org.jboss.tools.struts.validator.ui.wizard.key.AbstractResourcePathView.java Source code

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Here is the source code for org.jboss.tools.struts.validator.ui.wizard.key.AbstractResourcePathView.java

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/*******************************************************************************
 * Copyright (c) 2007 Exadel, Inc. and Red Hat, Inc.
 * Distributed under license by Red Hat, Inc. All rights reserved.
 * This program is 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:
 *     Exadel, Inc. and Red Hat, Inc. - initial API and implementation
 ******************************************************************************/
package org.jboss.tools.struts.validator.ui.wizard.key;

import java.text.MessageFormat;
import java.util.*;
import org.jboss.tools.common.model.ui.action.CommandBar;
import org.jboss.tools.common.model.ui.action.CommandBarListener;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.jboss.tools.common.model.*;
import org.jboss.tools.struts.validator.ui.Messages;

public abstract class AbstractResourcePathView implements CommandBarListener, SelectionListener {
    protected CommandBar commandBar = new CommandBar();
    protected Combo combo;
    protected String selected = null;
    protected PathListener listener = null;
    protected XModel model;
    protected XModelObject object;
    private boolean lock = false;

    public AbstractResourcePathView() {
    }

    public void addPathListener(PathListener listener) {
        this.listener = listener;
    }

    public Control createControl(Composite parent) {
        Composite composite = new Composite(parent, SWT.NONE);
        GridLayout layout = new GridLayout(3, false);
        layout.horizontalSpacing = 10;
        layout.marginHeight = 0;
        layout.verticalSpacing = 0;
        layout.marginWidth = 0;
        composite.setLayout(layout);

        Label label = new Label(composite, SWT.NONE);
        label.setText(MessageFormat.format(Messages.AbstractResourcePathView_Label, getDisplayName()));

        combo = new Combo(composite, SWT.BORDER | SWT.READ_ONLY);
        GridData d = new GridData(GridData.FILL_HORIZONTAL);
        combo.setLayoutData(d);
        populateCombo();
        if (combo.getItemCount() > 0)
            combo.setText(combo.getItem(0));

        combo.addSelectionListener(this);

        commandBar.setMnemonicEnabled(true);
        commandBar.setCommands(new String[] { Messages.AbstractResourcePathView_Browse });
        commandBar.addCommandBarListener(this);
        commandBar.getLayout().setMargins(0, 0, 0, 0);
        commandBar.getLayout().buttonWidth = convertHorizontalDLUsToPixels(parent, IDialogConstants.BUTTON_WIDTH);
        commandBar.createControl(composite);

        return composite;
    }

    protected abstract Vector<String> history();

    protected abstract String[] getRequiredValues();

    protected int convertHorizontalDLUsToPixels(Control control, int dlus) {
        GC gc = new GC(control);
        gc.setFont(control.getFont());
        int averageWidth = gc.getFontMetrics().getAverageCharWidth();
        gc.dispose();
        double horizontalDialogUnitSize = averageWidth * 0.25;
        return (int) Math.round(dlus * horizontalDialogUnitSize);
    }

    protected abstract String getDisplayName();

    public void setObject(Object data) {
        lock = true;
        Properties p = (Properties) data;
        model = (XModel) p.get("model"); //$NON-NLS-1$
        object = (XModelObject) p.get("object"); //$NON-NLS-1$
        lock = false;
        updateSelection();
    }

    public void updateSelection() {
        if (lock || combo == null)
            return;
        int i = combo.getSelectionIndex();
        String s = (i < 0) ? null : combo.getItem(i);
        if (selected == s || (selected != null && selected.equals(s)))
            return;
        selected = s;
        fireSelectionChanged();
    }

    private void fireSelectionChanged() {
        if (listener != null)
            listener.objectSelected(getSelectedFile());
    }

    protected XModelObject getSelectedFile() {
        int i = combo.getSelectionIndex();
        String s = (i < 0) ? null : combo.getItem(i);
        return (s == null || model == null) ? null : model.getByPath(s);
    }

    protected void addValue(String s) {
        lock = true;
        Vector<String> history = history();
        history.remove(s);
        history.insertElementAt(s, 0);
        populateCombo();
        if (history.size() > 0)
            combo.setText(s);
        lock = false;
        updateSelection();
    }

    protected void populateCombo() {
        Vector<String> history = history();
        combo.removeAll();
        String[] vs = getRequiredValues();
        Set<String> used = new HashSet<String>();
        for (int i = 0; i < vs.length; i++) {
            if (used.contains(vs[i]))
                continue;
            used.add(vs[i]);
            combo.add(vs[i]);
        }
        for (int i = 0; i < history.size(); i++) {
            String v = history.elementAt(i).toString();
            if (used.contains(v))
                continue;
            used.add(v);
            combo.add(v);
        }
    }

    public void widgetSelected(SelectionEvent e) {
        updateSelection();
    }

    public void widgetDefaultSelected(SelectionEvent e) {
    }

}