diff --git a/src/iuniversalentry.h b/src/iuniversalentry.h
index 1c7425f2..a2587050 100644
--- a/src/iuniversalentry.h
+++ b/src/iuniversalentry.h
@@ -103,6 +103,11 @@ public:
         m_widgetParent = p_parent;
     }
 
+    virtual void expandCollapseAll(int p_id)
+    {
+        Q_UNUSED(p_id);
+    }
+
 signals:
     void widgetUpdated();
 
diff --git a/src/utils/vutils.cpp b/src/utils/vutils.cpp
index 71b6a201..8fcfe717 100644
--- a/src/utils/vutils.cpp
+++ b/src/utils/vutils.cpp
@@ -1540,28 +1540,6 @@ QStringList VUtils::parseCombinedArgString(const QString &p_program)
     return args;
 }
 
-const QTreeWidgetItem *VUtils::topLevelTreeItem(const QTreeWidgetItem *p_item)
-{
-    if (!p_item) {
-        return NULL;
-    }
-
-    if (p_item->parent()) {
-        return topLevelTreeItem(p_item->parent());
-    } else {
-        return p_item;
-    }
-}
-
-int VUtils::childIndexOfTreeItem(const QTreeWidgetItem *p_item)
-{
-    if (p_item->parent()) {
-        return p_item->parent()->indexOfChild(const_cast<QTreeWidgetItem *>(p_item));
-    } else {
-        return 0;
-    }
-}
-
 QImage VUtils::imageFromFile(const QString &p_filePath)
 {
     QImage img;
diff --git a/src/utils/vutils.h b/src/utils/vutils.h
index 7bf5803a..0b6dcbfb 100644
--- a/src/utils/vutils.h
+++ b/src/utils/vutils.h
@@ -333,10 +333,6 @@ public:
     // From QProcess code.
     static QStringList parseCombinedArgString(const QString &p_program);
 
-    static const QTreeWidgetItem *topLevelTreeItem(const QTreeWidgetItem *p_item);
-
-    static int childIndexOfTreeItem(const QTreeWidgetItem *p_item);
-
     // Read QImage from local file @p_filePath.
     // Directly calling QImage(p_filePath) will judge the image format from the suffix,
     // resulting a null image in wrong suffix case.
diff --git a/src/vconstants.h b/src/vconstants.h
index 09184502..6fba82e4 100644
--- a/src/vconstants.h
+++ b/src/vconstants.h
@@ -80,6 +80,15 @@ namespace SnippetConfig
     static const QString c_autoIndent = "auto_indent";
 }
 
+namespace Shortcut
+{
+    static const QString c_expand = "Ctrl+B";
+    static const QString c_info = "F2";
+    static const QString c_copy = "Ctrl+C";
+    static const QString c_cut = "Ctrl+X";
+    static const QString c_paste = "Ctrl+V";
+}
+
 static const QString c_emptyHeaderName = "[EMPTY]";
 
 enum class TextDecoration
diff --git a/src/vdirectorytree.cpp b/src/vdirectorytree.cpp
index a9f682a2..2a246325 100644
--- a/src/vdirectorytree.cpp
+++ b/src/vdirectorytree.cpp
@@ -20,11 +20,6 @@ extern VMainWindow *g_mainWin;
 extern VConfigManager *g_config;
 extern VNote *g_vnote;
 
-const QString VDirectoryTree::c_infoShortcutSequence = "F2";
-const QString VDirectoryTree::c_copyShortcutSequence = "Ctrl+C";
-const QString VDirectoryTree::c_cutShortcutSequence = "Ctrl+X";
-const QString VDirectoryTree::c_pasteShortcutSequence = "Ctrl+V";
-
 VDirectoryTree::VDirectoryTree(QWidget *parent)
     : VTreeWidget(parent),
       VNavigationMode(),
@@ -49,28 +44,28 @@ VDirectoryTree::VDirectoryTree(QWidget *parent)
 
 void VDirectoryTree::initShortcuts()
 {
-    QShortcut *infoShortcut = new QShortcut(QKeySequence(c_infoShortcutSequence), this);
+    QShortcut *infoShortcut = new QShortcut(QKeySequence(Shortcut::c_info), this);
     infoShortcut->setContext(Qt::WidgetWithChildrenShortcut);
     connect(infoShortcut, &QShortcut::activated,
             this, [this](){
                 editDirectoryInfo();
             });
 
