/*******************************************************************************
* Copyright (c) 2000, 2006 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
* Sebastian Davids <sdavids@gmx.de> - Fix for bug 19346 - Dialog
* font should be activated and used by other components.
*******************************************************************************/
package org.eclipse.ui.dialogs;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.viewers.DoubleClickEvent;
import org.eclipse.jface.viewers.IDoubleClickListener;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.jface.viewers.ViewerSorter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.BusyIndicator;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.internal.WorkbenchMessages;
/**
* A class to select elements out of a tree structure.
*
* @since 2.0
*/
public class ElementTreeSelectionDialog extends SelectionStatusDialog {
private TreeViewer fViewer;
private ILabelProvider fLabelProvider;
private ITreeContentProvider fContentProvider;
private ISelectionStatusValidator fValidator = null;
private ViewerComparator fComparator;
private boolean fAllowMultiple = true;
private boolean fDoubleClickSelects = true;
private String fEmptyListMessage = WorkbenchMessages.ElementTreeSelectionDialog_nothing_available;
private IStatus fCurrStatus = new Status(IStatus.OK, PlatformUI.PLUGIN_ID,
IStatus.OK, "", null); //$NON-NLS-1$
private List fFilters;
private Object fInput;
private boolean fIsEmpty;
private int fWidth = 60;
private int fHeight = 18;
/**
* Constructs an instance of <code>ElementTreeSelectionDialog</code>.
* @param parent The parent shell for the dialog
* @param labelProvider the label provider to render the entries
* @param contentProvider the content provider to evaluate the tree structure
*/
public ElementTreeSelectionDialog(Shell parent,
ILabelProvider labelProvider, ITreeContentProvider contentProvider) {
super(parent);
fLabelProvider = labelProvider;
fContentProvider = contentProvider;
setResult(new ArrayList(0));
setStatusLineAboveButtons(true);
int shellStyle = getShellStyle();
setShellStyle(shellStyle | SWT.MAX | SWT.RESIZE);
}
/**
* Sets the initial selection.
* Convenience method.
* @param selection the initial selection.
*/
public void setInitialSelection(Object selection) {
setInitialSelections(new Object[] { selection });
}
/**
* Sets the message to be displayed if the list is empty.
* @param message the message to be displayed.
*/
public void setEmptyListMessage(String message) {
fEmptyListMessage = message;
}
/**
* Specifies if multiple selection is allowed.
* @param allowMultiple
*/
public void setAllowMultiple(boolean allowMultiple) {
fAllowMultiple = allowMultiple;
}
/**
* Specifies if default selected events (double click) are created.
* @param doubleClickSelects
*/
public void setDoubleClickSelects(boolean doubleClickSelects) {
fDoubleClickSelects = doubleClickSelects;
}
/**
* Sets the sorter used by the tree viewer.
* @param sorter
* @deprecated as of 3.3, use {@link ElementTreeSelectionDialog#setComparator(ViewerComparator)} instead
*/
public void setSorter(ViewerSorter sorter) {
fComparator = sorter;
}
/**
* Sets the comparator used by the tree viewer.
* @param comparator
* @since 3.3
*/
public void setComparator(ViewerComparator comparator){
fComparator = comparator;
}
/**
* Adds a filter to the tree viewer.
* @param filter a filter.
*/
public void addFilter(ViewerFilter filter) {
if (fFilters == null) {
fFilters = new ArrayList(4);
}
fFilters.add(filter);
}
/**
* Sets an optional validator to check if the selection is valid.
* The validator is invoked whenever the selection changes.
* @param validator the validator to validate the selection.
*/
public void setValidator(ISelectionStatusValidator validator) {
fValidator = validator;
}
/**
* Sets the tree input.
* @param input the tree input.
*/
public void setInput(Object input) {
fInput = input;
}
/**
* Sets the size of the tree in unit of characters.
* @param width the width of the tree.
* @param height the height of the tree.
*/
public void setSize(int width, int height) {
fWidth = width;
fHeight = height;
}
/**
* Validate the receiver and update the ok status.
*
*/
protected void updateOKStatus() {
if (!fIsEmpty) {
if (fValidator != null) {
fCurrStatus = fValidator.validate(getResult());
updateStatus(fCurrStatus);
} else {
fCurrStatus = new Status(IStatus.OK, PlatformUI.PLUGIN_ID,
IStatus.OK, "", //$NON-NLS-1$
null);
}
} else {
fCurrStatus = new Status(IStatus.ERROR, PlatformUI.PLUGIN_ID,
IStatus.ERROR, fEmptyListMessage, null);
}
updateStatus(fCurrStatus);
}
/*
* (non-Javadoc)
* @see org.eclipse.jface.window.Window#open()
*/
public int open() {
fIsEmpty = evaluateIfTreeEmpty(fInput);
super.open();
return getReturnCode();
}
private void access$superCreate() {
super.create();
}
/**
* Handles cancel button pressed event.
