Durga
Reputation: 317
After running an Eclipse SWT application it shows many exceptions
After running my SWT application it doesn’t have any error at the time of compilation. But after running it will shows the output for few sec and then the eclipse instance will become not responsive. Please help me to avoid exceptions I try to increase heap size.anybody is here to help me.....plzzzzzzzzzzzzzzzzzzzz
here i will give my code. i think my logic also have a problem. but i dont know how to correct it. i just follow on book to do this.here it is a program for clock. and i did in each movement of second hand a new thread is created. i want to make it as one thread. it shows unable to create new native threads activator.java
package com.packtpub.e4.clock.ui;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tray;
import org.eclipse.swt.widgets.TrayItem;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;
/**
* The activator class controls the plug-in life cycle
*/
public class Activator extends AbstractUIPlugin {
// The plug-in ID
public static final String PLUGIN_ID = "com.packtpub.e4.clock.ui"; //$NON-NLS-1$
// The shared instance
private static Activator plugin;
private TrayItem trayItem;
private Image image;
private Shell shell;
/**
* The constructor
*/
public Activator() {
}
/*
* (non-Javadoc)
* @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)
*/
public void start(BundleContext context) throws Exception {
super.start(context);
plugin = this;
final Display display = Display.getDefault();
display.asyncExec(new Runnable() {
public void run() {
image = new Image(display, Activator.class.getResourceAsStream("/icons/sample.gif"));
Tray tray = display.getSystemTray();
if (tray != null && image != null) {
trayItem = new TrayItem(tray, SWT.NONE);
trayItem.setToolTipText("Hello World");
trayItem.setVisible(true);
trayItem.setText("Hello World");
trayItem.setImage(new Image(trayItem.getDisplay(),
Activator.class.getResourceAsStream("/icons/sample.gif")));
}
trayItem.addSelectionListener(new SelectionListener() {
public void widgetSelected(SelectionEvent e) {
if (shell == null) {
shell = new Shell(trayItem.getDisplay());
shell.setLayout(new FillLayout());
new ClockWidget(shell, SWT.NONE, new RGB(255, 0, 255));
shell.pack();
}
shell.open();
}
@Override
public void widgetDefaultSelected(SelectionEvent e) {
// TODO Auto-generated method stub
}
});
}
});
}
/*
* (non-Javadoc)
* @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
*/
public void stop(BundleContext context) throws Exception {
if (trayItem != null && !trayItem.isDisposed()) {
Display.getDefault().asyncExec(new Runnable() {
public void run() {
if (trayItem != null && !trayItem.isDisposed())
trayItem.dispose();
}
});
}
if (image != null && !image.isDisposed()) {
Display.getDefault().asyncExec(new Runnable() {
public void run() {
if (image != null && !image.isDisposed())
image.dispose();
}
});
}
if (shell != null && !shell.isDisposed()) {
Display.getDefault().asyncExec(new Runnable() {
public void run() {
if (shell != null && !shell.isDisposed())
shell.dispose();
}
});
}
}
/**
* Returns the shared instance
*
* @return the shared instance
*/
public static Activator getDefault() {
return plugin;
}
/**
* Returns an image descriptor for the image file at the given
* plug-in relative path
*
* @param path the path
* @return the image descriptor
*/
public static ImageDescriptor getImageDescriptor(String path) {
return imageDescriptorFromPlugin(PLUGIN_ID, path);
}
}
clockwidget.java
package com.packtpub.e4.clock.ui;
import java.util.Date;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
public class ClockWidget extends Canvas
{
private final Color color;
private int offset;
public void setOffset(int offset)
{
this.offset = offset;
}
public Color getColor()
{
return color;
}
public int getOffset()
{
return offset;
}
public ClockWidget(Composite parent, int style,RGB rgb)
{
super(parent, style);
this.color = new Color(parent.getDisplay(),rgb);
addDisposeListener(new DisposeListener()
{
public void widgetDisposed(DisposeEvent e)
{
if(color != null && !color.isDisposed())
color.dispose();
}
});
addPaintListener(new PaintListener()
{
public void paintControl(PaintEvent e)
{
ClockWidget.this.paintControl(e);
}
});
}
public void paintControl(PaintEvent e)
{
@SuppressWarnings("deprecation")
int seconds = new Date().getSeconds();
int arc = (15-seconds) * 6 % 360;
e.gc.setBackground(color);
e.gc.fillArc(e.x,e.y,e.width-1,e.height-1,arc-1,2);
e.gc.drawArc(e.x,e.y,e.width-1,e.height-1,0,360);
e.gc.setBackground(e.display.getSystemColor(SWT.COLOR_BLACK));
@SuppressWarnings("deprecation")
