Difference between revisions of "Documentation/DevGuide/Forms/Loadable Forms"
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<!--<idltopic>com.sun.star.form.XLoadable;com.sun.star.form.XLoadListener</idltopic>--> | <!--<idltopic>com.sun.star.form.XLoadable;com.sun.star.form.XLoadListener</idltopic>--> | ||
A major difference of data forms compared to the underlying row set is the that forms are ''loaded'', and provide an interface to manipulate this state. | A major difference of data forms compared to the underlying row set is the that forms are ''loaded'', and provide an interface to manipulate this state. | ||
| − | + | <source lang="java"> | |
XLoadable xLoad = (XLoadable)FLTools.getParent(aControlModel, XLoadable.class); | XLoadable xLoad = (XLoadable)FLTools.getParent(aControlModel, XLoadable.class); | ||
xLoad.reload(); | xLoad.reload(); | ||
| − | + | </source> | |
Loading is the same as executing the underlying row set, that is, invoking the [http://api.openoffice.org/docs/common/ref/com/sun/star/sdbc/XRowSet.html#execute com.sun.star.sdbc.XRowSet:execute]() method. The <idl>com.sun.star.form.XLoadable</idl> is designed to fit the needs of a form document, for example, it a unloads an already loaded form. | Loading is the same as executing the underlying row set, that is, invoking the [http://api.openoffice.org/docs/common/ref/com/sun/star/sdbc/XRowSet.html#execute com.sun.star.sdbc.XRowSet:execute]() method. The <idl>com.sun.star.form.XLoadable</idl> is designed to fit the needs of a form document, for example, it a unloads an already loaded form. | ||
Revision as of 20:15, 6 April 2008
- Forms as Row Sets
- Loadable Forms
- Sub Forms
- Filtering and Sorting
- Parameters
A major difference of data forms compared to the underlying row set is the that forms are loaded, and provide an interface to manipulate this state.
XLoadable xLoad = (XLoadable)FLTools.getParent(aControlModel, XLoadable.class); xLoad.reload();
Loading is the same as executing the underlying row set, that is, invoking the com.sun.star.sdbc.XRowSet:execute() method. The com.sun.star.form.XLoadable is designed to fit the needs of a form document, for example, it a unloads an already loaded form.
The example above shows how to reload a form. Reloading is executing the row set again. Using reload instead of execute has the advantage of advanced listener mechanisms:
Look at the com.sun.star.form.XLoadable interface. You can add a com.sun.star.form.XLoadListener. This listener not only tells you when load-related events have occurred that is achieved by the com.sun.star.sdbc.XRowSetListener, but also when they are about to happen. In a complex scenario where different listeners are added to different aspects of a form, you use the com.sun.star.form.XLoadable:reload() call to disable all other listeners temporarily. Re-executing a row set is a complex process, thus it triggers a lot of events that are only an after effect of the re-execution.
An additional difference between loading and executing is the positioning of the row set: When using com.sun.star.sdbc.XRowSet:execute(), the set is positioned before the first record. When you use com.sun.star.form.XLoadable:load(), the set is positioned on the first record, as you would expect from a form.
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