-    QShortcut *copyShortcut = new QShortcut(QKeySequence(c_copyShortcutSequence), this);
+    QShortcut *copyShortcut = new QShortcut(QKeySequence(Shortcut::c_copy), this);
     copyShortcut->setContext(Qt::WidgetWithChildrenShortcut);
     connect(copyShortcut, &QShortcut::activated,
             this, [this](){
                 copySelectedDirectories();
             });
 
-    QShortcut *cutShortcut = new QShortcut(QKeySequence(c_cutShortcutSequence), this);
+    QShortcut *cutShortcut = new QShortcut(QKeySequence(Shortcut::c_cut), this);
     cutShortcut->setContext(Qt::WidgetWithChildrenShortcut);
     connect(cutShortcut, &QShortcut::activated,
             this, [this](){
                 cutSelectedDirectories();
             });
 
-    QShortcut *pasteShortcut = new QShortcut(QKeySequence(c_pasteShortcutSequence), this);
+    QShortcut *pasteShortcut = new QShortcut(QKeySequence(Shortcut::c_paste), this);
     pasteShortcut->setContext(Qt::WidgetWithChildrenShortcut);
     connect(pasteShortcut, &QShortcut::activated,
             this, [this](){
@@ -389,7 +384,7 @@ void VDirectoryTree::contextMenuRequested(QPoint pos)
         menu.addAction(deleteDirAct);
 
         QAction *copyAct = new QAction(VIconUtils::menuIcon(":/resources/icons/copy.svg"),
-                                       tr("&Copy\t%1").arg(VUtils::getShortcutText(c_copyShortcutSequence)),
+                                       tr("&Copy\t%1").arg(VUtils::getShortcutText(Shortcut::c_copy)),
                                        &menu);
         copyAct->setToolTip(tr("Copy selected folders"));
         connect(copyAct, &QAction::triggered,
@@ -397,7 +392,7 @@ void VDirectoryTree::contextMenuRequested(QPoint pos)
         menu.addAction(copyAct);
 
         QAction *cutAct = new QAction(VIconUtils::menuIcon(":/resources/icons/cut.svg"),
-                                      tr("C&ut\t%1").arg(VUtils::getShortcutText(c_cutShortcutSequence)),
+                                      tr("C&ut\t%1").arg(VUtils::getShortcutText(Shortcut::c_cut)),
                                       &menu);
         cutAct->setToolTip(tr("Cut selected folders"));
         connect(cutAct, &QAction::triggered,
@@ -411,7 +406,7 @@ void VDirectoryTree::contextMenuRequested(QPoint pos)
         }
 
         QAction *pasteAct = new QAction(VIconUtils::menuIcon(":/resources/icons/paste.svg"),
-                                        tr("&Paste\t%1").arg(VUtils::getShortcutText(c_pasteShortcutSequence)),
+                                        tr("&Paste\t%1").arg(VUtils::getShortcutText(Shortcut::c_paste)),
                                         &menu);
         pasteAct->setToolTip(tr("Paste folders in this folder"));
         connect(pasteAct, &QAction::triggered,
@@ -445,7 +440,7 @@ void VDirectoryTree::contextMenuRequested(QPoint pos)
         menu.addAction(pinToHistoryAct);
 
         QAction *dirInfoAct = new QAction(VIconUtils::menuIcon(":/resources/icons/dir_info.svg"),
-                                          tr("&Info (Rename)\t%1").arg(VUtils::getShortcutText(c_infoShortcutSequence)),
+                                          tr("&Info (Rename)\t%1").arg(VUtils::getShortcutText(Shortcut::c_info)),
                                           &menu);
         dirInfoAct->setToolTip(tr("View and edit current folder's information"));
         connect(dirInfoAct, &QAction::triggered,
diff --git a/src/vdirectorytree.h b/src/vdirectorytree.h
index f2a9a03f..355c35cc 100644
--- a/src/vdirectorytree.h
+++ b/src/vdirectorytree.h
@@ -163,11 +163,6 @@ private:
 
     // Magic number for clipboard operations.
     int m_magicForClipboard;
-
-    static const QString c_infoShortcutSequence;
-    static const QString c_copyShortcutSequence;
-    static const QString c_cutShortcutSequence;
-    static const QString c_pasteShortcutSequence;
 };
 
 inline QPointer<VDirectory> VDirectoryTree::getVDirectory(QTreeWidgetItem *p_item) const
diff --git a/src/vfilelist.cpp b/src/vfilelist.cpp
index f1174e6b..85248a75 100644
--- a/src/vfilelist.cpp
+++ b/src/vfilelist.cpp
@@ -26,11 +26,6 @@ extern VConfigManager *g_config;
 extern VNote *g_vnote;
 extern VMainWindow *g_mainWin;
 
