CEF3 笔记三(常用类的介绍)

淩亂°似流年 2022-05-08 06:38 356阅读 0赞

接上文《CEF3 笔记二(常用的类介绍)》

### CefBrowserHost 类介绍 ###

**CefBrowserHost: 该类在浏览器窗口来看代表了 browser 进程**，同时也暴露了与浏览器窗口相关的接口，该类的方法只能在 browser 进程中调用，但可以在 browser 进程的任意线程中被调用。该类的主要方法如下：

*  创建浏览器对象。

需要传入的参数包括 CefWindowInfo 对象，CefClient 对象，默认的 URL， 以及浏览器启动时参数设置。

public static bool CreateBrowser(const CefWindowInfo& windowInfo,
                           CefRefPtr<CefClient> client, const CefString& url,
                           const CefBrowserSettings& settings);

public static CefRefPtr<CefBrowser> CreateBrowserSync(
                      const CefWindowInfo& windowInfo,
                      CefRefPtr< CefClient > client,
                      const CefString& url, const CefBrowserSettings& settings);

*  请求关闭浏览器对象。该函数被调用是会触发 JS 'onbeforeunload' 事件，如果参数 force\_close为 false，并且提供了 onbeforeunload 事件的回调函数，则提示用户是否关闭浏览器，此时用户可以选取取消操作。如果 force\_close为 true，则直接关闭浏览器。

public virtual void CloseBrowser(bool force_close)= 0;

*  获取浏览器对象(**在 CefBrowser 类中可以通过调用 GetHost() 获取与之对应的 CefBrowserHos**t)

public virtual CefRefPtr< CefBrowser > GetBrowser()= 0;

*  获取 CefClient 对象

public virtual CefRefPtr< CefClient > GetClient()= 0;

*  获取该浏览器对象的窗口句柄，如果是弹出窗口，则返回 NULL。

public virtual CefWindowHandle GetOpenerWindowHandle()= 0;

### CefBrowser 类介绍 ###

**CefBrowser: 该类代表一个浏览器对象**，在 browser 进程中该类的方法可以被任意线程调用。在 render 进程中只能在主线程被调用。该类的主要方法包括：

![复制代码][copycode.gif]

// Returns the browser host object. This method can only be called in the
      // browser process.
      virtual CefRefPtr<CefBrowserHost> GetHost() =0;
    
      // Returns true if the browser can navigate backwards.
      virtual bool CanGoBack() =0;
    
      // Navigate backwards.
      virtual void GoBack() =0;
    
      // Returns true if the browser can navigate forwards.
      virtual bool CanGoForward() =0;
    
      // Navigate forwards.
      virtual void GoForward() =0;
    
      // Returns true if the browser is currently loading.
      virtual bool IsLoading() =0;
    
      // Reload the current page.
      virtual void Reload() =0;
    
      // Reload the current page ignoring any cached data.
      virtual void ReloadIgnoreCache() =0;
    
      // Stop loading the page.
      virtual void StopLoad() =0;
    
      // Returns the globally unique identifier for this browser.
      virtual int GetIdentifier() =0;
    
      // Returns true if this object is pointing to the same handle as |that|
      // object.
      virtual bool IsSame(CefRefPtr<CefBrowser> that) =0;
    
      // Returns true if the window is a popup window.
      virtual bool IsPopup() =0;
    
      // Returns true if a document has been loaded in the browser.
      virtual bool HasDocument() =0;
    
      // Returns the main (top-level) frame for the browser window.
      virtual CefRefPtr<CefFrame> GetMainFrame() =0;
    
      // Returns the focused frame for the browser window.
      virtual CefRefPtr<CefFrame> GetFocusedFrame() =0;
    
      // Returns the frame with the specified identifier, or NULL if not found.
      virtual CefRefPtr<CefFrame> GetFrame(int64 identifier) =0;
    
      // Returns the frame with the specified name, or NULL if not found.
      virtual CefRefPtr<CefFrame> GetFrame(const CefString& name) =0;
    
      // Returns the number of frames that currently exist.
      virtual size_t GetFrameCount() =0;
    
      // Returns the identifiers of all existing frames.
      virtual void GetFrameIdentifiers(std::vector<int64>& identifiers) =0;
    
      // Returns the names of all existing frames.
      virtual void GetFrameNames(std::vector<CefString>& names) =0;
    
