Header Event

Overview

There are 4 events related to a header:

• onHeaderClick

  This event is fired when a user left clicks on Spreadsheet's header. When a corresponding event listener is invoked, a HeaderMouseEvent object is passed as an argument.

• onHeaderDoubleClick

  This event is fired when a user double clicks on Spreadsheet header. When a corresponding event listener is invoked, a HeaderMouseEvent object is passed as an argument.

• onHeaderRightClick

  This event is fired when a user right clicks on Spreadsheet header. When a corresponding event listener is invoked, a HeaderMouseEvent object is passed as an argument.

• onHeaderUpdate

  This event is fired when a user resize a row (or column) header. When a corresponding event listener is invoked, a HeaderUpdateEvent object is passed as an argument.

Popup Menu Example

Look at the screenshots below, we can show different custom popup menus when a users click a column or row header.

To popup our custom menu, we should disable built-in context menu (showContextMenu="false" or un-specified) first and listen onHeaderRightClick event.

	<window title="ZSS Mouse Events" border="normal" width="100%"
		height="100%" apply="org.zkoss.zss.essential.events.MouseEventsComposer">
		<spreadsheet width="600px" height="300px" 
			maxVisibleRows="100" maxVisibleColumns="40" 
		showFormulabar="true" showToolbar="true" src="/WEB-INF/books/blank.xlsx" >
		</spreadsheet>

		<menupopup id="topHeaderMenu">
			<menuitem id="insertLeftMenu" label="Insert Left" />
			<menuitem id="insertRightMenu" label="Insert Right" />
			<menuitem id="deleteColumnMenu" label="Delete" />
		</menupopup>
		<menupopup id="leftHeaderMenu">
			<menuitem id="insertAboveMenu" label="Insert Above" />
			<menuitem id="insertBelowMenu" label="Insert Below" />
			<menuitem id="deleteRowMenu" label="Delete" />
		</menupopup>
	</window>

• Line 3, 4: Do not specify showContextMenu to disable built-in context menu.
• Line 7, 12: Create custom popup menus.

public class MouseEventsComposer extends SelectorComposer<Component> {

	@Wire
	private Menupopup topHeaderMenu;
	@Wire
	private Menupopup leftHeaderMenu;
	
	@Listen("onHeaderRightClick = #ss")
	public void onHeaderRightClick(HeaderMouseEvent event) {
		
		switch(event.getType()){
		case COLUMN:
			topHeaderMenu.open(event.getClientx(),  event.getClienty());
			break;
		case ROW:
			leftHeaderMenu.open(event.getClientx(),  event.getClienty());
			break;
		}
	}
}

• Line 8: Annotate event listener to list onHeaderRightClick event.
• Line 11: The getType() returns an enumeration HeaderType that can tell you which header is clicked.
• Line 13,16: Show up custom menus at the position where a user right clicks.

All source code listed in this book is at Github.