com.roumanoff.debug.sourceprovider.VariableComposite.java Source code

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Here is the source code for com.roumanoff.debug.sourceprovider.VariableComposite.java

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/*
 * Copyright 2008 Patrick Roumanoff
 *
 *  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 com.roumanoff.debug.sourceprovider;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;

/**
 * Display a list of SourceValue in alphabetical order.<br>
 * the control get notified of new through call to the notifyUpdate method
 * 
 * @author Patrick Roumanoff
 * 
 */
public class VariableComposite extends Composite {

    private TableViewer viewer;
    private List<SourceValue> list = new ArrayList<SourceValue>();

    public VariableComposite(Composite parent, int style) {
        super(parent, style);
        this.setLayout(new FillLayout());
        viewer = new TableViewer(this, SWT.SINGLE | SWT.FULL_SELECTION | SWT.H_SCROLL | SWT.V_SCROLL);
        viewer.setContentProvider(new ArrayContentProvider());
        viewer.setLabelProvider(new SourceLabelProvider());
        viewer.setComparator(new ViewerComparator());
        Table table = viewer.getTable();
        table.setHeaderVisible(true);
        table.setLinesVisible(true);
        TableColumn tc = new TableColumn(table, SWT.NONE);
        tc.setText("Name");
        tc.setWidth(200);
        tc = new TableColumn(table, SWT.NONE);
        tc.setText("Value");
        tc.setWidth(300);
        tc = new TableColumn(table, SWT.NONE);
        tc.setText("Priority");
        tc.setWidth(100);
        viewer.setInput(list);
    }

    /**
     * either add the new value to the list or update current value if already
     * present
     */
    public void notifyUpdate(SourceValue source) {
        for (SourceValue s : list) {
            if (s.name.equals(source.name)) {
                if (source.name.equals("selection") && source.getValue().startsWith("[[selection:")) {
                    return; // avoid infinite loop. the current selection is the selection variable !
                }
                s.priority = source.priority;
                s.value = source.value;
                viewer.refresh();
                return;
            }
        }
        list.add(source);
        viewer.refresh();
    }

    /** display a value across three column: name, value and priority */
    class SourceLabelProvider extends LabelProvider implements ITableLabelProvider {
        public String getColumnText(Object obj, int index) {
            SourceValue source = (SourceValue) obj;
            switch (index) {
            case 0:
                return source.getName();
            case 1:
                return source.getValue();
            case 2:
                return source.getPriority();
            default:
                return "#N/A";
            }
        }

        public Image getColumnImage(Object element, int columnIndex) {
            return null;
        }
    }

    /**
     * expose the viewer as a selection provider<br>
     * There is no real need for this one except to demo the current selection
     * variable on itself
     */
    public ISelectionProvider getSelectionProvider() {
        return viewer;
    }

}