From: Pharo-dev [mailto:pharo-dev-boun...@lists.pharo.org] On Behalf Of Henrik
Nergaard
Sent: Wednesday, January 27, 2016 4:47 PM
To: Pharo Development List <pharo-dev@lists.pharo.org>
Subject: Re: [Pharo-dev] Morphic magician requested. What is referencePosition?
#referencePostion returns the specified center for the morph in global
coordinates.
By default this will be the same as “self bounds origin + (self bounds
extent/2.0)” but can have other depending on what #rotationCenter returns.
#referencePositon: on the other hand do not set a new centre, but moves the
morph to a new position by using the referencePosition as origin instead of its
top left corner.
Example:
| m |
m := Morph new
color: Color orange;
extent: 200@72;
openCenteredInWorld;
yourself.
m on: #click send: #value to: [ m referencePosition: (m referencePosition +
(10@10)) ] .
Looking at Morph>>#handleDropMorph: referencePosition is used to place the
dropped morph in centre of the new owner.
“
observation:
‘(self transformedFrom: anEvent hand world) globalPointToLocal: aMorph
referencePosition’ looks incomplete as it will always be equal to just doing
‘aMorph referencePosition’ because #transformedFrom: always returns an
IdentityTransform where # globalPointToLocal: just returns the point given to
it.
“
Correction:
#transformedFrom: translates the dropped morph “center” to the receiving morph
local coordinates (local from the owning transformationMorph) if it has an
owner which is a transformation type Morph (see implementors #tranformFrom:) .
Best regards,
Henrik
From: Pharo-dev [mailto:pharo-dev-boun...@lists.pharo.org] On Behalf Of
Aliaksei Syrel
Sent: Wednesday, January 27, 2016 4:12 PM
To: Pharo Development List
<pharo-dev@lists.pharo.org<mailto:pharo-dev@lists.pharo.org>>
Subject: [Pharo-dev] Morphic magician requested. What is referencePosition?
Hi
Do anyone know what is Morph>>#referencePosition and why is it used to handle
drag and drop?
Here is what method doc says:
"Return the current reference position of the receiver"
Thanks,
Alex
