diff --git a/src/main.cpp b/src/main.cpp
index 5e04e35e..aa6fc1d3 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -25,19 +25,19 @@ int main(int argc, char ** argv)
     // https://gist.github.com/QuantumCD/6245215
     qApp->setStyle(QStyleFactory::create("Fusion"));
     QPalette darkPalette;
-    darkPalette.setColor(QPalette::Window, QColor(0x25,0x25,0x25));
-    darkPalette.setColor(QPalette::WindowText, QColor(239,239,239));
+    darkPalette.setColor(QPalette::Window, Theme::black);
+    darkPalette.setColor(QPalette::WindowText, Theme::white);
     darkPalette.setColor(QPalette::Base, QColor(25,25,25));
     darkPalette.setColor(QPalette::AlternateBase, QColor(53,53,53));
-    darkPalette.setColor(QPalette::ToolTipBase, Qt::white);
-    darkPalette.setColor(QPalette::ToolTipText, Qt::white);
-    darkPalette.setColor(QPalette::Text, Qt::white);
+    darkPalette.setColor(QPalette::ToolTipBase, Theme::white);
+    darkPalette.setColor(QPalette::ToolTipText, Theme::white);
+    darkPalette.setColor(QPalette::Text, Theme::white);
     darkPalette.setColor(QPalette::Button, QColor(53,53,53));
-    darkPalette.setColor(QPalette::ButtonText, QColor(239,239,239));
-    darkPalette.setColor(QPalette::BrightText, Qt::red);
+    darkPalette.setColor(QPalette::ButtonText, Theme::white);
+    darkPalette.setColor(QPalette::BrightText, Theme::red);
     darkPalette.setColor(QPalette::Link, QColor(42, 130, 218));
     darkPalette.setColor(QPalette::Highlight, Theme::white);
-    darkPalette.setColor(QPalette::HighlightedText, Qt::white);
+    darkPalette.setColor(QPalette::HighlightedText, Theme::black);
     qApp->setPalette(darkPalette);
     qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #fc6621; border: 1px solid white; }");
     
diff --git a/src/skeletongraphicswidget.cpp b/src/skeletongraphicswidget.cpp
index 83481928..f9f4ef64 100644
--- a/src/skeletongraphicswidget.cpp
+++ b/src/skeletongraphicswidget.cpp
@@ -5,6 +5,7 @@
 #include <QtGlobal>
 #include <algorithm>
 #include <QVector2D>
+#include <QMenu>
 #include "skeletongraphicswidget.h"
 #include "theme.h"
 #include "util.h"
@@ -55,6 +56,48 @@ SkeletonGraphicsWidget::SkeletonGraphicsWidget(const SkeletonDocument *document)
     scene()->setSceneRect(rect());
     
     setMouseTracking(true);
+    
+    setContextMenuPolicy(Qt::CustomContextMenu);
+    connect(this, &SkeletonGraphicsWidget::customContextMenuRequested, this, &SkeletonGraphicsWidget::showContextMenu);
+}
+
+void SkeletonGraphicsWidget::showContextMenu(const QPoint &pos)
+{
+    if (SkeletonDocumentEditMode::Add == m_document->editMode) {
+        emit setEditMode(SkeletonDocumentEditMode::Select);
+        return;
+    }
+    
+    if (SkeletonDocumentEditMode::Select != m_document->editMode) {
+        return;
+    }
+    
+    QMenu contextMenu(this);
+    
+    QAction addAction("Add..", this);
+    connect(&addAction, &QAction::triggered, [=]() {
+        emit setEditMode(SkeletonDocumentEditMode::Add);
+    });
+    contextMenu.addAction(&addAction);
+    contextMenu.addSeparator();
+    
+    QAction deleteAction("Delete", this);
+    connect(&deleteAction, &QAction::triggered, this, &SkeletonGraphicsWidget::deleteSelected);
+    deleteAction.setEnabled(!m_rangeSelectionSet.empty());
+    contextMenu.addAction(&deleteAction);
+    contextMenu.addSeparator();
+    
+    QAction selectAllAction("Select All", this);
+    connect(&selectAllAction, &QAction::triggered, this, &SkeletonGraphicsWidget::selectAll);
+    selectAllAction.setEnabled(!nodeItemMap.empty());
+    contextMenu.addAction(&selectAllAction);
+    
+    QAction unselectAllAction("Unselect All", this);
+    connect(&unselectAllAction, &QAction::triggered, this, &SkeletonGraphicsWidget::unselectAll);
+    unselectAllAction.setEnabled(!m_rangeSelectionSet.empty());
+    contextMenu.addAction(&unselectAllAction);
+
+    contextMenu.exec(mapToGlobal(pos));
 }
 
 void SkeletonGraphicsWidget::updateItems()
@@ -525,22 +568,28 @@ bool SkeletonGraphicsWidget::mouseDoubleClick(QMouseEvent *event)
     return false;
 }
 
