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v/vlib/term/ui/input_windows.c.v

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// Copyright (c) 2020-2021 Raúl Hernández. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module ui
import os
import time
const buf_size = 64
const ctx_ptr = &Context(unsafe { nil })
const stdin_at_startup = u32(0)
struct ExtraContext {
mut:
stdin_handle C.HANDLE
stdout_handle C.HANDLE
read_buf [buf_size]C.INPUT_RECORD
mouse_down MouseButton
}
fn restore_terminal_state() {
if unsafe { ui.ctx_ptr != 0 } {
if ui.ctx_ptr.cfg.use_alternate_buffer {
// clear the terminal and set the cursor to the origin
print('\x1b[2J\x1b[3J')
print('\x1b[?1049l')
flush_stdout()
}
C.SetConsoleMode(ui.ctx_ptr.stdin_handle, ui.stdin_at_startup)
}
load_title()
os.flush()
}
// init initializes the context of a windows console given the `cfg`.
pub fn init(cfg Config) &Context {
mut ctx := &Context{
cfg: cfg
}
// get the standard input handle
stdin_handle := C.GetStdHandle(C.STD_INPUT_HANDLE)
stdout_handle := C.GetStdHandle(C.STD_OUTPUT_HANDLE)
if stdin_handle == C.INVALID_HANDLE_VALUE {
panic('could not get stdin handle')
}
// save the current input mode, to be restored on exit
if !C.GetConsoleMode(stdin_handle, &ui.stdin_at_startup) {
panic('could not get stdin console mode')
}
// enable extended input flags (see https://stackoverflow.com/a/46802726)
// 0x80 == C.ENABLE_EXTENDED_FLAGS
if !C.SetConsoleMode(stdin_handle, 0x80) {
panic('could not set raw input mode')
}
// enable window and mouse input events.
if !C.SetConsoleMode(stdin_handle, C.ENABLE_WINDOW_INPUT | C.ENABLE_MOUSE_INPUT) {
panic('could not set raw input mode')
}
// store the current title, so restore_terminal_state can get it back
save_title()
if ctx.cfg.use_alternate_buffer {
// switch to the alternate buffer
print('\x1b[?1049h')
// clear the terminal and set the cursor to the origin
print('\x1b[2J\x1b[3J\x1b[1;1H')
flush_stdout()
}
if ctx.cfg.hide_cursor {
ctx.hide_cursor()
ctx.flush()
}
if ctx.cfg.window_title != '' {
print('\x1b]0;${ctx.cfg.window_title}\x07')
flush_stdout()
}
unsafe {
x := &ui.ctx_ptr
*x = ctx
}
C.atexit(restore_terminal_state)
for code in ctx.cfg.reset {
os.signal_opt(code, fn (_ os.Signal) {
mut c := unsafe { ui.ctx_ptr }
if unsafe { c != 0 } {
c.cleanup()
}
exit(0)
}) or {}
}
ctx.stdin_handle = stdin_handle
ctx.stdout_handle = stdout_handle
return ctx
}
// run starts the windows console or restarts if it was paused.
pub fn (mut ctx Context) run() ! {
frame_time := 1_000_000 / ctx.cfg.frame_rate
mut init_called := false
mut sw := time.new_stopwatch(auto_start: false)
mut sleep_len := 0
for {
if !init_called {
ctx.init()
init_called = true
}
if sleep_len > 0 {
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time.sleep(sleep_len * time.microsecond)
}
if !ctx.paused {
sw.restart()
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if ctx.cfg.event_fn != unsafe { nil } {
ctx.parse_events()
}
ctx.frame()
sw.pause()
e := sw.elapsed().microseconds()
sleep_len = frame_time - int(e)
ctx.frame_count++
}
}
}
fn (mut ctx Context) parse_events() {
nr_events := u32(0)
if !C.GetNumberOfConsoleInputEvents(ctx.stdin_handle, &nr_events) {
panic('could not get number of events in stdin')
}
if nr_events < 1 {
return
}
// print('$nr_events | ')
if !C.ReadConsoleInput(ctx.stdin_handle, &ctx.read_buf[0], ui.buf_size, &nr_events) {
panic('could not read from stdin')
}
for i in 0 .. nr_events {
// print('E ')
match int(ctx.read_buf[i].EventType) {
C.KEY_EVENT {
e := unsafe { ctx.read_buf[i].Event.KeyEvent }
ch := e.wVirtualKeyCode
ascii := unsafe { e.uChar.AsciiChar }
if e.bKeyDown == 0 {
continue
}
// we don't handle key_up events because they don't exist on linux...
