1 package org.argeo.swt.desktop;
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");
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
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
98 try {
99 setUrl(new URL("file://" + url));
100 return;
101 } catch (MalformedURLException e1) {
102
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 }