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.Component;
  import java.awt.Container;
  import java.awt.Dimension;
  import java.awt.Graphics;
  import java.awt.GridBagConstraints;
  import java.awt.Insets;
  import javax.swing.JComponent;
  import javax.swing.JPanel;
  import javax.swing.UIManager;
  import javax.swing.border.Border;
  import javax.swing.plaf.ComponentUI;
  import javax.swing.plaf.UIResource;
  import javax.swing.plaf.basic.BasicHTML;
  import javax.swing.plaf.basic.BasicOptionPaneUI;
  import themeengine.include.com.formdev.flatlaf.util.UIScale;
  
  /**
   * Provides the Flat LaF UI delegate for {@link javax.swing.JOptionPane}.
   *
   * <!-- BasicOptionPaneUI -->
   *
   * @uiDefault OptionPane.font						Font	unused
   * @uiDefault OptionPane.background					Color
   * @uiDefault OptionPane.foreground					Color	unused
   * @uiDefault OptionPane.border						Border
   * @uiDefault OptionPane.messageAreaBorder			Border
   * @uiDefault OptionPane.buttonAreaBorder			Border
   * @uiDefault OptionPane.messageForeground			Color	optional; defaults to Label.foreground
   * @uiDefault OptionPane.messageFont				Font	optional; defaults to Label.font
   * @uiDefault OptionPane.buttonFont					Font	optional; defaults to Button.font
   *
   * @uiDefault OptionPane.minimumSize				Dimension
   * @uiDefault OptionPane.buttonPadding				int
   * @uiDefault OptionPane.buttonMinimumWidth			int		-1=disabled
   * @uiDefault OptionPane.sameSizeButtons			boolean	if true, gives all buttons same size
   * @uiDefault OptionPane.setButtonMargin			boolean	if true, invokes button.setMargin(2,4,2,4)
   * @uiDefault OptionPane.buttonOrientation			int		0=center, 2=left, 4=right
   * @uiDefault OptionPane.isYesLast					boolean	reverse button order if true
   *
   * @uiDefault OptionPane.errorIcon					Icon
   * @uiDefault OptionPane.informationIcon			Icon
   * @uiDefault OptionPane.questionIcon				Icon
   * @uiDefault OptionPane.warningIcon				Icon
   *
   * @uiDefault OptionPane.okButtonText				String
   * @uiDefault OptionPane.okButtonMnemonic			String
   * @uiDefault OptionPane.okIcon						Icon
   * @uiDefault OptionPane.cancelButtonText			String
   * @uiDefault OptionPane.cancelButtonMnemonic		String
   * @uiDefault OptionPane.cancelIcon					Icon
   * @uiDefault OptionPane.yesButtonText				String
   * @uiDefault OptionPane.yesButtonMnemonic			String
   * @uiDefault OptionPane.yesIcon					Icon
   * @uiDefault OptionPane.noButtonText				String
   * @uiDefault OptionPane.noButtonMnemonic			String
   * @uiDefault OptionPane.noIcon						Icon
   *
   * <!-- FlatOptionPaneUI -->
   *
   * @uiDefault OptionPane.iconMessageGap				int
   * @uiDefault OptionPane.messagePadding				int
   * @uiDefault OptionPane.maxCharactersPerLine		int
   *
   * @author Karl Tauber
   */
  public class FlatOptionPaneUI
  	extends BasicOptionPaneUI
  {
  	protected int iconMessageGap;
  	protected int messagePadding;
  	protected int maxCharactersPerLine;
  	private int focusWidth;
  
  	public static ComponentUI createUI( JComponent c ) {
  		return new FlatOptionPaneUI();
  	}
  
  	@Override
  	protected void installDefaults() {
  		super.installDefaults();
  
  		iconMessageGap = UIManager.getInt( "OptionPane.iconMessageGap" );
  		messagePadding = UIManager.getInt( "OptionPane.messagePadding" );
  		maxCharactersPerLine = UIManager.getInt( "OptionPane.maxCharactersPerLine" );
  		focusWidth = UIManager.getInt( "Component.focusWidth" );
  	}
  
