Digital Mars - digitalmars.D.dwt

↑ ↓ ← → Hasan Aljudy <hasan.aljudy gmail.com> writes:

ns wrote:
 The harmonia wiki does not seem to have much content.
 
 http://harmonia.terrainformatica.com/pmwiki.php/Harmonia
 
 Except for the packages and forum links on left, no other links seem to 
 work.
 
 Is there any documentation/tutorials on harmonia where I can get to know 
  it better ?
 
 Thanks in advance.
 NS


There used to be something there .. but I don't why the pages got reset 
to the default wiki page or something.

Unfortunately there doesn't seem to be much documentation for Harmonia, 
which is a shame because it seems to have a really great potential; it's 
not getting the attention it deserves.

Oct 02 2006

↑ ↓ ← → Kristian <kjkilpi gmail.com> writes:

On Sat, 07 Oct 2006 04:38:39 +0300, Hasan Aljudy <hasan.aljudy gmail.com>  
wrote:
 ns wrote:
 The harmonia wiki does not seem to have much content.
  http://harmonia.terrainformatica.com/pmwiki.php/Harmonia


 oh btw, this is the project's home page, it still has contents.
 http://harmonia.terrainformatica.com/



Looks promising. :) I like very much the sinking/bubbling event  
dispatching. IMHO, that's the correct order to deliver event messages.  
E.g. when the mouse is clicked, the topmost widget (the application  
object, actually) will get the event message first, and finally the  
bottommost widget.

For instance, Qt sends the event message directly to the bottommost  
widget. If you like to catch the message, then you have to create an event  
handler and install it for the widget. Not good.

However, sinking/bubbling does not make signals/slots needless.  
Sinking/bubbling is great when building 'solid constructs', e.g. windows  
(internal messaging). Signals/slots are great when linking widgets to your  
functions and other widgets (external messaging).

For example, there is a container C. Inside it are widgets A and B. When  
the user presses the right mouse button inside the container C, a context  
menu should open. Sinking/bubbling makes this easy to implement: just  
catch the event before A or B gets it. Now, when the user presses left  
mouse button over the widget A, a function X should be called.  
Signals/slots make things breeze here: simply connect the 'pressed()'  
signal (or something similar) to the function X.

Oct 07 2006

↑ ↓ ← → Josh Stern <josh_usenet phadd.net> writes:

On Sat, 07 Oct 2006 12:28:42 +0300, Kristian wrote:

 On Sat, 07 Oct 2006 04:38:39 +0300, Hasan Aljudy <hasan.aljudy gmail.com>  
 wrote:
 ns wrote:
 The harmonia wiki does not seem to have much content.
  http://harmonia.terrainformatica.com/pmwiki.php/Harmonia


 oh btw, this is the project's home page, it still has contents.
 http://harmonia.terrainformatica.com/


 
 Looks promising. :) I like very much the sinking/bubbling event  
 dispatching. IMHO, that's the correct order to deliver event messages.  
 E.g. when the mouse is clicked, the topmost widget (the application  
 object, actually) will get the event message first, and finally the  
 bottommost widget.
 
 For instance, Qt sends the event message directly to the bottommost  
 widget. If you like to catch the message, then you have to create an event  
 handler and install it for the widget. Not good.


Hi, I'm not familiar with Harmonia, but it sounds like you are implying
some limitations for Qt that are not really there.   Have a look at the
docs for QCoreApplication::notify()
http://doc.trolltech.com/4.2/qcoreapplication.html#notify
and QObject::installEventFilter()
http://doc.trolltech.com/4.2/qobject.html#installEventFilter
and see if you agree.

Oct 09 2006

↑ ↓ ← → Kristian <kjkilpi gmail.com> writes:

On Tue, 10 Oct 2006 06:17:06 +0300, Josh Stern <josh_usenet phadd.net>  
wrote:

 On Sat, 07 Oct 2006 12:28:42 +0300, Kristian wrote:

 On Sat, 07 Oct 2006 04:38:39 +0300, Hasan Aljudy  
 <hasan.aljudy gmail.com>
 wrote:
 ns wrote:
 The harmonia wiki does not seem to have much content.
  http://harmonia.terrainformatica.com/pmwiki.php/Harmonia


 oh btw, this is the project's home page, it still has contents.
 http://harmonia.terrainformatica.com/



 Looks promising. :) I like very much the sinking/bubbling event
 dispatching. IMHO, that's the correct order to deliver event messages.
 E.g. when the mouse is clicked, the topmost widget (the application
 object, actually) will get the event message first, and finally the
 bottommost widget.

