diff --git a/app/src/main/java/org/solovyev/android/calculator/buttons/CppSpecialButton.java b/app/src/main/java/org/solovyev/android/calculator/buttons/CppSpecialButton.java
index ae1c4324..fba551b7 100644
--- a/app/src/main/java/org/solovyev/android/calculator/buttons/CppSpecialButton.java
+++ b/app/src/main/java/org/solovyev/android/calculator/buttons/CppSpecialButton.java
@@ -24,29 +24,30 @@ package org.solovyev.android.calculator.buttons;
 
 import org.solovyev.android.Check;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import java.util.HashMap;
 import java.util.Map;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
 // see values/text_glyphs.xml for glyph constants
 public enum CppSpecialButton {
 
-    history("history"),
+    history("history", '\ue005'),
     history_undo("↶", '\ue007'),
     history_redo("↷", '\ue008'),
-    cursor_right("▷"),
+    cursor_right("▷", '\ue003'),
     cursor_to_end(">>"),
-    cursor_left("◁"),
+    cursor_left("◁", '\ue002'),
     cursor_to_start("<<"),
     settings("settings"),
     settings_widget("settings_widget"),
-    like("like"),
+    like("like", '\ue006'),
     memory("memory"),
     memory_plus("M+"),
     memory_minus("M-"),
     memory_clear("MC"),
-    erase("erase"),
+    erase("erase", '\ue004'),
     paste("paste", '\uE000'),
     copy("copy", '\uE001'),
     brackets_wrap("(…)"),
diff --git a/app/src/main/java/org/solovyev/android/calculator/keyboard/BaseKeyboardUi.java b/app/src/main/java/org/solovyev/android/calculator/keyboard/BaseKeyboardUi.java
index f0bdf05b..ee7c45fd 100644
--- a/app/src/main/java/org/solovyev/android/calculator/keyboard/BaseKeyboardUi.java
+++ b/app/src/main/java/org/solovyev/android/calculator/keyboard/BaseKeyboardUi.java
@@ -12,21 +12,38 @@ import android.util.TypedValue;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.TextView;
-import dagger.Lazy;
+
 import org.solovyev.android.Check;
-import org.solovyev.android.calculator.*;
+import org.solovyev.android.calculator.ActivityLauncher;
+import org.solovyev.android.calculator.App;
+import org.solovyev.android.calculator.Calculator;
+import org.solovyev.android.calculator.Editor;
+import org.solovyev.android.calculator.Keyboard;
+import org.solovyev.android.calculator.Preferences;
 import org.solovyev.android.calculator.buttons.CppButton;
 import org.solovyev.android.calculator.memory.Memory;
 import org.solovyev.android.views.Adjuster;
-import org.solovyev.android.views.dragbutton.*;
+import org.solovyev.android.views.dragbutton.DirectionDragButton;
+import org.solovyev.android.views.dragbutton.DirectionDragImageButton;
+import org.solovyev.android.views.dragbutton.DirectionDragListener;
+import org.solovyev.android.views.dragbutton.DirectionDragView;
+import org.solovyev.android.views.dragbutton.Drag;
+import org.solovyev.android.views.dragbutton.DragDirection;
+import org.solovyev.android.views.dragbutton.DragEvent;
+import org.solovyev.android.views.dragbutton.DragView;
 
-import javax.annotation.Nonnull;
-import javax.inject.Inject;
 import java.util.ArrayList;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+import javax.inject.Inject;
+
+import dagger.Lazy;
+
 import static android.content.res.Configuration.ORIENTATION_PORTRAIT;
-import static android.view.HapticFeedbackConstants.*;
+import static android.view.HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING;
+import static android.view.HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING;
+import static android.view.HapticFeedbackConstants.KEYBOARD_TAP;
 import static org.solovyev.android.calculator.App.cast;
 import static org.solovyev.android.calculator.Preferences.Gui.Mode.simple;
 
@@ -111,18 +128,6 @@ public abstract class BaseKeyboardUi implements SharedPreferences.OnSharedPrefer
         textSize = calculateTextSize(activity);
     }
 
-    protected final void prepareButton(@Nullable ImageView button) {
-        prepareButton(button, IMAGE_SCALE);
-    }
-
-    protected final void prepareButton(@Nullable ImageView button, float scale) {
-        if (button == null) {
-            return;
-        }
-        prepareButton((View) button);
-        Adjuster.adjustImage(button, scale);
-    }
-
     protected final void prepareButton(@Nullable View button) {
         if (button == null) {
             return;
@@ -132,18 +137,6 @@ public abstract class BaseKeyboardUi implements SharedPreferences.OnSharedPrefer
         button.setOnClickListener(this);
     }
 
