revert: remove the ability that disable built-in close window animation

no need to preserve this option because frameless window and
close window animation will be fully removed in future.

app/mainwindow.cpp

@@ -75,7 +75,11 @@ MainWindow::MainWindow(QWidget *parent)
     m_exitAnimationGroup->addAnimation(m_fadeOutAnimation);
     m_exitAnimationGroup->addAnimation(m_floatUpAnimation);
     connect(m_exitAnimationGroup, &QParallelAnimationGroup::finished,
-            this, &MainWindow::doCloseWindow);
+#ifdef Q_OS_MAC
+            this, &QWidget::hide);
+#else
+            this, &QWidget::close);
+#endif
 
     GraphicsScene * scene = new GraphicsScene(this);
 
@@ -592,16 +596,12 @@ void MainWindow::centerWindow()
 
 void MainWindow::closeWindow()
 {
-    if (Settings::instance()->useBuiltInCloseAnimation()) {
     QRect windowRect(this->geometry());
     m_floatUpAnimation->setStartValue(windowRect);
     m_floatUpAnimation->setEndValue(windowRect.adjusted(0, -80, 0, 0));
     m_floatUpAnimation->setStartValue(QRect(this->geometry().x(), this->geometry().y(), this->geometry().width(), this->geometry().height()));
     m_floatUpAnimation->setEndValue(QRect(this->geometry().x(), this->geometry().y()-80, this->geometry().width(), this->geometry().height()));
     m_exitAnimationGroup->start();
-    } else {
-        doCloseWindow();
-    }
 }
 
 void MainWindow::updateWidgetsPosition()
@@ -925,15 +925,6 @@ void MainWindow::on_actionQuitApp_triggered()
     quitAppAction(false);
 }
 
-void MainWindow::doCloseWindow()
-{
-#ifdef Q_OS_MAC
-    this->hide();
-#else
-    this->close();
-#endif
-}
-
 bool MainWindow::updateFileWatcher(const QString &basePath)
 {
     m_fileSystemWatcher->removePaths(m_fileSystemWatcher->files());

app/mainwindow.h

@@ -106,8 +106,6 @@ private slots:
     void on_actionLocateInFileManager_triggered();
     void on_actionQuitApp_triggered();
 
-    void doCloseWindow();
-
 private:
     bool updateFileWatcher(const QString & basePath = QString());
     void updateGalleryButtonsVisibility();

app/settings.cpp

@@ -50,11 +50,6 @@ bool Settings::stayOnTop() const
     return m_qsettings->value("stay_on_top", true).toBool();
 }
 
-bool Settings::useBuiltInCloseAnimation() const
-{
-    return m_qsettings->value("use_built_in_close_animation", true).toBool();
-}
-
 bool Settings::useLightCheckerboard() const
 {
     return m_qsettings->value("use_light_checkerboard", false).toBool();
@@ -112,12 +107,6 @@ void Settings::setStayOnTop(bool on)
     m_qsettings->sync();
 }
 
-void Settings::setUseBuiltInCloseAnimation(bool on)
-{
-    m_qsettings->setValue("use_built_in_close_animation", on);
-    m_qsettings->sync();
-}
-
 void Settings::setUseLightCheckerboard(bool light)
 {
     m_qsettings->setValue("use_light_checkerboard", light);

app/settings.h

@@ -35,7 +35,6 @@ public:
     static Settings *instance();
 
     bool stayOnTop() const;
-    bool useBuiltInCloseAnimation() const;
     bool useLightCheckerboard() const;
     bool loopGallery() const;
     bool svgTiny12Only() const;
@@ -45,7 +44,6 @@ public:
     Qt::HighDpiScaleFactorRoundingPolicy hiDpiScaleFactorBehavior() const;
 
     void setStayOnTop(bool on);
-    void setUseBuiltInCloseAnimation(bool on);
     void setUseLightCheckerboard(bool light);
     void setLoopGallery(bool on);
     void setSvgTiny12Only(bool on);

app/settingsdialog.cpp

@@ -20,7 +20,6 @@
 SettingsDialog::SettingsDialog(QWidget *parent)
     : QDialog(parent)
     , m_stayOnTop(new QCheckBox)
-    , m_useBuiltInCloseAnimation(new QCheckBox)
     , m_useLightCheckerboard(new QCheckBox)
     , m_loopGallery(new QCheckBox)
     , m_svgTiny12Only(new QCheckBox)
@@ -121,7 +120,6 @@ SettingsDialog::SettingsDialog(QWidget *parent)
     }
 
     settingsForm->addRow(tr("Stay on top when start-up"), m_stayOnTop);
-    settingsForm->addRow(tr("Use built-in close window animation"), m_useBuiltInCloseAnimation);
     settingsForm->addRow(tr("Use light-color checkerboard"), m_useLightCheckerboard);
     settingsForm->addRow(tr("Loop the loaded gallery"), m_loopGallery);
     settingsForm->addRow(tr("Limit SVG support to SVG Tiny 1.2"), m_svgTiny12Only);
@@ -131,7 +129,6 @@ SettingsDialog::SettingsDialog(QWidget *parent)
     settingsForm->addRow(tr("HiDPI scale factor rounding policy"), m_hiDpiRoundingPolicyBehavior);
 
     m_stayOnTop->setChecked(Settings::instance()->stayOnTop());
-    m_useBuiltInCloseAnimation->setChecked(Settings::instance()->useBuiltInCloseAnimation());
     m_useLightCheckerboard->setChecked(Settings::instance()->useLightCheckerboard());
     m_loopGallery->setChecked(Settings::instance()->loopGallery());
     m_svgTiny12Only->setChecked(Settings::instance()->svgTiny12Only());
@@ -165,10 +162,6 @@ SettingsDialog::SettingsDialog(QWidget *parent)
         Settings::instance()->setStayOnTop(state == Qt::Checked);
     });
 
-    connect(m_useBuiltInCloseAnimation, &QCHECKBOX_CHECKSTATECHANGED, this, [ = ](QT_CHECKSTATE state){
-        Settings::instance()->setUseBuiltInCloseAnimation(state == Qt::Checked);
-    });
-
     connect(m_useLightCheckerboard, &QCHECKBOX_CHECKSTATECHANGED, this, [ = ](QT_CHECKSTATE state){
         Settings::instance()->setUseLightCheckerboard(state == Qt::Checked);
     });

app/settingsdialog.h

@@ -23,7 +23,6 @@ public slots:
 
 private:
     QCheckBox * m_stayOnTop = nullptr;
-    QCheckBox * m_useBuiltInCloseAnimation = nullptr;
     QCheckBox * m_useLightCheckerboard = nullptr;
     QCheckBox * m_loopGallery = nullptr;
     QCheckBox * m_svgTiny12Only = nullptr;