/*
* Copyright (c) 2014, grossmann
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the jo-widgets.org nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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*/
package org.jowidgets.spi.impl.swt.common.clipboard;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.eclipse.swt.dnd.Clipboard;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.dnd.TransferData;
import org.eclipse.swt.widgets.Display;
import org.jowidgets.spi.clipboard.IClipboardSpi;
import org.jowidgets.spi.clipboard.ITransferableSpi;
import org.jowidgets.spi.clipboard.TransferContainer;
import org.jowidgets.spi.clipboard.TransferObject;
import org.jowidgets.spi.clipboard.TransferTypeSpi;
import org.jowidgets.spi.impl.clipboard.AbstractPollingClipboardObservableSpi;
import org.jowidgets.spi.impl.swt.common.options.SwtOptions;
import org.jowidgets.util.IProvider;
import org.jowidgets.util.NullCompatibleEquivalence;
import org.jowidgets.util.Tuple;
public final class SwtClipboard extends AbstractPollingClipboardObservableSpi implements IClipboardSpi {
private static final Transfer TEXT_TRANSFER = TextTransfer.getInstance();
private static final Transfer OBJECT_TRANSFER = ObjectTransfer.getInstance();
private final IProvider<Display> displayProvider;
private Clipboard systemClipboard;
private ITransferableSpi lastContents;
public SwtClipboard(final IProvider<Display> displayProvider) {
super(SwtOptions.getClipbaordPollingMillis());
this.displayProvider = displayProvider;
}
@Override
public void setContents(final ITransferableSpi contents) {
final Clipboard clipboard = getClipboard();
if (clipboard != null) {
if (contents != null) {
setContentsImpl(clipboard, contents);
}
else {
clipboard.clearContents();
}
checkContentChangedInUiThread();
}
}
private void setContentsImpl(final Clipboard clipboard, final ITransferableSpi contents) {
final Collection<TransferTypeSpi> typesSpi = contents.getSupportedTypes();
final List<Tuple<Transfer, Object>> transferTupleList = new LinkedList<Tuple<Transfer, Object>>();
final List<TransferObject> transferObjectsList = new LinkedList<TransferObject>();
for (final TransferTypeSpi typeSpi : typesSpi) {
if (String.class.equals(typeSpi.getJavaType())) {
transferTupleList.add(new Tuple<Transfer, Object>(TEXT_TRANSFER, contents.getData(typeSpi)));
}
else {
transferObjectsList.add(new TransferObject(typeSpi, contents.getData(typeSpi)));
}
}
if (transferObjectsList != null) {
transferTupleList.add(new Tuple<Transfer, Object>(OBJECT_TRANSFER, new TransferContainer(transferObjectsList)));
}
final Transfer[] transfers = new Transfer[transferTupleList.size()];
final Object[] data = new Object[transferTupleList.size()];
int index = 0;
for (final Tuple<Transfer, Object> tuple : transferTupleList) {
transfers[index] = tuple.getFirst();
data[index] = tuple.getSecond();
index++;
}
clipboard.setContents(data, transfers);
}
@Override
public ITransferableSpi getContents() {
final Clipboard clipboard = getClipboard();
if (clipboard != null) {
return getContents(clipboard);
}
else {
return null;
}
}
private ITransferableSpi getContents(final Clipboard clipboard) {
final Map<TransferTypeSpi, Object> transferMap = new LinkedHashMap<TransferTypeSpi, Object>();
for (final TransferData transferData : clipboard.getAvailableTypes()) {
if (TEXT_TRANSFER.isSupportedType(transferData)) {
transferMap.put(new TransferTypeSpi(String.class), clipboard.getContents(TEXT_TRANSFER));
}
else if (OBJECT_TRANSFER.isSupportedType(transferData)) {
final Object data = clipboard.getContents(OBJECT_TRANSFER);
if (data instanceof TransferContainer) {
for (final TransferObject transferObject : ((TransferContainer) data).getTransferObjetcs()) {
transferMap.put(transferObject.getTransferType(), transferObject.getData());
}
}
}
}
if (!transferMap.isEmpty()) {
return new TransferableSpiAdapter(transferMap);
}
else {
return null;
}
}
@Override
protected synchronized void checkContentChanged() {
final Display display = displayProvider.get();
if (display == null || display.isDisposed()) {
return;
}
display.asyncExec(new Runnable() {
@Override
public void run() {
checkContentChangedInUiThread();
}
});
}
protected synchronized void checkContentChangedInUiThread() {
final Clipboard clipboard = getClipboard();
if (clipboard == null) {
return;
}
final ITransferableSpi contents = getContents();
if (!NullCompatibleEquivalence.equals(contents, lastContents)) {
fireClipboardChanged();
}
lastContents = contents;
}
private boolean isUiThread(final Display display) {
final Display currentDisplay = Display.getCurrent();
return currentDisplay != null && currentDisplay == display;
}
@Override
public void dispose() {
super.dispose();
systemClipboard.dispose();
}
private synchronized Clipboard getClipboard() {
if (systemClipboard == null && displayProvider.get() != null) {
final Display display = displayProvider.get();
if (isUiThread(display)) {
systemClipboard = new Clipboard(displayProvider.get());
lastContents = getContents(systemClipboard);
}
else {
display.asyncExec(new Runnable() {
@Override
public void run() {
systemClipboard = new Clipboard(displayProvider.get());
lastContents = getContents(systemClipboard);
}
});
return null;
}
}
return systemClipboard;
}
}