From 66e13529be4fd32c3af1e1bf8c74062b8b53a90b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Du=C5=A1an=20Poizl?= <nou.spiro@gmail.com>
Date: Sun, 18 Dec 2022 10:18:01 +0100
Subject: [PATCH] Allow change of preload without restart

---
 imageringlist.cpp  | 29 +++++++++++++++++++++++++++++
 imageringlist.h    |  2 ++
 mainwindow.cpp     |  1 +
 settingsdialog.cpp |  2 ++
 settingsdialog.h   |  2 ++
 5 files changed, 36 insertions(+)

diff --git a/imageringlist.cpp b/imageringlist.cpp
index 93848e0..1526c3b 100644
--- a/imageringlist.cpp
+++ b/imageringlist.cpp
@@ -348,6 +348,35 @@ QVariant ImageRingList::headerData(int section, Qt::Orientation orientation, int
     return QVariant();
 }
 
+void ImageRingList::setPreload(int width)
+{
+    DEFAULT_WIDTH = width;
+    if(m_images.size() == 0)return;
+
+    int newWidth = DEFAULT_WIDTH<m_images.size()/2 ? DEFAULT_WIDTH : m_images.size()/2;
+    if(newWidth > m_width)
+    {
+        for(int i = newWidth - m_width; i>0; i--)
+        {
+            m_firstImage = decrement(m_firstImage);
+            (*m_firstImage)->load();
+            m_lastImage = increment(m_lastImage);
+            (*m_lastImage)->load();
+        }
+    }
+    if(newWidth < m_width)
+    {
+        for(int i = m_width - newWidth; i>0; i--)
+        {
+            (*m_firstImage)->release();
+            m_firstImage = increment(m_firstImage);
+            (*m_lastImage)->release();
+            m_lastImage = decrement(m_lastImage);
+        }
+    }
+    m_width = newWidth;
+}
+
 void ImageRingList::setFiles(const QStringList files, const QString &currentFile)
 {
     QThreadPool::globalInstance()->clear();
diff --git a/imageringlist.h b/imageringlist.h
index 5500fc9..23b209a 100644
--- a/imageringlist.h
+++ b/imageringlist.h
@@ -89,6 +89,8 @@ public:
     int columnCount(const QModelIndex &parent = QModelIndex()) const override;
     QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
     QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
+public slots:
+    void setPreload(int width);
 protected:
     void setFiles(const QStringList files, const QString &currentFile = QString());
     QList<ImagePtr>::iterator increment(QList<ImagePtr>::iterator iter);
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 6d8bb42..77219d5 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -627,6 +627,7 @@ void MainWindow::showMarkFilesDialog()
 void MainWindow::showSettingsDialog()
 {
     SettingsDialog settingsDialog(this);
+    connect(&settingsDialog, &SettingsDialog::preloadChanged, m_ringList, &ImageRingList::setPreload);
     settingsDialog.exec();
 }
 
diff --git a/settingsdialog.cpp b/settingsdialog.cpp
index 6ff969a..4295399 100644
--- a/settingsdialog.cpp
+++ b/settingsdialog.cpp
@@ -92,4 +92,6 @@ void SettingsDialog::saveSettings()
     settings.setValue("settings/preloadimagecount", m_preloadImages->value());
     settings.setValue("settings/dontusenativedialogs", m_useNativeDialog->isChecked());
     QApplication::setAttribute(Qt::AA_DontUseNativeDialogs, m_useNativeDialog->isChecked());
+    if(DEFAULT_WIDTH != m_preloadImages->value())
+        emit preloadChanged(m_preloadImages->value());
 }
diff --git a/settingsdialog.h b/settingsdialog.h
index b3a90a2..e7736ed 100644
--- a/settingsdialog.h
+++ b/settingsdialog.h
@@ -12,6 +12,8 @@ public:
     explicit SettingsDialog(QWidget *parent = nullptr);
     static void loadSettings();
     static bool loadThumbsizes();
+signals:
+    void preloadChanged(int witdth);
 private:
     void saveSettings();