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Java example source code file (Region.java)

This example Java source code file (Region.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

awt, button, gui, label, list, map, object, panel, region, separator, slider, spinner, string, swing, table, tree, util, viewport

The Region.java Java example source code

/*
 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package javax.swing.plaf.synth;

import sun.awt.AppContext;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import javax.swing.JComponent;
import javax.swing.UIDefaults;

/**
 * A distinct rendering area of a Swing component.  A component may
 * support one or more regions.  Specific component regions are defined
 * by the typesafe enumeration in this class.
 * <p>
 * Regions are typically used as a way to identify the <code>Components
 * and areas a particular style is to apply to. Synth's file format allows you
 * to bind styles based on the name of a <code>Region.
 * The name is derived from the field name of the constant:
 * <ol>
 *  <li>Map all characters to lowercase.
 *  <li>Map the first character to uppercase.
 *  <li>Map the first character after underscores to uppercase.
 *  <li>Remove all underscores.
 * </ol>
 * For example, to identify the <code>SPLIT_PANE
 * <code>Region you would use SplitPane.
 * The following shows a custom <code>SynthStyleFactory
 * that returns a specific style for split panes:
 * <pre>
 *    public SynthStyle getStyle(JComponent c, Region id) {
 *        if (id == Region.SPLIT_PANE) {
 *            return splitPaneStyle;
 *        }
 *        ...
 *    }
 * </pre>
 * The following <a href="doc-files/synthFileFormat.html">xml
 * accomplishes the same thing:
 * <pre>
 * <style id="splitPaneStyle">
 *   ...
 * </style>
 * <bind style="splitPaneStyle" type="region" key="SplitPane"/>
 * </pre>
 *
 * @since 1.5
 * @author Scott Violet
 */
public class Region {
    private static final Object UI_TO_REGION_MAP_KEY = new Object();
    private static final Object LOWER_CASE_NAME_MAP_KEY = new Object();

    /**
     * ArrowButton's are special types of buttons that also render a
     * directional indicator, typically an arrow. ArrowButtons are used by
     * composite components, for example ScrollBar's contain ArrowButtons.
     * To bind a style to this <code>Region use the name
     * <code>ArrowButton.
     */
    public static final Region ARROW_BUTTON = new Region("ArrowButton", false);

    /**
     * Button region. To bind a style to this <code>Region use the name
     * <code>Button.
     */
    public static final Region BUTTON = new Region("Button", false);

    /**
     * CheckBox region. To bind a style to this <code>Region use the name
     * <code>CheckBox.
     */
    public static final Region CHECK_BOX = new Region("CheckBox", false);

    /**
     * CheckBoxMenuItem region. To bind a style to this <code>Region use
     * the name <code>CheckBoxMenuItem.
     */
    public static final Region CHECK_BOX_MENU_ITEM = new Region("CheckBoxMenuItem", false);

    /**
     * ColorChooser region. To bind a style to this <code>Region use
     * the name <code>ColorChooser.
     */
    public static final Region COLOR_CHOOSER = new Region("ColorChooser", false);

    /**
     * ComboBox region. To bind a style to this <code>Region use
     * the name <code>ComboBox.
     */
    public static final Region COMBO_BOX = new Region("ComboBox", false);

    /**
     * DesktopPane region. To bind a style to this <code>Region use
     * the name <code>DesktopPane.
     */
    public static final Region DESKTOP_PANE = new Region("DesktopPane", false);

    /**
     * DesktopIcon region. To bind a style to this <code>Region use
     * the name <code>DesktopIcon.
     */
    public static final Region DESKTOP_ICON = new Region("DesktopIcon", false);

    /**
     * EditorPane region. To bind a style to this <code>Region use
     * the name <code>EditorPane.
     */
    public static final Region EDITOR_PANE = new Region("EditorPane", false);

    /**
     * FileChooser region. To bind a style to this <code>Region use
     * the name <code>FileChooser.
     */
    public static final Region FILE_CHOOSER = new Region("FileChooser", false);

    /**
     * FormattedTextField region. To bind a style to this <code>Region use
     * the name <code>FormattedTextField.
     */
    public static final Region FORMATTED_TEXT_FIELD = new Region("FormattedTextField", false);

    /**
     * InternalFrame region. To bind a style to this <code>Region use
     * the name <code>InternalFrame.
     */
    public static final Region INTERNAL_FRAME = new Region("InternalFrame", false);

    /**
     * TitlePane of an InternalFrame. The TitlePane typically
     * shows a menu, title, widgets to manipulate the internal frame.
     * To bind a style to this <code>Region use the name
     * <code>InternalFrameTitlePane.
     */
    public static final Region INTERNAL_FRAME_TITLE_PANE = new Region("InternalFrameTitlePane", false);

