From 9aa68442b6357547e521c78c289c39c1cc1980dd Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Wed, 30 Aug 2023 01:07:27 -0400
Subject: [PATCH] complete implementation of slideshow window

---
 tools/lammps-gui/go-first.png               | Bin 0 -> 4175 bytes
 tools/lammps-gui/go-last.png                | Bin 0 -> 4292 bytes
 tools/lammps-gui/go-next-2.png              | Bin 0 -> 4207 bytes
 tools/lammps-gui/go-previous-2.png          | Bin 0 -> 3809 bytes
 tools/lammps-gui/lammpsgui.cpp              |  47 ++-
 tools/lammps-gui/lammpsgui.qrc              | 103 ++++---
 tools/lammps-gui/lammpsgui.ui               |   2 +-
 tools/lammps-gui/media-playback-start-2.png | Bin 0 -> 3981 bytes
 tools/lammps-gui/media-playlist-repeat.png  | Bin 0 -> 2706 bytes
 tools/lammps-gui/preferences.cpp            |   6 +
 tools/lammps-gui/slideshow.cpp              | 311 ++++++++++++--------
 tools/lammps-gui/slideshow.h                |  46 ++-
 12 files changed, 305 insertions(+), 210 deletions(-)
 create mode 100644 tools/lammps-gui/go-first.png
 create mode 100644 tools/lammps-gui/go-last.png
 create mode 100644 tools/lammps-gui/go-next-2.png
 create mode 100644 tools/lammps-gui/go-previous-2.png
 create mode 100644 tools/lammps-gui/media-playback-start-2.png
 create mode 100644 tools/lammps-gui/media-playlist-repeat.png

diff --git a/tools/lammps-gui/go-first.png b/tools/lammps-gui/go-first.png
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diff --git a/tools/lammps-gui/lammpsgui.cpp b/tools/lammps-gui/lammpsgui.cpp
index b340ab766d..5f6b54d373 100644
--- a/tools/lammps-gui/lammpsgui.cpp
+++ b/tools/lammps-gui/lammpsgui.cpp
@@ -552,6 +552,10 @@ void LammpsGui::open_file(const QString &fileName)
     dirstatus->setText(QString(" Directory: ") + current_dir);
     status->setText("Ready.");
 
+    if (slideshow) {
+        delete slideshow;
+        slideshow = nullptr;
+    }
     update_variables();
 }
 
@@ -717,20 +721,25 @@ void LammpsGui::logupdate()
         }
     }
 
+    // get timestep
+    int step  = 0;
+    void *ptr = lammps.last_thermo("step", 0);
+    if (ptr) {
+        if (lammps.extract_setting("bigint") == 4)
+            step = *(int *)ptr;
+        else
+            step = (int)*(int64_t *)ptr;
+    }
+
     // extract cached thermo data
     if (chartwindow) {
         // thermo data is not yet valid during setup
         void *ptr = lammps.last_thermo("setup", 0);
         if (ptr && *(int *)ptr) return;
 
-        ptr = lammps.last_thermo("step", 0);
+        ptr = lammps.last_thermo("num", 0);
         if (ptr) {
-            int step = 0;
-            if (lammps.extract_setting("bigint") == 4)
-                step = *(int *)ptr;
-            else
-                step = (int)*(int64_t *)ptr;
-            int ncols = *(int *)lammps.last_thermo("num", 0);
+            int ncols = *(int *)ptr;
 
             // check if the column assignment has changed
             // if yes, delete charts and start over
@@ -775,6 +784,22 @@ void LammpsGui::logupdate()
             }
         }
     }
+
+    // update list of available image file names
+
+    QString imagefile = (const char *)lammps.last_thermo("imagename", 0);
+    if (!imagefile.isEmpty()) {
+        if (!slideshow) {
+            slideshow = new SlideShow(current_file);
+            if (QSettings().value("viewslide", true).toBool())
+                slideshow->show();
+            else
+                slideshow->hide();
+        } else {
+            slideshow->setWindowTitle(QString("LAMMPS-GUI - Slide Show: ") + current_file);
+        }
+        slideshow->add_image(imagefile);
+    }
 }
 
 void LammpsGui::modified()
@@ -963,6 +988,12 @@ void LammpsGui::do_run(bool use_buffer)
     else
         chartwindow->hide();
 
