diff --git a/frame/item/components/appsnapshot.cpp b/frame/item/components/appsnapshot.cpp
index 21cb14c09..92ccf7e72 100644
--- a/frame/item/components/appsnapshot.cpp
+++ b/frame/item/components/appsnapshot.cpp
@@ -24,6 +24,24 @@ AppSnapshot::AppSnapshot(const WId wid, QWidget *parent)
     QTimer::singleShot(1, this, &AppSnapshot::fetchSnapshot);
 }
 
+void AppSnapshot::closeWindow() const
+{
+    const auto display = QX11Info::display();
+
+    XEvent e;
+
+    memset(&e, 0, sizeof(e));
+    e.xclient.type = ClientMessage;
+    e.xclient.window = m_wid;
+    e.xclient.message_type = XInternAtom(display, "WM_PROTOCOLS", true);
+    e.xclient.format = 32;
+    e.xclient.data.l[0] = XInternAtom(display, "WM_DELETE_WINDOW", false);
+    e.xclient.data.l[1] = CurrentTime;
+
+    XSendEvent(display, m_wid, false, NoEventMask, &e);
+    XFlush(display);
+}
+
 void AppSnapshot::fetchSnapshot()
 {
     if (!isVisible())
diff --git a/frame/item/components/appsnapshot.h b/frame/item/components/appsnapshot.h
index 700ad6c79..d5164d534 100644
--- a/frame/item/components/appsnapshot.h
+++ b/frame/item/components/appsnapshot.h
@@ -12,10 +12,15 @@ class AppSnapshot : public QWidget
 public:
     explicit AppSnapshot(const WId wid, QWidget *parent = 0);
 
+    WId wid() const { return m_wid; }
+
 signals:
     void entered(const WId wid) const;
     void clicked(const WId wid) const;
 
+public slots:
+    void closeWindow() const;
+
 private slots:
     void fetchSnapshot();
 
diff --git a/frame/item/components/floatingpreview.cpp b/frame/item/components/floatingpreview.cpp
index 559468fd9..d5902e4a6 100644
--- a/frame/item/components/floatingpreview.cpp
+++ b/frame/item/components/floatingpreview.cpp
@@ -23,6 +23,8 @@ FloatingPreview::FloatingPreview(QWidget *parent)
 
     setLayout(centralLayout);
     setFixedSize(SNAP_WIDTH, SNAP_HEIGHT);
+
+    connect(m_closeBtn, &DImageButton::clicked, this, &FloatingPreview::onCloseBtnClicked);
 }
 
 void FloatingPreview::trackWindow(AppSnapshot * const snap)
@@ -44,3 +46,10 @@ void FloatingPreview::paintEvent(QPaintEvent *e)
 
     painter.fillRect(rect(), Qt::red);
 }
+
+void FloatingPreview::onCloseBtnClicked()
+{
+    Q_ASSERT(!m_tracked.isNull());
+
+    m_tracked->closeWindow();
+}
diff --git a/frame/item/components/floatingpreview.h b/frame/item/components/floatingpreview.h
index bdd4ae0e7..6e683eb71 100644
--- a/frame/item/components/floatingpreview.h
+++ b/frame/item/components/floatingpreview.h
@@ -25,6 +25,9 @@ public slots:
 private:
     void paintEvent(QPaintEvent *e);
 
+private slots:
+    void onCloseBtnClicked();
+
 private:
     QPointer<AppSnapshot> m_tracked;