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Viewing changes to laf-widget/src/main/java/org/pushingpixels/lafwidget/tree/dnd/AutoScrollingTreeDropTarget.java

  • Committer: Package Import Robot
  • Author(s): Felix Natter
  • Date: 2016-01-18 20:58:45 UTC
  • Revision ID: package-import@ubuntu.com-20160118205845-crbmrkda61qsi5qa
Tags: upstream-7.3+dfsg2
Import upstream version 7.3+dfsg2

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laf-widget/src/main/java/org/pushingpixels/lafwidget/tree/dnd/AutoScrollingTreeDropTarget.java
 
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/*
 
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 * Copyright (c) 2005-2010 Laf-Widget Kirill Grouchnikov. All Rights Reserved.
 
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 *
 
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 * Redistribution and use in source and binary forms, with or without 
 
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 * modification, are permitted provided that the following conditions are met:
 
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 * 
 
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 *  o Redistributions of source code must retain the above copyright notice, 
 
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 *    this list of conditions and the following disclaimer. 
 
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 *     
 
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 *  o Redistributions in binary form must reproduce the above copyright notice, 
 
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 *    this list of conditions and the following disclaimer in the documentation 
 
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 *    and/or other materials provided with the distribution. 
 
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 *     
 
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 *  o Neither the name of Laf-Widget Kirill Grouchnikov nor the names of 
 
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 *    its contributors may be used to endorse or promote products derived 
 
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 *    from this software without specific prior written permission. 
 
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 *     
 
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 
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 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
 
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
 
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 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
 
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
 
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 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 
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 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
 
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 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
 
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 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 
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 */
 
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package org.pushingpixels.lafwidget.tree.dnd;
 
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import java.awt.Point;
 
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import java.awt.dnd.*;
 
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import javax.swing.*;
 
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class AutoScrollingTreeDropTarget extends DropTarget {
 
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        private JViewport viewport;
 
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        private int scrollUnits;
 
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        private JTree tree;
 
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        AutoScrollingTreeDropTarget(JTree aTree, DropTargetListener listener) {
 
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                super(aTree, DnDConstants.ACTION_COPY_OR_MOVE, listener);
 
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                this.viewport = (JViewport) SwingUtilities.getAncestorOfClass(
 
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                                JViewport.class, aTree);
 
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                this.scrollUnits = Math.max(aTree.getRowHeight(), 16);
 
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                this.tree = aTree;
 
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        }
 
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        private Point lastDragCursorLocn = new Point(0, 0);
 
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        @Override
 
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    protected void updateAutoscroll(Point dragCursorLocn) {
 
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                if (this.lastDragCursorLocn.equals(dragCursorLocn))
 
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                        return;
 
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                else
 
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                        this.lastDragCursorLocn.setLocation(dragCursorLocn);
 
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                this.doAutoscroll(dragCursorLocn);
 
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        }
 
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        @Override
 
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    protected void initializeAutoscrolling(Point p) {
 
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                this.doAutoscroll(p);
 
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        }
 
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        @Override
 
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    protected void clearAutoscroll() {
 
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        }
 
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        private static final int AUTOSCROLL_MARGIN = 16;
 
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        protected void doAutoscroll(Point aPoint) {
 
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                if (this.viewport == null)
 
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                        return;
 
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                Point treePosition = this.viewport.getViewPosition();
 
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                int vH = this.viewport.getExtentSize().height;
 
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                int vW = this.viewport.getExtentSize().width;
 
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                Point nextPoint = null;
 
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                if ((aPoint.y - treePosition.y) < AutoScrollingTreeDropTarget.AUTOSCROLL_MARGIN) {
 
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                        nextPoint = new Point(treePosition.x, Math.max(treePosition.y
 
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                                        - this.scrollUnits, 0));
 
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                } else if (treePosition.y + vH - aPoint.y < AutoScrollingTreeDropTarget.AUTOSCROLL_MARGIN) {
 
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                        nextPoint = new Point(treePosition.x, Math.min(aPoint.y
 
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                                        + AutoScrollingTreeDropTarget.AUTOSCROLL_MARGIN, this.tree
 
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                                        .getHeight()
 
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                                        - vH));
 
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                } else if (aPoint.x - treePosition.x < AutoScrollingTreeDropTarget.AUTOSCROLL_MARGIN) {
 
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                        nextPoint = new Point(Math.max(treePosition.x
 
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                                        - AutoScrollingTreeDropTarget.AUTOSCROLL_MARGIN, 0),
 
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                                        treePosition.y);
 
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                } else if (treePosition.x + vW - aPoint.x < AutoScrollingTreeDropTarget.AUTOSCROLL_MARGIN) {
 
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                        nextPoint = new Point(Math.min(treePosition.x
 
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                                        + AutoScrollingTreeDropTarget.AUTOSCROLL_MARGIN, this.tree
 
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                                        .getWidth()
 
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                                        - vW), treePosition.y);
 
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                }
 
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                if (nextPoint != null)
 
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                        this.viewport.setViewPosition(nextPoint);
 
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        }
 
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}
 
 
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