diff widgets/ProgressDialog.cpp @ 378:22b72f0f6a4e

* More work to abstract out interactive components used in the data library,
  so that it does not need to depend on QtGui.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widgets/ProgressDialog.cpp	Fri Mar 14 17:14:21 2008 +0000
@@ -0,0 +1,89 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    This file copyright 2007-2008 QMUL.
+    
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#include "ProgressDialog.h"
+
+#include <QProgressDialog>
+#include <QApplication>
+#include <QTimer>
+
+ProgressDialog::ProgressDialog(QString message, bool cancellable,
+                               int timeBeforeShow, QWidget *parent) : 
+    m_showTimer(0),
+    m_timerElapsed(false)
+{
+    m_dialog = new QProgressDialog(message, cancellable ? tr("Cancel") : 0,
+                                   0, 100, parent);
+    if (timeBeforeShow > 0) {
+        m_dialog->hide();
+        m_showTimer = new QTimer;
+        connect(m_showTimer, SIGNAL(timeout()), this, SLOT(showTimerElapsed()));
+        m_showTimer->setSingleShot(true);
+        m_showTimer->start(timeBeforeShow);
+    } else {
+        m_dialog->show();
+        m_dialog->raise();
+        m_timerElapsed = true;
+    }
+
+    if (cancellable) {
+        connect(m_dialog, SIGNAL(canceled()), this, SIGNAL(cancelled()));
+    }
+}
+
+ProgressDialog::~ProgressDialog()
+{
+    delete m_showTimer;
+    delete m_dialog;
+}
+
+void
+ProgressDialog::setMessage(QString text)
+{
+    m_dialog->setLabelText(text);
+}
+
+void
+ProgressDialog::showTimerElapsed()
+{
+    m_timerElapsed = true;
+    delete m_showTimer;
+    m_showTimer = 0;
+    if (m_dialog->value() > 0) {
+        m_dialog->show();
+    }
+    qApp->processEvents();
+}
+
+void
+ProgressDialog::setProgress(int percentage)
+{
+    if (percentage > m_dialog->value()) {
+
+        m_dialog->setValue(percentage);
+
+        if (percentage >= 100) {
+            delete m_showTimer;
+            m_showTimer = 0;
+            m_dialog->hide();
+        } else if (m_timerElapsed && !m_dialog->isVisible()) {
+            m_dialog->show();
+            m_dialog->raise();
+        }
+
+        qApp->processEvents();
+    }
+}
+