diff --git a/README.md b/README.md
index d8f63d26..1cd13adb 100755
--- a/README.md
+++ b/README.md
@@ -83,7 +83,7 @@
 # **Building CDROID:**
 * 1.install dependencs: sudo apt install build-essential cmake gdb pkg-config zip gettext libx11-dev
 * 2.install vcpkg
-* 3.install cdroid deplibs:  vcpkg install libzip cairo
+* 3.install cdroid deplibs:  vcpkg install gtest jsoncpp libunibreak libjpeg-turbo[jpeg8] libzip cairo
 * 4.create buildings:./build.sh --port=x64
 * 5.enter buildout directory and make the cdroid project
   
diff --git a/apps/w9/R.h b/apps/w9/R.h
index d4474f55..d075810d 100644
--- a/apps/w9/R.h
+++ b/apps/w9/R.h
@@ -1,6 +1,6 @@
 #pragma once
 
-/*Generated by machine ,Do not edit!!!*/
+/*Generated by machine ,Do not edit !!!*/
 
 namespace w9{
 
diff --git a/src/gui/view/view.cc b/src/gui/view/view.cc
index c5eaeee8..c89e3a40 100755
--- a/src/gui/view/view.cc
+++ b/src/gui/view/view.cc
@@ -2264,31 +2264,33 @@ void View::onDrawScrollBars(Canvas& canvas){
 #endif	
         // Do not draw horizontal scroll bars for round wearable devices.
     } else if ( drawVerticalScrollBar || drawHorizontalScrollBar) {
-        Rect& bounds = mScrollCache->mScrollBarBounds;
         ScrollBarDrawable* scrollBar = mScrollCache->scrollBar;
         if (drawHorizontalScrollBar) {
             scrollBar->setParameters(computeHorizontalScrollRange(),
                computeHorizontalScrollOffset(),computeHorizontalScrollExtent(), false);
+            Rect& bounds = mScrollCache->mScrollBarBounds;
             getHorizontalScrollBarBounds(&bounds, nullptr);
-            onDrawHorizontalScrollBar(canvas,scrollBar, bounds.left, bounds.top,bounds.width, bounds.height);
+            onDrawHorizontalScrollBar(canvas,scrollBar, bounds);
+            if (bInvalidate) invalidate(bounds);
         }
         if (drawVerticalScrollBar) {
             scrollBar->setParameters(computeVerticalScrollRange(),
                 computeVerticalScrollOffset(),computeVerticalScrollExtent(), true);
+            Rect& bounds = mScrollCache->mScrollBarBounds;
             getVerticalScrollBarBounds(&bounds, nullptr);
-            onDrawVerticalScrollBar(canvas, scrollBar, bounds.left, bounds.top,bounds.width, bounds.height);
+            onDrawVerticalScrollBar(canvas, scrollBar, bounds);
+            if (bInvalidate) invalidate(bounds);
         }
-        if (bInvalidate) invalidate(mScrollCache->mScrollBarBounds);
     }
 }
 
-void View::onDrawHorizontalScrollBar(Canvas& canvas, Drawable* scrollBar,int l, int t, int w, int h){
-    scrollBar->setBounds(l, t, w, h);
-    scrollBar->draw(canvas);
+void View::onDrawHorizontalScrollBar(Canvas& canvas, Drawable* scrollBar,const Rect&rect){
+    scrollBar->setBounds(rect);
+    scrollBar->draw(canvas);LOGD("onDrawHorizontalScrollBar(%d,%d,%d,%d)",rect.left,rect.top,rect.width,rect.height);
 }
 
-void View::onDrawVerticalScrollBar (Canvas& canvas , Drawable* scrollBar,int l, int t, int w, int h){
-    scrollBar->setBounds(l, t, w, h);
+void View::onDrawVerticalScrollBar (Canvas& canvas , Drawable* scrollBar,const Rect&rect){
+    scrollBar->setBounds(rect);
     scrollBar->draw(canvas);
 }
 
@@ -5879,8 +5881,8 @@ bool View::handleScrollBarDragging(MotionEvent& event) {
         }
         if (mScrollCache->mScrollBarDraggingState
                 == ScrollabilityCache::DRAGGING_HORIZONTAL_SCROLL_BAR) {
-            Rect bounds = mScrollCache->mScrollBarBounds;
-                    getHorizontalScrollBarBounds(&bounds, nullptr);
+            Rect& bounds = mScrollCache->mScrollBarBounds;
+            getHorizontalScrollBarBounds(&bounds, nullptr);
             int range = computeHorizontalScrollRange();
             int offset = computeHorizontalScrollOffset();
             int extent = computeHorizontalScrollExtent();
diff --git a/src/gui/view/view.h b/src/gui/view/view.h
index 7ebe7816..31d8cec7 100755
--- a/src/gui/view/view.h
+++ b/src/gui/view/view.h
@@ -614,8 +614,8 @@ protected:
     virtual void getScrollIndicatorBounds(Rect&);
     virtual void onDrawScrollIndicators(Canvas& canvas);
     virtual void onDrawScrollBars(Canvas& canvas);
-    void onDrawHorizontalScrollBar(Canvas& canvas, Drawable* scrollBar,int l, int t, int w, int h);
-    void onDrawVerticalScrollBar (Canvas& canvas , Drawable* scrollBar,int l, int t, int w, int h);
+    void onDrawHorizontalScrollBar(Canvas& canvas, Drawable* scrollBar,const Rect&);
+    void onDrawVerticalScrollBar (Canvas& canvas , Drawable* scrollBar,const Rect&);
 
     void ensureTransformationInfo();
 public: