Small Talks/2013/June/Column Chooser

Author
Sam Chuang, Engineer, Potix Corporation

Date
May 30, 2013

Version
ZK 6.5 and later

This paragraph is under construction.

Introduction

The Columnchooser is a popup component that shows a dialog of columns, group by column visibility, can be used with Grid, Listbox or any tabluar component. User can interact with the dialog to change column order or change column's visibility.

Columnchooser is base on ZK MVVM, with it's advantage: developer can easily customize the UI (dialog) without touching ViewModel's code.

Operation

Button

OK

The OK button is used to confirm modification change. If user doesn't click OK button, the modification will be lose, revert to previsous status.

Demonstraction:

• Original view

• After modification, click OK button to confirm.

• Result

Cancel

The Cancel button is used to revert to previsous status.

Demonstraction:

• Original view

• After modification, click Cancel button to revert.

• Result

Add to Visible Column

The Add button is used to move selected hidden column to visible column

Demonstraction:

• Original view

• Select a column, then click the Add button

• Click OK button to confirm

• Result

Remove Visible Column

The Remove button is used to move visible column to hidden column

Demonstraction:

• Original view

• Select a visible column, then click the Remove button

• Click OK button to confirm

• Result

Move Visible Column Up

The Move Up button is used to change column order, move select column up.

Demonstraction:

• Original view

• Select a visible column, then click the Move Up button

• Click OK button to confirm

• Result

Move Visible Column Down

The Move Down button is used change column order, move select column down.

Demonstraction:

• Original view

• Select a visible column, then click the Move Down button

• Click OK button to confirm

• Result

Drag & Drop

Drag Hidden Column to Visible Column

Demonstraction:

• Original view

• Drag hidden column, then drop at visible column area

• Click OK button to confirm

• Result

Drag Visible Column to Hidden Column

Demonstraction:

• Original view

• Drag visible column, then drop at hidden column area

• Click OK button to confirm

• Result

Drag Column and Drop on Any Column

Demonstraction:

• Original view

• Drag visible column, then drop at hidden column area

• Click OK button to confirm

• Result

Usage

Visible Columns and Hidden Columns

Invoke Columnchooser.setVisibleColumns(List<String> columns) and Columnchooser.setHiddenColumns(List<String> columns) to setup columns.

ZUL with MVVM

<columnchooser 
	visibleColumns="@load(vm.visibleColumnLabels)"
	hiddenColumns="@load(vm.hiddenColumnLabels)" />

Java

public ArrayList<String> getVisibleColumnLabels() {
	...
}
	
public ArrayList<String> getHiddenColumnLabels() {
	...
}

Open Dialog

The Columnchooser is a popup component, invoke Columnchooser.open(Component ref, String position) to open dialog.

Event

When user made change and confrimed, Columnchooser will fire ColumnVisibilityChangeEvent event, the name of the event is onColumnVisibilityChange

ZUL

<columnchooser 
	visibleColumns="@load(vm.visibleColumnLabels)"
	hiddenColumns="@load(vm.hiddenColumnLabels)"
	onColumnVisibilityChange="@command('doColumnVisibilityChange', 
		visibleColumns=event.visibleColumns, 
		hiddenColumns=event.hiddenColumns)"></columnchooser>

Java

@Command
public void doColumnVisibilityChange(
		@BindingParam("visibleColumns") List<String> visibleColumns, 
		@BindingParam("hiddenColumns") List<String> hiddenColumns) { 
...
}

Template

Default

The Columnchooser contains a default implementation: columnchooser.zul

<zk xmlns:n="native">
	<vlayout 
		apply="org.zkoss.bind.BindComposer" 
		viewModel="@id('vm') @init('org.zkoss.addon.columnchooser.impl.ColumnchooserViewModel')">
		<n:span>Choose the fields to display.</n:span>
		<hlayout>
			<vlayout>
				Available fields:
				<listbox model="@load(vm.hiddenColumns)" width="150px"
					height="200px" droppable="true" selectedItem="@bind(vm.selectedHiddenColumn)"
					onDrop="@command('dropToHiddenColumns', column=event.dragged.value)">
					...
				</listbox>
			</vlayout>
				...
			<vlayout>
				Displayed Columns:
				<listbox model="@load(vm.visibleColumns)" width="150px"
					height="200px" droppable="true" selectedItem="@bind(vm.selectedVisibleColumn)"
					onDrop="@command('dropToVisibleColumns', column=event.dragged.value)">
					...
				</listbox>
			</vlayout>
		</hlayout>
		<hbox pack="end" width="100%" spacing="5px">
			<button onClick="@command('ok')" label="OK" mold="trendy" width="75px"></button>
			<button onClick="@command('cancel')" label="Cancel" mold="trendy" width="75px"></button>
		</hbox>
	</vlayout>
</zk>

The defualt implementation group columns by column visibility into two listbox.

Custom Template

Config template per instance

Developer can easily change the view by Columnchooser.setTemplate(String uri)

ZUL

<columnchooser template="/customColumnChooser.zul"
	visibleColumns="@load(vm.visibleColumnLabels)" 
	hiddenColumns="@load(vm.hiddenColumnLabels)"
	onColumnVisibilityChange="@command('doColumnVisibilityChange', 
		visibleColumns=event.visibleColumns, 
		hiddenColumns=event.hiddenColumns)"></columnchooser>

customColumnChooser.zul

<zk xmlns:n="native">
	<window apply="org.zkoss.bind.BindComposer" viewModel="@id('vm') @init('org.zkoss.addon.columnchooser.impl.ColumnchooserViewModel')"
		title="Edit Columns" border="normal" mode="highlighted" position="center">
		<vlayout spacing="5px">
			<label>Choose the fields to display.</label>
			<hlayout spacing="10px">
				<vlayout>
					Available fields:
					<listbox model="@load(vm.hiddenColumns)" width="150px"
						height="200px" droppable="true" selectedItem="@bind(vm.selectedHiddenColumn)"
						onDrop="@command('dropToHiddenColumns', column=event.dragged.value)">
						...
					</listbox>
				</vlayout>
					...
				<vlayout>
					Displayed Columns:
					<listbox model="@load(vm.visibleColumns)" width="150px"
						height="200px" droppable="true" selectedItem="@bind(vm.selectedVisibleColumn)"
						onDrop="@command('dropToVisibleColumns', column=event.dragged.value)">
						...
					</listbox>
				</vlayout>
			</hlayout>
			<hbox pack="end" width="100%" spacing="5px">
				<button onClick="@command('ok')" label="OK" mold="trendy" width="75px"></button>
				<button onClick="@command('cancel')" label="Cancel" mold="trendy" width="75px"></button>
			</hbox>
		</vlayout>
	</window>
</zk>

Config template globally

Change the template view globaly by using library property org.zkoss.addon.columnchooser.template in zk.xml

	<library-property>
	    <name>org.zkoss.addon.columnchooser.template</name>
	    <value>/customColumnChooser.zul</value>
	</library-property>

View Model

The default template contains a default ColumnchooserViewModel that implements from Columnchooser.ViewModel

Develper can use customize ViewModel base on ColumnchooserViewModel or implements from Columnchooser.ViewModel

Grid with Columnchooser Demo

ZUL

Java

Summary

In this smalltalk I have demonstrated how application developers can easily integrate Columnchooser component with Grid. Please explore the project and enjoy it.

Comments

Copyright © Potix Corporation. This article is licensed under GNU Free Documentation License.