QCefView应用和网页的交互
一、demo的主要项目文件
结合QCefView自带的demo代码
main.cpp
#include
#include <QCefContext.h>
#include “MainWindow.h”
int
main(int argc, char* argv[])
{
QApplication a(argc, argv);
// build QCefConfig
QCefConfig config;
config.setUserAgent(“QCefViewTest”);
config.setLogLevel(QCefConfig::LOGSEVERITY_DEFAULT);
///桥对象表示一个Javascript对象,它将被插入
///进入所有的浏览器和框架。该对象被指定用于通信
///在web内容中的Javascript和本地上下文(C/ c++)代码之间。
///该对象被设置为window对象的属性。这意味着它可以
///通过调用window获取。Javascript代码中的bridgeObject
config.setBridgeObjectName(“QCefClient”);//这个很关键
config.setRemoteDebuggingPort(9000);
config.setBackgroundColor(Qt::lightGray);
// WindowlessRenderingEnabled is set to true by default, set to false to disable the OSR mode
// config.setWindowlessRenderingEnabled(false);
// add command line args
config.addCommandLineSwitch(“use-mock-keychain”);
// config.addCommandLineSwitch(“disable-gpu”);
// config.addCommandLineSwitch(“enable-media-stream”);
// config.addCommandLineSwitch(“allow-file-access-from-files”);
// config.addCommandLineSwitch(“disable-spell-checking”);
// config.addCommandLineSwitch(“disable-site-isolation-trials”);
// config.addCommandLineSwitch(“enable-aggressive-domstorage-flushing”);
config.addCommandLineSwitchWithValue(“renderer-process-limit”, “1”);
config.setCachePath(QCoreApplication::applicationDirPath());
// config.addCommandLineSwitchWithValue(“disable-features”, “BlinkGenPropertyTrees,TranslateUI,site-per-process”);
// initialize QCefContext instance with config
QCefContext cefContext(&a, argc, argv, &config);
MainWindow w;
w.show();
return a.exec();
}
customcefview.h
#ifndef CUSTOMCEFVIEW_H
#define CUSTOMCEFVIEW_H
#include <include/QCefView.h>
#include “configurationTool/configuration.h”
#include “MessageDistribution.h”
class CustomCefView : public QCefView
{
Q_OBJECT
public:
CustomCefView(const QString& url, QWidget *parent);
~CustomCefView();
/*通过事件注册的方式,将消息发送给JS*/
void changeColor(); // 背景颜色发生改变
void languageChange(QString language); // 语言发生改变的槽函数
/接收JS端发送给Qt的消息/
protected slots:
virtual void onQCefUrlRequest(const QString& url) override;
virtual void onQCefQueryRequest(const QCefQuery& query) override;
virtual void onInvokeMethodNotify(int browserId, int frameId, const QString& method, const QVariantList& arguments) override;
void onLoadingStateChanged(bool isLoading, bool canGoBack, bool canGoForward) override;
void onLoadStart() override;
void onLoadEnd(int httpStatusCode) override;
void onLoadError(int errorCode, const QString &errorMsg, const QString &failedUrl) override;
private:
Configuration configuration; // 通讯配置工具
MessageDistributionHandle msgHandle;// 消息分发处理
};
#endif // CUSTOMCEFVIEW_H
对应的customcefview.cpp 中,我们来看如何实现事件注册,以及接收到JS消息后,Qt如何处理的:
#include <windows.h>
#include
#include
#include “customcefview.h”
- CustomCefView::CustomCefView(const QString& url, QWidget* parent)
- QCefView(url, parent)
{
}
CustomCefView::~CustomCefView() {}
/// 注册一个窗体颜色改变的事件==》Qt发送消息到网页端,网页端接受该事件消息后响应
void CustomCefView::changeColor()
{
qsrand(::GetTickCount());
QColor color(qrand());
//
QCefEvent event(“colorChangedEvent”);
event.setStringProperty(“color”, color.name()); // 定义事件属性参数
broadcastEvent(“colorChange”, event); // 广播事件
//
}
注册一个语言槽函数
void CustomCefView::languageChange(QString language) {
QCefEvent event(“languageChangedEvent”);
event.setStringProperty(“language”, language);
broadcastEvent(“languageChange”, event);
}
void CustomCefView::onQCefUrlRequest(const QString& url)
{
QString title(“QCef Url Request …[function] onQCefUrlRequest”);
QString text = QString(“Current Thread: QT_UI\r\n”
“Url: %1”)
.arg(url);
QMessageBox::information(this->window(), title, text);
}
/// 接收由JS发送过来的消息并回包
void CustomCefView::onQCefQueryRequest(const QCefQuery& query)
{
QString title(“QCef Query Request”);
QString text = QString(“Current Thread: QT_UI\r\n”
“Query: %1”)
.arg(query.reqeust());
QMessageBox::information(this->window(), title, text);
QString response = query.reqeust().toUpper();
query.setResponseResult(true, response);
responseQCefQuery(query);
}
/// 接受由JS发送的消息
void CustomCefView::onInvokeMethodNotify(int browserId, int frameId, const QString& method, const QVariantList& arguments)
{
/** 注意:JS端通过调用 invokeMethod 方法,实际上会有两个参数变量传递过来,
