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// Copyright 2016 The Go 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 text_test
import (
"fmt"
"image"
"os"
"golang.org/x/exp/shiny/text"
"golang.org/x/image/font"
"golang.org/x/image/math/fixed"
)
// toyFace implements the font.Face interface by measuring every rune's width
// as 1 pixel.
type toyFace struct{}
func (toyFace) Close() error {
return nil
}
func (toyFace) Glyph(dot fixed.Point26_6, r rune) (image.Rectangle, image.Image, image.Point, fixed.Int26_6, bool) {
panic("unimplemented")
}
func (toyFace) GlyphBounds(r rune) (fixed.Rectangle26_6, fixed.Int26_6, bool) {
panic("unimplemented")
}
func (toyFace) GlyphAdvance(r rune) (fixed.Int26_6, bool) {
return fixed.I(1), true
}
func (toyFace) Kern(r0, r1 rune) fixed.Int26_6 {
return 0
}
func (toyFace) Metrics() font.Metrics {
return font.Metrics{}
}
func printFrame(f *text.Frame, softReturnsOnly bool) {
for p := f.FirstParagraph(); p != nil; p = p.Next(f) {
for l := p.FirstLine(f); l != nil; l = l.Next(f) {
for b := l.FirstBox(f); b != nil; b = b.Next(f) {
if softReturnsOnly {
os.Stdout.Write(b.TrimmedText(f))
} else {
os.Stdout.Write(b.Text(f))
}
}
if softReturnsOnly {
fmt.Println()
}
}
}
}
func Example() {
var f text.Frame
f.SetFace(toyFace{})
f.SetMaxWidth(fixed.I(60))
c := f.NewCaret()
c.WriteString(mobyDick)
c.Close()
fmt.Println("====")
printFrame(&f, false)
fmt.Println("====")
fmt.Println("123456789_123456789_123456789_123456789_123456789_123456789_")
printFrame(&f, true)
fmt.Println("====")
// Output:
// ====
// CHAPTER 1. Loomings.
// Call me Ishmael. Some years ago—never mind how long precisely—having little or no money in my purse, and nothing particular to interest me on shore, I thought I would sail about a little and see the watery part of the world...
// ====
// 123456789_123456789_123456789_123456789_123456789_123456789_
// CHAPTER 1. Loomings.
// Call me Ishmael. Some years ago—never mind how long
// precisely—having little or no money in my purse, and nothing
// particular to interest me on shore, I thought I would sail
// about a little and see the watery part of the world...
//
// ====
}
const mobyDick = "CHAPTER 1. Loomings.\nCall me Ishmael. Some years ago—never mind how long precisely—having little or no money in my purse, and nothing particular to interest me on shore, I thought I would sail about a little and see the watery part of the world...\n"
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