-    protected final void prepareButton(@Nullable DirectionDragImageButton button) {
-        if (button == null) {
-            return;
-        }
-        dragButtons.add(button);
-        button.setVibrateOnDrag(keyboard.isVibrateOnKeypress());
-        prepareButton((ImageView) button);
-        button.setOnDragListener(listener);
-        button.setTextSize(textSize);
-        Adjuster.adjustText(button, AdjusterHelper.instance, textScale, 0);
-    }
-
     protected final void prepareButton(@Nullable DirectionDragButton button) {
         if (button == null) {
             return;
diff --git a/app/src/main/java/org/solovyev/android/calculator/keyboard/KeyboardUi.java b/app/src/main/java/org/solovyev/android/calculator/keyboard/KeyboardUi.java
index 7c45b836..83688573 100644
--- a/app/src/main/java/org/solovyev/android/calculator/keyboard/KeyboardUi.java
+++ b/app/src/main/java/org/solovyev/android/calculator/keyboard/KeyboardUi.java
@@ -5,22 +5,24 @@ import android.app.Application;
 import android.content.SharedPreferences;
 import android.support.annotation.Nullable;
 import android.view.View;
-import android.widget.ImageButton;
-import butterknife.Bind;
-import butterknife.ButterKnife;
-import jscl.NumeralBase;
+
 import org.solovyev.android.calculator.Display;
 import org.solovyev.android.calculator.Engine;
 import org.solovyev.android.calculator.R;
 import org.solovyev.android.views.dragbutton.DirectionDragButton;
-import org.solovyev.android.views.dragbutton.DirectionDragImageButton;
 
 import javax.annotation.Nonnull;
 import javax.inject.Inject;
 
+import butterknife.Bind;
+import butterknife.ButterKnife;
+import jscl.NumeralBase;
+
 import static org.solovyev.android.calculator.Engine.Preferences.multiplicationSign;
 import static org.solovyev.android.calculator.Engine.Preferences.numeralBase;
-import static org.solovyev.android.views.dragbutton.DragDirection.*;
+import static org.solovyev.android.views.dragbutton.DragDirection.down;
+import static org.solovyev.android.views.dragbutton.DragDirection.left;
+import static org.solovyev.android.views.dragbutton.DragDirection.up;
 
 public class KeyboardUi extends BaseKeyboardUi {
 
@@ -58,7 +60,7 @@ public class KeyboardUi extends BaseKeyboardUi {
     @Bind(R.id.cpp_button_functions)
     DirectionDragButton functionsButton;
     @Bind(R.id.cpp_button_history)
-    DirectionDragImageButton historyButton;
+    DirectionDragButton historyButton;
     @Bind(R.id.cpp_button_multiplication)
     DirectionDragButton multiplicationButton;
     @Bind(R.id.cpp_button_plus)
@@ -72,14 +74,8 @@ public class KeyboardUi extends BaseKeyboardUi {
     @Bind(R.id.cpp_button_round_brackets)
     DirectionDragButton bracketsButton;
     @Nullable
-    @Bind(R.id.cpp_button_copy)
-    DirectionDragImageButton copyButton;
-    @Nullable
-    @Bind(R.id.cpp_button_paste)
-    DirectionDragImageButton pasteButton;
-    @Nullable
     @Bind(R.id.cpp_button_like)
-    ImageButton likeButton;
+    DirectionDragButton likeButton;
     @Nullable
     @Bind(R.id.cpp_button_percent)
     DirectionDragButton percentButton;
@@ -132,12 +128,6 @@ public class KeyboardUi extends BaseKeyboardUi {
         prepareButton(button8);
         prepareButton(button9);
 
-        if (copyButton != null) {
-            prepareButton(copyButton);
-        }
-        if (pasteButton != null) {
-            prepareButton(pasteButton);
-        }
         prepareButton(likeButton);
         prepareButton(memoryButton);
 
diff --git a/app/src/main/java/org/solovyev/android/calculator/keyboard/PartialKeyboardUi.java b/app/src/main/java/org/solovyev/android/calculator/keyboard/PartialKeyboardUi.java
index 94a4c58a..5fb9feb8 100644
--- a/app/src/main/java/org/solovyev/android/calculator/keyboard/PartialKeyboardUi.java
+++ b/app/src/main/java/org/solovyev/android/calculator/keyboard/PartialKeyboardUi.java
@@ -6,17 +6,17 @@ import android.content.SharedPreferences;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.view.View;
-import android.widget.ImageButton;
-import butterknife.Bind;
-import butterknife.ButterKnife;
+
 import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.view.EditorLongClickEraser;
 import org.solovyev.android.views.dragbutton.DirectionDragButton;
-import org.solovyev.android.views.dragbutton.DirectionDragImageButton;
 
 import javax.annotation.Nonnull;
 import javax.inject.Inject;
 