    /**
     * Label region. To bind a style to this <code>Region use the name
     * <code>Label.
     */
    public static final Region LABEL = new Region("Label", false);

    /**
     * List region. To bind a style to this <code>Region use the name
     * <code>List.
     */
    public static final Region LIST = new Region("List", false);

    /**
     * Menu region. To bind a style to this <code>Region use the name
     * <code>Menu.
     */
    public static final Region MENU = new Region("Menu", false);

    /**
     * MenuBar region. To bind a style to this <code>Region use the name
     * <code>MenuBar.
     */
    public static final Region MENU_BAR = new Region("MenuBar", false);

    /**
     * MenuItem region. To bind a style to this <code>Region use the name
     * <code>MenuItem.
     */
    public static final Region MENU_ITEM = new Region("MenuItem", false);

    /**
     * Accelerator region of a MenuItem. To bind a style to this
     * <code>Region use the name MenuItemAccelerator.
     */
    public static final Region MENU_ITEM_ACCELERATOR = new Region("MenuItemAccelerator", true);

    /**
     * OptionPane region. To bind a style to this <code>Region use
     * the name <code>OptionPane.
     */
    public static final Region OPTION_PANE = new Region("OptionPane", false);

    /**
     * Panel region. To bind a style to this <code>Region use the name
     * <code>Panel.
     */
    public static final Region PANEL = new Region("Panel", false);

    /**
     * PasswordField region. To bind a style to this <code>Region use
     * the name <code>PasswordField.
     */
    public static final Region PASSWORD_FIELD = new Region("PasswordField", false);

    /**
     * PopupMenu region. To bind a style to this <code>Region use
     * the name <code>PopupMenu.
     */
    public static final Region POPUP_MENU = new Region("PopupMenu", false);

    /**
     * PopupMenuSeparator region. To bind a style to this <code>Region
     * use the name <code>PopupMenuSeparator.
     */
    public static final Region POPUP_MENU_SEPARATOR = new Region("PopupMenuSeparator", false);

    /**
     * ProgressBar region. To bind a style to this <code>Region
     * use the name <code>ProgressBar.
     */
    public static final Region PROGRESS_BAR = new Region("ProgressBar", false);

    /**
     * RadioButton region. To bind a style to this <code>Region
     * use the name <code>RadioButton.
     */
    public static final Region RADIO_BUTTON = new Region("RadioButton", false);

    /**
     * RegionButtonMenuItem region. To bind a style to this <code>Region
     * use the name <code>RadioButtonMenuItem.
     */
    public static final Region RADIO_BUTTON_MENU_ITEM = new Region("RadioButtonMenuItem", false);

    /**
     * RootPane region. To bind a style to this <code>Region use
     * the name <code>RootPane.
     */
    public static final Region ROOT_PANE = new Region("RootPane", false);

    /**
     * ScrollBar region. To bind a style to this <code>Region use
     * the name <code>ScrollBar.
     */
    public static final Region SCROLL_BAR = new Region("ScrollBar", false);

    /**
     * Track of the ScrollBar. To bind a style to this <code>Region use
     * the name <code>ScrollBarTrack.
     */
    public static final Region SCROLL_BAR_TRACK = new Region("ScrollBarTrack", true);

    /**
     * Thumb of the ScrollBar. The thumb is the region of the ScrollBar
     * that gives a graphical depiction of what percentage of the View is
     * currently visible. To bind a style to this <code>Region use
     * the name <code>ScrollBarThumb.
     */
    public static final Region SCROLL_BAR_THUMB = new Region("ScrollBarThumb", true);

    /**
     * ScrollPane region. To bind a style to this <code>Region use
     * the name <code>ScrollPane.
     */
    public static final Region SCROLL_PANE = new Region("ScrollPane", false);

    /**
     * Separator region. To bind a style to this <code>Region use
     * the name <code>Separator.
     */
    public static final Region SEPARATOR = new Region("Separator", false);

    /**
     * Slider region. To bind a style to this <code>Region use
     * the name <code>Slider.
     */
    public static final Region SLIDER = new Region("Slider", false);

    /**
     * Track of the Slider. To bind a style to this <code>Region use
     * the name <code>SliderTrack.
     */
    public static final Region SLIDER_TRACK = new Region("SliderTrack", true);

    /**
     * Thumb of the Slider. The thumb of the Slider identifies the current
     * value. To bind a style to this <code>Region use the name
     * <code>SliderThumb.
     */
    public static final Region SLIDER_THUMB = new Region("SliderThumb", true);

    /**
     * Spinner region. To bind a style to this <code>Region use the name
     * <code>Spinner.
     */
    public static final Region SPINNER = new Region("Spinner", false);

    /**
     * SplitPane region. To bind a style to this <code>Region use the name
     * <code>SplitPane.
     */
    public static final Region SPLIT_PANE = new Region("SplitPane", false);

