我正在使用 qsortfilterproxymodel 来过滤来自 QstandardModel 的数据。我能够在我的测试应用程序中实现此过滤过程，但是当我实时使用它时[集成]，它似乎没有按预期工作。
[问题]:在我的情况下，数据将每 33 毫秒(大约)写入 QstandardModel[sourcemodel] ，这意味着每 1 秒连续 33-36 行，但是当我使用 qsortfilterproxymodel 进行过滤时它没有按照过滤器检查(指定)显示数据，并且我还重写了 qsortfilterproxymodel 的 filterAcceptrows() 方法，只是为了在使用 QMutex 过滤和释放源模型之前锁定源模型。但我无法实现实时过滤。
[问题:]在 filterAcceptRows() 方法中添加新行时，如何仅过滤添加到源模型的新行而不是整个模型？
请帮忙..谢谢
ProxyTest.cpp
#include "proxymodeltest.h"
#include "ui_proxymodeltest.h"
QMutex mutex;
ProxyModelTest::ProxyModelTest(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::ProxyModelTest)
{
ui->setupUi(this);
secondtext = "SECOND";
firstText = "FIRST";
regExp = "\\b(" + firstText + "|" + secondtext + ")\\b";
model = new QStandardItemModel();
proxyModel = new MySortFilterProxyModel();
proxyModel->setFilterRegExp(regExp);
ui->tableView->setModel(proxyModel);
proxyModel->setSourceModel(model);
timer = new QTimer(this);
connect(timer,SIGNAL(timeout()),this,SLOT(updateTable()));
connect(proxyModel,SIGNAL(rowsInserted(QModelIndex,int,int)),this,
SLOT(checkInserted(QModelIndex,int,int)));
timer->start(25);
}
ProxyModelTest::~ProxyModelTest()
{
delete ui;
}
void ProxyModelTest::updateTable()
{
static int count = 0;
model->insertRow(0,new QStandardItem(""));
for(int col = 0; col < 4 ;col++)
{
model->setItem(0,col,new QStandardItem(""));
if( count % 2 == 0)
model->item(0,col)->setBackground(QBrush(QColor("yellow")));
else
model->item(0,col)->setBackground(QBrush(QColor("lightGreen")));
}
if( count % 2 == 0)
{
model->item(0,0)->setText("FIRST");
model->item(0,1)->setText("some text");
model->item(0,2)->setText("some text");
model->item(0,3)->setText("some text");
}
else
{
model->item(0,0)->setText("SECOND");
model->item(0,1)->setText("some text");
model->item(0,2)->setText("some text");
model->item(0,3)->setText("some text");
}
count++;
}
void ProxyModelTest::on_firstCheck_toggled(bool checked)
{
if(checked)
{
firstText = "FIRST";
}
else
{
firstText = "---";
}
regExp = "\\b(" + firstText + "|" + secondtext + ")\\b";
qDebug() << regExp;
proxyModel->setFilterRegExp(regExp);
}
void ProxyModelTest::on_checkSecond_toggled(bool checked)
{
if(checked)
{
secondtext = "SECOND";
}
else
{
secondtext = "---";
}
regExp = "\\b(" + firstText + "|" + secondtext + ")\\b";
proxyModel->setFilterRegExp(regExp);
}
void ProxyModelTest::checkInserted(QModelIndex index, int a, int b)
{
qDebug() <<"in checkInserted";
}
MySortFilterProxyModel::MySortFilterProxyModel(QObject *parent)
: QSortFilterProxyModel(parent)
{
}
bool MySortFilterProxyModel::filterAcceptsRow(int sourceRow,
const QModelIndex &sourceParent) const
{
bool status;
mutex.lock();
QModelIndex index0 = sourceModel()->index(sourceRow, 0, sourceParent);
//QModelIndex index1 = sourceModel()->index(sourceRow, 1, sourceParent);
//QModelIndex index2 = sourceModel()->index(sourceRow, 2, sourceParent);
qDebug() <<"in filter Accept rows";
status = sourceModel()->data(index0).toString().contains(filterRegExp());
mutex.unlock();
return status;
}
void ProxyModelTest::on_pushButton_clicked()
{
timer->stop();
}
ProxyTest.h
#ifndef PROXYMODELTEST_H
#define PROXYMODELTEST_H
#include <QMainWindow>
#include <QStandardItemModel>
#include <QSortFilterProxyModel>
#include <QTimer>
#include <QDebug>
#include <QMutex>
namespace Ui {
class ProxyModelTest;
}
class MySortFilterProxyModel : public QSortFilterProxyModel
{
Q_OBJECT
public:
MySortFilterProxyModel(QObject *parent = 0);
protected:
bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const Q_DECL_OVERRIDE;
private:
bool dateInRange(const QDate &date) const;
};
class ProxyModelTest : public QMainWindow
{
Q_OBJECT
public:
explicit ProxyModelTest(QWidget *parent = 0);
~ProxyModelTest();
private slots:
void updateTable();
void on_firstCheck_toggled(bool checked);
void on_checkSecond_toggled(bool checked);
void checkInserted(QModelIndex index,int a,int b);
void on_pushButton_clicked();
private:
Ui::ProxyModelTest *ui;
QStandardItemModel *model;
MySortFilterProxyModel *proxyModel;
QString firstText,secondtext,regExp;
QTimer *timer;
};
#endif // PROXYMODELTEST_H
[更新2]
proxyModelTest.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>ProxyModelTest</class>
