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// Copyright 2020 The gocui Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gocui
import (
"github.com/gdamore/tcell/v2"
)
// We probably don't want this being a global variable for YOLO for now
var Screen tcell.Screen
// tcellInit initializes tcell screen for use.
func tcellInit() error {
if s, e := tcell.NewScreen(); e != nil {
return e
} else if e = s.Init(); e != nil {
return e
} else {
Screen = s
return nil
}
}
// tcellSetCell sets the character cell at a given location to the given
// content (rune) and attributes using provided OutputMode
func tcellSetCell(x, y int, ch rune, fg, bg Attribute, omode OutputMode) {
st := getTcellStyle(fg, bg, omode)
Screen.SetContent(x, y, ch, nil, st)
}
// getTcellStyle creates tcell.Style from Attributes
func getTcellStyle(fg, bg Attribute, omode OutputMode) tcell.Style {
st := tcell.StyleDefault
// extract colors and attributes
if fg != ColorDefault {
st = st.Foreground(getTcellColor(fg, omode))
st = setTcellFontEffectStyle(st, fg)
}
if bg != ColorDefault {
st = st.Background(getTcellColor(bg, omode))
st = setTcellFontEffectStyle(st, bg)
}
return st
}
// setTcellFontEffectStyle add additional attributes to tcell.Style
func setTcellFontEffectStyle(st tcell.Style, attr Attribute) tcell.Style {
if attr&AttrBold != 0 {
st = st.Bold(true)
}
if attr&AttrUnderline != 0 {
st = st.Underline(true)
}
if attr&AttrReverse != 0 {
st = st.Reverse(true)
}
if attr&AttrBlink != 0 {
st = st.Blink(true)
}
if attr&AttrDim != 0 {
st = st.Dim(true)
}
if attr&AttrItalic != 0 {
st = st.Italic(true)
}
if attr&AttrStrikeThrough != 0 {
st = st.StrikeThrough(true)
}
return st
}
// gocuiEventType represents the type of event.
type gocuiEventType uint8
// GocuiEvent represents events like a keys, mouse actions, or window resize.
// The 'Mod', 'Key' and 'Ch' fields are valid if 'Type' is 'eventKey'.
// The 'MouseX' and 'MouseY' fields are valid if 'Type' is 'eventMouse'.
// The 'Width' and 'Height' fields are valid if 'Type' is 'eventResize'.
// The 'Err' field is valid if 'Type' is 'eventError'.
type GocuiEvent struct {
Type gocuiEventType
Mod Modifier
Key Key
Ch rune
Width int
Height int
Err error
MouseX int
MouseY int
N int
}
// Event types.
const (
eventNone gocuiEventType = iota
eventKey
eventResize
eventMouse
eventInterrupt
eventError
eventRaw
)
const (
NOT_DRAGGING int = iota
MAYBE_DRAGGING
DRAGGING
)
var (
lastMouseKey tcell.ButtonMask = tcell.ButtonNone
lastMouseMod tcell.ModMask = tcell.ModNone
dragState int = NOT_DRAGGING
lastX int = 0
lastY int = 0
)
// pollEvent get tcell.Event and transform it into gocuiEvent
func pollEvent() GocuiEvent {
tev := Screen.PollEvent()
switch tev := tev.(type) {
case *tcell.EventInterrupt:
return GocuiEvent{Type: eventInterrupt}
case *tcell.EventResize:
w, h := tev.Size()
return GocuiEvent{Type: eventResize, Width: w, Height: h}
case *tcell.EventKey:
k := tev.Key()
ch := rune(0)
if k == tcell.KeyRune {
k = 0 // if rune remove key (so it can match rune instead of key)
ch = tev.Rune()
if ch == ' ' {
// special handling for spacebar
k = 32 // tcell keys ends at 31 or starts at 256
ch = rune(0)
}
}
mod := tev.Modifiers()
// remove control modifier and setup special handling of ctrl+spacebar, etc.
if mod == tcell.ModCtrl && k == 32 {
mod = 0
ch = rune(0)
k = tcell.KeyCtrlSpace
} else if mod == tcell.ModCtrl || mod == tcell.ModShift {
// remove Ctrl or Shift if specified
// - shift - will be translated to the final code of rune
// - ctrl - is translated in the key
mod = 0
} else if mod == tcell.ModAlt && k == tcell.KeyEnter {
// for the sake of convenience I'm having a KeyAltEnter key. I will likely
// regret this laziness in the future. We're arbitrarily mapping that to tcell's
// KeyF64.
mod = 0
k = tcell.KeyF64
}
return GocuiEvent{
Type: eventKey,
Key: Key(k),
Ch: ch,
Mod: Modifier(mod),
}
case *tcell.EventMouse:
x, y := tev.Position()
button := tev.Buttons()
mouseKey := MouseRelease
mouseMod := ModNone
// process mouse wheel
if button&tcell.WheelUp != 0 {
mouseKey = MouseWheelUp
}
if button&tcell.WheelDown != 0 {
mouseKey = MouseWheelDown
}
if button&tcell.WheelLeft != 0 {
mouseKey = MouseWheelLeft
}
if button&tcell.WheelRight != 0 {
mouseKey = MouseWheelRight
}
wheeling := mouseKey == MouseWheelUp || mouseKey == MouseWheelDown || mouseKey == MouseWheelLeft || mouseKey == MouseWheelRight
// process button events (not wheel events)
button &= tcell.ButtonMask(0xff)
if button != tcell.ButtonNone && lastMouseKey == tcell.ButtonNone {
lastMouseKey = button
lastMouseMod = tev.Modifiers()
switch button {
case tcell.ButtonPrimary:
mouseKey = MouseLeft
dragState = MAYBE_DRAGGING
lastX = x
lastY = y
case tcell.ButtonSecondary:
mouseKey = MouseRight
case tcell.ButtonMiddle:
mouseKey = MouseMiddle
}
}
switch tev.Buttons() {
case tcell.ButtonNone:
if lastMouseKey != tcell.ButtonNone {
switch lastMouseKey {
case tcell.ButtonPrimary:
dragState = NOT_DRAGGING
case tcell.ButtonSecondary:
case tcell.ButtonMiddle:
}
mouseMod = Modifier(lastMouseMod)
lastMouseMod = tcell.ModNone
lastMouseKey = tcell.ButtonNone
}
}
if !wheeling {
switch dragState {
case NOT_DRAGGING:
return GocuiEvent{Type: eventNone}
// if we haven't released the left mouse button and we've moved the cursor then we're dragging
case MAYBE_DRAGGING:
if x != lastX || y != lastY {
dragState = DRAGGING
}
case DRAGGING:
mouseMod = ModMotion
mouseKey = MouseLeft
}
}
return GocuiEvent{
Type: eventMouse,
MouseX: x,
MouseY: y,
Key: mouseKey,
Ch: 0,
Mod: mouseMod,
}
default:
return GocuiEvent{Type: eventNone}
}
}
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