/*
* Copyright (c) 2007-2012 The Broad Institute, Inc.
* SOFTWARE COPYRIGHT NOTICE
* This software and its documentation are the copyright of the Broad Institute, Inc. All rights are reserved.
*
* This software is supplied without any warranty or guaranteed support whatsoever. The Broad Institute is not responsible for its use, misuse, or functionality.
*
* This software is licensed under the terms of the GNU Lesser General Public License (LGPL),
* Version 2.1 which is available at http://www.opensource.org/licenses/lgpl-2.1.php.
*/
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package org.broad.igv.ui.panel;
//~--- non-JDK imports --------------------------------------------------------
import org.broad.igv.ui.AbstractDataPanelTool;
import org.broad.igv.ui.IGV;
import org.broad.igv.ui.event.DragStoppedEvent;
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
/**
*
*/
public class PanTool extends AbstractDataPanelTool {
private int previousYDirection = 0; // Drag Directions: 1=up, 0=none 0r -1=down
//private int lastMousePressedY;
private int cumulativeDeltaX;
private int cumulativeDeltaY;
private Point lastMousePoint;
//private JViewport viewport;
private JScrollBar verticalScrollBar;
private boolean isDragging = false;
private Cursor dragCursor;
private ReferenceFrame referenceFrame;
public PanTool(DataPanel owner) {
super(owner, Cursor.getDefaultCursor());
this.dragCursor = IGV.fistCursor;
setName("Pan");
if (owner != null) {
verticalScrollBar = owner.getVerticalScrollbar();
Container parentContainer = owner.getParent();
if (parentContainer != null) {
Container parentOfParent = parentContainer.getParent();
if ((parentOfParent != null) && (parentOfParent instanceof JViewport)) {
//viewport = (JViewport) parentOfParent;
}
}
}
}
@Override
public Cursor getCursor() {
return isDragging ? dragCursor : Cursor.getDefaultCursor();
}
public Point getLastMousePoint() {
return lastMousePoint;
}
@Override
public void mousePressed(final MouseEvent e) {
if(e.isPopupTrigger()) {
return;
}
lastMousePoint = e.getPoint();
cumulativeDeltaX = 0;
cumulativeDeltaY = 0;
}
public void setReferenceFrame(ReferenceFrame frame){
this.referenceFrame = frame;
}
@Override
public ReferenceFrame getReferenceFame() {
if(referenceFrame != null) return referenceFrame;
return super.getReferenceFame();
}
public void mouseReleased(final MouseEvent e) {
if (isDragging) {
isDragging = false;
getReferenceFame().getEventBus().post(new DragStoppedEvent());
}
Component panel = (Component) e.getSource();
panel.setCursor(getCursor());
}
@Override
final public void mouseDragged(final MouseEvent e) {
try {
Component panel = (Component) e.getSource();
panel.setCursor(dragCursor);
if (lastMousePoint == null) {
lastMousePoint = e.getPoint();
return;
}
if (!isDragging && e.getPoint().distance(lastMousePoint) < 2) {
return;
} else {
isDragging = true;
int deltaX = lastMousePoint.x - e.getX();
int deltaY = lastMousePoint.y - e.getY();
cumulativeDeltaX += Math.abs(deltaX);
cumulativeDeltaY += Math.abs(deltaY);
// Test for horizontal vs vertical panning.
if (cumulativeDeltaX > cumulativeDeltaY) {
// Horizontal scrolling
getReferenceFame().shiftOriginPixels(deltaX);
} else {
// Vertical Scrolling
int totalYChange = (int) (lastMousePoint.getY() - e.getY());
if (totalYChange != 0) {
// This section handles false drag direction changes
int currentYDirection = 0;
// Figure out the current drag direction
currentYDirection = totalYChange / Math.abs(totalYChange);
// If the previous direction is 0 we were not moving before
if (previousYDirection != 0) {
// See if we changed direction
boolean changedYDirection = currentYDirection != previousYDirection;
if (!changedYDirection) {
// Don't save lastMousePressedPoint because may
// be incorrect (this is the problem we are
// solving with the direction flag) instead
// we'll just check the next drag Point to be
// sure of the correct direction.
previousYDirection = currentYDirection;
// If we have a vertical scrollbar use it to move
if (verticalScrollBar != null) {
int adjustedScrollbarValue = verticalScrollBar.getValue();
adjustedScrollbarValue += totalYChange;
verticalScrollBar.setValue(adjustedScrollbarValue);
}
}
}
previousYDirection = currentYDirection;
}
}
}
} finally {
lastMousePoint = e.getPoint(); // Always save the last Point
}
}
}