feat: add prev and next button

Use GitHub Action to test building under macOS

.github/workflows/macos.yml

@@ -0,0 +1,17 @@
+name: macOS CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Install Qt
+      uses: jurplel/install-qt-action@v2.2.1
+    - name: Run a qt project
+      run: |
+        cmake ./
+        make

.github/workflows/ubuntu.yml

@@ -0,0 +1,20 @@
+name: Ubuntu 20.04 CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-20.04
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Get build dept.
+      run: sudo apt install cmake qtbase5-dev libqt5svg5-dev qttools5-dev
+    - name: Build it
+      run: |
+        mkdir build
+        cd build
+        cmake ../
+        make
+        sudo cpack

CMakeLists.txt

@@ -6,7 +6,7 @@ include (GNUInstallDirs)
 
 set (CMAKE_AUTOMOC ON)
 set (CMAKE_AUTORCC ON)
-set (QT_MINIMUM_VERSION "5.7.1")
+set (QT_MINIMUM_VERSION "5.10")
 
 find_package(Qt5 ${QT_MINIMUM_VERSION} CONFIG REQUIRED Widgets Svg LinguistTools)
 
@@ -133,7 +133,7 @@ install (
 
 # CPACK: General Settings
 set (CPACK_GENERATOR "TBZ2")
-set (CPACK_PACKAGE_NAME "PineapplePictures")
+set (CPACK_PACKAGE_NAME "pineapple-pictures")
 set (CPACK_PACKAGE_DESCRIPTION_SUMMARY "Yet another image viewer")
 set (CPACK_PACKAGE_VENDOR "Gary Wang")
 set (CPACK_PACKAGE_CONTACT "https://github.com/BLumia/PineapplePictures/issues/")
@@ -143,6 +143,8 @@ elseif (APPLE)
     # ...
 elseif (UNIX)
     set (CPACK_SYSTEM_NAME "${CMAKE_SYSTEM_NAME}-${CMAKE_SYSTEM_PROCESSOR}")
+    set (CPACK_DEBIAN_PACKAGE_DEPENDS "libqt5svg5")
+    set (CPACK_DEBIAN_PACKAGE_RECOMMENDS "kimageformat-plugins")
 endif()
 
 include(CPack)

README.md

@@ -3,6 +3,8 @@ Yet another image viewer.
 |CI|Build Status|
 |---|---|
 |Windows Build|[![Windows build status](https://ci.appveyor.com/api/projects/status/dbd8clww3cit6oa0/branch/master?svg=true)](https://ci.appveyor.com/project/BLumia/pineapplepictures/branch/master)|
+|macOS Build|![macOS CI](https://github.com/BLumia/PineapplePictures/workflows/macOS%20CI/badge.svg)|
+|Ubuntu 20.04 Build|![Ubuntu 20.04 CI](https://github.com/BLumia/PineapplePictures/workflows/Ubuntu%2020.04%20CI/badge.svg)|
 
 ![Pineapple Pictures - Main Window](https://repository-images.githubusercontent.com/211888654/21fb6300-269f-11ea-8e85-953e5d57da44)
 
@@ -21,6 +23,7 @@ Feel free to open up an issue to request an new language to translate.
 
  - Mixed `CR LF` and `LF`.
  - Ugly action icons.
+ - Ugly implementations.
  - For windows build, win32 APIs are used.
  - No drag-window-border-to-resize support under non-windows platforms (I use <kbd>Meta+Drag</kbd> to resize window under my x11 desktop).
 

