Hi,
Myself I have never user arrow keys and Page up / Page down shortcuts. Neither
when digitizing nor for layer control. It does not mean that they are
unnecessary, people have different tastes. But for me Shift-Alt-Drag shortcut
for panning and Alt-Left click/Right click for zooming feel better. There may
be cases when arrow keys and PgDown/PgUp might still be better. At least they
make it possible to handle the map view and continue digitising with one hand
only by one-handed operator or by two-handed user driving a car or having a
phone in the other hand on helpdesk. Even in that case the layer list
operations are pretty easy to do with mouse only. For my mind those shortcuts
could be disabled by default. But have a try with one-handed digitising, it's
funny. I started immediately to hunger for two features:
1) Open layers style Click and drag panning
2) Mouse wheel zoom to be operational all the time. Now mouse wheel is
listened only when the traditional zoom or panning tools are selected.
I do not know how difficult those extra features would be to implement. Mouse
wheel is not used for anything else so at least if should not make any confuse.
Click and drag does have a meaning for lots of tools (selecting, moving vertex
or feature, drawing a box or circle etc.) and users might feel it inconvenient
if click and drag is sometimes panning and sometimes doing other things. But
could it be possible to start listening for middle click? Then middle click and
drag could be used for panning always.
-Jukka Rahkonen-
________________________________
Lähettäjä: Larry Becker [mailto:[email protected]]
Lähetetty: 3. helmikuuta 2009 18:09
Vastaanottaja: OpenJump develop and use
Aihe: Re: [JPP-Devel] Pan and Zoom shortcut keys problem
If no one really needs the pan and zoom shortcut keys, we could just
disable InstallKeyPanPlugIn in the default-plugins.xml file. Those who really
need it and are willing to accept the side effects can add it to their
workbench-properties.xml file. Comments?
regards,
Larry
On Thu, Jan 29, 2009 at 1:49 PM, Larry Becker <[email protected]>
wrote:
I now have a pretty complete understanding of the "Pan and Zoom
shortcut keys problem". I have attempted to fix it, but nothing seems to work.
To reiterate the problem, when the arrow and page up/page down keys are used
to move the cursor while editing layer names, they continue to pan and zoom the
layer view. This unexpected behavior also occurs during other arrow key uses
like menu selection. I consider this a "must fix" problem because is makes the
UI unpredictable. Here is what I've found out so far:
1) Pan and Zoom key shortcuts are implemented in a separate
plugin written by Ugo.
2) It uses the WorkBenchFrame#addKeyboardShortcut method (I'm
doing this from memory so don't quote me on the exact name).
3) It implements no checks to determine the context before
executing the shortcut commands.
4) It is possible to add an EnableCheck when the keyboard
shortcut is defined.
5) I have tried several EnableCheck versions, but so far have
not found a way to restrict the pan and zoom behavior to only the layer view.
This seems trivial, but isn't because the methods are called multiple times
with different panels "active".
6) The LayerNamePanel and the LayerViewPanel are implemented as
JSplitPane panels under the TaskFrame.
7) Here is the real problem: There doesn't seem to be a
definition in Java of "front most" component in a split pane, so both panels
get all of the key events.
8) In order to fix the problem it is necessary to restrict the
scope of the pan and zoom keyboard shortcuts.
9) I could not find a way to ensure that the LayerViewPanel is
"not active" when the task window active. I'm not even sure if this would be a
good idea.
10) Unless someone can see a way out of this trap, it doesn't
look like the problem has a code solution.
The floor is open for alternative solutions. We could, for
instance, check for less often used key combinations like control-arrow which
might minimize the conflicts.
regards,
Larry
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