--- /dev/null
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import javax.imageio.ImageIO;
+
+import jexer.TAction;
+import jexer.TApplication;
+import jexer.TDesktop;
+import jexer.TDirectoryList;
+import jexer.TImage;
+import jexer.backend.SwingTerminal;
+import jexer.bits.CellAttributes;
+import jexer.bits.GraphicsChars;
+import jexer.event.TKeypressEvent;
+import jexer.event.TResizeEvent;
+import jexer.menu.TMenu;
+import jexer.ttree.TDirectoryTreeItem;
+import jexer.ttree.TTreeItem;
+import jexer.ttree.TTreeViewWidget;
+import static jexer.TKeypress.*;
+
+/**
+ * Implements a simple image thumbnail file viewer. Much of this code was
+ * stripped down from TFileOpenBox.
+ */
+public class JexerImageViewer extends TApplication {
+
+ /**
+ * Main entry point.
+ */
+ public static void main(String [] args) throws Exception {
+ // For this application, we must use ptypipe so that the tile shells
+ // can be aware of their size.
+
+ JexerImageViewer app = new JexerImageViewer();
+ (new Thread(app)).start();
+ }
+
+ /**
+ * Public constructor chooses the ECMA-48 / Xterm backend.
+ */
+ public JexerImageViewer() throws Exception {
+ super(BackendType.XTERM);
+
+ // The stock tool menu has items for redrawing the screen, opening
+ // images, and (when using the Swing backend) setting the font.
+ addToolMenu();
+
+ // We will have one menu containing a mix of new and stock commands
+ TMenu fileMenu = addMenu("&File");
+
+ // Stock commands: a new shell, exit program.
+ fileMenu.addDefaultItem(TMenu.MID_SHELL);
+ fileMenu.addSeparator();
+ fileMenu.addDefaultItem(TMenu.MID_EXIT);
+
+ // Filter the files list to support image suffixes only.
+ List<String> filters = new ArrayList<String>();
+ filters.add("^.*\\.[Jj][Pp][Gg]$");
+ filters.add("^.*\\.[Jj][Pp][Ee][Gg]$");
+ filters.add("^.*\\.[Pp][Nn][Gg]$");
+ filters.add("^.*\\.[Gg][Ii][Ff]$");
+ filters.add("^.*\\.[Bb][Mm][Pp]$");
+ setDesktop(new ImageViewerDesktop(this, ".", filters));
+ }
+
+}
+
+/**
+ * The desktop contains a tree view on the left, list of files on the top
+ * right, and image view on the bottom right.
+ */
+class ImageViewerDesktop extends TDesktop {
+
+ /**
+ * The left-side tree view pane.
+ */
+ private TTreeViewWidget treeView;
+
+ /**
+ * The data behind treeView.
+ */
+ private TDirectoryTreeItem treeViewRoot;
+
+ /**
+ * The top-right-side directory list pane.
+ */
+ private TDirectoryList directoryList;
+
+ /**
+ * The bottom-right-side image pane.
+ */
+ private TImage imageWidget;
+
+ /**
+ * Public constructor.
+ *
+ * @param application the TApplication that manages this window
+ * @param path path of selected file
+ * @param filters a list of strings that files must match to be displayed
+ * @throws IOException of a java.io operation throws
+ */
+ public ImageViewerDesktop(final TApplication application, final String path,
+ final List<String> filters) throws IOException {
+
+ super(application);
+ setActive(true);
+
+ // Add directory treeView
+ treeView = addTreeViewWidget(0, 0, getWidth() / 2, getHeight() - 1,
+ new TAction() {
+ public void DO() {
+ TTreeItem item = treeView.getSelected();
+ File selectedDir = ((TDirectoryTreeItem) item).getFile();
+ try {
+ directoryList.setPath(selectedDir.getCanonicalPath());
+ if (directoryList.getList().size() > 0) {
+ setThumbnail(directoryList.getPath());
+ } else {
+ if (imageWidget != null) {
+ getChildren().remove(imageWidget);
+ }
+ imageWidget = null;
+ }
+ activate(treeView);
+ } catch (IOException e) {
+ // If the backend is Swing, we can emit the stack
+ // trace to stderr. Otherwise, just squash it.
+ if (getScreen() instanceof SwingTerminal) {
+ e.printStackTrace();
+ }
+ }
+ }
+ }
+ );
+ treeViewRoot = new TDirectoryTreeItem(treeView, path, true);
+
+ // Add directory files list
+ directoryList = addDirectoryList(path, getWidth() / 2 + 1, 0,
+ getWidth() / 2 - 1, getHeight() / 2,
+
+ new TAction() {
+ public void DO() {
+ setThumbnail(directoryList.getPath());
+ }
+ },
+ new TAction() {
+
+ public void DO() {
+ setThumbnail(directoryList.getPath());
+ }
+ },
+ filters);
+
+ // This appears to be a bug. If I pass keystrokes to the tree view,
+ // it will center correctly.
+ treeView.onKeypress(new TKeypressEvent(kbDown));
+ treeView.onKeypress(new TKeypressEvent(kbUp));
+
+ if (directoryList.getList().size() > 0) {
+ activate(directoryList);
+ setThumbnail(directoryList.getPath());
+ } else {
+ activate(treeView);
+ }
+ }
+
+ /**
+ * Handle window/screen resize events.
