echo-list — General Discussion

Re: [Echo-list] left justification in Labels in Grid Cells

[Phillip B. <phi...@cl...>]

Hi Brian,

This is already there.  Grid.Cell extends Panel which has the methods 
you are looking at.  Try the following with an instance of Grid.Cell...

cell.setHorizontalAlignment(EchoConstants.RIGHT);

regards,

Phillip B.

Re: [Echo-list] Table component.

[Phillip B. <phi...@cl...>]

Hi Tod,

I can understand the desire to keep Echo a self contained library.  My 
reservation with a separate Echo TableModel is I cannot see the benefit 
of reinventing this particular wheel.  Maybe you could clarify the 
reasons for wanting to do this?

If you go ahead with creating a separate model api then I'd request the 
following be part of the design;
- it should be an interface so other implementations can be plugged in 
(probably stating the obvious).
- it would seem likely that most organisations have adaptor classes that 
map their data to Swing TableModels.  Therefore to avoid the need to 
create a whole new set of adaptors for Echo, it would make sense to 
provide a class that adapts a Swing TableModel to an Echo TableModel.

Regarding the column-row parameter ordering I'm not going to object if 
you change it.  The thing to keep in mind (which probably applies to the 
whole of the Echo project), is whenever we create a similar class or 
method to the JDK which deviates from the JDK api we will introduce an 
obstacle to learning and using the framework.  By keeping similar apis 
consistent developers get to transfer their knowledge which makes 
adoption of Echo that much easier.

cheers

Phillip B.

Re: [Echo-list] Table component.

[Tod L. <tli...@ne...>]

Phillip,

Thanks so much for your contribution, its great to see talented 
programmers getting interested in the project.  I've had a chance to 
play around with the Table component and it looks quite nicely done.  
I'd like to merge it into the main tree but there are a couple of 
minor modifications I'd like to do first.

First, I don't want Echo to have any dependency on Swing, so I want to 
create an Echo-specific version of Swing's TableModel and supporting 
event/listener objects.

Second, all other Echo methods currently take coordinates in column-
then-row order.  If I recall correctly, tables are normally done row-
then-column, as is the case of JTable and your implementation.  I 
think it would be better to keep everything consistent across Echo and 
use the column-then-row ordering.

Let me know what you think.

Thanks again,
--Tod Liebeck
  NextApp, Inc.

PS.  I'm out of town until Wednesday morning, so I won't be able to 
get to much done until then.  I'll take a look at the JFreeChart 
component when I get back.

> This is a multi-part message in MIME format.
> 
> Hi all,
> 
> Just started looking at Echo and one of the things I thought was 
missing 
> was a Table component.  So I've built one which you can find 
attached in 
> table.zip.
> 
> It's basically a subclass of Grid which renders and listens to a 
> javax.swing.table.TableModel.  Similar to JTable you can create 
> pluggable TableCellRenderers and it has a TableColumnModel a bit 
like 
> the one in JTable.
> 
> There is a TableServlet class which demos the functionality.
> 
> regards,
> 
> Phillip B.
> 
> 

[Echo-list] Charting added to Echo via JFreeChart

[Phillip B. <phi...@cl...>]

  Attached is a zip file that contains the required code to use Echo 
with JFreeChart. JFreeChart is a LGPL charting library that is available 
from http://www.object-refinery.com/jfreechart

JFreeChart is integrated with Echo via a single class called 
ChartImageReference. This is basically an extended AwtImageReference 
that returns an image of the chart.

ChartImageReference has a setParent() method so that you can identify 
it's containing Component. When a parent is set, the ChartImageReference 
will listen for changes in the JFreeChart and will call the 
Component.update() method of the parent to force the UI to be updated. 
This should allow any changes in the chart to be automatically reflected 
in the UI.

Because the chart is an ImageReference you can use it where ever you can 
use an image. The zip file contains a demonstration servlet which places 
the chart in a Button. This allows you to click on the chart and cycle 
through each of the demos chart types.

In order to run the demo you will need to download a copy of JFreeChart 
from http://www.object-refinery.com/jfreechart . Extract the two jar 
files jcommon-0.5.6.jar and jfreechart-0.7.4.jar from the distribution's 
lib directory and make them available in your classpath. Add the 
following to your web.xml file and you should be able to run the demo 
servlet.

<servlet>
<servlet-name>ChartServlet</servlet-name>
<servlet-class>ChartServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ChartServlet</servlet-name>
<url-pattern>/chartdemo</url-pattern>
</servlet-mapping>

Let me know what you think and if you find any problems.

Tod, do you have any reservations to adding this into the next release?

regards,

Phillip B.

[Echo-list] Bug: Font underline not working with buttons?

[Phillip B. <phi...@cl...>]

I'm trying to use the new Font underline style with the Button component 
and it is not working.  The Button is displaying, there just isn't any 
underline.

e.g.
    public static final Font BUTTON_FONT
            = new Font(Font.TIMES_ROMAN, Font.UNDERLINE, 12);
    button = new Button("Test Button");       
    button.setFont(BUTTON_FONT);       
    mainPane.add(button);

The underline is working fine with Labels though.

Any thoughts?

regards,

Phillip B.

[Echo-list] [ANN] Echo 0.7.2 Released

[Tod L. <tli...@ne...>]

Echo 0.7.2 is finally out.

Changes in this version:
- Added HttpPane which can be used to display
  Non-Echo Web content within an Echo application.
- Added Underline feature to Font.
- The usual mix of fixes and documentation enhancements.

[Echo-list] Table component.

[Phillip B. <phi...@cl...>]

Hi all,

Just started looking at Echo and one of the things I thought was missing 
was a Table component.  So I've built one which you can find attached in 
table.zip.

It's basically a subclass of Grid which renders and listens to a 
javax.swing.table.TableModel.  Similar to JTable you can create 
pluggable TableCellRenderers and it has a TableColumnModel a bit like 
the one in JTable.

There is a TableServlet class which demos the functionality.

regards,

Phillip B.

[Echo-list] [ANN] Echo 0.7.1 Released

[Tod L. <tli...@ne...>]

Echo 0.7.1 has been released!

Changes:
- Added dynamic image rendering capability: In 
  addition to using images retrieved from a Web 
  server, java.awt.Image objects may now be used
  within Echo applications.
- Tutorial dynamic image example added.
- Ancillary services functional.
- Added PNG Encoder to translate java.awt.Image 
  objects into PNG streams.
- Fixed Ant build issue on Windows machines due to 
  case-sensitive file names.

As always, please feel free to contact me with any questions or problems.

[Echo-list] Test Message

[Tod L. <tli...@ne...>]

Testing mailing list.... please disregard.