QT：同时滚动2个QPlainTextEdits

Question

我想用2个QPlainTextEdits为我的用法创建一个内部工具。我想创建一个功能，当我滚动一个文本编辑时，另一个也滚动。我试图从http://doc.qt.io/qt-4.8/qt-widgets-codeeditor-example.html找出一些东西，但它不能像我预期的那样工作

这是我的代码：

CustomEdit.h

#ifndef CUSTOMEDIT_H
#define CUSTOMEDIT_H

#include <QPlainTextEdit>

class CustomEdit : public QPlainTextEdit
{
    Q_OBJECT
public:
    CustomEdit(QWidget *parent = 0);

public slots:
    void updatePosition(const QRect &, int);
};

#endif // CUSTOMEDIT_H

CustomEdit.cpp

#include "customedit.h"

CustomEdit::CustomEdit(QWidget *parent) : QPlainTextEdit(parent)
{

}

void CustomEdit::updatePosition(const QRect &rect, int position) {

    if (position) {
        this->scroll(0, position);
        this->update(0, rect.y(), this->width(), rect.height());
    }
    else {
        this->update(0, rect.y(), this->width(), rect.height());
    }

}

MainWindow构造函数

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    printoutAnalyzer = new PrintoutAnalyzer();

    ui->Log->setReadOnly(true);
    ui->Progress->reset();

    resultEdit = new CustomEdit(this);
    printoutEdit = new CustomEdit(this);

    resultEdit->setReadOnly(true);
    printoutEdit->setReadOnly(true);

    ui->horizontalLayout->addWidget(printoutEdit);
    ui->horizontalLayout->addWidget(resultEdit);


    connect(printoutAnalyzer, SIGNAL(writeToLog(QString)), this, SLOT(putLogText(QString)));
    connect(printoutAnalyzer, SIGNAL(writeToResult(QString)), this, SLOT(putResultText(QString)));
    connect(printoutAnalyzer, SIGNAL(setProgress(int)), this, SLOT(setProgress(int)));
    connect(ui->LoadPrintout, SIGNAL(triggered()), this, SLOT(choosePrintoutFile()));

    connect(printoutEdit, SIGNAL(updateRequest(QRect, int)), resultEdit, SLOT(updatePosition(QRect, int)));
    connect(resultEdit, SIGNAL(updateRequest(QRect, int)), printoutEdit, SLOT(updatePosition(QRect, int)));
}

当我执行代码并滚动一个文本编辑时，第二个看起来像这样（文本编辑具有相同的内容）：

Answer 1

最简单的方法是让QPlainTextEdit的垂直滚动条与''sliderPosition属性''保持同步。