From 982c5a80524fc76a51e39ec9376ef6a243f30c70 Mon Sep 17 00:00:00 2001
From: Niki Roo <niki@nikiroo.be>
Date: Mon, 4 May 2020 14:34:02 +0200
Subject: [PATCH] new: waiting dialog

---
 ui/WaitingDialog.java | 170 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 170 insertions(+)
 create mode 100644 ui/WaitingDialog.java

diff --git a/ui/WaitingDialog.java b/ui/WaitingDialog.java
new file mode 100644
index 0000000..2c02c09
--- /dev/null
+++ b/ui/WaitingDialog.java
@@ -0,0 +1,170 @@
+package be.nikiroo.utils.ui;
+
+import java.awt.Window;
+
+import javax.swing.JDialog;
+import javax.swing.JLabel;
+import javax.swing.SwingWorker;
+import javax.swing.border.EmptyBorder;
+
+import be.nikiroo.utils.Progress;
+import be.nikiroo.utils.Progress.ProgressListener;
+
+/**
+ * A small waiting dialog that will show only if more than X milliseconds passed
+ * before we dismiss it.
+ * 
+ * @author niki
+ */
+public class WaitingDialog extends JDialog {
+	private static final long serialVersionUID = 1L;
+
+	private boolean waitScreen;
+	private Object waitLock = new Object();
+
+	private Progress pg;
+	private ProgressListener pgl;
+
+	/**
+	 * Create a new {@link WaitingDialog}.
+	 * 
+	 * @param parent
+	 *            the parent/owner of this {@link WaitingDialog}
+	 * @param delayMs
+	 *            the delay after which to show the dialog if it is still not
+	 *            dismiss (see {@link WaitingDialog#done()})
+	 */
+	public WaitingDialog(Window parent, long delayMs) {
+		this(parent, delayMs, null, null);
+	}
+
+	/**
+	 * Create a new {@link WaitingDialog}.
+	 * 
+	 * @param parent
+	 *            the parent/owner of this {@link WaitingDialog}
+	 * @param delayMs
+	 *            the delay after which to show the dialog if it is still not
+	 *            dismiss (see {@link WaitingDialog#done()})
+	 * @param pg
+	 *            the {@link Progress} to listen on -- when it is
+	 *            {@link Progress#done()}, this {@link WaitingDialog} will
+	 *            automatically be dismissed as if {@link WaitingDialog#done()}
+	 *            was called
+	 */
+	public WaitingDialog(Window parent, long delayMs, Progress pg) {
+		this(parent, delayMs, pg, null);
+	}
+
+	/**
+	 * Create a new {@link WaitingDialog}.
+	 * 
+	 * @param parent
+	 *            the parent/owner of this {@link WaitingDialog}
+	 * @param delayMs
+	 *            the delay after which to show the dialog if it is still not
+	 *            dismiss (see {@link WaitingDialog#done()})
+	 * @param waitingText
+	 *            a waiting text to display (note: you may want to subclass it
+	 *            for nicer UI)
+	 */
+	public WaitingDialog(Window parent, long delayMs, String waitingText) {
+		this(parent, delayMs, null, waitingText);
+	}
+
+	/**
+	 * Create a new {@link WaitingDialog}.
+	 * 
+	 * @param parent
+	 *            the parent/owner of this {@link WaitingDialog}
+	 * @param delayMs
+	 *            the delay after which to show the dialog if it is still not
+	 *            dismiss (see {@link WaitingDialog#done()})
+	 * @param pg
+	 *            the {@link Progress} to listen on -- when it is
+	 *            {@link Progress#done()}, this {@link WaitingDialog} will
+	 *            automatically be dismissed as if {@link WaitingDialog#done()}
+	 *            was called
+	 * @param waitingText
+	 *            a waiting text to display (note: you may want to subclass it
+	 *            for nicer UI)
+	 */
+	public WaitingDialog(Window parent, long delayMs, Progress pg,
+			String waitingText) {
+		super(parent);
+
+		this.pg = pg;
+
+		if (waitingText != null) {
+			JLabel waitingTextLabel = new JLabel(waitingText);
+			this.add(waitingTextLabel);
+			waitingTextLabel.setBorder(new EmptyBorder(10, 10, 10, 10));
+			this.pack();
+		}
+
+		if (pg != null) {
+			pgl = new ProgressListener() {
+				@Override
+				public void progress(Progress progress, String name) {
+					if (WaitingDialog.this.pg.isDone()) {
+						// Must be done out of this thread (cannot remove a pgl
+						// from a running pgl)
+						new SwingWorker<Void, Void>() {
+							@Override
+							protected Void doInBackground() throws Exception {
+								return null;
+							}
+
+							@Override
+							public void done() {
+								WaitingDialog.this.done();
+							}
+						}.execute();
+					}
+				}
+			};
+
+			pg.addProgressListener(pgl);
+
+			if (pg.isDone()) {
+				done();
+				return;
+			}
+		}
+
+		final long delay = delayMs;
+		new Thread(new Runnable() {
+			@Override
+			public void run() {
+				try {
+					Thread.sleep(delay);
+				} catch (InterruptedException e) {
+				}
+
+				synchronized (waitLock) {
+					if (!waitScreen) {
+						waitScreen = true;
+						setVisible(true);
+					}
+				}
+			}
+		}).start();
+	}
+
+	/**
+	 * Notify this {@link WaitingDialog} that the job is done, and dismiss it if
+	 * it was already showing on screen (or never show it if it was not).
+	 */
+	public void done() {
+		synchronized (waitLock) {
+			if (waitScreen) {
+				setVisible(false);
+			}
+			waitScreen = true;
+		}
+
+		if (pg != null) {
+			pg.removeProgressListener(pgl);
+		}
+	}
+}
-- 
2.27.0