Re: [Denemo-devel] new paste

[Richard Shann]

On Wed, 2011-03-02 at 16:30 +0100, Nils Gey wrote:
> Hello Richard,
> 
> I know the clipboard internals since I already wrote a working paste. Please 
> leave the measurebreaks and staffbreaks as they are for now, we need both.
I certainly wasn't offering to change anything there without a very good
reason :)
>  It is possible to live without the staffbreak objects but it will make 
> things more complicated.
> 
> I had written a long story for this mail but I just deleted it. I came up 
> with another idea to handle copy and paste in Scheme without changing the 
> internals.
> 
> With a bit of "luck" the only thing that will need changing is the 
> selection-display for barlines. 
Given a selection (as described in the previous email, ie 6 numbers)
what is the rule for deciding where to mark in blue?
Richard


> I can already say: Barlines need to be marked as selected properly as if 
> there were real objects, because to the clipboard, and therefore to the user, 
> they are real.
> 
> Nils
> 
> 
> 
> On Wed, 02 Mar 2011 10:31:24 +0000
> Richard Shann <address@hidden> wrote:
> 
> > 
> > There is more:
> > Inside Denemo a clipboard (aka clip buffer, cut buffer...) *does*
> > contain objects called MeasureBreaks, which are put there by the d-Copy
> > call (and d-Cut which calls it). Where it places these objects it not
> > known to me, especially what it does when copying measures with no
> > objects. 
> > The code is very flaky here - there are also objects called StaffBreaks
> > inserted but whoever did this code also had the idea of putting the
> > staffs in separate lists, so I think the StaffBreak objects are
> > redundant.
> > 
> > We never display clipboards of course; important not to confuse
> > clipboard with selection.
> > 
> > Richard
> > 
> > 
> > 
> > On Wed, 2011-03-02 at 09:45 +0000, Richard Shann wrote:
> > > Inside Denemo a selection is represented by six numbers:
> > > 
> > > first staff marked
> > > last staff marked
> > > first measure marked
> > > last measure marked
> > > first object marked
> > > last object marked
> > > 
> > > the barlines you refer to are not denemo objects, they are display
> > > artifacts created by the display routines at the end of measures.
> > > 
> > > These numbers start at 1, except if there is no object in a measure when
> > > the object is numbered as 0, otherwise the object numbers are the number
> > > of the object counting from the start of the measure.
> > > 
> > > If you can adopt this model of the representation of selection then we
> > > might be able to make progress on these issues.
> > > 
> > > Given any collection of these numbers, what would you wish the display
> > > to look like?
> > > 
> > > Richard
> > > 
> > > 
> > > 
> > > On Wed, 2011-03-02 at 01:26 +0100, Nils Gey wrote:
> > > > Still more thoughts:
> > > > a) In Singlestaff selection it should be optional if the user selects a 
> > > > barline or not. So the user has the choice to select the first and/or 
> > > > the last barline in a selection. This can be exactly pasted as selected.
> > > > b) In Multistaff selection the first and last barline should be always 
> > > > selected since multistaff always selects whole measures. 
> > > > 
> > > > If this is not possible since barlines in Denemo are something special 
> > > > please say directly and in that case forbid a barline as first copied 
> > > > object as well. (Reminder: This is possible if you select from right to 
> > > > left).
> > > > 
> > > > I expect some confusion about this topic, maybe its better to speak 
> > > > about this in IRC. But un-eqaul behaviours are the problems that make 
> > > > paste hard to do.
> > > > 
> > > > Nils
> > > > 
> > > > 
> > > > On Wed, 2 Mar 2011 01:18:00 +0100
> > > > Nils Gey <address@hidden> wrote:
> > > > 
> > > > > I'm sorry to revert that again. Forwardselection of barlines is only 
> > > > > possible if followed by an empty measure.
> > > > > I request that selecting barlines is possible all the time. Otherwise 
> > > > > paste has try to guess if the user wants a tailing measure break if 
> > > > > he selects a complete measure. This will go wrong in 50% of the 
> > > > > cases, which is not acceptable.
> > > > > So please make it possible that a selection from left to right can 
> > > > > end in a barline.
> > > > > 
> > > > > I hope this is my last change of observation and opinion :)
> > > > > 
> > > > > Nils
> > > > > 
> > > > > On Tue, 1 Mar 2011 19:38:47 +0100
> > > > > Nils Gey <address@hidden> wrote:
> > > > > 
> > > > > > I was wrong about not beeing able to select barlines when selecting 
> > > > > > from left to right. It is possible, just not visible.
> > > > > > So my updated suggestion is to make selected barline and empty 
> > > > > > measures better visible.
> > > > > > 
> > > > > > Nils
> > > > > > 
> > > > > > On Mon, 28 Feb 2011 20:42:35 +0100
> > > > > > Nils Gey <address@hidden> wrote:
> > > > > > 
> > > > > > > hello list,
> > > > > > > 
> > > > > > > I'm currently rewriting paste to be better, faster and easier to 
> > > > > > > maintain.
> > > > > > > 
> > > > > > > 1) I need a function to get the number of staffs in the 
> > > > > > > clipboard. We already have (d-ClipObjects staffnum) but 
> > > > > > > staffcount is unknown to Scheme.
> > > > > > > 
> > > > > > > 2) The drawing of an empty, selected measure is suboptimal. It 
> > > > > > > looks like the beginning of the next right measure is selected.
> > > > > > > 
> > > > > > > 3) If you select backwards it is possible to select a leading 
> > > > > > > barline which is a) not possible if you select forward b) not 
> > > > > > > shown in the selection-drawing. This is confusing but not 
> > > > > > > directly related to paste. The old, current, paste has some tests 
> > > > > > > to ignore those leading barlines but this is not necessary at 
> > > > > > > all. If the user copies a barlines it gets pasted, simple as 
> > > > > > > that. But at least the selection must be shown. I have no opinion 
> > > > > > > about removing the possibility to select leading barlines, or 
> > > > > > > allowing it for a forward selection or leaving it as is, I leave 
> > > > > > > that to someone other to decide. It makes no difference to the 
> > > > > > > user and to paste.
> > > > > > > 
> > > > > > > Nils
> > > > > > > 
> > > > > > > PS. to Richard:
> > > > > > > You said "I notice d-StaffUp extends selection...". This is just 
> > > > > > > correct. If you don't want a selection use d-MoveToStaffUp.
> > > > > > > 
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> > > > > > > 
> > > > > > 
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