I. Preface

Disk capacity statistics control, to put it bluntly, is used to count the capacity occupied by local disk characters, including but not limited to used space, remaining space, total size, percentage used, etc. The corresponding percentage is displayed by progress bar, the foreground color, background color and text color of the progress bar can be set, and the overall skin can be changed. You need it when you need it. This control is compatible with WIN and LINUX operating system. winapi is used to read on WIN. QProcess is used to execute the corresponding command (df-h) to get the results. Then the timer is executed. The correlation signal slot is used to get the returned amount of data to parse. The application scenarios of the control are mainly in some cases. On the embedded device, it is convenient for users to see how much space is left at present.

II. Functions of Realization

• 1: Total/Used Capacity of Local Storage Devices Can be Loaded Automatically
• 2: Progress Bar Displays Used Capacity
• 3: Support all operating systems
• 4: Increase the arrival signal of U disk or SD card

III. EFFECT CHARACTERISTICS

Header file code

#ifndef DEVICESIZETABLE_H
#define DEVICESIZETABLE_H

/**
 * Author of Local Storage Space Size Control: feiyangqingyun(QQ:517216493) 2016-11-30
 * 1:Total/Used Capacity of Local Storage Devices with Automatic Loading
 * 2:Progress Bar Displays Used Capacity
 * 3:Support all operating systems
 * 4:Increase the arrival signal of U disk or SD card
 */

#include <QTableWidget>

class QProcess;

#ifdef quc
#if (QT_VERSION < QT_VERSION_CHECK(5,7,0))
#include <QtDesigner/QDesignerExportWidget>
#else
#include <QtUiPlugin/QDesignerExportWidget>
#endif

class QDESIGNER_WIDGET_EXPORT DeviceSizeTable : public QTableWidget
#else
class DeviceSizeTable : public QTableWidget
#endif

{
    Q_OBJECT
    Q_PROPERTY(QColor bgColor READ getBgColor WRITE setBgColor)
    Q_PROPERTY(QColor chunkColor1 READ getChunkColor1 WRITE setChunkColor1)
    Q_PROPERTY(QColor chunkColor2 READ getChunkColor2 WRITE setChunkColor2)
    Q_PROPERTY(QColor chunkColor3 READ getChunkColor3 WRITE setChunkColor3)
    Q_PROPERTY(QColor textColor1 READ getTextColor1 WRITE setTextColor1)
    Q_PROPERTY(QColor textColor2 READ getTextColor2 WRITE setTextColor2)
    Q_PROPERTY(QColor textColor3 READ getTextColor3 WRITE setTextColor3)

public:
    explicit DeviceSizeTable(QWidget *parent = 0);

private:
    QProcess *process;          //Execution command process

    QColor bgColor;             //background color
    QColor chunkColor1;         //Progress color 1
    QColor chunkColor2;         //Progress color 2
    QColor chunkColor3;         //Progress color 3
    QColor textColor1;          //Text color 1
    QColor textColor2;          //Text color 2
    QColor textColor3;          //Text color 3

private slots:
    void readData();
    void checkSize(const QString &result, const QString &name);
    void insertSize(const QString &name, const QString &use, const QString &free, const QString &all, int percent);

public:
    QColor getBgColor()         const;
    QColor getChunkColor1()     const;
    QColor getChunkColor2()     const;
    QColor getChunkColor3()     const;
    QColor getTextColor1()      const;
    QColor getTextColor2()      const;
    QColor getTextColor3()      const;

    QSize sizeHint()            const;
    QSize minimumSizeHint()     const;

public Q_SLOTS:
    //Load capacity
    void load();

    //Set the background color
    void setBgColor(const QColor &bgColor);

    //Setting progress color
    void setChunkColor1(const QColor &chunkColor1);
    void setChunkColor2(const QColor &chunkColor2);
    void setChunkColor3(const QColor &chunkColor3);

    //Setting text color
    void setTextColor1(const QColor &textColor1);
    void setTextColor2(const QColor &textColor2);
    void setTextColor3(const QColor &textColor3);

