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126 lines
3.4 KiB
126 lines
3.4 KiB
// Copyright (c) 2013 by Michael Dvorkin. All Rights Reserved.
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//=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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package mop
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import (
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"fmt"
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"github.com/nsf/termbox-go"
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)
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type LineEditor struct {
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command rune
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prompt string
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cursor int
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input string
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}
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//-----------------------------------------------------------------------------
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func (self *LineEditor) Prompt(command rune) {
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prompts := map[rune]string{'+': `Add tickers: `, '-': `Remove tickers: `}
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if prompt, ok := prompts[command]; ok {
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self.prompt = prompt
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self.command = command
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DrawLine(0, 3, "<white>"+self.prompt+"</white>")
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termbox.SetCursor(len(self.prompt), 3)
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termbox.Flush()
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}
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}
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//-----------------------------------------------------------------------------
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func (self *LineEditor) Handle(ev termbox.Event) bool {
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defer termbox.Flush()
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switch ev.Key {
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case termbox.KeyEsc:
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ClearLine(0, 3)
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termbox.HideCursor()
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return true
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case termbox.KeyEnter:
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ClearLine(0, 3)
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termbox.HideCursor()
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return true
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case termbox.KeyBackspace, termbox.KeyBackspace2:
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self.delete_previous_character()
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case termbox.KeyCtrlB, termbox.KeyArrowLeft:
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self.move_left()
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case termbox.KeyCtrlF, termbox.KeyArrowRight:
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self.move_right()
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case termbox.KeyCtrlA:
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self.jump_to_beginning()
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case termbox.KeyCtrlE:
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self.jump_to_end()
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case termbox.KeySpace:
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self.insert_character(' ')
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default:
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if ev.Ch != 0 {
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self.insert_character(ev.Ch)
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}
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}
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DrawLine(20,20, fmt.Sprintf("cursor: %02d [%s] %08d", self.cursor, self.input, ev.Ch))
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return false
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}
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//-----------------------------------------------------------------------------
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func (self *LineEditor) delete_previous_character() {
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if self.cursor > 0 {
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if self.cursor < len(self.input) {
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// Remove character in the middle of the input string.
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self.input = self.input[0 : self.cursor-1] + self.input[self.cursor : len(self.input)]
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} else {
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// Remove last input character.
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self.input = self.input[ : len(self.input)-1]
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}
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DrawLine(len(self.prompt), 3, self.input + " ") // Erase last character.
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self.move_left()
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}
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}
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//-----------------------------------------------------------------------------
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func (self *LineEditor) insert_character(ch rune) {
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if self.cursor < len(self.input) {
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// Insert the character in the middle of the input string.
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self.input = self.input[0 : self.cursor] + string(ch) + self.input[self.cursor : len(self.input)]
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} else {
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// Append the character to the end of the input string.
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self.input += string(ch)
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}
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DrawLine(len(self.prompt), 3, self.input)
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self.move_right()
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}
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//-----------------------------------------------------------------------------
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func (self *LineEditor) move_left() {
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if self.cursor > 0 {
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self.cursor -= 1
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termbox.SetCursor(len(self.prompt) + self.cursor, 3)
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}
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}
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//-----------------------------------------------------------------------------
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func (self *LineEditor) move_right() {
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if self.cursor < len(self.input) {
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self.cursor += 1
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termbox.SetCursor(len(self.prompt) + self.cursor, 3)
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}
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}
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//-----------------------------------------------------------------------------
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func (self *LineEditor) jump_to_beginning() {
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self.cursor = 0
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termbox.SetCursor(len(self.prompt) + self.cursor, 3)
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}
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//-----------------------------------------------------------------------------
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func (self *LineEditor) jump_to_end() {
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self.cursor = len(self.input)
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termbox.SetCursor(len(self.prompt) + self.cursor, 3)
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}
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