generic: enable thumbnail plugins by default via X-KDE-PluginInfo-EnabledByDefault entry

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>

kioslave/thumbnail/directorythumbnail.desktop

@@ -54,6 +54,7 @@ Name[x-test]=xxFoldersxx
 Name[zh_CN]=文件夹
 Name[zh_TW]=資料夾
 X-KDE-ServiceTypes=ThumbCreator
+X-KDE-PluginInfo-EnabledByDefault=true
 MimeType=inode/directory;
 CacheThumbnail=false
 HandleSequences=true

kioslave/thumbnail/imagethumbnail.desktop

@@ -72,4 +72,5 @@ Name[zh_TW]=影像（GIF、PNG、BMP...）
 X-KDE-ServiceTypes=ThumbCreator
 MimeType=image/cgm;image/fax-g3;image/gif;image/jp2;image/png;image/tiff;image/bmp;image/x-dds;image/x-ico;image/x-jng;image/x-pcx;image/x-photo-cd;image/x-portable-bitmap;image/x-portable-graymap;image/x-portable-pixmap;image/x-rgb;image/x-tga;image/x-xbitmap;image/x-xcf;image/x-xpixmap;image/x-sun-raster;image/vnd.adobe.photoshop;image/x-psd;image/x-hdr;image/x-pic;image/vnd.microsoft.icon;image/x-icon;image/x-webp;image/webp;
 X-KDE-Library=imagethumbnail
+X-KDE-PluginInfo-EnabledByDefault=true
 CacheThumbnail=true

kioslave/thumbnail/jpegthumbnail.desktop

@@ -75,6 +75,7 @@ Name[zh_TW]=JPEG 影像
 X-KDE-ServiceTypes=ThumbCreator
 MimeType=image/jpeg;
 X-KDE-Library=jpegthumbnail
+X-KDE-PluginInfo-EnabledByDefault=true
 CacheThumbnail=true
 Configurable=true
 ThumbnailerVersion=2

kioslave/thumbnail/svgthumbnail.desktop

@@ -75,4 +75,5 @@ Name[zh_TW]=SVG 影像
 X-KDE-ServiceTypes=ThumbCreator
 MimeType=image/svg+xml;image/svg+xml-compressed;
 X-KDE-Library=svgthumbnail
+X-KDE-PluginInfo-EnabledByDefault=true
 CacheThumbnail=true

plasma/applets/folderview/folderview.cpp

@@ -44,6 +44,7 @@
 #include <KTemporaryFile>
 #include <KStandardDirs>
 #include <KMenu>
+#include <KServiceTypeTrader>
 
 #include <kio/copyjob.h>
 #include <kio/fileundomanager.h>
@@ -369,6 +370,16 @@ void FolderView::init()
     // Find out about network availability changes
     connect(Solid::Networking::notifier(), SIGNAL(shouldConnect()), SLOT(networkAvailable()));
 
+    // Find out which thumbnail plugins are enabled by default
+    QStringList enabledByDefault;
+    const KService::List plugins = KServiceTypeTrader::self()->query(QLatin1String("ThumbCreator"));
+    foreach (const KSharedPtr<KService>& service, plugins) {
+        const bool enabled = service->property("X-KDE-PluginInfo-EnabledByDefault", QVariant::Bool).toBool();
+        if (enabled) {
+            enabledByDefault << service->desktopEntryName();
+        }
+    }
+
     KConfigGroup cg = config();
     m_customLabel         = cg.readEntry("customLabel", "");
     m_customIconSize      = cg.readEntry("customIconSize", 0);
@@ -379,7 +390,7 @@ void FolderView::init()
     m_iconsLocked         = cg.readEntry("iconsLocked", false);
     m_alignToGrid         = cg.readEntry("alignToGrid", false);
     m_clickToView         = cg.readEntry("clickForFolderPreviews", true);
-    m_previewPlugins      = cg.readEntry("previewPlugins", QStringList() << "imagethumbnail" << "jpegthumbnail");
+    m_previewPlugins      = cg.readEntry("previewPlugins", enabledByDefault);
     m_sortDirsFirst       = cg.readEntry("sortDirsFirst", true);
     m_sortColumn          = cg.readEntry("sortColumn", int(KDirModel::Name));
     m_sortOrder           = sortOrderStringToEnum(cg.readEntry("sortOrder", "ascending"));

plasma/applets/folderview/iconview.cpp

@@ -40,6 +40,7 @@
 #include <KIconEffect>
 #include <KStringHandler>
 #include <KFileItemDelegate>
+#include <KServiceTypeTrader>
 
 #include <KIO/NetAccess>
 
@@ -106,7 +107,13 @@ IconView::IconView(QGraphicsWidget *parent)
     m_animator = new Animator(this);
 
     // set a default for popup preview plugins
-    m_popupPreviewPlugins = QStringList() << "imagethumbnail" << "jpegthumbnail";
+    const KService::List plugins = KServiceTypeTrader::self()->query(QLatin1String("ThumbCreator"));
+    foreach (const KSharedPtr<KService>& service, plugins) {
+        const bool enabled = service->property("X-KDE-PluginInfo-EnabledByDefault", QVariant::Bool).toBool();
+        if (enabled) {
+            m_popupPreviewPlugins << service->desktopEntryName();
+        }
+    }
 
     int size = style()->pixelMetric(QStyle::PM_LargeIconSize);
     setIconSize(QSize(size, size));

plasma/applets/folderview/tooltipwidget.cpp

@@ -253,10 +253,7 @@ void ToolTipWidget::setContent()
 
 void ToolTipWidget::startPreviewJob()
 {
-    QStringList plugins;
-    plugins << "imagethumbnail" << "jpegthumbnail";
-
-    m_previewJob = KIO::filePreview(KFileItemList() << m_item, QSize(256, 256), &plugins);
+    m_previewJob = KIO::filePreview(KFileItemList() << m_item, QSize(256, 256));
     connect(m_previewJob, SIGNAL(gotPreview(KFileItem,QPixmap)), SLOT(gotPreview(KFileItem,QPixmap)));
     connect(m_previewJob, SIGNAL(finished(KJob*)), SLOT(previewJobFinished(KJob*)));
 }