ServiceUI.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * accompanied this code).
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package javax.print;

import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Rectangle;
import java.awt.Window;

import javax.print.attribute.Attribute;
import javax.print.attribute.AttributeSet;
import javax.print.attribute.standard.DialogOwner;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.Destination;
import javax.print.attribute.standard.Fidelity;

import sun.print.ServiceDialog;
import sun.print.SunAlternateMedia;

/**
 * This class is a collection of UI convenience methods which provide a
 * graphical user dialog for browsing print services looked up through the Java
 * Print Service API.
 * <p>
 * The dialogs follow a standard pattern of acting as a continue/cancel option
 * for a user as well as allowing the user to select the print service to use
 * and specify choices such as paper size and number of copies.
 * <p>
 * The dialogs are designed to work with pluggable print services though the
 * public APIs of those print services.
 * <p>
 * If a print service provides any vendor extensions these may be made
 * accessible to the user through a vendor supplied tab panel {@code Component}.
 * Such a vendor extension is encouraged to use Swing! and to support its
 * accessibility APIs. The vendor extensions should return the settings as part
 * of the {@code AttributeSet}. Applications which want to preserve the user
 * settings should use those settings to specify the print job. Note that this
 * class is not referenced by any other part of the Java Print Service and may
 * not be included in profiles which cannot depend on the presence of the AWT
 * packages.
 */
public class ServiceUI {

    /**
     * Constructs a {@code ServiceUI}.
     */
    public ServiceUI() {}

    /**
     * Presents a dialog to the user for selecting a print service (printer). It
     * is displayed at the location specified by the application and is modal.
     * If the specification is invalid or would make the dialog not visible it
     * will be displayed at a location determined by the implementation. The
     * dialog blocks its calling thread and is application modal.
     * <p>
     * The dialog may include a tab panel with custom UI lazily obtained from
     * the {@code PrintService}'s {@code ServiceUIFactory} when the
     * {@code PrintService} is browsed. The dialog will attempt to locate a
     * {@code MAIN_UIROLE} first as a {@code JComponent}, then as a
     * {@code Panel}. If there is no {@code ServiceUIFactory} or no matching
     * role the custom tab will be empty or not visible.
     * <p>
     * The dialog returns the print service selected by the user if the user
     * OK's the dialog and {@code null} if the user cancels the dialog.
     * <p>
     * An application must pass in an array of print services to browse. The
     * array must be {@code non-null} and non-empty. Typically an application
     * will pass in only {@code PrintServices} capable of printing a particular
     * document flavor.
     * <p>
     * An application may pass in a {@code PrintService} to be initially
     * displayed. A {@code non-null} parameter must be included in the array of
     * browsable services. If this parameter is {@code null} a service is chosen
     * by the implementation.
     * <p>
     * An application may optionally pass in the flavor to be printed. If this
     * is {@code non-null} choices presented to the user can be better validated
     * against those supported by the services. An application must pass in a
     * {@code PrintRequestAttributeSet} for returning user choices. On calling
     * the {@code PrintRequestAttributeSet} may be empty, or may contain
     * application-specified values.
     * <p>
     * These are used to set the initial settings for the initially displayed
     * print service. Values which are not supported by the print service are
     * ignored. As the user browses print services, attributes and values are
     * copied to the new display. If a user browses a print service which does
     * not support a particular attribute-value, the default for that service is
     * used as the new value to be copied.
     * <p>
     * If the user cancels the dialog, the returned attributes will not reflect
     * any changes made by the user.
     * <p>
     * A typical basic usage of this method may be:
     * <pre>{@code
     * PrintService[] services = PrintServiceLookup.lookupPrintServices(
     *                            DocFlavor.INPUT_STREAM.JPEG, null);
     * PrintRequestAttributeSet attributes = new HashPrintRequestAttributeSet();
     * if (services.length > 0) {
     *    PrintService service =  ServiceUI.printDialog(null, 50, 50,
     *                                               services, services[0],
     *                                               null,
     *                                               attributes);
     *    if (service != null) {
     *     ... print ...
     *    }
     * }
     * }</pre>
     *
     * @param  gc used to select screen, {@code null} means primary or default
     *         screen
     * @param  x location of dialog including border in screen coordinates
     *         relative to the origin of {@code gc}
     * @param  y location of dialog including border in screen coordinates
     *         relative to the origin of {@code gc}
     * @param  services to be browsable, must be {@code non-null}
     * @param  defaultService initial {@code PrintService} to display
     * @param  flavor the flavor to be printed, or {@code null}
     * @param  attributes on input is the initial application supplied
     *         preferences. This cannot be {@code null} but may be empty. On
     *         output the attributes reflect changes made by the user.
     * @return print service selected by the user, or {@code null} if the user
     *         cancelled the dialog
     * @throws HeadlessException if {@code GraphicsEnvironment.isHeadless()}
     *         returns {@code true}
     * @throws IllegalArgumentException if services is {@code null} or empty, or
     *         attributes is {@code null}, or the initial {@code PrintService}
     *         is not in the list of browsable services
     */
    @SuppressWarnings("deprecation")
    public static PrintService printDialog(GraphicsConfiguration gc,
                                           int x, int y,
                                           PrintService[] services,
                                           PrintService defaultService,
                                           DocFlavor flavor,
                                           PrintRequestAttributeSet attributes)
        throws HeadlessException
    {
        int defaultIndex = -1;

