org.argeo.eclipse.ui/src/org/argeo/eclipse/ui/dialogs/NonModalErrorFeedback.java

   1 package org.argeo.eclipse.ui.dialogs;
   2
   3 import java.io.PrintWriter;
   4 import java.io.StringWriter;
   5
   6 import org.apache.commons.logging.Log;
   7 import org.apache.commons.logging.LogFactory;
   8 import org.argeo.eclipse.ui.EclipseUiException;
   9 import org.eclipse.swt.SWT;
  10 import org.eclipse.swt.events.ShellAdapter;
  11 import org.eclipse.swt.events.ShellEvent;
  12 import org.eclipse.swt.graphics.Point;
  13 import org.eclipse.swt.graphics.Rectangle;
  14 import org.eclipse.swt.layout.GridData;
  15 import org.eclipse.swt.layout.GridLayout;
  16 import org.eclipse.swt.widgets.Composite;
  17 import org.eclipse.swt.widgets.Control;
  18 import org.eclipse.swt.widgets.Display;
  19 import org.eclipse.swt.widgets.Label;
  20 import org.eclipse.swt.widgets.Shell;
  21 import org.eclipse.swt.widgets.Text;
  22
  23 /** Generic error dialog to be used in try/catch blocks */
  24 class NonModalErrorFeedback {
  25         private final static Log log = LogFactory
  26                         .getLog(NonModalErrorFeedback.class);
  27
  28         private final String message;
  29         private final Throwable exception;
  30
  31         private Shell shell;
  32
  33         public static void show(String message, Throwable e) {
  34                 // rethrow ThreaDeath in order to make sure that RAP will properly clean
  35                 // up the UI thread
  36                 if (e instanceof ThreadDeath)
  37                         throw (ThreadDeath) e;
  38
  39                 new NonModalErrorFeedback(getDisplay().getActiveShell(), message, e)
  40                                 .open();
  41         }
  42
  43         public static void show(String message) {
  44                 new NonModalErrorFeedback(getDisplay().getActiveShell(), message, null)
  45                                 .open();
  46         }
  47
  48         /** Tries to find a display */
  49         private static Display getDisplay() {
  50                 try {
  51                         Display display = Display.getCurrent();
  52                         if (display != null)
  53                                 return display;
  54                         else
  55                                 return Display.getDefault();
  56                 } catch (Exception e) {
  57                         return Display.getCurrent();
  58                 }
  59         }
  60
  61         public NonModalErrorFeedback(Shell parentShell, String message, Throwable e) {
  62                 this.message = message;
  63                 this.exception = e;
  64                 log.error(message, e);
  65         }
  66
  67         public void open() {
  68                 if (shell != null)
  69                         throw new EclipseUiException("There is already a shell");
  70                 shell = new Shell(getDisplay(), SWT.NO_TRIM | SWT.BORDER | SWT.ON_TOP);
  71                 shell.setLayout(new GridLayout());
  72                 // shell.setText("Error");
  73                 shell.setSize(getInitialSize());
  74                 createDialogArea(shell);
  75                 // shell.pack();
  76                 // shell.layout();
  77
  78                 Rectangle shellBounds = Display.getCurrent().getBounds();// RAP
  79                 Point dialogSize = shell.getSize();
  80                 int x = shellBounds.x + (shellBounds.width - dialogSize.x) / 2;
  81                 int y = shellBounds.y + (shellBounds.height - dialogSize.y) / 2;
  82                 shell.setLocation(x, y);
  83
  84                 shell.addShellListener(new ShellAdapter() {
  85                         private static final long serialVersionUID = -2701270481953688763L;
  86
  87                         @Override
  88                         public void shellDeactivated(ShellEvent e) {
  89                                 closeShell();
  90                         }
  91                 });
  92
  93                 shell.open();
  94         }
  95
  96         protected void closeShell() {
  97                 shell.close();
  98                 shell.dispose();
  99                 shell = null;
 100         }
 101
 102         protected Point getInitialSize() {
 103                 // if (exception != null)
 104                 // return new Point(800, 600);
 105                 // else
 106                 return new Point(400, 300);
 107         }
 108
 109         protected Control createDialogArea(Composite parent) {
 110                 Composite dialogarea = new Composite(parent, SWT.NONE);
 111                 dialogarea.setLayout(new GridLayout());
 112                 // Composite dialogarea = (Composite) super.createDialogArea(parent);
 113                 dialogarea.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 114
 115                 Label messageLbl = new Label(dialogarea, SWT.NONE);
 116                 if (message != null)
 117                         messageLbl.setText(message);
 118                 else if (exception != null)
 119                         messageLbl.setText(exception.getLocalizedMessage());
 120
 121                 Composite composite = new Composite(dialogarea, SWT.NONE);
 122                 composite.setLayout(new GridLayout(2, false));
 123                 composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 124
 125                 if (exception != null) {
 126                         Text stack = new Text(composite, SWT.MULTI | SWT.LEAD | SWT.BORDER
 127                                         | SWT.V_SCROLL | SWT.H_SCROLL);
 128                         stack.setEditable(false);
 129                         stack.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 130                         StringWriter sw = new StringWriter();
 131                         exception.printStackTrace(new PrintWriter(sw));
 132                         stack.setText(sw.toString());
 133                 }
 134
 135                 // parent.pack();
 136                 return composite;
 137         }
 138 }