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.Dimension;
  import java.awt.Font;
  import java.awt.Graphics;
  import java.awt.event.MouseEvent;
  import javax.swing.ButtonModel;
  import javax.swing.Icon;
  import javax.swing.JComponent;
  import javax.swing.JMenu;
  import javax.swing.JMenuItem;
  import javax.swing.LookAndFeel;
  import javax.swing.UIManager;
  import javax.swing.event.MouseInputListener;
  import javax.swing.plaf.ComponentUI;
  import javax.swing.plaf.basic.BasicMenuUI;
  
  /**
   * Provides the Flat LaF UI delegate for {@link javax.swing.JMenu}.
   *
   * <!-- BasicMenuUI -->
   *
   * @uiDefault Menu.font												Font
   * @uiDefault Menu.background										Color
   * @uiDefault Menu.foreground										Color
   * @uiDefault Menu.disabledForeground								Color
   * @uiDefault Menu.selectionBackground								Color
   * @uiDefault Menu.selectionForeground								Color
   * @uiDefault Menu.acceleratorForeground							Color
   * @uiDefault Menu.acceleratorSelectionForeground					Color
   * @uiDefault MenuItem.acceleratorFont								Font		defaults to MenuItem.font
   * @uiDefault MenuItem.acceleratorDelimiter							String
   * @uiDefault Menu.border											Border
   * @uiDefault Menu.borderPainted									boolean
   * @uiDefault Menu.margin											Insets
   * @uiDefault Menu.arrowIcon										Icon
   * @uiDefault Menu.checkIcon										Icon
   * @uiDefault Menu.opaque											boolean
   * @uiDefault Menu.crossMenuMnemonic								boolean	default is false
   * @uiDefault Menu.useMenuBarBackgroundForTopLevel					boolean	default is false
   * @uiDefault MenuBar.background									Color	used if Menu.useMenuBarBackgroundForTopLevel is true
   *
   * <!-- FlatMenuUI -->
   *
   * @uiDefault MenuItem.iconTextGap									int
   * @uiDefault MenuBar.hoverBackground								Color
   *
   * @author Karl Tauber
   */
  public class FlatMenuUI
  	extends BasicMenuUI
  {
  	private Color hoverBackground;
  	private FlatMenuItemRenderer renderer;
  
  	public static ComponentUI createUI( JComponent c ) {
  		return new FlatMenuUI();
  	}
  
  	@Override
  	protected void installDefaults() {
  		super.installDefaults();
  
  		LookAndFeel.installProperty( menuItem, "iconTextGap", FlatUIUtils.getUIInt( "MenuItem.iconTextGap", 4 ) );
  
  		menuItem.setRolloverEnabled( true );
  
  		hoverBackground = UIManager.getColor( "MenuBar.hoverBackground" );
  		renderer = createRenderer();
  	}
  
  	@Override
  	protected void uninstallDefaults() {
  		super.uninstallDefaults();
  
  		hoverBackground = null;
  		renderer = null;
  	}
  
  	protected FlatMenuItemRenderer createRenderer() {
  		return new FlatMenuRenderer( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
  	}
  
  	@Override
  	protected MouseInputListener createMouseInputListener( JComponent c ) {
  		return new BasicMenuUI.MouseInputHandler() {
  			@Override
  			public void mouseEntered( MouseEvent e ) {
  				super.mouseEntered( e );
  				rollover( e, true );
  			}
  
  			@Override
  			public void mouseExited( MouseEvent e ) {
  				super.mouseExited( e );
  				rollover( e, false );
  			}
  
  			private void rollover( MouseEvent e, boolean rollover ) {
  				JMenu menu = (JMenu) e.getSource();
  				if( menu.isTopLevelMenu() && menu.isRolloverEnabled() ) {
  					menu.getModel().setRollover( rollover );
  					menu.repaint();
  				}
  			}
  		};
  	}
  
  	@Override
  	public Dimension getMinimumSize( JComponent c ) {
  		// avoid that top-level menus (in menu bar) are made smaller if horizontal space is rare
  		// same code is in BasicMenuUI since Java 10
  		// see https://bugs.openjdk.java.net/browse/JDK-8178430
  		return ((JMenu)menuItem).isTopLevelMenu() ? c.getPreferredSize() : null;
  	}
  
  	@Override
  	protected Dimension getPreferredMenuItemSize( JComponent c, Icon checkIcon, Icon arrowIcon, int defaultTextIconGap ) {
  		return renderer.getPreferredMenuItemSize();
  	}
  
  	@Override
  	public void paint( Graphics g, JComponent c ) {
  		renderer.paintMenuItem( g, selectionBackground, selectionForeground, disabledForeground,
  			acceleratorForeground, acceleratorSelectionForeground );
  	}
  
  	//---- class FlatMenuRenderer ---------------------------------------------
  
  	protected class FlatMenuRenderer
  		extends FlatMenuItemRenderer
  	{
  		protected FlatMenuRenderer( JMenuItem menuItem, Icon checkIcon, Icon arrowIcon,
  			Font acceleratorFont, String acceleratorDelimiter )
  		{
  			super( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
  		}
  
  		@Override
  		protected void paintBackground( Graphics g, Color selectionBackground ) {
  			ButtonModel model = menuItem.getModel();
  			if( model.isRollover() && !model.isArmed() && !model.isSelected() &&
  				model.isEnabled() && ((JMenu)menuItem).isTopLevelMenu() )
  			{
  				g.setColor( deriveBackground( hoverBackground ) );
  				g.fillRect( 0, 0, menuItem.getWidth(), menuItem.getHeight() );
  			} else
  				super.paintBackground( g, selectionBackground );
  		}
  	}
  }
  