Q_SIGNALS:
    void sdcardReceive(const QString &sdcardName);
    void udiskReceive(const QString &udiskName);
};

#endif // DEVICESIZETABLE_H

V. Core Code

#pragma execution_character_set("utf-8")

#include "devicesizetable.h"
#include "qprocess.h"
#include "qtablewidget.h"
#include "qheaderview.h"
#include "qfileinfo.h"
#include "qdir.h"
#include "qprogressbar.h"
#include "qtimer.h"
#include "qdebug.h"

#ifdef Q_OS_WIN
#include "windows.h"
#endif
#define GB (1024 * 1024 * 1024)
#define MB (1024 * 1024)
#define KB (1024)

DeviceSizeTable::DeviceSizeTable(QWidget *parent) : QTableWidget(parent)
{
    bgColor = QColor(255, 255, 255);

    chunkColor1 = QColor(100, 184, 255);
    chunkColor2 = QColor(24, 189, 155);
    chunkColor3 = QColor(255, 107, 107);

    textColor1 = QColor(10, 10, 10);
    textColor2 = QColor(255, 255, 255);
    textColor3 = QColor(255, 255, 255);

    process = new QProcess(this);
    connect(process, SIGNAL(readyRead()), this, SLOT(readData()));

    this->clear();

    //Set column number and column width
    this->setColumnCount(5);
    this->setColumnWidth(0, 100);
    this->setColumnWidth(1, 120);
    this->setColumnWidth(2, 120);
    this->setColumnWidth(3, 120);
    this->setColumnWidth(4, 120);

    this->setStyleSheet("QTableWidget::item{padding:0px;}");

    QStringList headText;
    headText << "Disc character" << "used space" << "Available space" << "Total size" << "Percentage used" ;

    this->setHorizontalHeaderLabels(headText);
    this->setSelectionBehavior(QAbstractItemView::SelectRows);
    this->setEditTriggers(QAbstractItemView::NoEditTriggers);
    this->setSelectionMode(QAbstractItemView::SingleSelection);
    this->verticalHeader()->setVisible(true);
    this->horizontalHeader()->setStretchLastSection(true);

    QTimer::singleShot(0, this, SLOT(load()));
}

QColor DeviceSizeTable::getBgColor() const
{
    return this->bgColor;
}

QColor DeviceSizeTable::getChunkColor1() const
{
    return this->chunkColor1;
}

QColor DeviceSizeTable::getChunkColor2() const
{
    return this->chunkColor2;
}

QColor DeviceSizeTable::getChunkColor3() const
{
    return this->chunkColor3;
}

QColor DeviceSizeTable::getTextColor1() const
{
    return this->textColor1;
}

QColor DeviceSizeTable::getTextColor2() const
{
    return this->textColor2;
}

QColor DeviceSizeTable::getTextColor3() const
{
    return this->textColor3;
}

void DeviceSizeTable::load()
{
    //Clean up the original data
    int row = this->rowCount();

    for (int i = 0; i < row; i++) {
        this->removeRow(0);
    }

#ifdef Q_OS_WIN
    QFileInfoList list = QDir::drives();

    foreach (QFileInfo dir, list) {
        QString dirName = dir.absolutePath();
        LPCWSTR lpcwstrDriver = (LPCWSTR)dirName.utf16();
        ULARGE_INTEGER liFreeBytesAvailable, liTotalBytes, liTotalFreeBytes;

        if (GetDiskFreeSpaceEx(lpcwstrDriver, &liFreeBytesAvailable, &liTotalBytes, &liTotalFreeBytes)) {
            QString use = QString::number((double)(liTotalBytes.QuadPart - liTotalFreeBytes.QuadPart) / GB, 'f', 1);
            use += "G";
            QString free = QString::number((double) liTotalFreeBytes.QuadPart / GB, 'f', 1);
            free += "G";
            QString all = QString::number((double) liTotalBytes.QuadPart / GB, 'f', 1);
            all += "G";
            int percent = 100 - ((double)liTotalFreeBytes.QuadPart / liTotalBytes.QuadPart) * 100;

