[platform-swt-dev] Printing a composite widget

[Jörgen Ekström <jorgen.ekstrom@xxxxxxxxxxxx>]

Hi All,

 

Can someone help me how to print a composite and hence utilize the layout capabilities in swt?

In the printing examples I’ve looked at, a GC is created and all “layout” is handled manually. I have a

number of charts which are layout using GridLayout which I would like to print as they appear on screen.

 

I tried the following code (see below) but got a Thread Access Error when creating the Display. The Action is a simple

menu action called within the UI thread.

 

I would appreciate any help or hints! Thanks!

 

Jorgen E.

 

 

            ChartWindow chartWindow = (ChartWindow)window;

            int nbrPages = chartWindow.getNbrTabs();

           

            PrintDialog dialog = new PrintDialog(window.getShell(), SWT.NONE);

            dialog.setText("PrintDialogDemo");

            dialog.setScope(PrinterData.PAGE_RANGE);

            dialog.setStartPage(1);

            dialog.setEndPage(nbrPages);

            dialog.setPrintToFile(true);

            PrinterData printerData = dialog.open();

            if (printerData != null) {

           

                  Printer printer = new Printer(printerData);

                  //GC gc = new GC(printer);

                  DeviceData deviceData = printer.getDeviceData();

                  Display display = new Display(deviceData);

                 

                  printer.startJob("Chart");

 

                  printer.startPage();

                  Shell shell = new Shell(display);

 

                  ChartResources chartResources = new ChartResources(shell);

                 

                  int itemId[] = chartWindow.getItemId();

                 

                  GridLayout layout = new GridLayout();

                  layout.numColumns = 3;

                  layout.makeColumnsEqualWidth = true;

                  shell.setLayout(layout);

           

                  for (int i = 0; i < ItemId.length; i++) {

                        Chart chart = ChartKit.getChart(itemId[i], false, env);

                        ChartCanvas canvas = new ChartCanvas(chart, chartResources, shell, SWT.BORDER);

                        canvas.setLayoutData(new GridData(GridData.FILL_BOTH));

                  }

 

                  printer.endPage();

                  printer.endJob();

                 

                  printer.dispose();

            }

      }

 

 

org.eclipse.swt.SWTException: Invalid thread access

      at org.eclipse.swt.SWT.error(SWT.java:2691)

      at org.eclipse.swt.SWT.error(SWT.java:2616)

      at org.eclipse.swt.SWT.error(SWT.java:2587)

      at org.eclipse.swt.widgets.Display.checkDisplay(Display.java:568)

      at org.eclipse.swt.widgets.Display.create(Display.java:629)

      at org.eclipse.swt.graphics.Device.<init>(Device.java:99)

      at org.eclipse.swt.widgets.Display.<init>(Display.java:355)

      at com.finsys.tradeagent.chart.PrintAction.run(PrintAction.java:63)

      at org.eclipse.jface.action.Action.runWithEvent(Action.java:881)

      at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:915)

      at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:866)

      at org.eclipse.jface.action.ActionContributionItem$7.handleEvent(ActionContributionItem.java:785)

      at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:82)

      at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:796)

      at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2772)

      at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2431)

      at org.eclipse.jface.window.Window.runEventLoop(Window.java:668)

      at org.eclipse.jface.window.Window.open(Window.java:648)

      at com.finsys.tradeagent.TradeAgentWindow.main(TradeAgentWindow.java:132)