Improve performance when turning on the preview mode

[dolphin.git] / src / views / tooltips / tooltipmanager.cpp

diff --git a/src/views/tooltips/tooltipmanager.cpp b/src/views/tooltips/tooltipmanager.cpp
index 76d8882cc48ecae85f92b060c585f9829008d8c8..cb86b3355020e1c056cdc59dffec3ed4a461fcca 100644 (file)
--- a/src/views/tooltips/tooltipmanager.cpp
+++ b/src/views/tooltips/tooltipmanager.cpp
@@ -20,8 +20,10 @@
 #include "tooltipmanager.h"
 
 #include "filemetadatatooltip.h"
+#include <KConfigGroup>
 #include <KIcon>
 #include <KIO/PreviewJob>
+#include <KSharedConfig>
 
 #include <QApplication>
 #include <QDesktopWidget>
@@ -43,11 +45,13 @@ ToolTipManager::ToolTipManager(QAbstractItemView* parent,
     m_fileMetaDataToolTip(0),
     m_toolTipRequested(false),
     m_metaDataRequested(false),
+    m_appliedWaitCursor(false),
     m_item(),
-    m_itemRect()
+    m_itemRect(),
+    m_enabledPlugins()
 {
     static FileMetaDataToolTip* sharedToolTip = 0;
-    if (sharedToolTip == 0) {
+    if (!sharedToolTip) {
         sharedToolTip = new FileMetaDataToolTip();
         // TODO: Using K_GLOBAL_STATIC would be preferable to maintain the
         // instance, but the cleanup of KFileMetaDataWidget at this stage does
@@ -94,7 +98,10 @@ ToolTipManager::~ToolTipManager()
 
 void ToolTipManager::hideToolTip()
 {
-    QApplication::restoreOverrideCursor();
+    if (m_appliedWaitCursor) {
+        QApplication::restoreOverrideCursor();
+        m_appliedWaitCursor = false;
+    }
 
     m_toolTipRequested = false;
     m_metaDataRequested = false;
@@ -155,10 +162,23 @@ void ToolTipManager::startContentRetrieval()
 
     m_fileMetaDataToolTip->setName(m_item.text());
 
+    // Request the retrieval of meta-data. The slot
+    // slotMetaDataRequestFinished() is invoked after the
+    // meta-data have been received.
     m_metaDataRequested = true;
     m_fileMetaDataToolTip->setItems(KFileItemList() << m_item);
 
-    KIO::PreviewJob* job = KIO::filePreview(KFileItemList() << m_item, 256, 256);
+    // Request a preview of the item
+    m_fileMetaDataToolTip->setPreview(QPixmap());
+
+    if (m_enabledPlugins.isEmpty()) {
+        const KConfigGroup globalConfig(KGlobal::config(), "PreviewSettings");
+        m_enabledPlugins = globalConfig.readEntry("Plugins", QStringList()
+                                                             << "directorythumbnail"
+                                                             << "imagethumbnail"
+                                                             << "jpegthumbnail");
+    }
+    KIO::PreviewJob* job = KIO::filePreview(KFileItemList() << m_item, 256, 256, true, true, &m_enabledPlugins);
 
     connect(job, SIGNAL(gotPreview(const KFileItem&, const QPixmap&)),
             this, SLOT(setPreviewPix(const KFileItem&, const QPixmap&)));
@@ -213,14 +233,19 @@ void ToolTipManager::slotMetaDataRequestFinished()
 void ToolTipManager::showToolTip()
 {
     Q_ASSERT(m_toolTipRequested);
-    QApplication::restoreOverrideCursor();
+    if (m_appliedWaitCursor) {
+        QApplication::restoreOverrideCursor();
+        m_appliedWaitCursor = false;
+    }
 
     if (QApplication::mouseButtons() & Qt::LeftButton) {
         return;
     }
 
     if (m_fileMetaDataToolTip->preview().isNull() || m_metaDataRequested) {
+        Q_ASSERT(!m_appliedWaitCursor);
         QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
+        m_appliedWaitCursor = true;
         return;
     }