-const QString VFileList::c_infoShortcutSequence = "F2";
-const QString VFileList::c_copyShortcutSequence = "Ctrl+C";
-const QString VFileList::c_cutShortcutSequence = "Ctrl+X";
-const QString VFileList::c_pasteShortcutSequence = "Ctrl+V";
-
 VFileList::VFileList(QWidget *parent)
     : QWidget(parent),
       VNavigationMode(),
@@ -119,28 +114,28 @@ void VFileList::setupUI()
 
 void VFileList::initShortcuts()
 {
-    QShortcut *infoShortcut = new QShortcut(QKeySequence(c_infoShortcutSequence), this);
+    QShortcut *infoShortcut = new QShortcut(QKeySequence(Shortcut::c_info), this);
     infoShortcut->setContext(Qt::WidgetWithChildrenShortcut);
     connect(infoShortcut, &QShortcut::activated,
             this, [this](){
                 fileInfo();
             });
 
-    QShortcut *copyShortcut = new QShortcut(QKeySequence(c_copyShortcutSequence), this);
+    QShortcut *copyShortcut = new QShortcut(QKeySequence(Shortcut::c_copy), this);
     copyShortcut->setContext(Qt::WidgetWithChildrenShortcut);
     connect(copyShortcut, &QShortcut::activated,
             this, [this](){
                 copySelectedFiles();
             });
 
-    QShortcut *cutShortcut = new QShortcut(QKeySequence(c_cutShortcutSequence), this);
+    QShortcut *cutShortcut = new QShortcut(QKeySequence(Shortcut::c_cut), this);
     cutShortcut->setContext(Qt::WidgetWithChildrenShortcut);
     connect(cutShortcut, &QShortcut::activated,
             this, [this](){
                 cutSelectedFiles();
             });
 
-    QShortcut *pasteShortcut = new QShortcut(QKeySequence(c_pasteShortcutSequence), this);
+    QShortcut *pasteShortcut = new QShortcut(QKeySequence(Shortcut::c_paste), this);
     pasteShortcut->setContext(Qt::WidgetWithChildrenShortcut);
     connect(pasteShortcut, &QShortcut::activated,
             this, [this](){
@@ -605,7 +600,7 @@ void VFileList::contextMenuRequested(QPoint pos)
         menu.addAction(deleteFileAct);
 
         QAction *copyAct = new QAction(VIconUtils::menuIcon(":/resources/icons/copy.svg"),
-                                       tr("&Copy\t%1").arg(VUtils::getShortcutText(c_copyShortcutSequence)),
+                                       tr("&Copy\t%1").arg(VUtils::getShortcutText(Shortcut::c_copy)),
                                        &menu);
         copyAct->setToolTip(tr("Copy selected notes"));
         connect(copyAct, &QAction::triggered,
@@ -613,7 +608,7 @@ void VFileList::contextMenuRequested(QPoint pos)
         menu.addAction(copyAct);
 
         QAction *cutAct = new QAction(VIconUtils::menuIcon(":/resources/icons/cut.svg"),
-                                      tr("C&ut\t%1").arg(VUtils::getShortcutText(c_cutShortcutSequence)),
+                                      tr("C&ut\t%1").arg(VUtils::getShortcutText(Shortcut::c_cut)),
                                       &menu);
         cutAct->setToolTip(tr("Cut selected notes"));
         connect(cutAct, &QAction::triggered,
@@ -627,7 +622,7 @@ void VFileList::contextMenuRequested(QPoint pos)
         }
 
         QAction *pasteAct = new QAction(VIconUtils::menuIcon(":/resources/icons/paste.svg"),
-                                        tr("&Paste\t%1").arg(VUtils::getShortcutText(c_pasteShortcutSequence)),
+                                        tr("&Paste\t%1").arg(VUtils::getShortcutText(Shortcut::c_paste)),
                                         &menu);
         pasteAct->setToolTip(tr("Paste notes in current folder"));
         connect(pasteAct, &QAction::triggered,
@@ -686,7 +681,7 @@ void VFileList::contextMenuRequested(QPoint pos)
 
         if (selectedSize == 1) {
             QAction *fileInfoAct = new QAction(VIconUtils::menuIcon(":/resources/icons/note_info.svg"),
-                                               tr("&Info (Rename)\t%1").arg(VUtils::getShortcutText(c_infoShortcutSequence)),
+                                               tr("&Info (Rename)\t%1").arg(VUtils::getShortcutText(Shortcut::c_info)),
                                                &menu);
             fileInfoAct->setToolTip(tr("View and edit current note's information"));
             connect(fileInfoAct, SIGNAL(triggered(bool)),
diff --git a/src/vfilelist.h b/src/vfilelist.h
index 2b6ac9a3..2a90821f 100644
--- a/src/vfilelist.h
+++ b/src/vfilelist.h
@@ -209,11 +209,6 @@ private:
     QListWidgetItem *m_itemClicked;
 