<widget class="QMainWindow" name="ProxyModelTest">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>639</width>
<height>399</height>
</rect>
</property>
<property name="windowTitle">
<string>ProxyModelTest</string>
</property>
<widget class="QWidget" name="centralWidget">
<widget class="QTableView" name="tableView">
<property name="geometry">
<rect>
<x>10</x>
<y>30</y>
<width>481</width>
<height>301</height>
</rect>
</property>
</widget>
<widget class="QPushButton" name="pushButton">
<property name="geometry">
<rect>
<x>550</x>
<y>200</y>
<width>75</width>
<height>23</height>
</rect>
</property>
<property name="text">
<string>PushButton</string>
</property>
</widget>
<widget class="QWidget" name="layoutWidget">
<property name="geometry">
<rect>
<x>510</x>
<y>60</y>
<width>111</width>
<height>81</height>
</rect>
</property>
<layout class="QVBoxLayout" name="verticalLayout">
<item>
<widget class="QCheckBox" name="firstCheck">
<property name="text">
<string>First</string>
</property>
</widget>
</item>
<item>
<widget class="QCheckBox" name="checkSecond">
<property name="text">
<string>second</string>
</property>
</widget>
</item>
</layout>
</widget>
</widget>
<widget class="QMenuBar" name="menuBar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>639</width>
<height>21</height>
</rect>
</property>
</widget>
<widget class="QToolBar" name="mainToolBar">
<attribute name="toolBarArea">
<enum>TopToolBarArea</enum>
</attribute>
<attribute name="toolBarBreak">
<bool>false</bool>
</attribute>
</widget>
<widget class="QStatusBar" name="statusBar"/>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections/>
</ui>
最佳答案
我无法编译您的代码(缺少ui_proxymodeltest.h)，但我创建了一个可重现的示例，您可能会发现对此有用。
我的过滤代理故意很简单 - 它只传递所有五的倍数的项目:
#include <QSortFilterProxyModel>
class OneInFiveProxyModel : public QSortFilterProxyModel
{
Q_OBJECT
public:
OneInFiveProxyModel(QObject *parent = nullptr);
protected:
bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const Q_DECL_OVERRIDE;
};
OneInFiveProxyModel::OneInFiveProxyModel(QObject *parent)
: QSortFilterProxyModel(parent)
{
}
bool OneInFiveProxyModel::filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const
{
return sourceModel()->index(sourceRow, 0, sourceParent).data(Qt::UserRole).toInt() % 5 == 0;
}
这是一个简单的类，它将发出我们想要放入模型中的数据:
class Ticker : public QObject
{
Q_OBJECT
const int count;
public:
Ticker(int count, QObject *parent = 0);
public slots:
void run();
signals:
void tick(int);
void finished();
};
#include <QThread>
Ticker::Ticker(int count, QObject *parent)
: QObject(parent),
count(count)
{
}
void Ticker::run() {
for (int i = 0; i < count; ++i) {
QThread::msleep(25);
emit tick(i);
}
emit finished();
}
现在，让我们将它们放入应用程序中。我们将在线程内运行一次股票代码，然后在其自己的线程中再次运行:
#include <QCoreApplication>
#include <QDebug>
#include <QStandardItemModel>
int main(int argc, char **argv)
{
QCoreApplication app(argc, argv);
QStandardItemModel model;
OneInFiveProxyModel proxy;
proxy.setSourceModel(&model);
Ticker t(25);
QObject::connect(&t, &Ticker::tick, &model, [&model](int i){
auto item = new QStandardItem{QString::number(i)};
item->setData(i, Qt::UserRole);
model.appendRow(item);
});
// run it in this thread
t.run();
qDebug() << "After first run, model contains" << model.rowCount() << "items"
<< "and proxy contains" << proxy.rowCount() << "items";
// run it again, but in a different thread
QThread thread;
t.moveToThread(&thread);
QObject::connect(&thread, &QThread::started, &t, &Ticker::run);
QObject::connect(&t, &Ticker::finished, &thread, &QThread::quit);
QObject::connect(&thread, &QThread::finished, &app, &QCoreApplication::quit);
thread.start();
app.exec(); // will return when the thread finishes
qDebug() << "After second run, model contains" << model.rowCount() << "items"
<< "and proxy contains" << proxy.rowCount() << "items";
}
运行此命令，我每次都会在模型中获得 25 个项目，其中 5 个通过代理可见:
After first run, model contains 25 items and proxy contains 5 items
After second run, model contains 50 items and proxy contains 10 items
需要注意的几点，可能会对您有所帮助:
- 模型和代理位于同一线程中。这是至关重要的，这样代理就可以访问源模型而无需锁定
- 我们使用信号来发送要添加到源模型的数据。因此，这些数据的发起者不需要与模型位于同一线程中。
- 当我向
filterAcceptsRow添加调试行时，我可以确认每个添加的项目仅调用一次该调试行。
关于c++ - QSortFilterProxyModel 过滤实时数据的问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37235743/