rcp/org.argeo.minidesktop/src/org/argeo/minidesktop/MiniImageViewer.java

   1 package org.argeo.minidesktop;
   2
   3 import java.io.IOException;
   4 import java.net.MalformedURLException;
   5 import java.net.URISyntaxException;
   6 import java.net.URL;
   7 import java.nio.file.Path;
   8 import java.nio.file.Paths;
   9
  10 import org.eclipse.swt.SWT;
  11 import org.eclipse.swt.events.PaintEvent;
  12 import org.eclipse.swt.events.PaintListener;
  13 import org.eclipse.swt.events.SelectionAdapter;
  14 import org.eclipse.swt.events.SelectionEvent;
  15 import org.eclipse.swt.graphics.Image;
  16 import org.eclipse.swt.graphics.ImageData;
  17 import org.eclipse.swt.graphics.ImageLoader;
  18 import org.eclipse.swt.graphics.Point;
  19 import org.eclipse.swt.layout.GridData;
  20 import org.eclipse.swt.layout.GridLayout;
  21 import org.eclipse.swt.layout.RowLayout;
  22 import org.eclipse.swt.widgets.Button;
  23 import org.eclipse.swt.widgets.Canvas;
  24 import org.eclipse.swt.widgets.Composite;
  25 import org.eclipse.swt.widgets.Display;
  26 import org.eclipse.swt.widgets.FileDialog;
  27 import org.eclipse.swt.widgets.Shell;
  28
  29 public class MiniImageViewer implements PaintListener {
  30         private URL url;
  31         private Canvas area;
  32
  33         private Image image;
  34
  35         public MiniImageViewer(Composite parent, int style) {
  36                 parent.setLayout(new GridLayout());
  37
  38                 Composite toolBar = new Composite(parent, SWT.NONE);
  39                 toolBar.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
  40                 toolBar.setLayout(new RowLayout());
  41                 Button load = new Button(toolBar, SWT.FLAT);
  42                 load.setText("\u2191");// up arrow
  43                 load.addSelectionListener(new SelectionAdapter() {
  44
  45                         @Override
  46                         public void widgetSelected(SelectionEvent e) {
  47                                 FileDialog fileDialog = new FileDialog(area.getShell());
  48                                 String path = fileDialog.open();
  49                                 if (path != null) {
  50                                         setUrl(path);
  51                                 }
  52                         }
  53
  54                 });
  55
  56                 area = new Canvas(parent, SWT.NONE);
  57                 area.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
  58                 area.addPaintListener(this);
  59         }
  60
  61         protected void load(URL url) {
  62                 try {
  63                         ImageLoader imageLoader = new ImageLoader();
  64                         ImageData[] data = imageLoader.load(url.openStream());
  65                         image = new Image(area.getDisplay(), data[0]);
  66                 } catch (IOException e) {
  67                         // TODO Auto-generated catch block
  68                         e.printStackTrace();
  69                 }
  70         }
  71
  72         @Override
  73         public void paintControl(PaintEvent e) {
  74                 e.gc.drawImage(image, 0, 0);
  75
  76         }
  77
  78         protected Path url2path(URL url) {
  79                 try {
  80                         Path path = Paths.get(url.toURI());
  81                         return path;
  82                 } catch (URISyntaxException e) {
  83                         throw new IllegalStateException("Cannot convert " + url + " to uri", e);
  84                 }
  85         }
  86
  87         public void setUrl(URL url) {
  88                 this.url = url;
  89                 if (area != null)
  90                         load(this.url);
  91         }
  92
  93         public void setUrl(String url) {
  94                 try {
  95                         setUrl(new URL(url));
  96                 } catch (MalformedURLException e) {
  97                         // try with http
  98                         try {
  99                                 setUrl(new URL("file://" + url));
 100                                 return;
 101                         } catch (MalformedURLException e1) {
 102                                 // nevermind...
 103                         }
 104                         throw new IllegalArgumentException("Cannot interpret URL " + url, e);
 105                 }
 106         }
 107
 108         public static void main(String[] args) {
 109                 Display display = Display.getCurrent() == null ? new Display() : Display.getCurrent();
 110                 Shell shell = new Shell(display, SWT.SHELL_TRIM);
 111
 112                 MiniImageViewer miniBrowser = new MiniImageViewer(shell, SWT.NONE);
 113                 String url = args.length > 0 ? args[0] : "";
 114                 if (!url.trim().equals("")) {
 115                         miniBrowser.setUrl(url);
 116                         shell.setText(url);
 117                 } else {
 118                         shell.setText("*");
 119                 }
 120
 121                 shell.open();
 122                 shell.setSize(new Point(800, 480));
 123                 while (!shell.isDisposed()) {
 124                         if (!display.readAndDispatch())
 125                                 display.sleep();
 126                 }
 127         }
 128
 129 }