Groups Model

Here we describe how to implement a groups model (GroupsModel). For the concept about component, model and render, please refer to the Model-driven Display section.

A groups model is used to drive components that support groups of data. The groups of data is a two dimensional data: a list of grouped data and each grouped data is a list of data to display. Here is an example. Currently, Listbox and Grid both support a list of grouped data.

Instead of implementing GroupsModel, it is suggested to extend from AbstractGroupsModel, or to use one of the default implementations: GroupsModelArray and SimpleGroupsModel. GroupsModelArray supports regrouping, while SimpleGroupsModel is simpler but no regrouping is allowed (i.e., immutable).

For example, suppose you have a two-dimensional array, then you could

<zk>
	<zscript>
		String[][] datas = new String[][] {
			new String[] {
				// Today
				"RE: Bandbox Autocomplete Problem",
				"RE: It's not possible to navigate a listbox' ite",
				"RE: FileUpload"
			},
			new String[] {
				// Yesterday
				"RE: Opening more than one new browser window",
				"RE: SelectedItemConverter Question"
			},
			new String[] {
				"RE: Times_Series Chart help",
				"RE: SelectedItemConverter Question"
			}			
		};
		GroupsModel model = new SimpleGroupsModel(datas,
			new String[]{"Date: Today", "Date: Yesterday", "Date: Last Week"});
	</zscript>
	<grid model="${model}">
	 	<columns sizable="true">
	       <column label="Subject"/>
	     </columns>
	</grid>
</zk>

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