Windows下Qt Creator中使用cef的一个学习例子

Posted 2021-03-17 我来乔23

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参考：https://blog.csdn.net/qq_31683775/article/details/84025025

qt中集成cef浏览器例子qtCefBrowser
参考上上篇文章，vs2017编译生成：libcef_dll_wrapper.lib(静态库，debug-MDd，release-MD)

qtCefBrowser工程结构如下：

qt代码如下：

qtCefBrowser.pro 

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#-------------------------------------------------
#
# Project created by QtCreator 2020-01-08T09:18:32
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = cefBrowser
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

SOURCES += main.cpp\\
    simple_app.cc \\
    simple_handler.cc \\
    widget.cpp

HEADERS  += simple_app.h \\
    simple_handler.h \\
    widget.h

CONFIG += debug_and_release

FORMS    += widget.ui

INCLUDEPATH+=$$PWD/cef/

LIBS += shell32.lib \\
kernel32.lib \\
user32.lib \\
ole32.lib \\
oleaut32.lib \\
gdi32.lib

CONFIG(debug, debug|release) {
    LIBS += $$PWD/cef/lib/debug/libcef.lib              \\
            $$PWD/cef/lib/debug/libcef_dll_wrapper.lib  \\
}else{
    LIBS += $$PWD/cef/lib/release/libcef.lib              \\
            $$PWD/cef/lib/release/libcef_dll_wrapper.lib  \\
}

RC_FILE += icon.rc

simple_app.h

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// Copyright (c) 2013 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.

#ifndef CEF_TESTS_CEFSIMPLE_SIMPLE_APP_H_
#define CEF_TESTS_CEFSIMPLE_SIMPLE_APP_H_

#include "include/cef_app.h"

// Implement application-level callbacks for the browser process.
class SimpleApp : public CefApp,
                  public CefBrowserProcessHandler {
public:
   SimpleApp();

  // CefApp methods:
  virtual CefRefPtr<CefBrowserProcessHandler> GetBrowserProcessHandler()
      OVERRIDE { return this; }

  // CefBrowserProcessHandler methods:
  virtual void OnContextInitialized() OVERRIDE;
  void OnBeforeCommandLineProcessing(const CefString & process_type, CefRefPtr<CefCommandLine> command_line);
private:
  // Include the default reference counting implementation.
  IMPLEMENT_REFCOUNTING(SimpleApp);
};

#endif  // CEF_TESTS_CEFSIMPLE_SIMPLE_APP_H_

simple_app.cc

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 simple_handler.h 

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// Copyright (c) 2013 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.

#ifndef CEF_TESTS_CEFSIMPLE_SIMPLE_HANDLER_H_
#define CEF_TESTS_CEFSIMPLE_SIMPLE_HANDLER_H_

#include "include/cef_client.h"
#include <list>
// List of existing browser windows. Only accessed on the CEF UI thread.
typedef std::list<CefRefPtr<CefBrowser> > BrowserList;
class Widget;
class SimpleHandler : public CefClient,
    public CefDisplayHandler,
    public CefLifeSpanHandler,
    public CefLoadHandler
{
public:
    SimpleHandler(Widget *widget);
    ~SimpleHandler();

    // Provide access to the single global instance of this object.
    static SimpleHandler *GetInstance();

    // CefClient methods:
    virtual CefRefPtr<CefDisplayHandler> GetDisplayHandler() OVERRIDE
    {
        return this;
    }
    virtual CefRefPtr<CefLifeSpanHandler> GetLifeSpanHandler() OVERRIDE
    {
        return this;
    }
    virtual CefRefPtr<CefLoadHandler> GetLoadHandler() OVERRIDE
    {
        return this;
    }

    // CefLifeSpanHandler methods:
    virtual void OnAfterCreated(CefRefPtr<CefBrowser> browser) OVERRIDE;
    virtual bool DoClose(CefRefPtr<CefBrowser> browser) OVERRIDE;
    virtual void OnBeforeClose(CefRefPtr<CefBrowser> browser) OVERRIDE;

    // CefLoadHandler methods:
    virtual void OnLoadError(CefRefPtr<CefBrowser> browser,
                             CefRefPtr<CefFrame> frame,
                             ErrorCode errorCode,
                             const CefString &errorText,
                             const CefString &failedUrl) OVERRIDE;

    // Request that all existing browser windows close.
    void CloseAllBrowsers(bool force_close);

    bool IsClosing() const
    {
        return is_closing_;
    }
    BrowserList GetBrowserList()
    {
        return browser_list_;
    }
private:
    BrowserList browser_list_;
    Widget *widget;

    bool is_closing_;

    // Include the default reference counting implementation.
    IMPLEMENT_REFCOUNTING(SimpleHandler);
};

#endif  // CEF_TESTS_CEFSIMPLE_SIMPLE_HANDLER_H_

 simple_handler.cc 

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// Copyright (c) 2013 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.

