diff --git a/frame/item/components/appsnapshot.cpp b/frame/item/components/appsnapshot.cpp
index 6ce530214..00b045dbd 100644
--- a/frame/item/components/appsnapshot.cpp
+++ b/frame/item/components/appsnapshot.cpp
@@ -42,9 +42,9 @@ AppSnapshot::AppSnapshot(const WId wid, QWidget *parent)
       m_wmHelper(DWindowManagerHelper::instance())
 {
     m_closeBtn->setFixedSize(24, 24);
-    m_closeBtn->setNormalPic(":/icons/resources/close_round_normal.png");
-    m_closeBtn->setHoverPic(":/icons/resources/close_round_hover.png");
-    m_closeBtn->setPressPic(":/icons/resources/close_round_press.png");
+    m_closeBtn->setNormalPic(":/icons/resources/close_round_normal.svg");
+    m_closeBtn->setHoverPic(":/icons/resources/close_round_hover.svg");
+    m_closeBtn->setPressPic(":/icons/resources/close_round_press.svg");
     m_closeBtn->setVisible(false);
 
     QHBoxLayout *centralLayout = new QHBoxLayout;
@@ -55,7 +55,7 @@ AppSnapshot::AppSnapshot(const WId wid, QWidget *parent)
 
     setLayout(centralLayout);
     setAcceptDrops(true);
-    setFixedSize(SNAP_WIDTH, SNAP_HEIGHT);
+    resize(SNAP_WIDTH, SNAP_HEIGHT);
 
     connect(m_closeBtn, &DImageButton::clicked, this, &AppSnapshot::closeWindow, Qt::QueuedConnection);
     connect(m_wmHelper, &DWindowManagerHelper::hasCompositeChanged, this, &AppSnapshot::compositeChanged, Qt::QueuedConnection);
diff --git a/frame/item/components/floatingpreview.cpp b/frame/item/components/floatingpreview.cpp
index e58063d81..a7888177c 100644
--- a/frame/item/components/floatingpreview.cpp
+++ b/frame/item/components/floatingpreview.cpp
@@ -76,7 +76,7 @@ void FloatingPreview::paintEvent(QPaintEvent *e)
     if (m_tracked.isNull())
         return;
 
-    const QImage snapshot = m_tracked->snapshot();
+    const QImage &snapshot = m_tracked->snapshot();
     if (snapshot.isNull())
         return;
 
diff --git a/frame/item/components/previewcontainer.cpp b/frame/item/components/previewcontainer.cpp
index c669ffd25..0cf9201c4 100644
--- a/frame/item/components/previewcontainer.cpp
+++ b/frame/item/components/previewcontainer.cpp
@@ -79,7 +79,8 @@ void PreviewContainer::setWindowInfos(const WindowDict &infos)
 
     if (m_snapshots.isEmpty())
         emit requestCancelAndHidePreview();
-        adjustSize();
+
+    adjustSize();
 }
 
 void PreviewContainer::updateSnapshots()