MDIchild - QAbstractScrollArea中的QWidget问题

Question

在我的开源项目中，我想添加一个扇区扫描功能。为此，我尝试创建一个类似于碎片整理软件产品的Widget。除了我不能使控件可滚动的问题之外，一切都在工作。我的代码总是会生成一个强制的大小，这样mdichild (父对象)就会调整大小，滚动就会在MdiArea中，而不是在窗口中。意味着它将把mdiHeader滚动出视图。

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我希望控件本身变成滚动条来滚动，而mdichild窗口将保持它的大小。我的代码是：

MDICHild: mdichild_scan.cpp

#include <QtWidgets>
#include "mdichild_scan.h"
#include "FoxSDKBurningLib.h"
#include "mainwindow.h"
#include "settingspages.h"
#include "messanger.h"

MdiChildScan::MdiChildScan(QWidget* parent, const QString &device)
    :strBurnDrive(device){
    setAttribute(Qt::WA_DeleteOnClose);
    mProjectType = RuleManager::TYPE_PROJECT_DEVICEINFO;
    thisSuccessfullCreated = true;

    QString wTitle = tr("Hex ");
    wTitle += " (";
    wTitle += strBurnDrive;
    wTitle += ")";

    setWindowTitle(wTitle);

    QVBoxLayout * dlgSplitter = new QVBoxLayout(this);
    QHBoxLayout * topNav = new QHBoxLayout(this);
    QWidget * wdgSplitter = new QWidget(this);

    QLabel *labelTopNav = new QLabel(this);
    labelTopNav->setText(tr("This is a header"));
    topNav->addWidget(labelTopNav);
    topNav->setContentsMargins(1,8,1,0);

    dlgSplitter->setContentsMargins(0,0,0,0);
    dlgSplitter->setSpacing(0);
    dlgSplitter->setMargin(0);

    dlgSplitter->addLayout(topNav);

    scanBoard = new QScanBoard(45, 65);
    dlgSplitter->addWidget(scanBoard);



    wdgSplitter->setLayout(dlgSplitter);


    this->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
    this->setCentralWidget(wdgSplitter);


}

mdichild_scan.h

#ifndef MDICHILD_SCAN_H
#define MDICHILD_SCAN_H

#include <QMainWindow>
#include <QtWidgets>
#include <QListView>
#include <QSplitter>
#include <QLabel>
#include "mdichild_base.h"
#include "FoxSDKBurningLib.h"
#include "vrulemanager.h"
#include "QScanBoard.h"

class MdiChildScan : public MdiChildBase
{
    Q_OBJECT

public:
    MdiChildScan(QWidget* parent, const QString &device);
    RuleManager::ProjectType GetProjectType() {return mProjectType;}
    bool thisSuccessfullCreated;

protected:
    RuleManager::ProjectType mProjectType;

    QString strBurnDrive;

private:
    QScanBoard* scanBoard;

};

#endif

控件本身: QScanBoard.cpp

#include "QScanBoard.h"

#include <QGridLayout>
#include <QScrollBar>
#include <QSet>

QScanBoard::QScanBoard(unsigned int numRows, unsigned int numCols, QWidget* parent)
    : QAbstractScrollArea(parent)
    , m_numRows(numRows)
    , m_numCols(numCols)
{
    setupLayout();
    createTiles();

}

void QScanBoard::setupLayout()
{
    this->setAttribute(Qt::WA_LayoutUsesWidgetRect);
    this->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
    auto layout = new QGridLayout;

    layout->setSpacing(0);
    layout->setMargin(0);
    layout->setContentsMargins(0, 0, 0, 0);
    layout->setSizeConstraint(QLayout::SetFixedSize);

    setLayout(layout);

    setFocusPolicy(Qt::StrongFocus);

    verticalScrollBar()->setValue(0);
}

void QScanBoard::createTiles()
{
    for (unsigned int r = 0; r < m_numRows; ++r)
    {
        m_tiles += QList<QScanTile*>{};
        for (unsigned int c = 0; c < m_numCols; ++c)
        {
            // add a new tile to the row
            m_tiles[r] += new QScanTile({ r, c }, this);
            static_cast<QGridLayout*>(this->layout())->addWidget(m_tiles[r][c], r, c);