#include "simple_handler.h"

#include <sstream>
#include <string>

#include "include/base/cef_bind.h"
#include "include/cef_app.h"
#include "include/wrapper/cef_closure_task.h"
#include "include/wrapper/cef_helpers.h"
#include "widget.h"
namespace
{
    SimpleHandler *g_instance = NULL;
}  // namespace

SimpleHandler::SimpleHandler(Widget *w)
    : is_closing_(false)
{
    DCHECK(!g_instance);
    g_instance = this;
    this->widget = w;
}

SimpleHandler::~SimpleHandler()
{
    g_instance = NULL;
}

// static
SimpleHandler *SimpleHandler::GetInstance()
{
    return g_instance;
}

void SimpleHandler::OnAfterCreated(CefRefPtr<CefBrowser> browser)
{
    CEF_REQUIRE_UI_THREAD();

    // Add to the list of existing browsers.
    browser_list_.push_back(browser);
    int nID = browser->GetIdentifier();
    widget->browserId = nID;
}

bool SimpleHandler::DoClose(CefRefPtr<CefBrowser> browser)
{
    CEF_REQUIRE_UI_THREAD();

    // Closing the main window requires special handling. See the DoClose()
    // documentation in the CEF header for a detailed destription of this
    // process.
    if (browser_list_.size() == 1)
    {
        // Set a flag to indicate that the window close should be allowed.
        is_closing_ = true;
    }

    // Allow the close. For windowed browsers this will result in the OS close
    // event being sent.
    return false;
}

void SimpleHandler::OnBeforeClose(CefRefPtr<CefBrowser> browser)
{
    CEF_REQUIRE_UI_THREAD();

    // Remove from the list of existing browsers.
    BrowserList::iterator bit = browser_list_.begin();
    for (; bit != browser_list_.end(); ++bit)
    {
        if ((*bit)->IsSame(browser))
        {
            browser_list_.erase(bit);
            break;
        }
    }

    if (browser_list_.empty())
    {
        // All browser windows have closed. Quit the application message loop.
        CefQuitMessageLoop();
    }
}

void SimpleHandler::OnLoadError(CefRefPtr<CefBrowser> browser,
                                CefRefPtr<CefFrame> frame,
                                ErrorCode errorCode,
                                const CefString &errorText,
                                const CefString &failedUrl)
{
    CEF_REQUIRE_UI_THREAD();

    // Don\'t display an error for downloaded files.
    if (errorCode == ERR_ABORTED)
        return;

    // Display a load error message.
    std::stringstream ss;
    ss << "<html><body bgcolor=\\"white\\">"
       "<h2>Failed to load URL " << std::string(failedUrl) <<
       " with error " << std::string(errorText) << " (" << errorCode <<
       ").</h2></body></html>";
    frame->LoadString(ss.str(), failedUrl);
}

void SimpleHandler::CloseAllBrowsers(bool force_close)
{
    if (!CefCurrentlyOn(TID_UI))
    {
        // Execute on the UI thread.
        CefPostTask(TID_UI,
                    base::Bind(&SimpleHandler::CloseAllBrowsers, this, force_close));
        return;
    }

    if (browser_list_.empty())
        return;

    BrowserList::const_iterator it = browser_list_.begin();
    for (; it != browser_list_.end(); ++it)
        (*it)->GetHost()->CloseBrowser(force_close);
}

 widget.h

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#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include "simple_handler.h"
namespace Ui
{
    class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT
public:
    explicit Widget(QWidget *parent = nullptr);
    ~Widget();
    int browserId;

private:
    Ui::Widget *ui;
    CefRefPtr<SimpleHandler> m_browserEvent;
    CefRefPtr<CefBrowser> GetBrowserByID(int nWebBrowserID);

public slots:
    void onUrl();

};

