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Popup: added drop shadows to all popups (menu, combobox and tooltip) …
…on all platforms (issue #94)
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flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPopupFactory.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,168 @@ | ||
| /* | ||
| * Copyright 2020 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; | ||
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|
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| import java.awt.Color; | ||
| import java.awt.Component; | ||
| import java.awt.Container; | ||
| import java.awt.Dimension; | ||
| import java.awt.Window; | ||
| import java.lang.reflect.InvocationTargetException; | ||
| import java.lang.reflect.Method; | ||
| import javax.swing.JComponent; | ||
| import javax.swing.Popup; | ||
| import javax.swing.PopupFactory; | ||
| import javax.swing.SwingUtilities; | ||
| import javax.swing.border.Border; | ||
| import com.formdev.flatlaf.util.SystemInfo; | ||
|
|
||
| /** | ||
| * A popup factory that adds drop shadows to popups on Windows and Linux. | ||
| * On macOS, heavy weight popups (without drop shadow) are produced and the | ||
| * operating system automatically adds drop shadows. | ||
| * | ||
| * @author Karl Tauber | ||
| */ | ||
| public class FlatPopupFactory | ||
| extends PopupFactory | ||
| { | ||
| private Method java8getPopupMethod; | ||
| private Method java9getPopupMethod; | ||
|
|
||
| @Override | ||
| public Popup getPopup( Component owner, Component contents, int x, int y ) | ||
| throws IllegalArgumentException | ||
| { | ||
| // always use heavy weight popup because the drop shadow increases | ||
| // the popup size and may overlap the window bounds | ||
| Popup popup = getHeavyWeightPopup( owner, contents, x, y ); | ||
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| // failed to get heavy weight popup --> do not add drop shadow | ||
| if( popup == null ) | ||
| return super.getPopup( owner, contents, x, y ); | ||
|
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| // macOS adds drop shadow to heavy weight popups | ||
| if( SystemInfo.IS_MAC ) | ||
| return popup; | ||
|
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| // create drop shadow popup | ||
| return new DropShadowPopup( popup, contents ); | ||
| } | ||
|
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||
| /** | ||
| * There is no API in Java 8 to force creation of heavy weight popups, | ||
| * but it is possible with reflection. Java 9 provides a new method. | ||
| * | ||
| * When changing FlatLaf system requirements to Java 9+, | ||
| * then this method can be replaced with: | ||
| * return getPopup( owner, contents, x, y, true ); | ||
| */ | ||
| private Popup getHeavyWeightPopup( Component owner, Component contents, int x, int y ) | ||
| throws IllegalArgumentException | ||
| { | ||
| try { | ||
| if( SystemInfo.IS_JAVA_9_OR_LATER ) { | ||
| if( java9getPopupMethod == null ) { | ||
| java9getPopupMethod = PopupFactory.class.getDeclaredMethod( | ||
| "getPopup", Component.class, Component.class, int.class, int.class, boolean.class ); | ||
| } | ||
| return (Popup) java9getPopupMethod.invoke( this, owner, contents, x, y, true ); | ||
| } else { | ||
| // Java 8 | ||
| if( java8getPopupMethod == null ) { | ||
| java8getPopupMethod = PopupFactory.class.getDeclaredMethod( | ||
| "getPopup", Component.class, Component.class, int.class, int.class, int.class ); | ||
| java8getPopupMethod.setAccessible( true ); | ||
| } | ||
| return (Popup) java8getPopupMethod.invoke( this, owner, contents, x, y, /*HEAVY_WEIGHT_POPUP*/ 2 ); | ||
| } | ||
| } catch( NoSuchMethodException | SecurityException | IllegalAccessException | InvocationTargetException ex ) { | ||
| // ignore | ||
| return null; | ||
| } | ||
| } | ||
|
|
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| //---- class DropShadowPopup ---------------------------------------------- | ||
|
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| private static class DropShadowPopup | ||
| extends Popup | ||
| { | ||
| private Popup delegate; | ||
|
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| private JComponent parent; | ||
| private Border oldBorder; | ||
| private boolean oldOpaque; | ||
|
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| private Window window; | ||
| private Color oldBackground; | ||
|
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| DropShadowPopup( Popup delegate, Component contents ) { | ||
| this.delegate = delegate; | ||
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| if( delegate.getClass().getName().endsWith( "MediumWeightPopup" ) ) | ||
| return; | ||
|
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| Dimension size = contents.getPreferredSize(); | ||
| if( size.width <= 0 || size.height <= 0 ) | ||
| return; | ||
|
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| Container p = contents.getParent(); | ||
| if( !(p instanceof JComponent) ) | ||
| return; | ||
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| parent = (JComponent) p; | ||
| oldBorder = parent.getBorder(); | ||
| oldOpaque = parent.isOpaque(); | ||
| parent.setBorder( new FlatDropShadowBorder( null, 4, 4, 32 ) ); //TODO | ||
| parent.setOpaque( false ); | ||
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| window = SwingUtilities.windowForComponent( contents ); | ||
| if( window != null ) { | ||
| oldBackground = window.getBackground(); | ||
| window.setBackground( new Color( 0, true ) ); | ||
| window.setSize( window.getPreferredSize() ); | ||
| } else | ||
| parent.setSize( parent.getPreferredSize() ); | ||
| } | ||
|
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| @Override | ||
| public void show() { | ||
| delegate.show(); | ||
| } | ||
|
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| @Override | ||
| public void hide() { | ||
| if( delegate == null ) | ||
| return; | ||
|
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| delegate.hide(); | ||
|
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| if( parent != null ) { | ||
| parent.setBorder( oldBorder ); | ||
| parent.setOpaque( oldOpaque ); | ||
| parent = null; | ||
| } | ||
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| if( window != null ) { | ||
| window.setBackground( oldBackground ); | ||
| window = null; | ||
| } | ||
|
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| delegate = null; | ||
| } | ||
| } | ||
| } |
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