org.argeo.eclipse.ui/src/org/argeo/eclipse/ui/dialogs/LightweightDialog.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 org.argeo.eclipse.ui.EclipseUiException;
  19 import org.eclipse.swt.SWT;
  20 import org.eclipse.swt.events.FocusEvent;
  21 import org.eclipse.swt.events.FocusListener;
  22 import org.eclipse.swt.events.ShellAdapter;
  23 import org.eclipse.swt.events.ShellEvent;
  24 import org.eclipse.swt.graphics.Point;
  25 import org.eclipse.swt.graphics.Rectangle;
  26 import org.eclipse.swt.layout.GridData;
  27 import org.eclipse.swt.layout.GridLayout;
  28 import org.eclipse.swt.widgets.Composite;
  29 import org.eclipse.swt.widgets.Control;
  30 import org.eclipse.swt.widgets.Display;
  31 import org.eclipse.swt.widgets.Shell;
  32
  33 /** Generic lightweight dialog, not based on JFace. */
  34 public class LightweightDialog {
  35         // private final static Log log = LogFactory.getLog(LightweightDialog.class);
  36
  37         private Shell parentShell;
  38         private Shell backgroundShell;
  39         private Shell shell;
  40
  41         /** Tries to find a display */
  42         private static Display getDisplay() {
  43                 try {
  44                         Display display = Display.getCurrent();
  45                         if (display != null)
  46                                 return display;
  47                         else
  48                                 return Display.getDefault();
  49                 } catch (Exception e) {
  50                         return Display.getCurrent();
  51                 }
  52         }
  53
  54         public LightweightDialog(Shell parentShell) {
  55                 this.parentShell = parentShell;
  56         }
  57
  58         public void open() {
  59                 if (shell != null)
  60                         throw new EclipseUiException("There is already a shell");
  61                 backgroundShell = new Shell(parentShell, SWT.NO_TRIM | SWT.BORDER | SWT.ON_TOP);
  62                 backgroundShell.setMaximized(true);
  63                 backgroundShell.setAlpha(128);
  64                 backgroundShell.setBackground(getDisplay().getSystemColor(SWT.COLOR_BLACK));
  65                 backgroundShell.open();
  66                 shell = new Shell(backgroundShell, SWT.NO_TRIM | SWT.BORDER | SWT.ON_TOP);
  67                 shell.setLayout(new GridLayout());
  68                 // shell.setText("Error");
  69                 shell.setSize(getInitialSize());
  70                 createDialogArea(shell);
  71                 // shell.pack();
  72                 // shell.layout();
  73
  74                 Rectangle shellBounds = Display.getCurrent().getBounds();// RAP
  75                 Point dialogSize = shell.getSize();
  76                 int x = shellBounds.x + (shellBounds.width - dialogSize.x) / 2;
  77                 int y = shellBounds.y + (shellBounds.height - dialogSize.y) / 2;
  78                 shell.setLocation(x, y);
  79
  80                 shell.addShellListener(new ShellAdapter() {
  81                         private static final long serialVersionUID = -2701270481953688763L;
  82
  83                         @Override
  84                         public void shellDeactivated(ShellEvent e) {
  85                                 closeShell();
  86                         }
  87                 });
  88
  89                 shell.open();
  90                 // after the foreground shell has been opened
  91                 backgroundShell.addFocusListener(new FocusListener() {
  92                         private static final long serialVersionUID = 3137408447474661070L;
  93
  94                         @Override
  95                         public void focusLost(FocusEvent event) {
  96                         }
  97
  98                         @Override
  99                         public void focusGained(FocusEvent event) {
 100                                 closeShell();
 101                         }
 102                 });
 103         }
 104
 105         protected void closeShell() {
 106                 if (shell != null) {
 107                         shell.close();
 108                         shell.dispose();
 109                         shell = null;
 110                 }
 111
 112                 if (backgroundShell != null) {
 113                         backgroundShell.close();
 114                         backgroundShell.dispose();
 115                 }
 116         }
 117
 118         protected Point getInitialSize() {
 119                 // if (exception != null)
 120                 // return new Point(800, 600);
 121                 // else
 122                 return new Point(400, 400);
 123         }
 124
 125         protected Control createDialogArea(Composite parent) {
 126                 Composite dialogarea = new Composite(parent, SWT.NONE);
 127                 dialogarea.setLayout(new GridLayout());
 128                 dialogarea.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 129                 return dialogarea;
 130         }
 131 }