github.com/derailed/tview
github.com/derailed/tview
Package tview implements rich widgets for terminal based user interfaces. The widgets provided with this package are useful for data exploration and data entry. The package implements the following widgets: The package also provides Application which is used to poll the event queue and draw widgets on screen. The following is a very basic example showing a box with the title "Hello, world!": First, we create a box primitive with a border and a title. Then we create an application, set the box as its root primitive, and run the event loop. The application exits when the application's Stop() function is called or when Ctrl-C is pressed. If we have a primitive which consumes key presses, we call the application's SetFocus() function to redirect all key presses to that primitive. Most primitives then offer ways to install handlers that allow you to react to any actions performed on them. You will find more demos in the "demos" subdirectory. It also contains a presentation (written using tview) which gives an overview of the different widgets and how they can be used. Throughout this package, colors are specified using the tcell.Color type. Functions such as tcell.GetColor(), tcell.NewHexColor(), and tcell.NewRGBColor() can be used to create colors from W3C color names or RGB values. Almost all strings which are displayed can contain color tags. Color tags are W3C color names or six hexadecimal digits following a hash tag, wrapped in square brackets. Examples: A color tag changes the color of the characters following that color tag. This applies to almost everything from box titles, list text, form item labels, to table cells. In a TextView, this functionality has to be switched on explicitly. See the TextView documentation for more information. Color tags may contain not just the foreground (text) color but also the background color and additional flags. In fact, the full definition of a color tag is as follows: Each of the three fields can be left blank and trailing fields can be omitted. (Empty square brackets "[]", however, are not considered color tags.) Colors that are not specified will be left unchanged. A field with just a dash ("-") means "reset to default". You can specify the following flags (some flags may not be supported by your terminal): Examples: In the rare event that you want to display a string such as "[red]" or "[#00ff1a]" without applying its effect, you need to put an opening square bracket before the closing square bracket. Note that the text inside the brackets will be matched less strictly than region or colors tags. I.e. any character that may be used in color or region tags will be recognized. Examples: You can use the Escape() function to insert brackets automatically where needed. When primitives are instantiated, they are initialized with colors taken from the global Styles variable. You may change this variable to adapt the look and feel of the primitives to your preferred style. This package supports unicode characters including wide characters. Many functions in this package are not thread-safe. For many applications, this may not be an issue: If your code makes changes in response to key events, it will execute in the main goroutine and thus will not cause any race conditions. If you access your primitives from other goroutines, however, you will need to synchronize execution. The easiest way to do this is to call Application.QueueUpdate() or Application.QueueUpdateDraw() (see the function documentation for details): One exception to this is the io.Writer interface implemented by TextView. You can safely write to a TextView from any goroutine. See the TextView documentation for details. You can also call Application.Draw() from any goroutine without having to wrap it in QueueUpdate(). And, as mentioned above, key event callbacks are executed in the main goroutine and thus should not use QueueUpdate() as that may lead to deadlocks. All widgets listed above contain the Box type. All of Box's functions are therefore available for all widgets, too. All widgets also implement the Primitive interface. The tview package is based on https://github.com/derailed/tcell. It uses types and constants from that package (e.g. colors and keyboard values). This package does not process mouse input (yet).
- v0.8.2
- Version published
- Maintainers
- 0
Readme
Rich Interactive Widgets for Terminal UIs
This Go package provides commonly needed components for terminal based user interfaces.
Among these components are:
- Input forms (include input/password fields, drop-down selections, checkboxes, and buttons)
- Navigable multi-color text views
- Sophisticated navigable table views
- Flexible tree views
- Selectable lists
- Grid, Flexbox and page layouts
- Modal message windows
- An application wrapper
They come with lots of customization options and can be easily extended to fit your needs.
Installation
go get github.com/rivo/tview
Hello World
This basic example creates a box titled "Hello, World!" and displays it in your terminal:
package main
import (
"github.com/rivo/tview"
)
func main() {
box := tview.NewBox().SetBorder(true).SetTitle("Hello, world!")
if err := tview.NewApplication().SetRoot(box, true).Run(); err != nil {
panic(err)
}
}
Check out the GitHub Wiki for more examples along with screenshots. Or try the examples in the "demos" subdirectory.
For a presentation highlighting this package, compile and run the program found in the "demos/presentation" subdirectory.
Documentation
Refer to https://godoc.org/github.com/rivo/tview for the package's documentation.
Dependencies
This package is based on github.com/gdamore/tcell (and its dependencies) as well as on github.com/rivo/uniseg.
Your Feedback
Add your issue here on GitHub. Feel free to get in touch if you have any questions.
Version History
(There are no corresponding tags in the project. I only keep such a history in this README.)
- v0.20 (2019-07-08)
- Added autocomplete functionality to
InputField.
- Added autocomplete functionality to
- v0.19 (2018-10-28)
- Added
QueueUpdate()andQueueEvent()toApplicationto help with modifications to primitives from goroutines.
- Added
- v0.18 (2018-10-18)
InputFieldelements can now be navigated freely.
