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

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.eclipse.ui.dialogs;
  17
  18 import java.io.PrintWriter;
  19 import java.io.StringWriter;
  20
  21 import org.apache.commons.logging.Log;
  22 import org.apache.commons.logging.LogFactory;
  23 import org.argeo.eclipse.ui.EclipseUiException;
  24 import org.eclipse.swt.SWT;
  25 import org.eclipse.swt.events.ShellAdapter;
  26 import org.eclipse.swt.events.ShellEvent;
  27 import org.eclipse.swt.graphics.Point;
  28 import org.eclipse.swt.graphics.Rectangle;
  29 import org.eclipse.swt.layout.GridData;
  30 import org.eclipse.swt.layout.GridLayout;
  31 import org.eclipse.swt.widgets.Composite;
  32 import org.eclipse.swt.widgets.Control;
  33 import org.eclipse.swt.widgets.Display;
  34 import org.eclipse.swt.widgets.Label;
  35 import org.eclipse.swt.widgets.Shell;
  36 import org.eclipse.swt.widgets.Text;
  37
  38 /** Generic error dialog to be used in try/catch blocks */
  39 class NonModalErrorFeedback {
  40         private final static Log log = LogFactory
  41                         .getLog(NonModalErrorFeedback.class);
  42
  43         private final String message;
  44         private final Throwable exception;
  45
  46         private Shell shell;
  47
  48         public static void show(String message, Throwable e) {
  49                 // rethrow ThreaDeath in order to make sure that RAP will properly clean
  50                 // up the UI thread
  51                 if (e instanceof ThreadDeath)
  52                         throw (ThreadDeath) e;
  53
  54                 new NonModalErrorFeedback(getDisplay().getActiveShell(), message, e)
  55                                 .open();
  56         }
  57
  58         public static void show(String message) {
  59                 new NonModalErrorFeedback(getDisplay().getActiveShell(), message, null)
  60                                 .open();
  61         }
  62
  63         /** Tries to find a display */
  64         private static Display getDisplay() {
  65                 try {
  66                         Display display = Display.getCurrent();
  67                         if (display != null)
  68                                 return display;
  69                         else
  70                                 return Display.getDefault();
  71                 } catch (Exception e) {
  72                         return Display.getCurrent();
  73                 }
  74         }
  75
  76         public NonModalErrorFeedback(Shell parentShell, String message, Throwable e) {
  77                 this.message = message;
  78                 this.exception = e;
  79                 log.error(message, e);
  80         }
  81
  82         public void open() {
  83                 if (shell != null)
  84                         throw new EclipseUiException("There is already a shell");
  85                 shell = new Shell(getDisplay(), SWT.NO_TRIM | SWT.BORDER | SWT.ON_TOP);
  86                 shell.setLayout(new GridLayout());
  87                 // shell.setText("Error");
  88                 shell.setSize(getInitialSize());
  89                 createDialogArea(shell);
  90                 // shell.pack();
  91                 // shell.layout();
  92
  93                 Rectangle shellBounds = Display.getCurrent().getBounds();// RAP
  94                 Point dialogSize = shell.getSize();
  95                 int x = shellBounds.x + (shellBounds.width - dialogSize.x) / 2;
  96                 int y = shellBounds.y + (shellBounds.height - dialogSize.y) / 2;
  97                 shell.setLocation(x, y);
  98
  99                 shell.addShellListener(new ShellAdapter() {
 100                         private static final long serialVersionUID = -2701270481953688763L;
 101
 102                         @Override
 103                         public void shellDeactivated(ShellEvent e) {
 104                                 closeShell();
 105                         }
 106                 });
 107
 108                 shell.open();
 109         }
 110
 111         protected void closeShell() {
 112                 shell.close();
 113                 shell.dispose();
 114                 shell = null;
 115         }
 116
 117         protected Point getInitialSize() {
 118                 // if (exception != null)
 119                 // return new Point(800, 600);
 120                 // else
 121                 return new Point(400, 300);
 122         }
 123
 124         protected Control createDialogArea(Composite parent) {
 125                 Composite dialogarea = new Composite(parent, SWT.NONE);
 126                 dialogarea.setLayout(new GridLayout());
 127                 // Composite dialogarea = (Composite) super.createDialogArea(parent);
 128                 dialogarea.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 129
 130                 Label messageLbl = new Label(dialogarea, SWT.NONE);
 131                 if (message != null)
 132                         messageLbl.setText(message);
 133                 else if (exception != null)
 134                         messageLbl.setText(exception.getLocalizedMessage());
 135
 136                 Composite composite = new Composite(dialogarea, SWT.NONE);
 137                 composite.setLayout(new GridLayout(2, false));
 138                 composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 139
 140                 if (exception != null) {
 141                         Text stack = new Text(composite, SWT.MULTI | SWT.LEAD | SWT.BORDER
 142                                         | SWT.V_SCROLL | SWT.H_SCROLL);
 143                         stack.setEditable(false);
 144                         stack.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 145                         StringWriter sw = new StringWriter();
 146                         exception.printStackTrace(new PrintWriter(sw));
 147                         stack.setText(sw.toString());
 148                 }
 149
 150                 // parent.pack();
 151                 return composite;
 152         }
 153 }