Added progress bar widget demo.

Nabbed from Greg's cheat sheet, with his permission.



git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@9255 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

examples/Makefile

@@ -11,6 +11,7 @@ ALL = howto-add_fd-and-popen$(EXEEXT) \
       howto-text-over-image-button$(EXEEXT) \
       menubar-add$(EXEEXT) \
       nativefilechooser-simple-app$(EXEEXT) \
+      progress-simple$(EXEEXT) \
       table-as-container$(EXEEXT) \
       table-simple$(EXEEXT) \
       table-sort$(EXEEXT) \

examples/progress-simple.cxx

@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <FL/Fl.H>
+#include <FL/Fl_Window.H>
+#include <FL/Fl_Button.H>
+#include <FL/Fl_Progress.H>
+
+//
+// "$Id$"
+//
+// Demonstrate using the Fl_Progress widget in an application - erco 05/02/2005
+//
+// Copyright 2005,2012 Greg Ercolano.
+// Copyright 1998-2012 by Bill Spitzak and others.
+//
+// This library is free software. Distribution and use rights are outlined in
+// the file "COPYING" which should have been included with this file.  If this
+// file is missing or damaged, see the license at:
+//
+//     http://www.fltk.org/COPYING.php
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+
+#ifdef _WIN32
+// WINDOWS
+#include <windows.h>
+#define usleep(v) Sleep(v/1000)
+#else
+// UNIX
+#include <unistd.h>                            // usleep
+#endif
+
+// Button callback
+void butt_cb(Fl_Widget *butt, void *data) {
+
+    // Deactivate the button
+    butt->deactivate();                        // prevent button from being pressed again                   
+    Fl::check();                               // give fltk some cpu to gray out button
+    // Make the progress bar
+    Fl_Window *w = (Fl_Window*)data;           // access parent window
+    w->begin();                                // add progress bar to it..
+    Fl_Progress *progress = new Fl_Progress(10,50,200,30);
+    progress->minimum(0);                      // set progress range to be 0.0 ~ 1.0
+    progress->maximum(1);
+    progress->color(0x88888800);               // background color
+    progress->selection_color(0x4444ff00);     // progress bar color
+    progress->labelcolor(FL_WHITE);            // percent text color
+    w->end();                                  // end adding to window
+    // Computation loop..
+    for ( int t=1; t<=500; t++ ) {
+        progress->value(t/500.0);              // update progress bar with 0.0 ~ 1.0 value
+        char percent[10];
+        sprintf(percent, "%d%%", int((t/500.0)*100.0));
+        progress->label(percent);              // update progress bar's label
+        Fl::check();                           // give fltk some cpu to update the screen
+        usleep(1000);                          // 'your stuff' that's compute intensive
+    }
+    // Cleanup
+    w->remove(progress);                       // remove progress bar from window
+    delete(progress);                          // deallocate it
+    butt->activate();                          // reactivate button
+    w->redraw();                               // tell window to redraw now that progress removed
+}
+// Main
+int main() {
+    Fl_Window win(220,90);
+    Fl_Button butt(10,10,100,25,"Press");
+    butt.callback(butt_cb, &win);
+    win.resizable(win);
+    win.show();
+    return(Fl::run());
+}
+
+//
+// End of "$Id$".
+//