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Use of different view ids for the same view part instance class [message #690614]

Wed, 29 June 2011 16:29

Eclipse User

Hello Experts!

I have two oracle tables namely EMPLOYEE and ORGANIZATION. My RCP application allows searching for both employee and organization. I have defined a class called ResultsViewPart (this inherits from the org.eclipse.ui.part.ViewPart). Whether the search yields employee objects or organization objects, they are a result of my query and hence I planned to defined one view part class to show results. However I want to open an instance of ResultsViewPart when i search for employee and another instance of ResultsViewPart when I search for organization. Both the instances need to present in the workbench at the same time.

Eclipse allows multiple instances of a view part (with one id) as well it allows different ids to be associated with the same view part class.

Approach 1-

<extension point="org.eclipse.ui.views">
<view
allowMultiple="true"
class="in.dev.ui.views.ResultsViewPart"
id="in.dev.ui.views.resultsview"
name="Results View">
</view>
</extension>

Approach 2 -

<extension point="org.eclipse.ui.views">
<view
allowMultiple="false"
class="in.dev.ui.views.ResultsViewPart"
id="in.dev.ui.views.employee"
name="Results View">
</view>
<view
allowMultiple="false"
class="in.dev.ui.views.ResultsViewPart"
id="in.dev.ui.views.organization"
name="Results View">
</view>
</extension>

Based on if the results are employee or organization I may want to display different actions/menus in the view toolbar meaning, in the results view that has employees will show a different set of menus/commands on the toolbar than when the results view has organizations.

My question is out of approach 1 and approach 2 which is preferable and why ?

Regards.

Re: Use of different view ids for the same view part instance class [message #691047 is a reply to message #690614]

Thu, 30 June 2011 11:45

Eclipse User

if you go for approach 1 then you can use expresions and testers to use multiple commands and command handlers for deferent contexts ( employees and orginizations ) where you can disable a command or a handler for one context and enable them (or another set of commands and handlers) for another context

Re: Use of different view ids for the same view part instance class [message #691051 is a reply to message #690614]

Thu, 30 June 2011 11:50

Eclipse User

Re: Use of different view ids for the same view part instance class [message #698082 is a reply to message #690614]

Mon, 18 July 2011 14:21

Eclipse User

If you use option 2, you can pass in data that tells the instance which kind of view it is working for:

ex:

<view
allowMultiple="false"
class="in.dev.ui.views.ResultsViewPart:employee"
id="in.dev.ui.views.employee"
name="Results View">
</view>
<view
allowMultiple="false"
class="in.dev.ui.views.ResultsViewPart:organization"
id="in.dev.ui.views.organization"
name="Results View">
</view>

In your ViewPart, extend the org.eclipse.ui.part.ViewPart.setInitializationData(IConfigurationElement, String, Object) method and check the data Object parameter.

PW

Re: Use of different view ids for the same view part instance class [message #701630 is a reply to message #698082]

Mon, 25 July 2011 07:02

Eclipse User

Paul - Thank you very much for the reply. I understand that whenever a view part (in this case) is getting created for the first time, it will call this method and we then have a hook to set some information (model related) to display properties in the view or change the view toolbars. I will try this at my end. Thanks again.

Re: Use of different view ids for the same view part instance class [message #701634 is a reply to message #701630]

Mon, 25 July 2011 07:09

Eclipse User

Paul - With this second approach where we have different view ids for the same view part class definition, and if I need to display different icons on the respective view instance toolbar, I can easily achieve that using the menu contributions and the expressions that can be fed the unique ids. Would this approach be better than using the org.eclipse.ui.part.ViewPart.setInitializationData(IConfigurationElement, String, Object) to store the requisite attribute and then later do something to manipulate the toolbars ? Please advice.

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