+import butterknife.Bind;
+import butterknife.ButterKnife;
+
 import static org.solovyev.android.calculator.Preferences.Gui.vibrateOnKeypress;
 import static org.solovyev.android.views.dragbutton.DragDirection.down;
 
@@ -24,16 +24,16 @@ public class PartialKeyboardUi extends BaseKeyboardUi {
 
     @Nullable
     @Bind(R.id.cpp_button_right)
-    DirectionDragImageButton rightButton;
+    DirectionDragButton rightButton;
     @Nullable
     @Bind(R.id.cpp_button_left)
-    DirectionDragImageButton leftButton;
+    DirectionDragButton leftButton;
     @Nullable
     @Bind(R.id.cpp_button_clear)
     DirectionDragButton clearButton;
     @Nullable
     @Bind(R.id.cpp_button_erase)
-    ImageButton eraseButton;
+    DirectionDragButton eraseButton;
     @Nullable
     @Bind(R.id.cpp_button_equals)
     DirectionDragButton equalsButton;
@@ -54,11 +54,10 @@ public class PartialKeyboardUi extends BaseKeyboardUi {
         prepareButton(equalsButton);
         prepareButton(clearButton);
         if (eraseButton != null) {
-            // backspace button is too big, scale it more
-            prepareButton(eraseButton, IMAGE_SCALE_ERASE);
+            prepareButton(eraseButton);
             longClickEraser = EditorLongClickEraser.attachTo(eraseButton, keyboard.isVibrateOnKeypress(), editor, calculator);
         }
-        if(isSimpleMode()) {
+        if (isSimpleMode()) {
             hideText(equalsButton, down);
         }
     }
diff --git a/app/src/main/res/layout/cpp_app_button_copy.xml b/app/src/main/res/layout/cpp_app_button_copy.xml
deleted file mode 100644
index abf9433b..00000000
--- a/app/src/main/res/layout/cpp_app_button_copy.xml
+++ /dev/null
@@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-
-<!--
-  ~ Copyright 2013 serso aka se.solovyev
-  ~
-  ~ Licensed under the Apache License, Version 2.0 (the "License");
-  ~ you may not use this file except in compliance with the License.
-  ~ You may obtain a copy of the License at
-  ~
-  ~    http://www.apache.org/licenses/LICENSE-2.0
-  ~
-  ~ Unless required by applicable law or agreed to in writing, software
-  ~ distributed under the License is distributed on an "AS IS" BASIS,
-  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  ~ See the License for the specific language governing permissions and
-  ~ limitations under the License.
-  ~
-  ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-  ~ Contact details
-  ~
-  ~ Email: se.solovyev@gmail.com
-  ~ Site:  http://se.solovyev.org
-  -->
-
-<org.solovyev.android.views.dragbutton.DirectionDragImageButton
-    android:id="@id/cpp_button_copy"
-    style="?attr/cpp_button_style_control"
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:src="@drawable/ic_content_copy_white_48dp" />
\ No newline at end of file
diff --git a/app/src/main/res/layout/cpp_app_button_erase.xml b/app/src/main/res/layout/cpp_app_button_erase.xml
index 1a05ca1b..5dd168f1 100644
--- a/app/src/main/res/layout/cpp_app_button_erase.xml
+++ b/app/src/main/res/layout/cpp_app_button_erase.xml
@@ -22,8 +22,8 @@
   ~ Site:  http://se.solovyev.org
   -->
 
-<ImageButton
-    xmlns:a="http://schemas.android.com/apk/res/android"
-    a:id="@id/cpp_button_erase"
+<org.solovyev.android.views.dragbutton.DirectionDragButton
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@id/cpp_button_erase"
     style="?attr/cpp_button_style_operation_highlighted"
-    a:src="@drawable/ic_backspace_white_48dp" />
\ No newline at end of file
+    android:text="@string/cpp_glyph_backspace"/>
\ No newline at end of file
diff --git a/app/src/main/res/layout/cpp_app_button_history.xml b/app/src/main/res/layout/cpp_app_button_history.xml
index a7291251..3710be8d 100644
--- a/app/src/main/res/layout/cpp_app_button_history.xml
+++ b/app/src/main/res/layout/cpp_app_button_history.xml
@@ -21,12 +21,12 @@
   ~ Email: se.solovyev@gmail.com
   ~ Site:  http://se.solovyev.org
   -->
-<org.solovyev.android.views.dragbutton.DirectionDragImageButton
+<org.solovyev.android.views.dragbutton.DirectionDragButton
     xmlns:a="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     a:id="@id/cpp_button_history"
     style="?attr/cpp_button_style_control"
-    a:src="@drawable/ic_history_white_48dp"
+    a:text="@string/cpp_glyph_history"
     app:directionTextScale="0.5"
     app:directionTextDown="@string/cpp_glyph_redo"
     app:directionTextUp="@string/cpp_glyph_undo" />
\ No newline at end of file
diff --git a/app/src/main/res/layout/cpp_app_button_left.xml b/app/src/main/res/layout/cpp_app_button_left.xml
index 845176fa..e0565d79 100644
--- a/app/src/main/res/layout/cpp_app_button_left.xml
+++ b/app/src/main/res/layout/cpp_app_button_left.xml
@@ -22,12 +22,12 @@
   ~ Site:  http://se.solovyev.org
   -->
 
