mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 03:38:55 +01:00
358 lines
8.3 KiB
Go
358 lines
8.3 KiB
Go
// Copyright 2023 The Ebitengine Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package main
|
|
|
|
import (
|
|
"image"
|
|
"image/color"
|
|
"log"
|
|
"math"
|
|
"strings"
|
|
"unicode/utf8"
|
|
|
|
"github.com/hajimehoshi/bitmapfont/v3"
|
|
"golang.org/x/image/font"
|
|
"golang.org/x/image/math/fixed"
|
|
|
|
"github.com/hajimehoshi/ebiten/v2"
|
|
"github.com/hajimehoshi/ebiten/v2/exp/textinput"
|
|
"github.com/hajimehoshi/ebiten/v2/inpututil"
|
|
"github.com/hajimehoshi/ebiten/v2/text"
|
|
"github.com/hajimehoshi/ebiten/v2/vector"
|
|
)
|
|
|
|
var fontFace = bitmapfont.FaceEA
|
|
|
|
const (
|
|
screenWidth = 640
|
|
screenHeight = 480
|
|
)
|
|
|
|
type TextField struct {
|
|
bounds image.Rectangle
|
|
multilines bool
|
|
text string
|
|
selectionStart int
|
|
selectionEnd int
|
|
focused bool
|
|
|
|
ch chan textinput.State
|
|
end func()
|
|
state textinput.State
|
|
}
|
|
|
|
func NewTextField(bounds image.Rectangle, multilines bool) *TextField {
|
|
return &TextField{
|
|
bounds: bounds,
|
|
multilines: multilines,
|
|
}
|
|
}
|
|
|
|
func (t *TextField) Contains(x, y int) bool {
|
|
return image.Pt(x, y).In(t.bounds)
|
|
}
|
|
|
|
func (t *TextField) SetSelectionStartByCursorPosition(x, y int) bool {
|
|
idx, ok := t.textIndexByCursorPosition(x, y)
|
|
if !ok {
|
|
return false
|
|
}
|
|
|
|
t.selectionStart = idx
|
|
t.selectionEnd = idx
|
|
return true
|
|
}
|
|
|
|
func (t *TextField) textIndexByCursorPosition(x, y int) (int, bool) {
|
|
if !t.Contains(x, y) {
|
|
return 0, false
|
|
}
|
|
|
|
x -= t.bounds.Min.X
|
|
y -= t.bounds.Min.Y
|
|
px, py := textFieldPadding()
|
|
x -= px
|
|
y -= py
|
|
if x < 0 {
|
|
x = 0
|
|
}
|
|
if y < 0 {
|
|
y = 0
|
|
}
|
|
|
|
lineHeight := fontFace.Metrics().Height.Ceil()
|
|
var nlCount int
|
|
var lineStart int
|
|
var prevAdvance fixed.Int26_6
|
|
for i, r := range t.text {
|
|
var x0, x1 int
|
|
currentAdvance := font.MeasureString(fontFace, t.text[lineStart:i])
|
|
if lineStart < i {
|
|
x0 = ((prevAdvance + currentAdvance) / 2).Ceil()
|
|
}
|
|
if r == '\n' {
|
|
x1 = int(math.MaxInt32)
|
|
} else if i < len(t.text) {
|
|
nextI := i + 1
|
|
for !utf8.ValidString(t.text[i:nextI]) {
|
|
nextI++
|
|
}
|
|
nextAdvance := font.MeasureString(fontFace, t.text[lineStart:nextI])
|
|
x1 = ((currentAdvance + nextAdvance) / 2).Ceil()
|
|
} else {
|
|
x1 = currentAdvance.Ceil()
|
|
}
|
|
if x0 <= x && x < x1 && nlCount*lineHeight <= y && y < (nlCount+1)*lineHeight {
|
|
return i, true
|
|
}
|
|
prevAdvance = currentAdvance
|
|
|
|
if r == '\n' {
|
|
nlCount++
|
|
lineStart = i + 1
|
|
prevAdvance = 0
|
|
}
|
|
}
|
|
|
|
return len(t.text), true
|
|
}
|
|
|
|
func (t *TextField) Focus() {
|
|
t.focused = true
|
|
}
|
|
|
|
func (t *TextField) Blur() {
|
|
t.focused = false
|
|
}
|
|
|
|
func (t *TextField) Update() {
|
|
if !t.focused {
|
|
if t.end != nil {
|
|
t.end()
|
|
t.ch = nil
|
|
t.end = nil
|
|
t.state = textinput.State{}
|
|
}
|
|
return
|
|
}
|
|
|
|
var processed bool
|
|
for {
|
|
if t.ch == nil {
|
|
x, y := t.bounds.Min.X, t.bounds.Min.Y
|
|
cx, cy := t.cursorPos()
|
|
px, py := textFieldPadding()
|
|
x += cx + px
|
|
y += cy + py + fontFace.Metrics().Ascent.Ceil()
|
|
t.ch, t.end = textinput.Start(x, y)
|
|
// Start returns nil for non-supported envrionments.