appveyor.yml

@@ -1,27 +1,49 @@
 environment:
+  CMAKE_INSTALL_ROOT: C:\projects\cmake
   matrix:
-    - build_name: mingw73_32_qt5_12_5
+    - build_name: mingw73_32_qt5_12_6
-      QTPATH: C:\Qt\5.12.5\mingw73_32
+      QTPATH: C:\Qt\5.12.6\mingw73_32
       MINGW32: C:\Qt\Tools\mingw730_32
-#    - build_name: msvc2017_64
-#      QTPATH: C:\Qt\5.11.2\msvc2017_64
-#      MINGW32: C:\Qt\Tools\mingw530_32
 
 install:
+  - mkdir %CMAKE_INSTALL_ROOT%
   - cd %APPVEYOR_BUILD_FOLDER%
   - git submodule update --init --recursive
-  - set PATH=%PATH%;%QTPATH%\bin;%MINGW32%\bin
+  - set PATH=%PATH%;%CMAKE_INSTALL_ROOT%;%QTPATH%\bin;%MINGW32%\bin
 
 build_script:
+# prepare
+  - mkdir 3rdparty
+  - cinst ninja
+# install ECM so we can build KImageFormats
+  - cd 3rdparty
+  - git clone -q https://invent.kde.org/frameworks/extra-cmake-modules.git
+  - cd extra-cmake-modules
+  - cmake -G "Ninja" . -DCMAKE_INSTALL_PREFIX=%CMAKE_INSTALL_ROOT%
+  - cmake --build .
+  - cmake --build . --target install
+  - cd %APPVEYOR_BUILD_FOLDER%
+# install KImageFormats
+  - cd 3rdparty
+  - git clone -q https://invent.kde.org/frameworks/kimageformats.git
+  - cd kimageformats
   - mkdir build
   - cd build
-  - cmake -G "Unix Makefiles" -DCMAKE_MAKE_PROGRAM=mingw32-make -DCMAKE_INSTALL_PREFIX='%cd%' ..\
+  - cmake .. -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS_RELEASE="-s" -DCMAKE_MAKE_PROGRAM=mingw32-make -DQT_PLUGIN_INSTALL_DIR=%QTPATH%\plugins
+  - cmake --build . --config Release
+  - cmake --build . --config Release --target install
+  - cd %APPVEYOR_BUILD_FOLDER%
+# finally...
+  - mkdir build
+  - cd build
+  - cmake .. -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DCMAKE_MAKE_PROGRAM=mingw32-make -DCMAKE_INSTALL_PREFIX='%cd%'
   - mingw32-make
   - mingw32-make install
 # fixme: I don't know how to NOT make the binary installed to the ./bin/ folder...
   - cd bin
-  - windeployqt --no-quick-import --no-translations --no-opengl-sw --no-angle --no-system-d3d-compiler --release .\ppic.exe
+  - windeployqt --verbose=2 --no-quick-import --no-translations --no-opengl-sw --no-angle --no-system-d3d-compiler --release .\ppic.exe
-  - tree
+# for debug..
+  - tree /f
 
 artifacts:
   - path: build\bin

graphicsscene.cpp

@@ -60,6 +60,17 @@ void GraphicsScene::showGif(const QString &filepath)
     this->setSceneRect(m_theThing->boundingRect());
 }
 
+bool GraphicsScene::trySetTransformationMode(Qt::TransformationMode mode)
+{
+    QGraphicsPixmapItem * pixmapItem = qgraphicsitem_cast<QGraphicsPixmapItem *>(m_theThing);
+    if (pixmapItem) {
+        pixmapItem->setTransformationMode(mode);
+        return true;
+    }
+
+    return false;
+}
+
 QPixmap GraphicsScene::renderToPixmap()
 {
     QPixmap pixmap(sceneRect().toRect().size());

graphicsscene.h

@@ -15,6 +15,8 @@ public:
     void showSvg(const QString &filepath);
     void showGif(const QString &filepath);
 
