March 2013 - Pharo-users - lists.pharo.org

Re: [Pharo-users] How can my Morph reflect changes in the object it displays?

by MartinW

Benjamin Van Ryseghem-2 wrote > The problem is mutable objects, what can you do then â¦ > For Spec I introduced value holders :) I was already wondering what ValueHolders were abould :) I am looking forward to the Spec Tutorial Video from the Pharo Conference. Can i already do this with Spec: Display a Slider and a Textfield for a numerical value and when i change the value via the slider the Textfiled will update and vice versa? -- View this message in context: http://forum.world.st/How-can-my-Morph-reflect-changes-in-the-object-it-dis… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

March 21, 2013

Re: [Pharo-users] How can my Morph reflect changes in the object it displays?

by MartinW

Stephan Eggermont wrote >>How to bind a LabelMorph/TextMorph to a variable so that the Morph reflects >>changes of the variable? > > That is a very low-level question. Do you just want to know, or do you > want to use it? > When building UI's in Pharo, the first question should probably be: can I > get away > with building it in Glamour. That is a high-level UI toolkit specialized > in creating > browsers. If you can, it is much less work. I am interested in both questions. I want to just use it - but of course i am interested in knowing different possibilities and how they work and why to prefer one to the other. I have not looked at Glamour yet - and i am a bit reluctant to add an extra layer, but i will give it a try. But btw - isn't it a very common problem to keep for example different views on the same object in sync? For example i want to provide a slider and a textfield for a numerical value. (I probably hoped something like Cocoa Bindings would exist.) -- View this message in context: http://forum.world.st/How-can-my-Morph-reflect-changes-in-the-object-it-dis… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

March 21, 2013

Re: [Pharo-users] How can my Morph reflect changes in the object it displays?

by Benjamin

Yes :S The problem is mutable objects, what can you do then â¦ For Spec I introduced value holders :) But for the basic one, it work only if you set a new value, not if what is inside the value holder mutates. I alo introduce value holders for some collections, but for the rest, I still do not know (maybe JB's handle could cover that ^^) Ben On Mar 21, 2013, at 12:46 PM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > On 21 Mar 2013, at 12:08, Benjamin <benjamin.vanryseghem.pharo(a)gmail.com> wrote: > >> Yes, endless loop with step as far as I remember >> >> stepAt: millisecondClockValue in: aWindow >> | newText | >> >> (CodeHolder smartUpdating and: [(millisecondClockValue - self timeOfLastListUpdate) > 8000]) "Not more often than once every 8 seconds" >> ifTrue: >> [self updateListsAndCodeIn: aWindow. >> timeOfLastListUpdate := millisecondClockValue]. >> >> newText := self contentsIsString >> ifTrue: [self selection] >> ifFalse: ["keep it short to reduce time to compute it" >> self selectionPrintString ]. >> newText = contents ifFalse: >> [contents := newText. >> self changed: #contents] >> >> stepTimeIn: aSystemWindow >> ^ (selectionUpdateTime ifNil: [0]) * 10 max: 1000 >> >> Tadaaa :) >> The old Browser was doing the same, and a lot of Morphs are doing this :s > > Yeah ;-) > > Now, from the user/developer standpoint it is of course nice to have an IDE that is as close as possible to a live objects environment. For browsers, announcement are a solution. For inspectors or debuggers showing arbitrary instance variables of objects, the question of how to implement that behaviour seems like an open question. > >> Ben >> >> On Mar 21, 2013, at 12:00 PM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: >> >>> Ben, >>> >>> But then how does this work ? >>> >>> | point | >>> point := 1@2. >>> point inspect. >>> [ 5 seconds asDelay wait. >>> point setX: 10 setY: 20 ] fork. >>> >>> You can see the inspector change its printString, without ValueHolders>>contents: being involved, just a direct instance variable assignment. >>> >>> Sven >>> >>> On 21 Mar 2013, at 11:41, Benjamin <benjamin.vanryseghem.pharo(a)gmail.com> wrote: >>> >>>> For this kind of situation, my solution is to use a valueHolder >>>> >>>> instead of storing your string directly in an inst var, store it into the value holder >>>> >>>> initialize >>>> string := '' asValueHolder >>>> >>>> string: aString >>>> string contents: aString >>>> >>>> string >>>> ^ string contents >>>> >>>> And then what you can do in your initialise is >>>> >>>> string whenChangedDo: [:newValue | self label contents: newValue ] >>>> >>>> Something like this should work ^^ >>>> >>>> >>>> The other solution (which is baaad, but can still be seen) is to have a step method refreshing the Morph. >>>> But this is really not efficient >>>> >>>> Hope it helps, >>>> Ben >>>> >>>> On Mar 21, 2013, at 11:24 AM, MartinW <wm(a)fastmail.fm> wrote: >>>> >>>>> I asked the same question on Stackoverflow >>>>> (http://stackoverflow.com/questions/15534305/how-to-bind-a-labelmorph-textmo…) >>>>> but as i do not know how much the audiences overlap i hope you do not mind >>>>> if i repeat it here: >>>>> >>>>> How to bind a LabelMorph/TextMorph to a variable so that the Morph reflects >>>>> changes of the variable? >>>>> >>>>> - I have an object with a variable containing a String. >>>>> - I have a window containing a LabelMorph/TextMorph (or some other Morph >>>>> that displays Text?). >>>>> How do i bind the LabelMorph/TextMorph to the variable, so that the label >>>>> updates when the String in the variable changes? >>>>> >>>>> - classic Smalltalk-80 dependent/change/update mechanism? >>>>> - Pharo Announcement framework? >>>>> - something different?? >>>>> How would i do this? Which Morph should i use? >>>>> >>>>> Martin. >>>>> >>>>> >>>>> >>>>> -- >>>>> View this message in context: http://forum.world.st/How-can-my-Morph-reflect-changes-in-the-object-it-dis… >>>>> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >>>>> >>>> >>> >>> >> > >

