/*******************************************************************************
* Copyright (c) 2000, 2004 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
*******************************************************************************/
package org.erlide.ui.dialogs.fields;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.eclipse.jface.viewers.ColumnLayoutData;
import org.eclipse.jface.viewers.ColumnWeightData;
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.IStructuredContentProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TableLayout;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerSorter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.KeyAdapter;
import org.eclipse.swt.events.KeyEvent;
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.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.erlide.ui.internal.util.TableLayoutComposite;
import org.erlide.ui.util.PixelConverter;
import org.erlide.ui.util.SWTUtil;
/**
* A list with a button bar. Typical buttons are 'Add', 'Remove', 'Up' and 'Down'. List
* model is independent of widget creation. DialogFields controls are: Label, List and
* Composite containing buttons.
*/
public class ListDialogField<Element> extends DialogField {
public static class ColumnsDescription {
protected ColumnLayoutData[] fColumns;
protected String[] fHeaders;
protected boolean fDrawLines;
public ColumnsDescription(final ColumnLayoutData[] columns,
final String[] headers, final boolean drawLines) {
this.fColumns = columns;
this.fHeaders = headers;
this.fDrawLines = drawLines;
}
public ColumnsDescription(final String[] headers, final boolean drawLines) {
this(createColumnWeightData(headers.length), headers, drawLines);
}
public ColumnsDescription(final int nColumns, final boolean drawLines) {
this(createColumnWeightData(nColumns), null, drawLines);
}
private static ColumnLayoutData[] createColumnWeightData(final int nColumns) {
final ColumnLayoutData[] data = new ColumnLayoutData[nColumns];
for (int i = 0; i < nColumns; i++) {
data[i] = new ColumnWeightData(1);
}
return data;
}
}
protected TableViewer fTable;
protected Control fTableControl;
protected ILabelProvider fLabelProvider;
protected ListViewerAdapter fListViewerAdapter;
protected List<Element> fElements;
protected ViewerSorter fViewerSorter;
protected String[] fButtonLabels;
private Button[] fButtonControls;
private boolean[] fButtonsEnabled;
private int fRemoveButtonIndex;
private int fUpButtonIndex;
private int fDownButtonIndex;
private Label fLastSeparator;
private Composite fButtonsControl;
private ISelection fSelectionWhenEnabled;
private final IListAdapter<Element> fListAdapter;
private final Object fParentElement;
private ColumnsDescription fTableColumns;
/**
* Creates the <code>ListDialogField</code>.
*
* @param adapter
* A listener for button invocation, selection changes. Can be
* <code>null</code>.
* @param buttonLabels
* The labels of all buttons: <code>null</code> is a valid array entry and
* marks a separator.
* @param lprovider
* The label provider to render the table entries
*/
public ListDialogField(final IListAdapter<Element> adapter,
final String[] buttonLabels, final ILabelProvider lprovider) {
super();
fListAdapter = adapter;
fLabelProvider = lprovider;
fListViewerAdapter = new ListViewerAdapter();
fParentElement = this;
fElements = new ArrayList<>(10);
fButtonLabels = buttonLabels;
if (fButtonLabels != null) {
final int nButtons = fButtonLabels.length;
fButtonsEnabled = new boolean[nButtons];
for (int i = 0; i < nButtons; i++) {
fButtonsEnabled[i] = true;
}
}
fTable = null;
fTableControl = null;
fButtonsControl = null;
fTableColumns = null;
fRemoveButtonIndex = -1;
fUpButtonIndex = -1;
fDownButtonIndex = -1;
}
/**
* Sets the index of the 'remove' button in the button label array passed in the
* constructor. The behaviour of the button marked as the 'remove' button will then be
* handled internally. (enable state, button invocation behaviour)
*/
public void setRemoveButtonIndex(final int removeButtonIndex) {
fRemoveButtonIndex = removeButtonIndex;
}
/**
* Sets the index of the 'up' button in the button label array passed in the
* constructor. The behaviour of the button marked as the 'up' button will then be
* handled internally. (enable state, button invocation behaviour)
*/
public void setUpButtonIndex(final int upButtonIndex) {
fUpButtonIndex = upButtonIndex;
}
/**
* Sets the index of the 'down' button in the button label array passed in the
* constructor. The behaviour of the button marked as the 'down' button will then be
* handled internally. (enable state, button invocation behaviour)
*/
public void setDownButtonIndex(final int downButtonIndex) {
fDownButtonIndex = downButtonIndex;
}
/**
* Sets the viewerSorter.
