112 lines
3.9 KiB
Go
112 lines
3.9 KiB
Go
/*
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Package tview implements rich widgets for terminal based user interfaces. The
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widgets provided with this package are useful for data exploration and data
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entry.
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Widgets
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The package implements the following widgets:
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- TextView: Scrollable windows that display multi-colored text. Text may also
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be highlighted.
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- Table: Scrollable display of tabular data. Table cells, rows, or columns may
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also be highlighted.
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- List: A navigable text list with optional keyboard shortcuts.
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- InputField: One-line input fields to enter text.
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- DropDown: Drop-down selection fields.
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- Checkbox: Selectable checkbox for boolean values.
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- Button: Buttons which get activated when the user selects them.
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- Form: Forms composed of input fields, drop down selections, checkboxes, and
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buttons.
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- Modal: A centered window with a text message and one or more buttons.
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- Flex: A Flexbox based layout manager.
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- Pages: A page based layout manager.
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The package also provides Application which is used to poll the event queue and
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draw widgets on screen.
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Hello World
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The following is a very basic example showing a box with the title "Hello,
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world!":
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package main
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import (
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"github.com/rivo/tview"
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)
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func main() {
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box := tview.NewBox().SetBorder(true).SetTitle("Hello, world!")
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if err := tview.NewApplication().SetRoot(box, true).Run(); err != nil {
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panic(err)
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}
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}
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First, we create a box primitive with a border and a title. Then we create an
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application, set the box as its root primitive, and run the event loop. The
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application exits when the application's Stop() function is called or when
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Ctrl-C is pressed.
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If we have a primitive which consumes key presses, we call the application's
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SetFocus() function to redirect all key presses to that primitive. Most
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primitives then offer ways to install handlers that allow you to react to any
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actions performed on them.
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More Demos
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You will find more demos in the "demos" subdirectory. It also contains a
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presentation (written using tview) which gives an overview of the different
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widgets and how they can be used.
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Colors
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Throughout this package, colors are specified using the tcell.Color type.
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Functions such as tcell.GetColor(), tcell.NewHexColor(), and tcell.NewRGBColor()
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can be used to create colors from W3C color names or RGB values.
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Almost all strings which are displayed can contain color tags. Color tags are
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W3C color names or six hexadecimal digits following a hash tag, wrapped in
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square brackets. Examples:
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This is a [red]warning[white]!
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The sky is [#8080ff]blue[#ffffff].
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A color tag changes the color of the characters following that color tag. This
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applies to almost everything from box titles, list text, form item labels, to
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table cells. In a TextView, this functionality has to be switched on explicitly.
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See the TextView documentation for more information.
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In the rare event that you want to display a string such as "[red]" or
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"[#00ff1a]" without applying its effect, you need to put an opening square
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bracket before the closing square bracket. Examples:
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[red[] will be output as [red]
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["123"[] will be output as ["123"]
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[#6aff00[[] will be output as [#6aff00[]
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Styles
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When primitives are instantiated, they are initialized with colors taken from
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the global Styles variable. You may change this variable to adapt the look and
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feel of the primitives to your preferred style.
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Unicode Support
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This package supports unicode characters including wide characters.
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Type Hierarchy
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All widgets listed above contain the Box type. All of Box's functions are
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therefore available for all widgets, too.
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All widgets also implement the Primitive interface. There is also the Focusable
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interface which is used to override functions in subclassing types.
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The tview package is based on https://maunium.net/go/tcell. It uses types
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and constants from that package (e.g. colors and keyboard values).
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This package does not process mouse input (yet).
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*/
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package tview
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