+    bool trySetTransformationMode(Qt::TransformationMode mode);
+
     QPixmap renderToPixmap();
 
 private:

graphicsview.cpp

@@ -39,8 +39,10 @@ void GraphicsView::showFileFromUrl(const QUrl &url, bool doRequestGallery)
         QImageReader imageReader(filePath);
         imageReader.setAutoTransform(true);
         imageReader.setDecideFormatFromContent(true);
-        QImage::Format imageFormat = imageReader.imageFormat();
+        // Since if the image format / plugin does not support this feature, imageFormat() will returns an invalid format.
-        if (imageFormat == QImage::Format_Invalid) {
+        // So we cannot use imageFormat() and check if it returns QImage::Format_Invalid to detect if we support the file.
+        // QImage::Format imageFormat = imageReader.imageFormat();
+        if (imageReader.format().isEmpty()) {
             showText(tr("File is not a valid image"));
         } else {
             showImage(QPixmap::fromImageReader(&imageReader));
@@ -117,6 +119,7 @@ void GraphicsView::zoomView(qreal scaleFactor)
 {
     m_enableFitInView = false;
     scale(scaleFactor, scaleFactor);
+    applyTransformationModeByScaleFactor();
     emit navigatorViewRequired(!isThingSmallerThanWindowWith(transform()), m_rotateAngle);
 }
 
@@ -136,6 +139,7 @@ void GraphicsView::rotateView(qreal rotateAngel)
 void GraphicsView::fitInView(const QRectF &rect, Qt::AspectRatioMode aspectRadioMode)
 {
     QGraphicsView::fitInView(rect, aspectRadioMode);
+    applyTransformationModeByScaleFactor();
 }
 
 void GraphicsView::checkAndDoFitInView()
@@ -213,9 +217,9 @@ void GraphicsView::dragEnterEvent(QDragEnterEvent *event)
     } else {
         event->ignore();
     }
-    qDebug() << event->mimeData() << "Drag Enter Event"
+//    qDebug() << event->mimeData() << "Drag Enter Event"
-             << event->mimeData()->hasUrls() << event->mimeData()->hasImage()
+//             << event->mimeData()->hasUrls() << event->mimeData()->hasImage()
-             << event->mimeData()->formats() << event->mimeData()->hasFormat("text/uri-list");
+//             << event->mimeData()->formats() << event->mimeData()->hasFormat("text/uri-list");
 
     return QGraphicsView::dragEnterEvent(event);
 }
@@ -238,7 +242,7 @@ void GraphicsView::dropEvent(QDropEvent *event)
         if (urls.isEmpty()) {
             showText(tr("File url list is empty"));
         } else {
-            showFileFromUrl(urls.first());
+            showFileFromUrl(urls.first(), true);
         }
     } else if (mimeData->hasImage()) {
         QImage img = qvariant_cast<QImage>(mimeData->imageData());
@@ -285,9 +289,9 @@ void GraphicsView::setCheckerboardEnabled(bool enabled)
     if (m_checkerboardEnabled) {
         // Prepare background check-board pattern
         QPixmap tilePixmap(0x20, 0x20);
-        tilePixmap.fill(QColor(35, 35, 35, 110));
+        tilePixmap.fill(QColor(35, 35, 35, 170));
         QPainter tilePainter(&tilePixmap);
-        QColor color(40, 40, 40, 110);
+        QColor color(45, 45, 45, 170);
         tilePainter.fillRect(0, 0, 0x10, 0x10, color);
         tilePainter.fillRect(0x10, 0x10, 0x10, 0x10, color);
         tilePainter.end();
@@ -298,6 +302,15 @@ void GraphicsView::setCheckerboardEnabled(bool enabled)
     }
 }
 
+void GraphicsView::applyTransformationModeByScaleFactor()
+{
+    if (this->scaleFactor() < 1) {
+        scene()->trySetTransformationMode(Qt::SmoothTransformation);
+    } else {
+        scene()->trySetTransformationMode(Qt::FastTransformation);
+    }
+}
+
 void GraphicsView::resetWithScaleAndRotate(qreal scaleFactor, qreal rotateAngle)
 {
     QGraphicsView::resetTransform();

graphicsview.h

@@ -54,6 +54,7 @@ private:
     bool isThingSmallerThanWindowWith(const QTransform &transform) const;
     bool shouldIgnoreMousePressMoveEvent(const QMouseEvent *event) const;
     void setCheckerboardEnabled(bool enabled);
+    void applyTransformationModeByScaleFactor();
 
     void resetWithScaleAndRotate(qreal scaleFactor, qreal rotateAngle);
 