*
* @param viewerSorter
* The viewerSorter to set
*/
public void setViewerSorter(final ViewerSorter viewerSorter) {
fViewerSorter = viewerSorter;
}
public void setTableColumns(final ColumnsDescription column) {
fTableColumns = column;
}
// ------ adapter communication
private void buttonPressed(final int index) {
if (!managedButtonPressed(index) && fListAdapter != null) {
fListAdapter.customButtonPressed(this, index);
}
}
/**
* Checks if the button pressed is handled internally
*
* @return Returns true if button has been handled.
*/
protected boolean managedButtonPressed(final int index) {
if (index == fRemoveButtonIndex) {
remove();
} else if (index == fUpButtonIndex) {
up();
if (!fButtonControls[index].isEnabled() && fDownButtonIndex != -1) {
fButtonControls[fDownButtonIndex].setFocus();
}
} else if (index == fDownButtonIndex) {
down();
if (!fButtonControls[index].isEnabled() && fUpButtonIndex != -1) {
fButtonControls[fUpButtonIndex].setFocus();
}
} else {
return false;
}
return true;
}
// ------ layout helpers
/*
* @see DialogField#doFillIntoGrid
*/
@Override
public Control[] doFillIntoGrid(final Composite parent, final int nColumns) {
final PixelConverter converter = new PixelConverter(parent);
assertEnoughColumns(nColumns);
final Label label = getLabelControl(parent);
GridData gd = gridDataForLabel(1);
gd.verticalAlignment = GridData.BEGINNING;
label.setLayoutData(gd);
final Control list = getListControl(parent);
gd = new GridData();
gd.horizontalAlignment = GridData.FILL;
gd.grabExcessHorizontalSpace = false;
gd.verticalAlignment = GridData.FILL;
gd.grabExcessVerticalSpace = true;
gd.horizontalSpan = nColumns - 2;
gd.widthHint = converter.convertWidthInCharsToPixels(50);
gd.heightHint = converter.convertHeightInCharsToPixels(6);
list.setLayoutData(gd);
final Composite buttons = getButtonBox(parent);
gd = new GridData();
gd.horizontalAlignment = GridData.FILL;
gd.grabExcessHorizontalSpace = false;
gd.verticalAlignment = GridData.FILL;
gd.grabExcessVerticalSpace = true;
gd.horizontalSpan = 1;
buttons.setLayoutData(gd);
return new Control[] { label, list, buttons };
}
/*
* @see DialogField#getNumberOfControls
*/
@Override
public int getNumberOfControls() {
return 3;
}
/**
* Sets the minimal width of the buttons. Must be called after widget creation.
*/
public void setButtonsMinWidth(final int minWidth) {
if (fLastSeparator != null) {
((GridData) fLastSeparator.getLayoutData()).widthHint = minWidth;
}
}
// ------ ui creation
/**
* Returns the list control. When called the first time, the control will be created.
*
* @param parent
* The parent composite when called the first time, or <code>null</code>
* after.
*/
public Control getListControl(final Composite parent) {
if (fTableControl == null) {
assertCompositeNotNull(parent);
if (fTableColumns == null) {
fTable = createTableViewer(parent);
final Table tableControl = fTable.getTable();
fTableControl = tableControl;
tableControl.setLayout(new TableLayout());
} else {
final TableLayoutComposite composite = new TableLayoutComposite(parent,
SWT.NONE);
fTableControl = composite;
fTable = createTableViewer(composite);
final Table tableControl = fTable.getTable();
tableControl.setHeaderVisible(fTableColumns.fHeaders != null);
tableControl.setLinesVisible(fTableColumns.fDrawLines);
final ColumnLayoutData[] columns = fTableColumns.fColumns;
for (int i = 0; i < columns.length; i++) {
composite.addColumnData(columns[i]);
final TableColumn column = new TableColumn(tableControl, SWT.NONE);
// tableLayout.addColumnData(columns[i]);
if (fTableColumns.fHeaders != null) {
column.setText(fTableColumns.fHeaders[i]);
}
}
}
fTable.getTable().addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(final KeyEvent e) {
handleKeyPressed(e);
}
});
// fTableControl.setLayout(tableLayout);
fTable.setContentProvider(fListViewerAdapter);
fTable.setLabelProvider(fLabelProvider);
fTable.addSelectionChangedListener(fListViewerAdapter);
fTable.addDoubleClickListener(fListViewerAdapter);
fTable.setInput(fParentElement);
if (fViewerSorter != null) {
fTable.setSorter(fViewerSorter);
}
fTableControl.setEnabled(isEnabled());
if (fSelectionWhenEnabled != null) {
postSetSelection(fSelectionWhenEnabled);
}
}
return fTableControl;
}
/**
* Returns the internally used table viewer.
