Write the layout

sessionfriendarea.cpp

@@ -0,0 +1,40 @@
+#include "sessionfriendarea.h"
+#include <QScrollBar>
+#include <QVBoxLayout>
+#include <QPushButton>
+
+SessionFriendArea::SessionFriendArea(QWidget *parent)
+    : QScrollArea {parent}
+{
+    //设置必要属性
+    //设置这个才能有滚动效果
+    this->setWidgetResizable(true);
+    //设置滚动条相关样式
+    this->verticalScrollBar()->setStyleSheet("QScrollBar:vertical { width: 2px; background-color: rgb(46, 46, 46); }");
+    this->horizontalScrollBar()->setStyleSheet("QScrollBar:horizontal { height: 0px; }");
+
+    // 把widget创建出来
+    container = new QWidget();
+    container->setFixedWidth(310);
+    this->setWidget(container);
+
+    //给这个widget添加布局管理器，方便后续添加元素进去
+    QVBoxLayout* layout = new QVBoxLayout();
+    layout->setContentsMargins(0, 0, 0, 0);
+    layout->setSpacing(0);
+    layout->setAlignment(Qt::AlignTop);
+    container->setLayout(layout);
+
+    // //简单测试一下滚动的效果(just for testing...)
+    // for(int i = 0; i < 50; i++) {
+    //     QPushButton* btn = new QPushButton();
+    //     QString Sbtn = "button: " + QString::number(i);
+    //     btn->setText(Sbtn);
+    //     layout->addWidget(btn);
+    // }
+}
+
+SessionFriendItem::SessionFriendItem(QWidget *owner, const QIcon *avatar, const QString *name, const QString &text)
+{
+
+}