koffice/krita/ui/tests

[Boudewijn Rempt]

On Tue, 22 Jun 2010, Dmitry Kazakov wrote:

> > > > Maybe we can do something using the tool activation/deactivation (or a
> > > > timer
> > > > > with a pause) that commits the complete transform in one action.
> > > >
> > > > Timer :(. I'm afraid we will end up with the same undo stack signals. I
> > > > think we need a button (big and red! :) ) that will end transformation,
> > > > commit it into the stack and remove "hands" from the canvas. After
> > pressing
> > > > this button, editing of the previous transformation will not be
> > possible.
> > >
> > > No, I wouldn't go for the big button. Other apps manage to work without a
> > big
> > > button, we must be able to find a way to do this right as well.
> >
> > I don't know about that either, but that's the way photoshop's transform
> > tool works : it creates a temporary copy of the selection, then the user
> > can work directly on this copy, which is degraded for each
> > transformation. When the user pushes a validation button, all the
> > transformations are reduced and applied to the original selection (to
> > have as little degradation as possible°;
> >
> 
> That is exactly what i thought about! :)
> 
> We do already have an overlay QImage, afair... But how will we deal with
> multilayer images? What if the tool is applied to the lowest layer?
> 

We don't have an overlay QImage, but tools get a QPainter to paint their
decorations. The transform tool can use that. What I can conceive of is that
we paint the transformed content in a QImage on top of the image, even if
it comes from a lower layer, but that we show the image itself with some 
transparency, to make clear it's a temporary display.

Boudewijn