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flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatHTML.java
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| /* | ||
| * Copyright 2024 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 | ||
| * | ||
| * https://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 com.formdev.flatlaf.ui; | ||
|
|
||
| import java.awt.Color; | ||
| import java.beans.PropertyChangeEvent; | ||
| import java.beans.PropertyChangeListener; | ||
| import javax.swing.JComponent; | ||
| import javax.swing.plaf.basic.BasicHTML; | ||
| import javax.swing.text.Document; | ||
| import javax.swing.text.LabelView; | ||
| import javax.swing.text.Style; | ||
| import javax.swing.text.StyleConstants; | ||
| import javax.swing.text.View; | ||
| import javax.swing.text.html.HTMLDocument; | ||
| import javax.swing.text.html.StyleSheet; | ||
|
|
||
| /** | ||
| * @author Karl Tauber | ||
| * @since 3.5 | ||
| */ | ||
| public class FlatHTML | ||
| { | ||
| private FlatHTML() {} | ||
|
|
||
| /** | ||
| * Adds CSS rule BASE_SIZE to the style sheet of the HTML view, | ||
| * which re-calculates font sizes based on current component font size. | ||
| * This is necessary for "absolute-size" keywords (e.g. "x-large") | ||
| * for "font-size" attributes in default style sheet (see javax/swing/text/html/default.css). | ||
| * See also <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/font-size?retiredLocale=de#values">CSS font-size</a>. | ||
| * <p> | ||
| * This method should be invoked after {@link BasicHTML#updateRenderer(JComponent, String)}. | ||
| */ | ||
| public static void updateRendererCSSFontBaseSize( JComponent c ) { | ||
| View view = (View) c.getClientProperty( BasicHTML.propertyKey ); | ||
| if( view == null ) | ||
| return; | ||
|
|
||
| // dumpViews( view, 0 ); | ||
|
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| Document doc = view.getDocument(); | ||
| if( !(doc instanceof HTMLDocument) ) | ||
| return; | ||
|
|
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| // add BASE_SIZE rule if necessary | ||
| // - if point size at index 7 is not 36, then probably HTML text contains BASE_SIZE rule | ||
| // - if point size at index 4 is equal to given font size, then it is not necessary to add BASE_SIZE rule | ||
| StyleSheet styleSheet = ((HTMLDocument)doc).getStyleSheet(); | ||
| int fontBaseSize = c.getFont().getSize(); | ||
| if( styleSheet.getPointSize( 7 ) != 36f || | ||
| styleSheet.getPointSize( 4 ) == fontBaseSize ) | ||
| return; | ||
|
|
||
| // BASE_SIZE rule is parsed in javax.swing.text.html.StyleSheet.addRule() | ||
| styleSheet.addRule( "BASE_SIZE " + fontBaseSize ); | ||
| clearViewCaches( view ); | ||
|
|
||
| // dumpViews( view, 0 ); | ||
| } | ||
|
|
||
| /** | ||
| * Updates foreground in style sheet of the HTML view. | ||
| * Adds "body { color: #<foreground-hex>; }" | ||
| */ | ||
| public static void updateRendererCSSForeground( View view, Color foreground ) { | ||
| Document doc = view.getDocument(); | ||
| if( !(doc instanceof HTMLDocument) || foreground == null ) | ||
| return; | ||
|
|
||
| // add foreground rule if necessary | ||
| // - use tag 'body' because BasicHTML.createHTMLView() also uses this tag | ||
| // to set font and color styles to component font/color | ||
| // see: SwingUtilities2.displayPropertiesToCSS() | ||
| // - this color is not used if component is disabled; | ||
| // JTextComponent.getDisabledTextColor() is used for disabled text components; | ||
| // UIManager.getColor("textInactiveText") is used for other disabled components | ||
| // see: javax.swing.text.GlyphView.paint() | ||
| Style bodyStyle = ((HTMLDocument)doc).getStyle( "body" ); | ||
| if( bodyStyle == null ) { | ||
| StyleSheet styleSheet = ((HTMLDocument)doc).getStyleSheet(); | ||
| styleSheet.addRule( String.format( "body { color: #%06x; }", foreground.getRGB() & 0xffffff ) ); | ||
| clearViewCaches( view ); | ||
| } else if( !foreground.equals( bodyStyle.getAttribute( StyleConstants.Foreground ) ) ) { | ||
| bodyStyle.addAttribute( StyleConstants.Foreground, foreground ); | ||
| clearViewCaches( view ); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Clears cached values in view so that CSS changes take effect. | ||
| */ | ||
| private static void clearViewCaches( View view ) { | ||
| if( view instanceof LabelView ) | ||
| ((LabelView)view).changedUpdate( null, null, null ); | ||
|
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||
| int viewCount = view.getViewCount(); | ||
| for( int i = 0; i < viewCount; i++ ) | ||
| clearViewCaches( view.getView( i ) ); | ||
| } | ||
|
|
||
| public static PropertyChangeListener createPropertyChangeListener( PropertyChangeListener superListener ) { | ||
| return e -> { | ||
| if( superListener != null ) | ||
| superListener.propertyChange( e ); | ||
| propertyChange( e ); | ||
| }; | ||
| } | ||
|
|
||
| /** | ||
| * Invokes {@link #updateRendererCSSFontBaseSize(JComponent)} | ||
| * for {@link BasicHTML#propertyKey} property change events, | ||
| * which are fired when {@link BasicHTML#updateRenderer(JComponent, String)} | ||
| * updates the HTML view. | ||
| */ | ||
| public static void propertyChange( PropertyChangeEvent e ) { | ||
| if( BasicHTML.propertyKey.equals( e.getPropertyName() ) ) | ||
| FlatHTML.updateRendererCSSFontBaseSize( (JComponent) e.getSource() ); | ||
| } | ||
|
|
||
| /*debug | ||
| public static void dumpView( JComponent c ) { | ||
| View view = (View) c.getClientProperty( BasicHTML.propertyKey ); | ||
| if( view != null ) | ||
| dumpViews( view, 0 ); | ||
| } | ||
| public static void dumpViews( View view, int indent ) { | ||
| for( int i = 0; i < indent; i++ ) | ||
| System.out.print( " " ); | ||
| System.out.print( view.getClass().isAnonymousClass() ? view.getClass().getName() : view.getClass().getSimpleName() ); | ||
| if( view instanceof LabelView ) { | ||
| LabelView lview = ((LabelView)view); | ||
| Font font = lview.getFont(); | ||
| Color foreground = lview.getForeground(); | ||
| System.out.printf( " %2d-%-2d %-14s %d #%06x", | ||
| lview.getStartOffset(), lview.getEndOffset() - 1, | ||
| font.getName(), font.getSize(), | ||
| foreground.getRGB() & 0xffffff ); | ||
| } | ||
| System.out.println(); | ||
| int viewCount = view.getViewCount(); | ||
| for( int i = 0; i < viewCount; i++ ) { | ||
| View child = view.getView( i ); | ||
| dumpViews( child, indent + 1 ); | ||
| } | ||
| } | ||
| debug*/ | ||
| } |
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