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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.
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#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.
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Example:
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| m |
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m := Morph new
���������������������������� color: Color orange;
���������������������������� extent: 200@72;
���������������������������� openCenteredInWorld;
���������������������������� yourself.
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m on: #click send: #value to: [ m referencePosition: (m referencePosition + (10@10)) ]���� .
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Looking at Morph>>#handleDropMorph: referencePosition is used to place the dropped morph in centre of the new owner.
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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.
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Correction:
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#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:) .
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Best regards,
Henrik
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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?��
Hi
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Do anyone know what is Morph>>#referencePosition and why is it used to handle drag and drop?
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Here is what method doc says:
"Return the current reference position of the receiver"
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Thanks,
Alex