+    if (slideshow) {
+        slideshow->setWindowTitle("LAMMPS-GUI - Slide Show");
+        slideshow->clear();
+        slideshow->hide();
+    }
+
     logupdater = new QTimer(this);
     connect(logupdater, &QTimer::timeout, this, &LammpsGui::logupdate);
     logupdater->start(100);
@@ -991,7 +1022,7 @@ void LammpsGui::render_image()
 
 void LammpsGui::view_slides()
 {
-    if (!slideshow) slideshow = new SlideShow(current_file, &lammps);
+    if (!slideshow) slideshow = new SlideShow(current_file);
     if (slideshow->isVisible())
         slideshow->hide();
     else
diff --git a/tools/lammps-gui/lammpsgui.qrc b/tools/lammps-gui/lammpsgui.qrc
index 15ff13da4b..a27d6abbea 100644
--- a/tools/lammps-gui/lammpsgui.qrc
+++ b/tools/lammps-gui/lammpsgui.qrc
@@ -1,50 +1,57 @@
+<!-- -*- xml -*- -->
 <RCC>
-    <qresource prefix="/">
-        <file>lammps-icon-128x128.png</file>
-        <file>antialias.png</file>
-        <file>application-calc.png</file>
-        <file>application-exit.png</file>
-        <file>application-plot.png</file>
-        <file>axes-img.png</file>
-        <file>document-new.png</file>
-        <file>document-open-recent.png</file>
-        <file>document-open.png</file>
-        <file>document-revert.png</file>
-        <file>document-save-as.png</file>
-        <file>document-save.png</file>
-        <file>edit-copy.png</file>
-        <file>edit-cut.png</file>
-        <file>edit-delete.png</file>
-        <file>edit-paste.png</file>
-        <file>edit-redo.png</file>
-        <file>edit-undo.png</file>
-        <file>emblem-photos.png</file>
-        <file>gtk-go-down.png</file>
-        <file>gtk-go-up.png</file>
-        <file>gtk-zoom-fit.png</file>
-        <file>gtk-zoom-in.png</file>
-        <file>gtk-zoom-out.png</file>
-        <file>hd-img.png</file>
-        <file>help-about.png</file>
-        <file>help-browser.png</file>
-        <file>help-faq.png</file>
-        <file>help_index.table</file>
-        <file>image-x-generic.png</file>
-        <file>object-rotate-left.png</file>
-        <file>object-rotate-right.png</file>
-        <file>ovito.png</file>
-        <file>preferences-desktop-font.png</file>
-        <file>preferences-desktop-personal.png</file>
-        <file>preferences-desktop.png</file>
-        <file>process-stop.png</file>
-        <file>run-file.png</file>
-        <file>system-box.png</file>
-        <file>system-help.png</file>
-        <file>system-run.png</file>
-        <file>utilities-terminal.png</file>
-        <file>vdw-style.png</file>
-        <file>vmd.png</file>
-        <file>window-close.png</file>
-        <file>x-office-drawing.png</file>
-    </qresource>
+  <qresource prefix="/">
+    <file>lammps-icon-128x128.png</file>
+    <file>antialias.png</file>
+    <file>application-calc.png</file>
+    <file>application-exit.png</file>
+    <file>application-plot.png</file>
+    <file>axes-img.png</file>
+    <file>document-new.png</file>
+    <file>document-open-recent.png</file>
+    <file>document-open.png</file>
+    <file>document-revert.png</file>
+    <file>document-save-as.png</file>
+    <file>document-save.png</file>
+    <file>edit-copy.png</file>
+    <file>edit-cut.png</file>
+    <file>edit-delete.png</file>
+    <file>edit-paste.png</file>
+    <file>edit-redo.png</file>
+    <file>edit-undo.png</file>
+    <file>emblem-photos.png</file>
+    <file>go-first.png</file>
+    <file>go-last.png</file>
+    <file>go-next-2.png</file>
+    <file>go-previous-2.png</file>
+    <file>gtk-go-down.png</file>
+    <file>gtk-go-up.png</file>
+    <file>gtk-zoom-fit.png</file>
+    <file>gtk-zoom-in.png</file>
+    <file>gtk-zoom-out.png</file>
+    <file>hd-img.png</file>
+    <file>help-about.png</file>
+    <file>help-browser.png</file>
+    <file>help-faq.png</file>
+    <file>help_index.table</file>
+    <file>image-x-generic.png</file>
+    <file>media-playback-start-2.png</file>
+    <file>media-playlist-repeat.png</file>
+    <file>object-rotate-left.png</file>
+    <file>object-rotate-right.png</file>
+    <file>ovito.png</file>
+    <file>preferences-desktop-font.png</file>
+    <file>preferences-desktop-personal.png</file>
+    <file>preferences-desktop.png</file>
+    <file>process-stop.png</file>
+    <file>run-file.png</file>
+    <file>system-box.png</file>
+    <file>system-help.png</file>
+    <file>system-run.png</file>
+    <file>utilities-terminal.png</file>
+    <file>vdw-style.png</file>
+    <file>vmd.png</file>
+    <file>window-close.png</file>
+    <file>x-office-drawing.png</file>
+  </qresource>
 </RCC>
diff --git a/tools/lammps-gui/lammpsgui.ui b/tools/lammps-gui/lammpsgui.ui
index f5d9f92949..77257b23c2 100644
--- a/tools/lammps-gui/lammpsgui.ui
+++ b/tools/lammps-gui/lammpsgui.ui
@@ -361,7 +361,7 @@
     <string>&amp;Slide Show Window</string>
    </property>
    <property name="shortcut">
-    <string>Ctrl+Shift+W</string>
+    <string>Ctrl+L</string>
    </property>
   </action>
   <action name="action_1">
diff --git a/tools/lammps-gui/media-playback-start-2.png b/tools/lammps-gui/media-playback-start-2.png
new file mode 100644
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diff --git a/tools/lammps-gui/media-playlist-repeat.png b/tools/lammps-gui/media-playlist-repeat.png
new file mode 100644
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diff --git a/tools/lammps-gui/preferences.cpp b/tools/lammps-gui/preferences.cpp
index bdb7d39dbf..eb8d0fc8e2 100644
--- a/tools/lammps-gui/preferences.cpp
+++ b/tools/lammps-gui/preferences.cpp
@@ -161,6 +161,8 @@ void Preferences::accept()
     if (box) settings->setValue("viewlog", box->isChecked());
     box = tabWidget->findChild<QCheckBox *>("viewchart");
     if (box) settings->setValue("viewchart", box->isChecked());
+    box = tabWidget->findChild<QCheckBox *>("viewslide");
+    if (box) settings->setValue("viewslide", box->isChecked());
 
