/*******************************************************************************
* CogTool Copyright Notice and Distribution Terms
* CogTool 1.3, Copyright (c) 2005-2013 Carnegie Mellon University
* This software is distributed under the terms of the FSF Lesser
* Gnu Public License (see LGPL.txt).
*
* CogTool is free software; you can redistribute it and/or modify
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* the Free Software Foundation; either version 2.1 of the License, or
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*
* CogTool is distributed in the hope that it will be useful,
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* CogTool makes use of several third-party components, with the
* following notices:
*
* Eclipse SWT version 3.448
* Eclipse GEF Draw2D version 3.2.1
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* CLISP version 2.38
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* Copyright (c) Sam Steingold, Bruno Haible 2001-2006
* This software is distributed under the terms of the FSF Gnu Public License.
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* ACT-R 6.0
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* Copyright (c) 1998-2007 Dan Bothell, Mike Byrne, Christian Lebiere &
* John R Anderson.
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* Mozilla XULRunner 1.9.0.5
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******************************************************************************/
package edu.cmu.cs.hcii.cogtool.ui;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseEvent;
import edu.cmu.cs.hcii.cogtool.util.SWTContextMenuUtil;
import edu.cmu.cs.hcii.cogtool.util.WindowUtil;
import edu.cmu.cs.hcii.cogtool.view.PERTScrollBar;
/**
* Maintains the state of the mouse and handles mouse events for
* PERTChartScrollBar objects.
*
* @author jbc
*
*/
public class PERTChartScrollBarMouseState extends SWTMouseState
{
// Scrolling states for button presses
final static int NOT_SCROLLING = 0;
final static int LEFT_SCROLLING = 1;
final static int RIGHT_SCROLLING = 2;
// mouse states
final static int INACTIVE = 0;
final static int MOVING = 1;
final static int RESIZING_START = 2;
final static int RESIZING_END = 3;
final static int POTENTIAL_DRAWING = 4;
// Used to maintain the last known start and end values for a double-click,
// which alternates between
protected double lastStart;
protected double lastEnd;
// Current state of the mouse
protected int mouseState;
protected int mouseDownX;
// Horizontal distance from the mouse click to the leftmost edge of the
// active region. This is used for dragging to set the x position of the
// new active region.
protected int mouseOffset;
// PERTScrollBar object with which this mouse state is associated.
protected PERTScrollBar scrollBar;
public PERTChartScrollBarMouseState(PERTScrollBar visScrollBar, UI ui)
{
super(ui);
scrollBar = visScrollBar;
mouseState = INACTIVE;
mouseDownX = -1;
lastStart = 0.0;
lastEnd = scrollBar.getTotalTime();
}
@Override
protected void dealWithMouseMove(MouseEvent e)
{
super.dealWithMouseMove(e);
double start = scrollBar.getStart();
double end = scrollBar.getEnd();
// only react if the mouse has been down
if (mouseDownX > -1) {
double newStart;
double newEnd;
int lMargin = scrollBar.getLeftMargin();
double visWidth = scrollBar.getVisualizationWidth();
double tTime = scrollBar.getTotalTime();
switch (mouseState) {
case RESIZING_END:
newEnd = (((e.x - lMargin)) / visWidth) * tTime;
newEnd = Math.min(newEnd, tTime);
if (newEnd < start) {
mouseState = RESIZING_START;
scrollBar.changeRegion(newEnd, start, true);
}
else {
scrollBar.changeRegion(start, newEnd, true);
}
break;
case RESIZING_START:
newStart = ((e.x - lMargin) / visWidth) * tTime;
newStart = Math.max(0.0, newStart);
if (newStart > end) {
mouseState = RESIZING_END;
scrollBar.changeRegion(end, newStart, true);
}
else {