*/
protected void cancelPressed() {
setResult(null);
super.cancelPressed();
}
/*
* @see SelectionStatusDialog#computeResult()
*/
protected void computeResult() {
setResult(((IStructuredSelection) fViewer.getSelection()).toList());
}
/*
* (non-Javadoc)
* @see org.eclipse.jface.window.Window#create()
*/
public void create() {
BusyIndicator.showWhile(null, new Runnable() {
public void run() {
access$superCreate();
fViewer.setSelection(new StructuredSelection(
getInitialElementSelections()), true);
updateOKStatus();
}
});
}
/*
* @see Dialog#createDialogArea(Composite)
*/
protected Control createDialogArea(Composite parent) {
Composite composite = (Composite) super.createDialogArea(parent);
Label messageLabel = createMessageArea(composite);
TreeViewer treeViewer = createTreeViewer(composite);
GridData data = new GridData(GridData.FILL_BOTH);
data.widthHint = convertWidthInCharsToPixels(fWidth);
data.heightHint = convertHeightInCharsToPixels(fHeight);
Tree treeWidget = treeViewer.getTree();
treeWidget.setLayoutData(data);
treeWidget.setFont(parent.getFont());
if (fIsEmpty) {
messageLabel.setEnabled(false);
treeWidget.setEnabled(false);
}
return composite;
}
/**
* Creates the tree viewer.
*
* @param parent the parent composite
* @return the tree viewer
*/
protected TreeViewer createTreeViewer(Composite parent) {
int style = SWT.BORDER | (fAllowMultiple ? SWT.MULTI : SWT.SINGLE);
fViewer = new TreeViewer(new Tree(parent, style));
fViewer.setContentProvider(fContentProvider);
fViewer.setLabelProvider(fLabelProvider);
fViewer.addSelectionChangedListener(new ISelectionChangedListener() {
public void selectionChanged(SelectionChangedEvent event) {
access$setResult(((IStructuredSelection) event.getSelection())
.toList());
updateOKStatus();
}
});
fViewer.setComparator(fComparator);
if (fFilters != null) {
for (int i = 0; i != fFilters.size(); i++) {
fViewer.addFilter((ViewerFilter) fFilters.get(i));
}
}
if (fDoubleClickSelects) {
Tree tree = fViewer.getTree();
tree.addSelectionListener(new SelectionAdapter() {
public void widgetDefaultSelected(SelectionEvent e) {
updateOKStatus();
if (fCurrStatus.isOK()) {
access$superButtonPressed(IDialogConstants.OK_ID);
}
}
});
}
fViewer.addDoubleClickListener(new IDoubleClickListener() {
public void doubleClick(DoubleClickEvent event) {
updateOKStatus();
//If it is not OK or if double click does not
//select then expand
if (!(fDoubleClickSelects && fCurrStatus.isOK())) {
ISelection selection = event.getSelection();
if (selection instanceof IStructuredSelection) {
Object item = ((IStructuredSelection) selection)
.getFirstElement();
if (fViewer.getExpandedState(item)) {
fViewer.collapseToLevel(item, 1);
} else {
fViewer.expandToLevel(item, 1);
}
}
}
}
});
fViewer.setInput(fInput);
return fViewer;
}
/**
* Returns the tree viewer.
*
* @return the tree viewer
*/
protected TreeViewer getTreeViewer() {
return fViewer;
}
private boolean evaluateIfTreeEmpty(Object input) {
Object[] elements = fContentProvider.getElements(input);
if (elements.length > 0) {
if (fFilters != null) {
for (int i = 0; i < fFilters.size(); i++) {
ViewerFilter curr = (ViewerFilter) fFilters.get(i);
elements = curr.filter(fViewer, input, elements);
}
}
}
return elements.length == 0;
}
/**
* Set the result using the super class implementation of
* buttonPressed.
* @param id
* @see org.eclipse.jface.dialogs.Dialog#buttonPressed(int)
*/
protected void access$superButtonPressed(int id) {
super.buttonPressed(id);
}
/**
* Set the result using the super class implementation of
* setResult.
* @param result
* @see SelectionStatusDialog#setResult(int, Object)
*/
protected void access$setResult(List result) {
super.setResult(result);
}
/**
* @see org.eclipse.jface.window.Window#handleShellCloseEvent()
*/
protected void handleShellCloseEvent() {
super.handleShellCloseEvent();
//Handle the closing of the shell by selecting the close icon
if (getReturnCode() == CANCEL) {
setResult(null);
}
}
}