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app/src/main/groovy/org/jd/gui/util/swing/SwingUtil.groovy
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| /* | ||
| * Copyright (c) 2008-2015 Emmanuel Dupuy | ||
| * This program is made available under the terms of the GPLv3 License. | ||
| */ | ||
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| package org.jd.gui.util.swing | ||
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| import groovy.transform.CompileStatic | ||
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| import javax.swing.JComponent | ||
| import javax.swing.JPopupMenu | ||
| import javax.swing.JSeparator | ||
| import javax.swing.LookAndFeel | ||
| import javax.swing.UIManager | ||
| import java.lang.reflect.Field | ||
| import java.lang.reflect.Method | ||
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| /** | ||
| * See: https://www.ailis.de/~k/archives/67-Workaround-for-borderless-Java-Swing-menus-on-Linux.html | ||
| */ | ||
| @CompileStatic | ||
| class SwingUtil { | ||
| /* | ||
| * This is free and unencumbered software released into the public domain. | ||
| * | ||
| * Anyone is free to copy, modify, publish, use, compile, sell, or | ||
| * distribute this software, either in source code form or as a compiled | ||
| * binary, for any purpose, commercial or non-commercial, and by any | ||
| * means. | ||
| * | ||
| * In jurisdictions that recognize copyright laws, the author or authors | ||
| * of this software dedicate any and all copyright interest in the | ||
| * software to the public domain. We make this dedication for the benefit | ||
| * of the public at large and to the detriment of our heirs and | ||
| * successors. We intend this dedication to be an overt act of | ||
| * relinquishment in perpetuity of all present and future rights to this | ||
| * software under copyright law. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | ||
| * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR | ||
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | ||
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | ||
| * OTHER DEALINGS IN THE SOFTWARE. | ||
| * | ||
| * For more information, please refer to <http://unlicense.org/> | ||
| */ | ||
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| /** | ||
| * Swing menus are looking pretty bad on Linux when the GTK LaF is used (See | ||
| * bug #6925412). It will most likely never be fixed anytime soon so this | ||
| * method provides a workaround for it. It uses reflection to change the GTK | ||
| * style objects of Swing so popup menu borders have a minimum thickness of | ||
| * 1 and menu separators have a minimum vertical thickness of 1. | ||
| */ | ||
| public static void installGtkPopupBugWorkaround() { | ||
| // Get current look-and-feel implementation class | ||
| LookAndFeel laf = UIManager.getLookAndFeel(); | ||
| Class<?> lafClass = laf.getClass(); | ||
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| // Do nothing when not using the problematic LaF | ||
| if (!lafClass.getName().equals("com.sun.java.swing.plaf.gtk.GTKLookAndFeel")) return; | ||
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| // We do reflection from here on. Failure is silently ignored. The | ||
| // workaround is simply not installed when something goes wrong here | ||
| try { | ||
| // Access the GTK style factory | ||
| Field field = lafClass.getDeclaredField("styleFactory"); | ||
| boolean accessible = field.isAccessible(); | ||
| field.setAccessible(true); | ||
| Object styleFactory = field.get(laf); | ||
| field.setAccessible(accessible); | ||
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| // Fix the horizontal and vertical thickness of popup menu style | ||
| Object style = getGtkStyle(styleFactory, new JPopupMenu(), "POPUP_MENU"); | ||
| fixGtkThickness(style, "yThickness"); | ||
| fixGtkThickness(style, "xThickness"); | ||
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| // Fix the vertical thickness of the popup menu separator style | ||
| style = getGtkStyle(styleFactory, new JSeparator(), "POPUP_MENU_SEPARATOR"); | ||
| fixGtkThickness(style, "yThickness"); | ||
| } catch (Exception e) { | ||
| // Silently ignored. Workaround can't be applied. | ||
| } | ||
| } | ||
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| /** | ||
| * Called internally by installGtkPopupBugWorkaround to fix the thickness | ||
| * of a GTK style field by setting it to a minimum value of 1. | ||
| * | ||
| * @param style | ||
| * The GTK style object. | ||
| * @param fieldName | ||
| * The field name. | ||
| * @throws Exception | ||
| * When reflection fails. | ||
| */ | ||
| private static void fixGtkThickness(Object style, String fieldName) throws Exception { | ||
| Field field = style.getClass().getDeclaredField(fieldName); | ||
| boolean accessible = field.isAccessible(); | ||
| field.setAccessible(true); | ||
| field.setInt(style, Math.max(1, field.getInt(style))); | ||
| field.setAccessible(accessible); | ||
| } | ||
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| /** | ||
| * Called internally by installGtkPopupBugWorkaround. Returns a specific | ||
| * GTK style object. | ||
| * | ||
| * @param styleFactory | ||
| * The GTK style factory. | ||
| * @param component | ||
| * The target component of the style. | ||
| * @param regionName | ||
| * The name of the target region of the style. | ||
| * @return The GTK style. | ||
| * @throws Exception | ||
| * When reflection fails. | ||
| */ | ||
| private static Object getGtkStyle(Object styleFactory, JComponent component, String regionName) throws Exception { | ||
| // Create the region object | ||
| Class<?> regionClass = Class.forName("javax.swing.plaf.synth.Region"); | ||
| Field field = regionClass.getField(regionName); | ||
| Object region = field.get(regionClass); | ||
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| // Get and return the style | ||
| Class<?> styleFactoryClass = styleFactory.getClass(); | ||
| Method method = styleFactoryClass.getMethod("getStyle", JComponent.class, regionClass); | ||
| boolean accessible = method.isAccessible(); | ||
| method.setAccessible(true); | ||
| Object style = method.invoke(styleFactory, component, region); | ||
| method.setAccessible(accessible); | ||
| return style; | ||
| } | ||
| } |
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