            insertSize(dirName, use, free, all, percent);
        }
    }

#else
    process->start("df -h");
#endif
}

void DeviceSizeTable::setBgColor(const QColor &bgColor)
{
    if (this->bgColor != bgColor) {
        this->bgColor = bgColor;
        this->load();
    }
}

void DeviceSizeTable::setChunkColor1(const QColor &chunkColor1)
{
    if (this->chunkColor1 != chunkColor1) {
        this->chunkColor1 = chunkColor1;
        this->load();
    }
}

void DeviceSizeTable::setChunkColor2(const QColor &chunkColor2)
{
    if (this->chunkColor2 != chunkColor2) {
        this->chunkColor2 = chunkColor2;
        this->load();
    }
}

void DeviceSizeTable::setChunkColor3(const QColor &chunkColor3)
{
    if (this->chunkColor3 != chunkColor3) {
        this->chunkColor3 = chunkColor3;
        this->load();
    }
}

void DeviceSizeTable::setTextColor1(const QColor &textColor1)
{
    if (this->textColor1 != textColor1) {
        this->textColor1 = textColor1;
        this->load();
    }
}

void DeviceSizeTable::setTextColor2(const QColor &textColor2)
{
    if (this->textColor2 != textColor2) {
        this->textColor2 = textColor2;
        this->load();
    }
}

void DeviceSizeTable::setTextColor3(const QColor &textColor3)
{
    if (this->textColor3 != textColor3) {
        this->textColor3 = textColor3;
        this->load();
    }
}

void DeviceSizeTable::readData()
{
    while (!process->atEnd()) {
        QString result = QLatin1String(process->readLine());
#ifdef __arm__
        if (result.startsWith("/dev/root")) {
            checkSize(result, "Local Storage");
        } else if (result.startsWith("/dev/mmcblk")) {
            checkSize(result, "Local Storage");
        } else if (result.startsWith("/dev/mmcblk1p")) {
            checkSize(result, "SD card");
            QStringList list = result.split(" ");
            emit sdcardReceive(list.at(0));
        } else if (result.startsWith("/dev/sd")) {
            checkSize(result, "U disc");
            QStringList list = result.split(" ");
            emit udiskReceive(list.at(0));
        }
#else
        if (result.startsWith("/dev/sd")) {
            checkSize(result, "");
            QStringList list = result.split(" ");
            emit udiskReceive(list.at(0));
        }
#endif
    }
}

void DeviceSizeTable::checkSize(const QString &result, const QString &name)
{
    QString dev, use, free, all;
    int percent = 0;
    QStringList list = result.split(" ");
    int index = 0;

    for (int i = 0; i < list.count(); i++) {
        QString s = list.at(i).trimmed();

        if (s == "") {
            continue;
        }

        index++;

        if (index == 1) {
            dev = s;
        } else if (index == 2) {
            all = s;
        } else if (index == 3) {
            use = s;
        } else if (index == 4) {
            free = s;
        } else if (index == 5) {
            percent = s.left(s.length() - 1).toInt();
            break;
        }
    }

    if (name.length() > 0) {
        dev = name;
    }

    insertSize(dev, use, free, all, percent);
}

void DeviceSizeTable::insertSize(const QString &name, const QString &use, const QString &free, const QString &all, int percent)
{
    int row = this->rowCount();
    this->insertRow(row);

    QTableWidgetItem *itemname = new QTableWidgetItem(name);
    QTableWidgetItem *itemuse = new QTableWidgetItem(use);
    itemuse->setTextAlignment(Qt::AlignCenter);
    QTableWidgetItem *itemfree = new QTableWidgetItem(free);
    itemfree->setTextAlignment(Qt::AlignCenter);
    QTableWidgetItem *itemall = new QTableWidgetItem(all);
    itemall->setTextAlignment(Qt::AlignCenter);

    this->setItem(row, 0, itemname);
    this->setItem(row, 1, itemuse);
    this->setItem(row, 2, itemfree);
    this->setItem(row, 3, itemall);

