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/*******************************************************************************
* Copyright (c) 2000, 2012 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.ui.wizards.dialogfields;
import org.eclipse.cdt.internal.ui.util.SWTUtil;
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.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
/**
* Dialog Field containing a single button such as a radio or checkbox button.
*/
public class SelectionButtonDialogField extends DialogField {
private Button fButton;
private boolean fIsSelected;
private DialogField[] fAttachedDialogFields;
private int fButtonStyle;
/**
* Creates a selection button.
* Allowed button styles: SWT.RADIO, SWT.CHECK, SWT.TOGGLE, SWT.PUSH
*/
public SelectionButtonDialogField(int buttonStyle) {
super();
fIsSelected = false;
fAttachedDialogFields = null;
fButtonStyle = buttonStyle;
}
/**
* Attaches a field to the selection state of the selection button.
* The attached field will be disabled if the selection button is not selected.
*/
public void attachDialogField(DialogField dialogField) {
attachDialogFields(new DialogField[] { dialogField });
}
/**
* Attaches fields to the selection state of the selection button.
* The attached fields will be disabled if the selection button is not selected.
*/
public void attachDialogFields(DialogField[] dialogFields) {
fAttachedDialogFields = dialogFields;
for (int i = 0; i < dialogFields.length; i++) {
dialogFields[i].setEnabled(fIsSelected);
}
}
/**
* Returns <code>true</code> is teh gived field is attached to the selection button.
*/
public boolean isAttached(DialogField editor) {
if (fAttachedDialogFields != null) {
for (int i = 0; i < fAttachedDialogFields.length; i++) {
if (fAttachedDialogFields[i] == editor) {
return true;
}
}
}
return false;
}
// ------- layout helpers
/*
* @see DialogField#doFillIntoGrid
*/
@Override
public Control[] doFillIntoGrid(Composite parent, int nColumns) {
assertEnoughColumns(nColumns);
Button button = getSelectionButton(parent);
GridData gd = new GridData();
gd.horizontalSpan = nColumns;
gd.horizontalAlignment = GridData.FILL;
if (fButtonStyle == SWT.PUSH) {
gd.widthHint = SWTUtil.getButtonWidthHint(button);
}
button.setLayoutData(gd);
return new Control[] { button };
}
/*
* @see DialogField#getNumberOfControls
*/
@Override
public int getNumberOfControls() {
return 1;
}
// ------- ui creation
/**
* Returns the selection button widget. When called the first time, the widget will be created.
* @param group the parent composite when called the first time, or <code>null</code>
* after.
*/
public Button getSelectionButton(Composite group) {
if (fButton == null) {
assertCompositeNotNull(group);
fButton = new Button(group, fButtonStyle);
fButton.setFont(group.getFont());
fButton.setText(fLabelText);
fButton.setEnabled(isEnabled());
fButton.setSelection(fIsSelected);
fButton.addSelectionListener(new SelectionListener() {
@Override
public void widgetDefaultSelected(SelectionEvent e) {
doWidgetSelected(e);
}
@Override
public void widgetSelected(SelectionEvent e) {
doWidgetSelected(e);
}
});
}
return fButton;
}
protected void doWidgetSelected(SelectionEvent e) {
if (isOkToUse(fButton)) {
changeValue(fButton.getSelection());
}
}
private void changeValue(boolean newState) {
if (fIsSelected != newState) {
fIsSelected = newState;
if (fAttachedDialogFields != null) {
boolean focusSet = false;
for (int i = 0; i < fAttachedDialogFields.length; i++) {
fAttachedDialogFields[i].setEnabled(fIsSelected);
if (fIsSelected && !focusSet) {
focusSet = fAttachedDialogFields[i].setFocus();
}
}
}
dialogFieldChanged();
} else if (fButtonStyle == SWT.PUSH) {
dialogFieldChanged();
}
}
// ------ model access
/**
* Returns the selection state of the button.
*/
public boolean isSelected() {
return fIsSelected;
}
/**
* Sets the selection state of the button.
*/
public void setSelection(boolean selected) {
changeValue(selected);
if (isOkToUse(fButton)) {
fButton.setSelection(selected);
}
}
// ------ enable / disable management
/*
* @see DialogField#updateEnableState
*/
@Override
protected void updateEnableState() {
super.updateEnableState();
if (isOkToUse(fButton)) {
fButton.setEnabled(isEnabled());
}
}
}
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