source: trunk/src/org/expeditee/io/ItemSelection.java@ 652

package org.expeditee.io;


import java.awt.Image;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Arrays;
import java.util.List;

import javax.imageio.ImageIO;

import org.expeditee.gui.DisplayIO;
import org.expeditee.gui.FrameGraphics;
import org.expeditee.gui.FrameIO;
import org.expeditee.gui.FrameMouseActions;
import org.expeditee.gui.FreeItems;
import org.expeditee.gui.MessageBay;
import org.expeditee.items.Item;
import org.expeditee.items.ItemUtils;
import org.expeditee.items.Picture;
import org.expeditee.items.StringUtils;
import org.expeditee.items.Text;

/**
 * Allows item data (text) and metadata (position, shapes, etc) to be stored on the clipboard
 * 
 * @author jts21
 */
public class ItemSelection implements Transferable {
        
        /**
         * Class used for storing data which can be used to reconstruct expeditee objects from the clipboard
         * Stores data as a String containing .exp save data
         */
        public static final class ExpDataHandler implements Serializable {
                
                private static final long serialVersionUID = 1L;
                
                // exp save data
                public String items;
        }
        
        public static final DataFlavor expDataFlavor = new DataFlavor(ExpDataHandler.class, "expDataHandler");
        
        private static final int STRING = 0;
    private static final int IMAGE = 1;
    private static final int EXP_DATA = 2;
        
        private static final DataFlavor[] flavors = {
        DataFlavor.stringFlavor,
        DataFlavor.imageFlavor,
        expDataFlavor
    };
        
        private String data;
        private Image image;
        private ExpDataHandler expData;
        
        public ItemSelection(String data, Image image, ExpDataHandler expData) {
        this.data = data;
        this.image = image;
        this.expData = expData;
    }
        
        @Override
        public DataFlavor[] getTransferDataFlavors() {
                return (DataFlavor[])flavors.clone();
        }

        @Override
        public boolean isDataFlavorSupported(DataFlavor flavor) {
                for (int i = 0; i < flavors.length; i++) {
            if (flavor.equals(flavors[i])) {
                return true;
            }
        }
        return false;
        }

        @Override
        public Object getTransferData(DataFlavor flavor)
                        throws UnsupportedFlavorException, IOException {
        if (flavor.equals(flavors[STRING])) {
            return (Object)data;
        } else if (flavor.equals(flavors[IMAGE])) {
                return (Object)image;
        } else if (flavor.equals(flavors[EXP_DATA])) {
            return (Object)expData;
        } else {
            throw new UnsupportedFlavorException(flavor);
        }
        }
        
        
        public static void cut(List<Item> items) {
                
                copy(items);
                
                // remove the items attached to the cursor
                items.clear();
                
                FrameGraphics.refresh(false);
        }
        
        public static void copyClone(List<Item> items) {
                
                copy(ItemUtils.CopyItems(items));
                
        }
        
        /**
         * Copies whatever items are attached to the mouse to the clipboard
         */
        private static void copy(List<Item> items) {
                if(items.size() <= 0) {
                        return;
                }
                
                StringBuilder clipboardText = new StringBuilder();
                ExpDataHandler expData = new ExpDataHandler();
                Image image = null;
                
                // get plaintext
                for(Item i : items) {
                        if(i instanceof Text) {
                                clipboardText.append(((Text)i).getText());
                                clipboardText.append("\n\n");
                        }
                        if(i instanceof Picture) {
                                // TODO: merge multiple images if necessary
                                image = ((Picture)i).getImage();
                        }
                }
                
                // get expeditee item data
                ExpClipWriter ecw = new ExpClipWriter(FrameMouseActions.getX(), FrameMouseActions.getY());
                try {
                        ecw.output(items);
                } catch (IOException e1) {
                        e1.printStackTrace();
                }
                expData.items = ecw.getFileContents();
                // System.out.println(expData.items); 
                
                // write out to clipboard
                ItemSelection selection = new ItemSelection(clipboardText.toString(), image, expData);
                Toolkit.getDefaultToolkit().getSystemClipboard().setContents(selection, null);
        }
        
        /**
         * Generates items from the clipboard data
         *  TODO: Enable pasting raw image data (would require saving the data as an image file and generating a Text item pointing to it)
         */
        public static void paste() {
                if(FreeItems.itemsAttachedToCursor()) {
                        MessageBay.displayMessage("Drop any items being carried on the cursor, then try pasting again");
                        return;
                }
                String type = "";
                FreeItems f = FreeItems.getInstance();
                Clipboard c = Toolkit.getDefaultToolkit().getSystemClipboard();
                Transferable content = c.getContents(null);
                try {
                        if(content.isDataFlavorSupported(ItemSelection.expDataFlavor)) {        // Expeditee data
                                type = "Expeditee ";
                                ExpDataHandler expData = (ExpDataHandler)content.getTransferData(ItemSelection.expDataFlavor);
                                if(expData != null) {
                                        List<Item> items = new ExpClipReader(FrameMouseActions.getX(), FrameMouseActions.getY()).read(expData.items);
                                        // generate new IDs and pickup
                                        FrameMouseActions.pickup(ItemUtils.CopyItems(items));
                                }
                        } else if(content.isDataFlavorSupported(DataFlavor.imageFlavor)) {      // Image data
                                // System.out.println("IZ PIKTUR");
                                type = "Image ";
                                BufferedImage img = (BufferedImage)content.getTransferData(DataFlavor.imageFlavor);
                                int hashcode = Arrays.hashCode(img.getData().getPixels(0, 0, img.getWidth(), img.getHeight(), (int[])null));
                                File out = new File(FrameIO.IMAGES_PATH + Integer.toHexString(hashcode) + ".png");
                                out.mkdirs();
                                ImageIO.write(img, "png", out);
                                Text item = DisplayIO.getCurrentFrame().createNewText("@i: " + out.getPath());
                                f.add(item);
                                ExpClipReader.updateItems(f);
                        } else if(content.isDataFlavorSupported(DataFlavor.stringFlavor)) {     // Plain text
                                type = "Plain Text ";
                                String clip = ((String) content.getTransferData(DataFlavor.stringFlavor));
                                // Covert the line separator char when pasting in
                                // windows (\r\n) or max (\r)
                                clip = StringUtils.convertNewLineChars(clip);
                                // blank line is an item separator
                                String[] items = clip.split("\n\n");
                                Item item, prevItem = null;
                                for(int i = 0; i < items.length; i++) {
                                        // System.out.println(items[i]);
                                        // System.out.println("Created item from string");
                                        item = DisplayIO.getCurrentFrame().createNewText(items[i]);
                                        if(prevItem != null){
                                                item.setY(prevItem.getY() + prevItem.getBoundsHeight());
                                        }
                                        f.add(item);
                                        prevItem = item;
                                }
                        } /* else if {
                                // Next handler
                        } */
                } catch (Exception e) {
                        System.out.println("Failed to load " + type + "data");
                        e.printStackTrace();
                }
        }

}