ios_project/proj.ios_mac/cocos2d-x/cocos/ui/webview/WebView.h

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 Copyright (c) 2014-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 http://www.cocos2d-x.org

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
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#pragma once

#include <functional>

#include "base/ccMacros.h"
#include "base/CCRef.h"
#include "base/CCData.h"
#include "base/ccConfig.h"

/**
 * @addtogroup ui
 * @{
 */

NS_CC_BEGIN

    class WebViewImpl;

/**
 * @brief A View that displays web pages.
 *
 * @note WebView displays web pages base on system widget.
 * It's mean WebView displays web pages above all graphical elements of cocos2d-x.
 * @js NA
 */
    class WebView : public Ref {
    public:
        /**
         * Allocates and initializes a WebView.
         */
        static WebView *create();

        /**
         * Set javascript interface scheme.
         *
         * @see WebView::setOnJSCallback()
         */
        void setJavascriptInterfaceScheme(const std::string &scheme);

        /**
         * Sets the main page contents, MIME type, content encoding, and base URL.
         *
         * @param data The content for the main page.
         * @param MIMEType The MIME type of the data.
         * @param encoding The encoding of the data.
         * @param baseURL The base URL for the content.
         */
        void loadData(const cocos2d::Data &data,
                      const std::string &MIMEType,
                      const std::string &encoding,
                      const std::string &baseURL);

        /**
         * Sets the main page content and base URL.
         *
         * @param string The content for the main page.
         * @param baseURL The base URL for the content.
         */
        void loadHTMLString(const std::string &string, const std::string &baseURL = "");

        /**
         * Loads the given URL.
         *
         * @param url Content URL.
         */
        void loadURL(const std::string &url);

        /**
         * Loads the given fileName.
         *
         * @param fileName Content fileName.
         */
        void loadFile(const std::string &fileName);

        /**
         * Stops the current load.
         */
        void stopLoading();

        /**
         * Reloads the current URL.
         */
        void reload();

        /**
         * Gets whether this WebView has a back history item.
         *
         * @return WebView has a back history item.
         */
        bool canGoBack();

        /**
         * Gets whether this WebView has a forward history item.
         *
         * @return WebView has a forward history item.
         */
        bool canGoForward();

        /**
         * Goes back in the history.
         */
        void goBack();

        /**
         * Goes forward in the history.
         */
        void goForward();

        /**
         * Evaluates JavaScript in the context of the currently displayed page.
         */
        void evaluateJS(const std::string &js);

        /**
         * Set WebView should support zooming. The default value is false.
         */
        void setScalesPageToFit(const bool scalesPageToFit);

        /**
         * Call before a web view begins loading.
         *
         * @param callback The web view that is about to load new content.
         * @return YES if the web view should begin loading content; otherwise, NO.
         */
        void setOnShouldStartLoading(
                const std::function<bool(WebView *sender, const std::string &url)> &callback);

        /**
         * A callback which will be called when a WebView event happens.
         */
        typedef std::function<void(WebView *sender, const std::string &url)> ccWebViewCallback;

        /**
         * Call after a web view finishes loading.
         *
         * @param callback The web view that has finished loading.
         */
        void setOnDidFinishLoading(const ccWebViewCallback &callback);

        /**
         * Call if a web view failed to load content.
         *
         * @param callback The web view that has failed loading.
         */
        void setOnDidFailLoading(const ccWebViewCallback &callback);

        /**
         * This callback called when load URL that start with javascript interface scheme.
         */
        void setOnJSCallback(const ccWebViewCallback &callback);

        /**
         * Get the callback when WebView is about to start.
         */
        std::function<bool(WebView *sender, const std::string &url)>
        getOnShouldStartLoading() const;

        /**
         * Get the callback when WebView has finished loading.
         */
        ccWebViewCallback getOnDidFinishLoading() const;

        /**
         * Get the callback when WebView has failed loading.
         */
        ccWebViewCallback getOnDidFailLoading() const;

        /**
         *Get the Javascript callback.
         */
        ccWebViewCallback getOnJSCallback() const;

        /**
         * Set whether the webview bounces at end of scroll of WebView.
         */
        void setBounces(bool bounce);

        /**
         * Toggle visibility of WebView.
         */
        virtual void setVisible(bool visible);

        /**
         * Set the rect of WebView.
         */
        virtual void setFrame(float x, float y, float width, float height);
        
        /**
         * Set the background transparent
         */
        virtual void setBackgroundTransparent(bool isTransparent);

    protected:

        std::function<bool(WebView *sender, const std::string &url)> _onShouldStartLoading;

        ccWebViewCallback _onDidFinishLoading;

        ccWebViewCallback _onDidFailLoading;

        ccWebViewCallback _onJSCallback;

    CC_CONSTRUCTOR_ACCESS:

        /**
         * Default constructor.
         */
        WebView();

        /**
         * Default destructor.
         */
        virtual ~WebView();

    private:
        WebViewImpl *_impl;

        friend class WebViewImpl;
    };

NS_CC_END