*/
public TableViewer getTableViewer() {
return fTable;
}
/*
* Subclasses may override to specify a different style.
*/
protected int getListStyle() {
int style = SWT.BORDER | SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL;
if (fTableColumns != null) {
style |= SWT.FULL_SELECTION;
}
return style;
}
protected TableViewer createTableViewer(final Composite parent) {
final Table table = new Table(parent, getListStyle());
return new TableViewer(table);
}
protected Button createButton(final Composite parent, final String label,
final SelectionListener listener) {
final Button button = new Button(parent, SWT.PUSH);
button.setText(label);
button.addSelectionListener(listener);
final GridData gd = new GridData();
gd.horizontalAlignment = GridData.FILL;
gd.grabExcessHorizontalSpace = true;
gd.verticalAlignment = GridData.BEGINNING;
gd.heightHint = SWTUtil.getButtonHeightHint(button);
gd.widthHint = SWTUtil.getButtonWidthHint(button);
button.setLayoutData(gd);
return button;
}
private Label createSeparator(final Composite parent) {
final Label separator = new Label(parent, SWT.NONE);
separator.setVisible(false);
final GridData gd = new GridData();
gd.horizontalAlignment = GridData.FILL;
gd.verticalAlignment = GridData.BEGINNING;
gd.heightHint = 4;
separator.setLayoutData(gd);
return separator;
}
/**
* Returns the composite containing the buttons. When called the first time, the
* control will be created.
*
* @param parent
* The parent composite when called the first time, or <code>null</code>
* after.
*/
public Composite getButtonBox(final Composite parent) {
if (fButtonsControl == null) {
assertCompositeNotNull(parent);
final SelectionListener listener = new SelectionListener() {
@Override
public void widgetDefaultSelected(final SelectionEvent e) {
doButtonSelected(e);
}
@Override
public void widgetSelected(final SelectionEvent e) {
doButtonSelected(e);
}
};
final Composite contents = new Composite(parent, SWT.NULL);
final GridLayout layout = new GridLayout();
layout.marginWidth = 0;
layout.marginHeight = 0;
contents.setLayout(layout);
if (fButtonLabels != null) {
fButtonControls = new Button[fButtonLabels.length];
for (int i = 0; i < fButtonLabels.length; i++) {
final String currLabel = fButtonLabels[i];
if (currLabel != null) {
fButtonControls[i] = createButton(contents, currLabel, listener);
fButtonControls[i].setEnabled(isEnabled() && fButtonsEnabled[i]);
} else {
fButtonControls[i] = null;
createSeparator(contents);
}
}
}
fLastSeparator = createSeparator(contents);
updateButtonState();
fButtonsControl = contents;
}
return fButtonsControl;
}
protected void doButtonSelected(final SelectionEvent e) {
if (fButtonControls != null) {
for (int i = 0; i < fButtonControls.length; i++) {
if (e.widget == fButtonControls[i]) {
buttonPressed(i);
return;
}
}
}
}
/**
* Handles key events in the table viewer. Specifically when the delete key is
* pressed.
*/
protected void handleKeyPressed(final KeyEvent event) {
if (event.character == SWT.DEL && event.stateMask == 0) {
if (fRemoveButtonIndex != -1
&& isButtonEnabled(fTable.getSelection(), fRemoveButtonIndex)) {
managedButtonPressed(fRemoveButtonIndex);
}
}
}
// ------ enable / disable management
/*
* @see DialogField#dialogFieldChanged
*/
@Override
public void dialogFieldChanged() {
super.dialogFieldChanged();
updateButtonState();
}
/*
* Updates the enable state of the all buttons
*/
protected void updateButtonState() {
if (fButtonControls != null && isOkToUse(fTableControl)) {
final ISelection sel = fTable.getSelection();
for (int i = 0; i < fButtonControls.length; i++) {
final Button button = fButtonControls[i];
if (isOkToUse(button)) {
button.setEnabled(isButtonEnabled(sel, i));
}
}
}
}
protected boolean getManagedButtonState(final ISelection sel, final int index) {
if (index == fRemoveButtonIndex) {
return !sel.isEmpty();
} else if (index == fUpButtonIndex) {
return !sel.isEmpty() && canMoveUp();
} else if (index == fDownButtonIndex) {
return !sel.isEmpty() && canMoveDown();
}
return true;
}
/*
* @see DialogField#updateEnableState
*/
@Override
protected void updateEnableState() {
super.updateEnableState();
final boolean enabled = isEnabled();
if (isOkToUse(fTableControl)) {
if (!enabled) {
fSelectionWhenEnabled = fTable.getSelection();
selectElements(null);
} else {
selectElements(fSelectionWhenEnabled);
fSelectionWhenEnabled = null;
}
fTableControl.setEnabled(enabled);
}
updateButtonState();
}
/**
* Sets a button enabled or disabled.
