PageLayoutInputFieldController.java

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package viewer.printing;

import javafx.print.PageLayout;
import javafx.print.PrinterJob;
import javafx.scene.control.Alert;
import javafx.scene.text.Text;

/**
 * Controller class for the input fields to configure the PageLayout of the PrinterJob.
 */
public class PageLayoutInputFieldController {

  // labels that display the current settings for the PageLayout
  public Text paperSizeLabel;
  public Text paperOrientationLabel;
  public Text paperMarginsTopLabel;
  public Text paperMarginsRightLabel;
  public Text paperMarginsBottomLabel;
  public Text paperMarginsLeftLabel;

  private PrinterJob job;

  /**
   * A simple mutex to prohibit multiple page setup dialogs from showing simultaneously
   */
  private boolean isPageSetupDialogShowing = false;

  /**
   * Brings up the page setup dialog in which the user can choose the paper settings for the printing.
   * The values are displayed on the left side of the application.
   */
  public void showPageSetupDialog() {
    if (job != null) {
      if (!isPageSetupDialogShowing) {
        isPageSetupDialogShowing = true;
        try {
          if (job.showPageSetupDialog(paperSizeLabel.getScene().getWindow())) {
            updateTextFields();
          }
        }
        catch (Exception ex) {
          Alert alert = new Alert(Alert.AlertType.WARNING);
          alert.setTitle("Invalid Margins");
          alert.setHeaderText("Margins must be larger than zero.");
          alert.setContentText("Zero margins are not allowed. The margins have been reset to their former values.");
          alert.show();
        }
        finally {
          isPageSetupDialogShowing = false;
        }
      }
    }
  }

  /**
   * Updates the values in the view that displays the values of the current set PageLayout.
   */
  public void updateTextFields() {
    if (job != null) {
      PageLayout newPageLayout = job.getJobSettings().getPageLayout();
      paperSizeLabel.setText(newPageLayout.getPaper().getName());
      paperOrientationLabel.setText(newPageLayout.getPageOrientation().name());
      paperMarginsTopLabel.setText((int) newPageLayout.getTopMargin() + "");
      paperMarginsRightLabel.setText((int) newPageLayout.getRightMargin() + "");
      paperMarginsBottomLabel.setText((int) newPageLayout.getBottomMargin() + "");
      paperMarginsLeftLabel.setText((int) newPageLayout.getLeftMargin() + "");
    }
  }

  /**
   * Returns the PrinterJob that is being configured by this instance.
   */
  public PrinterJob getJob() {
    return job;
  }

  /**
   * Sets the PrinterJob that is being configured by this instance.
   */
  public void setJob(final PrinterJob job) {
    this.job = job;
  }
}