     if (need_relaunch) {
         QMessageBox msg(QMessageBox::Information, QString("Relaunching LAMMPS-GUI"),
@@ -192,6 +194,9 @@ GeneralTab::GeneralTab(QSettings *_settings, LammpsWrapper *_lammps, QWidget *pa
     auto *pltv = new QCheckBox("Show chart window by default");
     pltv->setObjectName("viewchart");
     pltv->setCheckState(settings->value("viewchart", true).toBool() ? Qt::Checked : Qt::Unchecked);
+    auto *sldv = new QCheckBox("Show slide show by default");
+    sldv->setObjectName("viewslide");
+    sldv->setCheckState(settings->value("viewslide", true).toBool() ? Qt::Checked : Qt::Unchecked);
     auto *logr = new QCheckBox("Replace log window on new run");
     logr->setObjectName("logreplace");
     logr->setCheckState(settings->value("logreplace", false).toBool() ? Qt::Checked
@@ -232,6 +237,7 @@ GeneralTab::GeneralTab(QSettings *_settings, LammpsWrapper *_lammps, QWidget *pa
     layout->addWidget(cite);
     layout->addWidget(logv);
     layout->addWidget(pltv);
+    layout->addWidget(sldv);
     layout->addWidget(logr);
     layout->addWidget(pltr);
     layout->addWidget(imgr);
diff --git a/tools/lammps-gui/slideshow.cpp b/tools/lammps-gui/slideshow.cpp
index cc8c57d4f0..d949907668 100644
--- a/tools/lammps-gui/slideshow.cpp
+++ b/tools/lammps-gui/slideshow.cpp
@@ -12,177 +12,240 @@
 ------------------------------------------------------------------------- */
 