icons/go-next.svg

@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="75"
+   height="75"
+   viewBox="0 0 19.84375 19.843751"
+   version="1.1"
+   id="svg8"
+   inkscape:version="1.0 (4035a4fb49, 2020-05-01)"
+   sodipodi:docname="go-next.svg">
+  <defs
+     id="defs2" />
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#282929"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.76862745"
+     inkscape:pageshadow="2"
+     inkscape:zoom="16.000001"
+     inkscape:cx="35.333099"
+     inkscape:cy="37.582065"
+     inkscape:document-units="px"
+     inkscape:current-layer="layer1"
+     inkscape:document-rotation="0"
+     showgrid="false"
+     units="px"
+     inkscape:pagecheckerboard="false"
+     showguides="true"
+     inkscape:guide-bbox="true"
+     inkscape:window-width="1920"
+     inkscape:window-height="1001"
+     inkscape:window-x="-9"
+     inkscape:window-y="-9"
+     inkscape:window-maximized="1">
+    <sodipodi:guide
+       position="11.453565,9.9198082"
+       orientation="0,-1"
+       id="guide857" />
+    <sodipodi:guide
+       position="9.9229088,19.564698"
+       orientation="1,0"
+       id="guide837" />
+  </sodipodi:namedview>
+  <metadata
+     id="metadata5">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="图层 1"
+     inkscape:groupmode="layer"
+     id="layer1">
+    <ellipse
+       style="opacity:1;fill:#000000;fill-opacity:0.15678;stroke:#ffffff;stroke-width:0.396875;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       id="path849"
+       cx="9.9368067"
+       cy="9.915391"
+       rx="8.6764698"
+       ry="8.9158831" />
+    <path
+       style="fill:none;stroke:#ffffff;stroke-width:0.396875;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       d="M 8.3550725,6.9255115 11.353504,9.9239423 8.3550725,12.91402"
+       id="path867" />
+  </g>
+</svg>

icons/go-previous.svg

@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   sodipodi:docname="go-previous.svg"
+   inkscape:version="1.0 (4035a4fb49, 2020-05-01)"
+   id="svg8"
+   version="1.1"
+   viewBox="0 0 19.84375 19.843751"
+   height="75"
+   width="75">
+  <defs
+     id="defs2" />
+  <sodipodi:namedview
+     inkscape:window-maximized="1"
+     inkscape:window-y="-9"
+     inkscape:window-x="-9"
+     inkscape:window-height="1001"
+     inkscape:window-width="1920"
+     inkscape:guide-bbox="true"
+     showguides="true"
+     inkscape:pagecheckerboard="false"
+     units="px"
+     showgrid="false"
+     inkscape:document-rotation="0"
+     inkscape:current-layer="layer1"
+     inkscape:document-units="px"
+     inkscape:cy="45.995918"
+     inkscape:cx="29.794477"
+     inkscape:zoom="11.313709"
+     inkscape:pageshadow="2"
+     inkscape:pageopacity="0.76862745"
+     borderopacity="1.0"
+     bordercolor="#666666"
+     pagecolor="#282929"
+     id="base">
+    <sodipodi:guide
+       id="guide857"
+       orientation="0,-1"
+       position="11.453565,9.9198082" />
+    <sodipodi:guide
+       id="guide837"
+       orientation="1,0"
+       position="9.9229088,19.564698" />
+  </sodipodi:namedview>
+  <metadata
+     id="metadata5">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     id="layer1"
+     inkscape:groupmode="layer"
+     inkscape:label="图层 1">
+    <ellipse
+       ry="8.9158831"
+       rx="8.6764698"
+       cy="9.915391"
+       cx="9.9368067"
+       id="path849"
+       style="opacity:1;fill:#000000;fill-opacity:0.15678;stroke:#ffffff;stroke-width:0.396875;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
+    <path
+       id="path867"
+       d="M 11.494016,6.9255115 8.4955849,9.9239423 11.494016,12.91402"
+       style="fill:none;stroke:#ffffff;stroke-width:0.396875;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
+  </g>
+</svg>