  	@Override
  	protected void installComponents() {
  		super.installComponents();
  
  		updateChildPanels( optionPane );
  	}
  
  	@Override
  	public Dimension getMinimumOptionPaneSize() {
  		return UIScale.scale( super.getMinimumOptionPaneSize() );
  	}
  
  	@Override
  	protected int getMaxCharactersPerLineCount() {
  		int max = super.getMaxCharactersPerLineCount();
  		return (maxCharactersPerLine > 0 && max == Integer.MAX_VALUE) ? maxCharactersPerLine : max;
  	}
  
  	@Override
  	protected Container createMessageArea() {
  		Container messageArea = super.createMessageArea();
  
  		// set icon-message gap
  		if( iconMessageGap > 0 ) {
  			Component iconMessageSeparator = findByName( messageArea, "OptionPane.separator" );
  			if( iconMessageSeparator != null )
  				iconMessageSeparator.setPreferredSize( new Dimension( UIScale.scale( iconMessageGap ), 1 ) );
  		}
  
  		return messageArea;
  	}
  
  	@Override
  	protected Container createButtonArea() {
  		Container buttonArea = super.createButtonArea();
  
  		// scale button padding and subtract focusWidth
  		if( buttonArea.getLayout() instanceof ButtonAreaLayout ) {
  			ButtonAreaLayout layout = (ButtonAreaLayout) buttonArea.getLayout();
  			layout.setPadding( UIScale.scale( layout.getPadding() - (focusWidth * 2) ) );
  		}
  
  		return buttonArea;
  	}
  
  	@Override
  	protected void addMessageComponents( Container container, GridBagConstraints cons, Object msg, int maxll,
  		boolean internallyCreated )
  	{
  		// set message padding
  		if( messagePadding > 0 )
  			cons.insets.bottom = UIScale.scale( messagePadding );
  
  		// disable line wrapping for HTML
  		if( msg instanceof String && BasicHTML.isHTMLString( (String) msg ) )
  			maxll = Integer.MAX_VALUE;
  
  		super.addMessageComponents( container, cons, msg, maxll, internallyCreated );
  	}
  
  	private void updateChildPanels( Container c ) {
  		for( Component child : c.getComponents() ) {
  			if( child instanceof JPanel ) {
  				JPanel panel = (JPanel)child;
  
  				// make sub-panel non-opaque for OptionPane.background
  				panel.setOpaque( false );
  
  				// use non-UIResource borders to avoid that they are replaced when switching LaF
  				Border border = panel.getBorder();
  				if( border instanceof UIResource )
  					panel.setBorder( new NonUIResourceBorder( border ) );
  			}
  
  			if( child instanceof Container ) {
  				updateChildPanels( (Container) child );
  			}
  		}
  	}
  
  	private Component findByName( Container c, String name ) {
  		for( Component child : c.getComponents() ) {
  			if( name.equals( child.getName() ) )
  				return child;
  
  			if( child instanceof Container ) {
  				Component c2 = findByName( (Container) child, name );
  				if( c2 != null )
  					return c2;
  			}
  		}
  		return null;
  	}
  
  	//---- class NonUIResourceBorder ------------------------------------------
  
  	private static class NonUIResourceBorder
  		implements Border
  	{
  		private final Border delegate;
  
  		NonUIResourceBorder( Border delegate ) {
  			this.delegate = delegate;
  		}
  
  		@Override
  		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
  			delegate.paintBorder( c, g, x, y, width, height );
  		}
  
  		@Override
  		public Insets getBorderInsets( Component c ) {
  			return delegate.getBorderInsets( c );
  		}
  
  		@Override
  		public boolean isBorderOpaque() {
  			return delegate.isBorderOpaque();
  		}
  	}
  }
  