      // Send a message to the specified |target_process|. Returns true if the
      // message was sent successfully.
      virtual bool SendProcessMessage(CefProcessId target_process,
                                      CefRefPtr<CefProcessMessage> message) =0;

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### CefFrame 类介绍 ###

**CefFrame: 表示浏览器窗口中的一个 frame**，在 browser 进程中该类的方法可以被任意线程调用（简单理解就是 Frame 标识一个页面，通过该类开发者可以加载某一URL 或者一段 HTML 代码，获取页面的源码和文本，URL，V8 执行上下文，访问页面中的 DOM）。该类的主要方法如下：

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// True if this object is currently attached to a valid frame.
      virtual bool IsValid() =0;
    
      // Execute undo in this frame.
      virtual void Undo() =0;
    
      // Execute redo in this frame.
      virtual void Redo() =0;
    
      // Execute cut in this frame.
      virtual void Cut() =0;
    
      // Execute copy in this frame.
      virtual void Copy() =0;
    
      // Execute paste in this frame.
      virtual void Paste() =0;
    
      // Execute delete in this frame.
      virtual void Delete() =0;
    
      // Execute select all in this frame.
      virtual void SelectAll() =0;
    
      // Save this frame's HTML source to a temporary file and open it in the
      // default text viewing application. This method can only be called from the
      // browser process.
      virtual void ViewSource() =0;
    
      // Retrieve this frame's HTML source as a string sent to the specified
      // visitor.
      virtual void GetSource(CefRefPtr<CefStringVisitor> visitor) =0;
    
      // Retrieve this frame's display text as a string sent to the specified
      // visitor.
      virtual void GetText(CefRefPtr<CefStringVisitor> visitor) =0;
    
      // Load the request represented by the |request| object.
      virtual void LoadRequest(CefRefPtr<CefRequest> request) =0;
    
      // Load the specified |url|.
      virtual void LoadURL(const CefString& url) =0;
    
      // Load the contents of |string_val| with the specified dummy |url|. |url|
      // should have a standard scheme (for example, http scheme) or behaviors like
      // link clicks and web security restrictions may not behave as expected.
      virtual void LoadString(const CefString& string_val,
                              const CefString& url) =0;
    
      // Execute a string of JavaScript code in this frame. The |script_url|
      // parameter is the URL where the script in question can be found, if any.
      // The renderer may request this URL to show the developer the source of the
      // error.  The |start_line| parameter is the base line number to use for error
      // reporting.
      virtual void ExecuteJavaScript(const CefString& code,
                                     const CefString& script_url,
                                     int start_line) =0;
    
      // Returns true if this is the main (top-level) frame.
      virtual bool IsMain() =0;
    
      // Returns true if this is the focused frame.
      virtual bool IsFocused() =0;
    
      // Returns the name for this frame. If the frame has an assigned name (for
      // example, set via the iframe "name" attribute) then that value will be
      // returned. Otherwise a unique name will be constructed based on the frame
      // parent hierarchy. The main (top-level) frame will always have an empty name
      // value.
      virtual CefString GetName() =0;
    
      // Returns the globally unique identifier for this frame.
      virtual int64 GetIdentifier() =0;
    
      // Returns the parent of this frame or NULL if this is the main (top-level)
      // frame.
      virtual CefRefPtr<CefFrame> GetParent() =0;
    
      // Returns the URL currently loaded in this frame.
      virtual CefString GetURL() =0;
    
      // Returns the browser that this frame belongs to.
      virtual CefRefPtr<CefBrowser> GetBrowser() =0;
    
      // Get the V8 context associated with the frame. This method can only be
      // called from the render process.
      virtual CefRefPtr<CefV8Context> GetV8Context() =0;
      
      // Visit the DOM document. This method can only be called from the render
      // process.
      virtual void VisitDOM(CefRefPtr<CefDOMVisitor> visitor) =0;

![复制代码][copycode.gif]

[https://www.cnblogs.com/haippy/archive/2013/06/10/3131253.html][https_www.cnblogs.com_haippy_archive_2013_06_10_3131253.html]

[copycode.gif]: /images/20220508/be6bd772e0fd40c8aab644ddc6626735.png
[https_www.cnblogs.com_haippy_archive_2013_06_10_3131253.html]: https://www.cnblogs.com/haippy/archive/2013/06/10/3131253.html