//customtabwidget.cpp

#include "customtabwidget.h"
#include <QStackedWidget>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QMouseEvent>
#include <QApplication>
#include <QPainter>
#include <QPixmap>
#include <QMimeData>
#include <QDrag>
#include <QFrame>
#include <QDropEvent>
#include <QDebug>
#include "customtabbar.h"

CustomTabWidget::CustomTabWidget(QWidget *parent)
    : QWidget(parent)
{
    m_pTabBar = new CustomTabBar(this);
    QHBoxLayout *pHLayout = new QHBoxLayout;
    pHLayout->addWidget(m_pTabBar);
    pHLayout->addStretch();
    m_pStackedWidget = new QStackedWidget(this);
    QVBoxLayout *pVLayout = new QVBoxLayout(this);
    pVLayout->addLayout(pHLayout);
    pVLayout->addWidget(m_pStackedWidget);
    pVLayout->setStretch(1, 1);
    pVLayout->setMargin(0);
    pVLayout->setSpacing(0);
    connect(m_pTabBar, SIGNAL(currentChanged(int)), this, SLOT(setCurrentIndex(int)));
    setAcceptDrops(true);
    m_pStackedWidget->setStyleSheet("QStackedWidget{border: 1px solid #000000;}");

    //关闭tab时，信号槽触发的函数
    connect(m_pTabBar, SIGNAL(tabCloseRequested(int)),this,SLOT(slot_tabClose(int)));
}

CustomTabWidget::~CustomTabWidget()
{
}

void CustomTabWidget::addTab(QWidget *widget, const QString &strTab)
{
    int iIndex = m_pTabBar->addTab(strTab);
    m_pStackedWidget->addWidget(widget);
    widget->setAcceptDrops(true);
    //
    m_pTabBar->setCurrentIndex(iIndex);
}

void CustomTabWidget::addTab(QWidget *page, const QIcon &icon, const QString &label)
{
    m_pTabBar->addTab(icon, label);
    m_pStackedWidget->addWidget(page);
}

void CustomTabWidget::addTabs(CustomTabWidget *pOtherTab)
{
    for (int i = 0; i < pOtherTab->count(); i++)
    {
        addTab(pOtherTab->tabWidget(0), pOtherTab->tabText(i));
    }
}

int CustomTabWidget::count() const
{
    return m_pTabBar->count();
}

int CustomTabWidget::currentIndex() const
{
    return m_pTabBar->currentIndex();
}

QWidget * CustomTabWidget::currentWidget() const
{
    return m_pStackedWidget->currentWidget();
}

int CustomTabWidget::insertTab(int index, QWidget *page, const QString &label)
{
    m_pTabBar->insertTab(index, label);
    return m_pStackedWidget->insertWidget(index, page);
}

int CustomTabWidget::insertTab(int index, QWidget *page, const QIcon &icon, const QString &label)
{
    m_pTabBar->insertTab(index, icon, label);
    return m_pStackedWidget->insertWidget(index, page);
}

void CustomTabWidget::removeTab(int index)
{
    m_pTabBar->removeTab(index);
    m_pStackedWidget->removeWidget(m_pStackedWidget->widget(index)); //widget is not deleted but simply removed from the stacked layout, causing it to be hidden.
    if (m_pTabBar->count() == 0)
    {
        emit tabIsEmpty();
        if (m_bAutoDelete)
        {
            hide();
            deleteLater();
        }
    }
}

QString CustomTabWidget::tabText(int index) const
{
    return m_pTabBar->tabText(index);
}

QWidget * CustomTabWidget::tabWidget(int index) const
{
    return m_pStackedWidget->widget(index);
}

void CustomTabWidget::setAutoHideTabBar(bool bHide)
{
    m_bAutoHideBar = bHide;
}

void CustomTabWidget::setCurrentIndex(int index)
{
    m_pStackedWidget->setCurrentIndex(index);
    emit currentTabChanged(m_pTabBar->tabText(index));
}

void CustomTabWidget::setAutoDelete(bool bAuto)
{
    m_bAutoDelete = bAuto;
}

void CustomTabWidget::mousePressEvent(QMouseEvent *event)
{
    QWidget::mousePressEvent(event);
    if (event->button() == Qt::LeftButton)
        m_dragStartPos = event->pos();
}

void CustomTabWidget::mouseMoveEvent(QMouseEvent *event)
{
    QWidget::mouseMoveEvent(event);
}

void CustomTabWidget::paintEvent(QPaintEvent *event)
{
    if (m_bAutoHideBar)
    {
        m_pTabBar->setVisible(m_pTabBar->count() > 1);
    }
}

void CustomTabWidget::dragEnterEvent(QDragEnterEvent *event)
{
    event->acceptProposedAction();
}

void CustomTabWidget::dropEvent(QDropEvent *event)
{
    if (event->mimeData()->hasFormat("application/itemdata"))
    {
        QByteArray itemData = event->mimeData()->data("application/itemdata");
        QDataStream dataStream(&itemData, QIODevice::ReadOnly);
        long long llPtrParent;
        QString strTab;
        long long llPtrChild;
        int nTabIndex;
        dataStream >> llPtrParent >> strTab >> llPtrChild >> nTabIndex;
        CustomTabWidget *tabWidgetFrom = (CustomTabWidget *)llPtrParent;
        QWidget *child = (QWidget *)llPtrChild;
        if (child)
        {
            addTab(child, strTab);
            event->acceptProposedAction();
        }
    }
    else
    {
        event->ignore();
    }
}

//关闭
void CustomTabWidget::slot_tabClose(int index)
{
    removeTab(index);
}