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效果：

        上下收缩、折叠面板，类似QQ好友列表那种。原理就是在一个布局中，通过button来实现一个独立widget的visible/disable

实现：

        1.分组按钮        

#ifndef EXPANDPANEL_H
#define EXPANDPANEL_H#include <QWidget>class QLabel;
class ExpandPanel : public QWidget
{Q_OBJECT
public:ExpandPanel(QWidget* parent=nullptr);void setTitle(const QString& title);signals:void statuChanged(bool expand);protected:void mousePressEvent(QMouseEvent *event);private:QLabel* logo;QLabel* title;QLabel* icon;bool mExpand = true;
};#endif // EXPANDPANEL_H#include "expandpanel.h"
#include "parse/parsework.h"#include <QDebug>
#include <QLabel>
#include <QVariant>
#include <QHBoxLayout>
#include <QStyle>
ExpandPanel::ExpandPanel(QWidget *parent):QWidget(parent)
{            logo = new QLabel;logo->setObjectName("logo");title = new QLabel;title->setObjectName("title");icon = new QLabel;icon->setObjectName("icon");icon->setProperty("expand", true);QHBoxLayout* layout = new QHBoxLayout(this);layout->addWidget(logo);layout->addWidget(title);layout->addStretch(1);layout->addWidget(icon);layout->setContentsMargins(0,0,0,0);ParseWork::Instance().dynamicUpdateStyleSheet(this,":/qss/src/qss/expandpanel.qss");
}void ExpandPanel::setTitle(const QString &name)
{title->setText(name);
}void ExpandPanel::mousePressEvent(QMouseEvent *event)
{QWidget::mousePressEvent(event);mExpand = !mExpand;emit statuChanged(mExpand);icon->setProperty("expand", mExpand);ParseWork::Instance().dynamicUpdateStyleSheet(this,":/qss/src/qss/expandpanel.qss");
}

2.使用

在mainwindow中创建两部分，左边是折叠面板，右侧是一个qtabwidget(用不到则删掉)

void MainWindow::createFrame()
{mFuncPanel = new QWidget;    mFuncVLayout = new QVBoxLayout;mFuncPanel->setMinimumWidth(220);mFuncPanel->setLayout(mFuncVLayout);mFuncVLayout->setSpacing(15);mFuncVLayout->setContentsMargins(0,0,0,0);mLogPanel = new QTabWidget;mLogPanel->setTabsClosable(true);mLogPanel->setElideMode(Qt::ElideLeft);QSplitter* spliter = new QSplitter;spliter->setOrientation(Qt::Horizontal);spliter->addWidget(mFuncPanel);spliter->addWidget(mLogPanel);spliter->setStretchFactor(1, 1);spliter->setChildrenCollapsible(false);//very importance, not to hide child duruing movingQHBoxLayout* layout = new QHBoxLayout(this);layout->addWidget(spliter);
}void MainWindow::initLocalFilePanel()
{mLocalFilePl = new ExpandPanel;mLocalFilePl->setTitle(tr("LocalFile"));LocalFile* file = new LocalFile;mFuncVLayout->addWidget(mLocalFilePl);mFuncVLayout->addWidget(file);mFuncVLayout->addStretch(1);connect(mLocalFilePl, &ExpandPanel::statuChanged, file, &LocalFile::setVisible);
}