tern.eclipse.ide.server.nodejs.internal.ui.preferences.StringButtonComboFieldEditor.java Source code

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Here is the source code for tern.eclipse.ide.server.nodejs.internal.ui.preferences.StringButtonComboFieldEditor.java

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/**
 *  Copyright (c) 2013-2014 Angelo ZERR.
 *  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:
 *  Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation
 */
package tern.eclipse.ide.server.nodejs.internal.ui.preferences;

import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Shell;

public abstract class StringButtonComboFieldEditor extends StringComboFieldEditor {
    private Button changeButton;
    private String changeButtonText;

    protected StringButtonComboFieldEditor(String[] items) {
        super(items);
    }

    protected StringButtonComboFieldEditor(String name, String labelText, String[] items, Composite parent) {
        super(items);
        init(name, labelText);
        createControl(parent);
    }

    protected void adjustForNumColumns(int numColumns) {
        ((GridData) getTextControl().getLayoutData()).horizontalSpan = (numColumns - 2);
    }

    protected abstract String changePressed();

    protected void doFillIntoGrid(Composite parent, int numColumns) {
        super.doFillIntoGrid(parent, numColumns - 1);
        this.changeButton = getChangeControl(parent);
        GridData gd = new GridData();
        gd.horizontalAlignment = 4;
        int widthHint = convertHorizontalDLUsToPixels(this.changeButton, 61);
        gd.widthHint = Math.max(widthHint, this.changeButton.computeSize(-1, -1, true).x);
        this.changeButton.setLayoutData(gd);
    }

    protected Button getChangeControl(Composite parent) {
        if (this.changeButton == null) {
            this.changeButton = new Button(parent, 8);
            if (this.changeButtonText == null) {
                this.changeButtonText = JFaceResources.getString("openChange");
            }
            this.changeButton.setText(this.changeButtonText);
            this.changeButton.setFont(parent.getFont());
            this.changeButton.addSelectionListener(new SelectionAdapter() {
                public void widgetSelected(SelectionEvent evt) {
                    String newValue = StringButtonComboFieldEditor.this.changePressed();
                    if (newValue != null)
                        StringButtonComboFieldEditor.this.setStringValue(newValue);
                }
            });
            this.changeButton.addDisposeListener(new DisposeListener() {
                public void widgetDisposed(DisposeEvent event) {
                    StringButtonComboFieldEditor.this.changeButton = null;
                }
            });
        } else {
            checkParent(this.changeButton, parent);
        }
        return this.changeButton;
    }

    public int getNumberOfControls() {
        return 3;
    }

    protected Shell getShell() {
        if (this.changeButton == null) {
            return null;
        }
        return this.changeButton.getShell();
    }

    public void setChangeButtonText(String text) {
        Assert.isNotNull(text);
        this.changeButtonText = text;
        if (this.changeButton != null) {
            this.changeButton.setText(text);
            Point prefSize = this.changeButton.computeSize(-1, -1);
            GridData data = (GridData) this.changeButton.getLayoutData();
            data.widthHint = Math.max(-1, prefSize.x);
        }
    }

    public void setEnabled(boolean enabled, Composite parent) {
        super.setEnabled(enabled, parent);
        if (this.changeButton != null)
            this.changeButton.setEnabled(enabled);
    }
}