From: Pharo-dev [mailto:pharo-dev-bounces@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-bounces@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>
Subject: [Pharo-dev] Morphic magician requested. What is referencePosition?

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