Cut,Copy,Paste

Cut, Copy and Paste in ZK Spreadsheet

ZK Spreadsheet use Range to represents a cell, a row, a column, or selection of cells. We can use Range to get information or execute command. In here, we use Range to demonstrate how to implement cut, copy, and paste function by menu and control keys.

Copy function

1. We can construct Range object by Ranges, it has various functions, for example

Ranges.range(sheet, "A1:D4");

2. We can use Component.setAttribute to save user's current selection range

private void setSource() {
	Rect selectedRect = spreadsheet.getSelection();
	Range range = Ranges.range(spreadsheet.getSelectedSheet(), 
				selectedRect.getTop(), 
				selectedRect.getLeft(), 
				selectedRect.getBottom(),
				selectedRect.getRight());

        //save user selection range
	spreadsheet.setAttribute(KEY_SOURCE_RANGE, range);
	spreadsheet.setAttribute(KEY_SOURCE_RECT, selectedRect);
	}

Cut function

We can save a boolean object to distinguish between cut and paset command

private void onCut() {
   spreadsheet.setAttribute(KEY_IS_CUT, Boolean.valueOf(true));
.....

Paste function

We can use Range.copy(Range destination) to copy user's selection

1. Retrieve user's previous selection,,refer to Copy, Cut
We can retrieve by Component.getAttribute, for example

private void onPaste() {
   Range srcRange = (Range)spreadsheet.getAttribute(KEY_SOURCE_RANGE);
   Rect srcRect = (Rect)spreadsheet.getAttribute(KEY_SOURCE_RECT);
....

2. Construct destination Range object
After we get previous selection range and current position, we can construct destination Range, and execute copy

int columnCount = srcRect.getRight() - srcRect.getLeft();
int rowCount = srcRect.getBottom() - srcRect.getTop();

Rect dstRect = spreadsheet.getSelection();
int rowIndex = dstRect.getTop();
int columnIndex = dstRect.getLeft();

Range dst = Ranges.range(spreadsheet.getSelectedSheet(),
					rowIndex, 
					columnIndex, 
					rowIndex + rowCount, 
					columnIndex + columnCount);
srcRange.copy(dst);

Zul example

In zul, we declare a composer for event handling.

<zk>
	<div height="100%" width="100%" apply="demo.CopyPasteComposer">
		<spreadsheet id="spreadsheet" 
			src="/demo_sample.xls"
			maxrows="200" 
			maxcolumns="40" 
			vflex="1" 
			width="100%"
			ctrlKeys="^c^v^x">
		</spreadsheet>
		<menupopup id="cellMenu">
			<menuitem id="cutMenu" label="Cut" />
			<menuitem id="copyMenu" label="Copy" />
			<menuitem id="pasteMenu" label="Paste" />
		</menupopup>
	</div>
</zk>

Composer

In composer, we need to handle events, including onCellRightClick, Menuitem's onClick event and onCtrlKey event

In here, we use org.zkoss.zk.ui.util.GenericForwardComposer, it allow us to write intuitive onXxx$myid event handler methods and it can auto-wired variable.

onCellRightClick

onCellRightClick is spreadsheet's event, this event occurs when user right click on a cell. We use this event to popup menu, allow user to select cut, copy or paste function.

Also, we can retrieve mouse position from CellMouseEvent and set menupopup's popup position.

public void onCellRightClick$spreadsheet(CellMouseEvent event) {
	cellMenu.open(event.getClientx(),  event.getClienty());
}

onCellRightClick

All source code listed in this book is at Github.