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", "summary", "rating", "actions")

	// Three cokumn layout
	layout3col.AddColumn("image")
	layout3col.AddColumn("header", "summary", "rating", "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, image, description, rating, actions)
	}

	return nil
}

我们可以在上面的文字中，看到：

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

它用来产生一个rating的PreviewWidget：即有rating，也有review，所以在设置“visible”中为both。

func (sc *MyScope) PerformAction(result *scopes.Result, metadata *scopes.ActionMetadata, widgetId, actionId string) (*scopes.ActivationResponse, error) {
	log.Printf("Perform action for widget=%s, action=%s\n", widgetId, 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 clone https://gitcafe.com/ubuntu/goscope_rating.git

我们可以在Terminal中:

$chmod +x *.sh

通过上述命令来使得.sh文件变为可以执行的文件

$./run.sh

通过上面的脚本执行，在Desktop上运行我们的Scope

$./build.sh -d

通过我们上面的脚本执行，可以编译goscope，并部署到手机中去

$./clean.sh

通过上面的脚本执行，清除所有的编译的中间文件

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