// see: https://docs.microsoft.com/en-us/windows/win32/inputdev/virtual-key-codes
code := match int(ch) {
C.VK_BACK { KeyCode.backspace }
C.VK_RETURN { KeyCode.enter }
C.VK_PRIOR { KeyCode.page_up }
14...20 { KeyCode.null }
C.VK_NEXT { KeyCode.page_down }
C.VK_END { KeyCode.end }
C.VK_HOME { KeyCode.home }
C.VK_LEFT { KeyCode.left }
C.VK_UP { KeyCode.up }
C.VK_RIGHT { KeyCode.right }
C.VK_DOWN { KeyCode.down }
C.VK_INSERT { KeyCode.insert }
C.VK_DELETE { KeyCode.delete }
65...90 { unsafe { KeyCode(ch + 32) } } // letters
91...93 { KeyCode.null } // special keys
96...105 { unsafe { KeyCode(ch - 48) } } // numpad numbers
112...135 { unsafe { KeyCode(ch + 178) } } // f1 - f24
else { unsafe { KeyCode(ascii) } }
}
mut modifiers := Modifiers.ctrl
if e.dwControlKeyState & (0x1 | 0x2) != 0 {
modifiers.set(.alt)
}
if e.dwControlKeyState & (0x4 | 0x8) != 0 {
modifiers.set(.ctrl)
}
if e.dwControlKeyState & 0x10 != 0 {
modifiers.set(.shift)
}
mut event := &Event{
typ: .key_down
modifiers: modifiers
code: code
ascii: ascii
width: int(e.dwControlKeyState)
height: int(e.wVirtualKeyCode)
utf8: unsafe { e.uChar.UnicodeChar.str() }
}
ctx.event(event)
}
C.MOUSE_EVENT {
e := unsafe { ctx.read_buf[i].Event.MouseEvent }
sb_info := C.CONSOLE_SCREEN_BUFFER_INFO{}
if !C.GetConsoleScreenBufferInfo(ctx.stdout_handle, &sb_info) {
panic('could not get screenbuffer info')
}
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x := e.dwMousePosition.X + 1
y := int(e.dwMousePosition.Y) - sb_info.srWindow.Top + 1
mut modifiers := Modifiers.ctrl
if e.dwControlKeyState & (0x1 | 0x2) != 0 {
modifiers.set(.alt)
}
if e.dwControlKeyState & (0x4 | 0x8) != 0 {
modifiers.set(.ctrl)
}
if e.dwControlKeyState & 0x10 != 0 {
modifiers.set(.shift)
}
// TODO: handle capslock/numlock/etc?? events exist for those keys
match int(e.dwEventFlags) {
C.MOUSE_MOVED {
mut button := match int(e.dwButtonState) {
0 { MouseButton.unknown }
1 { MouseButton.left }
2 { MouseButton.right }
else { MouseButton.middle }
}
typ := if e.dwButtonState == 0 {
if ctx.mouse_down != .unknown {
button = ctx.mouse_down
ctx.mouse_down = .unknown
EventType.mouse_up
} else {
EventType.mouse_move
}
} else {
EventType.mouse_drag
}
ctx.event(&Event{
typ: typ
x: x
y: y
button: button
modifiers: modifiers
})
}
C.MOUSE_WHEELED {
ctx.event(&Event{
typ: .mouse_scroll
direction: if i16(e.dwButtonState >> 16) < 0 {
Direction.up
} else {
Direction.down
}
x: x
y: y
modifiers: modifiers
})
}
0x0008 /* C.MOUSE_HWHEELED */ {
ctx.event(&Event{
typ: .mouse_scroll
direction: if i16(e.dwButtonState >> 16) < 0 {
Direction.right
} else {
Direction.left
}
x: x
y: y
modifiers: modifiers
})
}
0 /* CLICK */, C.DOUBLE_CLICK {
button := match int(e.dwButtonState) {
0 { ctx.mouse_down }
1 { MouseButton.left }
2 { MouseButton.right }
else { MouseButton.middle }
}
ctx.mouse_down = button
ctx.event(&Event{
typ: .mouse_down
x: x
y: y
button: button
modifiers: modifiers
})
}
else {}
}
}
C.WINDOW_BUFFER_SIZE_EVENT {
// e := unsafe { ctx.read_buf[i].Event.WindowBufferSizeEvent }
sb := C.CONSOLE_SCREEN_BUFFER_INFO{}
if !C.GetConsoleScreenBufferInfo(ctx.stdout_handle, &sb) {
panic('could not get screenbuffer info')
}
w := sb.srWindow.Right - sb.srWindow.Left + 1
h := sb.srWindow.Bottom - sb.srWindow.Top + 1
utf8 := '(${ctx.window_width}, ${ctx.window_height}) -> (${w}, ${h})'
if w != ctx.window_width || h != ctx.window_height {
ctx.window_width, ctx.window_height = w, h
mut event := &Event{
typ: .resized
width: ctx.window_width
height: ctx.window_height
utf8: utf8
}
ctx.event(event)
}
}
// C.MENU_EVENT {
// e := unsafe { ctx.read_buf[i].Event.MenuEvent }
// }
// C.FOCUS_EVENT {
// e := unsafe { ctx.read_buf[i].Event.FocusEvent }
// }
else {}
}
}
}
[inline]
fn save_title() {
// restore the previously saved terminal title
print('\x1b[22;0t')
flush_stdout()
}
[inline]
fn load_title() {
// restore the previously saved terminal title
print('\x1b[23;0t')
flush_stdout()
}