 For instance, Qt sends the event message directly to the bottommost
 widget. If you like to catch the message, then you have to create an  
 event
 handler and install it for the widget. Not good.


 Hi, I'm not familiar with Harmonia, but it sounds like you are implying
 some limitations for Qt that are not really there.   Have a look at the
 docs for QCoreApplication::notify()
 http://doc.trolltech.com/4.2/qcoreapplication.html#notify
 and QObject::installEventFilter()
 http://doc.trolltech.com/4.2/qobject.html#installEventFilter
 and see if you agree.


Well, I don't know if it's a limitation, but a feature. And yes, you can  
catch events by the 'QCoreApplication::notify()' function also. Please  
tell me if I am wrong, but one cannot catch events of another widget  
without using 'QCoreApplication::notify()' or event handlers. For example:

class Button {
     virtual bool event(QEvent *e);
};

class Container {
     virtual bool event(QEvent *e);
};

Button B;
Container C;

C.add(B);

The container 'C' contains the button 'B'. When the user clicks a mouse  
button over 'B', the mouse click event will be delivered to 'B' and only  
to it. That is, 'Container::event()' will not be called. So, if 'C' wants  
to know if a mouse button has been clicked inside it, even if the click  
happens over some of its subitems, you have to redirect events from 'C's  
subitems (i.e. 'B') to 'C' somehow. One way is to create an event handler  
and install it to all the 'C's subitems ('B'). The event filter then calls  
'Container::event()' (or some other function) when necessary.

In sinking/bubbling first 'Container::event()' will be called, then  
'Button::event()' if 'Container::event()' allows it (i.e. it didn't catch  
the event). So, no need to do any 'tricks' with event filters, etc.

Oct 10 2006

↑ ↓ ← → Josh Stern <josh_usenet phadd.net> writes:

On Tue, 10 Oct 2006 11:45:30 +0300, Kristian wrote:

 On Tue, 10 Oct 2006 06:17:06 +0300, Josh Stern <josh_usenet phadd.net>  
 wrote:
 
 On Sat, 07 Oct 2006 12:28:42 +0300, Kristian wrote:

 On Sat, 07 Oct 2006 04:38:39 +0300, Hasan Aljudy  
 <hasan.aljudy gmail.com>
 wrote:
 ns wrote:
 The harmonia wiki does not seem to have much content.
  http://harmonia.terrainformatica.com/pmwiki.php/Harmonia


 oh btw, this is the project's home page, it still has contents.
 http://harmonia.terrainformatica.com/



 Looks promising. :) I like very much the sinking/bubbling event
 dispatching. IMHO, that's the correct order to deliver event messages.
 E.g. when the mouse is clicked, the topmost widget (the application
 object, actually) will get the event message first, and finally the
 bottommost widget.

 For instance, Qt sends the event message directly to the bottommost
 widget. If you like to catch the message, then you have to create an  
 event
 handler and install it for the widget. Not good.


 Hi, I'm not familiar with Harmonia, but it sounds like you are implying
 some limitations for Qt that are not really there.   Have a look at the
 docs for QCoreApplication::notify()
 http://doc.trolltech.com/4.2/qcoreapplication.html#notify
 and QObject::installEventFilter()
 http://doc.trolltech.com/4.2/qobject.html#installEventFilter
 and see if you agree.


 Well, I don't know if it's a limitation, but a feature. And yes, you can  
 catch events by the 'QCoreApplication::notify()' function also. Please  
 tell me if I am wrong, but one cannot catch events of another widget  
 without using 'QCoreApplication::notify()' or event handlers.


Yes, I think "cannot" is wrong.   If the the most spatially specific
widget doesn't want to handle the event in the general case, the event 
is normally propaged to the spatial parent (this is traditional for all
X11 toolkits based on the way Xlib itself works, and Qt's notify follows
that), but if you want to intervene in a special case then Qt allows you
to install an EventFilter. That's what my two links above are describing -
first how the general case is handled, and then how EventFilters work.

Oct 10 2006

↑ ↓ ← → Hasan Aljudy <hasan.aljudy gmail.com> writes:

Hasan Aljudy wrote:
 
 
 ns wrote:
 The harmonia wiki does not seem to have much content.

 http://harmonia.terrainformatica.com/pmwiki.php/Harmonia


 oh btw, this is the project's home page, it still has contents.
 http://harmonia.terrainformatica.com/


The wiki pages seem to be back-up now.

Oct 07 2006

digitalmars.D.dwt - about harmonia