 #include "slideshow.h"
-#include "lammpswrapper.h"
 
-#include <QAction>
 #include <QDialogButtonBox>
-#include <QDir>
-#include <QFileDialog>
-#include <QGuiApplication>
+#include <QFileInfo>
+#include <QHBoxLayout>
 #include <QImage>
 #include <QImageReader>
 #include <QLabel>
-#include <QMenuBar>
-#include <QMessageBox>
 #include <QPalette>
-#include <QPoint>
 #include <QPushButton>
-#include <QScreen>
-#include <QScrollArea>
-#include <QScrollBar>
 #include <QSettings>
-#include <QStatusBar>
+#include <QShortcut>
+#include <QSpacerItem>
+#include <QTimer>
 #include <QVBoxLayout>
-#include <QWidgetAction>
 
-#include <cmath>
-
-static const QString blank(" ");
-
-SlideShow::SlideShow(const QString &fileName, LammpsWrapper *_lammps, QWidget *parent) :
-    QDialog(parent), imageLabel(new QLabel), scrollArea(new QScrollArea), menuBar(new QMenuBar),
-    lammps(_lammps)
+SlideShow::SlideShow(const QString &fileName, QWidget *parent) :
+    QDialog(parent), playtimer(nullptr), imageLabel(new QLabel), imageName(new QLabel("(none)")),
+    do_loop(true)
 {
     imageLabel->setBackgroundRole(QPalette::Base);
-    imageLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
-    imageLabel->setScaledContents(true);
-    imageLabel->minimumSizeHint();
+    imageLabel->setScaledContents(false);
+    imageLabel->setMinimumSize(100, 100);
 
-    scrollArea->setBackgroundRole(QPalette::Dark);
-    scrollArea->setWidget(imageLabel);
-    scrollArea->setVisible(false);
+    imageName->setFrameStyle(QFrame::Raised);
+    imageName->setFrameShape(QFrame::Panel);
+    imageName->setAlignment(Qt::AlignCenter);
+
+    auto *shortcut = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_W), this);
+    QObject::connect(shortcut, &QShortcut::activated, this, &SlideShow::close);
 
     buttonBox = new QDialogButtonBox(QDialogButtonBox::Close);
 
     connect(buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept);
     connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);
 
-    QVBoxLayout *mainLayout = new QVBoxLayout;
-    QSettings settings;
+    auto *mainLayout = new QVBoxLayout;
+    auto *navLayout  = new QHBoxLayout;
 