    /**
     * Divider of the SplitPane. To bind a style to this <code>Region
     * use the name <code>SplitPaneDivider.
     */
    public static final Region SPLIT_PANE_DIVIDER = new Region("SplitPaneDivider", true);

    /**
     * TabbedPane region. To bind a style to this <code>Region use
     * the name <code>TabbedPane.
     */
    public static final Region TABBED_PANE = new Region("TabbedPane", false);

    /**
     * Region of a TabbedPane for one tab. To bind a style to this
     * <code>Region use the name TabbedPaneTab.
     */
    public static final Region TABBED_PANE_TAB = new Region("TabbedPaneTab", true);

    /**
     * Region of a TabbedPane containing the tabs. To bind a style to this
     * <code>Region use the name TabbedPaneTabArea.
     */
    public static final Region TABBED_PANE_TAB_AREA = new Region("TabbedPaneTabArea", true);

    /**
     * Region of a TabbedPane containing the content. To bind a style to this
     * <code>Region use the name TabbedPaneContent.
     */
    public static final Region TABBED_PANE_CONTENT = new Region("TabbedPaneContent", true);

    /**
     * Table region. To bind a style to this <code>Region use
     * the name <code>Table.
     */
    public static final Region TABLE = new Region("Table", false);

    /**
     * TableHeader region. To bind a style to this <code>Region use
     * the name <code>TableHeader.
     */
    public static final Region TABLE_HEADER = new Region("TableHeader", false);

    /**
     * TextArea region. To bind a style to this <code>Region use
     * the name <code>TextArea.
     */
    public static final Region TEXT_AREA = new Region("TextArea", false);

    /**
     * TextField region. To bind a style to this <code>Region use
     * the name <code>TextField.
     */
    public static final Region TEXT_FIELD = new Region("TextField", false);

    /**
     * TextPane region. To bind a style to this <code>Region use
     * the name <code>TextPane.
     */
    public static final Region TEXT_PANE = new Region("TextPane", false);

    /**
     * ToggleButton region. To bind a style to this <code>Region use
     * the name <code>ToggleButton.
     */
    public static final Region TOGGLE_BUTTON = new Region("ToggleButton", false);

    /**
     * ToolBar region. To bind a style to this <code>Region use
     * the name <code>ToolBar.
     */
    public static final Region TOOL_BAR = new Region("ToolBar", false);

    /**
     * Region of the ToolBar containing the content. To bind a style to this
     * <code>Region use the name ToolBarContent.
     */
    public static final Region TOOL_BAR_CONTENT = new Region("ToolBarContent", true);

    /**
     * Region for the Window containing the ToolBar. To bind a style to this
     * <code>Region use the name ToolBarDragWindow.
     */
    public static final Region TOOL_BAR_DRAG_WINDOW = new Region("ToolBarDragWindow", false);

    /**
     * ToolTip region. To bind a style to this <code>Region use
     * the name <code>ToolTip.
     */
    public static final Region TOOL_TIP = new Region("ToolTip", false);

    /**
     * ToolBar separator region. To bind a style to this <code>Region use
     * the name <code>ToolBarSeparator.
     */
    public static final Region TOOL_BAR_SEPARATOR = new Region("ToolBarSeparator", false);

    /**
     * Tree region. To bind a style to this <code>Region use the name
     * <code>Tree.
     */
    public static final Region TREE = new Region("Tree", false);

    /**
     * Region of the Tree for one cell. To bind a style to this
     * <code>Region use the name TreeCell.
     */
    public static final Region TREE_CELL = new Region("TreeCell", true);

    /**
     * Viewport region. To bind a style to this <code>Region use
     * the name <code>Viewport.
     */
    public static final Region VIEWPORT = new Region("Viewport", false);