+void SkeletonGraphicsWidget::deleteSelected()
+{
+    if (!m_rangeSelectionSet.empty()) {
+        std::set<QUuid> nodeIdSet;
+        std::set<QUuid> edgeIdSet;
+        readSkeletonNodeAndEdgeIdSetFromRangeSelection(&nodeIdSet, &edgeIdSet);
+        for (const auto &id: edgeIdSet) {
+            emit removeEdge(id);
+        }
+        for (const auto &id: nodeIdSet) {
+            emit removeNode(id);
+        }
+    }
+}
+
 bool SkeletonGraphicsWidget::keyPress(QKeyEvent *event)
 {
     if (event->key() == Qt::Key_Delete || event->key() ==Qt::Key_Backspace) {
         bool processed = false;
         if (!m_rangeSelectionSet.empty()) {
-            std::set<QUuid> nodeIdSet;
-            std::set<QUuid> edgeIdSet;
-            readSkeletonNodeAndEdgeIdSetFromRangeSelection(&nodeIdSet, &edgeIdSet);
-            for (const auto &id: edgeIdSet) {
-                emit removeEdge(id);
-                processed = true;
-            }
-            for (const auto &id: nodeIdSet) {
-                emit removeNode(id);
-                processed = true;
-            }
+            deleteSelected();
+            processed = true;
         }
         if (processed) {
             emit groupOperationAdded();
@@ -854,3 +903,31 @@ void SkeletonGraphicsWidget::readSkeletonNodeAndEdgeIdSetFromRangeSelection(std:
     }
 }
 
+void SkeletonGraphicsWidget::selectAll()
+{
+    unselectAll();
+    SkeletonProfile choosenProfile = SkeletonProfile::Main;
+    if (m_hoveredNodeItem) {
+        choosenProfile = m_hoveredNodeItem->profile();
+    } else if (m_hoveredEdgeItem) {
+        choosenProfile = m_hoveredEdgeItem->profile();
+    }
+    for (const auto &it: nodeItemMap) {
+        SkeletonGraphicsNodeItem *item = SkeletonProfile::Main == choosenProfile ? it.second.first : it.second.second;
+        checkSkeletonItem(item, true);
+        m_rangeSelectionSet.insert(item);
+    }
+    for (const auto &it: edgeItemMap) {
+        SkeletonGraphicsEdgeItem *item = SkeletonProfile::Main == choosenProfile ? it.second.first : it.second.second;
+        checkSkeletonItem(item, true);
+        m_rangeSelectionSet.insert(item);
+    }
+}
+
+void SkeletonGraphicsWidget::unselectAll()
+{
+    for (const auto &item: m_rangeSelectionSet) {
+        checkSkeletonItem(item, false);
+    }
+    m_rangeSelectionSet.clear();
+}
diff --git a/src/skeletongraphicswidget.h b/src/skeletongraphicswidget.h
index 7096e3ae..04ebd4f0 100644
--- a/src/skeletongraphicswidget.h
+++ b/src/skeletongraphicswidget.h
@@ -296,6 +296,10 @@ public slots:
     void editModeChanged();
     void updateCursor();
     void partVisibleStateChanged(QUuid partId);
+    void showContextMenu(const QPoint &pos);
+    void deleteSelected();
+    void selectAll();
+    void unselectAll();
 private slots:
     void turnaroundImageReady();
 private:
diff --git a/src/theme.cpp b/src/theme.cpp
index c46f6b7e..112e1ca7 100644
--- a/src/theme.cpp
+++ b/src/theme.cpp
@@ -18,6 +18,7 @@ QColor Theme::red = QColor(0xfc, 0x66, 0x21);
 QColor Theme::green = QColor(0xaa, 0xeb, 0xc4);
 QColor Theme::blue = QColor(0x2a, 0x5a, 0xac);
 QColor Theme::white = QColor(0xf7, 0xd9, 0xc8);
+QColor Theme::black = QColor(0x25,0x25,0x25);
 float Theme::normalAlpha = 96.0 / 255;
 float Theme::branchAlpha = 64.0 / 255;
 float Theme::checkedAlpha = 1.0;
diff --git a/src/theme.h b/src/theme.h
index 35dc9092..4a762ed9 100644
--- a/src/theme.h
+++ b/src/theme.h
@@ -12,6 +12,7 @@ public:
     static QColor green;
     static QColor blue;
     static QColor white;
+    static QColor black;
     static float normalAlpha;
     static float checkedAlpha;
     static float branchAlpha;