content: /*
   * Copyright 2019 FormDev Software GmbH
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package themeengine.include.com.formdev.flatlaf.ui;
  
  import java.awt.Color;
  import java.awt.EventQueue;
  import java.awt.event.FocusEvent;
  import java.awt.event.FocusListener;
  import javax.swing.JComponent;
  import javax.swing.UIManager;
  import javax.swing.plaf.ComponentUI;
  import javax.swing.plaf.basic.BasicListUI;
  
  /**
   * Provides the Flat LaF UI delegate for {@link javax.swing.JList}.
   *
   * <!-- BasicListUI -->
   *
   * @uiDefault List.font								Font
   * @uiDefault List.background						Color
   * @uiDefault List.foreground						Color
   * @uiDefault List.selectionBackground				Color
   * @uiDefault List.selectionForeground				Color
   * @uiDefault List.dropLineColor					Color
   * @uiDefault List.border							Border
   * @uiDefault List.cellRenderer						ListCellRenderer
   * @uiDefault FileChooser.listFont					Font		used if client property List.isFileList is true
   *
   * <!-- DefaultListCellRenderer -->
   *
   * @uiDefault List.cellNoFocusBorder				Border
   * @uiDefault List.focusCellHighlightBorder			Border
   * @uiDefault List.focusSelectedCellHighlightBorder	Border
   * @uiDefault List.dropCellBackground				Color
   * @uiDefault List.dropCellForeground				Color
   *
   * <!-- FlatListUI -->
   *
   * @uiDefault List.selectionInactiveBackground		Color
   * @uiDefault List.selectionInactiveForeground		Color
   *
   * <!-- FlatListCellBorder -->
   *
   * @uiDefault List.cellMargins						Insets
   * @uiDefault List.cellFocusColor					Color
   * @uiDefault List.showCellFocusIndicator			boolean
   *
   * @author Karl Tauber
   */
  public class FlatListUI
  	extends BasicListUI
  {
  	protected Color selectionBackground;
  	protected Color selectionForeground;
  	protected Color selectionInactiveBackground;
  	protected Color selectionInactiveForeground;
  
  	public static ComponentUI createUI( JComponent c ) {
  		return new FlatListUI();
  	}
  
  	@Override
  	protected void installDefaults() {
  		super.installDefaults();
  
  		selectionBackground = UIManager.getColor( "List.selectionBackground" );
  		selectionForeground = UIManager.getColor( "List.selectionForeground" );
  		selectionInactiveBackground = UIManager.getColor( "List.selectionInactiveBackground" );
  		selectionInactiveForeground = UIManager.getColor( "List.selectionInactiveForeground" );
  
  		toggleSelectionColors();
  	}
  
  	@Override
  	protected void uninstallDefaults() {
  		super.uninstallDefaults();
  
  		selectionBackground = null;
  		selectionForeground = null;
  		selectionInactiveBackground = null;
  		selectionInactiveForeground = null;
  	}
  
  	@Override
  	protected FocusListener createFocusListener() {
  		return new BasicListUI.FocusHandler() {
  			@Override
  			public void focusGained( FocusEvent e ) {
  				super.focusGained( e );
  				toggleSelectionColors();
  			}
  
  			@Override
  			public void focusLost( FocusEvent e ) {
  				super.focusLost( e );
  
  				// use invokeLater for the case that the window is deactivated
  				EventQueue.invokeLater( () -> {
  					toggleSelectionColors();
  				} );
  			}
  		};
  	}
  
  	/**
  	 * Toggle selection colors from focused to inactive and vice versa.
  	 *
  	 * This is not a optimal solution but much easier than rewriting the whole paint methods.
  	 *
  	 * Using a LaF specific renderer was avoided because often a custom renderer is
  	 * already used in applications. Then either the inactive colors are not used,
  	 * or the application has to be changed to extend a FlatLaf renderer.
  	 */
  	private void toggleSelectionColors() {
  		if( FlatUIUtils.isPermanentFocusOwner( list ) ) {
  			if( list.getSelectionBackground() == selectionInactiveBackground )
  				list.setSelectionBackground( selectionBackground );
  			if( list.getSelectionForeground() == selectionInactiveForeground )
  				list.setSelectionForeground( selectionForeground );
  		} else {
  			if( list.getSelectionBackground() == selectionBackground )
  				list.setSelectionBackground( selectionInactiveBackground );
  			if( list.getSelectionForeground() == selectionForeground )
  				list.setSelectionForeground( selectionInactiveForeground );
  		}
  	}
  }
  