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.EventQueue;
  import java.awt.event.FocusEvent;
  import java.awt.event.FocusListener;
  import javax.swing.JCheckBox;
  import javax.swing.JComponent;
  import javax.swing.LookAndFeel;
  import javax.swing.UIManager;
  import javax.swing.plaf.ComponentUI;
  import javax.swing.plaf.basic.BasicTableUI;
  import javax.swing.table.TableCellRenderer;
  import themeengine.include.com.formdev.flatlaf.util.UIScale;
  
  /**
   * Provides the Flat LaF UI delegate for {@link javax.swing.JTable}.
   *
   * <!-- BasicTableUI -->
   *
   * @uiDefault Table.font								Font
   * @uiDefault Table.background							Color
   * @uiDefault Table.foreground							Color
   * @uiDefault Table.selectionBackground					Color
   * @uiDefault Table.selectionForeground					Color
   * @uiDefault Table.gridColor							Color
   * @uiDefault Table.scrollPaneBorder					Border
   * @uiDefault Table.dropLineColor						Color
   * @uiDefault Table.dropLineShortColor					Color
   *
   * <!-- DefaultTableCellRenderer -->
   *
   * @uiDefault Table.cellNoFocusBorder					Border
   * @uiDefault Table.focusCellHighlightBorder			Border
   * @uiDefault Table.focusSelectedCellHighlightBorder	Border
   * @uiDefault Table.dropCellBackground					Color
   * @uiDefault Table.dropCellForeground					Color
   * @uiDefault Table.alternateRowColor					Color
   * @uiDefault Table.focusCellBackground					Color
   * @uiDefault Table.focusCellForeground					Color
   *
   * <!-- FlatTableUI -->
   *
   * @uiDefault Table.rowHeight							int
   * @uiDefault Table.showHorizontalLines					boolean
   * @uiDefault Table.showVerticalLines					boolean
   * @uiDefault Table.intercellSpacing					Dimension
   * @uiDefault Table.selectionInactiveBackground			Color
   * @uiDefault Table.selectionInactiveForeground			Color
   *
   * <!-- FlatTableCellBorder -->
   *
   * @uiDefault Table.cellMargins							Insets
   * @uiDefault Table.cellFocusColor						Color
   * @uiDefault Table.showCellFocusIndicator				boolean
   *
   * <!-- FlatInputMaps -->
   *
   * @uiDefault Table.consistentHomeEndKeyBehavior		boolean
   *
   * @author Karl Tauber
   */
  public class FlatTableUI
  	extends BasicTableUI
  {
  	protected boolean showHorizontalLines;
  	protected boolean showVerticalLines;
  	protected Dimension intercellSpacing;
  
  	protected Color selectionBackground;
  	protected Color selectionForeground;
  	protected Color selectionInactiveBackground;
  	protected Color selectionInactiveForeground;
  
  	private boolean oldShowHorizontalLines;
  	private boolean oldShowVerticalLines;
  	private Dimension oldIntercellSpacing;
  
  	public static ComponentUI createUI( JComponent c ) {
  		return new FlatTableUI();
  	}
  
  	@Override
  	protected void installDefaults() {
  		super.installDefaults();
  
  		showHorizontalLines = UIManager.getBoolean( "Table.showHorizontalLines" );
  		showVerticalLines = UIManager.getBoolean( "Table.showVerticalLines" );
  		intercellSpacing = UIManager.getDimension( "Table.intercellSpacing" );
  
  		selectionBackground = UIManager.getColor( "Table.selectionBackground" );
  		selectionForeground = UIManager.getColor( "Table.selectionForeground" );
  		selectionInactiveBackground = UIManager.getColor( "Table.selectionInactiveBackground" );
  		selectionInactiveForeground = UIManager.getColor( "Table.selectionInactiveForeground" );
  
  		toggleSelectionColors();
  
  		int rowHeight = FlatUIUtils.getUIInt( "Table.rowHeight", 16 );
  		if( rowHeight > 0 )
  			LookAndFeel.installProperty( table, "rowHeight", UIScale.scale( rowHeight ) );
  
  		if( !showHorizontalLines ) {
  			oldShowHorizontalLines = table.getShowHorizontalLines();
  			table.setShowHorizontalLines( false );
  		}
  		if( !showVerticalLines ) {
  			oldShowVerticalLines = table.getShowVerticalLines();
  			table.setShowVerticalLines( false );
  		}
  
  		if( intercellSpacing != null ) {
  			oldIntercellSpacing = table.getIntercellSpacing();
  			table.setIntercellSpacing( intercellSpacing );
  		}
  
  		// checkbox is non-opaque in FlatLaf and therefore would not paint selection
  		// --> make checkbox renderer opaque (but opaque in Metal or Windows LaF)
  		TableCellRenderer booleanRenderer = table.getDefaultRenderer( Boolean.class );
  		if( booleanRenderer instanceof JCheckBox )
  			((JCheckBox)booleanRenderer).setOpaque( true );
  	}
  
  	@Override
  	protected void uninstallDefaults() {
  		super.uninstallDefaults();
  
  		selectionBackground = null;
  		selectionForeground = null;
  		selectionInactiveBackground = null;
  		selectionInactiveForeground = null;
  
  		// restore old show horizontal/vertical lines (if not modified)
  		if( !showHorizontalLines && oldShowHorizontalLines && !table.getShowHorizontalLines() )
  			table.setShowHorizontalLines( true );
  		if( !showVerticalLines && oldShowVerticalLines && !table.getShowVerticalLines() )
  			table.setShowVerticalLines( true );
  
  		// restore old intercell spacing (if not modified)
  		if( intercellSpacing != null && table.getIntercellSpacing().equals( intercellSpacing ) )
  			table.setIntercellSpacing( oldIntercellSpacing );
  	}
  
  	@Override
  	protected FocusListener createFocusListener() {
  		return new BasicTableUI.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( table ) ) {
  			if( table.getSelectionBackground() == selectionInactiveBackground )
  				table.setSelectionBackground( selectionBackground );
  			if( table.getSelectionForeground() == selectionInactiveForeground )
  				table.setSelectionForeground( selectionForeground );
  		} else {
  			if( table.getSelectionBackground() == selectionBackground )
  				table.setSelectionBackground( selectionInactiveBackground );
  			if( table.getSelectionForeground() == selectionForeground )
  				table.setSelectionForeground( selectionInactiveForeground );
  		}
  	}
  }
  