mirror of https://github.com/status-im/op-geth.git
152 lines
5.5 KiB
Markdown
152 lines
5.5 KiB
Markdown
# termui [](https://travis-ci.org/gizak/termui) [](https://godoc.org/github.com/gizak/termui)
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<img src="./_example/dashboard.gif" alt="demo cast under osx 10.10; Terminal.app; Menlo Regular 12pt.)" width="80%">
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`termui` is a cross-platform, easy-to-compile, and fully-customizable terminal dashboard. It is inspired by [blessed-contrib](https://github.com/yaronn/blessed-contrib), but purely in Go.
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Now version v2 has arrived! It brings new event system, new theme system, new `Buffer` interface and specific colour text rendering. (some docs are missing, but it will be completed soon!)
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## Installation
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`master` mirrors v2 branch, to install:
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go get -u github.com/gizak/termui
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It is recommanded to use locked deps by using [glide](https://glide.sh): move to `termui` src directory then run `glide up`.
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For the compatible reason, you can choose to install the legacy version of `termui`:
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go get gopkg.in/gizak/termui.v1
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## Usage
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### Layout
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To use `termui`, the very first thing you may want to know is how to manage layout. `termui` offers two ways of doing this, known as absolute layout and grid layout.
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__Absolute layout__
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Each widget has an underlying block structure which basically is a box model. It has border, label and padding properties. A border of a widget can be chosen to hide or display (with its border label), you can pick a different front/back colour for the border as well. To display such a widget at a specific location in terminal window, you need to assign `.X`, `.Y`, `.Height`, `.Width` values for each widget before sending it to `.Render`. Let's demonstrate these by a code snippet:
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`````go
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import ui "github.com/gizak/termui" // <- ui shortcut, optional
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func main() {
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err := ui.Init()
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if err != nil {
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panic(err)
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}
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defer ui.Close()
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p := ui.NewPar(":PRESS q TO QUIT DEMO")
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p.Height = 3
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p.Width = 50
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p.TextFgColor = ui.ColorWhite
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p.BorderLabel = "Text Box"
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p.BorderFg = ui.ColorCyan
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g := ui.NewGauge()
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g.Percent = 50
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g.Width = 50
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g.Height = 3
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g.Y = 11
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g.BorderLabel = "Gauge"
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g.BarColor = ui.ColorRed
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g.BorderFg = ui.ColorWhite
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g.BorderLabelFg = ui.ColorCyan
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ui.Render(p, g) // feel free to call Render, it's async and non-block
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// event handler...
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}
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`````
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Note that components can be overlapped (I'd rather call this a feature...), `Render(rs ...Renderer)` renders its args from left to right (i.e. each component's weight is arising from left to right).
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__Grid layout:__
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<img src="./_example/grid.gif" alt="grid" width="60%">
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Grid layout uses [12 columns grid system](http://www.w3schools.com/bootstrap/bootstrap_grid_system.asp) with expressive syntax. To use `Grid`, all we need to do is build a widget tree consisting of `Row`s and `Col`s (Actually a `Col` is also a `Row` but with a widget endpoint attached).
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```go
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import ui "github.com/gizak/termui"
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// init and create widgets...
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// build
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ui.Body.AddRows(
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ui.NewRow(
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ui.NewCol(6, 0, widget0),
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ui.NewCol(6, 0, widget1)),
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ui.NewRow(
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ui.NewCol(3, 0, widget2),
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ui.NewCol(3, 0, widget30, widget31, widget32),
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ui.NewCol(6, 0, widget4)))
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// calculate layout
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ui.Body.Align()
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ui.Render(ui.Body)
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```
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### Events
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`termui` ships with a http-like event mux handling system. All events are channeled up from different sources (typing, click, windows resize, custom event) and then encoded as universal `Event` object. `Event.Path` indicates the event type and `Event.Data` stores the event data struct. Add a handler to a certain event is easy as below:
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```go
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// handle key q pressing
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ui.Handle("/sys/kbd/q", func(ui.Event) {
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// press q to quit
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ui.StopLoop()
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})
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ui.Handle("/sys/kbd/C-x", func(ui.Event) {
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// handle Ctrl + x combination
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})
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ui.Handle("/sys/kbd", func(ui.Event) {
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// handle all other key pressing
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})
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// handle a 1s timer
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ui.Handle("/timer/1s", func(e ui.Event) {
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t := e.Data.(ui.EvtTimer)
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// t is a EvtTimer
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if t.Count%2 ==0 {
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// do something
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}
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})
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ui.Loop() // block until StopLoop is called
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```
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### Widgets
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Click image to see the corresponding demo codes.
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[<img src="./_example/par.png" alt="par" type="image/png" width="45%">](https://github.com/gizak/termui/blob/master/_example/par.go)
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[<img src="./_example/list.png" alt="list" type="image/png" width="45%">](https://github.com/gizak/termui/blob/master/_example/list.go)
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[<img src="./_example/gauge.png" alt="gauge" type="image/png" width="45%">](https://github.com/gizak/termui/blob/master/_example/gauge.go)
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[<img src="./_example/linechart.png" alt="linechart" type="image/png" width="45%">](https://github.com/gizak/termui/blob/master/_example/linechart.go)
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[<img src="./_example/barchart.png" alt="barchart" type="image/png" width="45%">](https://github.com/gizak/termui/blob/master/_example/barchart.go)
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[<img src="./_example/mbarchart.png" alt="barchart" type="image/png" width="45%">](https://github.com/gizak/termui/blob/master/_example/mbarchart.go)
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[<img src="./_example/sparklines.png" alt="sparklines" type="image/png" width="45%">](https://github.com/gizak/termui/blob/master/_example/sparklines.go)
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[<img src="./_example/table.png" alt="table" type="image/png" width="45%">](https://github.com/gizak/termui/blob/master/_example/table.go)
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## GoDoc
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[godoc](https://godoc.org/github.com/gizak/termui)
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## TODO
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- [x] Grid layout
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- [x] Event system
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- [x] Canvas widget
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- [x] Refine APIs
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- [ ] Focusable widgets
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## Changelog
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## License
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This library is under the [MIT License](http://opensource.org/licenses/MIT)
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