|
|
if t.ch == nil {
|
|
return
|
|
}
|
|
}
|
|
|
|
readchar:
|
|
for {
|
|
select {
|
|
case state, ok := <-t.ch:
|
|
processed = true
|
|
if !ok {
|
|
t.ch = nil
|
|
t.end = nil
|
|
t.state = textinput.State{}
|
|
break readchar
|
|
}
|
|
if state.Committed {
|
|
t.text = t.text[:t.selectionStart] + state.Text + t.text[t.selectionEnd:]
|
|
t.selectionStart += len(state.Text)
|
|
t.selectionEnd = t.selectionStart
|
|
state = textinput.State{}
|
|
continue
|
|
}
|
|
t.state = state
|
|
default:
|
|
break readchar
|
|
}
|
|
}
|
|
|
|
if t.ch == nil {
|
|
continue
|
|
}
|
|
|
|
break
|
|
}
|
|
|
|
if processed {
|
|
return
|
|
}
|
|
|
|
switch {
|
|
case inpututil.IsKeyJustPressed(ebiten.KeyEnter):
|
|
if t.multilines {
|
|
t.text = t.text[:t.selectionStart] + "\n" + t.text[t.selectionEnd:]
|
|
t.selectionStart += 1
|
|
t.selectionEnd = t.selectionStart
|
|
}
|
|
case inpututil.IsKeyJustPressed(ebiten.KeyBackspace):
|
|
if t.selectionStart > 0 {
|
|
// TODO: Remove a grapheme instead of a code point.
|
|
_, l := utf8.DecodeLastRuneInString(t.text[:t.selectionStart])
|
|
t.text = t.text[:t.selectionStart-l] + t.text[t.selectionEnd:]
|
|
t.selectionStart -= l
|
|
}
|
|
t.selectionEnd = t.selectionStart
|
|
case inpututil.IsKeyJustPressed(ebiten.KeyLeft):
|
|
if t.selectionStart > 0 {
|
|
// TODO: Remove a grapheme instead of a code point.
|
|
_, l := utf8.DecodeLastRuneInString(t.text[:t.selectionStart])
|
|
t.selectionStart -= l
|
|
}
|
|
t.selectionEnd = t.selectionStart
|
|
case inpututil.IsKeyJustPressed(ebiten.KeyRight):
|
|
if t.selectionEnd < len(t.text) {
|
|
// TODO: Remove a grapheme instead of a code point.
