/*******************************************************************************
* 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 org.eclipse.swt.SWT;
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.Group;
import org.eclipse.swt.widgets.Label;
/**
* Dialog field describing a group with buttons (Checkboxes, radio buttons..)
*/
public class SelectionButtonDialogFieldGroup extends DialogField {
private Composite fButtonComposite;
private Button[] fButtons;
private final String[] fButtonNames;
private final boolean[] fButtonsSelected;
private final boolean[] fButtonsEnabled;
private final int fGroupBorderStyle;
private final int fGroupNumberOfColumns;
private final int fButtonsStyle;
/**
* Creates a group without border.
*/
public SelectionButtonDialogFieldGroup(final int buttonsStyle,
final String[] buttonNames, final int nColumns) {
this(buttonsStyle, buttonNames, nColumns, SWT.NONE);
}
/**
* Creates a group with border (label in border). Accepted button styles are:
* SWT.RADIO, SWT.CHECK, SWT.TOGGLE For border styles see <code>Group</code>
*/
public SelectionButtonDialogFieldGroup(final int buttonsStyle,
final String[] buttonNames, final int nColumns, final int borderStyle) {
super();
fButtonNames = buttonNames;
final int nButtons = buttonNames.length;
fButtonsSelected = new boolean[nButtons];
fButtonsEnabled = new boolean[nButtons];
for (int i = 0; i < nButtons; i++) {
fButtonsSelected[i] = false;
fButtonsEnabled[i] = true;
}
if (buttonsStyle == SWT.RADIO) {
fButtonsSelected[0] = true;
}
fGroupBorderStyle = borderStyle;
fGroupNumberOfColumns = nColumns <= 0 ? nButtons : nColumns;
fButtonsStyle = buttonsStyle;
}
// ------- layout helpers
/*
* @see DialogField#doFillIntoGrid
*/
@Override
public Control[] doFillIntoGrid(final Composite parent, final int nColumns) {
assertEnoughColumns(nColumns);
if (fGroupBorderStyle == SWT.NONE) {
final Label label = getLabelControl(parent);
label.setLayoutData(gridDataForLabel(1));
final Composite buttonsgroup = getSelectionButtonsGroup(parent);
final GridData gd = new GridData();
gd.horizontalSpan = nColumns - 1;
buttonsgroup.setLayoutData(gd);
return new Control[] { label, buttonsgroup };
}
final Composite buttonsgroup = getSelectionButtonsGroup(parent);
final GridData gd = new GridData();
gd.horizontalSpan = nColumns;
buttonsgroup.setLayoutData(gd);
return new Control[] { buttonsgroup };
}
/*
* @see DialogField#doFillIntoGrid
*/
@Override
public int getNumberOfControls() {
return fGroupBorderStyle == SWT.NONE ? 2 : 1;
}
// ------- ui creation
private Button createSelectionButton(final int index, final Composite group,
final SelectionListener listener) {
final Button button = new Button(group, fButtonsStyle | SWT.LEFT);
button.setFont(group.getFont());
button.setText(fButtonNames[index]);
button.setEnabled(isEnabled() && fButtonsEnabled[index]);
button.setSelection(fButtonsSelected[index]);
button.addSelectionListener(listener);
button.setLayoutData(new GridData());
return button;
}
/**
* Returns the group widget. When called the first time, the widget will be created.
*
* @param parent
* The parent composite when called the first time, or <code>null</code>
* after.
*/
public Composite getSelectionButtonsGroup(final Composite parent) {
if (fButtonComposite == null) {
assertCompositeNotNull(parent);
final GridLayout layout = new GridLayout();
layout.makeColumnsEqualWidth = true;
layout.numColumns = fGroupNumberOfColumns;
if (fGroupBorderStyle != SWT.NONE) {
final Group group = new Group(parent, fGroupBorderStyle);
if (fLabelText != null && fLabelText.length() > 0) {
group.setText(fLabelText);
}
fButtonComposite = group;
} else {
fButtonComposite = new Composite(parent, SWT.NULL);
layout.marginHeight = 0;
layout.marginWidth = 0;
}
fButtonComposite.setLayout(layout);
final SelectionListener listener = new SelectionListener() {
@Override
public void widgetDefaultSelected(final SelectionEvent e) {
doWidgetSelected(e);
}
@Override
public void widgetSelected(final SelectionEvent e) {
doWidgetSelected(e);
}
};
final int nButtons = fButtonNames.length;
fButtons = new Button[nButtons];
for (int i = 0; i < nButtons; i++) {
fButtons[i] = createSelectionButton(i, fButtonComposite, listener);
}
final int nRows = nButtons / fGroupNumberOfColumns;
final int nFillElements = nRows * fGroupNumberOfColumns - nButtons;
for (int i = 0; i < nFillElements; i++) {
createEmptySpace(fButtonComposite);
}
}
return fButtonComposite;
}
/**
* Returns a button from the group or <code>null</code> if not yet created.
*/
public Button getSelectionButton(final int index) {
if (index >= 0 && index < fButtons.length) {
return fButtons[index];
}
return null;
}
protected void doWidgetSelected(final SelectionEvent e) {
final Button button = (Button) e.widget;
for (int i = 0; i < fButtons.length; i++) {
if (fButtons[i] == button) {
fButtonsSelected[i] = button.getSelection();
dialogFieldChanged();
return;
}
}
}
// ------ model access
/**
* Returns the selection state of a button contained in the group.
*
* @param index
* The index of the button
*/
public boolean isSelected(final int index) {
if (index >= 0 && index < fButtonsSelected.length) {
return fButtonsSelected[index];
}
return false;
}
/**
* Sets the selection state of a button contained in the group.
*/
public void setSelection(final int index, final boolean selected) {
if (index >= 0 && index < fButtonsSelected.length) {
if (fButtonsSelected[index] != selected) {
fButtonsSelected[index] = selected;
if (fButtons != null) {
final Button button = fButtons[index];
if (isOkToUse(button)) {
button.setSelection(selected);
}
}
}
}
}
// ------ enable / disable management
@Override
protected void updateEnableState() {
super.updateEnableState();
if (fButtons != null) {
final boolean enabled = isEnabled();
for (int i = 0; i < fButtons.length; i++) {
final Button button = fButtons[i];
if (isOkToUse(button)) {
button.setEnabled(enabled && fButtonsEnabled[i]);
}
}
}
}
/**
* Sets the enable state of a button contained in the group.
*/
public void enableSelectionButton(final int index, final boolean enable) {
if (index >= 0 && index < fButtonsEnabled.length) {
fButtonsEnabled[index] = enable;
if (fButtons != null) {
final Button button = fButtons[index];
if (isOkToUse(button)) {
button.setEnabled(isEnabled() && enable);
}
}
}
}
@Override
public void refresh() {
super.refresh();
for (int i = 0; i < fButtons.length; i++) {
final Button button = fButtons[i];
if (isOkToUse(button)) {
button.setSelection(fButtonsSelected[i]);
}
}
}
}