---
category: swing
folder: InternalFrameKeyInputOperation
title: JInternalFrameをキー入力で移動、リサイズする
tags: [JInternalFrame, JDesktopPane, InputMap]
author: aterai
pubdate: 2018-11-26T16:07:53+09:00
description: JInternalFrameのカーソルキー入力による移動、リサイズをテストします。
image: https://drive.google.com/uc?id=1xHC1_oVY3HI0SGcsd2zG2jsWp2CPMhMucg
---
* Summary [#summary]
`JInternalFrame`のカーソルキー入力による移動、リサイズをテストします。
#download(https://drive.google.com/uc?id=1xHC1_oVY3HI0SGcsd2zG2jsWp2CPMhMucg)
* Source Code Examples [#sourcecode]
#code(link){{
InputMap im = desktop.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
int modifiers = InputEvent.CTRL_DOWN_MASK;
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, modifiers), "shrinkUp");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, modifiers), "shrinkDown");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, modifiers), "shrinkLeft");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, modifiers), "shrinkRight");
}}
* Explanation [#explanation]
- `move`: `ctrl pressed F7`
-- KBD{Ctrl+F7}で現在フォーカスが存在する`JInternalFrame`をカーソルキーで移動可能なモードになる
-- `JInternalFrame`を完全に`JDesktopPane`の範囲外にカーソルキーで移動は不可
-- アイコン化したフレームを移動可能な`WindowsLookAndFeel`などの場合でもカーソルキーでのアイコン移動は不可
-- KBD{ESC}で移動モードは解除可能
--- 別`JInternalFrame`に選択が移動した場合も解除になる
- `resize`: `ctrl pressed F8`
-- KBD{Ctrl+F8}で現在フォーカスが存在する`JInternalFrame`をカーソルキーでリサイズ可能なモードになる
-- マウスによるリサイズが不可の場合でもカーソルキーでのリサイズは可能
-- デフォルトでは拡大のみ可能で縮小`Action`にはキー入力が割り当てられていないため、このサンプルではKBD{Ctrl+UP}などで`JInternalFrame`の上辺を縮小方向にリサイズ可能になるよう設定している
--- `JInternalFrame`ではなく`JDesktopPane`の`InputMap`に設定を追加する必要がある
-- `NimbusLookAndFeel`ではカーソルキーによるリサイズで`NullPointerException`が発生する
--- `1.8.0_192`、`11.0.1`ともにエラーになる
--- `Java 21`で修正済
#code{{
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at java.desktop/javax.swing.plaf.basic.BasicDesktopPaneUI$Actions.actionPerformed(BasicDesktopPaneUI.java:472)
at java.desktop/javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1810)
at java.desktop/javax.swing.JComponent.processKeyBinding(JComponent.java:2900)
at java.desktop/javax.swing.JComponent.processKeyBindings(JComponent.java:2962)
at java.desktop/javax.swing.JComponent.processKeyEvent(JComponent.java:2862)
at java.desktop/java.awt.Component.processEvent(Component.java:6409)
at java.desktop/java.awt.Container.processEvent(Container.java:2263)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5008)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4840)
at java.desktop/java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1950)
at java.desktop/java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:871)
at java.desktop/java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1140)
at java.desktop/java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:1010)
at java.desktop/java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:836)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4840)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
}}
- `close`: `ctrl pressed F4`
- `restore`: `ctrl pressed F5`
- `selectNextFrame`: `ctrl pressed F6`
- `minimize`: `ctrl pressed F9`
-- マウスによる最小化が不可の場合、キー入力による最小化も不可
- `maximize`: `ctrl pressed F10`
-- マウスによる最大化が不可の場合、キー入力による最大化も不可
* Reference [#reference]
- [[JComponentのKeyBinding一覧を取得する>Swing/KeyBinding]]
- [https://bugs.openjdk.org/browse/JDK-6603771 JDK-6603771 Nimbus L&F: Ctrl+F7 keybinding for JInternal Frame throws a NPE. - Java Bug System]
-- リサイズなどで`NullPointerException`になるのは`NimbusLookAndFeel`が入った最初からのバグらしい
* コメント [#comment]
* Comment [#comment]
#comment
#comment