private void setPreviewScale(float scale) {
preview.setFitVertical(false);
preview.setFitHorizontal(false);
preview.setScale(scale);
rememberScrollingPosition();
updatePreviewSize();
restoreScrollingPosition();
}
/**
* Executes the GridPrint example.
*
* @param args the command line arguments.
*/
public static void main(String[] args) {
final Display display = new Display();
Shell shell = new Shell(display, SWT.SHELL_TRIM);
shell.setText("GridPrintVerticalAlignmentExample.java");
shell.setLayout(new GridLayout());
shell.setSize(600, 800);
final PrintJob job = new PrintJob("GridPrintVerticalAlignmentExample.java", createPrint());
Composite buttonPanel = new Composite(shell, SWT.NONE);
buttonPanel.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
buttonPanel.setLayout(new RowLayout(SWT.HORIZONTAL));
final PrintPreview preview = new PrintPreview(shell, SWT.BORDER);
Button prev = new Button(buttonPanel, SWT.PUSH);
prev.setText("<< Prev");
prev.addListener(
SWT.Selection,
new Listener() {
public void handleEvent(Event event) {
preview.setPageIndex(Math.max(preview.getPageIndex() - 1, 0));
}
});
Button next = new Button(buttonPanel, SWT.PUSH);
next.setText("Next >>");
next.addListener(
SWT.Selection,
new Listener() {
public void handleEvent(Event event) {
preview.setPageIndex(Math.min(preview.getPageIndex() + 1, preview.getPageCount() - 1));
}
});
Button print = new Button(buttonPanel, SWT.PUSH);
print.setText("Print");
print.addListener(
SWT.Selection,
new Listener() {
public void handleEvent(Event event) {
PaperClips.print(job, new PrinterData());
}
});
preview.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
preview.setFitHorizontal(true);
preview.setFitVertical(true);
preview.setPrintJob(job);
shell.open();
while (!shell.isDisposed()) if (!display.readAndDispatch()) display.sleep();
display.dispose();
}
public Control createControl(Composite parent) {
Composite shell = new Composite(parent, SWT.None);
final PrintJob job = new PrintJob("GridPrintVerticalAlignmentExample.java", createPrint());
shell.setLayout(new org.eclipse.swt.layout.GridLayout());
Composite buttonPanel = new Composite(shell, SWT.NONE);
buttonPanel.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
buttonPanel.setLayout(new RowLayout(SWT.HORIZONTAL));
final PrintPreview preview = new PrintPreview(shell, SWT.BORDER);
Button prev = new Button(buttonPanel, SWT.PUSH);
prev.setText("<< Prev");
prev.addListener(
SWT.Selection,
new Listener() {
public void handleEvent(Event event) {
preview.setPageIndex(Math.max(preview.getPageIndex() - 1, 0));
}
});
Button next = new Button(buttonPanel, SWT.PUSH);
next.setText("Next >>");
next.addListener(
SWT.Selection,
new Listener() {
public void handleEvent(Event event) {
preview.setPageIndex(Math.min(preview.getPageIndex() + 1, preview.getPageCount() - 1));
}
});
Button print = new Button(buttonPanel, SWT.PUSH);
print.setText("Print");
print.addListener(
SWT.Selection,
new Listener() {
public void handleEvent(Event event) {
PaperClips.print(job, new PrinterData());
}
});
preview.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
preview.setFitHorizontal(true);
preview.setFitVertical(true);
preview.setPrintJob(job);
return shell;
}
protected void updateJob() {
printJob = new PrintJob("Default Print job", print.createPrinter());
preview.setPrintJob(printJob);
forgetScrollingPosition();
updatePreviewSize();
updatePageNumber();
}
private void restoreScrollingPosition() {
if (scrollingPosition != null) {
Point size = preview.getSize();
scroll.setOrigin(
(int) Math.round(scrollingPosition[0] * size.x),
(int) Math.round(scrollingPosition[1] * size.y));
}
}
private void updatePageNumber() {
int pageIndex = preview.getPageIndex();
int pageCount = preview.getPageCount();
int visiblePageCount = preview.getHorizontalPageCount() * preview.getVerticalPageCount();
String text =
(visiblePageCount > 1
? "Pages "
+ (pageIndex + 1)
+ "-"
+ Math.min(pageCount, pageIndex + visiblePageCount)
: "Page " + (pageIndex + 1))
+ " of "
+ pageCount;
pageNumber.setText(text);
previousPage.setEnabled(pageIndex > 0);
nextPage.setEnabled(pageIndex < pageCount - visiblePageCount);
shell.layout(new Control[] {pageNumber});
}
private void rememberScrollingPosition() {
Point size = preview.getSize();
