/**
* Translate the transfer type from this element.
*
* @param name The attribute name.
* @return The transfer instance.
*/
private Transfer parseTransferType(String name) {
if ("TextTransfer".equals(name)) { // $NON-NLS-1$
return TextTransfer.getInstance();
}
if ("ImageTransfer".equals(name)) { // $NON-NLS-1$
return ImageTransfer.getInstance();
}
if ("FileTransfer".equals(name)) { // $NON-NLS-1$
return FileTransfer.getInstance();
}
if ("LocalSelectionTransfer".equals(name)) { // $NON-NLS-1$
return LocalSelectionTransfer.getTransfer();
}
return null;
}
public ImageViewer(Composite parent, int style) {
super(parent, style);
GridLayout gl = new GridLayout(1, false);
gl.horizontalSpacing = 0;
gl.verticalSpacing = 0;
gl.marginHeight = 0;
gl.marginWidth = 0;
setLayout(gl);
canvas = new ImageViewCanvas(this, SWT.NONE);
canvas.setLayoutData(new GridData(GridData.FILL_BOTH));
// Add DND support
Transfer[] types = new Transfer[] {ImageTransfer.getInstance()};
int operations = DND.DROP_COPY;
final DragSource source = new DragSource(canvas, operations);
source.setTransfer(types);
source.addDragListener(
new DragSourceListener() {
@Override
public void dragStart(DragSourceEvent event) {}
@Override
public void dragSetData(DragSourceEvent event) {
if (canvas.getImageData() != null) {
event.data = canvas.getImageData();
} else {
event.data = null;
}
}
@Override
public void dragFinished(DragSourceEvent event) {}
});
}
public static void main(String[] args) {
final Display display = new Display();
final Clipboard clipboard = new Clipboard(display);
final Shell shell = new Shell(display, SWT.SHELL_TRIM);
shell.setLayout(new GridLayout());
shell.setText("Clipboard ImageTransfer");
final Button imageButton = new Button(shell, SWT.NONE);
GridData gd = new GridData(SWT.FILL, SWT.FILL, true, true);
gd.minimumHeight = 400;
gd.minimumWidth = 600;
imageButton.setLayoutData(gd);
final Text imageText = new Text(shell, SWT.BORDER);
imageText.setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false));
Composite buttons = new Composite(shell, SWT.NONE);
buttons.setLayout(new GridLayout(4, true));
Button button = new Button(buttons, SWT.PUSH);
button.setText("Open");
button.addListener(
SWT.Selection,
event -> {
FileDialog dialog = new FileDialog(shell, SWT.OPEN);
dialog.setText("Open an image file or cancel");
String string = dialog.open();
if (string != null) {
imageButton.setText("");
Image image = imageButton.getImage();
if (image != null) image.dispose();
image = new Image(display, string);
imageButton.setImage(image);
imageText.setText(string);
}
});
button = new Button(buttons, SWT.PUSH);
button.setText("Copy");
button.addListener(
SWT.Selection,
event -> {
Image image = imageButton.getImage();
if (image != null) {
ImageTransfer imageTransfer = ImageTransfer.getInstance();
TextTransfer textTransfer = TextTransfer.getInstance();
clipboard.setContents(
new Object[] {image.getImageData(), imageText.getText()},
new Transfer[] {imageTransfer, textTransfer});
}
});
button = new Button(buttons, SWT.PUSH);
button.setText("Paste");
button.addListener(
SWT.Selection,
event -> {
ImageData imageData = (ImageData) clipboard.getContents(ImageTransfer.getInstance());
if (imageData != null) {
imageButton.setText("");
Image image = imageButton.getImage();
if (image != null) image.dispose();
image = new Image(display, imageData);
imageButton.setImage(image);
} else {
imageButton.setText("No image");
imageButton.setImage(null);
}
String text = (String) clipboard.getContents(TextTransfer.getInstance());
if (text != null) {
imageText.setText(text);
} else {
imageText.setText("");
}
});
button = new Button(buttons, SWT.PUSH);
button.setText("Clear");
button.addListener(
SWT.Selection,
event -> {
imageButton.setText("");
Image image = imageButton.getImage();
if (image != null) image.dispose();
imageButton.setImage(null);
imageText.setText("");
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}