[squeak-dev] Faster window drag for Morphic

karl ramberg karlramberg at gmail.com
Sun Jun 5 15:10:27 UTC 2022

There are different preferences acting here:

'System window embed ok' affects dropping windows on a PasteUpMorph or a
When preference is true, SystemWindows drops into the morph.
Sometimes useful, other times not what you want. This is probably not what
you see in this case.

'Browse with drag 'n' drop' and 'Draggable Text Selections'
You can drag a text selection to another text pane or a list item to
another list.
SystemWindows could here reject all other mouseOverDragging events than
dragging TransferMorphs if the SystemWindows dropEnable is false.
See SystemWindow>>mouseEnterDragging:


On Sat, Jun 4, 2022 at 9:56 PM Tim Johnson <digit at sonic.net> wrote:

> Hi Marcel, all,
> Regarding the behavior of Browsers (etc.) becoming active when other
> tool-type windows are dragged over them and Fast Window Dragging is turned
> off:  why does this happen even when "drop in" (this used to be called
> "accept drops"*) is disabled?
> I recall the argument being made that the window can't know if any of its
> submorphs want the drop.  But doesn't the parent morph's "accept drops"
> setting take precedence over child morphs?  Or am I mistakenly applying
> non-Morphic logic to Morphic?  Not super clear from reading
> http://wiki.squeak.org/squeak/6194 .  (The practical implications of this
> are interesting to think about... and probably have been for years.  :) )
> There was a message posted to another thread on this list around the time
> I brought this up in which I detected (perhaps incorrectly) a sort-of
> "eye-rolling" tone (e.g. "ha ha, who would want to drop Workspaces into
> Browsers, amiright? ha ha [they don't know what they're missing!]").  This
> suggests to me that there must be other projects in Squeak which find it
> useful to have this behavior in the default configuration of the shipping
> image.  But what are those use cases?  Certainly it's not about
> "teleportation"-style morphs or any other custom windows which could have
> "accept drops" turned on and are not Browsers or Workspaces.  There must be
> some reason it's useful to have this behavior in the default shipping image
> even though (1) it slows down performance/introduces visible lag, (2) it
> seems (to me) to be a minority use case that e.g. a Workspace would be
> dropped onto a Browser, and (3) the morphs in question are not accepting
> drops...?
> Thanks,
> Tim J
> * I don't want to get into the semantics wars, but in US English, "drop
> in" typically is used to describe an office or medical facility that does
> not require reservations, e.g. a "drop-in clinic."  I guess someone made
> the decision that "accept drops" was no longer acceptable...?  It is still
> referred to as such in various documentation:
> http://wiki.squeak.org/squeak/6511 https://wiki.squeak.org/squeak/6194
> 'Accept' is such common terminology w/r/t Morphs, it is a verb in the
> 'accept' / 'repel' protocol...
> https://github.com/hpi-swa-lab/SqueakByExample-english/blob/8287133e110d49c218e0a2ad6d6dc913adfe9b43/Morphic/Morphic.tex
> On Apr 4, 2022, at 12:18 AM, Marcel Taeumel <marcel.taeumel at hpi.de> wrote:
> Hi Tim --
> Yes, thanks for the pointer. The question is whether we can know that not
> a single element in a window would like to accept the drop. I don't think
> we can. Windows can host all kinds of stuff, even other worlds (or
> instances of PasteUpMorph). Hmm...
> Best,
> Marcel
> Am 02.04.2022 19:32:41 schrieb tim Rowledge <tim at rowledge.org>:
> It's a very long time since I played in this part of the sandpit but this
> seems like it might be amenable to the
> Morph>>#wantsDroppedMorph:event:/wantsToBeDroppedInto: protocol. And maybe
> the Morph>>#repelsMorph:event:/#rejectDropEvent: stuff too?
> Surely the logic ought the include testing to see if the SystemWindow
> would ever be interested in accepting the drop?
> > On 2022-04-02, at 10:11 AM, Tim Johnson wrote:
> >
> > Hi,
> >
> > I've been surprised about how SystemWindows become active when dragging
> other SystemWindows, Inspectors, PluggableXYZ windows (or morphs in
> general?) on top of (or over) them. It produces a noticable lag in the UI.
> This is only evident when the preference 'Fast window drag for Morphic' is
> turned OFF and whole windows are being dragged. (Having Soft shadows
> enabled slows it down further, I think.)
> >
> > IMHO these windows would not accept the drop, so they should not become
> active.
> >
> > I did some spying on the UI process and found that all code panes are
> being redrawn (?) when dragging morphs over SystemWindows. This is easily
> and quickly defeated/remedied by commenting out 'self activate' in the
> following method, as follows:
> >
> > SystemWindow>>#mouseEnterDragging: evt
> > "unlock children for drop operations"
> >
> > self flag: #performance. "mt: There may be no need to change appearance
> if no widget wants the drop."
> > self isActive ifTrue: [self lookFocused].
> >
> > (self isActive not and: [evt hand hasSubmorphs]) ifTrue: [
> > "self activate." "unlock contents for drop"
> > evt hand addMouseListener: self. "for drop completion on submorph"
> > ].
> >
> >
> > My question: could the drag-and-drop "#wantsXYZ" protocol be followed
> here to optimize this? Or perhaps there is some other way to /not/ make the
> window active (and thus redraw all its panes, I think?) when a morph /it
> does not want/ is dragged over it?
> >
> > Thanks
> > Tim
> >
> >
> >
> tim
> --
> tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
> Strange OpCodes: DCVP: Destroy another Computer Via Phone-link
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