name.schedenig.eclipse.grepconsole.view.DefaultSizeDialog.java Source code

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Here is the source code for name.schedenig.eclipse.grepconsole.view.DefaultSizeDialog.java

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/*******************************************************************************
 * Copyright (c) 2008 - 2014 Marian Schedenig
 * 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:
 *    Marian Schedenig - initial API and implementation
 *******************************************************************************/

package name.schedenig.eclipse.grepconsole.view;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.jface.dialogs.TrayDialog;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;

/**
 * A dialog that can provide a default size for use when no preferred size has
 * been persisted in the dialog settings.
 * 
 * Mostly copies code from Dialog, which implements most of the necessary
 * functionality where it cannot be changed.
 *  
 * @author msched
 */
public class DefaultSizeDialog extends TrayDialog {
    /** These are copied from Dialog class, where they are private. */
    public static final String DIALOG_FONT_DATA = "DIALOG_FONT_NAME"; //$NON-NLS-1$
    public static final String DIALOG_WIDTH = "DIALOG_WIDTH"; //$NON-NLS-1$
    public static final String DIALOG_HEIGHT = "DIALOG_HEIGHT"; //$NON-NLS-1$

    /**
     * Creates a new instance.
     * 
     * @param parentShell Parent shell.
     */
    public DefaultSizeDialog(Shell parentShell) {
        super(parentShell);
    }

    /**
     * @see org.eclipse.jface.dialogs.Dialog#createContents(org.eclipse.swt.widgets.Composite)
     */
    @Override
    protected Control createContents(Composite parent) {
        Control contents = super.createContents(parent);
        Dialog.applyDialogFont(parent);

        return contents;
    }

    /**
     * Mostly a copy of the same method in Dialog, but with a call to a separate
     * method for providing a default size that is used if no persisted dialog
     * settings are available.
     * 
     * @see org.eclipse.jface.dialogs.Dialog#getInitialSize()
     */
    @Override
    protected Point getInitialSize() {
        Point result = getDefaultSize();

        if ((getDialogBoundsStrategy() & DIALOG_PERSISTSIZE) != 0) {
            IDialogSettings settings = getDialogBoundsSettings();

            if (settings != null) {
                boolean useStoredBounds = true;
                String previousDialogFontData = settings.get(DIALOG_FONT_DATA);

                if (previousDialogFontData != null && previousDialogFontData.length() > 0) {
                    FontData[] fontDatas = JFaceResources.getDialogFont().getFontData();

                    if (fontDatas.length > 0) {
                        String currentDialogFontData = fontDatas[0].toString();
                        useStoredBounds = currentDialogFontData.equalsIgnoreCase(previousDialogFontData);
                    }
                }

                if (useStoredBounds) {
                    try {
                        int width = settings.getInt(DIALOG_WIDTH);
                        int height = settings.getInt(DIALOG_HEIGHT);

                        if (width != DIALOG_DEFAULT_BOUNDS) {
                            result.x = width;
                        }

                        if (height != DIALOG_DEFAULT_BOUNDS) {
                            result.y = height;
                        }
                    } catch (NumberFormatException e) {
                    }
                }
            }
        }

        return result;
    }

    /**
     * Provides the dialog's default size. Duplicates the behaviour of JFace's
     * standard dialog. Subclasses may override.
     * 
     * @return Default size.
     */
    protected Point getDefaultSize() {
        return getShell().computeSize(SWT.DEFAULT, SWT.DEFAULT, true);
    }
}