/*
* Created on Aug 22, 2007
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*
* Copyright @2007-2013 the original author or authors.
*/
package org.fest.swing.test.swing;
import static java.awt.datatransfer.DataFlavor.stringFlavor;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import javax.swing.JComponent;
import javax.swing.TransferHandler;
/**
* Imports and exports {@code String}s. Adapted from the tutorial <a
* href="http://java.sun.com/docs/books/tutorial/uiswing/dnd/intro.html" target="_blank">Introduction to Drag and Drop
* and Data Transfer</a>.
*
* @param <T> specifies the type of component that this class can handle
*
* @author Yvonne Wang
* @author Alex Ruiz
*/
abstract class StringTransferHandler<T extends JComponent> extends TransferHandler {
private static final int[] DEFAULT_ROWS = null;
private static final int DEFAULT_ADD_INDEX = -1;
private static final int DEFAULT_ADD_COUNT = 0;
protected int[] rows;
protected int addIndex; // Location where items were added
protected int addCount; // Number of items added.
private final Class<T> type;
StringTransferHandler(Class<T> type) {
this.type = type;
reset();
}
@Override
protected Transferable createTransferable(JComponent c) {
return new StringSelection(exportString(type.cast(c)));
}
@Override
public int getSourceActions(JComponent c) {
return COPY_OR_MOVE;
}
@Override
public boolean importData(JComponent c, Transferable t) {
if (!canImport(c, t.getTransferDataFlavors())) {
return false;
}
try {
String str = (String) t.getTransferData(stringFlavor);
importString(type.cast(c), str);
return true;
} catch (Exception ignored) {
}
return false;
}
@Override
protected void exportDone(JComponent c, Transferable data, int action) {
cleanup(type.cast(c), action == MOVE);
reset();
}
private void reset() {
rows = DEFAULT_ROWS;
addIndex = DEFAULT_ADD_INDEX;
addCount = DEFAULT_ADD_COUNT;
}
@Override
public boolean canImport(JComponent c, DataFlavor[] flavors) {
for (DataFlavor flavor : flavors) {
if (stringFlavor.equals(flavor)) {
return true;
}
}
return false;
}
protected abstract void importString(T c, String s);
protected abstract String exportString(T c);
protected abstract void cleanup(T c, boolean remove);
}