     VFile *m_fileToCloseInSingleClick;
-
-    static const QString c_infoShortcutSequence;
-    static const QString c_copyShortcutSequence;
-    static const QString c_cutShortcutSequence;
-    static const QString c_pasteShortcutSequence;
 };
 
 inline void VFileList::setEditArea(VEditArea *editArea)
diff --git a/src/vhelpue.cpp b/src/vhelpue.cpp
index 7b81f02e..894c0b6c 100644
--- a/src/vhelpue.cpp
+++ b/src/vhelpue.cpp
@@ -69,6 +69,7 @@ bool VHelpUE::initListWidget()
         m_listWidget->addItem(tr("Ctrl+K: Go to previous item"));
         m_listWidget->addItem(tr("Ctrl+L: Go to current item's parent item"));
         m_listWidget->addItem(tr("Ctrl+I: Expand/Collapse current item"));
+        m_listWidget->addItem(tr("Ctrl+B: Expand/Collapse all items"));
         m_listWidget->addItem(tr("Ctrl+S: Sort items"));
         m_listWidget->addItem(tr("Enter: Activate current item"));
         m_listWidget->addItem(tr("Ctrl+M: Browse current item folder or the folder containing current item"));
diff --git a/src/voutlineue.cpp b/src/voutlineue.cpp
index c159661b..1e995341 100644
--- a/src/voutlineue.cpp
+++ b/src/voutlineue.cpp
@@ -55,7 +55,7 @@ void VOutlineUE::init()
 
     connect(m_treeWidget, SIGNAL(itemActivated(QTreeWidgetItem *, int)),
             this, SLOT(activateItem(QTreeWidgetItem *, int)));
-    connect(m_treeWidget, &VTreeWidget::itemExpanded,
+    connect(m_treeWidget, &VTreeWidget::itemExpandedOrCollapsed,
             this, &VOutlineUE::widgetUpdated);
 }
 
@@ -90,12 +90,7 @@ void VOutlineUE::processCommand(int p_id, const QString &p_cmd)
             const VTableOfContent &outline = tab->getOutline();
             VOutline::updateTreeFromOutline(m_treeWidget, outline);
 
-            // expandAll() has some bugs with the first item. Fix it.
-            if (m_treeWidget->topLevelItemCount() > 0) {
-                m_treeWidget->topLevelItem(0)->setExpanded(true);
-            }
-
-            m_treeWidget->expandAll();
+            VTreeWidget::expandCollapseAll(m_treeWidget);
 
             const VHeaderPointer &header = tab->getCurrentHeader();
             if (outline.isMatched(header)) {
@@ -154,7 +149,7 @@ void VOutlineUE::updateWidget()
             delete item;
         }
 
-        wid = m_listWidget;
+        wid = m_treeWidget;
     }
 
     wid->updateGeometry();
@@ -252,3 +247,11 @@ void VOutlineUE::toggleItemExpanded(int p_id)
         }
     }
 }
+
+void VOutlineUE::expandCollapseAll(int p_id)
+{
+    Q_UNUSED(p_id);
+    if (m_listOutline) {
+        VTreeWidget::expandCollapseAll(m_treeWidget);
+    }
+}
diff --git a/src/voutlineue.h b/src/voutlineue.h
index dba3de78..4f1ebe70 100644
--- a/src/voutlineue.h
+++ b/src/voutlineue.h
@@ -35,6 +35,8 @@ public:
 
     void toggleItemExpanded(int p_id) Q_DECL_OVERRIDE;
 
+    void expandCollapseAll(int p_id) Q_DECL_OVERRIDE;
+
 protected:
     void init() Q_DECL_OVERRIDE;
 
diff --git a/src/vsearcher.cpp b/src/vsearcher.cpp
index 7ded6055..d81ca7b4 100644
--- a/src/vsearcher.cpp
+++ b/src/vsearcher.cpp
@@ -17,6 +17,7 @@
 #include "vnote.h"
 #include "vconfigmanager.h"
 #include "vexplorer.h"
+#include "vconstants.h"
 
 extern VMainWindow *g_mainWin;
 
@@ -216,6 +217,11 @@ void VSearcher::setupUI()
                 updateNumLabel(p_count);
             });
 
