implement auto-save on run and quit

tools/lammps-gui/TODO.md

@@ -5,7 +5,8 @@ LAMMPS-GUI TODO list:
 - figure out how widgets can be resized to fraction of available screen size.
 - figure out stacking order of frames and whether it can be more flexible
 - figure out how to avoid corrupted cached thermo data while reading it.
-- bundle LAMMPS tutorial input files
+- implement a timed "Auto-Save" feature that saves after some idle time.  set timeout in Editor preferences.
+- bundle or download? LAMMPS tutorial input files
 - add a "Colors" menu to the image viewer to adjust color settings for the
   current image (unlike the defaults in the perferences). Support color by
   property (e.g. scan computes or fixes with per-atom data), define colormaps etc.

tools/lammps-gui/fileviewer.cpp

@@ -16,6 +16,7 @@
 #include "lammpsgui.h"
 
 #include <QApplication>
+#include <QEvent>
 #include <QFile>
 #include <QFileInfo>
 #include <QIcon>

tools/lammps-gui/lammpsgui.cpp

@@ -29,6 +29,7 @@
 #include <QClipboard>
 #include <QCoreApplication>
 #include <QDesktopServices>
+#include <QEvent>
 #include <QFileDialog>
 #include <QFileInfo>
 #include <QFont>
@@ -154,6 +155,8 @@ LammpsGui::LammpsGui(QWidget *parent, const char *filename) :
     lammps_args.push_back(mystrdup("-log"));
     lammps_args.push_back(mystrdup("none"));
 
+    installEventFilter(this);
+
     setWindowIcon(QIcon(":/icons/lammps-icon-128x128.png"));
 
     QFont all_font("Arial", -1);
@@ -715,6 +718,7 @@ void LammpsGui::quit()
     lammpsstatus->hide();
     lammps.finalize();
 
+    autoSave();
     if (ui->textEdit->document()->isModified()) {
         QMessageBox msg;
         msg.setWindowTitle("Unsaved Changes");
@@ -1004,6 +1008,7 @@ void LammpsGui::do_run(bool use_buffer)
         return;
     }
 
+    autoSave();
     if (!use_buffer && ui->textEdit->document()->isModified()) {
         QMessageBox msg;
         msg.setWindowTitle("Unsaved Changes");
@@ -1231,6 +1236,23 @@ void LammpsGui::setDocver()
     }
 }
 
+void LammpsGui::autoSave()
+{
+    // no need to auto-save, if the document has no name or is not modified.
+    QString fileName = current_file;
+    if (fileName.isEmpty()) return;
+    if (!ui->textEdit->document()->isModified()) return;
+
+    // check preference
+    bool autosave = false;
+    QSettings settings;
+    settings.beginGroup("reformat");
+    autosave = settings.value("autosave", false).toBool();
+    settings.endGroup();
+
+    if (autosave) write_file(fileName);
+}
+
 void LammpsGui::about()
 {
     std::string version = "This is LAMMPS-GUI version " LAMMPS_GUI_VERSION;
@@ -1505,6 +1527,13 @@ void LammpsGui::start_lammps()
     }
 }
 
+bool LammpsGui::eventFilter(QObject *watched, QEvent *event)
+{
+    if (event->type() == QEvent::Close) {
+        autoSave();
+    }
+    return QWidget::eventFilter(watched, event);
+}
 // Local Variables:
 // c-basic-offset: 4
 // End:

tools/lammps-gui/lammpsgui.h

@@ -16,6 +16,7 @@
 
 #include <QMainWindow>
 
+#include <QEvent>
 #include <QGridLayout>
 #include <QList>
 #include <QPair>
@@ -70,6 +71,8 @@ protected:
     void start_lammps();
     void run_done();
     void setDocver();
+    void autoSave();
+    bool eventFilter(QObject *watched, QEvent *event) override;
 
 public slots:
     void quit();

tools/lammps-gui/preferences.cpp

@@ -196,6 +196,8 @@ void Preferences::accept()
     if (box) settings->setValue("return", box->isChecked());
     box = tabWidget->findChild<QCheckBox *>("autoval");
     if (box) settings->setValue("automatic", box->isChecked());
+    box = tabWidget->findChild<QCheckBox *>("savval");
+    if (box) settings->setValue("autosave", box->isChecked());
     settings->endGroup();
 
     QDialog::accept();
@@ -536,29 +538,34 @@ EditorTab::EditorTab(QSettings *_settings, QWidget *parent) : QWidget(parent), s
     auto *namelbl  = new QLabel("Name width:");
     auto *retlbl   = new QLabel("Reformat with 'Enter':");
     auto *autolbl  = new QLabel("Automatic completion:");
+    auto *savlbl   = new QLabel("Auto-save on 'Run' and 'Quit':");
     auto *cmdval   = new QSpinBox;
     auto *typeval  = new QSpinBox;
     auto *idval    = new QSpinBox;
     auto *nameval  = new QSpinBox;
     auto *retval   = new QCheckBox;
     auto *autoval  = new QCheckBox;
+    auto *savval   = new QCheckBox;
+    cmdval->setObjectName("cmdval");
     cmdval->setRange(1, 32);
     cmdval->setValue(settings->value("command", "16").toInt());
-    cmdval->setObjectName("cmdval");
+    typeval->setObjectName("typeval");
     typeval->setRange(1, 32);
     typeval->setValue(settings->value("type", "4").toInt());
-    typeval->setObjectName("typeval");
+    idval->setObjectName("idval");
     idval->setRange(1, 32);
     idval->setValue(settings->value("id", "8").toInt());
-    idval->setObjectName("idval");
+    nameval->setObjectName("nameval");
     nameval->setRange(1, 32);
     nameval->setValue(settings->value("name", "8").toInt());
-    nameval->setObjectName("nameval");
-    retval->setCheckState(settings->value("return", false).toBool() ? Qt::Checked : Qt::Unchecked);
     retval->setObjectName("retval");
+    retval->setCheckState(settings->value("return", false).toBool() ? Qt::Checked : Qt::Unchecked);
+    autoval->setObjectName("autoval");
     autoval->setCheckState(settings->value("automatic", true).toBool() ? Qt::Checked
                                                                        : Qt::Unchecked);
-    autoval->setObjectName("autoval");
+    savval->setObjectName("savval");
+    savval->setCheckState(settings->value("autosave", false).toBool() ? Qt::Checked
+                                                                      : Qt::Unchecked);
     settings->endGroup();
 
     int i = 0;
@@ -575,6 +582,8 @@ EditorTab::EditorTab(QSettings *_settings, QWidget *parent) : QWidget(parent), s
     grid->addWidget(retval, i++, 1, Qt::AlignVCenter);
     grid->addWidget(autolbl, i, 0, Qt::AlignTop);
     grid->addWidget(autoval, i++, 1, Qt::AlignVCenter);
+    grid->addWidget(savlbl, i, 0, Qt::AlignTop);
+    grid->addWidget(savval, i++, 1, Qt::AlignVCenter);
 
     grid->addItem(new QSpacerItem(100, 100, QSizePolicy::Minimum, QSizePolicy::Expanding), i, 0);
     grid->addItem(new QSpacerItem(100, 100, QSizePolicy::Minimum, QSizePolicy::Expanding), i, 1);