| [jface.viewers] How do discriminate active and non-active links in ColumnViewer? [message #483159] |
Mon, 31 August 2009 12:19  |
 Daniel Krügler
Messages: 853
Registered: July 2009 |
Senior Member |
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Hi,
I recently needed a table-like ColumnViewer that is capable to
show hyper-links in the column cells. As usually recommended,
I did not embed real hyper-link controls, but instead used
owner-drawn label providers, which are of great advantage
therefore. I could realize both the perfect link color/underlining
as well as mouse cursor changes. You can see that in the code
provided as attachment and you are invited to use it according
to the EPL.
Now my actual question: I would really love to realize an even
more "living" behavior of the links such that it corresponds even
more to that of the hyper-link widgets of SWT. Just open the PDE
editor and move the mouse above such a link, and you will notice
that the color changes during the time the mouse cursor has
switched to the "hand form" between active and non active link
color. I would like to realize the same behavior, even though
I guess that this is probably not trivial. It seems sufficient
to store information of the last active cell, because there can
only be one active cell per column. The question is, how this
information can be represented given the fact that such a table
may be refreshed (not done in the example below). I assume I have
to use this information to return to the previously active cell
and switch that to the inactive color (Viewer.update maybe?)
Besides the question of the backtracking, performance is another
critical issue, because the mouse-form test happens on each mouse-
move. E.g. I could /not/ use Object.equals on the cell elements,
because that could be too costly for the real-objects I have in my
mind. Maybe I should save the last cell item reference?
If anyone has an idea how to realize that, I would be happy
to add his or her contribution to the shared code ;-)
Thanks & Greetings from Bremen,
Daniel Kr
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| Re: [jface.viewers] How do discriminate active and non-active links in ColumnViewer? [message #485524 is a reply to message #483159] |
Sat, 12 September 2009 13:44  |
Thomas Schindl
Messages: 6651
Registered: July 2009 |
Senior Member |
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Hi,
Would you like to make an example out of it an add it to our Snippet
collection?
Then please file a bugzilla under
https://bugs.eclipse.org/bugs/enter_bug.cgi?product=Platform &component=UI&bug_severity=enhancement&rep_platf orm=All&op_sys=All&short_desc=[Snippets]
Tom
Daniel Krügler schrieb:
> Hi,
>
> I recently needed a table-like ColumnViewer that is capable to
> show hyper-links in the column cells. As usually recommended,
> I did not embed real hyper-link controls, but instead used
> owner-drawn label providers, which are of great advantage
> therefore. I could realize both the perfect link color/underlining
> as well as mouse cursor changes. You can see that in the code
> provided as attachment and you are invited to use it according
> to the EPL.
>
> Now my actual question: I would really love to realize an even
> more "living" behavior of the links such that it corresponds even
> more to that of the hyper-link widgets of SWT. Just open the PDE
> editor and move the mouse above such a link, and you will notice
> that the color changes during the time the mouse cursor has
> switched to the "hand form" between active and non active link
> color. I would like to realize the same behavior, even though
> I guess that this is probably not trivial. It seems sufficient
> to store information of the last active cell, because there can
> only be one active cell per column. The question is, how this
> information can be represented given the fact that such a table
> may be refreshed (not done in the example below). I assume I have
> to use this information to return to the previously active cell
> and switch that to the inactive color (Viewer.update maybe?)
>
> Besides the question of the backtracking, performance is another
> critical issue, because the mouse-form test happens on each mouse-
> move. E.g. I could /not/ use Object.equals on the cell elements,
> because that could be too costly for the real-objects I have in my
> mind. Maybe I should save the last cell item reference?
>
> If anyone has an idea how to realize that, I would be happy
> to add his or her contribution to the shared code ;-)
>
> Thanks & Greetings from Bremen,
>
> Daniel Krügler
>
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