scrollBar.changeRegion(newStart, end, true);
}
break;
case MOVING:
newStart =
((((double) (e.x - lMargin) - (double) mouseOffset)
/ visWidth) * tTime);
scrollBar.changeRegion(newStart, newStart + (end - start));
break;
case POTENTIAL_DRAWING:
// hysteresis check - 3 pixels
if (Math.abs(mouseDownX - e.x) > 3) {
mouseState =
(mouseDownX < e.x) ? RESIZING_END : RESIZING_START;
newStart =
((mouseDownX - lMargin) / visWidth) * tTime;
newEnd = ((e.x - lMargin) / visWidth) * tTime;
scrollBar.changeRegion(newStart, newEnd, true);
}
break;
}
}
setCursor(e);
}
@Override
protected void dealWithMouseDown(MouseEvent e)
{
super.dealWithMouseDown(e);
if ((e.button == 1) && ! SWTContextMenuUtil.isContextMenu(e)) {
double start = scrollBar.getStart();
double end = scrollBar.getEnd();
mouseDownX = e.x;
double sbVisWidth = scrollBar.getVisualizationWidth();
double tTime = scrollBar.getTotalTime();
int lMargin = scrollBar.getLeftMargin();
mouseOffset =
(int) (e.x - ((sbVisWidth * start / tTime) + lMargin));
int startX = lMargin + (int) (sbVisWidth * (start / tTime));
int endX = lMargin + (int) (sbVisWidth * (end / tTime));
if ((e.x >= startX) && (e.x < startX + 5)) {
mouseState = RESIZING_START;
}
else if ((e.x <= endX) && (e.x > endX - 5)) {
mouseState = RESIZING_END;
}
else if ((e.x > endX) || (e.x < startX)) {
mouseState = POTENTIAL_DRAWING;
}
else {
mouseState = MOVING;
}
setCursor(e);
}
}
@Override
protected void dealWithMouseUp(MouseEvent e)
{
super.dealWithMouseUp(e);
double start = scrollBar.getStart();
double end = scrollBar.getEnd();
double sbVisWidth = scrollBar.getVisualizationWidth();
double tTime = scrollBar.getTotalTime();
double lMargin = scrollBar.getLeftMargin();
double clickTime = ((e.x - lMargin) / sbVisWidth) * tTime;
if (mouseState == POTENTIAL_DRAWING) {
// the user has single clicked outside of the currently
// selected region. We should recenter the selected region
// around the click
double visibleDistance = end - start;
double newStart = clickTime - (visibleDistance * 0.5);
newStart = Math.max(0, newStart);
newStart = Math.min(newStart, tTime - visibleDistance);
scrollBar.changeRegion(newStart, newStart + visibleDistance);
}
else if (mouseState == RESIZING_END) {
scrollBar.changeRegion(start, Math.min(clickTime, tTime));
}
else if (mouseState == RESIZING_START) {
scrollBar.changeRegion(Math.max(clickTime, 0), end);
}
mouseDownX = -1;
mouseState = INACTIVE;
setCursor(e);
}
@Override
protected void dealWithMouseDoubleClick(MouseEvent e)
{
super.dealWithMouseDoubleClick(e);
double start = scrollBar.getStart();
double end = scrollBar.getEnd();
if ((end == scrollBar.getTotalTime()) && (start == 0d)) {
end = lastEnd;
start = lastStart;
}
else {
lastEnd = end;
lastStart = start;
end = scrollBar.getTotalTime();
start = 0d;
}
scrollBar.changeRegion(start, end);
}
protected void setCursor(MouseEvent e)
{
//TODO: Pass in needed info, don't recalculate
double start = scrollBar.getStart();
double end = scrollBar.getEnd();
int lMargin = scrollBar.getLeftMargin();
double visWidth = scrollBar.getVisualizationWidth();
double tTime = scrollBar.getTotalTime();
int startLoc = lMargin + (int)(visWidth * (start / tTime));
int endLoc = lMargin + (int)(visWidth * (end / tTime));
// hand cursor mouse states cannot be set via normal mechanism, so
// check them first.
if (mouseState == MOVING) {
scrollBar.setCursor(scrollBar.getClosedHandCursor());
}
else if ((e.x >= startLoc + 5) && (e.x <= endLoc - 5) && (mouseDownX == -1))
{
scrollBar.setCursor(scrollBar.getOpenHandCursor());
}
else {
int cursor = SWT.CURSOR_ARROW;
if (mouseState == RESIZING_START) {
cursor = SWT.CURSOR_SIZEW;
}
else if (mouseState == RESIZING_END) {
cursor = SWT.CURSOR_SIZEE;
}
else if ((e.x >= startLoc) && (e.x < startLoc + 5)) {
cursor = SWT.CURSOR_SIZEW;
}
else if ((e.x <= endLoc) && (e.x > endLoc - 5)) {
cursor = SWT.CURSOR_SIZEE;
}
scrollBar.setCursor(WindowUtil.getCursor(cursor));
}
}
}