| A ValueModel that provides relevant GUI state in presentation models.
It provides bound properties for the frequently used JComponent state
enabled,visible and JTextComponent state editable.
ComponentValueModels can be used to set these properties at the
presentation model layer; any ComponentValueModel property change
will be reflected by components bound to that ComponentValueModel.
The ComponentValueModel is similar to the Swing Action class.
If you disable an Action, all buttons and menu items bound to that Action
will be disabled. If you disable a ComponentValueModel, all components
bound to that ComponentValueModel will be disabled. If you set the
ComponentValueModel to invisible, the component bound to it will become
invisible. If you set a ComponentValueModel to non-editable,
the JTextComponents bound to it will become non-editable.
Since version 1.1, PresentationModels can vend ComponentValueModels
using #getComponentModel(String) and
#getBufferedComponentModel(String). Multiple calls
to these factory methods return the same ComponentValueModel.
The BasicComponentFactory and the Bindings class check if the ValueModel
provided to create/bind a Swing component is a ComponentValueModel.
If so, the ComponentValueModel properties will be synchronized
with the associated Swing component properties.
It is recommended to use ComponentValueModels only for those models
that are bound to view components that require GUI state changes.
Example Code:
final class AlbumView {
...
private void initComponents() {
// No state modifications required for the name field.
nameField = BasicComponentFactory.createTextField(
presentationModel.getModel(Album.PROPERTYNAME_NAME));
...
// Enablement shall change for the composer field
composerField = BasicComponentFactory.createTextField(
presentationModel.getComponentModel(Album.PROPERTYNAME_COMPOSER));
...
}
...
}
public final class AlbumPresentationModel extends PresentationModel {
...
private void updateComposerEnablement(boolean enabled) {
getComponentModel(Album.PROPERTYNAME_COMPOSER).setEnabled(enabled);
}
...
}
As of the Binding version 2.0 the ComponentValueModel feature
is implemented for text components, radio buttons, check boxes,
combo boxes, and lists. JColorChoosers bound using the
Bindings class will ignore ComponentValueModel state.
author:
Karsten Lentzsch
version:
$Revision: 1.11 $
See Also: PresentationModel.getComponentModel(String)
See Also: PresentationModel.getBufferedComponentModel(String)
See Also: BasicComponentFactory
See Also: Bindings
since:
1.1 | 