-    mainLayout->addWidget(scrollArea);
+    auto *gofirst = new QPushButton(QIcon(":/go-first.png"), "");
+    gofirst->setToolTip("Go to first Image");
+    auto *goprev = new QPushButton(QIcon(":/go-previous-2.png"), "");
+    goprev->setToolTip("Go to previous Image");
+    auto *goplay = new QPushButton(QIcon(":/media-playback-start-2.png"), "");
+    goplay->setToolTip("Play animation");
+    goplay->setCheckable(true);
+    goplay->setChecked(playtimer);
+    goplay->setObjectName("play");
+    auto *gonext = new QPushButton(QIcon(":/go-next-2.png"), "");
+    gonext->setToolTip("Go to next Image");
+    auto *golast = new QPushButton(QIcon(":/go-last.png"), "");
+    golast->setToolTip("Go to last Image");
+    auto *goloop = new QPushButton(QIcon(":/media-playlist-repeat.png"), "");
+    goloop->setToolTip("Loop animation");
+    goloop->setCheckable(true);
+    goloop->setChecked(do_loop);
+
+    auto *zoomin = new QPushButton(QIcon(":/gtk-zoom-in.png"), "");
+    zoomin->setToolTip("Zoom in by 10 percent");
+    auto *zoomout = new QPushButton(QIcon(":/gtk-zoom-out.png"), "");
+    zoomout->setToolTip("Zoom out by 10 percent");
+    auto *normal = new QPushButton(QIcon(":/gtk-zoom-fit.png"), "");
+    normal->setToolTip("Reset zoom to normal");
+
+    connect(gofirst, &QPushButton::released, this, &SlideShow::first);
+    connect(goprev, &QPushButton::released, this, &SlideShow::prev);
+    connect(goplay, &QPushButton::released, this, &SlideShow::play);
+    connect(gonext, &QPushButton::released, this, &SlideShow::next);
+    connect(golast, &QPushButton::released, this, &SlideShow::last);
+    connect(goloop, &QPushButton::released, this, &SlideShow::loop);
+    connect(zoomin, &QPushButton::released, this, &SlideShow::zoomIn);
+    connect(zoomout, &QPushButton::released, this, &SlideShow::zoomOut);
+    connect(gofirst, &QPushButton::released, this, &SlideShow::first);
+    connect(normal, &QPushButton::released, this, &SlideShow::normalSize);
+
+    navLayout->addWidget(imageName);
+    navLayout->addSpacerItem(new QSpacerItem(10, 10, QSizePolicy::Expanding, QSizePolicy::Minimum));
+    navLayout->addWidget(gofirst);
+    navLayout->addWidget(goprev);
+    navLayout->addWidget(goplay);
+    navLayout->addWidget(gonext);
+    navLayout->addWidget(golast);
+    navLayout->addWidget(goloop);
+
+    navLayout->addWidget(zoomin);
+    navLayout->addWidget(zoomout);
+    navLayout->addWidget(normal);
+
+    mainLayout->addWidget(imageLabel);
+    mainLayout->addLayout(navLayout);
     mainLayout->addWidget(buttonBox);
-    setWindowTitle(QString("Slide Show: ") + QFileInfo(fileName).fileName());
-    createActions();
+    setWindowTitle(QString("LAMMPS-GUI - Slide Show: ") + QFileInfo(fileName).fileName());
 
+    imagefiles.clear();
     scaleFactor = 1.0;
-    resize(image.width() + 20, image.height() + 50);
+    current     = 0;
 
-    scrollArea->setVisible(true);
-    fitToWindowAct->setEnabled(true);
-    updateActions();
-    if (!fitToWindowAct->isChecked()) imageLabel->adjustSize();
     setLayout(mainLayout);
 }
 
-void SlideShow::saveAs()
+void SlideShow::add_image(const QString &filename)
 {
-    QString fileName = QFileDialog::getSaveFileName(this, "Save Image File As", QString(),
-                                                    "Image Files (*.jpg *.png *.bmp *.ppm)");
-    saveFile(fileName);
+    if (!imagefiles.contains(filename)) {
+        int lastidx = imagefiles.size();
+        imagefiles.append(filename);
+        loadImage(lastidx);
+    }
 }
 
-void SlideShow::copy() {}
+void SlideShow::clear()
+{
+    imagefiles.clear();
+    image.fill(Qt::black);
+    imageLabel->setPixmap(QPixmap::fromImage(image));
+    imageLabel->adjustSize();
+    imageName->setText("(none)");
+    repaint();
+}
+
+void SlideShow::loadImage(int idx)
+{
+    if ((idx < 0) || (idx >= imagefiles.size())) return;
+
+    do {
+        QImageReader reader(imagefiles[idx]);
+        reader.setAutoTransform(true);
+        const QImage newImage = reader.read();
+
+        // There was an error reading the image file. Try reading the previous image instead.
+        if (newImage.isNull()) {
+            --idx;
+        } else {
+            int newheight = (int)newImage.height() * scaleFactor;
+            int newwidth  = (int)newImage.width() * scaleFactor;
+            image         = newImage.scaled(newwidth, newheight, Qt::IgnoreAspectRatio,
+                                            Qt::SmoothTransformation);
+            imageLabel->setPixmap(QPixmap::fromImage(image));
+            imageLabel->setMinimumSize(newwidth, newheight);
+            imageName->setText(imagefiles[idx]);
+            adjustSize();
+            current = idx;
+            break;
+        }
+    } while (idx >= 0);
+}
+
+void SlideShow::first()
+{
+    current = 0;
+    loadImage(current);
+}
+
+void SlideShow::last()
+{
+    current = imagefiles.size() - 1;
+    loadImage(current);
+}
+
+void SlideShow::play()
+{
+    // if we do not loop, start animation from beginning
+    if (!do_loop) current = 0;
+
+    if (playtimer) {
+        playtimer->stop();
+        delete playtimer;
+        playtimer = nullptr;
+    } else {
+        playtimer = new QTimer(this);
+        connect(playtimer, &QTimer::timeout, this, &SlideShow::next);
+        playtimer->start(100);
+    }
+
+    // reset push button state. use findChild() if not triggered from button.
+    QPushButton *button = qobject_cast<QPushButton *>(sender());
+    if (!button) button = findChild<QPushButton *>("play");
+    if (button) button->setChecked(playtimer);
+}
+
+void SlideShow::next()
+{
+    ++current;
+    if (current >= imagefiles.size()) {
+        if (do_loop) {
+            current = 0;
+        } else {
+            // stop animation
+            if (playtimer) play();
+            --current;
+        }
+    }
+    loadImage(current);
+}
+
+void SlideShow::prev()
+{
+    --current;
+    if (current < 0) {
+        if (do_loop)
+            current = imagefiles.size() - 1;
+        else
+            current = 0;
+    }
+    loadImage(current);
+}
+
+void SlideShow::loop()
+{
+    QPushButton *button = qobject_cast<QPushButton *>(sender());
+    do_loop             = !do_loop;
+    button->setChecked(do_loop);
+}
 
