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主题

效果图 ​

download

下载事件 ​

go
package main

import (
	"embed"
	"fmt"
	"github.com/energye/energy/v2/cef"
	"github.com/energye/energy/v2/cef/ipc"
	"github.com/energye/energy/v2/pkgs/assetserve"
	"github.com/energye/golcl/lcl"
)

//资源目录，内置到执行程序中
//go:embed resources
var resources embed.FS

//这个示例使用了几个事件来演示下载文件
//在cef.BrowserWindow.SetBrowserInit初始化函数中设置event.SetOnBeforeDownload，用于设置保存目录
//并且设置event.SetOnDownloadUpdated获取下载进度信息
func main() {
	//全局初始化 每个应用都必须调用的
	cef.GlobalInit(nil, &resources)
	//创建应用
	cefApp := cef.NewApplication()
	//主窗口的配置
	//指定一个URL地址，或本地html文件目录
	cef.BrowserWindow.Config.Url = "http://localhost:22022/download.html"
	cef.BrowserWindow.Config.IconFS = "resources/icon.ico"
	//在主窗口初始化回调函数里设置浏览器事件
	cef.BrowserWindow.SetBrowserInit(func(event *cef.BrowserEvent, browserWindow cef.IBrowserWindow) {
		//下载更新事件
		//1. 返回下载进度
		//2. downloadItem 下载项
		//3. callback 下载状态的控制, 下载暂停，开始、取消
		//4. 将下载进度通过事件机制发送到html中展示
		event.SetOnDownloadUpdated(func(sender lcl.IObject, browser *cef.ICefBrowser, downloadItem *cef.ICefDownloadItem, callback *cef.ICefDownloadItemCallback) {
			//传递数据参数到html中
			//这些参数按下标顺序对应到js函数参数位置
			//演示只传递了几个参数
			fmt.Println("DownloadUpdated frameId", browser.MainFrame().Identifier(), "BeforeDownload Id:", downloadItem.Id(), "originalUrl:", downloadItem.OriginalUrl(), "url:", downloadItem.Url())
			fmt.Println("\t", downloadItem.State(), downloadItem.TotalBytes(), "/", downloadItem.ReceivedBytes(), "speed:", downloadItem.CurrentSpeed(), "fullPath", downloadItem.FullPath())
			ipc.Emit("downloadUpdateDemo", downloadItem.Id(), downloadItem.FullPath(), downloadItem.ReceivedBytes(), downloadItem.TotalBytes())
		})
	})
	//在主进程启动成功之后执行
	//在这里启动内置http服务
	//内置http服务需要使用 go:embed resources 内置资源到执行程序中
	cef.SetBrowserProcessStartAfterCallback(func(b bool) {
		fmt.Println("主进程启动 创建一个内置http服务")
		//通过内置http服务加载资源
		server := assetserve.NewAssetsHttpServer()
		server.PORT = 22022               //服务端口号
		server.AssetsFSName = "resources" //必须设置目录名和资源文件夹同名
		server.Assets = &resources
		go server.StartHttpServer()
	})
	//运行应用
	cef.Run(cefApp)
}

html代码示例 ​

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>下载文件示例</title>
    <script>
        console.log("下载文件示例")
        //使用ipc.on监听事件
        ipc.on("downloadUpdateDemo", function (id, suggestedFileName, receivedBytes, totalBytes) {
            console.log(id, suggestedFileName, receivedBytes, totalBytes)
            var downloadMessage = document.getElementById("downloadMessage")
            downloadMessage.innerHTML = downloadMessage.innerHTML + ("id: " + id + "  suggestedFileName: " + suggestedFileName + "  receivedBytes: " + receivedBytes + " / totalBytes: " + totalBytes) + "<br>"
        });
    </script>
</head>
<body style="overflow: hidden;margin: 10px;padding: 10px;">
<h3>download demo:</h3><br>
<a href="https://gitee.com/energye/energy/releases/download/v1.107.1.11/Windows%2032%20bits.zip">Windows 32 bits</a>
<br>
<a href="https://gitee.com/energye/energy/releases/download/v1.107.1.11/Windows%2064%20bits.zip">Windows 64 bits</a>
<br>
<a href="https://gitee.com/energye/energy/releases/download/v1.107.1.11/Linux%20x86%2064%20bits.zip">Linux x86 64
    bits</a> <br>
<a href="https://gitee.com/energye/energy/releases/download/v1.107.1.11/MacOSX%20x86%2064%20bits.zip">MacOSX x86 64
    bits</a> <br>
<div id="downloadMessage">

</div>
</body>
</html>

说明 ​

在回调函数BrowserWindow.SetBrowserInit设置事件监听 ​

cef.BrowserWindow.SetBrowserInit

下载之前事件-设置保存操作 ​

event.SetOnBeforeDownload

下载进度更新事件 ​

event.SetOnDownloadUpdated

linux下单独处理保存弹出框 ​

linuxDlSave := lcl.NewSaveDialog(browserWindow.Window)

进程启动后执行回调 ​

cef.SetBrowserProcessStartAfterCallback 在这里创建了内置http服务

GO
ENERGY

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