# termui [](https://travis-ci.org/gizak/termui) [](https://godoc.org/github.com/gizak/termui)
_*co-maintainer needed https://github.com/gizak/termui/issues/188_
`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.
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!)
## Installation
`master` mirrors v2 branch, to install:
go get -u github.com/gizak/termui
It is recommanded to use locked deps by using [dep](https://golang.github.io/dep/): move to `termui` src directory then run `dep ensure`.
For the compatible reason, you can choose to install the legacy version of `termui`:
go get gopkg.in/gizak/termui.v1
## Usage
### Layout
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.
__Absolute layout__
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:
`````go
import ui "github.com/gizak/termui" // <- ui shortcut, optional
func main() {
err := ui.Init()
if err != nil {
panic(err)
}
defer ui.Close()
p := ui.NewPar(":PRESS q TO QUIT DEMO")
p.Height = 3
p.Width = 50
p.TextFgColor = ui.ColorWhite
p.BorderLabel = "Text Box"
p.BorderFg = ui.ColorCyan
g := ui.NewGauge()
g.Percent = 50
g.Width = 50
g.Height = 3
g.Y = 11
g.BorderLabel = "Gauge"
g.BarColor = ui.ColorRed
g.BorderFg = ui.ColorWhite
g.BorderLabelFg = ui.ColorCyan
ui.Render(p, g) // feel free to call Render, it's async and non-block
// event handler...
}
`````
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).
__Grid layout:__
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).
```go
import ui "github.com/gizak/termui"
// init and create widgets...
// build
ui.Body.AddRows(
ui.NewRow(
ui.NewCol(6, 0, widget0),
ui.NewCol(6, 0, widget1)),
ui.NewRow(
ui.NewCol(3, 0, widget2),
ui.NewCol(3, 0, widget30, widget31, widget32),
ui.NewCol(6, 0, widget4)))
// calculate layout
ui.Body.Align()
ui.Render(ui.Body)
```
### Events
`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:
```go
// handle key q pressing
ui.Handle("/sys/kbd/q", func(ui.Event) {
// press q to quit
ui.StopLoop()
})
ui.Handle("/sys/kbd/C-x", func(ui.Event) {
// handle Ctrl + x combination
})
ui.Handle("/sys/kbd", func(ui.Event) {
// handle all other key pressing
})
// handle a 1s timer
ui.Handle("/timer/1s", func(e ui.Event) {
t := e.Data.(ui.EvtTimer)
// t is a EvtTimer
if t.Count%2 ==0 {
// do something
}
})
ui.Loop() // block until StopLoop is called
```
### Widgets
Click image to see the corresponding demo codes.
[
](https://github.com/gizak/termui/blob/master/_example/par.go)
[
](https://github.com/gizak/termui/blob/master/_example/list.go)
[
](https://github.com/gizak/termui/blob/master/_example/gauge.go)
[
](https://github.com/gizak/termui/blob/master/_example/linechart.go)
[
](https://github.com/gizak/termui/blob/master/_example/barchart.go)
[
](https://github.com/gizak/termui/blob/master/_example/mbarchart.go)
[
](https://github.com/gizak/termui/blob/master/_example/sparklines.go)
[
](https://github.com/gizak/termui/blob/master/_example/table.go)
## GoDoc
[godoc](https://godoc.org/github.com/gizak/termui)
## TODO
- [x] Grid layout
- [x] Event system
- [x] Canvas widget
- [x] Refine APIs
- [ ] Focusable widgets
## Changelog
## License
This library is under the [MIT License](http://opensource.org/licenses/MIT)