[Bug 157314] New: Zoom-slider has no steps

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[Bug 157314] New: Zoom-slider has no steps

Paristo
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http://bugs.kde.org/show_bug.cgi?id=157314         
           Summary: Zoom-slider has no steps
           Product: digikam
           Version: 0.9.3
          Platform: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel kde org
        ReportedBy: Paristo Gmail com


Version:           0.9.3 (using KDE 3.5.8)
OS:                Linux

Currently digikam zoom-slider on different windows does not have any steps, it is dificult to get 100% zoom ration from a "fit-to-window" picture. If user clicks "zoom in" button, zoom ration goes over 100%.

Suggestion that zoom-slider would get few stops like every 2% or 5% so it would be easy to stop to 100% zoom, mayby add just one stop to that position. Then it would be like a fit-100%-fullzoom and user could still zoom between all these three positions easily.

It seems when user scrolls mouse wheel over zoom-slider, he gets different zoom steps for everytime when going back/forward
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[Bug 157314] Zoom-slider has no steps

Gilles Caulier-4
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http://bugs.kde.org/show_bug.cgi?id=157314         
caulier.gilles gmail com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|general                     |Image Editor
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[Bug 157314] Zoom-slider has no steps

Arnd Baecker
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------- Additional Comments From arnd.baecker web de  2008-04-18 18:09 -------
Created an attachment (id=24391)
 --> (http://bugs.kde.org/attachment.cgi?id=24391&action=view)
make zoom values snap to specific values, v0

The patch works for the + and - buttons at the slider,
CTRL+mousewheel and changes of the slider itself.

For dealing with changes of the slider itself,
modifying PreviewWidget::setZoomFactor a la

  //If we are near 100% zoom, then we force 100% zoom
      if (fabs(zoom-1.0)<0.05)
    {
        zoom = 1.0;
    }
(as done in the previous patch on the ML) is not a good idea.
Reason: this routine is used at various places throughout the code.
In particular, when a fit-to-window would be 96% then this should not
be set to 100% automatically, just because of 100% snapping .... ;-)

Also, if the user changed the ZoomText
(e.g.: EditorWindow::slotZoomTextChanged)
this must not be changed afterwards ;-)

To deal with the slider, the places to be adapted are:

#void DigikamView::setThumbSize(int size)
void ImagePannelWidget::slotZoomSliderChanged(int size)
void LightTableView::slotLeftZoomSliderChanged(int size)
void LightTableView::slotRightZoomSliderChanged(int size)

All these call setZoomFactor(z) in the end.
Therefore, instead a setZoomFactorSnapped(z) is
introduced, which does the proper handling of "snapping"
to 50%, 100% and fit-to-window.

Of course, this needs testing - feedback welcome!
(Once everything is considered fine, I will clean up the few DWarning()
statements left in for debugging)

Best, Arnd
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[Bug 157314] Zoom-slider has no steps

Bugzilla from mikmach@wp.pl
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------- Additional Comments From mikmach wp pl  2008-04-19 00:03 -------
Thanks. Now buttons works :)
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[Bug 157314] Zoom-slider has no steps

Bugzilla from mikmach@wp.pl
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------- Additional Comments From mikmach wp pl  2008-04-19 10:07 -------
Dnia Saturday 19 of April 2008, napisa�e�:

> Hi Mik,
>
> quick off-line question: did you check all situations
> (full vs. small preview, light-table, etc.),
> for moving the slider, pressing the buttons, and using CTRL+Mouse+wheel?
>
> It should snap to 50 %, 100% and fit-to-window....
>
> I am asking, because the implementation is completely different
> from the previous patch .... ;-)

Works always with buttons.
Works with Ctrl+Mouse-wheel
Doesn't work with Mouse-wheel hovering over slider.

On a related note: after finishing with Preview mode it would be nice to
make it work similarly in Image Editor. 100% zooming works there but
neither 'fit in window' nor 50%.

I noticed serious usability bug:

When zooming in with Mouse-wheel over slider you have to drag finger
toward yourself, but for zooming in with Ctrl+Mouse-wheel you have to
move finger in opposite direction.

m.

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[Bug 157314] Zoom-slider has no steps

Arnd Baecker
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------- Additional Comments From arnd.baecker web de  2008-04-19 14:14 -------
1.) > Doesn't work with Mouse-wheel hovering over slider.

