409 lines
8.3 KiB
Go
409 lines
8.3 KiB
Go
package kibodo
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import (
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"image"
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"image/color"
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"log"
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"time"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2/examples/resources/fonts"
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"github.com/hajimehoshi/ebiten/v2/inpututil"
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"github.com/hajimehoshi/ebiten/v2/text"
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"golang.org/x/image/font"
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"golang.org/x/image/font/opentype"
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)
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// Keyboard is an on-screen keyboard widget.
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type Keyboard struct {
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x, y int
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w, h int
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visible bool
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alpha float64
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passPhysical bool
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allowUserHide bool
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internalBuffer []rune
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inputBuffer chan *Input
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keys [][]*Key
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background *ebiten.Image
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backgroundDirty bool
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op *ebiten.DrawImageOptions
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backgroundColor color.Color
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lastBackgroundColor color.Color
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shift bool
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touchIDs []ebiten.TouchID
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hideShortcuts []ebiten.Key
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labelFont font.Face
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}
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// NewKeyboard returns a new Keyboard.
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func NewKeyboard() *Keyboard {
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fontFace, err := defaultFontFace(64)
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if err != nil {
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log.Fatal(err)
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}
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k := &Keyboard{
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alpha: 1.0,
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op: &ebiten.DrawImageOptions{
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Filter: ebiten.FilterNearest,
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},
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background: ebiten.NewImage(1, 1),
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backgroundColor: color.Black,
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labelFont: fontFace,
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}
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return k
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}
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func defaultFont() (*opentype.Font, error) {
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return opentype.Parse(fonts.MPlus1pRegular_ttf)
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}
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func defaultFontFace(size float64) (font.Face, error) {
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f, err := defaultFont()
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if err != nil {
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return nil, err
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}
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const dpi = 72 // TODO
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return opentype.NewFace(f, &opentype.FaceOptions{
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Size: size,
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DPI: dpi,
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Hinting: font.HintingFull,
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})
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}
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// SetRect sets the position and size of the widget.
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func (k *Keyboard) SetRect(x, y, w, h int) {
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if k.x == x && k.y == y && k.w == w && k.h == h {
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return
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}
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k.x, k.y, k.w, k.h = x, y, w, h
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k.updateKeyRects()
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k.backgroundDirty = true
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}
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func (k *Keyboard) GetKeys() [][]*Key {
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return k.keys
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}
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func (k *Keyboard) SetKeys(keys [][]*Key) {
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k.keys = keys
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k.updateKeyRects()
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k.backgroundDirty = true
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}
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func (k *Keyboard) SetLabelFont(face font.Face) {
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k.labelFont = face
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k.backgroundDirty = true
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}
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func (k *Keyboard) SetHideShortcuts(shortcuts []ebiten.Key) {
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k.hideShortcuts = shortcuts
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}
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func (k *Keyboard) updateKeyRects() {
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if len(k.keys) == 0 {
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return
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}
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maxCells := 0
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for _, rowKeys := range k.keys {
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if len(rowKeys) > maxCells {
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maxCells = len(rowKeys)
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}
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}
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cellPaddingW := 7
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cellPaddingH := 7
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cellH := (k.h - (cellPaddingH * (len(k.keys) - 1))) / len(k.keys)
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row := 0
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for _, rowKeys := range k.keys {
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if len(rowKeys) == 0 {
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continue
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}
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cellW := (k.w - (cellPaddingW * (len(rowKeys) - 1))) / len(rowKeys)
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for i, key := range rowKeys {
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key.x = (cellW + cellPaddingW) * i
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key.y = (cellH + cellPaddingH) * row
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key.w = cellW
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key.h = cellH
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if i == len(rowKeys)-1 {
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key.w = k.w - key.x
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}
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}
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// Count non-empty rows only
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row++
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}
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}
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func (k *Keyboard) at(x, y int) *Key {
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if !k.visible {
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return nil
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}
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if x >= k.x && x <= k.x+k.w && y >= k.y && y <= k.y+k.h {
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x, y = x-k.x, y-k.y // Offset
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for _, rowKeys := range k.keys {
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for _, key := range rowKeys {
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if x >= key.x && x <= key.x+key.w && y >= key.y && y <= key.y+key.h {
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return key
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}
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}
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}
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}
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return nil
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}
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func (k *Keyboard) handleHideKey(inputKey ebiten.Key) bool {
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if !k.allowUserHide {
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return false
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}
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for _, key := range k.hideShortcuts {
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if key == inputKey {
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k.Hide()
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return true
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}
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}
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return false
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}
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func (k *Keyboard) Hit(key *Key) {
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input := key.LowerInput
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if k.shift {
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input = key.UpperInput
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}
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if input.Key == ebiten.KeyShift {
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k.shift = !k.shift
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k.backgroundDirty = true
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return
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} else if k.handleHideKey(input.Key) {
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// Hidden
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return
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}
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k.inputBuffer <- input
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}
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// Update handles user input.
