yhkylin-backup-tools/kybackup/component/backuplistwidget.cpp

#include "backuplistwidget.h"
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QPushButton>
#include <QMimeData>
#include <QFileInfo>
#include "mylabel.h"
#include "../messageboxutils.h"

BackupListWidget::BackupListWidget(QWidget *parent /*= nullptr*/) :
    QListWidget(parent)
{
    setSortingEnabled(false);
    setAcceptDrops(true);

    // 列表为空时，展示一个“+”号图标和拖拽文件提示
    m_plusLogo = new MyIconLabel;
    m_plusLogo->setFixedHeight(36);
    m_plusLogo->setThemeIcon("list-add-symbolic", ":/symbos/list-add-symbolic.png");
    // 文件拖放区域
    m_plusLogo->setDesplayText(tr("File drag and drop area"));
    m_plusLogo->setEnabled(false);

    QHBoxLayout *hlayout = new QHBoxLayout;
    hlayout->addStretch();
    hlayout->addWidget(m_plusLogo);
    hlayout->addStretch();

    QVBoxLayout *vlayout = new QVBoxLayout;
    vlayout->addStretch();
    vlayout->addLayout(hlayout);
    vlayout->addStretch();
    setLayout(vlayout);
}

BackupListWidget::~BackupListWidget()
{}

int BackupListWidget::findIndexOfItem(QListWidgetItem *item)
{
    int index = -1;
    for (int row = 0; row < this->count(); ++row) {
        if (item == this->item(row)) {
            index = row;
            break;
        }
    }

    return index;
}

bool BackupListWidget::contains(const QString& text)
{
    // 1、针对使用addItem等的正规使用场景（展示内容在原生item上）
    if (findItems(text, Qt::MatchCaseSensitive).size() > 0)
        return true;

    // 2、针对使用setItemWidget添加项（展示内容在widget上）的特殊使用场景
    return m_List.contains(text);
}

bool BackupListWidget::appendItem(const QString &text)
{
    if (!checkPathLimit(text))
        return false;

    int count = this->count();
    if (count > 0)
        ++count;

    int width = this->width();

    QListWidgetItem *item = new QListWidgetItem(this, m_type);
    item->setSizeHint(QSize(width - 10, 36));
    QWidget *widget = new QWidget;
    QHBoxLayout *hlayout = new QHBoxLayout;

    MyLabel *label = new MyLabel;
    label->setDeplayText(text);
    label->setToolTip(text);
    label->setFixedSize(width - 50, 36);
    label->setAlignment(Qt::AlignTop);
    hlayout->addWidget(label);
    m_List << text;

    QPushButton *buttonDelete = new QPushButton;
    buttonDelete->setProperty("isWindowButton", 0x2);
    buttonDelete->setProperty("useIconHighlightEffect", 0x8);
    buttonDelete->setFlat(true);
    buttonDelete->setFixedSize(20, 20);
    buttonDelete->setIcon(QIcon::fromTheme("window-close-symbolic"));
    hlayout->addWidget(buttonDelete);

    widget->setLayout(hlayout);

    this->setItemWidget(item, widget);
    this->setCurrentItem(item);

    connect(buttonDelete, &QPushButton::clicked, [=]() {
        this->m_List.removeOne(label->text());
        this->takeItem(this->findIndexOfItem(item));
        delete item;
        if (this->count() == 0)
            m_plusLogo->setVisible(true);
    });

    m_plusLogo->setVisible(false);
    return true;
}

void BackupListWidget::dropEvent(QDropEvent *event)
{
    if (event->mimeData()->hasUrls()) {
        for (QUrl url : event->mimeData()->urls()) {
            QString file = url.toString();
            if (file.startsWith("file://")) {
                file.replace("file://", "");
                appendItem(file);
            }
        }
    }
}

bool BackupListWidget::checkPathLimit(const QString &path)
{
    // 1、列表中是否已经存在
    if (contains(path)) {
        MessageBoxUtils::QMESSAGE_BOX_WARNING(this, QObject::tr("Warning"),
                                              QObject::tr("Path already exists : ") + path,
                                              QObject::tr("Ok"));
        return false;
    }

    // 2、路径是否存在
    QFileInfo fileInfo(path);
    if (!fileInfo.exists()) {
        MessageBoxUtils::QMESSAGE_BOX_WARNING(this, QObject::tr("Warning"),
                                              QObject::tr("The file or directory does not exist : ") + path,
                                              QObject::tr("Ok"));
        return false;
    }

    // 3、是否是限定路径及其子路径
    bool blimit = false;
    QString dirCanBeSelected;
    for (const QString &item : m_pathLimit) {
        if (path.startsWith(item)) {
            blimit = true;
            break;
        }

        if (dirCanBeSelected.isEmpty())
            dirCanBeSelected = item;
        else {
            dirCanBeSelected += ",";
            dirCanBeSelected += item;
        }
    }
    if (m_pathLimit.size() > 0 && !blimit) {
        MessageBoxUtils::QMESSAGE_BOX_WARNING(this, QObject::tr("Warning"),
                                              QObject::tr("Only data that exists in the follow directorys can be selected: ") + dirCanBeSelected,
                                              QObject::tr("Ok"));
        return false;
    }

    return true;
}