mainwindow.cpp

@@ -31,6 +31,7 @@ MainWindow::MainWindow(QWidget *parent) :
     this->setAttribute(Qt::WA_TranslucentBackground, true);
     this->setMinimumSize(710, 530);
     this->setWindowIcon(QIcon(":/icons/app-icon.svg"));
+    this->setMouseTracking(true);
 
     m_fadeOutAnimation = new QPropertyAnimation(this, "windowOpacity");
     m_fadeOutAnimation->setDuration(300);
@@ -72,13 +73,29 @@ MainWindow::MainWindow(QWidget *parent) :
     connect(m_graphicsView, &GraphicsView::requestGallery,
             this, &MainWindow::loadGalleryBySingleLocalFile);
 
-    m_closeButton = new ToolButton(m_graphicsView);
+    m_closeButton = new ToolButton(true, m_graphicsView);
     m_closeButton->setIcon(QIcon(":/icons/window-close"));
     m_closeButton->setIconSize(QSize(50, 50));
 
     connect(m_closeButton, &QAbstractButton::clicked,
             this, &MainWindow::closeWindow);
 
+    m_prevButton = new ToolButton(false, m_graphicsView);
+    m_prevButton->setIcon(QIcon(":/icons/go-previous"));
+    m_prevButton->setIconSize(QSize(75, 75));
+    m_prevButton->setVisible(false);
+    m_prevButton->setOpacity(0, false);
+    m_nextButton = new ToolButton(false, m_graphicsView);
+    m_nextButton->setIcon(QIcon(":/icons/go-next"));
+    m_nextButton->setIconSize(QSize(75, 75));
+    m_nextButton->setVisible(false);
+    m_nextButton->setOpacity(0, false);
+
+    connect(m_prevButton, &QAbstractButton::clicked,
+            this, &MainWindow::galleryPrev);
+    connect(m_nextButton, &QAbstractButton::clicked,
+            this, &MainWindow::galleryNext);
+
     m_bottomButtonGroup = new BottomButtonGroup(this);
 
     connect(m_bottomButtonGroup, &BottomButtonGroup::resetToOriginalBtnClicked,
@@ -109,10 +126,19 @@ MainWindow::MainWindow(QWidget *parent) :
     m_gv->setOpacity(0, false);
     m_closeButton->setOpacity(0, false);
 
+    connect(this, &MainWindow::galleryLoaded, this, [this]() {
+        m_prevButton->setVisible(isGalleryAvailable());
+        m_nextButton->setVisible(isGalleryAvailable());
+    });
+
     QShortcut * quitAppShorucut = new QShortcut(QKeySequence(Qt::Key_Space), this);
     connect(quitAppShorucut, &QShortcut::activated,
             std::bind(&MainWindow::quitAppAction, this, false));
 
+    QShortcut * quitAppShorucut2 = new QShortcut(QKeySequence(Qt::Key_Escape), this);
+    connect(quitAppShorucut2, &QShortcut::activated,
+            std::bind(&MainWindow::quitAppAction, this, false));
+
     QShortcut * prevPictureShorucut = new QShortcut(QKeySequence(Qt::Key_PageUp), this);
     connect(prevPictureShorucut, &QShortcut::activated,
             this, &MainWindow::galleryPrev);
@@ -121,6 +147,10 @@ MainWindow::MainWindow(QWidget *parent) :
     connect(nextPictureShorucut, &QShortcut::activated,
             this, &MainWindow::galleryNext);
 
+    QShortcut * fullscreenShorucut = new QShortcut(QKeySequence(QKeySequence::FullScreen), this);
+    connect(fullscreenShorucut, &QShortcut::activated,
+            this, &MainWindow::toggleFullscreen);
+
     centerWindow();
 }
 
@@ -185,12 +215,18 @@ QUrl MainWindow::currentImageFileUrl() const
     return QUrl();
 }
 
