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text.go
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text.go
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package gui
import (
"github.com/gordonklaus/ftgl"
"github.com/gordonklaus/glfw"
gl "github.com/chsc/gogl/gl21"
"go/build"
"math"
"os"
"path/filepath"
"sync"
"time"
)
type Text struct {
*ViewBase
text string
font ftgl.Font
textColor Color
frameSize float64
frameColor Color
backgroundColor Color
Validate func(*string) bool
Accept, TextChanged func(string)
Reject func()
blinkCursor bool
cursor bool
stopCursor chan chan bool
}
func NewText(text string) *Text {
t := &Text{}
t.ViewBase = NewView(t)
t.font = getFont()
t.textColor = Color{1, 1, 1, 1}
t.backgroundColor = Color{0, 0, 0, 1}
t.stopCursor = make(chan chan bool)
t.SetText(text)
return t
}
var fontCache = struct {
sync.Mutex
m map[*glfw.Window]ftgl.Font
}{m: map[*glfw.Window]ftgl.Font{}}
// Must be called from a thread holding an OpenGL context, i.e., a window callback thread.
func getFont() ftgl.Font {
w := glfw.GetCurrentContext()
if w == nil {
panic("no current context")
}
fontCache.Lock()
defer fontCache.Unlock()
font := fontCache.m[w]
if font.Nil() {
font = ftgl.NewTextureFont(filepath.Join(pkgDir(), "Times New Roman.ttf"))
font.SetFaceSize(18, 1)
fontCache.m[w] = font
}
return font
}
func pkgDir() string {
for _, dir := range build.Default.SrcDirs() {
dir := filepath.Join(dir, "github.com/gordonklaus/gui")
if _, err := os.Stat(dir); err == nil {
return dir
}
}
panic("unreachable")
}
func (t Text) Text() string { return t.text }
func (t *Text) SetText(text string) {
t.text = text
t.Resize(math.Max(1, 2*t.frameSize+t.font.Advance(t.text)), 2*t.frameSize-t.font.Descender()+t.font.Ascender())
if t.TextChanged != nil {
t.TextChanged(text)
}
}
func (t *Text) SetTextColor(c Color) {
t.textColor = c
Repaint(t)
}
func (t *Text) SetBackgroundColor(c Color) {
t.backgroundColor = c
Repaint(t)
}
func (t *Text) SetFrameColor(c Color) {
t.frameColor = c
Repaint(t)
}
func (t *Text) SetFrameSize(size float64) {
t.frameSize = size
t.Resize(2*t.frameSize+t.font.Advance(t.text), 2*t.frameSize-t.font.Descender()+t.font.Ascender())
}
func (t *Text) TookKeyFocus() { t.ShowCursor() }
func (t *Text) LostKeyFocus() { t.HideCursor() }
func (t *Text) ShowCursor() {
if t.blinkCursor {
return
}
t.blinkCursor = true
t.cursor = true
Repaint(t)
go func() {
tick := time.NewTicker(time.Second / 2)
defer tick.Stop()
for {
select {
case <-tick.C:
select {
case DoChan(t) <- func() {
t.cursor = !t.cursor
Repaint(t)
}:
case ch := <-t.stopCursor:
ch <- true
return
}
case ch := <-t.stopCursor:
ch <- true
return
}
}
}()
}
func (t *Text) HideCursor() {
if !t.blinkCursor {
return
}
t.blinkCursor = false
ch := make(chan bool)
t.stopCursor <- ch
<-ch
t.cursor = false
Repaint(t)
}
func (t *Text) KeyPress(event KeyEvent) {
if len(event.Text) > 0 {
text := t.text + event.Text
if t.Validate == nil || t.Validate(&text) {
t.SetText(text)
}
}
switch event.Key {
case KeyBackspace:
if len(t.text) > 0 {
text := t.text[:len(t.text)-1]
if t.Validate == nil || t.Validate(&text) {
t.SetText(text)
}
}
case KeyEnter:
if t.Accept != nil {
t.Accept(t.text)
}
case KeyEscape:
if t.Reject != nil {
t.Reject()
}
}
}
func (t *Text) Paint() {
SetColor(t.backgroundColor)
FillRect(InnerRect(t).Inset(t.frameSize))
if t.frameSize > 0 {
SetColor(t.frameColor)
SetLineWidth(t.frameSize)
DrawRect(InnerRect(t))
}
if t.cursor {
SetColor(t.textColor)
SetLineWidth(2)
x := t.frameSize + t.font.Advance(t.text)
DrawLine(Pt(x, t.frameSize), Pt(x, Height(t)-2*t.frameSize))
}
SetColor(t.textColor)
gl.Translated(gl.Double(t.frameSize), gl.Double(t.frameSize-t.font.Descender()), 0)
t.font.Render(t.text)
}