March 21, 2013

Re: [Pharo-users] How can my Morph reflect changes in the object it displays?

by Sven Van Caekenberghe

On 21 Mar 2013, at 12:08, Benjamin <benjamin.vanryseghem.pharo(a)gmail.com> wrote: > Yes, endless loop with step as far as I remember > > stepAt: millisecondClockValue in: aWindow > | newText | > > (CodeHolder smartUpdating and: [(millisecondClockValue - self timeOfLastListUpdate) > 8000]) "Not more often than once every 8 seconds" > ifTrue: > [self updateListsAndCodeIn: aWindow. > timeOfLastListUpdate := millisecondClockValue]. > > newText := self contentsIsString > ifTrue: [self selection] > ifFalse: ["keep it short to reduce time to compute it" > self selectionPrintString ]. > newText = contents ifFalse: > [contents := newText. > self changed: #contents] > > stepTimeIn: aSystemWindow > ^ (selectionUpdateTime ifNil: [0]) * 10 max: 1000 > > Tadaaa :) > The old Browser was doing the same, and a lot of Morphs are doing this :s Yeah ;-) Now, from the user/developer standpoint it is of course nice to have an IDE that is as close as possible to a live objects environment. For browsers, announcement are a solution. For inspectors or debuggers showing arbitrary instance variables of objects, the question of how to implement that behaviour seems like an open question. > Ben > > On Mar 21, 2013, at 12:00 PM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > >> Ben, >> >> But then how does this work ? >> >> | point | >> point := 1@2. >> point inspect. >> [ 5 seconds asDelay wait. >> point setX: 10 setY: 20 ] fork. >> >> You can see the inspector change its printString, without ValueHolders>>contents: being involved, just a direct instance variable assignment. >> >> Sven >> >> On 21 Mar 2013, at 11:41, Benjamin <benjamin.vanryseghem.pharo(a)gmail.com> wrote: >> >>> For this kind of situation, my solution is to use a valueHolder >>> >>> instead of storing your string directly in an inst var, store it into the value holder >>> >>> initialize >>> string := '' asValueHolder >>> >>> string: aString >>> string contents: aString >>> >>> string >>> ^ string contents >>> >>> And then what you can do in your initialise is >>> >>> string whenChangedDo: [:newValue | self label contents: newValue ] >>> >>> Something like this should work ^^ >>> >>> >>> The other solution (which is baaad, but can still be seen) is to have a step method refreshing the Morph. >>> But this is really not efficient >>> >>> Hope it helps, >>> Ben >>> >>> On Mar 21, 2013, at 11:24 AM, MartinW <wm(a)fastmail.fm> wrote: >>> >>>> I asked the same question on Stackoverflow >>>> (http://stackoverflow.com/questions/15534305/how-to-bind-a-labelmorph-textmo…) >>>> but as i do not know how much the audiences overlap i hope you do not mind >>>> if i repeat it here: >>>> >>>> How to bind a LabelMorph/TextMorph to a variable so that the Morph reflects >>>> changes of the variable? >>>> >>>> - I have an object with a variable containing a String. >>>> - I have a window containing a LabelMorph/TextMorph (or some other Morph >>>> that displays Text?). >>>> How do i bind the LabelMorph/TextMorph to the variable, so that the label >>>> updates when the String in the variable changes? >>>> >>>> - classic Smalltalk-80 dependent/change/update mechanism? >>>> - Pharo Announcement framework? >>>> - something different?? >>>> How would i do this? Which Morph should i use? >>>> >>>> Martin. >>>> >>>> >>>> >>>> -- >>>> View this message in context: http://forum.world.st/How-can-my-Morph-reflect-changes-in-the-object-it-dis… >>>> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >>>> >>> >> >> >

