Before I impose my personal preferences, and ideas on everyone...,
better see what other opinions are out there.
In 0.9.28 Lazarus has 2 main ways to position the screen when a code
jump occurs:
1) "jump to implementation"
=> the "procedure FooBar" line (or the comment in front of this) is
moved to the top of the editor-window
2) jump to error/bookmar/find-in-files-result,.... / execution-line for
debug (breakpoint, step-over(F8))
=> the line is set to the exact center of the screen
both jumps occur, even if the line is already visible, this leads to a
lot of scrolling.
For [2] this has already been reduced in 0.9.28.
- if the line is visible, and at least (aprox) 5 lines from the
top/bottom of the screen, it will *not* be scrolled
- it the line is visible, but within (aprox) 5 lines from the top/bottom
of the screen, it will be scrolled, so it is just (about) 5 lines from
the top/bottom
- if the line is *not* visible, it is set to dead-center (as in the old
behaviour)
[aprox 5 lines] => minimum 1 / maximum 8 / one fifth of the visble
lines oneach (top/bottom)
( eg 20 visible lines => 20/5 = 4 lines on each side // 60 visible
lines: 8 lines due to maximum)
The reduction of scrolling is especially useful/needed if you use
multiply window/locking:
http://lazarus-dev.blogspot.com/2010/04/page-locking-or-multiply-editor-windows.html
http://wiki.lazarus.freepascal.org/IDE_Window:_Editor_Options_MultiWindow
For [2] this works fine, as described above.
- it works for locked windows
- it works for unlocked windows
(if you enable it, which means a jump do declaration, could leave the
current editor, in favour of an editor showing the declaration)
For [1] it doesn't yet work always.
A) if a locked window exists, showing the desired location, it will
"work" => the window is *not* scrolled
=> setting the topline to "procedure FooBar" is *ignored*
B) if an unlocked window is used (assuming this is switched on) it does
not (not really) work
=> the unlocked window is used, but despite supposedly being at the
right location, it will be scrolled to the topline "procedure FooBar"
---------------------
So how should that work ([1A], [1B])? Any Ideas?
Should a locked (or unlocked) window be used, even if the line, is
nearly at the bottom? You would only see the first line of the
procedure, and that is hardly usable.
Should a window only be used, if the desired topline is:
- exactly correct
- within the upper half of the window (it will *not* be scrolled)
- within the upper xx% of the window (no scrolling)
----
What should happen, if the opline, is to far away from the desired line.
EG:
Procedure FooBar;
procedure Nested;
begin {90 lines of code} end;
begin
// line to jump to
It is not possible to put the procedure header at the top of window:
- apply rules for "if already on screen"
- put "begin" at top
- center "begin"
- (if possible / configurable via option) fold procedure Nested
[this is an option for later]
Best Regards
Martin
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