 void SlideShow::zoomIn()
 {
-    scaleImage(1.25);
+    scaleImage(1.1);
 }
 
 void SlideShow::zoomOut()
 {
-    scaleImage(0.8);
+    scaleImage(0.9);
 }
 
 void SlideShow::normalSize()
 {
-    imageLabel->adjustSize();
     scaleFactor = 1.0;
-}
-
-void SlideShow::fitToWindow()
-{
-    bool fitToWindow = fitToWindowAct->isChecked();
-    scrollArea->setWidgetResizable(fitToWindow);
-    if (!fitToWindow) normalSize();
-    updateActions();
-}
-
-void SlideShow::saveFile(const QString &fileName)
-{
-    if (!fileName.isEmpty()) image.save(fileName);
-}
-
-void SlideShow::createActions()
-{
-    QMenu *fileMenu = menuBar->addMenu("&File");
-
-    saveAsAct = fileMenu->addAction("&Save As...", this, &SlideShow::saveAs);
-    saveAsAct->setIcon(QIcon(":/document-save-as.png"));
-    saveAsAct->setEnabled(false);
-    fileMenu->addSeparator();
-    copyAct = fileMenu->addAction("&Copy", this, &SlideShow::copy);
-    copyAct->setIcon(QIcon(":/edit-copy.png"));
-    copyAct->setShortcut(QKeySequence::Copy);
-    copyAct->setEnabled(false);
-    fileMenu->addSeparator();
-    QAction *exitAct = fileMenu->addAction("&Close", this, &QWidget::close);
-    exitAct->setIcon(QIcon(":/window-close.png"));
-    exitAct->setShortcut(QKeySequence::fromString("Ctrl+W"));
-
-    QMenu *viewMenu = menuBar->addMenu("&View");
-
-    zoomInAct = viewMenu->addAction("Image Zoom &In (25%)", this, &SlideShow::zoomIn);
-    zoomInAct->setShortcut(QKeySequence::ZoomIn);
-    zoomInAct->setIcon(QIcon(":/gtk-zoom-in.png"));
-    zoomInAct->setEnabled(false);
-
-    zoomOutAct = viewMenu->addAction("Image Zoom &Out (25%)", this, &SlideShow::zoomOut);
-    zoomOutAct->setShortcut(QKeySequence::ZoomOut);
-    zoomOutAct->setIcon(QIcon(":/gtk-zoom-out.png"));
-    zoomOutAct->setEnabled(false);
-
-    normalSizeAct = viewMenu->addAction("&Reset Image Size", this, &SlideShow::normalSize);
-    normalSizeAct->setShortcut(QKeySequence::fromString("Ctrl+0"));
-    normalSizeAct->setIcon(QIcon(":/gtk-zoom-fit.png"));
-    normalSizeAct->setEnabled(false);
-
-    viewMenu->addSeparator();
-
-    fitToWindowAct = viewMenu->addAction("&Fit to Window", this, &SlideShow::fitToWindow);
-    fitToWindowAct->setEnabled(false);
-    fitToWindowAct->setCheckable(true);
-    fitToWindowAct->setShortcut(QKeySequence::fromString("Ctrl+="));
-}
-
-void SlideShow::updateActions()
-{
-    saveAsAct->setEnabled(!image.isNull());
-    copyAct->setEnabled(!image.isNull());
-    zoomInAct->setEnabled(!fitToWindowAct->isChecked());
-    zoomOutAct->setEnabled(!fitToWindowAct->isChecked());
-    normalSizeAct->setEnabled(!fitToWindowAct->isChecked());
+    scaleImage(1.0);
 }
 