+    QShortcut *expandShortcut = new QShortcut(QKeySequence(Shortcut::c_expand), this);
+    expandShortcut->setContext(Qt::WidgetWithChildrenShortcut);
+    connect(expandShortcut, &QShortcut::activated,
+            m_results, &VSearchResultTree::expandCollapseAll);
+
     QFormLayout *formLayout = VUtils::getFormLayout();
     formLayout->addRow(tr("Keywords:"), m_keywordCB);
     formLayout->addRow(tr("Scope:"), m_searchScopeCB);
diff --git a/src/vsearchresulttree.cpp b/src/vsearchresulttree.cpp
index 80b67b9c..3083695b 100644
--- a/src/vsearchresulttree.cpp
+++ b/src/vsearchresulttree.cpp
@@ -13,6 +13,7 @@
 #include "vexplorer.h"
 #include "vuniversalentry.h"
 #include "vsearchue.h"
+#include "vconstants.h"
 
 extern VNote *g_vnote;
 
@@ -33,45 +34,12 @@ VSearchResultTree::VSearchResultTree(QWidget *p_parent)
     m_folderIcon = VIconUtils::treeViewIcon(":/resources/icons/dir_item.svg");
     m_notebookIcon = VIconUtils::treeViewIcon(":/resources/icons/notebook_item.svg");
 
-    initActions();
-
     connect(this, &VTreeWidget::itemActivated,
             this, &VSearchResultTree::activateItem);
     connect(this, &VTreeWidget::customContextMenuRequested,
             this, &VSearchResultTree::handleContextMenuRequested);
 }
 
-void VSearchResultTree::initActions()
-{
-    m_openAct = new QAction(tr("&Open"), this);
-    m_openAct->setToolTip(tr("Open selected notes"));
-    connect(m_openAct, &QAction::triggered,
-            this, [this]() {
-                activateItem(currentItem());
-            });
-
-    m_locateAct = new QAction(VIconUtils::menuIcon(":/resources/icons/locate_note.svg"),
-                              tr("&Locate To Folder"),
-                              this);
-    m_locateAct->setToolTip(tr("Locate the folder of current note"));
-    connect(m_locateAct, &QAction::triggered,
-            this, &VSearchResultTree::locateCurrentItem);
-
-    m_addToCartAct = new QAction(VIconUtils::menuIcon(":/resources/icons/cart.svg"),
-                                 tr("Add To Cart"),
-                                 this);
-    m_addToCartAct->setToolTip(tr("Add selected notes to Cart for further processing"));
-    connect(m_addToCartAct, &QAction::triggered,
-            this, &VSearchResultTree::addSelectedItemsToCart);
-
-    m_pinToHistoryAct = new QAction(VIconUtils::menuIcon(":/resources/icons/pin.svg"),
-                                    tr("Pin To History"),
-                                    this);
-    m_pinToHistoryAct->setToolTip(tr("Pin selected notes to History"));
-    connect(m_pinToHistoryAct, &QAction::triggered,
-            this, &VSearchResultTree::pinSelectedItemsToHistory);
-}
-
 void VSearchResultTree::updateResults(const QList<QSharedPointer<VSearchResultItem> > &p_items)
 {
     clearResults();
@@ -158,14 +126,15 @@ void VSearchResultTree::appendItem(const QSharedPointer<VSearchResultItem> &p_it
 
 void VSearchResultTree::handleContextMenuRequested(QPoint p_pos)
 {
-    QTreeWidgetItem *item = itemAt(p_pos);
-    if (!item) {
-        return;
-    }
-
     QMenu menu(this);
     menu.setToolTipsVisible(true);
 
+    QTreeWidgetItem *item = itemAt(p_pos);
+    if (!item) {
+        goto global;
+    }
+
+    {
     QList<QTreeWidgetItem *> items = selectedItems();
 
     bool hasNote = false;
@@ -177,19 +146,59 @@ void VSearchResultTree::handleContextMenuRequested(QPoint p_pos)
     }
 
     if (items.size() == 1) {
-        menu.addAction(m_openAct);
+        QAction *openAct = new QAction(tr("&Open"), &menu);
+        openAct->setToolTip(tr("Open selected notes"));
+        connect(openAct, &QAction::triggered,
+                this, [this]() {
+                    activateItem(currentItem());
+                });
+        menu.addAction(openAct);
 
         if (hasNote) {
-            menu.addAction(m_locateAct);
+            QAction *locateAct = new QAction(VIconUtils::menuIcon(":/resources/icons/locate_note.svg"),
+                                             tr("&Locate To Folder"),
+                                             &menu);
+            locateAct->setToolTip(tr("Locate the folder of current note"));
+            connect(locateAct, &QAction::triggered,
+                    this, &VSearchResultTree::locateCurrentItem);
+            menu.addAction(locateAct);
         }
     }
 
