org.eclipse.tm4e.languageconfiguration.internal.widgets.CharacterPairsTableWidget.java Source code

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Here is the source code for org.eclipse.tm4e.languageconfiguration.internal.widgets.CharacterPairsTableWidget.java

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/**
 *  Copyright (c) 2018 Red Hat Inc. and others.
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 *  Contributors:
 *  Lucas Bullen (Red Hat Inc.) - initial API and implementation
 */
package org.eclipse.tm4e.languageconfiguration.internal.widgets;

import java.util.Collections;
import java.util.List;

import org.eclipse.jface.layout.TableColumnLayout;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.viewers.ColumnWeightData;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.tm4e.languageconfiguration.internal.LanguageConfigurationMessages;
import org.eclipse.tm4e.languageconfiguration.internal.supports.CharacterPair;

public class CharacterPairsTableWidget extends TableViewer {

    public CharacterPairsTableWidget(Table table) {
        super(table);
        setContentProvider(new CharacterPairContentProvider());
        setLabelProvider(new CharacterPairLabelProvider());

        GC gc = new GC(table.getShell());
        gc.setFont(JFaceResources.getDialogFont());
        TableColumnLayout columnLayout = new TableColumnLayout();

        TableColumn column1 = new TableColumn(table, SWT.NONE);
        column1.setText(LanguageConfigurationMessages.CharacterPairsTableWidget_start);
        int minWidth = computeMinimumColumnWidth(gc, LanguageConfigurationMessages.CharacterPairsTableWidget_start);
        columnLayout.setColumnData(column1, new ColumnWeightData(2, minWidth, true));

        TableColumn column2 = new TableColumn(table, SWT.NONE);
        column2.setText(LanguageConfigurationMessages.CharacterPairsTableWidget_end);
        minWidth = computeMinimumColumnWidth(gc, LanguageConfigurationMessages.CharacterPairsTableWidget_end);
        columnLayout.setColumnData(column2, new ColumnWeightData(2, minWidth, true));
    }

    protected int computeMinimumColumnWidth(GC gc, String string) {
        return gc.stringExtent(string).x + 10;
    }

    protected class CharacterPairContentProvider implements IStructuredContentProvider {

        private List<CharacterPair> characterPairList;

        @Override
        public Object[] getElements(Object input) {
            return characterPairList.toArray(new CharacterPair[characterPairList.size()]);
        }

        @SuppressWarnings("unchecked")
        @Override
        public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
            if (newInput == null) {
                characterPairList = Collections.EMPTY_LIST;
            } else {
                characterPairList = (List<CharacterPair>) newInput;
            }
        }

        @Override
        public void dispose() {
            characterPairList = null;
        }
    }

    protected class CharacterPairLabelProvider extends LabelProvider implements ITableLabelProvider {

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

        @Override
        public String getText(Object element) {
            return getColumnText(element, 0);
        }

        @Override
        public String getColumnText(Object element, int columnIndex) {
            CharacterPair pair = (CharacterPair) element;

            switch (columnIndex) {
            case 0:
                return pair.getKey();
            case 1:
                return pair.getValue();
            default:
                return ""; //$NON-NLS-1$
            }
        }
    }

}