|
|
_, l := utf8.DecodeRuneInString(t.text[t.selectionEnd:])
|
|
t.selectionEnd += l
|
|
}
|
|
t.selectionStart = t.selectionEnd
|
|
}
|
|
|
|
if !t.multilines {
|
|
orig := t.text
|
|
new := strings.ReplaceAll(orig, "\n", "")
|
|
if new != orig {
|
|
t.selectionStart -= strings.Count(orig[:t.selectionStart], "\n")
|
|
t.selectionEnd -= strings.Count(orig[:t.selectionEnd], "\n")
|
|
}
|
|
}
|
|
}
|
|
|
|
func (t *TextField) cursorPos() (int, int) {
|
|
var nlCount int
|
|
lastNLPos := -1
|
|
for i, r := range t.text[:t.selectionStart] {
|
|
if r == '\n' {
|
|
nlCount++
|
|
lastNLPos = i
|
|
}
|
|
}
|
|
|
|
txt := t.text[lastNLPos+1 : t.selectionStart]
|
|
if t.state.Text != "" {
|
|
txt += t.state.Text[:t.state.CompositionSelectionStartInBytes]
|
|
}
|
|
x := font.MeasureString(fontFace, txt).Ceil()
|
|
y := nlCount * fontFace.Metrics().Height.Ceil()
|
|
return x, y
|
|
}
|
|
|
|
func (t *TextField) Draw(screen *ebiten.Image) {
|
|
vector.DrawFilledRect(screen, float32(t.bounds.Min.X), float32(t.bounds.Min.Y), float32(t.bounds.Dx()), float32(t.bounds.Dy()), color.White, false)
|
|
var clr color.Color = color.Black
|
|
if t.focused {
|
|
clr = color.RGBA{0, 0, 0xff, 0xff}
|
|
}
|
|
vector.StrokeRect(screen, float32(t.bounds.Min.X), float32(t.bounds.Min.Y), float32(t.bounds.Dx()), float32(t.bounds.Dy()), 1, clr, false)
|
|
|
|
px, py := textFieldPadding()
|
|
if t.focused && t.selectionStart >= 0 {
|
|
x, y := t.bounds.Min.X, t.bounds.Min.Y
|
|
cx, cy := t.cursorPos()
|
|
x += px + cx
|
|
y += py + cy
|
|
h := fontFace.Metrics().Height.Ceil()
|
|
vector.StrokeLine(screen, float32(x), float32(y), float32(x), float32(y+h), 1, color.Black, false)
|
|
}
|
|
|
|
shownText := t.text
|
|
if t.focused && t.state.Text != "" {
|
|
shownText = t.text[:t.selectionStart] + t.state.Text + t.text[t.selectionEnd:]
|
|
}
|
|
|
|
tx := t.bounds.Min.X + px
|
|
ty := t.bounds.Min.Y + py + fontFace.Metrics().Ascent.Ceil()
|
|
text.Draw(screen, shownText, fontFace, tx, ty, color.Black)
|
|
}
|
|
|
|
const textFieldHeight = 24
|
|
|
|
func textFieldPadding() (int, int) {
|
|
m := fontFace.Metrics()
|
|
return 4, (textFieldHeight - m.Height.Ceil()) / 2
|
|
}
|
|
|
|
type Game struct {
|
|
textFields []*TextField
|
|
}
|
|
|
|
func (g *Game) Update() error {
|
|
if g.textFields == nil {
|
|
g.textFields = append(g.textFields, NewTextField(image.Rect(16, 16, screenWidth-16, 16+textFieldHeight), false))
|
|
g.textFields = append(g.textFields, NewTextField(image.Rect(16, 48, screenWidth-16, 48+textFieldHeight), false))
|
|
g.textFields = append(g.textFields, NewTextField(image.Rect(16, 80, screenWidth-16, screenHeight-16), true))
|
|
}
|
|
|
|
if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
|
|
x, y := ebiten.CursorPosition()
|
|
for _, tf := range g.textFields {
|
|
if tf.Contains(x, y) {
|
|
tf.Focus()
|
|
tf.SetSelectionStartByCursorPosition(x, y)
|
|
} else {
|
|
tf.Blur()
|
|
}
|
|
}
|
|
}
|
|
|
|
for _, tf := range g.textFields {
|
|
tf.Update()
|
|
}
|
|
|
|
x, y := ebiten.CursorPosition()
|
|
var inTextField bool
|
|
for _, tf := range g.textFields {
|
|
if tf.Contains(x, y) {
|
|
inTextField = true
|
|
break
|
|
}
|
|
}
|
|
if inTextField {
|
|
ebiten.SetCursorShape(ebiten.CursorShapeText)
|
|
} else {
|
|
ebiten.SetCursorShape(ebiten.CursorShapeDefault)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (g *Game) Draw(screen *ebiten.Image) {
|
|
screen.Fill(color.RGBA{0xcc, 0xcc, 0xcc, 0xff})
|
|
for _, tf := range g.textFields {
|
|
tf.Draw(screen)
|
|
}
|
|
}
|
|
|
|
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
|
|
return screenWidth, screenHeight
|
|
}
|
|
|
|
func main() {
|
|
ebiten.SetWindowSize(screenWidth, screenHeight)
|
|
ebiten.SetWindowTitle("Text Input (Ebitengine Demo)")
|
|
if err := ebiten.RunGame(&Game{}); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|