[Qgis-developer] Qt Minimum Version

[Gavin Macaulay]

Hi,

I've also been thinking that Qt4.2 should be the minimum for Qgis 0.8. It
fixes a number of non-Mac problems as well.

Gavin

> Hi all,
>
> Would it be a problem to make Qt 4.2 the minimum version for QGIS 8.0?
>
> The API has been changed to provide better Mac-compatibility. Moving to
> Qt4.2/Mac without using the new API, however, results in a decline in
> the appearance of Mac buttons.
>
> In Qt4.0/Mac, adjacent buttons that ought to have the same size don't.
> This has been fixed by adding a QDialogButtonBox layout class. Using
> this class, however, will make QGIS unbuildable for < Qt 4.2.
>
> The QMessageBox API has also been changed to support cross-platform
> button layouts. In addition to better looking button sizes on a Mac,
> QDialogButtonBox and the new QMessageBox automatically swap the
> affirmative and cancel buttons so that the affirmative button is on the
> right for a Mac (where it belongs :) ).
>
> Another benefit of Qt4.2/Mac is that a Mac crash when closing the QGIS
> Attribute Table window has been fixed. There is a new Mac crash,
> however, when opening the Vector Properties dialog. Since Raster
> Properties opens ok, it may be a case of needing to update something. I
> have found that removing Qt3 compatibility calls sometimes fixes
> Mac-only problems. Perhaps obsolete Qt4.0 routines are now causing Mac
> problems as well.
>
> Tom
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