** 一个是 const QString& method, 通过method我们可以进行消息过滤,在Qt中进行消息分发处理
** 另一个是const QVariantList& arguments,通过变量类型我们可知,这个参数同时可以传递多种
** 不同类型的数据到Qt中来,我们可以通过解析消息体,做具体的业务处理。
**/
qDebug() << “[browserId]:” << browserId << " [frameId]:" << frameId << " [method]:" << method << “[arguments]:” << arguments;
if (0 == method.compare(“onDragAreaMouseDown”)) { // for test
HWND hWnd = ::GetAncestor((HWND)getCefWinId(), GA_ROOT);
// get current mouse cursor position
POINT pt;
::GetCursorPos(&pt);// in case the mouse is being captured, try to release it
::ReleaseCapture();// simulate that the mouse left button is down on the title area
::SendMessage(hWnd, WM_NCLBUTTONDOWN, HTCAPTION, POINTTOPOINTS(pt));
return;
}
else if (0 == method.compare(“configurationTool”)) { // 调用通讯配置工具
configuration.show();
}
else if (0 == method.compare(“openLuaEditor”)) { // 打开lua脚本编辑器
QString Luaparam(arguments.last().value());
msgHandle.luaScriptEditHandle(Luaparam);
}
else {
QString title(“QCef InvokeMethod Notify”);
QString text = QString(“Current Thread: QT_UI\r\n”
“Method: %1\r\n”
“Arguments: …”)
.arg(method);
QMessageBox::information(this->window(), title, text);
}
}
void CustomCefView::onLoadingStateChanged(bool isLoading, bool canGoBack, bool canGoForward)
{
qDebug() << “isLoading:” << isLoading << “canGoBack” << canGoBack << “canGoForward” << canGoForward;
}
void CustomCefView::onLoadStart()
{
qDebug() << “onLoadStart”;
}
void CustomCefView::onLoadEnd(int httpStatusCode)
{
qDebug() << “onLoadEnd” << httpStatusCode;
}
void CustomCefView::onLoadError(int errorCode, const QString &errorMsg, const QString &failedUrl)
{
qDebug() << “onLoadError” << errorCode << errorMsg << failedUrl;
}
二、QT与JS通讯
1、Qt发送消息给JS部分
void CustomCefView::changeColor()
{
qsrand(::GetTickCount());
QColor color(qrand());
/****************以注册消息事件的方式将消息从Qt发送到JS/
QCefEvent event(“colorChangedEvent”);
event.setStringProperty(“color”, color.name()); // 定义事件属性参数
broadcastEvent(“colorChange”, event); // 广播事件
/****************************************************************/
}
2、Qt接收JS消息部分
void CustomCefView::onInvokeMethodNotify(int browserId, int frameId, const QString& method, const QVariantList& arguments)
{
/** 注意:JS端通过调用 invokeMethod 方法,实际上会有两个参数变量传递过来,
** 一个是 const QString& method, 通过method我们可以进行消息过滤,在Qt中进行消息分发处理
** 另一个是const QVariantList& arguments,通过变量类型我们可知,这个参数同时可以传递多种
** 不同类型的数据到Qt中来,我们可以通过解析消息体,做具体的业务处理。
**/
qDebug() << “[browserId]:” << browserId << " [frameId]:" << frameId << " [method]:" << method << “[arguments]:” << arguments;
if (0 == method.compare(“onDragAreaMouseDown”)) { // for test
HWND hWnd = ::GetAncestor((HWND)getCefWinId(), GA_ROOT);
// get current mouse cursor position
POINT pt;
::GetCursorPos(&pt);// in case the mouse is being captured, try to release it
::ReleaseCapture();// simulate that the mouse left button is down on the title area
::SendMessage(hWnd, WM_NCLBUTTONDOWN, HTCAPTION, POINTTOPOINTS(pt));
return;
}
else if (0 == method.compare(“configurationTool”)) { // 调用通讯配置工具
configuration.show();
}
else if (0 == method.compare(“openLuaEditor”)) { // 打开lua脚本编辑器
QString Luaparam(arguments.last().value());
msgHandle.luaScriptEditHandle(Luaparam);
}
else {
QString title(“QCef InvokeMethod Notify”);
QString text = QString(“Current Thread: QT_UI\r\n”
“Method: %1\r\n”
“Arguments: …”)
.arg(method);
QMessageBox::information(this->window(), title, text);
}
}
3、html中如何处理Qt与JS通讯部分具体的消息收发的
Web Area
this message will be processed by native code.
百度
Open Popup
{"data" : { "rows" : { "flag_addr_label_id" : "0","font_size" : 11,"id" : 0,"name" : "test","save_bit_address_flag" : 0, "text" :"getHmiModel()","trigger_addr_label_ids" :"","trigger_addr_labels" : "","trigger_type" : 0,"type" : 1,"var_list" : ""}}}"
function onLoad() {
if (typeof (QCefClient) == ‘undefined’) {
return;
}
// 增加颜色改变事件的监听QCefClient.addEventListener("colorChange", onColorChanged);QCefClient.addEventListener("languageChange", onLanguageChanged);}
在onLoad() 方法中实际上是做了一个事件监听的,对应我们在Qt端注册的 ”colorChange“ 和"languageChange",当Qt端调用changeColor ()和languageChange()方法时,会触发对应的事件,JS端捕获该事件并做处理,实际上就是实现了Qt(发)==》JS(收)的一个通讯过程。
5、JS发送消息给Qt:
function onOpenConfigurationTool() {
QCefClient.invokeMethod(“configurationTool”, 1, false, “configurationTool”);
}
从上可以看到,在调用invokeMethod()方法时候,传递了4个参数,分别是:
method : [ string ] “configurationTool”
arguments: [ int ] 1
[ bool ] false
[ string ] “configurationTool”
结合我们在Qt讲到的接收JS消息和对应处理,一目了然了。