package org.rubypeople.rdt.internal.ui.dialogs;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.viewers.CheckStateChangedEvent;
import org.eclipse.jface.viewers.CheckboxTreeViewer;
import org.eclipse.jface.viewers.ICheckStateListener;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ITreeContentProvider;
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.events.SelectionListener;
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.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.rubypeople.rdt.internal.ui.viewsupport.ContainerCheckedTreeViewer;
/**
* A class to select elements out of a tree structure.
*/
public class CheckedTreeSelectionDialog extends SelectionStatusDialog {
private CheckboxTreeViewer fViewer;
private ILabelProvider fLabelProvider;
private ITreeContentProvider fContentProvider;
private ISelectionValidator fValidator = null;
private ViewerSorter fSorter;
private String fEmptyListMessage = "No entries available";
private IStatus fCurrStatus = new StatusInfo();
private List fFilters;
private Object fInput;
private boolean fIsEmpty;
private int fWidth = 60;
private int fHeight = 18;
private boolean fContainerMode;
private Object[] fExpandedElements;
/**
* Constructs an instance of <code>ElementTreeSelectionDialog</code>.
* @param labelProvider the label provider to render the entries
* @param contentProvider the content provider to evaluate the tree structure
*/
public CheckedTreeSelectionDialog(Shell parent, ILabelProvider labelProvider, ITreeContentProvider contentProvider) {
super(parent);
fLabelProvider = labelProvider;
fContentProvider = contentProvider;
setResult(new ArrayList(0));
setStatusLineAboveButtons(true);
fContainerMode = false;
fExpandedElements = null;
int shellStyle = getShellStyle();
setShellStyle(shellStyle | SWT.MAX | SWT.RESIZE);
}
/**
* If set, the checked /gray state of containers (inner nodes) is derived from the checked state of its
* leaf nodes.
* @param containerMode The containerMode to set
*/
public void setContainerMode(boolean containerMode) {
fContainerMode = containerMode;
}
/**
* 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;
}
/**
* Sets the sorter used by the tree viewer.
*/
public void setSorter(ViewerSorter sorter) {
fSorter = sorter;
}
/**
* 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(ISelectionValidator validator) {
fValidator = validator;
}
/**
* Sets the tree input.
* @param input the tree input.
*/
public void setInput(Object input) {
fInput = input;
}
/**
* Expands the tree
*/
public void setExpandedElements(Object[] elements) {
fExpandedElements = elements;
}
/**
* 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;
}
protected void updateOKStatus() {
if (!fIsEmpty) {
if (fValidator != null) {
fCurrStatus = fValidator.validate(fViewer.getCheckedElements());
updateStatus(fCurrStatus);
} else if (!fCurrStatus.isOK()) {
fCurrStatus = new StatusInfo();
}
} else {
fCurrStatus = new StatusInfo(IStatus.ERROR, fEmptyListMessage);
}
updateStatus(fCurrStatus);
}
/*
* @see Window#open()
*/
public int open() {
fIsEmpty = evaluateIfTreeEmpty(fInput);
BusyIndicator.showWhile(null, new Runnable() {
public void run() {
access$superOpen();
}
});
return getReturnCode();
}
private void access$superOpen() {
super.open();
}
/**
* Handles cancel button pressed event.
*/
protected void cancelPressed() {
setResult(null);
super.cancelPressed();
}
/*
* @see SelectionStatusDialog#computeResult()
*/
protected void computeResult() {
setResult(Arrays.asList(fViewer.getCheckedElements()));
}
/*
* @see Window#create()
*/
public void create() {
super.create();
List initialSelections = getInitialElementSelections();
if (initialSelections != null) {
fViewer.setCheckedElements(initialSelections.toArray());
}
if (fExpandedElements != null) {
fViewer.setExpandedElements(fExpandedElements);
}
updateOKStatus();
}
/*
* @see Dialog#createDialogArea(Composite)
*/
protected Control createDialogArea(Composite parent) {
Composite composite = (Composite) super.createDialogArea(parent);
Label messageLabel = createMessageArea(composite);
Control treeWidget = createTreeViewer(composite);
Control buttonComposite = createSelectionButtons(composite);
GridData data = new GridData(GridData.FILL_BOTH);
data.widthHint = convertWidthInCharsToPixels(fWidth);
data.heightHint = convertHeightInCharsToPixels(fHeight);
treeWidget.setLayoutData(data);
if (fIsEmpty) {
messageLabel.setEnabled(false);
treeWidget.setEnabled(false);
buttonComposite.setEnabled(false);
}
return composite;
}
private Tree createTreeViewer(Composite parent) {
if (fContainerMode) {
fViewer = new ContainerCheckedTreeViewer(parent, SWT.BORDER);
} else {
fViewer = new CheckboxTreeViewer(parent, SWT.BORDER);
}
fViewer.setContentProvider(fContentProvider);
fViewer.setLabelProvider(fLabelProvider);
fViewer.addCheckStateListener(new ICheckStateListener() {
public void checkStateChanged(CheckStateChangedEvent event) {
updateOKStatus();
}
});
fViewer.setSorter(fSorter);
if (fFilters != null) {
for (int i = 0; i != fFilters.size(); i++)
fViewer.addFilter((ViewerFilter) fFilters.get(i));
}
fViewer.setInput(fInput);
return fViewer.getTree();
}
/**
* Add the selection and deselection buttons to the dialog.
* @param composite org.eclipse.swt.widgets.Composite
*/
private Composite createSelectionButtons(Composite composite) {
Composite buttonComposite = new Composite(composite, SWT.RIGHT);
GridLayout layout = new GridLayout();
layout.numColumns = 2;
buttonComposite.setLayout(layout);
GridData data = new GridData(GridData.HORIZONTAL_ALIGN_END | GridData.GRAB_HORIZONTAL);
data.grabExcessHorizontalSpace = true;
composite.setData(data);
Button selectButton = createButton(buttonComposite, IDialogConstants.SELECT_ALL_ID, "Select &All", false);
SelectionListener listener = new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
fViewer.setCheckedElements(fContentProvider.getElements(fInput));
updateOKStatus();
}
};
selectButton.addSelectionListener(listener);
Button deselectButton = createButton(buttonComposite, IDialogConstants.DESELECT_ALL_ID, "&Deselect All", false);
listener = new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
fViewer.setCheckedElements(new Object[0]);
updateOKStatus();
}
};
deselectButton.addSelectionListener(listener);
return buttonComposite;
}
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;
}
}