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authorIndrajith K L2022-12-03 17:00:20 +0530
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+## `term.ui`
+
+A V module for designing terminal UI apps
+
+#### Quickstart
+
+```v
+import term.ui as tui
+
+struct App {
+mut:
+ tui &tui.Context = 0
+}
+
+fn event(e &tui.Event, x voidptr) {
+ mut app := &App(x)
+ println(e)
+ if e.typ == .key_down && e.code == .escape {
+ exit(0)
+ }
+}
+
+fn frame(x voidptr) {
+ mut app := &App(x)
+
+ app.tui.clear()
+ app.tui.set_bg_color(r: 63, g: 81, b: 181)
+ app.tui.draw_rect(20, 6, 41, 10)
+ app.tui.draw_text(24, 8, 'Hello from V!')
+ app.tui.set_cursor_position(0, 0)
+
+ app.tui.reset()
+ app.tui.flush()
+}
+
+mut app := &App{}
+app.tui = tui.init(
+ user_data: app
+ event_fn: event
+ frame_fn: frame
+ hide_cursor: true
+)
+app.tui.run() ?
+```
+
+See the `/examples/term.ui/` folder for more usage examples.
+
+#### Configuration
+
+- `user_data voidptr` - a pointer to any `user_data`, it will be passed as the last argument to
+ each callback. Used for accessing your app context from the different callbacks.
+- `init_fn fn(voidptr)` - a callback that will be called after initialization
+ and before the first event / frame. Useful for initializing any user data.
+- `frame_fn fn(voidptr)` - a callback that will be fired on each frame,
+ at a rate of `frame_rate` frames per second.
+`event_fn fn(&Event, voidptr)` - a callback that will be fired for every event received.
+- `cleanup_fn fn(voidptr)` - a callback that will be fired once, before the application exits.
+- `fail_fn fn(string)` - a callback that will be fired
+ if a fatal error occurs during app initialization.
+- `buffer_size int = 256` - the internal size of the read buffer.
+ Increasing it may help in case you're missing events, but you probably shouldn't lower
+ this value unless you make sure you're still receiving all events. In general,
+ higher frame rates work better with lower buffer sizes, and vice versa.
+- `frame_rate int = 30` - the number of times per second that the `frame` callback will be fired.
+ 30fps is a nice balance between smoothness and performance,
+ but you can increase or lower it as you wish.
+- `hide_cursor bool` - whether to hide the mouse cursor. Useful if you want to use your own.
+- `capture_events bool` - sets the terminal into raw mode, which makes it intercept some
+ escape codes such as `ctrl + c` and `ctrl + z`.
+ Useful if you want to use those key combinations in your app.
+- `window_title string` - sets the title of the terminal window.
+ This may be changed later, by calling the `set_window_title()` method.
+- `reset []int = [1, 2, 3, 4, 6, 7, 8, 9, 11, 13, 14, 15, 19]` - a list of reset signals,
+ to setup handlers to cleanup the terminal state when they're received.
+ You should not need to change this, unless you know what you're doing.
+
+All of these fields may be omitted, in which case, the default value will be used.
+In the case of the various callbacks, they will not be fired if a handler has not been specified.
+
+
+#### FAQ
+
+Q: My terminal (doesn't receive events / doesn't print anything / prints gibberish characters),
+what's up with that?
+A: Please check if your terminal. The module has been tested with `xterm`-based terminals on Linux
+(like `gnome-terminal` and `konsole`), and `Terminal.app` and `iterm2` on macOS.
+If your terminal does not work, open an issue with the output of `echo $TERM`.
+
+Q: There are screen tearing issues when doing large prints
+A: This is an issue with how terminals render frames,
+as they may decide to do so in the middle of receiving a frame,
+and cannot be fully fixed unless your console implements the [synchronized updates spec](https://gitlab.com/gnachman/iterm2/-/wikis/synchronized-updates-spec).
+It can be reduced *drastically*, though, by using the rendering methods built in to the module,
+and by only painting frames when your app's content has actually changed.
+
+Q: Why does the module only emit `keydown` events, and not `keyup` like `sokol`/`gg`?
+A: It's because of the way terminals emit events. Every key event is received as a keypress,
+and there isn't a way of telling terminals to send keyboard events differently,
+nor a reliable way of converting these into `keydown` / `keyup` events.