    QProgressBar *bar = new QProgressBar;
    bar->setRange(0, 100);
    bar->setValue(percent);

    QString qss = QString("QProgressBar{background:%1;border-width:0px;border-radius:0px;text-align:center;}"
                          "QProgressBar::chunk{border-radius:0px;}").arg(bgColor.name());

    if (percent < 50) {
        qss += QString("QProgressBar{color:%1;}QProgressBar::chunk{background:%2;}").arg(textColor1.name()).arg(chunkColor1.name());
    } else if (percent < 90) {
        qss += QString("QProgressBar{color:%1;}QProgressBar::chunk{background:%2;}").arg(textColor2.name()).arg(chunkColor2.name());
    } else {
        qss += QString("QProgressBar{color:%1;}QProgressBar::chunk{background:%2;}").arg(textColor3.name()).arg(chunkColor3.name());
    }

    bar->setStyleSheet(qss);
    this->setCellWidget(row, 4, bar);
}

QSize DeviceSizeTable::sizeHint() const
{
    return QSize(500, 300);
}

QSize DeviceSizeTable::minimumSizeHint() const
{
    return QSize(200, 150);
}

Introduction of Control

1. More than 149 exquisite controls, covering a variety of dashboards, progress bars, progress balls, compasses, curves, rulers, thermometers, navigation bars, navigation bars, flatui, highlighted buttons, sliding selectors, the lunar calendar and so on. Far more controls than qwt integrates.
2. Each class can be separated into a separate control, zero-coupling, each control has a header file and an implementation file, independent of other files, to facilitate the integration of a single control in the form of source code into the project, less code. The control classes of qwt are interlinked and highly coupled. If you want to use one of the controls, you must include all the code.
3. All pure Qt writing, QWidget+QPainter drawing, support any Qt version from Qt4.6 to Qt5.12, support mingw, msvc, gcc and other compilers, support any operating system such as windows+linux+mac + embedded linux, no scrambling, can be directly integrated into Qt Creator, as with its own controls, most of the effects as long as set up. Several attributes can be used, which is very convenient.
4. Each control has a corresponding separate DEMO containing the source code of the control, which is convenient for reference. It also provides an integrated DEMO for all controls.
5. The source code of each control has detailed Chinese annotations, which are compiled in accordance with the unified design specifications. It is convenient to learn how to compile custom controls.
6. Each control's default color matching and demo's corresponding color matching are very beautiful.
7. More than 130 visible controls and 6 invisible controls.
8. Some controls provide a variety of style choices, a variety of indicator style choices.
9. All controls adapt to form stretching changes.
10. Integrate custom control property designer, support drag design, WYSIWYG, support import and export xml format.
11. With activex control demo, all controls can run directly in ie browser.
12. Integrate fontawesome graphic fonts + hundreds of graphic fonts collected by Alibaba iconfont to enjoy the fun of graphic fonts.
13. All controls finally generate a dll Dynamic Library file, which can be directly integrated into the qtcreator for dragging design use.
14. At present, there is a version of qml, pyqt version will be considered later, if the user demand is large.

7. SDK Download

• SDK Download Link: https://pan.baidu.com/s/1A5Gd77kExm8Co5ckT51vvQ Extraction code: 877p
• The download link contains various versions of dynamic library files, header files of all controls, using demo, custom control + property designer.
• Custom control plug-in open dynamic library dll use (permanent free), without any back door and restrictions, please feel free to use.
• At present, 26 versions of dll have been provided, including qt5.12.3 MSVC 2017 32 + 64 MinGW 32 + 64.
• Increase control and improve control from time to time, update SDK from time to time. Welcome to make suggestions. Thank you!
• widget version (QQ: 517216493) qml version (QQ: 373955953) camel (QQ: 278969898).
• The Way to Advance Qt in Taoge's Knowledge Column https://zhuanlan.zhihu.com/TaoQt
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