     if (hasNote) {
-        menu.addAction(m_addToCartAct);
-        menu.addAction(m_pinToHistoryAct);
+        QAction *addToCartAct = new QAction(VIconUtils::menuIcon(":/resources/icons/cart.svg"),
+                                            tr("Add To Cart"),
+                                            &menu);
+        addToCartAct->setToolTip(tr("Add selected notes to Cart for further processing"));
+        connect(addToCartAct, &QAction::triggered,
+                this, &VSearchResultTree::addSelectedItemsToCart);
+        menu.addAction(addToCartAct);
+
+        QAction *pinToHistoryAct = new QAction(VIconUtils::menuIcon(":/resources/icons/pin.svg"),
+                                               tr("Pin To History"),
+                                               &menu);
+        pinToHistoryAct->setToolTip(tr("Pin selected notes to History"));
+        connect(pinToHistoryAct, &QAction::triggered,
+                this, &VSearchResultTree::pinSelectedItemsToHistory);
+        menu.addAction(pinToHistoryAct);
+    }
     }
 
-    menu.exec(mapToGlobal(p_pos));
+global:
+    if (topLevelItemCount() > 0) {
+        if (item) {
+            menu.addSeparator();
+        }
+
+        QString shortcutText = VUtils::getShortcutText(Shortcut::c_expand);
+        QAction *expandAct = new QAction(tr("Expand/Collapse All\t%1").arg(shortcutText),
+                                         &menu);
+        connect(expandAct, &QAction::triggered,
+                this, &VSearchResultTree::expandCollapseAll);
+        menu.addAction(expandAct);
+
+        menu.exec(mapToGlobal(p_pos));
+    }
 }
 
 void VSearchResultTree::locateCurrentItem()
@@ -257,7 +266,7 @@ VSearchResultItem::ItemType VSearchResultTree::itemResultType(const QTreeWidgetI
 const QSharedPointer<VSearchResultItem> &VSearchResultTree::itemResultData(const QTreeWidgetItem *p_item) const
 {
     Q_ASSERT(p_item);
-    const QTreeWidgetItem *topItem = VUtils::topLevelTreeItem(p_item);
+    const QTreeWidgetItem *topItem = VTreeWidget::topLevelTreeItem(p_item);
     int idx = topItem->data(0, Qt::UserRole).toInt();
     Q_ASSERT(idx >= 0 && idx < m_data.size());
     return m_data[idx];
@@ -269,5 +278,10 @@ void VSearchResultTree::activateItem(const QTreeWidgetItem *p_item) const
         return;
     }
 
-    VSearchUE::activateItem(itemResultData(p_item), VUtils::childIndexOfTreeItem(p_item));
+    VSearchUE::activateItem(itemResultData(p_item), VTreeWidget::childIndexOfTreeItem(p_item));
+}
+
+void VSearchResultTree::expandCollapseAll()
+{
+    VTreeWidget::expandCollapseAll(this);
 }
diff --git a/src/vsearchresulttree.h b/src/vsearchresulttree.h
index f6e1216e..41c46952 100644
--- a/src/vsearchresulttree.h
+++ b/src/vsearchresulttree.h
@@ -6,8 +6,6 @@
 #include "vtreewidget.h"
 #include "vsearch.h"
 
-class QAction;
-
 
 class VSearchResultTree : public VTreeWidget
 {
@@ -26,6 +24,8 @@ public slots:
 
     void handleContextMenuRequested(QPoint p_pos);
 
+    void expandCollapseAll();
+
 signals:
     void countChanged(int p_count);
 
@@ -39,8 +39,6 @@ private slots:
 private:
     void appendItem(const QSharedPointer<VSearchResultItem> &p_item);
 
-    void initActions();
-
     VSearchResultItem::ItemType itemResultType(const QTreeWidgetItem *p_item) const;
 
     void activateItem(const QTreeWidgetItem *p_item) const;
@@ -52,14 +50,6 @@ private:
     QIcon m_noteIcon;
     QIcon m_folderIcon;
     QIcon m_notebookIcon;
-
-    QAction *m_openAct;
-
-    QAction *m_locateAct;
-
-    QAction *m_addToCartAct;
-
-    QAction *m_pinToHistoryAct;
 };
 
