mirror of https://github.com/gdamore/tcell.git
87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
//go:build ignore
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// +build ignore
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// Copyright 2020 The TCell Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use file except in compliance with the License.
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// You may obtain a copy of the license at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"fmt"
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"os"
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"github.com/gdamore/tcell/v2"
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"github.com/gdamore/tcell/v2/encoding"
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"github.com/mattn/go-runewidth"
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)
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func emitStr(s tcell.Screen, x, y int, style tcell.Style, str string) {
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for _, c := range str {
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var comb []rune
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w := runewidth.RuneWidth(c)
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if w == 0 {
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comb = []rune{c}
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c = ' '
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w = 1
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}
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s.SetContent(x, y, c, comb, style)
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x += w
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}
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}
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func displayHelloWorld(s tcell.Screen) {
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w, h := s.Size()
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s.Clear()
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style := tcell.StyleDefault.Foreground(tcell.ColorCadetBlue.TrueColor()).Background(tcell.ColorWhite)
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emitStr(s, w/2-7, h/2, style, "Hello, World!")
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emitStr(s, w/2-9, h/2+1, tcell.StyleDefault, "Press ESC to exit.")
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s.Show()
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}
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// This program just prints "Hello, World!". Press ESC to exit.
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func main() {
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encoding.Register()
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s, e := tcell.NewScreen()
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if e != nil {
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fmt.Fprintf(os.Stderr, "%v\n", e)
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os.Exit(1)
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}
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if e := s.Init(); e != nil {
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fmt.Fprintf(os.Stderr, "%v\n", e)
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os.Exit(1)
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}
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defStyle := tcell.StyleDefault.
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Background(tcell.ColorBlack).
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Foreground(tcell.ColorWhite)
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s.SetStyle(defStyle)
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displayHelloWorld(s)
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for {
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switch ev := s.PollEvent().(type) {
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case *tcell.EventResize:
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s.Sync()
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displayHelloWorld(s)
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case *tcell.EventKey:
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if ev.Key() == tcell.KeyEscape {
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s.Fini()
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os.Exit(0)
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}
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}
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}
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}
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