- v0.17 (2018-06-20)
- Added
TreeView.
- Added
- v0.15 (2018-05-02)
FlexandGriddon't clear their background per default, thus allowing for custom modals. See the Wiki for an example.
- v0.14 (2018-04-13)
- Added an
Escape()function which keep strings like color or region tags from being recognized as such. - Added
ANSIWriter()andTranslateANSI()which convert ANSI escape sequences totviewcolor tags.
- Added an
- v0.13 (2018-04-01)
- Added background colors and text attributes to color tags.
- v0.12 (2018-03-13)
- Added "suspended mode" to
Application.
- Added "suspended mode" to
- v0.11 (2018-03-02)
- Added a
RemoveItem()function toGridandFlex.
- Added a
- v0.10 (2018-02-22)
- Direct access to the
screenobject through callback inBox(i.e. for all primitives).
- Direct access to the
- v0.9 (2018-02-20)
- Introduced
Gridlayout. - Direct access to the
screenobject through callbacks inApplication.
- Introduced
- v0.8 (2018-01-17)
- Color tags can now be used almost everywhere.
- v0.7 (2018-01-16)
- Forms can now also have a horizontal layout.
- v0.6 (2018-01-14)
- All primitives can now intercept all key events when they have focus.
- Key events can also be intercepted globally (changed to a more general, consistent handling)
- v0.5 (2018-01-13)
TextViewnow has word wrapping and text alignment
- v0.4 (2018-01-12)
TextViewnow accepts color tags with any W3C color (including RGB hex values).- Support for wide unicode characters.
- v0.3 (2018-01-11)
- Added masking to
InputFieldand password entry toForm.
- Added masking to
- v0.2 (2018-01-10)
- Added
Stylesvariable with default colors for primitives. - Completed some missing InputField functions.
- Added
- v0.1 (2018-01-06)
- First Release.
FAQs
Package tview implements rich widgets for terminal based user interfaces. The widgets provided with this package are useful for data exploration and data entry. The package implements the following widgets: The package also provides Application which is used to poll the event queue and draw widgets on screen. The following is a very basic example showing a box with the title "Hello, world!": First, we create a box primitive with a border and a title. Then we create an application, set the box as its root primitive, and run the event loop. The application exits when the application's Stop() function is called or when Ctrl-C is pressed. If we have a primitive which consumes key presses, we call the application's SetFocus() function to redirect all key presses to that primitive. Most primitives then offer ways to install handlers that allow you to react to any actions performed on them. You will find more demos in the "demos" subdirectory. It also contains a presentation (written using tview) which gives an overview of the different widgets and how they can be used. Throughout this package, colors are specified using the tcell.Color type. Functions such as tcell.GetColor(), tcell.NewHexColor(), and tcell.NewRGBColor() can be used to create colors from W3C color names or RGB values. Almost all strings which are displayed can contain color tags. Color tags are W3C color names or six hexadecimal digits following a hash tag, wrapped in square brackets. Examples: A color tag changes the color of the characters following that color tag. This applies to almost everything from box titles, list text, form item labels, to table cells. In a TextView, this functionality has to be switched on explicitly. See the TextView documentation for more information. Color tags may contain not just the foreground (text) color but also the background color and additional flags. In fact, the full definition of a color tag is as follows: Each of the three fields can be left blank and trailing fields can be omitted. (Empty square brackets "[]", however, are not considered color tags.) Colors that are not specified will be left unchanged. A field with just a dash ("-") means "reset to default". You can specify the following flags (some flags may not be supported by your terminal): Examples: In the rare event that you want to display a string such as "[red]" or "[#00ff1a]" without applying its effect, you need to put an opening square bracket before the closing square bracket. Note that the text inside the brackets will be matched less strictly than region or colors tags. I.e. any character that may be used in color or region tags will be recognized. Examples: You can use the Escape() function to insert brackets automatically where needed. When primitives are instantiated, they are initialized with colors taken from the global Styles variable. You may change this variable to adapt the look and feel of the primitives to your preferred style. This package supports unicode characters including wide characters. Many functions in this package are not thread-safe. For many applications, this may not be an issue: If your code makes changes in response to key events, it will execute in the main goroutine and thus will not cause any race conditions. If you access your primitives from other goroutines, however, you will need to synchronize execution. The easiest way to do this is to call Application.QueueUpdate() or Application.QueueUpdateDraw() (see the function documentation for details): One exception to this is the io.Writer interface implemented by TextView. You can safely write to a TextView from any goroutine. See the TextView documentation for details. You can also call Application.Draw() from any goroutine without having to wrap it in QueueUpdate(). And, as mentioned above, key event callbacks are executed in the main goroutine and thus should not use QueueUpdate() as that may lead to deadlocks. All widgets listed above contain the Box type. All of Box's functions are therefore available for all widgets, too. All widgets also implement the Primitive interface. The tview package is based on https://github.com/derailed/tcell. It uses types and constants from that package (e.g. colors and keyboard values). This package does not process mouse input (yet).
We found that github.com/derailed/tview demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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