#endif // WIDGET_H

 widget.cpp

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#include "widget.h"
#include "ui_widget.h"
#include <QDesktopWidget>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    HWND wnd = (HWND)ui->widget->winId();

    CefWindowInfo cefWndInfo;
    QString strUrl = "https://www.baidu.com";
    RECT winRect;

    QDesktopWidget *pDeskTop = QApplication::desktop();
    QRect qtRect = pDeskTop->screenGeometry();
    winRect.left = qtRect.left();
    winRect.top = qtRect.top();
    winRect.right = qtRect.right();
    winRect.bottom = qtRect.bottom();

    //将cef界面嵌入qt界面中
    cefWndInfo.SetAsChild(wnd, winRect);

    CefBrowserSettings cefBrowSetting;
    m_browserEvent = CefRefPtr<SimpleHandler>(new SimpleHandler(this));
    bool browser = CefBrowserHost::CreateBrowser(cefWndInfo, m_browserEvent, strUrl.toStdString(), cefBrowSetting, NULL);
    connect(ui->goButton, SIGNAL(clicked()), this, SLOT(onUrl()));
    showMaximized();
}

Widget::~Widget()
{
    delete ui;
}

CefRefPtr<CefBrowser> Widget::GetBrowserByID(int nWebBrowserID)
{
    BrowserList browserList = m_browserEvent->GetBrowserList();
    for (auto it = browserList.begin();
            it != browserList.end();
            ++it)
    {
        if (nWebBrowserID == it->get()->GetIdentifier())
        {
            return it->get();
        }
    }

    return nullptr;
}

void Widget::onUrl()
{
    CefRefPtr<CefBrowser> brower = GetBrowserByID(browserId);
    if (nullptr != brower)
    {
        brower->GetMainFrame()->LoadURL(ui->lineEdit->text().toStdString());
    }
}

widget.ui 

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>Widget</class>
<widget class="QWidget" name="Widget">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>711</width>
    <height>371</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>qt cef browser</string>
  </property>
  <layout class="QVBoxLayout" name="verticalLayout">
   <property name="spacing">
    <number>0</number>
   </property>
   <property name="leftMargin">
    <number>0</number>
   </property>
   <property name="topMargin">
    <number>0</number>
   </property>
   <property name="rightMargin">
    <number>0</number>
   </property>
   <property name="bottomMargin">
    <number>0</number>
   </property>
   <item>
    <widget class="QWidget" name="toolbar" native="true">
     <property name="minimumSize">
      <size>
       <width>0</width>
       <height>40</height>
      </size>
     </property>
     <property name="maximumSize">
      <size>
       <width>16777215</width>
       <height>40</height>
      </size>
     </property>
     <layout class="QHBoxLayout" name="horizontalLayout">
      <property name="spacing">
       <number>0</number>
      </property>
      <property name="leftMargin">
       <number>0</number>
      </property>
      <property name="topMargin">
       <number>0</number>
      </property>
      <property name="rightMargin">
       <number>0</number>
      </property>
      <property name="bottomMargin">
       <number>0</number>
      </property>
      <item>
       <widget class="QLineEdit" name="lineEdit">
        <property name="minimumSize">
         <size>
          <width>0</width>
          <height>40</height>
         </size>
        </property>
        <property name="maximumSize">
         <size>
          <width>16777215</width>
          <height>40</height>
         </size>
        </property>
        <property name="styleSheet">
         <string notr="true">font-size:16px;</string>
        </property>
        <property name="text">
         <string>http://www.baidu.com</string>
        </property>
        <property name="placeholderText">
         <string>Please input URL...</string>
        </property>
        <property name="clearButtonEnabled">
         <bool>true</bool>
        </property>
       </widget>
      </item>
      <item>
       <widget class="QPushButton" name="goButton">
        <property name="minimumSize">
         <size>
          <width>0</width>
          <height>40</height>
         </size>
        </property>
        <property name="maximumSize">
         <size>
          <width>16777215</width>
          <height>40</height>
         </size>
        </property>
        <property name="styleSheet">
         <string notr="true">font-size:15px;
font: 16pt "Arial";</string>
        </property>
        <property name="text">
         <string>Go</string>
        </property>
       </widget>
      </item>
     </layout>
    </widget>
   </item>
   <item>
    <widget class="QWidget" name="widget" native="true"/>
   </item>
  </layout>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections/>
</ui>

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