 #endif // VSEARCHRESULTTREE_H
diff --git a/src/vsearchue.cpp b/src/vsearchue.cpp
index 755825bf..79a613f7 100644
--- a/src/vsearchue.cpp
+++ b/src/vsearchue.cpp
@@ -131,7 +131,7 @@ void VSearchUE::init()
     m_treeWidget->hide();
     connect(m_treeWidget, SIGNAL(itemActivated(QTreeWidgetItem *, int)),
             this, SLOT(activateItem(QTreeWidgetItem *, int)));
-    connect(m_treeWidget, &VTreeWidget::itemExpanded,
+    connect(m_treeWidget, &VTreeWidget::itemExpandedOrCollapsed,
             this, &VSearchUE::widgetUpdated);
 }
 
@@ -905,7 +905,7 @@ const QSharedPointer<VSearchResultItem> &VSearchUE::itemResultData(const QListWi
 const QSharedPointer<VSearchResultItem> &VSearchUE::itemResultData(const QTreeWidgetItem *p_item) const
 {
     Q_ASSERT(p_item);
-    const QTreeWidgetItem *topItem = VUtils::topLevelTreeItem(p_item);
+    const QTreeWidgetItem *topItem = VTreeWidget::topLevelTreeItem(p_item);
     int idx = topItem->data(0, Qt::UserRole).toInt();
     Q_ASSERT(idx >= 0 && idx < m_data.size());
     return m_data[idx];
@@ -1002,7 +1002,7 @@ void VSearchUE::activateItem(QTreeWidgetItem *p_item, int p_col)
     }
 
     emit requestHideUniversalEntry();
-    activateItem(itemResultData(p_item), VUtils::childIndexOfTreeItem(p_item));
+    activateItem(itemResultData(p_item), VTreeWidget::childIndexOfTreeItem(p_item));
 }
 
 void VSearchUE::selectNextItem(int p_id, bool p_forward)
@@ -1122,6 +1122,25 @@ void VSearchUE::toggleItemExpanded(int p_id)
     }
 }
 
+void VSearchUE::expandCollapseAll(int p_id)
+{
+    switch (p_id) {
+    case ID::Content_Note_AllNotebook:
+    case ID::Content_Note_CurrentNotebook:
+    case ID::Content_Note_CurrentFolder:
+    case ID::Content_Note_ExplorerDirectory:
+    case ID::Content_Note_Buffer:
+    case ID::Outline_Note_Buffer:
+    {
+        VTreeWidget::expandCollapseAll(m_treeWidget);
+        break;
+    }
+
+    default:
+        break;
+    }
+}
+
 void VSearchUE::sort(int p_id)
 {
     static bool noteFirst = false;
diff --git a/src/vsearchue.h b/src/vsearchue.h
index 9df04c53..f3c5ed97 100644
--- a/src/vsearchue.h
+++ b/src/vsearchue.h
@@ -95,6 +95,8 @@ public:
 
     static void activateItem(const QSharedPointer<VSearchResultItem> &p_item, int p_matchIndex = 0);
 
+    void expandCollapseAll(int p_id) Q_DECL_OVERRIDE;
+
 protected:
     void init() Q_DECL_OVERRIDE;
 
diff --git a/src/vtreewidget.cpp b/src/vtreewidget.cpp
index f51475ce..1f77164b 100644
--- a/src/vtreewidget.cpp
+++ b/src/vtreewidget.cpp
@@ -47,18 +47,22 @@ VTreeWidget::VTreeWidget(QWidget *p_parent)
     m_delegate = new VStyledItemDelegate(NULL, this);
     setItemDelegate(m_delegate);
 
+    m_expandTimer = new QTimer(this);
+    m_expandTimer->setSingleShot(true);
+    m_expandTimer->setInterval(100);
+    connect(m_expandTimer, &QTimer::timeout,
+            this, [this]() {
+                if (m_fitContent) {
+                    resizeColumnToContents(0);
+                }
+
+                emit itemExpandedOrCollapsed();
+            });
+
     connect(this, &VTreeWidget::itemExpanded,
-            this, [this]() {
-                if (m_fitContent) {
-                    resizeColumnToContents(0);
-                }
-            });
+            m_expandTimer, static_cast<void(QTimer::*)(void)>(&QTimer::start));
     connect(this, &VTreeWidget::itemCollapsed,
-            this, [this]() {
-                if (m_fitContent) {
-                    resizeColumnToContents(0);
-                }
-            });
+            m_expandTimer, static_cast<void(QTimer::*)(void)>(&QTimer::start));
 }
 