if (size.x == 0 || size.y == 0) {
forgetScrollingPosition();
} else if (scrollingPosition == null) {
Point origin = scroll.getOrigin();
scrollingPosition =
new double[] {(double) origin.x / (double) size.x, (double) origin.y / (double) size.y};
}
}
private void updatePreviewSize() {
Point minSize;
Rectangle bounds = scroll.getClientArea();
if (preview.isFitHorizontal()) {
if (preview.isFitVertical()) minSize = new Point(0, 0); // Best fit
else minSize = new Point(0, preview.computeSize(bounds.width, SWT.DEFAULT).y); // Fit to width
} else {
if (preview.isFitVertical())
minSize = new Point(preview.computeSize(SWT.DEFAULT, bounds.height).x, 0); // Fit to height
else minSize = preview.computeSize(SWT.DEFAULT, SWT.DEFAULT); // Custom
// scale
}
scroll.setMinSize(minSize);
}
private void setPreviewPageIndex(int pageIndex) {
preview.setPageIndex(Math.max(Math.min(pageIndex, preview.getPageCount() - 1), 0));
updatePageNumber();
}
private Control createScrollingPreview(Composite parent) {
scroll = new ScrolledComposite(parent, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
scroll.setExpandHorizontal(true);
scroll.setExpandVertical(true);
preview = new PrintPreview(scroll, SWT.NONE);
scroll.setContent(preview);
scroll.addListener(
SWT.Resize,
new Listener() {
public void handleEvent(Event event) {
Rectangle bounds = scroll.getClientArea();
scroll.getHorizontalBar().setPageIncrement(bounds.width * 2 / 3);
scroll.getVerticalBar().setPageIncrement(bounds.height * 2 / 3);
if (preview.isFitHorizontal() ^ preview.isFitVertical()) {
rememberScrollingPosition();
updatePreviewSize();
restoreScrollingPosition();
}
}
});
preview.setFitVertical(true);
preview.setFitHorizontal(true);
Listener dragListener =
new Listener() {
private final Point dpi = display.getDPI();
private boolean scrollable = false;
private boolean dragging = false;
private Point dragStartScrollOrigin = null;
private Point dragStartMouseAnchor = null;
public void handleEvent(Event event) {
switch (event.type) {
case SWT.Resize:
forgetScrollingPosition();
Rectangle bounds = scroll.getClientArea();
Point size = preview.getSize();
scrollable = size.x > bounds.width || size.y > bounds.height;
if (!scrollable && dragging) endDragging();
break;
case SWT.MouseDown:
forgetScrollingPosition();
if (scrollable && event.button == 1) beginDragging(event);
break;
case SWT.MouseMove:
if (dragging) {
forgetScrollingPosition();
Point point = preview.toDisplay(event.x, event.y);
scroll.setOrigin(
dragStartScrollOrigin.x + dragStartMouseAnchor.x - point.x,
dragStartScrollOrigin.y + dragStartMouseAnchor.y - point.y);
}
break;
case SWT.MouseUp:
forgetScrollingPosition();
if (dragging) endDragging();
break;
case SWT.MouseEnter:
display.addFilter(SWT.MouseWheel, this);
break;
case SWT.MouseWheel:
if (event.count != 0) {
if (scrollable
&& !dragging
&& (event.stateMask == SWT.NONE || event.stateMask == SWT.SHIFT)) {
forgetScrollingPosition();
bounds = scroll.getClientArea();
size = preview.getSize();
Point origin = scroll.getOrigin();
int direction = event.count > 0 ? -1 : 1;
// Prefer vertical scrolling unless user is
// pressing Shift
if (size.y > bounds.height && event.stateMask == SWT.NONE)
origin.y += direction * Math.min(dpi.y, bounds.height / 4);
else if (size.x > bounds.width)
origin.x += direction * Math.min(dpi.x, bounds.width / 4);
scroll.setOrigin(origin);
event.doit = false;
} else if (event.stateMask == SWT.CTRL) { // Ctrl+MouseWheel
// ->
// zoom
float scale = preview.getAbsoluteScale();
setPreviewScale(event.count > 0 ? scale / 1.1f : scale * 1.1f);
}
}
break;
case SWT.MouseExit:
display.removeFilter(SWT.MouseWheel, this);
break;
}
}
private void beginDragging(Event event) {
dragStartScrollOrigin = scroll.getOrigin();
dragStartMouseAnchor = preview.toDisplay(event.x, event.y);
dragging = true;
}
private void endDragging() {
dragging = false;
dragStartMouseAnchor = null;
dragStartScrollOrigin = null;
}
};
scroll.addListener(SWT.Resize, dragListener);
preview.addListener(SWT.MouseDown, dragListener);
preview.addListener(SWT.MouseMove, dragListener);
preview.addListener(SWT.MouseUp, dragListener);
// These are for mouse wheel handling
preview.addListener(SWT.MouseEnter, dragListener);
preview.addListener(SWT.MouseExit, dragListener);
return scroll;
}