Tosainu/QWebView_exchange-value.pro

## jsobj.cc
#include "jsobj.h"

JsObj::JsObj(QObject *parent) : QObject(parent) {}

void JsObj::setTextArea(QString s) {
  emit textAreaChanged(s);
}

void JsObj::setQTextEdit(QString s) {
  emit qTextEditChanged(s);
}

## jsobj.h
#ifndef JSOBJ_H
#define JSOBJ_H

#include <QtCore>
#include <QString>

class JsObj : public QObject {
  Q_OBJECT

public:
  JsObj(QObject *parent = nullptr);

signals:
  void textAreaChanged(QString);
  void qTextEditChanged(QString);

public slots:
  void setTextArea(QString s);
  void setQTextEdit(QString s);
};

#endif

## main.cc
#include <QApplication>
#include "mainwindow.h"

auto main(int argc, char **argv) -> int {
  QApplication app(argc, argv);

  MainWindow window;
  window.show();

  return app.exec();
}

## mainwindow.cc
#include "mainwindow.h"
#include "jsobj.h"

MainWindow::MainWindow() {
  textedit = new QTextEdit();

  auto jo = new JsObj();
  connect(this, SIGNAL(textChanged(QString)), jo, SLOT(setTextArea(QString)));
  connect(jo, SIGNAL(qTextEditChanged(QString)), textedit, SLOT(setPlainText(QString)));

  auto button   = new QPushButton("Send to QWebView");
  connect(button, SIGNAL(clicked()), this, SLOT(onClick()));

  auto webview = new QWebView(this);
  webview->setMaximumWidth(400);
  webview->setMaximumHeight(400);
  webview->page()->mainFrame()->addToJavaScriptWindowObject("jsobj", jo);
  webview->setHtml(R"(
    <!DOCTYPE html>
    <html lang="en">
      <head>
        <meta charset="UTF-8">
        <style>
          html {
            font: 16px/1.6 Roboto, 'Droid Sans', 'Hiragino Kaku Gothic ProN', sans-serif;
          }
          textarea {
            height: 200px;
            width: 100%;
          }
        </style>
        <script>
          jsobj.textAreaChanged.connect(function(s) {
            document.getElementById("test").value = s;
          });

          var onClick = function() {
            jsobj.setQTextEdit(document.getElementById("test").value);
          };
        </script>
      </head>
      <body>
        <p>QWebView</p>
        <textarea id="test"></textarea>
        <button onClick="onClick();">Send to QTextEdit</button>
      </body>
    </html>
  )");

  auto right = new QVBoxLayout();
  right->addWidget(new QLabel("QWidget"));
  right->addWidget(textedit);
  right->addWidget(button);

  auto layout = new QHBoxLayout();
  layout->addWidget(webview);
  layout->addLayout(right);

  auto mainwidget = new QWidget();
  mainwidget->setLayout(layout);

  this->setCentralWidget(mainwidget);
}

MainWindow::~MainWindow() {}

void MainWindow::onClick() {
  emit textChanged(textedit->toPlainText());
}

## mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtWebKitWidgets>
#include <QMainWindow>

class MainWindow : public QMainWindow {
  Q_OBJECT

public:
  MainWindow();
  ~MainWindow();

signals:
  void textChanged(QString s);

private slots:
  void onClick();

private:
  QTextEdit* textedit;
};

#endif

## QWebView_exchange-value.pro
QT += core gui webkitwidgets

TEMPLATE = app
TARGET = QWebView_exchange-value
INCLUDEPATH += .

HEADERS += mainwindow.h jsobj.h
SOURCES += main.cc mainwindow.cc jsobj.cc

CONFIG += c++11
	#include "jsobj.h"

	JsObj::JsObj(QObject *parent) : QObject(parent) {}

	void JsObj::setTextArea(QString s) {
	emit textAreaChanged(s);
	}

	void JsObj::setQTextEdit(QString s) {
	emit qTextEditChanged(s);
	}
	#ifndef JSOBJ_H
	#define JSOBJ_H

	#include <QtCore>
	#include <QString>

	class JsObj : public QObject {
	Q_OBJECT

	public:
	JsObj(QObject *parent = nullptr);

	signals:
	void textAreaChanged(QString);
	void qTextEditChanged(QString);

	public slots:
	void setTextArea(QString s);
	void setQTextEdit(QString s);
	};

	#endif
	#include <QApplication>
	#include "mainwindow.h"

	auto main(int argc, char **argv) -> int {
	QApplication app(argc, argv);

	MainWindow window;
	window.show();

	return app.exec();
	}
	#include "mainwindow.h"
	#include "jsobj.h"

	MainWindow::MainWindow() {
	textedit = new QTextEdit();

	auto jo = new JsObj();
	connect(this, SIGNAL(textChanged(QString)), jo, SLOT(setTextArea(QString)));
	connect(jo, SIGNAL(qTextEditChanged(QString)), textedit, SLOT(setPlainText(QString)));

	auto button = new QPushButton("Send to QWebView");
	connect(button, SIGNAL(clicked()), this, SLOT(onClick()));

	auto webview = new QWebView(this);
	webview->setMaximumWidth(400);
	webview->setMaximumHeight(400);
	webview->page()->mainFrame()->addToJavaScriptWindowObject("jsobj", jo);
	webview->setHtml(R"(
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<style>
	html {
	font: 16px/1.6 Roboto, 'Droid Sans', 'Hiragino Kaku Gothic ProN', sans-serif;
	}
	textarea {
	height: 200px;
	width: 100%;
	}
	</style>
	<script>
	jsobj.textAreaChanged.connect(function(s) {
	document.getElementById("test").value = s;
	});

	var onClick = function() {
	jsobj.setQTextEdit(document.getElementById("test").value);
	};
	</script>
	</head>
	<body>
	<p>QWebView</p>
	<textarea id="test"></textarea>
	<button onClick="onClick();">Send to QTextEdit</button>
	</body>
	</html>
	)");

	auto right = new QVBoxLayout();
	right->addWidget(new QLabel("QWidget"));
	right->addWidget(textedit);
	right->addWidget(button);

	auto layout = new QHBoxLayout();
	layout->addWidget(webview);
	layout->addLayout(right);

	auto mainwidget = new QWidget();
	mainwidget->setLayout(layout);

	this->setCentralWidget(mainwidget);
	}

	MainWindow::~MainWindow() {}

	void MainWindow::onClick() {
	emit textChanged(textedit->toPlainText());
	}
	#ifndef MAINWINDOW_H
	#define MAINWINDOW_H

	#include <QtWebKitWidgets>
	#include <QMainWindow>

	class MainWindow : public QMainWindow {
	Q_OBJECT

	public:
	MainWindow();
	~MainWindow();

	signals:
	void textChanged(QString s);

	private slots:
	void onClick();

	private:
	QTextEdit* textedit;
	};

	#endif
	QT += core gui webkitwidgets

	TEMPLATE = app
	TARGET = QWebView_exchange-value
	INCLUDEPATH += .

	HEADERS += mainwindow.h jsobj.h
	SOURCES += main.cc mainwindow.cc jsobj.cc

	CONFIG += c++11