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.Container;
  import java.awt.Dimension;
  import java.awt.FontMetrics;
  import java.awt.Graphics;
  import java.awt.Graphics2D;
  import java.awt.Insets;
  import java.awt.event.FocusListener;
  import java.beans.PropertyChangeEvent;
  import javax.swing.JComboBox;
  import javax.swing.JComponent;
  import javax.swing.JSpinner;
  import javax.swing.JTextField;
  import javax.swing.LookAndFeel;
  import javax.swing.UIManager;
  import javax.swing.plaf.ComponentUI;
  import javax.swing.plaf.UIResource;
  import javax.swing.plaf.basic.BasicTextFieldUI;
  import javax.swing.text.Caret;
  import javax.swing.text.JTextComponent;
  import themeengine.include.com.formdev.flatlaf.FlatClientProperties;
  import themeengine.include.com.formdev.flatlaf.util.HiDPIUtils;
  
  /**
   * Provides the Flat LaF UI delegate for {@link javax.swing.JTextField}.
   *
   * <!-- BasicTextFieldUI -->
   *
   * @uiDefault TextField.font					Font
   * @uiDefault TextField.background				Color
   * @uiDefault TextField.foreground				Color	also used if not editable
   * @uiDefault TextField.caretForeground			Color
   * @uiDefault TextField.selectionBackground		Color
   * @uiDefault TextField.selectionForeground		Color
   * @uiDefault TextField.disabledBackground		Color	used if not enabled
   * @uiDefault TextField.inactiveBackground		Color	used if not editable
   * @uiDefault TextField.inactiveForeground		Color	used if not enabled (yes, this is confusing; this should be named disabledForeground)
   * @uiDefault TextField.border					Border
   * @uiDefault TextField.margin					Insets
   * @uiDefault TextField.caretBlinkRate			int		default is 500 milliseconds
   *
   * <!-- FlatTextFieldUI -->
   *
   * @uiDefault Component.minimumWidth			int
   * @uiDefault Component.isIntelliJTheme			boolean
   * @uiDefault TextField.placeholderForeground	Color
   * @uiDefault TextComponent.selectAllOnFocusPolicy	String	never, once (default) or always
   *
   * @author Karl Tauber
   */
  public class FlatTextFieldUI
  	extends BasicTextFieldUI
  {
  	protected int minimumWidth;
  	protected boolean isIntelliJTheme;
  	protected Color placeholderForeground;
  
  	private FocusListener focusListener;
  
  	public static ComponentUI createUI( JComponent c ) {
  		return new FlatTextFieldUI();
  	}
  
  	@Override
  	protected void installDefaults() {
  		super.installDefaults();
  
  		String prefix = getPropertyPrefix();
  		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
  		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
  		placeholderForeground = UIManager.getColor( prefix + ".placeholderForeground" );
  
  		LookAndFeel.installProperty( getComponent(), "opaque", false );
  
  		MigLayoutVisualPadding.install( getComponent() );
  	}
  
  	@Override
  	protected void uninstallDefaults() {
  		super.uninstallDefaults();
  
  		placeholderForeground = null;
  
  		MigLayoutVisualPadding.uninstall( getComponent() );
  	}
  
  	@Override
  	protected void installListeners() {
  		super.installListeners();
  
  		focusListener = new FlatUIUtils.RepaintFocusListener( getComponent() );
  		getComponent().addFocusListener( focusListener );
  	}
  
  	@Override
  	protected void uninstallListeners() {
  		super.uninstallListeners();
  
  		getComponent().removeFocusListener( focusListener );
  		focusListener = null;
  	}
  
  	@Override
  	protected Caret createCaret() {
  		return new FlatCaret( UIManager.getString( "TextComponent.selectAllOnFocusPolicy" ) );
  	}
  
  	@Override
  	protected void propertyChange( PropertyChangeEvent e ) {
  		super.propertyChange( e );
  		propertyChange( getComponent(), e );
  	}
  
  	static void propertyChange( JTextComponent c, PropertyChangeEvent e ) {
  		switch( e.getPropertyName() ) {
  			case FlatClientProperties.PLACEHOLDER_TEXT:
  			case FlatClientProperties.COMPONENT_ROUND_RECT:
  				c.repaint();
  				break;
  
  			case FlatClientProperties.MINIMUM_WIDTH:
  				c.revalidate();
  				break;
  		}
  	}
  
