make the size grip being inside the background

ChannelListWidget.cpp

@@ -10,7 +10,7 @@ ChannelTree::ChannelTree(ChannelListWidget * widget, QWidget *parent)
 
 	setHeaderHidden(true);
 	setExpandsOnDoubleClick(false);
-	setStyleSheet("padding:2px;border-radius:5px;border-style:solid;border-width:1px;border-color:rgb(100,100,100); background-color:rgba(50,50,50,150); color:rgb(255,255,255);");
+	setStyleSheet("border-style:none; background-color:rgba(0,0,0,0); color:rgb(255,255,255);");
 	setSizeAdjustPolicy(QAbstractScrollArea::AdjustToContents);
 
 }
@@ -55,6 +55,9 @@ ChannelListWidget::ChannelListWidget(QWidget *parent)
 	setWindowFlags(Qt::WindowStaysOnTopHint | Qt::FramelessWindowHint | Qt::SplashScreen);
 	move(320, 200);
 
+	m_background = new QLabel(this);
+	m_background->setStyleSheet("padding:2px;border-radius:5px;border-style:solid;border-width:1px;border-color:rgb(100,100,100); background-color:rgba(50,50,50,150);");
+
 	QVBoxLayout* layout = new QVBoxLayout(this);
 	layout->setMargin(0);
 	layout->setSpacing(0);
@@ -72,6 +75,7 @@ ChannelListWidget::~ChannelListWidget()
 {
 	delete m_child;
 	delete m_grip;
+	delete m_background;
 }
 
 QTreeWidget * ChannelListWidget::getTree()
@@ -83,5 +87,6 @@ void ChannelListWidget::resizeEvent(QResizeEvent *event)
 {
 	QWidget::resizeEvent(event);
 
-	m_child->resize(size());
+	m_child->resize(m_child->size() - (event->oldSize() - event->size()));
+	m_background->resize(size());
 }

ChannelListWidget.h

@@ -3,6 +3,7 @@
 #include <QPoint>
 #include <QTreeWidget>
 #include <QSizeGrip>
+#include <QLabel>
 
 class ChannelListWidget;
 
@@ -39,6 +40,7 @@ public:
 private:
 	ChannelTree *m_child;
 	QSizeGrip *m_grip;
+	QLabel *m_background;
 
 protected:
 	virtual void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE;