在golang中如何使用rating-input来进行打分及评价

在我们之前的C++文章“利用rating-input PreviewWidget来对事物进行评价及打分”，我们已经展示了如何使用C++来在Scope中的Preview中对事物进行评价或打分。在今天的这篇文章中，我们将介绍如何在Go Scope中来做同样的事。我们可以通过这个例子来展示如何捕获在Go Preview中的按钮并得到它们的action id以进行分别的处理。

在Go文件中的Preview方法中：

unc (s *MyScope) Preview(result *scopes.Result,metadata *scopes.ActionMetadata,reply *scopes.PreviewReply,cancelled <-chan bool) error {
	layout1col := scopes.NewColumnLayout(1)
	layout2col := scopes.NewColumnLayout(2)
	layout3col := scopes.NewColumnLayout(3)

	// Single column layout
	layout1col.AddColumn("image","header","summary","rating","actions")

	// Two column layout
	layout2col.AddColumn("image")
	layout2col.AddColumn("header","actions")

	// Three cokumn layout
	layout3col.AddColumn("image")
	layout3col.AddColumn("header","actions")
	layout3col.AddColumn()

	// Register the layouts we just created
	reply.RegisterLayout(layout1col,layout2col,layout3col)

	header := scopes.NewPreviewWidget("header","header")

	// It has title and a subtitle properties
	header.AddAttributeMapping("title","title")
	header.AddAttributeMapping("subtitle","subtitle")

	// Define the image section
	image := scopes.NewPreviewWidget("image","image")
	// It has a single source property,mapped to the result's art property
	image.AddAttributeMapping("source","art")

	// Define the summary section
	description := scopes.NewPreviewWidget("summary","text")
	// It has a text property,mapped to the result's description property
	description.AddAttributeMapping("text","description")

	actions := scopes.NewPreviewWidget("actions","actions")
	actions.AddAttributeValue("actions",[]actionInfo{
		actionInfo{Id: "my_action",Label: "Close"},actionInfo{Id: "my_action2",Label: "Refresh"},})

	rating := scopes.NewPreviewWidget("rating","rating-input")
	rating.AddAttributeValue("visible","both")
	rating.AddAttributeValue("required","rating")

	var scope_data string
	metadata.ScopeData(scope_data)
	if len(scope_data) > 0 {
		extra := scopes.NewPreviewWidget("extra","text")
		extra.AddAttributeValue("text","test Text")
		reply.PushWidgets(header,image,description,actions,rating,extra)
	} else {
		reply.PushWidgets(header,actions)
	}

	return nil
}

	rating := scopes.NewPreviewWidget("rating","rating")

func (sc *MyScope) PerformAction(result *scopes.Result,widgetId,actionId string) (*scopes.ActivationResponse,error) {
	log.Printf("Perform action for widget=%s,action=%sn",actionId)
	
	// var scope_data interface{}
	var scope_data map[string]interface{}
	metadata.ScopeData(&scope_data)
	
	log.Println("rating: ",scope_data["rating"])
	log.Println("review: ",scope_data["review"])

	for key,value := range scope_data {
		log.Println("key: ",key)
		log.Println("value: ",value)		
	}
	
	if widgetId == "actions" && actionId == "my_action" {
		resp := scopes.NewActivationResponse(scopes.ActivationHideDash)
		resp.SetScopeData([]string{"hello","world"})
		return resp,nil
	} 

	return scopes.NewActivationResponse(scopes.ActivationShowPreview),nil
}

在Go 文件中实现上面的PerformAction就可以捕获在Preview中的按钮事件。我们在上面的代码中打印出rating及review的值。

运行我们的代码：

在运行时的输出：

整个项目的源码在：git clonehttps://gitcafe.com/ubuntu/goscope_rating.git

我们可以在Terminal中:

$chmod +x *.sh

$./run.sh

$./build.sh -d

$./clean.sh

（编辑：李大同）

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