        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        } else if ((services == null) || (services.length == 0)) {
            throw new IllegalArgumentException("services must be non-null " +
                                               "and non-empty");
        } else if (attributes == null) {
            throw new IllegalArgumentException("attributes must be non-null");
        }

        if (defaultService != null) {
            for (int i = 0; i < services.length; i++) {
                if (services[i].equals(defaultService)) {
                    defaultIndex = i;
                    break;
                }
            }

            if (defaultIndex < 0) {
                throw new IllegalArgumentException("services must contain " +
                                                   "defaultService");
            }
        } else {
            defaultIndex = 0;
        }

        DialogOwner dlgOwner = (DialogOwner)attributes.get(DialogOwner.class);
        Window owner = (dlgOwner != null) ? dlgOwner.getOwner() : null;
        boolean setOnTop = (dlgOwner != null) && (owner == null);

        Rectangle gcBounds = (gc == null) ?  GraphicsEnvironment.
            getLocalGraphicsEnvironment().getDefaultScreenDevice().
            getDefaultConfiguration().getBounds() : gc.getBounds();

        x += gcBounds.x;
        y += gcBounds.y;
        ServiceDialog dialog = new ServiceDialog(gc,
                                                 x,
                                                 y,
                                                 services, defaultIndex,
                                                 flavor, attributes,
                                                 owner);
        if (setOnTop) {
            try {
                dialog.setAlwaysOnTop(true);
            } catch (SecurityException e) {
            }
        }
        Rectangle dlgBounds = dialog.getBounds();

        // if portion of dialog is not within the gc boundary
        if (!gcBounds.contains(dlgBounds)) {
            // check if dialog exceed window bounds at left or bottom
            // Then position the dialog by moving it by the amount it exceeds
            // the window bounds
            // If it results in dialog moving beyond the window bounds at
            // top/left then position it at window top/left
            if (dlgBounds.x + dlgBounds.width > gcBounds.x + gcBounds.width) {
                if ((gcBounds.x + gcBounds.width - dlgBounds.width) > gcBounds.x) {
                    x = (gcBounds.x + gcBounds.width) - dlgBounds.width;
                } else {
                    x = gcBounds.x;
                }
            }
            if (dlgBounds.y + dlgBounds.height > gcBounds.y + gcBounds.height) {
                if ((gcBounds.y + gcBounds.height - dlgBounds.height) > gcBounds.y) {
                    y = (gcBounds.y + gcBounds.height) - dlgBounds.height;
                } else {
                    y = gcBounds.y;
                }
            }
            dialog.setBounds(x, y, dlgBounds.width, dlgBounds.height);
        }
        dialog.show();

        if (dialog.getStatus() == ServiceDialog.APPROVE) {
            PrintRequestAttributeSet newas = dialog.getAttributes();
            Class<?> dstCategory = Destination.class;
            Class<?> amCategory = SunAlternateMedia.class;
            Class<?> fdCategory = Fidelity.class;

            if (attributes.containsKey(dstCategory) &&
                !newas.containsKey(dstCategory))
            {
                attributes.remove(dstCategory);
            }

            if (attributes.containsKey(amCategory) &&
                !newas.containsKey(amCategory))
            {
                attributes.remove(amCategory);
            }

            attributes.addAll(newas);

            Fidelity fd = (Fidelity)attributes.get(fdCategory);
            if (fd != null) {
                if (fd == Fidelity.FIDELITY_TRUE) {
                    removeUnsupportedAttributes(dialog.getPrintService(),
                                                flavor, attributes);
                }
            }
        }

        return dialog.getPrintService();
    }

    /**
     * POSSIBLE FUTURE API: This method may be used down the road if we
     * decide to allow developers to explicitly display a "page setup" dialog.
     * Currently we use that functionality internally for the AWT print model.
     */
    /*
    public static void pageDialog(GraphicsConfiguration gc,
                                  int x, int y,
                                  PrintService service,
                                  DocFlavor flavor,
                                  PrintRequestAttributeSet attributes)
        throws HeadlessException
    {
        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        } else if (service == null) {
            throw new IllegalArgumentException("service must be non-null");
        } else if (attributes == null) {
            throw new IllegalArgumentException("attributes must be non-null");
        }

        ServiceDialog dialog = new ServiceDialog(gc, x, y, service,
                                                 flavor, attributes);
        dialog.show();

        if (dialog.getStatus() == ServiceDialog.APPROVE) {
            PrintRequestAttributeSet newas = dialog.getAttributes();
            Class amCategory = SunAlternateMedia.class;

            if (attributes.containsKey(amCategory) &&
                !newas.containsKey(amCategory))
            {
                attributes.remove(amCategory);
            }

            attributes.addAll(newas.values());
        }

        dialog.getOwner().dispose();
    }
    */

    /**
     * Removes any attributes from the given {@code AttributeSet} that are
     * unsupported by the given {@code PrintService/DocFlavor} combination.
     */
    private static void removeUnsupportedAttributes(PrintService ps,
                                                    DocFlavor flavor,
                                                    AttributeSet aset)
    {
        AttributeSet asUnsupported = ps.getUnsupportedAttributes(flavor,
                                                                 aset);

        if (asUnsupported != null) {
            Attribute[] usAttrs = asUnsupported.toArray();

            for (int i=0; i<usAttrs.length; i++) {
                Class<? extends Attribute> category = usAttrs[i].getCategory();

                if (ps.isAttributeCategorySupported(category)) {
                    Attribute attr =
                        (Attribute)ps.getDefaultAttributeValue(category);

                    if (attr != null) {
                        aset.add(attr);
                    } else {
                        aset.remove(category);
                    }
                } else {
                    aset.remove(category);
                }
            }
        }
    }
}