/*
* Ext GWT - Ext for GWT
* Copyright(c) 2007-2009, Ext JS, LLC.
* licensing@extjs.com
*
* http://extjs.com/license
*/
package com.extjs.gxt.ui.client.dnd;
import java.util.List;
import com.extjs.gxt.ui.client.core.El;
import com.extjs.gxt.ui.client.data.ModelData;
import com.extjs.gxt.ui.client.dnd.DND.Feedback;
import com.extjs.gxt.ui.client.event.DNDEvent;
import com.extjs.gxt.ui.client.util.Rectangle;
import com.extjs.gxt.ui.client.widget.grid.Grid;
import com.google.gwt.user.client.Element;
/**
* A <code>DropTarget</code> implementation for Grids. Supports both inserts and
* appends, specified using
* {@link #setOperation(com.extjs.gxt.ui.client.dnd.DND.Operation)}.
*/
public class GridDropTarget extends DropTarget {
protected Grid<ModelData> grid;
protected int insertIndex;
/**
* Creates a new drop target instance.
*
* @param grid the target grid
*/
@SuppressWarnings("unchecked")
public GridDropTarget(Grid grid) {
super(grid);
this.grid = grid;
}
/**
* Returns the target grid component.
*
* @return the grid
*/
public Grid<ModelData> getGrid() {
return grid;
}
@Override
@SuppressWarnings("unchecked")
protected void onDragDrop(DNDEvent e) {
super.onDragDrop(e);
Object data = e.getData();
if (feedback == Feedback.APPEND) {
if (data instanceof ModelData) {
grid.getStore().add((ModelData) data);
} else if (data instanceof List) {
grid.getStore().add((List) data);
}
} else {
if (data instanceof ModelData) {
grid.getStore().insert((ModelData) data, insertIndex);
} else if (data instanceof List) {
grid.getStore().insert((List) data, insertIndex);
}
}
}
@Override
protected void onDragEnter(DNDEvent e) {
super.onDragEnter(e);
e.setCancelled(false);
e.getStatus().setStatus(true);
}
@Override
protected void onDragLeave(DNDEvent e) {
super.onDragLeave(e);
}
@Override
protected void onDragMove(DNDEvent event) {
if (!event.within(grid.getView().getBody().dom)) {
event.setCancelled(true);
event.getStatus().setStatus(false);
return;
}
if (feedback == Feedback.APPEND) {
event.setCancelled(false);
} else {
event.setCancelled(false);
}
}
@Override
protected void showFeedback(DNDEvent event) {
if (feedback == Feedback.INSERT) {
event.getStatus().setStatus(true);
Element row = grid.getView().findRow(event.getTarget()).cast();
if (row == null && grid.getStore().getCount() > 0) {
row = grid.getView().getRow(grid.getStore().getCount() - 1).cast();
}
if (row != null) {
int height = row.getOffsetHeight();
int mid = height / 2;
mid += row.getAbsoluteTop();
int y = event.getClientY();
boolean before = y < mid;
int idx = grid.getView().findRowIndex(row);
insertIndex = before ? idx : (event.getDragSource().component == grid) ? idx
: idx + 1;
if (before) {
showInsert(event, row, true);
} else {
showInsert(event, row, false);
}
} else {
insertIndex = 0;
}
}
}
private void showInsert(DNDEvent event, Element row, boolean before) {
Insert insert = Insert.get();
insert.setVisible(true);
Rectangle rect = El.fly(row).getBounds();
int y = !before ? (rect.y + rect.height - 4) : rect.y - 2;
insert.el().setBounds(rect.x, y, rect.width, 6);
}
}