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/**
* Copyright (c) 2012 Mia-Software.
*
* 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:
* Alban Ménager (Soft-Maint) - Bug 387470 - [EFacet][Custom] Editors
*/
package org.eclipse.emf.facet.util.ui.internal.exported.util.widget.component.properties;
import org.eclipse.emf.facet.util.ui.internal.exported.util.widget.AbstractWidget;
import org.eclipse.emf.facet.util.ui.utils.PropertyElement;
import org.eclipse.emf.facet.util.ui.utils.UIUtils;
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.Label;
/**
* This Abstract class provides all the elements to create:</p>
*
* Label : [x]</p>
*
* The label is set by {@link #getLabel()}. The checkbox is initialized with the
* {@link PropertyElement} attributes
* <nl>
* <li>{@link PropertyElement#getValue()} (the value of the property must be a
* boolean)</li>
* <li>{@link PropertyElement#isChangeable()}</li>
* </nl>
*
* The {@link #getError()} method return 'null' because no error can be returned
* (the value of the checkbox is 'true' or 'false').
*
* @see GetChangeableWidget
* @see GetOrderedWidget
* @see GetDerivedWidget
* @see GetTransientWidget
* @see GetUniqueWidget
* @see GetVolatileWidget
* @since 0.3
*/
public abstract class AbstractGetPropertyWidget extends AbstractWidget {
private static final int COLUMN_NUMBER = 2;
private static final int WIDTH_HINT_DEF = 65;
private int labelWidthHint;
private final PropertyElement propertyElement;
private Button propertyButton;
/**
* Constructor. Initialize the composite with a layout of
* {@value #COLUMN_NUMBER} columns and the layoutData with the
* 'fillGridData' attribute of {@link AbstractWidget}.
*
* @param parent
* the parent containing this composite.
* @param style
* the style of the composite.
* @param editingDomain
* the current editing domain.
* @param propertyElement
* the property element that this composite will edit.
*
* @see AbstractWidget
*/
protected AbstractGetPropertyWidget(final Composite parent,
final PropertyElement propertyElement) {
super(parent);
this.propertyElement = propertyElement;
this.labelWidthHint = WIDTH_HINT_DEF;
this.setLayout(new GridLayout(COLUMN_NUMBER, false));
this.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
}
@Override
protected void addSubWidgets() {
if ((getLabel() != null) && !"".equals(getLabel())) { //$NON-NLS-1$
final Label label = UIUtils.createLabel(this, getLabel());
final GridData layoutData = new GridData(SWT.FILL);
layoutData.widthHint = this.labelWidthHint;
label.setLayoutData(layoutData);
label.setEnabled(this.propertyElement.isChangeable());
}
createCheckbox();
}
public void setPropertyEnabled(final boolean enabled) {
this.propertyButton.setSelection(enabled);
}
/**
* Create a checkbox initialized with the {@link PropertyElement} attributes
* <nl>
* <li>Default value : {@link PropertyElement#getValue()} (the value of the
* property must be a boolean)</li>
* <li>Enabled : {@link PropertyElement#isChangeable()}</li>
* </nl>
*/
private void createCheckbox() {
if (this.propertyElement.getValue() == null) {
this.propertyElement.setValue(Boolean.TRUE);
}
SelectionListener selectionListener = null;
if (this.propertyElement.isChangeable()) {
selectionListener = new SelectionListener() {
public void widgetSelected(final SelectionEvent event) {
onSelection((Button) event.getSource());
}
public void widgetDefaultSelected(final SelectionEvent event) {
// Nothing.
}
};
}
this.propertyButton = UIUtils.createCheckbox(this,
this.propertyElement.isChangeable(),
((Boolean) this.propertyElement.getValue()).booleanValue(),
selectionListener);
}
/**
* @param source
*/
protected void onSelection(final Button source) {
this.propertyElement.setValue(Boolean.valueOf(source.getSelection()));
}
/**
* @return the label of the label field. If no label has to be displayed,
* null or void must be returned.
*/
protected abstract String getLabel();
/**
* Method to change the distance between the label and the checkbox.
*
* @param lABEL_WIDTH_HINT
* the lABEL_WIDTH_HINT to set
*/
public void setLabelWidthHint(final int labelWidthHint) {
this.labelWidthHint = labelWidthHint;
}
/**
* @return the value of the property.
*/
public boolean isSelected() {
return this.propertyButton.getSelection();
}
}
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