March 21, 2013

Re: [Pharo-users] How can my Morph reflect changes in the object it displays?

by Stephan Eggermont

Martin Walk asked: >How to bind a LabelMorph/TextMorph to a variable so that the Morph reflects >changes of the variable? That is a very low-level question. Do you just want to know, or do you want to use it? When building UI's in Pharo, the first question should probably be: can I get away with building it in Glamour. That is a high-level UI toolkit specialized in creating browsers. If you can, it is much less work. Stephan Eggermont

March 21, 2013

Re: [Pharo-users] How can my Morph reflect changes in the object it displays?

by Benjamin

Yes, endless loop with step as far as I remember stepAt: millisecondClockValue in: aWindow | newText | (CodeHolder smartUpdating and: [(millisecondClockValue - self timeOfLastListUpdate) > 8000]) "Not more often than once every 8 seconds" ifTrue: [self updateListsAndCodeIn: aWindow. timeOfLastListUpdate := millisecondClockValue]. newText := self contentsIsString ifTrue: [self selection] ifFalse: ["keep it short to reduce time to compute it" self selectionPrintString ]. newText = contents ifFalse: [contents := newText. self changed: #contents] stepTimeIn: aSystemWindow ^ (selectionUpdateTime ifNil: [0]) * 10 max: 1000 Tadaaa :) The old Browser was doing the same, and a lot of Morphs are doing this :s Ben On Mar 21, 2013, at 12:00 PM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > Ben, > > But then how does this work ? > > | point | > point := 1@2. > point inspect. > [ 5 seconds asDelay wait. > point setX: 10 setY: 20 ] fork. > > You can see the inspector change its printString, without ValueHolders>>contents: being involved, just a direct instance variable assignment. > > Sven > > On 21 Mar 2013, at 11:41, Benjamin <benjamin.vanryseghem.pharo(a)gmail.com> wrote: > >> For this kind of situation, my solution is to use a valueHolder >> >> instead of storing your string directly in an inst var, store it into the value holder >> >> initialize >> string := '' asValueHolder >> >> string: aString >> string contents: aString >> >> string >> ^ string contents >> >> And then what you can do in your initialise is >> >> string whenChangedDo: [:newValue | self label contents: newValue ] >> >> Something like this should work ^^ >> >> >> The other solution (which is baaad, but can still be seen) is to have a step method refreshing the Morph. >> But this is really not efficient >> >> Hope it helps, >> Ben >> >> On Mar 21, 2013, at 11:24 AM, MartinW <wm(a)fastmail.fm> wrote: >> >>> I asked the same question on Stackoverflow >>> (http://stackoverflow.com/questions/15534305/how-to-bind-a-labelmorph-textmo…) >>> but as i do not know how much the audiences overlap i hope you do not mind >>> if i repeat it here: >>> >>> How to bind a LabelMorph/TextMorph to a variable so that the Morph reflects >>> changes of the variable? >>> >>> - I have an object with a variable containing a String. >>> - I have a window containing a LabelMorph/TextMorph (or some other Morph >>> that displays Text?). >>> How do i bind the LabelMorph/TextMorph to the variable, so that the label >>> updates when the String in the variable changes? >>> >>> - classic Smalltalk-80 dependent/change/update mechanism? >>> - Pharo Announcement framework? >>> - something different?? >>> How would i do this? Which Morph should i use? >>> >>> Martin. >>> >>> >>> >>> -- >>> View this message in context: http://forum.world.st/How-can-my-Morph-reflect-changes-in-the-object-it-dis… >>> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >>> >> > >