    private static Map<String, Region> getUItoRegionMap() {
        AppContext context = AppContext.getAppContext();
        Map<String, Region> map = (Map) context.get(UI_TO_REGION_MAP_KEY);
        if (map == null) {
            map = new HashMap<String, Region>();
            map.put("ArrowButtonUI", ARROW_BUTTON);
            map.put("ButtonUI", BUTTON);
            map.put("CheckBoxUI", CHECK_BOX);
            map.put("CheckBoxMenuItemUI", CHECK_BOX_MENU_ITEM);
            map.put("ColorChooserUI", COLOR_CHOOSER);
            map.put("ComboBoxUI", COMBO_BOX);
            map.put("DesktopPaneUI", DESKTOP_PANE);
            map.put("DesktopIconUI", DESKTOP_ICON);
            map.put("EditorPaneUI", EDITOR_PANE);
            map.put("FileChooserUI", FILE_CHOOSER);
            map.put("FormattedTextFieldUI", FORMATTED_TEXT_FIELD);
            map.put("InternalFrameUI", INTERNAL_FRAME);
            map.put("InternalFrameTitlePaneUI", INTERNAL_FRAME_TITLE_PANE);
            map.put("LabelUI", LABEL);
            map.put("ListUI", LIST);
            map.put("MenuUI", MENU);
            map.put("MenuBarUI", MENU_BAR);
            map.put("MenuItemUI", MENU_ITEM);
            map.put("OptionPaneUI", OPTION_PANE);
            map.put("PanelUI", PANEL);
            map.put("PasswordFieldUI", PASSWORD_FIELD);
            map.put("PopupMenuUI", POPUP_MENU);
            map.put("PopupMenuSeparatorUI", POPUP_MENU_SEPARATOR);
            map.put("ProgressBarUI", PROGRESS_BAR);
            map.put("RadioButtonUI", RADIO_BUTTON);
            map.put("RadioButtonMenuItemUI", RADIO_BUTTON_MENU_ITEM);
            map.put("RootPaneUI", ROOT_PANE);
            map.put("ScrollBarUI", SCROLL_BAR);
            map.put("ScrollPaneUI", SCROLL_PANE);
            map.put("SeparatorUI", SEPARATOR);
            map.put("SliderUI", SLIDER);
            map.put("SpinnerUI", SPINNER);
            map.put("SplitPaneUI", SPLIT_PANE);
            map.put("TabbedPaneUI", TABBED_PANE);
            map.put("TableUI", TABLE);
            map.put("TableHeaderUI", TABLE_HEADER);
            map.put("TextAreaUI", TEXT_AREA);
            map.put("TextFieldUI", TEXT_FIELD);
            map.put("TextPaneUI", TEXT_PANE);
            map.put("ToggleButtonUI", TOGGLE_BUTTON);
            map.put("ToolBarUI", TOOL_BAR);
            map.put("ToolTipUI", TOOL_TIP);
            map.put("ToolBarSeparatorUI", TOOL_BAR_SEPARATOR);
            map.put("TreeUI", TREE);
            map.put("ViewportUI", VIEWPORT);
            context.put(UI_TO_REGION_MAP_KEY, map);
        }
        return map;
    }

    private static Map<Region, String> getLowerCaseNameMap() {
        AppContext context = AppContext.getAppContext();
        Map<Region, String> map = (Map) context.get(LOWER_CASE_NAME_MAP_KEY);
        if (map == null) {
            map = new HashMap<Region, String>();
            context.put(LOWER_CASE_NAME_MAP_KEY, map);
        }
        return map;
    }

    static Region getRegion(JComponent c) {
        return getUItoRegionMap().get(c.getUIClassID());
    }

    static void registerUIs(UIDefaults table) {
        for (Object key : getUItoRegionMap().keySet()) {
            table.put(key, "javax.swing.plaf.synth.SynthLookAndFeel");
        }
    }

    private final String name;
    private final boolean subregion;

    private Region(String name, boolean subregion) {
        if (name == null) {
            throw new NullPointerException("You must specify a non-null name");
        }
        this.name = name;
        this.subregion = subregion;
    }

    /**
     * Creates a Region with the specified name. This should only be
     * used if you are creating your own <code>JComponent subclass
     * with a custom <code>ComponentUI class.
     *
     * @param name Name of the region
     * @param ui String that will be returned from
     *           <code>component.getUIClassID. This will be null
     *           if this is a subregion.
     * @param subregion Whether or not this is a subregion.
     */
    protected Region(String name, String ui, boolean subregion) {
        this(name, subregion);
        if (ui != null) {
            getUItoRegionMap().put(ui, this);
        }
    }

    /**
     * Returns true if the Region is a subregion of a Component, otherwise
     * false. For example, <code>Region.BUTTON corresponds do a
     * <code>Component so that Region.BUTTON.isSubregion()
     * returns false.
     *
     * @return true if the Region is a subregion of a Component.
     */
    public boolean isSubregion() {
        return subregion;
    }

    /**
     * Returns the name of the region.
     *
     * @return name of the Region.
     */
    public String getName() {
        return name;
    }

    /**
     * Returns the name, in lowercase.
     *
     * @return lower case representation of the name of the Region
     */
    String getLowerCaseName() {
        Map<Region, String> lowerCaseNameMap = getLowerCaseNameMap();
        String lowerCaseName = lowerCaseNameMap.get(this);
        if (lowerCaseName == null) {
            lowerCaseName = name.toLowerCase(Locale.ENGLISH);
            lowerCaseNameMap.put(this, lowerCaseName);
        }
        return lowerCaseName;
    }

    /**
     * Returns the name of the Region.
     *
     * @return name of the Region.
     */
    @Override
    public String toString() {
        return name;
    }
}

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