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.Dimension;
  import java.awt.FontMetrics;
  import java.awt.Graphics;
  import java.awt.Graphics2D;
  import java.awt.Insets;
  import java.beans.PropertyChangeListener;
  import java.util.List;
  import javax.swing.JComponent;
  import javax.swing.JToolTip;
  import javax.swing.SwingUtilities;
  import javax.swing.plaf.ComponentUI;
  import javax.swing.plaf.basic.BasicHTML;
  import javax.swing.plaf.basic.BasicToolTipUI;
  import themeengine.include.com.formdev.flatlaf.util.HiDPIUtils;
  import themeengine.include.com.formdev.flatlaf.util.StringUtils;
  
  /**
   * Provides the Flat LaF UI delegate for {@link javax.swing.JToolTip}.
   *
   * <!-- BasicToolTipUI -->
   *
   * @uiDefault ToolTip.font						Font
   * @uiDefault ToolTip.background				Color
   * @uiDefault ToolTip.foreground				Color
   * @uiDefault ToolTip.backgroundInactive		Color
   * @uiDefault ToolTip.foregroundInactive		Color
   * @uiDefault ToolTip.border					Border
   * @uiDefault ToolTip.borderInactive			Border
   *
   * @author Karl Tauber
   */
  public class FlatToolTipUI
  	extends BasicToolTipUI
  {
  	private static PropertyChangeListener sharedPropertyChangedListener;
  
  	private static ComponentUI instance;
  
  	public static ComponentUI createUI( JComponent c ) {
  		if( instance == null )
  			instance = new FlatToolTipUI();
  		return instance;
  	}
  
  	@Override
  	public void installUI( JComponent c ) {
  		super.installUI( c );
  
  		// update HTML renderer if necessary
  		FlatLabelUI.updateHTMLRenderer( c, ((JToolTip)c).getTipText(), false );
  	}
  
  	@Override
  	protected void installListeners( JComponent c ) {
  		super.installListeners( c );
  
  		if( sharedPropertyChangedListener == null ) {
  			sharedPropertyChangedListener = e -> {
  				String name = e.getPropertyName();
  				if( name == "text" || name == "font" || name == "foreground" ) {
  					JToolTip toolTip = (JToolTip) e.getSource();
  					FlatLabelUI.updateHTMLRenderer( toolTip, toolTip.getTipText(), false );
  				}
  			};
  		}
  
  		c.addPropertyChangeListener( sharedPropertyChangedListener );
  	}
  
  	@Override
  	protected void uninstallListeners( JComponent c ) {
  		super.uninstallListeners( c );
  
  		c.removePropertyChangeListener( sharedPropertyChangedListener );
  	}
  
  	@Override
  	public Dimension getPreferredSize( JComponent c ) {
  		// do not show tool tip if text is empty
  		String text = ((JToolTip)c).getTipText();
  		if( text == null || text.isEmpty() )
  			return new Dimension();
  
  		if( isMultiLine( c ) ) {
  			FontMetrics fm = c.getFontMetrics( c.getFont() );
  			Insets insets = c.getInsets();
  
  			List<String> lines = StringUtils.split( ((JToolTip)c).getTipText(), '\n' );
  			int width = 0;
  			int height = fm.getHeight() * Math.max( lines.size(), 1 );
  			for( String line : lines )
  				width = Math.max( width, SwingUtilities.computeStringWidth( fm, line ) );
  
  			return new Dimension( insets.left + width + insets.right + 6, insets.top + height + insets.bottom );
  		} else
  			return super.getPreferredSize( c );
  	}
  
  	@Override
  	public void paint( Graphics g, JComponent c ) {
  		if( isMultiLine( c ) ) {
  			FontMetrics fm = c.getFontMetrics( c.getFont() );
  			Insets insets = c.getInsets();
  
  			FlatUIUtils.setRenderingHints( (Graphics2D) g );
  			g.setColor( c.getForeground() );
  
  			List<String> lines = StringUtils.split( ((JToolTip)c).getTipText(), '\n' );
  
  			int x = insets.left + 3;
  			int x2 = c.getWidth() - insets.right - 3;
  			int y = insets.top - fm.getDescent();
  			int lineHeight = fm.getHeight();
  			JComponent comp = ((JToolTip)c).getComponent();
  			boolean leftToRight = (comp != null ? comp : c).getComponentOrientation().isLeftToRight();
  			for( String line : lines ) {
  				y += lineHeight;
  				FlatUIUtils.drawString( c, g, line, leftToRight ? x : x2 - SwingUtilities.computeStringWidth( fm, line ), y );
  			}
  		} else
  			super.paint( HiDPIUtils.createGraphicsTextYCorrection( (Graphics2D) g ), c );
  	}
  
  	private boolean isMultiLine( JComponent c ) {
  		String text = ((JToolTip)c).getTipText();
  		return c.getClientProperty( BasicHTML.propertyKey ) == null && text != null && text.indexOf( '\n' ) >= 0;
  	}
  }
  