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 static themeengine.include.com.formdev.flatlaf.util.UIScale.scale;
  import java.awt.Color;
  import java.awt.Dimension;
  import java.awt.Graphics;
  import java.awt.Insets;
  import java.awt.Rectangle;
  import javax.swing.AbstractButton;
  import javax.swing.JComponent;
  import javax.swing.LookAndFeel;
  import javax.swing.UIManager;
  import javax.swing.plaf.ComponentUI;
  import javax.swing.plaf.UIResource;
  import javax.swing.plaf.basic.BasicRadioButtonUI;
  import themeengine.include.com.formdev.flatlaf.icons.FlatCheckBoxIcon;
  import themeengine.include.com.formdev.flatlaf.util.UIScale;
  
  /**
   * Provides the Flat LaF UI delegate for {@link javax.swing.JRadioButton}.
   *
   * <!-- BasicRadioButtonUI -->
   *
   * @uiDefault RadioButton.font						Font
   * @uiDefault RadioButton.background				Color
   * @uiDefault RadioButton.foreground				Color
   * @uiDefault RadioButton.border					Border
   * @uiDefault RadioButton.margin					Insets
   * @uiDefault RadioButton.rollover					boolean
   * @uiDefault RadioButton.icon						Icon
   *
   * <!-- FlatRadioButtonUI -->
   *
   * @uiDefault RadioButton.iconTextGap				int
   * @uiDefault RadioButton.disabledText				Color
   *
   * @author Karl Tauber
   */
  public class FlatRadioButtonUI
  	extends BasicRadioButtonUI
  {
  	protected int iconTextGap;
  	protected Color disabledText;
  
  	private boolean defaults_initialized = false;
  
  	private static ComponentUI instance;
  
  	public static ComponentUI createUI( JComponent c ) {
  		if( instance == null )
  			instance = new FlatRadioButtonUI();
  		return instance;
  	}
  
  	@Override
  	public void installDefaults( AbstractButton b ) {
  		super.installDefaults( b );
  
  		if( !defaults_initialized ) {
  			String prefix = getPropertyPrefix();
  
  			iconTextGap = FlatUIUtils.getUIInt( prefix + "iconTextGap", 4 );
  			disabledText = UIManager.getColor( prefix + "disabledText" );
  
  			defaults_initialized = true;
  		}
  
  		LookAndFeel.installProperty( b, "opaque", false );
  		LookAndFeel.installProperty( b, "iconTextGap", scale( iconTextGap ) );
  
  		MigLayoutVisualPadding.install( b, null );
  	}
  
  	@Override
  	protected void uninstallDefaults( AbstractButton b ) {
  		super.uninstallDefaults( b );
  
  		MigLayoutVisualPadding.uninstall( b );
  		defaults_initialized = false;
  	}
  
  	private static Insets tempInsets = new Insets( 0, 0, 0, 0 );
  
  	@Override
  	public Dimension getPreferredSize( JComponent c ) {
  		Dimension size = super.getPreferredSize( c );
  		if( size == null )
  			return null;
  
  		// small insets fix
  		int focusWidth = getIconFocusWidth( c );
  		if( focusWidth > 0 ) {
  			// Increase preferred width and height if insets were explicitly reduced (e.g. with
  			// an EmptyBorder) and icon has a focus width, which is not included in icon size.
  			// Otherwise the component may be too small and outer focus border may be cut off.
  			Insets insets = c.getInsets( tempInsets );
  			size.width += Math.max( focusWidth - insets.left, 0 ) + Math.max( focusWidth - insets.right, 0 );
  			size.height += Math.max( focusWidth - insets.top, 0 ) + Math.max( focusWidth - insets.bottom, 0 );
  		}
  
  		return size;
  	}
  
  	@Override
  	public void paint( Graphics g, JComponent c ) {
  		// fill background even if not opaque if
  		// - contentAreaFilled is true and
  		// - if background was explicitly set to a non-UIResource color
  		if( !c.isOpaque() &&
  			((AbstractButton)c).isContentAreaFilled() &&
  			!(c.getBackground() instanceof UIResource) )
  		{
  			g.setColor( c.getBackground() );
  			g.fillRect( 0, 0, c.getWidth(), c.getHeight() );
  		}
  
  		// small insets fix
  		int focusWidth = getIconFocusWidth( c );
  		if( focusWidth > 0 ) {
  			boolean ltr = c.getComponentOrientation().isLeftToRight();
  			Insets insets = c.getInsets( tempInsets );
  			int leftOrRightInset = ltr ? insets.left : insets.right;
  			if( focusWidth > leftOrRightInset ) {
  				// The left (or right) inset is smaller than the focus width, which may be
  				// the case if insets were explicitly reduced (e.g. with an EmptyBorder).
  				// In this case the width has been increased in getPreferredSize() and
  				// here it is necessary to fix icon and text painting location.
  				int offset = focusWidth - leftOrRightInset;
  				if( !ltr )
  					offset = -offset;
  
  				// move the graphics origin to the left (or right)
  				g.translate( offset, 0 );
  				super.paint( g, c );
  				g.translate( -offset, 0 );
  				return;
  			}
  		}
  
  		super.paint( FlatLabelUI.createGraphicsHTMLTextYCorrection( g, c ), c );
  	}
  
  	@Override
  	protected void paintText( Graphics g, AbstractButton b, Rectangle textRect, String text ) {
  		FlatButtonUI.paintText( g, b, textRect, text, b.isEnabled() ? b.getForeground() : disabledText );
  	}
  
  	private int getIconFocusWidth( JComponent c ) {
  		AbstractButton b = (AbstractButton) c;
  		return (b.getIcon() == null && getDefaultIcon() instanceof FlatCheckBoxIcon)
  			? UIScale.scale( ((FlatCheckBoxIcon)getDefaultIcon()).focusWidth )
  			: 0;
  	}
  }
  