--- /dev/null
+/*
+ * Jexer - Java Text User Interface
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (C) 2019 Kevin Lamonte
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * @author Kevin Lamonte [kevin.lamonte@gmail.com]
+ * @version 1
+ */
+package jexer.bits;
+
+import java.awt.Image;
+import java.awt.Toolkit;
+import java.awt.datatransfer.DataFlavor;
+import java.awt.datatransfer.StringSelection;
+import java.awt.datatransfer.Transferable;
+import java.awt.datatransfer.UnsupportedFlavorException;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+
+/**
+ * Clipboard provides convenience methods to copy text and images to and from
+ * a shared clipboard. When the system clipboard is available it is used.
+ */
+public class Clipboard {
+
+ // ------------------------------------------------------------------------
+ // Variables --------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * The image last copied to the clipboard.
+ */
+ private BufferedImage image = null;
+
+ /**
+ * The text string last copied to the clipboard.
+ */
+ private String text = null;
+
+ /**
+ * The system clipboard, or null if it is not available.
+ */
+ private java.awt.datatransfer.Clipboard systemClipboard = null;
+
+ /**
+ * The image selection class.
+ */
+ private ImageSelection imageSelection;
+
+ /**
+ * ImageSelection is used to hold an image while on the clipboard.
+ */
+ private class ImageSelection implements Transferable {
+
+ /**
+ * Returns an array of DataFlavor objects indicating the flavors the
+ * data can be provided in. The array should be ordered according to
+ * preference for providing the data (from most richly descriptive to
+ * least descriptive).
+ *
+ * @return an array of data flavors in which this data can be
+ * transferred
+ */
+ public DataFlavor[] getTransferDataFlavors() {
+ return new DataFlavor[] { DataFlavor.imageFlavor };
+ }
+
+ /**
+ * Returns whether or not the specified data flavor is supported for
+ * this object.
+ *
+ * @param flavor the requested flavor for the data
+ * @return boolean indicating whether or not the data flavor is
+ * supported
+ */
+ public boolean isDataFlavorSupported(DataFlavor flavor) {
+ return DataFlavor.imageFlavor.equals(flavor);
+ }
+
+ /**
+ * Returns an object which represents the data to be transferred. The
+ * class of the object returned is defined by the representation
+ * class of the flavor.
+ *
+ * @param flavor the requested flavor for the data
+ * @throws IOException if the data is no longer available in the
+ * requested flavor.
+ * @throws UnsupportedFlavorException if the requested data flavor is
+ * not supported.
+ */
+ public Object getTransferData(DataFlavor flavor)
+ throws UnsupportedFlavorException, IOException {
+
+ if (!DataFlavor.imageFlavor.equals(flavor)) {
+ throw new UnsupportedFlavorException(flavor);
+ }
+ return image;
+ }
+ }
+
+ // ------------------------------------------------------------------------
+ // Constructors -----------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Public constructor.
+ */
+ public Clipboard() {
+ try {
+ systemClipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
+ } catch (java.awt.HeadlessException e) {
+ // SQUASH
+ }
+ }
+
+ // ------------------------------------------------------------------------
+ // Clipboard --------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * Copy an image to the clipboard.
+ *
+ * @param image image to copy
+ */
+ public void copyImage(final BufferedImage image) {
+ this.image = image;
+ if (systemClipboard != null) {
+ ImageSelection imageSelection = new ImageSelection();
+ systemClipboard.setContents(imageSelection, null);
+ }
+ }
+
+ /**
+ * Copy a text string to the clipboard.
+ *
+ * @param text string to copy
+ */
+ public void copyText(final String text) {
+ this.text = text;
+ if (systemClipboard != null) {
+ StringSelection stringSelection = new StringSelection(text);
+ systemClipboard.setContents(stringSelection, null);
+ }
+ }
+
+ /**
+ * Obtain an image from the clipboard.
+ *
+ * @return image from the clipboard, or null if no image is available
+ */
+ public BufferedImage pasteImage() {
+ if (systemClipboard != null) {
+ getClipboardImage();
+ }
+ return image;
+ }
+
+ /**
+ * Obtain a text string from the clipboard.
+ *
+ * @return text string from the clipboard, or null if no text is
+ * available
+ */
+ public String pasteText() {
+ if (systemClipboard != null) {
+ getClipboardText();
+ }
+ return text;
+ }
+
+ /**
+ * Returns true if the clipboard has an image.
+ *
+ * @return true if an image is available from the clipboard
+ */
+ public boolean isImage() {
+ if (image == null) {
+ getClipboardImage();
+ }
+ return (image != null);
+ }
+
+ /**
+ * Returns true if the clipboard has a text string.
+ *
+ * @return true if a text string is available from the clipboard
+ */
+ public boolean isText() {
+ if (text == null) {
+ getClipboardText();
+ }
+ return (text != null);
+ }
+
+ /**
+ * Returns true if the clipboard is empty.
+ *
+ * @return true if the clipboard is empty
+ */
+ public boolean isEmpty() {
+ return ((isText() == false) && (isImage() == false));
+ }
+
+ /**
+ * Copy image from the clipboard to text.
+ */
+ private void getClipboardImage() {
+ if (systemClipboard != null) {
+ Transferable contents = systemClipboard.getContents(null);
+ if (contents != null) {
+ if (contents.isDataFlavorSupported(DataFlavor.imageFlavor)) {
+ try {
+ Image img = (Image) contents.getTransferData(DataFlavor.imageFlavor);
+ image = new BufferedImage(img.getWidth(null),
+ img.getHeight(null), BufferedImage.TYPE_INT_ARGB);
+ image.getGraphics().drawImage(img, 0, 0, null);
+ } catch (IOException e) {
+ // SQUASH
+ } catch (UnsupportedFlavorException e) {
+ // SQUASH
+ }
+ }
+ }
+ }
+ }
+
+ /**
+ * Copy text string from the clipboard to text.
+ */
+ private void getClipboardText() {
+ if (systemClipboard != null) {
+ Transferable contents = systemClipboard.getContents(null);
+ if (contents != null) {
+ if (contents.isDataFlavorSupported(DataFlavor.stringFlavor)) {
+ try {
+ text = (String) contents.getTransferData(DataFlavor.stringFlavor);
+ } catch (IOException e) {
+ // SQUASH
+ } catch (UnsupportedFlavorException e) {
+ // SQUASH
+ }
+ }
+ }
+ }
+ }
+
+ /**
+ * Clear whatever is on the local clipboard. Note that this will not
+ * clear the system clipboard.
+ */
+ public void clear() {
+ image = null;
+ text = null;
+ }
+
+}
git://git.nikiroo.be / fanfix.git / blobdiff