author | aghaisas |
Mon, 10 Jul 2017 14:55:29 +0530 | |
changeset 47151 | 362dcbee0613 |
parent 43722 | 25ba19c20260 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package javax.swing; |
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import java.awt.*; |
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import java.awt.event.*; |
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/** |
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* Autoscroller is responsible for generating synthetic mouse dragged |
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* events. It is the responsibility of the Component (or its MouseListeners) |
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* that receive the events to do the actual scrolling in response to the |
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* mouse dragged events. |
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* |
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* @author Dave Moore |
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* @author Scott Violet |
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*/ |
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class Autoscroller implements ActionListener { |
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/** |
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* Global Autoscroller. |
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*/ |
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private static Autoscroller sharedInstance = new Autoscroller(); |
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// As there can only ever be one autoscroller active these fields are |
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// static. The Timer is recreated as necessary to target the appropriate |
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// Autoscroller instance. |
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private static MouseEvent event; |
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private static Timer timer; |
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private static JComponent component; |
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// |
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// The public API, all methods are cover methods for an instance method |
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// |
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/** |
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* Stops autoscroll events from happening on the specified component. |
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*/ |
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public static void stop(JComponent c) { |
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sharedInstance._stop(c); |
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} |
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/** |
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* Stops autoscroll events from happening on the specified component. |
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*/ |
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public static boolean isRunning(JComponent c) { |
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return sharedInstance._isRunning(c); |
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} |
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/** |
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* Invoked when a mouse dragged event occurs, will start the autoscroller |
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* if necessary. |
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*/ |
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public static void processMouseDragged(MouseEvent e) { |
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sharedInstance._processMouseDragged(e); |
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} |
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Autoscroller() { |
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} |
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/** |
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* Starts the timer targeting the passed in component. |
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*/ |
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43722
25ba19c20260
8143077: Deprecate InputEvent._MASK in favor of InputEvent._DOWN_MASK
serb
parents:
25859
diff
changeset
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@SuppressWarnings("deprecation") |
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private void start(JComponent c, MouseEvent e) { |
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Point screenLocation = c.getLocationOnScreen(); |
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if (component != c) { |
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_stop(component); |
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} |
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component = c; |
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event = new MouseEvent(component, e.getID(), e.getWhen(), |
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e.getModifiers(), e.getX() + screenLocation.x, |
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e.getY() + screenLocation.y, |
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e.getXOnScreen(), |
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e.getYOnScreen(), |
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e.getClickCount(), e.isPopupTrigger(), |
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MouseEvent.NOBUTTON); |
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if (timer == null) { |
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timer = new Timer(100, this); |
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} |
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if (!timer.isRunning()) { |
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timer.start(); |
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} |
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} |
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// |
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// Methods mirror the public static API |
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// |
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/** |
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* Stops scrolling for the passed in widget. |
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*/ |
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private void _stop(JComponent c) { |
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if (component == c) { |
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if (timer != null) { |
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timer.stop(); |
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} |
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timer = null; |
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event = null; |
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component = null; |
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} |
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} |
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/** |
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* Returns true if autoscrolling is currently running for the specified |
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* widget. |
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*/ |
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private boolean _isRunning(JComponent c) { |
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return (c == component && timer != null && timer.isRunning()); |
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} |
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/** |
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* MouseListener method, invokes start/stop as necessary. |
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*/ |
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private void _processMouseDragged(MouseEvent e) { |
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JComponent component = (JComponent)e.getComponent(); |
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boolean stop = true; |
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if (component.isShowing()) { |
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Rectangle visibleRect = component.getVisibleRect(); |
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stop = visibleRect.contains(e.getX(), e.getY()); |
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} |
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if (stop) { |
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_stop(component); |
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} else { |
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start(component, e); |
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} |
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} |
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// |
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// ActionListener |
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// |
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/** |
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* ActionListener method. Invoked when the Timer fires. This will scroll |
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* if necessary. |
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*/ |
|
43722
25ba19c20260
8143077: Deprecate InputEvent._MASK in favor of InputEvent._DOWN_MASK
serb
parents:
25859
diff
changeset
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@SuppressWarnings("deprecation") |
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public void actionPerformed(ActionEvent x) { |
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JComponent component = Autoscroller.component; |
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if (component == null || !component.isShowing() || (event == null)) { |
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_stop(component); |
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return; |
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} |
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Point screenLocation = component.getLocationOnScreen(); |
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MouseEvent e = new MouseEvent(component, event.getID(), |
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event.getWhen(), event.getModifiers(), |
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event.getX() - screenLocation.x, |
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event.getY() - screenLocation.y, |
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event.getXOnScreen(), |
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event.getYOnScreen(), |
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event.getClickCount(), |
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event.isPopupTrigger(), |
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MouseEvent.NOBUTTON); |
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component.superProcessMouseMotionEvent(e); |
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} |
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} |