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/*******************************************************************************
* Copyright (c) 2007, 2009 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.ui.viewers;
import java.util.*;
import org.eclipse.equinox.internal.p2.ui.ProvUI;
import org.eclipse.equinox.p2.metadata.IInstallableUnit;
import org.eclipse.jface.util.LocalSelectionTransfer;
import org.eclipse.jface.viewers.*;
import org.eclipse.swt.dnd.*;
import org.eclipse.swt.widgets.Control;
/**
* Implements drag behaviour when IU items are dragged from a repository view.
*
* @since 3.4
*/
public class IUDragAdapter extends DragSourceAdapter {
ISelectionProvider selectionProvider;
/**
* Constructs a new drag adapter.
*
* @param provider
* The selection provider
*/
public IUDragAdapter(ISelectionProvider provider) {
selectionProvider = provider;
}
/**
* Set the drag data to represent the local selection of IU's if possible.
* Fallback to using a text description of each IU.
*/
public void dragSetData(DragSourceEvent event) {
IInstallableUnit[] ius = getSelectedIUs();
if (ius == null || ius.length == 0) {
return;
}
// use local selection transfer if possible
if (LocalSelectionTransfer.getTransfer().isSupportedType(event.dataType)) {
event.data = LocalSelectionTransfer.getTransfer().getSelection();
return;
}
// resort to a text transfer
if (!TextTransfer.getInstance().isSupportedType(event.dataType)) {
return;
}
// Get a text description of each IU and set as the drag data
final StringBuffer buffer = new StringBuffer();
for (int i = 0; i < ius.length; i++) {
buffer.append(ius[i].toString());
buffer.append('\n');
}
event.data = buffer.toString();
}
/**
* Start the drag only if the selection contains IUs.
*/
public void dragStart(DragSourceEvent event) {
// Focus workaround copied from navigator drag adapter
DragSource dragSource = (DragSource) event.widget;
Control control = dragSource.getControl();
if (control != control.getDisplay().getFocusControl()) {
event.doit = false;
return;
}
// Check the selection
IStructuredSelection selection = (IStructuredSelection) selectionProvider.getSelection();
// No drag if nothing is selected
if (selection.isEmpty()) {
event.doit = false;
return;
}
if (!areOnlyIUsSelected(selection)) {
event.doit = false;
return;
}
LocalSelectionTransfer.getTransfer().setSelection(selection);
event.doit = true;
}
private IInstallableUnit[] getSelectedIUs() {
List<IInstallableUnit> ius = new ArrayList<IInstallableUnit>();
ISelection selection = selectionProvider.getSelection();
if (!(selection instanceof IStructuredSelection) || selection.isEmpty()) {
return null;
}
IStructuredSelection structuredSelection = (IStructuredSelection) selection;
Iterator<?> iter = structuredSelection.iterator();
while (iter.hasNext()) {
IInstallableUnit iu = ProvUI.getAdapter(iter.next(), IInstallableUnit.class);
if (iu != null) {
ius.add(iu);
}
}
return ius.toArray(new IInstallableUnit[ius.size()]);
}
private boolean areOnlyIUsSelected(IStructuredSelection selection) {
Iterator<?> iter = selection.iterator();
while (iter.hasNext()) {
IInstallableUnit iu = ProvUI.getAdapter(iter.next(), IInstallableUnit.class);
if (iu == null) {
return false;
}
}
return true;
}
}
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