March 21, 2013

Re: [Pharo-users] How can my Morph reflect changes in the object it displays?

by Sven Van Caekenberghe

Ben, But then how does this work ? | point | point := 1@2. point inspect. [ 5 seconds asDelay wait. point setX: 10 setY: 20 ] fork. You can see the inspector change its printString, without ValueHolders>>contents: being involved, just a direct instance variable assignment. Sven On 21 Mar 2013, at 11:41, Benjamin <benjamin.vanryseghem.pharo(a)gmail.com> wrote: > For this kind of situation, my solution is to use a valueHolder > > instead of storing your string directly in an inst var, store it into the value holder > > initialize > string := '' asValueHolder > > string: aString > string contents: aString > > string > ^ string contents > > And then what you can do in your initialise is > > string whenChangedDo: [:newValue | self label contents: newValue ] > > Something like this should work ^^ > > > The other solution (which is baaad, but can still be seen) is to have a step method refreshing the Morph. > But this is really not efficient > > Hope it helps, > Ben > > On Mar 21, 2013, at 11:24 AM, MartinW <wm(a)fastmail.fm> wrote: > >> I asked the same question on Stackoverflow >> (http://stackoverflow.com/questions/15534305/how-to-bind-a-labelmorph-textmo…) >> but as i do not know how much the audiences overlap i hope you do not mind >> if i repeat it here: >> >> How to bind a LabelMorph/TextMorph to a variable so that the Morph reflects >> changes of the variable? >> >> - I have an object with a variable containing a String. >> - I have a window containing a LabelMorph/TextMorph (or some other Morph >> that displays Text?). >> How do i bind the LabelMorph/TextMorph to the variable, so that the label >> updates when the String in the variable changes? >> >> - classic Smalltalk-80 dependent/change/update mechanism? >> - Pharo Announcement framework? >> - something different?? >> How would i do this? Which Morph should i use? >> >> Martin. >> >> >> >> -- >> View this message in context: http://forum.world.st/How-can-my-Morph-reflect-changes-in-the-object-it-dis… >> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >> >

March 21, 2013

Re: [Pharo-users] How can my Morph reflect changes in the object it displays?

by Benjamin

For this kind of situation, my solution is to use a valueHolder instead of storing your string directly in an inst var, store it into the value holder initialize string := '' asValueHolder string: aString string contents: aString string ^ string contents And then what you can do in your initialise is string whenChangedDo: [:newValue | self label contents: newValue ] Something like this should work ^^ The other solution (which is baaad, but can still be seen) is to have a step method refreshing the Morph. But this is really not efficient Hope it helps, Ben On Mar 21, 2013, at 11:24 AM, MartinW <wm(a)fastmail.fm> wrote: > I asked the same question on Stackoverflow > (http://stackoverflow.com/questions/15534305/how-to-bind-a-labelmorph-textmo…) > but as i do not know how much the audiences overlap i hope you do not mind > if i repeat it here: > > How to bind a LabelMorph/TextMorph to a variable so that the Morph reflects > changes of the variable? > > - I have an object with a variable containing a String. > - I have a window containing a LabelMorph/TextMorph (or some other Morph > that displays Text?). > How do i bind the LabelMorph/TextMorph to the variable, so that the label > updates when the String in the variable changes? > > - classic Smalltalk-80 dependent/change/update mechanism? > - Pharo Announcement framework? > - something different?? > How would i do this? Which Morph should i use? > > Martin. > > > > -- > View this message in context: http://forum.world.st/How-can-my-Morph-reflect-changes-in-the-object-it-dis… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >

