/*
* Copyright 2005 JBoss Inc
*
* 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.
*/
package org.drools.eclipse.flow.common.view.property;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ListViewer;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
/**
* Dialog for editing a list.
*/
public abstract class EditListDialog<T> extends EditBeanDialog<List<T>> {
private Class<? extends EditBeanDialog<T>> editItemDialogClass;
private List<T> newList;
private ListViewer listViewer;
private Button removeButton;
private Button editButton;
protected EditListDialog(Shell parentShell, String title, Class<? extends EditBeanDialog<T>> editItemDialogClass) {
super(parentShell, title);
this.editItemDialogClass = editItemDialogClass;
}
protected Control createDialogArea(Composite parent) {
Composite composite = (Composite) super.createDialogArea(parent);
GridLayout gridLayout = new GridLayout();
gridLayout.numColumns = 2;
composite.setLayout(gridLayout);
listViewer = new ListViewer(composite, SWT.SINGLE);
listViewer.add(newList.toArray());
listViewer.addSelectionChangedListener(new ISelectionChangedListener() {
public void selectionChanged(SelectionChangedEvent event) {
removeButton.setEnabled(!event.getSelection().isEmpty());
editButton.setEnabled(!event.getSelection().isEmpty());
}
});
GridData gridData = new GridData();
gridData.grabExcessHorizontalSpace = true;
gridData.grabExcessVerticalSpace = true;
gridData.horizontalAlignment = GridData.FILL;
gridData.verticalAlignment = GridData.FILL;
gridData.verticalSpan = 3;
listViewer.getList().setLayoutData(gridData);
Button addButton = new Button(composite, SWT.NONE);
addButton.setText("Add");
gridData = new GridData();
gridData.horizontalAlignment = GridData.FILL;
gridData.verticalAlignment = GridData.BEGINNING;
addButton.setLayoutData(gridData);
addButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
addItem();
}
});
removeButton = new Button(composite, SWT.NONE);
removeButton.setText("Remove");
removeButton.setEnabled(false);
gridData = new GridData();
gridData.verticalAlignment = GridData.BEGINNING;
removeButton.setLayoutData(gridData);
removeButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
removeItem();
}
});
editButton = new Button(composite, SWT.NONE);
editButton.setText("Edit");
editButton.setEnabled(false);
gridData = new GridData();
gridData.horizontalAlignment = GridData.FILL;
gridData.verticalAlignment = GridData.BEGINNING;
editButton.setLayoutData(gridData);
editButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
editItem();
}
});
return composite;
}
public void setValue(List<T> value) {
super.setValue(value);
if (value == null) {
this.newList = new ArrayList<T>();
} else {
this.newList = new ArrayList<T>((List<T>) value);
}
}
protected List<T> updateValue(List<T> value) {
return newList;
}
private void addItem() {
EditBeanDialog<T> dialog = createEditItemDialog();
dialog.setValue(createItem());
int code = dialog.open();
T result = dialog.getValue();
if (code != CANCEL) {
newList.add(result);
listViewer.add(result);
}
}
protected abstract T createItem();
@SuppressWarnings("unchecked")
private void editItem() {
EditBeanDialog<T> dialog = createEditItemDialog();
Iterator<T> iterator = ((StructuredSelection) listViewer.getSelection()).iterator();
if (iterator.hasNext()) {
T value = iterator.next();
int index = newList.lastIndexOf(value);
dialog.setValue(value);
int code = dialog.open();
if (code != CANCEL) {
T result = dialog.getValue();
newList.set(index, result);
listViewer.remove(value);
listViewer.add(result);
}
}
}
@SuppressWarnings("unchecked")
private void removeItem() {
Iterator<T> iterator = ((StructuredSelection) listViewer.getSelection()).iterator();
// single selection only allowed
if (iterator.hasNext()) {
Object item = iterator.next();
newList.remove(item);
listViewer.remove(item);
}
}
protected EditBeanDialog<T> createEditItemDialog() {
try {
return (EditBeanDialog<T>) editItemDialogClass.getConstructor(
new Class[] { Shell.class }).newInstance(
new Object[] { getShell() });
} catch (InstantiationException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
} catch (NoSuchMethodException e) {
throw new RuntimeException(e);
}
}
}