au.gov.ga.earthsci.intent.IntentSelectionDialog.java Source code

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Here is the source code for au.gov.ga.earthsci.intent.IntentSelectionDialog.java

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/*******************************************************************************
 * Copyright 2013 Geoscience Australia
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package au.gov.ga.earthsci.intent;

import java.util.List;

import javax.inject.Inject;
import javax.inject.Named;

import org.eclipse.e4.ui.services.IServiceConstants;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

/**
 * Dialog shown to the user if multiple intent filters match an intent, allowing
 * the user to select the desired handler to handle the intent.
 * 
 * @author Michael de Hoog (michael.dehoog@ga.gov.au)
 */
public class IntentSelectionDialog extends Dialog {
    private final static int ROW_HEIGHT = 40;

    private final List<IntentFilter> filters;
    private int selectedIndex = -1;
    private TableViewer viewer;
    private Text text;
    private int textHeight;

    protected IntentSelectionDialog(Shell parent, Intent intent, List<IntentFilter> filters) {
        super(parent);
        setShellStyle(SWT.DIALOG_TRIM | SWT.RESIZE | SWT.APPLICATION_MODAL);
        this.filters = filters;
    }

    @Override
    protected Point getInitialSize() {
        return getShell().computeSize(SWT.DEFAULT, filters.size() * ROW_HEIGHT + textHeight + 100, true);
    }

    @Override
    protected Control createDialogArea(Composite parent) {
        Composite composite = (Composite) super.createDialogArea(parent);

        getShell().setText("Select action");

        viewer = new TableViewer(composite, SWT.BORDER);
        GridData gridData = new GridData(SWT.FILL, SWT.FILL, true, true);
        viewer.getTable().setLayoutData(gridData);

        text = new Text(composite, SWT.READ_ONLY | SWT.MULTI | SWT.WRAP);
        gridData = new GridData(SWT.FILL, SWT.NONE, true, false);
        GC gc = new GC(text);
        try {
            gc.setFont(text.getFont());
            FontMetrics fm = gc.getFontMetrics();
            textHeight = 4 * fm.getHeight();
            gridData.heightHint = textHeight;
        } finally {
            gc.dispose();
        }
        text.setLayoutData(gridData);

        viewer.setContentProvider(new ArrayContentProvider());
        viewer.setLabelProvider(new IntentSelectionDialogTableLabelProvider());
        viewer.getTable().addListener(SWT.MeasureItem, new Listener() {
            @Override
            public void handleEvent(Event event) {
                event.height = ROW_HEIGHT;
            }
        });
        viewer.setInput(filters);
        viewer.addSelectionChangedListener(new ISelectionChangedListener() {
            @Override
            public void selectionChanged(SelectionChangedEvent event) {
                updateSelection();
            }
        });
        viewer.getTable().select(0);
        updateSelection();

        return composite;
    }

    private void updateSelection() {
        selectedIndex = viewer.getTable().getSelectionIndex();
        IntentFilter filter = (IntentFilter) ((StructuredSelection) viewer.getSelection()).getFirstElement();
        if (filter != null) {
            text.setText(filter.getDescription());
        }
    }

    public int getSelectedIndex() {
        return selectedIndex;
    }

    public void setSelectedIndex(int selectedIndex) {
        this.selectedIndex = selectedIndex;
    }

    public static class Factory {
        @Inject
        @Named(IServiceConstants.ACTIVE_SHELL)
        private Shell shell;

        public IntentSelectionDialog create(Intent intent, List<IntentFilter> filters) {
            return new IntentSelectionDialog(shell, intent, filters);
        }
    }
}