 void SlideShow::scaleImage(double factor)
 {
     scaleFactor *= factor;
-#if QT_VERSION < QT_VERSION_CHECK(5, 15, 0)
-    imageLabel->resize(scaleFactor * imageLabel->pixmap()->size());
-#else
-    imageLabel->resize(scaleFactor * imageLabel->pixmap(Qt::ReturnByValue).size());
-#endif
-
-    adjustScrollBar(scrollArea->horizontalScrollBar(), factor);
-    adjustScrollBar(scrollArea->verticalScrollBar(), factor);
-    zoomInAct->setEnabled(scaleFactor < 3.0);
-    zoomOutAct->setEnabled(scaleFactor > 0.333);
-}
-
-void SlideShow::adjustScrollBar(QScrollBar *scrollBar, double factor)
-{
-    scrollBar->setValue(
-        int(factor * scrollBar->value() + ((factor - 1) * scrollBar->pageStep() / 2)));
+    if (scaleFactor > 2.0) scaleFactor = 2.0;
+    if (scaleFactor < 0.25) scaleFactor = 0.25;
+    loadImage(current);
 }
 
 // Local Variables:
diff --git a/tools/lammps-gui/slideshow.h b/tools/lammps-gui/slideshow.h
index bde011e905..1bf62a99bb 100644
--- a/tools/lammps-gui/slideshow.h
+++ b/tools/lammps-gui/slideshow.h
@@ -14,60 +14,48 @@
 #ifndef SLIDESHOW_H
 #define SLIDESHOW_H
 
-#include <QComboBox>
 #include <QDialog>
 #include <QImage>
 #include <QString>
+#include <QStringList>
 
-class QAction;
-class QMenuBar;
 class QDialogButtonBox;
 class QLabel;
-class QObject;
-class QScrollArea;
-class QScrollBar;
-class QStatusBar;
-class LammpsWrapper;
-class QComboBox;
+class QTimer;
 
 class SlideShow : public QDialog {
     Q_OBJECT
 
 public:
-    explicit SlideShow(const QString &fileName, LammpsWrapper *_lammps,
-                         QWidget *parent = nullptr);
+    explicit SlideShow(const QString &fileName, QWidget *parent = nullptr);
+    void add_image(const QString &filename);
+    void clear();
 
 private slots:
-    void saveAs();
-    void copy();
+    void first();
+    void last();
+    void next();
+    void prev();
+    void play();
+    void loop();
     void zoomIn();
     void zoomOut();
     void normalSize();
-    void fitToWindow();
 
 private:
-    void createActions();
-    void updateActions();
-    void saveFile(const QString &fileName);
     void scaleImage(double factor);
-    void adjustScrollBar(QScrollBar *scrollBar, double factor);
+    void loadImage(int idx);
 
 private:
     QImage image;
-    QMenuBar *menuBar;
-    QLabel *imageLabel;
-    QScrollArea *scrollArea;
+    QTimer *playtimer;
+    QLabel *imageLabel, *imageName;
     QDialogButtonBox *buttonBox;
     double scaleFactor = 1.0;
 
-    QAction *saveAsAct;
-    QAction *copyAct;
-    QAction *zoomInAct;
-    QAction *zoomOutAct;
-    QAction *normalSizeAct;
-    QAction *fitToWindowAct;
-
-    LammpsWrapper *lammps;
+    int current;
+    bool do_loop;
+    QStringList imagefiles;
 };
 #endif