/*******************************************************************************
 * Copyright (c) 2006 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.eclipse.ui.examples.views.properties.tabbed.article.views;

import org.eclipse.jface.resource.StringConverter;
import org.eclipse.jface.util.Assert;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.FontDialog;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.views.properties.IPropertySource;
import org.eclipse.ui.views.properties.tabbed.AbstractPropertySection;
import org.eclipse.ui.views.properties.tabbed.ITabbedPropertyConstants;
import org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage;

/**
 * The font section on the button tab.
 * 
 * @author Anthony Hunter
 */
public class FontSection
    extends AbstractPropertySection {

    Text fontText;

    private ButtonElement buttonElement;

    public void setInput(IWorkbenchPart part, ISelection selection) {
        super.setInput(part, selection);
        Assert.isTrue(selection instanceof IStructuredSelection);
        Object input = ((IStructuredSelection) selection).getFirstElement();
        Assert.isTrue(input instanceof ButtonElement);
        this.buttonElement = (ButtonElement) input;
    }

    /**
     * @see org.eclipse.ui.views.properties.tabbed.ITabbedPropertySection#createControls(org.eclipse.swt.widgets.Composite,
     *      org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage)
     */
    public void createControls(Composite parent,
            TabbedPropertySheetPage tabbedPropertySheetPage) {
        super.createControls(parent, tabbedPropertySheetPage);
        Composite composite = getWidgetFactory()
            .createFlatFormComposite(parent);
        FormData data;

        Shell shell = new Shell();
        GC gc = new GC(shell);
        gc.setFont(shell.getFont());
        Point point = gc.textExtent("");//$NON-NLS-1$
        int buttonHeight = point.y + 5;
        gc.dispose();
        shell.dispose();

        CLabel fontLabel = getWidgetFactory().createCLabel(composite, "Font:"); //$NON-NLS-1$
        fontText = getWidgetFactory().createText(composite, ""); //$NON-NLS-1$
        fontText.setEditable(false);
        Button fontButton = getWidgetFactory().createButton(composite,
            "Change...", SWT.PUSH); //$NON-NLS-1$
        fontButton.addSelectionListener(new SelectionAdapter() {

            public void widgetSelected(SelectionEvent event) {
                FontDialog ftDialog = new FontDialog(PlatformUI.getWorkbench()
                    .getActiveWorkbenchWindow().getShell());

                FontData fontdata = buttonElement.getControl().getFont()
                    .getFontData()[0];
                String value = fontdata.toString();

                if ((value != null) && (value.length() > 0)) {
                    ftDialog.setFontList(new FontData[] {new FontData(value)});
                }
                FontData fData = ftDialog.open();

                if (fData != null) {
                    value = fData.toString();

                    ButtonElementProperties properties = (ButtonElementProperties) buttonElement
                        .getAdapter(IPropertySource.class);
                    properties.setPropertyValue(
                        ButtonElementProperties.PROPERTY_FONT, value);
                    fontText.setText(StringConverter.asString(fData));
                }
            }
        });

        data = new FormData();
        data.left = new FormAttachment(0, 0);
        data.right = new FormAttachment(fontText,
            -ITabbedPropertyConstants.HSPACE);
        data.top = new FormAttachment(0, 0);
        fontLabel.setLayoutData(data);

        data = new FormData();
        data.left = new FormAttachment(0, STANDARD_LABEL_WIDTH);
        data.right = new FormAttachment(fontButton,
            -ITabbedPropertyConstants.HSPACE);
        data.top = new FormAttachment(0, 0);
        fontText.setLayoutData(data);

        data = new FormData();
        data.right = new FormAttachment(100, 0);
        data.top = new FormAttachment(0, 0);
        data.height = buttonHeight;
        fontButton.setLayoutData(data);
    }

    /*
     * @see org.eclipse.ui.views.properties.tabbed.view.ITabbedPropertySection#refresh()
     */
    public void refresh() {
        FontData fontdata = buttonElement.getControl().getFont().getFontData()[0];
        fontText.setText(StringConverter.asString(fontdata));
    }
}