1 files changed, 111 insertions, 0 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Custom Widgets/common/org/eclipse/swt/custom/BusyIndicator.java b/bundles/org.eclipse.swt/Eclipse SWT Custom Widgets/common/org/eclipse/swt/custom/BusyIndicator.java
new file mode 100755
index 0000000000..d97f8be1f7
--- /dev/null
+++ b/bundles/org.eclipse.swt/Eclipse SWT Custom Widgets/common/org/eclipse/swt/custom/BusyIndicator.java
@@ -0,0 +1,111 @@
+package org.eclipse.swt.custom;
+
+/*
+ * Licensed Materials - Property of IBM,
+ * (c) Copyright IBM Corp. 1998, 2001  All Rights Reserved
+ */
+
+import org.eclipse.swt.*;
+import org.eclipse.swt.events.*;
+import org.eclipse.swt.graphics.*;
+import org.eclipse.swt.widgets.*;
+
+/**
+ * Support for showing a Busy Cursor during a long running process.
+ */
+public class BusyIndicator {
+
+	static int[] counts = new int[0];
+	static Display[] displays = new Display[0];
+	static Cursor[] cursors = new Cursor[0];
+
+/**
+ * Runs the given <code>Runnable</code> while providing
+ * busy feedback using this busy indicator.
+ * 
+ * @param the display on which the busy feedback should be
+ *        displayed.  If the display is null, the Display for the current
+ *        thread will be used.  If there is no Display for the current thread,
+ *        the runnable code will be executed and no busy feedback will be displayed.
+ * @param the runnable for which busy feedback is to be shown
+ * @see #showWhile
+ */
+
+public static void showWhile(Display display, Runnable runnable) {
+	if (display == null) {
+		display = Display.getCurrent();
+		if (display == null) {
+			runnable.run();
+			return;
+		}
+	}
+	
+	int index = 0;
+	while (index < displays.length) {
+		if (displays[index] == display) break;
+		index++;
+	}
+	if (index == displays.length) {
+		Display[] newDisplays = new Display[displays.length + 1];
+		System.arraycopy(displays, 0, newDisplays, 0, displays.length);
+		displays = newDisplays;
+		displays[index] = display;
+		final Display d = display;
+		display.disposeExec( new Runnable() {
+			public void run() {
+				clear (d);
+			}
+		});
+		
+		int[] newCounts = new int[counts.length + 1];
+		System.arraycopy(counts, 0, newCounts, 0, counts.length);
+		counts = newCounts;
+		
+		Cursor[] newCursors = new Cursor[cursors.length + 1];
+		System.arraycopy(cursors, 0, newCursors, 0, cursors.length);
+		cursors = newCursors;
+	}
+	
+	if (counts[index] == 0) {
+		cursors[index] = new Cursor(display, SWT.CURSOR_WAIT);
+	}
+	
+	counts[index]++;
+	
+	Shell[] shells = display.getShells();
+	for (int i = 0; i < shells.length; i++) {
+		shells[i].setCursor(cursors[index]);
+	}
+		
+	try {
+		runnable.run();
+	} finally {
+		counts[index]--;
+		if (counts[index] == 0) {
+			shells = display.getShells();
+			for (int i = 0; i < shells.length; i++) {
+				shells[i].setCursor(null);
+			}
+			cursors[index].dispose();
+			cursors[index] = null;
+		}
+	}
+}
+
+static void clear(Display display) {
+	int index = 0;
+	while (index < displays.length) {
+		if (displays[index] == display) break;
+		index++;
+	}
+	
+	if (index == displays.length) return;
+	
+	if (cursors[index] != null) {
+		cursors[index].dispose();
+	}
+	cursors[index] = null;
+	counts[index] = 0;
+	displays[index] = null;
+}
+}
+\ No newline at end of file