*/
public void enableButton(final int index, final boolean enable) {
if (fButtonsEnabled != null && index < fButtonsEnabled.length) {
fButtonsEnabled[index] = enable;
updateButtonState();
}
}
private boolean isButtonEnabled(final ISelection sel, final int index) {
final boolean extraState = getManagedButtonState(sel, index);
return isEnabled() && extraState && fButtonsEnabled[index];
}
// ------ model access
/**
* Sets the elements shown in the list.
*/
public void setElements(final Collection<? extends Element> elements) {
fElements = new ArrayList<>(elements);
if (isOkToUse(fTableControl)) {
fTable.refresh();
}
dialogFieldChanged();
}
/**
* Gets the elements shown in the list. The list returned is a copy, so it can be
* modified by the user.
*/
public List<Element> getElements() {
return new ArrayList<>(fElements);
}
/**
* Gets the elements shown at the given index.
*/
public Element getElement(final int index) {
return fElements.get(index);
}
/**
* Gets the index of an element in the list or -1 if element is not in list.
*/
public int getIndexOfElement(final Object elem) {
return fElements.indexOf(elem);
}
/**
* Replace an element.
*/
public void replaceElement(final Element oldElement, final Element newElement) {
final int idx = fElements.indexOf(oldElement);
if (idx != -1) {
fElements.set(idx, newElement);
if (isOkToUse(fTableControl)) {
final List<Element> selected = getSelectedElements();
if (selected.remove(oldElement)) {
selected.add(newElement);
}
fTable.refresh();
selectElements(new StructuredSelection(selected));
}
dialogFieldChanged();
} else {
throw new IllegalArgumentException();
}
}
/**
* Adds an element at the end of the list.
*/
public void addElement(final Element element) {
addElement(element, fElements.size());
}
/**
* Adds an element at a position.
*/
public void addElement(final Element element, final int index) {
if (fElements.contains(element)) {
return;
}
fElements.add(index, element);
if (isOkToUse(fTableControl)) {
fTable.add(element);
fTable.setSelection(new StructuredSelection(element));
}
dialogFieldChanged();
}
/**
* Adds elements at the end of the list.
*/
public void addElements(final List<? extends Element> elements) {
final int nElements = elements.size();
if (nElements > 0) {
// filter duplicated
final ArrayList<Element> elementsToAdd = new ArrayList<>(nElements);
for (int i = 0; i < nElements; i++) {
final Element elem = elements.get(i);
if (!fElements.contains(elem)) {
elementsToAdd.add(elem);
}
}
fElements.addAll(elementsToAdd);
if (isOkToUse(fTableControl)) {
fTable.add(elementsToAdd.toArray());
fTable.setSelection(new StructuredSelection(elementsToAdd));
}
dialogFieldChanged();
}
}
/**
* Adds an element at a position.
*/
public void removeAllElements() {
if (!fElements.isEmpty()) {
fElements.clear();
if (isOkToUse(fTableControl)) {
fTable.refresh();
}
dialogFieldChanged();
}
}
/**
* Removes an element from the list.
*/
public void removeElement(final Object element) {
if (fElements.remove(element)) {
if (isOkToUse(fTableControl)) {
fTable.remove(element);
}
dialogFieldChanged();
} else {
throw new IllegalArgumentException();
}
}
/**
* Removes elements from the list.
