org.eclipse.swt.examples.controlexample.LinkTab.java Source code

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Here is the source code for org.eclipse.swt.examples.controlexample.LinkTab.java

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/*******************************************************************************
 * Copyright (c) 2000, 2014 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.examples.controlexample;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Link;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.swt.widgets.Widget;

class LinkTab extends Tab {
    /* Example widgets and groups that contain them */
    Link link1;
    Group linkGroup;

    /* Controls and resources added to the "Fonts" group */
    static final int LINK_FOREGROUND_COLOR = 3;
    Color linkForegroundColor;

    /**
     * Creates the Tab within a given instance of ControlExample.
     */
    LinkTab(ControlExample instance) {
        super(instance);
    }

    /**
     * Creates the "Example" group.
     */
    @Override
    void createExampleGroup() {
        super.createExampleGroup();

        /* Create a group for the list */
        linkGroup = new Group(exampleGroup, SWT.NONE);
        linkGroup.setLayout(new GridLayout());
        linkGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
        linkGroup.setText("Link");
    }

    /**
     * Creates the "Example" widgets.
     */
    @Override
    void createExampleWidgets() {

        /* Compute the widget style */
        int style = getDefaultStyle();
        if (borderButton.getSelection())
            style |= SWT.BORDER;

        /* Create the example widgets */
        link1 = new Link(linkGroup, style);
        link1.setText(ControlExample.getResourceString("LinkText"));
    }

    /**
     * Creates the "Style" group.
     */
    @Override
    void createStyleGroup() {
        super.createStyleGroup();

        /* Create the extra widgets */
        borderButton = new Button(styleGroup, SWT.CHECK);
        borderButton.setText("SWT.BORDER");
    }

    @Override
    void createColorAndFontGroup() {
        super.createColorAndFontGroup();

        TableItem item = new TableItem(colorAndFontTable, SWT.None);
        item.setText(ControlExample.getResourceString("Link_Foreground_Color"));

        shell.addDisposeListener(event -> {
            if (linkForegroundColor != null)
                linkForegroundColor.dispose();
            linkForegroundColor = null;
        });
    }

    @Override
    void changeFontOrColor(int index) {
        switch (index) {
        case LINK_FOREGROUND_COLOR: {
            Color oldColor = linkForegroundColor;
            if (oldColor == null)
                oldColor = link1.getLinkForeground();
            colorDialog.setRGB(oldColor.getRGB());
            RGB rgb = colorDialog.open();
            if (rgb == null)
                return;
            oldColor = linkForegroundColor;
            linkForegroundColor = new Color(display, rgb);
            setLinkForeground();
            if (oldColor != null)
                oldColor.dispose();
        }
            break;
        default:
            super.changeFontOrColor(index);
        }
    }

    void setLinkForeground() {
        if (!instance.startup) {
            link1.setLinkForeground(linkForegroundColor);
        }
        Color color = linkForegroundColor;
        if (color == null)
            color = link1.getLinkForeground();
        TableItem item = colorAndFontTable.getItem(LINK_FOREGROUND_COLOR);
        Image oldImage = item.getImage();
        if (oldImage != null)
            oldImage.dispose();
        item.setImage(colorImage(color));
    }

    @Override
    void resetColorsAndFonts() {
        super.resetColorsAndFonts();
        Color oldColor = linkForegroundColor;
        linkForegroundColor = null;
        setLinkForeground();
        if (oldColor != null)
            oldColor.dispose();
    }

    @Override
    void setExampleWidgetState() {
        super.setExampleWidgetState();
        setLinkForeground();
    }

    /**
     * Gets the "Example" widget children.
     */
    @Override
    Widget[] getExampleWidgets() {
        return new Widget[] { link1 };
    }

    /**
     * Returns a list of set/get API method names (without the set/get prefix)
     * that can be used to set/get values in the example control(s).
     */
    @Override
    String[] getMethodNames() {
        return new String[] { "Text", "ToolTipText" };
    }

    /**
     * Gets the text for the tab folder item.
     */
    @Override
    String getTabText() {
        return "Link";
    }

}