uk.ac.gda.client.UIHelper.java Source code

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Here is the source code for uk.ac.gda.client.UIHelper.java

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/*-
 * Copyright  2013 Diamond Light Source Ltd.
 *
 * This file is part of GDA.
 *
 * GDA is free software: you can redistribute it and/or modify it under the
 * terms of the GNU General Public License version 3 as published by the Free
 * Software Foundation.
 *
 * GDA is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along
 * with GDA. If not, see <http://www.gnu.org/licenses/>.
 */

package uk.ac.gda.client;

import java.util.Random;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.ExpandBar;
import org.eclipse.swt.widgets.ExpandItem;

public class UIHelper {
    private UIHelper() {
    }

    public static void showError(final String message, final String reason) {
        showMessage(MessageDialog.ERROR, message, reason);
    }

    public static void showWarning(final String message, final String reason) {
        showMessage(MessageDialog.WARNING, message, reason);
    }

    private static void showMessage(final int messageDialogType, final String message, final String reason) {
        Display.getDefault().syncExec(new Runnable() {
            @Override
            public void run() {
                StringBuilder messageString = new StringBuilder();
                messageString.append(message);
                if (reason != null) {
                    messageString.append("\n\nReason:\n" + reason);
                }
                if (messageDialogType == MessageDialog.ERROR) {
                    MessageDialog.openError(Display.getDefault().getActiveShell(), "Error",
                            messageString.toString());
                } else if (messageDialogType == MessageDialog.WARNING) {
                    MessageDialog.openWarning(Display.getDefault().getActiveShell(), "Warning",
                            messageString.toString());
                }
            }
        });
    }

    public static GridLayout createGridLayoutWithNoMargin(int columns, boolean equal) {
        GridLayout layout = new GridLayout(columns, equal);
        layout.marginBottom = 0;
        layout.marginHeight = 0;
        layout.marginWidth = 0;
        layout.marginLeft = 0;
        layout.marginTop = 0;
        return layout;
    }

    public static void revalidateLayout(Control control) {
        Control c = control;
        do {
            if (c instanceof ExpandBar) {
                ExpandBar expandBar = (ExpandBar) c;
                for (ExpandItem expandItem : expandBar.getItems()) {
                    expandItem.setHeight(
                            expandItem.getControl().computeSize(expandBar.getSize().x, SWT.DEFAULT, true).y);
                }
            }
            c = c.getParent();
        } while (c != null && c.getParent() != null && !(c instanceof ScrolledComposite));
        if (c instanceof ScrolledComposite) {
            ScrolledComposite scrolledComposite = (ScrolledComposite) c;
            if (scrolledComposite.getExpandHorizontal() || scrolledComposite.getExpandVertical()) {
                scrolledComposite
                        .setMinSize(scrolledComposite.getContent().computeSize(SWT.DEFAULT, SWT.DEFAULT, true));
            } else {
                scrolledComposite.getContent().pack(true);
            }
        }
        if (c instanceof Composite) {
            Composite composite = (Composite) c;
            composite.layout(true, true);
        }
    }

    public static Color convertHexadecimalToColor(String hexadecimal, Display display)
            throws NumberFormatException {
        java.awt.Color col = null;
        try {
            col = java.awt.Color.decode(hexadecimal);
        } catch (Exception e) {
            col = java.awt.Color.WHITE;
        }
        int red = col.getRed();
        int blue = col.getBlue();
        int green = col.getGreen();

        return new Color(display, new RGB(red, green, blue));
    }

    public static String convertRGBToHexadecimal(RGB rgb) {
        int red = rgb.red;
        int green = rgb.green;
        int blue = rgb.blue;
        String redHexadecimal = Integer.toHexString(red);
        String greenHexadecimal = Integer.toHexString(green);
        String blueHexadecimal = Integer.toHexString(blue);
        if (redHexadecimal.length() == 1) {
            redHexadecimal = "0" + redHexadecimal;
        }
        if (greenHexadecimal.length() == 1) {
            greenHexadecimal = "0" + greenHexadecimal;
        }
        if (blueHexadecimal.length() == 1) {
            blueHexadecimal = "0" + blueHexadecimal;
        }
        return "#" + redHexadecimal + greenHexadecimal + blueHexadecimal;
    }

    public static String getRandomColor() {
        Random rand = new Random();
        float r = rand.nextFloat();
        float g = rand.nextFloat();
        float b = rand.nextFloat();
        String hex = Integer.toHexString(new java.awt.Color(r, g, b).getRGB() & 0xffffff);
        if (hex.length() < 6) {
            hex = "0" + hex;
        }
        hex = "#" + hex;
        return hex;
    }
}