*/
public void removeElements(final List<Element> elements) {
if (!elements.isEmpty()) {
fElements.removeAll(elements);
if (isOkToUse(fTableControl)) {
fTable.remove(elements.toArray());
}
dialogFieldChanged();
}
}
/**
* Gets the number of elements
*/
public int getSize() {
return fElements.size();
}
public void selectElements(final ISelection selection) {
fSelectionWhenEnabled = selection;
if (isOkToUse(fTableControl)) {
fTable.setSelection(selection, true);
}
}
public void selectFirstElement() {
Object element = null;
if (fViewerSorter != null) {
final Object[] arr = fElements.toArray();
fViewerSorter.sort(fTable, arr);
if (arr.length > 0) {
element = arr[0];
}
} else {
if (!fElements.isEmpty()) {
element = fElements.get(0);
}
}
if (element != null) {
selectElements(new StructuredSelection(element));
}
}
public void postSetSelection(final ISelection selection) {
if (isOkToUse(fTableControl)) {
final Display d = fTableControl.getDisplay();
d.asyncExec(new Runnable() {
@Override
public void run() {
if (isOkToUse(fTableControl)) {
selectElements(selection);
}
}
});
}
}
/**
* Refreshes the table.
*/
@Override
public void refresh() {
super.refresh();
if (isOkToUse(fTableControl)) {
fTable.refresh();
}
}
// ------- list maintenance
private List<Element> moveUp(final List<Element> elements, final List<Element> move) {
final int nElements = elements.size();
final List<Element> res = new ArrayList<>(nElements);
Element floating = null;
for (int i = 0; i < nElements; i++) {
final Element curr = elements.get(i);
if (move.contains(curr)) {
res.add(curr);
} else {
if (floating != null) {
res.add(floating);
}
floating = curr;
}
}
if (floating != null) {
res.add(floating);
}
return res;
}
private void moveUp(final List<Element> toMoveUp) {
if (!toMoveUp.isEmpty()) {
setElements(moveUp(fElements, toMoveUp));
fTable.reveal(toMoveUp.get(0));
}
}
private void moveDown(final List<Element> toMoveDown) {
if (!toMoveDown.isEmpty()) {
setElements(reverse(moveUp(reverse(fElements), toMoveDown)));
fTable.reveal(toMoveDown.get(toMoveDown.size() - 1));
}
}
private List<Element> reverse(final List<Element> p) {
final List<Element> reverse = new ArrayList<>(p.size());
for (int i = p.size() - 1; i >= 0; i--) {
reverse.add(p.get(i));
}
return reverse;
}
private void remove() {
removeElements(getSelectedElements());
}
private void up() {
moveUp(getSelectedElements());
}
private void down() {
moveDown(getSelectedElements());
}
private boolean canMoveUp() {
if (isOkToUse(fTableControl)) {
final int[] indc = fTable.getTable().getSelectionIndices();
for (int i = 0; i < indc.length; i++) {
if (indc[i] != i) {
return true;
}
}
}
return false;
}
private boolean canMoveDown() {
if (isOkToUse(fTableControl)) {
final int[] indc = fTable.getTable().getSelectionIndices();
int k = fElements.size() - 1;
for (int i = indc.length - 1; i >= 0; i--, k--) {
if (indc[i] != k) {
return true;
}
}
}
return false;
}
/**
* Returns the selected elements.
*/
public List<Element> getSelectedElements() {
final List<Element> result = new ArrayList<>();
if (isOkToUse(fTableControl)) {
final ISelection selection = fTable.getSelection();
if (selection instanceof IStructuredSelection) {
@SuppressWarnings("unchecked")
final Iterator<Element> iter = ((IStructuredSelection) selection)
.iterator();
while (iter.hasNext()) {
result.add(iter.next());
}
}
}
return result;
}
// ------- ListViewerAdapter
class ListViewerAdapter implements IStructuredContentProvider,
ISelectionChangedListener, IDoubleClickListener {
// ------- ITableContentProvider Interface ------------
@Override
public void inputChanged(final Viewer viewer, final Object oldInput,
final Object newInput) {
// will never happen
}
public boolean isDeleted(final Object element) {
return false;
}
@Override
public void dispose() {
}
@Override
public Object[] getElements(final Object obj) {
return fElements.toArray();
}
// ------- ISelectionChangedListener Interface ------------
@Override
public void selectionChanged(final SelectionChangedEvent event) {
doListSelected(event);
}
@Override
public void doubleClick(final DoubleClickEvent event) {
doDoubleClick(event);
}
}
protected void doListSelected(final SelectionChangedEvent event) {
updateButtonState();
if (fListAdapter != null) {
fListAdapter.selectionChanged(this);
}
}
protected void doDoubleClick(final DoubleClickEvent event) {
if (fListAdapter != null) {
fListAdapter.doubleClicked(this);
}
}
}