Qt: use primary screen size divided by 8 for grid item size

ui/drivers/qt/ui_qt_window.cpp

@@ -2823,6 +2823,8 @@ GridItem* MainWindow::doDeferredImageLoad(GridItem *item, QString path)
 void MainWindow::addPlaylistItemsToGrid(QString pathString)
 {
    QList<QHash<QString, QString> > items = getPlaylistItems(pathString);
+   QScreen *screen = qApp->primaryScreen();
+   QSize screenSize = screen->size();
    settings_t *settings = config_get_ptr();
    int i = 0;
 
@@ -2833,12 +2835,14 @@ void MainWindow::addPlaylistItemsToGrid(QString pathString)
       ThumbnailLabel *label = NULL;
       QString thumbnailFileNameNoExt;
       QLabel *newLabel = NULL;
+      QSize thumbnailWidgetSizeHint(screenSize.width() / 8, screenSize.height() / 8);
 
       thumbnailFileNameNoExt = hash["label_noext"];
       thumbnailFileNameNoExt.replace(m_fileSanitizerRegex, "_");
 
       item->hash = hash;
       item->widget = new ThumbnailWidget();
+      item->widget->setSizeHint(thumbnailWidgetSizeHint);
       item->widget->setFixedSize(item->widget->sizeHint());
       item->widget->setLayout(new QVBoxLayout());
       item->widget->setStyleSheet("background-color: #555555");

ui/drivers/ui_qt.cpp

@@ -57,6 +57,7 @@ typedef struct ui_companion_qt
 
 ThumbnailWidget::ThumbnailWidget(QWidget *parent) :
    QWidget(parent)
+   ,m_sizeHint(QSize(256, 256))
 {
 }
 
@@ -80,7 +81,12 @@ void ThumbnailWidget::resizeEvent(QResizeEvent *event)
 
 QSize ThumbnailWidget::sizeHint() const
 {
-   return QSize(256, 256);
+   return m_sizeHint;
+}
+
+void ThumbnailWidget::setSizeHint(QSize size)
+{
+   m_sizeHint = size;
 }
 
 ThumbnailLabel::ThumbnailLabel(QWidget *parent) :

ui/drivers/ui_qt.h

@@ -83,6 +83,9 @@ class ThumbnailWidget : public QWidget
 public:
    ThumbnailWidget(QWidget *parent = 0);
    QSize sizeHint() const;
+   void setSizeHint(QSize size);
+private:
+   QSize m_sizeHint;
 protected:
    void paintEvent(QPaintEvent *event);
    void resizeEvent(QResizeEvent *event);