 void VTreeWidget::keyPressEvent(QKeyEvent *p_event)
@@ -349,3 +353,88 @@ void VTreeWidget::selectParentItem()
         }
     }
 }
+
+static bool isItemTreeExpanded(const QTreeWidgetItem *p_item)
+{
+    if (!p_item) {
+        return true;
+    }
+
+    if (p_item->isHidden() || !p_item->isExpanded()) {
+        return false;
+    }
+
+    int cnt = p_item->childCount();
+    for (int i = 0; i < cnt; ++i) {
+        if (!isItemTreeExpanded(p_item->child(i))) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool VTreeWidget::isTreeExpanded(const QTreeWidget *p_tree)
+{
+    int cnt = p_tree->topLevelItemCount();
+    for (int i = 0; i < cnt; ++i) {
+        if (!isItemTreeExpanded(p_tree->topLevelItem(i))) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+void VTreeWidget::expandCollapseAll(QTreeWidget *p_tree)
+{
+    QTreeWidgetItem *topLevelItem = NULL;
+    QTreeWidgetItem *item = p_tree->currentItem();
+    if (item) {
+        topLevelItem = const_cast<QTreeWidgetItem *>(topLevelTreeItem(item));
+    }
+
+    bool expanded = isTreeExpanded(p_tree);
+    if (expanded) {
+        p_tree->collapseAll();
+    } else {
+        p_tree->expandAll();
+
+    }
+
+    VTreeWidget *vtree = dynamic_cast<VTreeWidget *>(p_tree);
+    if (vtree) {
+        if (vtree->m_fitContent) {
+            vtree->resizeColumnToContents(0);
+        }
+
+        emit vtree->itemExpandedOrCollapsed();
+    }
+
+    if (topLevelItem) {
+        p_tree->setCurrentItem(topLevelItem, 0, QItemSelectionModel::ClearAndSelect);
+        p_tree->scrollToItem(topLevelItem);
+    }
+}
+
+const QTreeWidgetItem *VTreeWidget::topLevelTreeItem(const QTreeWidgetItem *p_item)
+{
+    if (!p_item) {
+        return NULL;
+    }
+
+    if (p_item->parent()) {
+        return topLevelTreeItem(p_item->parent());
+    } else {
+        return p_item;
+    }
+}
+
+int VTreeWidget::childIndexOfTreeItem(const QTreeWidgetItem *p_item)
+{
+    if (p_item->parent()) {
+        return p_item->parent()->indexOfChild(const_cast<QTreeWidgetItem *>(p_item));
+    } else {
+        return 0;
+    }
+}
diff --git a/src/vtreewidget.h b/src/vtreewidget.h
index 516422e3..7007771f 100644
--- a/src/vtreewidget.h
+++ b/src/vtreewidget.h
@@ -50,6 +50,15 @@ public:
                                      QTreeWidgetItem *p_item,
                                      bool p_forward);
 
+    // Whether @p_tree is expanded.
+    static bool isTreeExpanded(const QTreeWidget *p_tree);
+
+    static void expandCollapseAll(QTreeWidget *p_tree);
+
+    static const QTreeWidgetItem *topLevelTreeItem(const QTreeWidgetItem *p_item);
+
+    static int childIndexOfTreeItem(const QTreeWidgetItem *p_item);
+
 protected:
     void keyPressEvent(QKeyEvent *p_event) Q_DECL_OVERRIDE;
 
@@ -61,6 +70,8 @@ signals:
     // Rows [@p_first, @p_last] were moved to @p_row.
     void rowsMoved(int p_first, int p_last, int p_row);
 
+    void itemExpandedOrCollapsed();
+
 private slots:
     void handleSearchModeTriggered(bool p_inSearchMode, bool p_focus);
 
@@ -81,6 +92,7 @@ private:
     VStyledItemDelegate *m_delegate;
 
     QTimer *m_searchColdTimer;
+    QTimer *m_expandTimer;
 
     bool m_fitContent;
 };
diff --git a/src/vuniversalentry.cpp b/src/vuniversalentry.cpp
index 25b7b774..dcd2e20b 100644
--- a/src/vuniversalentry.cpp
+++ b/src/vuniversalentry.cpp
@@ -413,6 +413,18 @@ void VUniversalEntry::keyPressEvent(QKeyEvent *p_event)
 
         break;
 
+    case Qt::Key_B:
+        if (VUtils::isControlModifierForVim(modifiers)) {
+            // Ctrl+B to expand/collapse all the items.
+            if (m_lastEntry) {
+                m_lastEntry->m_entry->expandCollapseAll(m_lastEntry->m_id);
+            }
+
+            return;
+        }
+
+        break;
+
     default:
         break;
     }