int hours = new Date().getHours() + offset;
arc = (3 - hours) * 30 % 360;
e.gc.fillArc(e.x, e.y, e.width-1, e.height-1, arc - 5, 10);
new Thread("TickTock")
{
public void run()
{
while (!ClockWidget.this.isDisposed())
{
ClockWidget.this.getDisplay().asyncExec(
new Runnable()
{
public void run()
{
if (!ClockWidget.this.isDisposed())
ClockWidget.this.redraw();
}
});
try
{
Thread.sleep(99999);
}
catch (InterruptedException e)
{
System.out.println("@clock"+e.toString());
return;
}
}
}
}.start();
}
public Point computeSize(int w,int h,boolean changed)
{
int size;
if(w == SWT.DEFAULT)
{
size = h;
}
else if (h == SWT.DEFAULT)
{
size = w;
}
else
{
size = Math.min(w,h);
}
if(size == SWT.DEFAULT)
size = 50;
return new Point(size,size);
}
}
SampleView.java
package com.packtpub.e4.clock.ui.views;
import java.util.TimeZone;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.part.*;
import org.eclipse.swt.SWT;
import com.packtpub.e4.clock.ui.ClockWidget;
public class SampleView extends ViewPart {
private Combo timezones;
public void createPartControl(Composite parent) {
try{
RowLayout layout = new RowLayout(SWT.HORIZONTAL);
parent.setLayout(layout);
Object[] oo=parent.getDisplay().getDeviceData().objects;
int c = 0;
for (int j = 0; j < oo.length; j++)
if (oo[j] instanceof Color)
c++;
System.err.println("There are " + c + " Color instances");
final ClockWidget clock1 =new ClockWidget(parent, SWT.NONE, new RGB(255,0,0));
//final ClockWidget clock2 =new ClockWidget(parent, SWT.NONE, new RGB(0,255,0));
//final ClockWidget clock3 =new ClockWidget(parent, SWT.NONE, new RGB(0,0,255));
//clock1.setLayoutData(new RowData(20,20));
//clock3.setLayoutData(new RowData(100,100));
String[] ids = TimeZone.getAvailableIDs();
timezones = new Combo(parent, SWT.SIMPLE);
timezones.setVisibleItemCount(5);
for (int i = 0; i < ids.length; i++) {
timezones.add(ids[i]);
timezones.addSelectionListener(new SelectionListener() {
public void widgetSelected(SelectionEvent e) {
String z = timezones.getText();
TimeZone tz = z == null ? null : TimeZone.getTimeZone(z);
TimeZone dt = TimeZone.getDefault();
int offset = tz == null ? 0 : (
tz.getOffset(System.currentTimeMillis()) -
dt.getOffset(System.currentTimeMillis())) / 3600000;
clock1.setOffset(offset);
clock1.redraw();
}
public void widgetDefaultSelected(SelectionEvent e) {
clock1.setOffset(0);
clock1.redraw();
}
});
}
}catch(Exception e){
System.out.println("@ SampleView.java"+e.toString());
}
}
public void setFocus() {
timezones.setFocus();
}
}
Upvotes: 2
Views: 716
Answers (1)
Durga
Reputation: 317
i got the answer... here the thread call is happend in clockwidgets paintcontrol function cut it from there and paste it on clockwidget constructor. then the code will work proper package com.packtpub.e4.clock.ui;
import java.util.Date;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
public class ClockWidget extends Canvas
{
private final Color color;
private int offset;
public void setOffset(int offset)
{
this.offset = offset;
}
public Color getColor()
{
return color;
}
public int getOffset()
{
return offset;
}
public ClockWidget(Composite parent, int style,RGB rgb)
{
super(parent, style);
this.color = new Color(parent.getDisplay(),rgb);
addDisposeListener(new DisposeListener()
{
public void widgetDisposed(DisposeEvent e)
{
if(color != null && !color.isDisposed())
color.dispose();
}
});
new Thread("TickTock")
{
public void run()
{
while (!ClockWidget.this.isDisposed())
{
ClockWidget.this.getDisplay().asyncExec(
new Runnable()
{
public void run()
{
if (!ClockWidget.this.isDisposed())
ClockWidget.this.redraw();
}
});
try
{
Thread.sleep(1000);
}
catch (InterruptedException e)
{
return;
}
}
}
}.start();
addPaintListener(new PaintListener()
{
public void paintControl(PaintEvent e)
{
ClockWidget.this.paintControl(e);
}
});
}
public void paintControl(PaintEvent e)
{
@SuppressWarnings("deprecation")
int seconds = new Date().getSeconds();
int arc = (15-seconds) * 6 % 360;
e.gc.setBackground(color);
e.gc.fillArc(e.x,e.y,e.width-1,e.height-1,arc-1,2);
e.gc.drawArc(e.x,e.y,e.width-1,e.height-1,0,360);
e.gc.setBackground(e.display.getSystemColor(SWT.COLOR_BLACK));
@SuppressWarnings("deprecation")
int hours = new Date().getHours() + offset;
arc = (3 - hours) * 30 % 360;
e.gc.fillArc(e.x, e.y, e.width-1, e.height-1, arc - 5, 10);
}
public Point computeSize(int w,int h,boolean changed)
{
int size;
if(w == SWT.DEFAULT)
{
size = h;
}
else if (h == SWT.DEFAULT)
{
size = w;
}
else
{
size = Math.min(w,h);
}
if(size == SWT.DEFAULT)
size = 50;
return new Point(size,size);
}
}
Upvotes: 1
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