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/*******************************************************************************
* Copyright (c) 2008, 2015 Andrew Gvozdev.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Andrew Gvozdev (Quoin Inc.) - Initial implementation
*******************************************************************************/
package org.eclipse.cdt.make.internal.ui.dnd;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.cdt.make.core.IMakeTarget;
import org.eclipse.cdt.make.internal.ui.MakeUIPlugin;
import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.util.LocalSelectionTransfer;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.Transfer;
/**
* {@code LocalTransferDropTargetListener} supports dropping of dragged selection to
* Make Target View. {@link LocalSelectionTransfer} is used as a transfer agent.
*
* @see AbstractContainerAreaDropAdapter
* @see org.eclipse.swt.dnd.DropTargetListener
*/
public class LocalTransferDropTargetListener extends AbstractContainerAreaDropAdapter {
Viewer fViewer;
/**
* Constructor setting a viewer such as TreeViewer.
*
* @param viewer - to provide shell for UI interaction.
*/
public LocalTransferDropTargetListener(Viewer viewer) {
fViewer = viewer;
}
/**
* @return the {@link Transfer} type that this listener can accept a
* drop operation for.
*/
@Override
public Transfer getTransfer() {
return LocalSelectionTransfer.getTransfer();
}
/**
* Get selection from {@link LocalSelectionTransfer}.
*
* @return selection as {@link IStructuredSelection}.
*/
private IStructuredSelection getSelection() {
ISelection selection = LocalSelectionTransfer.getTransfer().getSelection();
if (selection instanceof IStructuredSelection) {
return (IStructuredSelection) selection;
}
return null;
}
/**
* Initial drag operation. Adjusted to be the least of user initiated
* operation and best supported operation for a given selection. The
* operation will be indicated by mouse cursor.
*
* @param operation - incoming operation.
* @return changed operation.
*/
@Override
public int dragEnterOperation(int operation) {
int bestOperation = determineBestOperation(getSelection(), null);
if (bestOperation > operation) {
bestOperation = operation;
}
return bestOperation;
}
/**
* Operation on dragging over target . Adjusted to be the least of user
* initiated operation and best supported operation for a given selection
* considering drop container. The operation will be indicated by mouse
* cursor. Note that drop on itself is not allowed here.
*
* @param operation - incoming operation.
* @param dropContainer - container where drop is going to be.
* @return changed operation.
*/
@Override
public int dragOverOperation(int operation, IContainer dropContainer, Object dropTarget) {
int bestOperation = DND.DROP_NONE;
IStructuredSelection selection = getSelection();
if (dropContainer != null && selection != null && !selection.toList().contains(dropTarget)) {
bestOperation = determineBestOperation(selection, dropContainer);
if (bestOperation > operation) {
bestOperation = operation;
}
}
return bestOperation;
}
/**
* Implementation of the actual drop of {@code dropObject} to {@code dropContainer}.
*
* @param dropObject - object to drop.
* @param dropContainer - container where to drop the object.
* @param operation - drop operation.
*/
@Override
public void dropToContainer(Object dropObject, IContainer dropContainer, int operation) {
if (dropObject instanceof IStructuredSelection && dropContainer != null) {
IMakeTarget[] makeTargets = prepareMakeTargetsFromSelection((IStructuredSelection) dropObject,
dropContainer);
MakeTargetDndUtil.copyTargets(makeTargets, dropContainer, operation, fViewer.getControl().getShell());
}
}
/**
* Check if this item is a file or convertible to file.
*
* @param element - an item to examine.
* @return true if convertible to file.
*/
private static boolean isConvertibleToFile(Object element) {
if (element instanceof IAdaptable) {
IAdaptable a = (IAdaptable) element;
if (a.getAdapter(IFile.class) != null) {
return true;
}
}
return false;
}
/**
* Calculate which operations are available for dropping the selection to
* the target. {@code IMakeTarget} can be moved but files can only be
* copied. The selection should contain only {@code IMakeTarget} or items
* convertible to files.
*
* @param selection - data being dragged.
* @param dropContainer - container where drop is targeted.
*
* @return the most advanced operation available. The return must be one of
* {@link org.eclipse.swt.dnd.DND} operations.
*
* @see DND#DROP_NONE
* @see DND#DROP_COPY
* @see DND#DROP_MOVE
* @see DND#DROP_LINK
*/
private int determineBestOperation(IStructuredSelection selection, IContainer dropContainer) {
int bestOperation = DND.DROP_NONE;
if (selection != null) {
List<?> items = selection.toList();
for (Object item : items) {
if (item instanceof IMakeTarget) {
// Looking for a target which is not being moving to itself
IContainer container = ((IMakeTarget) item).getContainer();
// dropContainer==null means disregard the container
if (dropContainer == null || !dropContainer.equals(container)) {
if (bestOperation < DND.DROP_MOVE) {
bestOperation = DND.DROP_MOVE;
}
} else if (dropContainer.equals(container)) {
// Allow to copy/duplicate targets into the same folder
if (bestOperation < DND.DROP_COPY) {
bestOperation = DND.DROP_COPY;
}
}
} else if (isConvertibleToFile(item)) {
// Files can be copied
if (bestOperation < DND.DROP_COPY) {
bestOperation = DND.DROP_COPY;
}
} else {
// if any item is not drop-able selection is not drop-able
bestOperation = DND.DROP_NONE;
break;
}
}
}
return bestOperation;
}
/**
* Provide the list of make targets made out of selected elements. This method assumes
* {@code IMakeTarget} or items adaptable to files in the selection.
*
* @param selection - selected items.
* @param dropContainer - container where make targets will belong to.
* @return an array of {@code IMakeTarget}s.
*/
private static IMakeTarget[] prepareMakeTargetsFromSelection(IStructuredSelection selection,
IContainer dropContainer) {
List<?> elements = selection.toList();
List<IMakeTarget> makeTargetsList = new ArrayList<>(elements.size());
for (Object element : elements) {
if (element instanceof IMakeTarget) {
makeTargetsList.add((IMakeTarget) element);
continue;
} else if (isConvertibleToFile(element)) {
IAdaptable a = (IAdaptable) element;
IFile file = a.getAdapter(IFile.class);
String fileName = file.getName();
String fileLocation = file.getLocation().toString();
if (fileName != null) {
try {
String buildCommand = MakeTargetDndUtil.getProjectBuildCommand(dropContainer.getProject());
IMakeTarget makeTarget = MakeTargetDndUtil.createMakeTarget(fileName, fileLocation,
buildCommand, dropContainer);
makeTargetsList.add(makeTarget);
} catch (CoreException e) {
// log any problem then ignore it
MakeUIPlugin.log(e);
}
}
}
}
if (makeTargetsList.size() > 0) {
return makeTargetsList.toArray(new IMakeTarget[makeTargetsList.size()]);
}
return null;
}
}
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