+ *
+ * @param event resize event
+ */
+ @Override
+ public void onResize(final TResizeEvent event) {
+
+ // Resize the tree and list
+ treeView.setY(1);
+ treeView.setWidth(getWidth() / 2);
+ treeView.setHeight(getHeight() - 1);
+ treeView.onResize(new TResizeEvent(TResizeEvent.Type.WIDGET,
+ treeView.getWidth(),
+ treeView.getHeight()));
+ treeView.getTreeView().onResize(new TResizeEvent(TResizeEvent.Type.WIDGET,
+ treeView.getWidth() - 1,
+ treeView.getHeight() - 1));
+ directoryList.setX(getWidth() / 2 + 1);
+ directoryList.setY(1);
+ directoryList.setWidth(getWidth() / 2 - 1);
+ directoryList.setHeight(getHeight() / 2 - 1);
+ directoryList.onResize(new TResizeEvent(TResizeEvent.Type.WIDGET,
+ directoryList.getWidth(),
+ directoryList.getHeight()));
+
+ // Recreate the image
+ if (imageWidget != null) {
+ getChildren().remove(imageWidget);
+ }
+ imageWidget = null;
+ if (directoryList.getList().size() > 0) {
+ activate(directoryList);
+ setThumbnail(directoryList.getPath());
+ } else {
+ activate(treeView);
+ }
+ }
+
+ /**
+ * Handle keystrokes.
+ *
+ * @param keypress keystroke event
+ */
+ @Override
+ public void onKeypress(final TKeypressEvent keypress) {
+
+ if (treeView.isActive() || directoryList.isActive()) {
+ if ((keypress.equals(kbEnter))
+ || (keypress.equals(kbUp))
+ || (keypress.equals(kbDown))
+ || (keypress.equals(kbPgUp))
+ || (keypress.equals(kbPgDn))
+ || (keypress.equals(kbHome))
+ || (keypress.equals(kbEnd))
+ ) {
+ // Tree view will be changing, update the directory list.
+ super.onKeypress(keypress);
+
+ // This is the same action as treeView's enter.
+ TTreeItem item = treeView.getSelected();
+ File selectedDir = ((TDirectoryTreeItem) item).getFile();
+ try {
+ if (treeView.isActive()) {
+ directoryList.setPath(selectedDir.getCanonicalPath());
+ }
+ if (directoryList.getList().size() > 0) {
+ activate(directoryList);
+ setThumbnail(directoryList.getPath());
+ } else {
+ if (imageWidget != null) {
+ getChildren().remove(imageWidget);
+ }
+ imageWidget = null;
+ activate(treeView);
+ }
+ } catch (IOException e) {
+ // If the backend is Swing, we can emit the stack trace
+ // to stderr. Otherwise, just squash it.
+ if (getScreen() instanceof SwingTerminal) {
+ e.printStackTrace();
+ }
+ }
+ return;
+ }
+ }
+
+ // Pass to my parent
+ super.onKeypress(keypress);
+ }
+
+ /**
+ * Draw me on screen.
+ */
+ @Override
+ public void draw() {
+ CellAttributes background = getTheme().getColor("tdesktop.background");
+ putAll(' ', background);
+
+ vLineXY(getWidth() / 2, 0, getHeight(),
+ GraphicsChars.WINDOW_SIDE, getBackground());
+
+ hLineXY(getWidth() / 2, getHeight() / 2, (getWidth() + 1) / 2,
+ GraphicsChars.WINDOW_TOP, getBackground());
+
+ putCharXY(getWidth() / 2, getHeight() / 2,
+ GraphicsChars.WINDOW_LEFT_TEE, getBackground());
+ }
+
+ /**
+ * Set the image thumbnail.
+ *
+ * @param file the image file
+ */
+ private void setThumbnail(final File file) {
+ if (file == null) {
+ return;
+ }
+ if (!file.exists() || !file.isFile()) {
+ return;
+ }
+
+ BufferedImage image = null;
+ try {
+ image = ImageIO.read(file);
+ } catch (IOException e) {
+ // If the backend is Swing, we can emit the stack trace to
+ // stderr. Otherwise, just squash it.
+ if (getScreen() instanceof SwingTerminal) {
+ e.printStackTrace();
+ }
+ return;
+ }
+
+ if (imageWidget != null) {
+ getChildren().remove(imageWidget);
+ }
+ int width = getWidth() / 2 - 1;
+ int height = getHeight() / 2 - 1;
+
+ imageWidget = new TImage(this, getWidth() - width,
+ getHeight() - height, width, height, image, 0, 0, null);
+
+ // Resize the image down until it can fit within the pane.
+ while ((imageWidget.getRows() > height)
+ || (imageWidget.getColumns() > width)
+ ) {
+ imageWidget.onKeypress(new TKeypressEvent(kbAltDown));
+ }
+
+ imageWidget.setActive(false);
+ activate(directoryList);
+ }
+
+}
git://git.nikiroo.be / fanfix-jexer.git / commitdiff