+void MainWindow::clearGallery()
+{
+    m_currentFileIndex = -1;
+    m_files.clear();
+}
+
 void MainWindow::loadGalleryBySingleLocalFile(const QString &path)
 {
     QFileInfo info(path);
     QDir dir(info.path());
     QString currentFileName = info.fileName();
-    QStringList entryList = dir.entryList({"*.jpg", "*.jpeg", "*.png", "*.gif", "*.svg", "*.bmp"},
+    QStringList entryList = dir.entryList({"*.jpg", "*.jpeg", "*.jfif", "*.png", "*.gif", "*.svg", "*.bmp"},
                                           QDir::Files | QDir::NoSymLinks, QDir::NoSort);
 
     QCollator collator;
@@ -198,8 +234,7 @@ void MainWindow::loadGalleryBySingleLocalFile(const QString &path)
 
     std::sort(entryList.begin(), entryList.end(), collator);
 
-    m_currentFileIndex = -1;
+    clearGallery();
-    m_files.clear();
 
     for (int i = 0; i < entryList.count(); i++) {
         const QString & oneEntry = entryList.at(i);
@@ -209,13 +244,13 @@ void MainWindow::loadGalleryBySingleLocalFile(const QString &path)
         }
     }
 
-//    qDebug() << m_files << m_currentFileIndex;
+    emit galleryLoaded();
 }
 
 void MainWindow::galleryPrev()
 {
     int count = m_files.count();
-    if (m_currentFileIndex < 0 || m_files.isEmpty() || m_currentFileIndex >= m_files.count()) {
+    if (!isGalleryAvailable()) {
         return;
     }
 
@@ -227,7 +262,7 @@ void MainWindow::galleryPrev()
 void MainWindow::galleryNext()
 {
     int count = m_files.count();
-    if (m_currentFileIndex < 0 || m_files.isEmpty() || m_currentFileIndex >= m_files.count()) {
+    if (!isGalleryAvailable()) {
         return;
     }
 
@@ -236,6 +271,14 @@ void MainWindow::galleryNext()
     m_graphicsView->showFileFromUrl(m_files.at(m_currentFileIndex), false);
 }
 
+bool MainWindow::isGalleryAvailable()
+{
+    if (m_currentFileIndex < 0 || m_files.isEmpty() || m_currentFileIndex >= m_files.count()) {
+        return false;
+    }
+    return true;
+}
+
 void MainWindow::showEvent(QShowEvent *event)
 {
     updateWidgetsPosition();
@@ -249,6 +292,8 @@ void MainWindow::enterEvent(QEvent *event)
     m_gv->setOpacity(1);
 
     m_closeButton->setOpacity(1);
+    m_prevButton->setOpacity(1);
+    m_nextButton->setOpacity(1);
 
     return QMainWindow::enterEvent(event);
 }
@@ -259,6 +304,8 @@ void MainWindow::leaveEvent(QEvent *event)
     m_gv->setOpacity(0);
 
     m_closeButton->setOpacity(0);
+    m_prevButton->setOpacity(0);
+    m_nextButton->setOpacity(0);
 
     return QMainWindow::leaveEvent(event);
 }
@@ -268,8 +315,8 @@ void MainWindow::mousePressEvent(QMouseEvent *event)
     if (event->buttons() & Qt::LeftButton && !isMaximized()) {
         m_clickedOnWindow = true;
         m_oldMousePos = event->pos();
-        qDebug() << m_oldMousePos << m_graphicsView->transform().m11()
+//        qDebug() << m_oldMousePos << m_graphicsView->transform().m11()
-                 << m_graphicsView->transform().m22() << m_graphicsView->matrix().m12();
+//                 << m_graphicsView->transform().m22() << m_graphicsView->matrix().m12();
         event->accept();
     }
 
@@ -357,6 +404,7 @@ void MainWindow::contextMenuEvent(QContextMenuEvent *event)
 
     QAction * pasteImage = new QAction(tr("&Paste Image"));
     connect(pasteImage, &QAction::triggered, this, [ = ](){
+        clearGallery();
         m_graphicsView->showImage(clipboardImage);
     });
 
