--- /dev/null
+/*
+ * Copyright (c) 2009, Takeyuki Nagao
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the
+ * following conditions are met:
+ *
+ * * Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the
+ * following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the
+ * following disclaimer in the documentation and/or other
+ * materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ */
+
+package jp.sourceforge.dvibrowser.dvicore.gui.swing;
+
+import java.awt.Component;
+import java.awt.Container;
+import java.awt.Cursor;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.event.MouseEvent;
+
+import javax.swing.JScrollBar;
+import javax.swing.JScrollPane;
+import javax.swing.JViewport;
+import javax.swing.SwingUtilities;
+import javax.swing.event.MouseInputAdapter;
+
+// TODO: support logging
+public class DragToScroll
+extends MouseInputAdapter
+{
+ // Should we make them weak-references?
+ private final JScrollPane jsp;
+ private final JScrollBar hsb, vsb;
+ // TODO: Handle property change by sp.setXXXScrollBar().
+
+ public DragToScroll(JScrollPane jsp) {
+ this.jsp = jsp;
+ hsb = jsp.getHorizontalScrollBar();
+ vsb = jsp.getVerticalScrollBar();
+ }
+
+ public JScrollPane scrollPane() { return jsp; }
+
+ public void add(Component c) {
+ if (c == null) return;
+ addComponent(c);
+ if (c instanceof Container) {
+ Component [] cs = ((Container) c).getComponents();
+ for (int i=0; i<cs.length; i++) {
+ add(cs[i]);
+ }
+ }
+ }
+
+ private void addComponent(Component c) {
+ c.addMouseMotionListener(this);
+ c.addMouseListener(this);
+ }
+
+ public void remove(Component c) {
+ if (c == null) return;
+ if (c instanceof Container) {
+ Component [] cs = ((Container) c).getComponents();
+ for (int i=0; i<cs.length; i++) {
+ remove(cs[i]);
+ }
+ }
+ removeComponent(c);
+ }
+
+ private void removeComponent(Component c) {
+ if (c == null) return;
+ c.removeMouseMotionListener(this);
+ c.removeMouseListener(this);
+ }
+
+ public void mouseClicked(MouseEvent e)
+ {
+ debug("mouseClicked");
+ }
+
+ public void mouseEntered(MouseEvent e)
+ {
+ debug("mouseEntered");
+ }
+ public void mouseExited(MouseEvent e)
+ {
+ debug("mouseExited");
+ }
+ private int saveX, saveY;
+ private void savePoint(int x, int y) {
+ saveX = x;
+ saveY = y;
+ }
+
+ public void mousePressed(MouseEvent e)
+ {
+ debug("mousePressed");
+ Cursor cursor = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
+ Component c = (Component) e.getSource();
+ c.setCursor(cursor);
+
+ if (!e.isPopupTrigger()) {
+ Point p = e.getPoint();
+ SwingUtilities.convertPointToScreen(p, e.getComponent());
+ savePoint(p.x, p.y);
+ }
+ }
+ public void mouseReleased(MouseEvent e)
+ {
+ debug("mouseReleased");
+ Component c = (Component) e.getSource();
+ c.setCursor(null);
+ }
+
+ public void mouseDragged(MouseEvent e)
+ {
+ if (!e.isPopupTrigger()) {
+ Component c = e.getComponent();
+ debug(e.getSource() + ": mouseDragged");
+ Point p = e.getPoint();
+ SwingUtilities.convertPointToScreen(p, c);
+ int dx = p.x - saveX;
+ int dy = p.y - saveY;
+
+ debug("(dx,dy)=(" + dx + "," + dy + ")");
+
+ savePoint(p.x, p.y);
+
+ if (dy == 0) {
+ hsb.setValue(hsb.getValue() - dx);
+ } else if (dx == 0) {
+ vsb.setValue(vsb.getValue() - dy);
+ } else {
+ JViewport jv = jsp.getViewport();
+ jv.scrollRectToVisible(
+ new Rectangle(-dx, -dy, jv.getWidth(), jv.getHeight())
+ );
+ }
+ }
+ }
+
+ public void mouseMoved(MouseEvent e)
+ {
+ debug("mouseMoved");
+ }
+
+ private static void debug(String str) {
+// System.out.println(str);
+ }
+}
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