        }
    }
    m_tiles[0][0]->setDown(true);

    viewport() -> update();
}

QScanBoard.h

#ifndef QSCANBOARD_H
#define QSCANBOARD_H

#pragma once
#include <QList>
#include <QFrame>
#include <QSet>
#include <QAbstractScrollArea>

#include "QScanTile.h"

class QScanBoard : public QAbstractScrollArea
{
    Q_OBJECT

public:

    QScanBoard(unsigned int numRows, unsigned int numCols, QWidget* parent = nullptr);

    unsigned int numCols() const { return m_numCols; }
    unsigned int numRows() const { return m_numRows; }


signals:

    void initialized();

private:

    void createTiles();
    void setupLayout();

private:

    unsigned int m_numRows;
    unsigned int m_numCols;

    QList<QList<QScanTile*>> m_tiles;

    QSet<QScanTile*> m_sectors;

};

#endif // QSCANBOARD_H

进度项: QScanTile.cpp

#include "QScanTile.h"

#include <thread>
#include <chrono>

#include <QDebug>
#include <QState>
#include <QFinalState>
#include <QMouseEvent>
#include <QSizePolicy>

const QString QScanTile::unrevealedStyleSheet =
"QScanTile"
"{"
"   border: 1px solid darkgray;"
"   background: qradialgradient(cx : 0.4, cy : -0.1, fx : 0.4, fy : -0.1, radius : 1.35, stop : 0 #fff, stop: 1 #bbb);"
"   border - radius: 1px;"
"}";
const QString QScanTile::revealedStyleSheet =
"QScanTile"
"{"
"   border: 1px solid lightgray;"
"}";
const QString QScanTile::revealedWithNumberStylesheet =
"QScanTile"
"{"
"   color: %1;"
"   font-weight: bold;"
"   border: 1px solid lightgray;"
"}";

QIcon QScanTile::blankIcon()
{
    static QIcon icon = QIcon();
    return icon;
}

QScanTile::QScanTile(QScanTileLocation location, QWidget* parent /*= nullptr*/)
    : m_adjacentFlaggedCount(0)
    , m_location(location)
    , QPushButton(parent)
{
    this->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
    setCheckable(true);

    this->setIcon(blankIcon());
    this->setStyleSheet(unrevealedStyleSheet);
}

QScanTile::~QScanTile()
{

}



QScanTileLocation QScanTile::location() const
{
    return m_location;
}


QSize QScanTile::sizeHint() const
{
    return QSize(12, 12);
}

QScanTile.h

#ifndef QSCANTILE_H
#define QSCANTILE_H

#pragma once
#include <QPushButton>
#include <QList>
#include <QStateMachine>
#include <QState>
#include <QFinalState>
#include <QSignalMapper>

struct QScanTileLocation
{
    unsigned int row;
    unsigned int column;
};

class QScanTile : public QPushButton
{
    Q_OBJECT
public:

    QScanTile(QScanTileLocation location, QWidget* parent = nullptr);
    virtual ~QScanTile() override;

    QScanTileLocation location() const;

    virtual QSize sizeHint() const override;

    static QIcon blankIcon();

private:
    QScanTileLocation m_location;

    static const QString unrevealedStyleSheet;
    static const QString revealedStyleSheet;
    static const QString revealedWithNumberStylesheet;

};

#endif // QSCANTILE_H

我希望有人能帮助我为什么控件不会得到预期的滚动条。(见红色)

​

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Answer 1

我自己解决了。QAbstractArea是错误的方式。现在，它完美地工作了。

向MDI子级添加了一个ScrollArea，并将控件放在此

   scanBoard = new QScanBoard(200, 83);

    scrollArea->setWidget(scanBoard);

控件从QAbstractScrollArea更改为QFrame。