@@ -523,6 +571,9 @@ void MainWindow::closeWindow()
 void MainWindow::updateWidgetsPosition()
 {
     m_closeButton->move(width() - m_closeButton->width(), 0);
+    m_prevButton->move(25, (height() - m_prevButton->height()) / 2);
+    m_nextButton->move(width() - m_nextButton->width() - 25,
+                       (height() - m_prevButton->height()) / 2);
     m_bottomButtonGroup->move((width() - m_bottomButtonGroup->width()) / 2,
                               height() - m_bottomButtonGroup->height());
     m_gv->move(width() - m_gv->width(), height() - m_gv->height());
@@ -532,6 +583,8 @@ void MainWindow::toggleProtectedMode()
 {
     m_protectedMode = !m_protectedMode;
     m_closeButton->setVisible(!m_protectedMode);
+    m_prevButton->setVisible(!m_protectedMode);
+    m_nextButton->setVisible(!m_protectedMode);
 }
 
 void MainWindow::toggleStayOnTop()
@@ -551,3 +604,12 @@ void MainWindow::quitAppAction(bool force)
         closeWindow();
     }
 }
+
+void MainWindow::toggleFullscreen()
+{
+    if (isFullScreen()) {
+        showNormal();
+    } else {
+        showFullScreen();
+    }
+}

mainwindow.h

@@ -27,9 +27,14 @@ public:
     void adjustWindowSizeBySceneRect();
     QUrl currentImageFileUrl() const;
 
+    void clearGallery();
     void loadGalleryBySingleLocalFile(const QString &path);
     void galleryPrev();
     void galleryNext();
+    bool isGalleryAvailable();
+
+signals:
+    void galleryLoaded();
 
 protected slots:
     void showEvent(QShowEvent *event) override;
@@ -52,6 +57,7 @@ protected slots:
     void toggleStayOnTop();
     bool stayOnTop();
     void quitAppAction(bool force = false);
+    void toggleFullscreen();
 
 private:
     QPoint m_oldMousePos;
@@ -59,6 +65,8 @@ private:
     QPropertyAnimation *m_floatUpAnimation;
     QParallelAnimationGroup *m_exitAnimationGroup;
     ToolButton *m_closeButton;
+    ToolButton *m_prevButton;
+    ToolButton *m_nextButton;
     GraphicsView *m_graphicsView;
     NavigatorView *m_gv;
     BottomButtonGroup *m_bottomButtonGroup;

resources.qrc

@@ -8,5 +8,7 @@
         <file>icons/view-background-checkerboard.svg</file>
         <file>icons/app-icon.svg</file>
         <file>icons/window-close.svg</file>
+        <file>icons/go-next.svg</file>
+        <file>icons/go-previous.svg</file>
     </qresource>
 </RCC>

toolbutton.cpp

@@ -6,18 +6,20 @@
 #include <QGraphicsOpacityEffect>
 #include <QPropertyAnimation>
 
-ToolButton::ToolButton(QWidget *parent)
+ToolButton::ToolButton(bool hoverColor, QWidget *parent)
     : QPushButton(parent)
     , m_opacityHelper(new OpacityHelper(this))
 {
     setFlat(true);
-    setFixedSize(50, 50);
+    QString qss = "QPushButton {"
-    setStyleSheet("QPushButton {"
                   "background: transparent;"
-                  "}"
+                  "}";
-                  "QPushButton:hover {"
+    if (hoverColor) {
+        qss += "QPushButton:hover {"
                "background: red;"
-                  "}");
+               "}";
+    }
+    setStyleSheet(qss);
 }
 
 void ToolButton::setOpacity(qreal opacity, bool animated)

toolbutton.h

@@ -8,7 +8,7 @@ class ToolButton : public QPushButton
 {
     Q_OBJECT
 public:
-    ToolButton(QWidget * parent = nullptr);
+    ToolButton(bool hoverColor = false, QWidget * parent = nullptr);
 
 public slots:
     void setOpacity(qreal opacity, bool animated = true);