Both when moving the slider and when using the mouse wheel,
void DigikamView::slotZoomFactorChanged(double zoom)
is called, which in turn calls void DigikamView::setThumbSize(int size).
Thus the problem is the following: when moving the slider directly,
usually small steps are are used such that a maximum 5%
difference condition to the snap values (50%, 100%, fit) is fulfilled
to make it snap. When using the mouse-wheel, larger steps are
used, so that it may happen, that no snapping occurs.
This maybe considered as a bug, or as a feature ;-).
However, I currently don't see any way to overcome this ...
So may I declare this as a feature?

About the other two points: could you please file separate wishes?
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[Bug 157314] Zoom-slider has no steps

Arnd Baecker
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arnd.baecker web de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #24391|0                           |1
        is obsolete|                            |



------- Additional Comments From arnd.baecker web de  2008-04-19 14:22 -------
Created an attachment (id=24404)
 --> (http://bugs.kde.org/attachment.cgi?id=24404&action=view)
make zoom values snap to specific values, v1

cleaned up patch.

Gilles, could you have a brief look at the code?
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[Bug 157314] Zoom-slider has no steps

Gilles Caulier-4
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------- Additional Comments From caulier.gilles gmail com  2008-04-23 08:46 -------
Arnd,

Patch is fine for me. Just remove the #include <stdlib.h> from top of imagepreview.cpp...

C Ansi header must be limited if possible to improve portability.

Another tip : if you really need to use C Ansi header, i recommend to always use C++ header instead, we it's possible (it not always the case). For ex.:

#include <math.h> ==> #include <cmath>

C++ header don't use .h extension and generally add 'c' char on front of file name.

Note than not all C Ansi header file have been converter to C++ like (for Ex. #include <stdint.h>). In this case the C Ansi header need to be wrapped around "extern "C" {...}"...

Gilles
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[Bug 157314] Zoom-slider has no steps

Arnd Baecker
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------- Additional Comments From arnd.baecker web de  2008-04-23 20:22 -------
SVN commit 800239 by abaecker:

Make the zoom values of the slider snap to specific values
(fit-to-window, 50% view, and 100% view).

CCBUGS: 157314
TODO:KDE4PORT



 M  +2 -1      NEWS  
 M  +5 -0      digikam/albumwidgetstack.cpp  
 M  +1 -0      digikam/albumwidgetstack.h  
 M  +1 -1      digikam/digikamview.cpp  
 M  +62 -2     libs/widgets/common/previewwidget.cpp  
 M  +3 -0      libs/widgets/common/previewwidget.h  
 M  +1 -1      libs/widgets/imageplugins/imagepannelwidget.cpp  
 M  +2 -2      utilities/lighttable/lighttableview.cpp  


WebSVN link: http://websvn.kde.org/?view=rev&revision=800239
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[Bug 157314] Zoom-slider has no steps

Arnd Baecker
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------- Additional Comments From arnd.baecker web de  2008-04-23 20:33 -------
Gilles, thanks for the review -
the #include <stdlib.h> was indeed a left-over from testing ...

I think that the main point of the wish is fulfilled.

The same will have to be done for the image editor, see
http://bugs.kde.org/show_bug.cgi?id=161085
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[Bug 157314] Zoom-slider has no steps

Gilles Caulier-4
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------- Additional Comments From caulier.gilles gmail com  2008-04-24 08:43 -------
Arnd,

I will take a look into 161085.

Note look here about C Ansi header and C++:

http://www.cs.sunysb.edu/facilities/FAQ/gccfaq/standard_header_files.html

Gilles
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[Bug 157314] Zoom-slider has no steps

Gilles Caulier-4
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------- Additional Comments From caulier.gilles gmail com  2008-04-24 09:20 -------
Arnd,

Qt3 => Qt4 port feedback :

QValueList<double> ==> QList<double>
qHeapSort(QValueList<double>) ==> qSort(QList<double>)

Gilles
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[Bug 157314] Zoom-slider has no steps

Gilles Caulier-4
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caulier.gilles gmail com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED



------- Additional Comments From caulier.gilles gmail com  2008-04-24 09:22 -------
SVN commit 800397 by cgilles:

backport commit #800239 from KDE3 branch
BUG: 157314


 M  +5 -0      digikam/albumwidgetstack.cpp  
 M  +1 -0      digikam/albumwidgetstack.h  
 M  +7 -7      digikam/digikamview.cpp  
 M  +63 -3     libs/widgets/common/previewwidget.cpp  
 M  +4 -1      libs/widgets/common/previewwidget.h  
 M  +1 -1      libs/widgets/imageplugins/imagepannelwidget.cpp  
 M  +3 -3      utilities/lighttable/lighttableview.cpp  
 M  +1 -1      utilities/lighttable/lighttableview.h  


WebSVN link: http://websvn.kde.org/?view=rev&revision=800397
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