-<org.solovyev.android.views.dragbutton.DirectionDragImageButton a:id="@id/cpp_button_left"
+<org.solovyev.android.views.dragbutton.DirectionDragButton a:id="@id/cpp_button_left"
     style="?attr/cpp_button_style_control"
     xmlns:a="http://schemas.android.com/apk/res/android"
     xmlns:c="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
-    a:src="@drawable/ic_keyboard_arrow_left_white_48dp"
+    a:text="@string/cpp_glyph_left"
     c:directionTextUp="&lt;&lt;"
     c:directionTextDown="@string/cpp_glyph_copy"
     tools:ignore="HardcodedText" />
\ No newline at end of file
diff --git a/app/src/main/res/layout/cpp_app_button_like.xml b/app/src/main/res/layout/cpp_app_button_like.xml
index 88497724..05363467 100644
--- a/app/src/main/res/layout/cpp_app_button_like.xml
+++ b/app/src/main/res/layout/cpp_app_button_like.xml
@@ -22,8 +22,8 @@
   ~ Site:  http://se.solovyev.org
   -->
 
-<org.solovyev.android.views.dragbutton.DirectionDragImageButton
+<org.solovyev.android.views.dragbutton.DirectionDragButton
     android:id="@id/cpp_button_like"
     style="?attr/cpp_button_style_control"
     xmlns:android="http://schemas.android.com/apk/res/android"
-    android:src="@drawable/ic_favorite_border_white_48dp" />
\ No newline at end of file
+    android:text="@string/cpp_glyph_heart"/>
\ No newline at end of file
diff --git a/app/src/main/res/layout/cpp_app_button_paste.xml b/app/src/main/res/layout/cpp_app_button_paste.xml
deleted file mode 100644
index 718e80dc..00000000
--- a/app/src/main/res/layout/cpp_app_button_paste.xml
+++ /dev/null
@@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-
-<!--
-  ~ Copyright 2013 serso aka se.solovyev
-  ~
-  ~ Licensed under the Apache License, Version 2.0 (the "License");
-  ~ you may not use this file except in compliance with the License.
-  ~ You may obtain a copy of the License at
-  ~
-  ~    http://www.apache.org/licenses/LICENSE-2.0
-  ~
-  ~ Unless required by applicable law or agreed to in writing, software
-  ~ distributed under the License is distributed on an "AS IS" BASIS,
-  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  ~ See the License for the specific language governing permissions and
-  ~ limitations under the License.
-  ~
-  ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-  ~ Contact details
-  ~
-  ~ Email: se.solovyev@gmail.com
-  ~ Site:  http://se.solovyev.org
-  -->
-
-<org.solovyev.android.views.dragbutton.DirectionDragImageButton
-    android:id="@id/cpp_button_paste"
-    style="?attr/cpp_button_style_control"
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:src="@drawable/ic_content_paste_white_48dp" />
\ No newline at end of file
diff --git a/app/src/main/res/layout/cpp_app_button_right.xml b/app/src/main/res/layout/cpp_app_button_right.xml
index f5d9d2c3..36d755b0 100644
--- a/app/src/main/res/layout/cpp_app_button_right.xml
+++ b/app/src/main/res/layout/cpp_app_button_right.xml
@@ -22,12 +22,12 @@
   ~ Site:  http://se.solovyev.org
   -->
 
-<org.solovyev.android.views.dragbutton.DirectionDragImageButton a:id="@id/cpp_button_right"
+<org.solovyev.android.views.dragbutton.DirectionDragButton android:id="@id/cpp_button_right"
     style="?attr/cpp_button_style_control"
-    xmlns:a="http://schemas.android.com/apk/res/android"
-    xmlns:c="http://schemas.android.com/apk/res-auto"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
-    a:src="@drawable/ic_keyboard_arrow_right_white_48dp"
-    c:directionTextUp="&gt;&gt;"
-    c:directionTextDown="@string/cpp_glyph_paste"
+    android:text="@string/cpp_glyph_right"
+    app:directionTextUp="&gt;&gt;"
+    app:directionTextDown="@string/cpp_glyph_paste"
     tools:ignore="HardcodedText" />
\ No newline at end of file