  	@Override
  	protected void paintSafely( Graphics g ) {
  		paintBackground( g, getComponent(), isIntelliJTheme );
  		paintPlaceholder( g, getComponent(), placeholderForeground );
  
  		super.paintSafely( HiDPIUtils.createGraphicsTextYCorrection( (Graphics2D) g ) );
  	}
  
  	@Override
  	protected void paintBackground( Graphics g ) {
  		// background is painted elsewhere
  	}
  
  	static void paintBackground( Graphics g, JTextComponent c, boolean isIntelliJTheme ) {
  		// do not paint background if:
  		//   - not opaque and
  		//   - border is not a flat border and
  		//   - opaque was explicitly set (to false)
  		// (same behaviour as in AquaTextFieldUI)
  		if( !c.isOpaque() && FlatUIUtils.getOutsideFlatBorder( c ) == null && FlatUIUtils.hasOpaqueBeenExplicitlySet( c ) )
  			return;
  
  		float focusWidth = FlatUIUtils.getBorderFocusWidth( c );
  		float arc = FlatUIUtils.getBorderArc( c );
  
  		// fill background if opaque to avoid garbage if user sets opaque to true
  		if( c.isOpaque() && (focusWidth > 0 || arc > 0) )
  			FlatUIUtils.paintParentBackground( g, c );
  
  		// paint background
  		Graphics2D g2 = (Graphics2D) g.create();
  		try {
  			FlatUIUtils.setRenderingHints( g2 );
  
  			Color background = c.getBackground();
  			g2.setColor( !(background instanceof UIResource)
  				? background
  				: (isIntelliJTheme && (!c.isEnabled() || !c.isEditable())
  					? FlatUIUtils.getParentBackground( c )
  					: background) );
  			FlatUIUtils.paintComponentBackground( g2, 0, 0, c.getWidth(), c.getHeight(), focusWidth, arc );
  		} finally {
  			g2.dispose();
  		}
  	}
  
  	static void paintPlaceholder( Graphics g, JTextComponent c, Color placeholderForeground ) {
  		// check whether text component is empty
  		if( c.getDocument().getLength() > 0 )
  			return;
  
  		// check for JComboBox
  		Container parent = c.getParent();
  		JComponent jc = (parent instanceof JComboBox) ? (JComboBox<?>) parent : c;
  
  		// get placeholder text
  		Object placeholder = jc.getClientProperty( FlatClientProperties.PLACEHOLDER_TEXT );
  		if( !(placeholder instanceof String) )
  			return;
  
  		// compute placeholder location
  		Insets insets = c.getInsets();
  		FontMetrics fm = c.getFontMetrics( c.getFont() );
  		int x = insets.left;
  		int y = insets.top + fm.getAscent() + ((c.getHeight() - insets.top - insets.bottom - fm.getHeight()) / 2);
  
  		// paint placeholder
  		g.setColor( placeholderForeground );
  		FlatUIUtils.drawString( c, g, (String) placeholder, x, y );
  	}
  
  	@Override
  	public Dimension getPreferredSize( JComponent c ) {
  		return applyMinimumWidth( c, super.getPreferredSize( c ), minimumWidth );
  	}
  
  	@Override
  	public Dimension getMinimumSize( JComponent c ) {
  		return applyMinimumWidth( c, super.getMinimumSize( c ), minimumWidth );
  	}
  
  	static Dimension applyMinimumWidth( JComponent c, Dimension size, int minimumWidth ) {
  		// do not apply minimum width if JTextField.columns is set
  		if( c instanceof JTextField && ((JTextField)c).getColumns() > 0 )
  			return size;
  
  		// do not apply minimum width if used in combobox or spinner
  		Container parent = c.getParent();
  		if( parent instanceof JComboBox ||
  			parent instanceof JSpinner ||
  			(parent != null && parent.getParent() instanceof JSpinner) )
  		  return size;
  
  		minimumWidth = FlatUIUtils.minimumWidth( c, minimumWidth );
  		float focusWidth = FlatUIUtils.getBorderFocusWidth( c );
  		size.width = Math.max( size.width, scale( minimumWidth ) + Math.round( focusWidth * 2 ) );
  		return size;
  	}
  }
  