March 21, 2013

How can my Morph reflect changes in the object it displays?

by MartinW

I asked the same question on Stackoverflow (http://stackoverflow.com/questions/15534305/how-to-bind-a-labelmorph-textmo…) but as i do not know how much the audiences overlap i hope you do not mind if i repeat it here: How to bind a LabelMorph/TextMorph to a variable so that the Morph reflects changes of the variable? - I have an object with a variable containing a String. - I have a window containing a LabelMorph/TextMorph (or some other Morph that displays Text?). How do i bind the LabelMorph/TextMorph to the variable, so that the label updates when the String in the variable changes? - classic Smalltalk-80 dependent/change/update mechanism? - Pharo Announcement framework? - something different?? How would i do this? Which Morph should i use? Martin. -- View this message in context: http://forum.world.st/How-can-my-Morph-reflect-changes-in-the-object-it-dis… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

March 21, 2013

Re: [Pharo-users] new (learning) project - tiangle with draggable points on a screen

by Alain Busser

MathsOntologie may help a bit, too: There is a "TrianglePlein" object which properties are linked to each other by setters; for example, if you change the length of one side, the area will change at the same time. I found many useful methods of the "point" object, for example the area of a triangle is one of these methods... Alain On Thu, Mar 21, 2013 at 9:09 AM, S Krish <krishnamachari.sudhakar(a)gmail.com>wrote: > There are two ways to approach this problem: > > * Spatial > > * Vector > > *Spatial:* > > As per the pharo by example pdf, you can create a custom TriangleMorph ( > they have a cross ). Add the behavior that you mention to the > TriangleMorphWithAttributes that holds the plain triangle morph. So on > change to the attributes it will modify the triangle. > > There are challenges to using angle / other geometric approaches in the > above, but simple and probably a day's effort. Good for Kid's / early > school graphics > > I am not sure but many other contributions, half way done are there > which do have some works in this line of thought including one on > Kinesthetics with balls that have a gravity like pull etc.. which are quite > good enough. > > *Vector: > * > CAD/ Dr. Geo approach: Use a line that makes a Triangle. Perhaps may need > to add a surface for color fill also. Typical in CAD is to create a > polyline that makes an arbitrary line collection with several points as > input. If its closed you can treat it as an arbitrary polygon with > recognition of the bounded surface for color fill. > > You will then need to do something similar to above to have custom change > shape on attribute changes. > > The offside here is it will be time consuming and will need to use > standard vector formulae's for accuracy with sin / cos transformation as > you deal with angles. > > If you want this, better be sure about the whole requirement, you might > reinvent the Dr. Geo work.. better to study works done in say VW for .dxf > reading / display / CAD package completely once before embarking on this > route. > > > > > On Wed, Mar 20, 2013 at 3:33 PM, sminni <sm(a)planage.com> wrote: > >> Hi >> >> I have a small project (a real requirement) and I want a little guidance >> to >> do it (myself) - >> pl. assume I am new to pharo though I can navigate the IDE & have a >> background in O-O development. >> >> 1. Draw a triangle with draggable handles on points >> 2. The sides length and angles will be displayed (in editable fields) >> 3. We can lock any of the sides / angles >> 4. If the side / angle is edited then an action can be initiated to >> recomplete the triangle by redrawing the side clicked next >> >> Thanks >> Sanjay >> >> >> >> ----- >> --- >> Regards, Sanjay >> -- >> View this message in context: >> http://forum.world.st/new-learning-project-tiangle-with-draggable-points-on… >> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >> >> >

March 21, 2013