gomes
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