kezhenxu94 commented on a change in pull request #56:
URL: https://github.com/apache/skywalking-cli/pull/56#discussion_r471929804
##
File path: display/graph/tree/list.go
##
@@ -0,0 +1,190 @@
+// Licensed to Apache Software Foundation (ASF) under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Apache Software Foundation (ASF) licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package tree
+
+import (
+ "fmt"
+ "strings"
+
+ d "github.com/apache/skywalking-cli/display/displayable"
+ "github.com/apache/skywalking-cli/graphql/schema"
+ "github.com/apache/skywalking-cli/graphql/trace"
+
+ ui "github.com/gizak/termui/v3"
+ "github.com/gizak/termui/v3/widgets"
+ "github.com/urfave/cli"
+
+ "github.com/apache/skywalking-cli/logger"
+)
+
+const DefaultPageSize = 15
+const keymap = " Keymap "
+const cc = ""
+
+func DisplayList(ctx *cli.Context, displayable *d.Displayable) error {
+ data := displayable.Data.(schema.TraceBrief)
+ condition := displayable.Condition.(*schema.TraceQueryCondition)
+ if err := ui.Init(); err != nil {
+ logger.Log.Fatalf("failed to initialize termui: %v", err)
+ }
+ defer ui.Close()
+
+ list := widgets.NewList()
+ list.TitleStyle.Fg = ui.ColorRed
+ list.TextStyle = ui.NewStyle(ui.ColorYellow)
+ list.WrapText = false
+
+ tree := widgets.NewTree()
+ tree.TextStyle = ui.NewStyle(ui.ColorYellow)
+ tree.WrapText = false
+ tree.TitleStyle.Fg = ui.ColorRed
+
+ help := widgets.NewParagraph()
+ help.WrapText = false
+ help.Title = keymap
+ help.Text = `[k ](fg:red,mod:bold) Scroll Up
+ [ ](fg:red,mod:bold) Scroll Up
+ [j ](fg:red,mod:bold) Scroll Down
+ [ ](fg:red,mod:bold) Scroll Down
+ [](fg:red,mod:bold) list Page Up
+ [](fg:red,mod:bold) list Page Down
+ [p ](fg:red,mod:bold) list Page Up
+ [n ](fg:red,mod:bold) list Page Down
+ [](fg:red,mod:bold) Scroll Half Page Up
+ [](fg:red,mod:bold) Scroll Half Page Down
+ [ ](fg:red,mod:bold) Scroll to Top
+ [](fg:red,mod:bold) Show Trace
+ [ ](fg:red,mod:bold) Scroll to Bottom
+ [q ](fg:red,mod:bold) Quit
+ [](fg:red,mod:bold) Quit
+`
+ draw(list, tree, help, data, 0, ctx, condition)
+ listenTracesKeyboard(list, tree, data, ctx, help, condition)
+
+ return nil
+}
+
+func draw(list *widgets.List, tree *widgets.Tree, help *widgets.Paragraph,
data schema.TraceBrief, showIndex int,
+ ctx *cli.Context, condition *schema.TraceQueryCondition) {
+ x, y := ui.TerminalDimensions()
+
+ if data.Total != 0 {
+ var traceID = data.Traces[showIndex].TraceIds[0]
+ list.Title = fmt.Sprintf("[ %d/%d %s]",
*condition.Paging.PageNum, totalPages(data.Total), traceID)
+ nodes, serviceNames := getNodeData(ctx, traceID)
+ tree.Title = fmt.Sprintf("[%s]", strings.Join(serviceNames,
"->"))
+ tree.SetNodes(nodes)
+ list.Rows = rows(data, x/4)
+ } else {
+ noData := "no data"
+ list.Title = noData
+ tree.Title = noData
+ }
+
+ list.SetRect(0, 0, x, y)
+ tree.SetRect(x/4, 0, x, y)
+ help.SetRect(x-x/7, 0, x, y)
+ tree.ExpandAll()
Review comment:
The reason why we cannot switch the focus between the `list` and `tree`
is that we manually set the rectangle area of them, by placing these widgets
into containers, the focus can be switched between them, refer to
`skywalking-cli/display/graph/linear/linear.go`
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