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RE: [ve-dev] Customised Swing layout manager
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Hi Rashmi,
The reason there isn't an entry in LayoutManager.override
is because "null" isn't really a layout manager, more it's the
absence of one. It's sort of an existential problem - is nothing
the presence of something, or the absence of anything ? Is a hole
something that exists, or the absence of something that used to exist ?
The processing of "no layout manager"
is hard coded in the metod ContainerGraphicalEditPart.createLayoutEditorProxy()
that when it realizes there is no explicit layout manager set goes to the
target VM to get the actual one and calls BeanAwtUtilities.getLayoutPolicyFactoryFromLayoutManager(IBeanProxy
layoutManagerProxy, EditDomain editDomain); The first couple of lines
of this see that the layoutManagerProxy is null (a proxy object represents
a handle to a real object on the target VM) and it fluffs up an instance
of NullLayoutPolicyFactory. The ContainerTreeEditPart will have similar
code.
The ApplyNullLayoutConstraintCommand
class is used by the NullLayoutPolicyHelper which is created by the NullLayoutProxyFactory.
Your first step should be to create
your own LayoutManager.override file in your own plugin that defines your
layoutManager. Then create your own .override file for this, e.g.
"MyXYLayout.override" that defines a factory - look at something
like FlowLayout.override to see how to do this. For your factory
make this a copy of the NullLayoutPolicyFactory to start with and just
debug the VE to make sure that your factory is being instantiated and called.
I presume that your layout works by
having a constraint object similar to, say BorderLayout, where when an
object is dropped you want to generate code like
aJPanel.add(getJButton(),new Rectangle(10,10,50,50));
The first thing you want to do on your
layout policy factory is look a how something like BorderLayoutEditPolicy
works, which in a way is closer to what you want than NullLayoutEditPolicy.
NullLayoutEditPolicy (and the commands is uses) have a lot of smarts
to deal with the fact that the constraints on the object get set in the
bounds/size/location feature(s). What you want is something closer
to BorderLayout where they are arguments of the Container.add(Component,Object)
method.
You will have your own LayoutEditPolicy
(that your factory creates) and you need to start by looking at the method
protected Command getCreateCommand(CreateRequest
request)
The argument will contain things like
the XYPosition and what you want to do is return something that generates
the constraint object (which in your case is a rectangle).
Best regards,
Joe Winchester
Please respond to Discussions
people developing code for the Visual Editor project <ve-dev@xxxxxxxxxxx>
Sent by:
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To:
"Discussions people
developing code for the Visual Editor project" <ve-dev@xxxxxxxxxxx>
cc:
Subject:
RE: [ve-dev]
Customised Swing layout manager
Hi All,
Hi All,
The layout that I am trying to
implement in the Visual Editor is similar to the Null Layout(X-Y Layout
like ). While investigating the jfc source code for Null Layout classes
and implementation I observed that there is no entry for null Layout in
the Layout Manager override, even though there is a NullLayout.override
file and the support classes for nulllayout. And also I observed that there
is one command class ApplyNullLayoutConstraintCommand.java, Which used
to make the null layout recognized by the V.E. How would I extend the null
layout to implement my own Layout? What is ApplyNullLayoutConstraintCommand
class represent? Can any body give me some insight in to the Null Layout
Manager?
Help is greatly appreciated.
Thanks in advance,
Rashmi Ramchandra.
-----Original Message-----
From: ve-dev-bounces@xxxxxxxxxxx [mailto:ve-dev-bounces@xxxxxxxxxxx]On
Behalf Of Rich Kulp
Sent: Tuesday, August 30, 2005 6:39 PM
To: Discussions people developing code for the Visual Editor project
Subject: NL:Re: [ve-dev] Customised Swing layout manager
Hi,
No we don't have documentation on this, and at this time it is not API.
We will eventually API this but we have so many things to do. :-(
You're best bet is to find a layout manager that is closest to what your's
does, and then look at what is implemented for it.
Rich
"Rashmi H. Ramachandra"
<rashmi.ramchandra@xxxxxxxxxxxxxxxxxx>
Sent by: ve-dev-bounces@xxxxxxxxxxx
08/30/2005 08:04 AM
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| Re: [ve-dev] Customised Swing
layout manager |
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Hi all,
I was successful in creating a override for loading my LayoutManager
on the the layout property list of the containers. When I started analysing
the BorderLayout.override, I came across a number of classes that do not
have any API support and that are part of jfc core internal package. I
have also noticed other layout related class like LayoutSwitcher, LayoutPolicyHelper,
LayoutEditPolicy and ConstraintPropertyDescriptor that may need to be implemented.
Do we have turorial or any documented help that would tell me how to go
about writing the edit policies for a custom layout manager and the required
classes for implementing a custom constrained layout?
-Rashmi
-----Original Message-----
From: ve-dev-bounces@xxxxxxxxxxx [mailto:ve-dev-bounces@xxxxxxxxxxx]On
Behalf Of Joe Winchester
Sent: Friday, August 26, 2005 5:55 PM
To: Discussions people developing code for the Visual Editor project
Subject: NL:Re: [ve-dev] Customised Swing layout manager
Hi Rashmi,
The best way is to look at how this is done for a layout manager like,
say, BorderLayout. There is a file BorderLayout.override and
this defines the decorator for a factory, and the factory lets you control
things like GEF edit policies (that you will need to build). Look
at the existing factories and you should get a feel for how to do this.
To get your layout manager to appear in the drop down list of available
layout managers in the property sheet look at Container.override. You
could change the base file to add your own which would work OK for you,
but better would be to have your own Container.override in your own plugin
and defined your own layout manager.
If you need help understanding how to create a plugin and get started with
.override try the Visual Editor tutorial on eclipse corner and the VE homepage.
Best regards and please keep us informed of how you get on,
Joe Winchester
Please respond to Discussions
people developing code for the Visual Editor project <ve-dev@xxxxxxxxxxx>
Sent by:
ve-dev-bounces@xxxxxxxxxxx
To: <ve-dev@xxxxxxxxxxx>
cc:
Subject: [ve-dev]
Customised Swing layout manager
Hi all,
I have implemented a swing layout manager along with the constraints class.
I loaded it to the eclipse enviroment as a bundle in the plugin. Now when
i use this layout in a visual class I am able to arrange the components
by changing the constraints values from the source view. But i am unable
to move the component on the design view(changing the constraints from
the properties and design view) .Can you help me out to solve my layout
poblem. Do i need to implement some a layout assistant that will interface
with my layout manager and the visualeditor.
Best Regards
-Rashmi
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