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func (k *Keyboard) Update() error {
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if !k.visible {
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return nil
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}
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// Pass through physical keyboard input
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if k.passPhysical {
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// Read input characters
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k.internalBuffer = ebiten.AppendInputChars(k.internalBuffer[:0])
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if len(k.internalBuffer) > 0 {
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for _, r := range k.internalBuffer {
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k.inputBuffer <- &Input{Rune: r} // Pass through
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}
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} else {
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// Read keys
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for _, key := range allKeys {
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if inpututil.IsKeyJustPressed(key) {
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if k.handleHideKey(key) {
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// Hidden
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return nil
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}
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k.inputBuffer <- &Input{Key: key} // Pass through
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}
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}
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}
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}
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// Handle mouse input
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if inpututil.IsMouseButtonJustReleased(ebiten.MouseButtonLeft) {
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x, y := ebiten.CursorPosition()
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key := k.at(x, y)
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if key != nil {
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for _, rowKeys := range k.keys {
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for _, rowKey := range rowKeys {
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rowKey.pressed = false
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}
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}
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key.pressed = true
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k.Hit(key)
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// TODO replace with pressUntil
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go func() {
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time.Sleep(50 * time.Millisecond)
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key.pressed = false
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ebiten.ScheduleFrame()
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}()
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}
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} else if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
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x, y := ebiten.CursorPosition()
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key := k.at(x, y)
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if key != nil {
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key.pressed = true
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}
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}
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// Handle touch input
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k.touchIDs = inpututil.AppendJustPressedTouchIDs(k.touchIDs[:0])
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for _, id := range k.touchIDs {
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x, y := ebiten.TouchPosition(id)
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key := k.at(x, y)
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if key != nil {
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key.pressed = true
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k.Hit(key)
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// TODO replace with pressUntil
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go func() {
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time.Sleep(50 * time.Millisecond)
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key.pressed = false
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ebiten.ScheduleFrame()
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}()
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}
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}
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return nil
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}
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func (k *Keyboard) offset(x, y int) (int, int) {
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return x + k.x, y + k.y
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}
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func (k *Keyboard) drawBackground() {
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if k.w == 0 || k.h == 0 {
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return
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}
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if k.background == nil || k.background.Bounds() != image.Rect(0, 0, k.w, k.h) || k.backgroundColor != k.lastBackgroundColor {
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k.background = ebiten.NewImageFromImage(image.NewRGBA(image.Rect(0, 0, k.w, k.h)))
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k.background.Fill(k.backgroundColor)
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k.lastBackgroundColor = k.backgroundColor
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}
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for _, rowKeys := range k.keys {
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for _, key := range rowKeys {
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label := key.LowerLabel
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if k.shift {
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label = key.UpperLabel
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}
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// Draw key background
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img := ebiten.NewImageFromImage(image.NewRGBA(image.Rect(0, 0, key.w, key.h)))
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img.Fill(color.RGBA{100, 100, 100, 255})
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// Draw key label
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bounds := text.BoundString(k.labelFont, label)
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x := (key.w - bounds.Dx()) / 2
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if x < 0 {
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x = 0
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}
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y := key.h / 2
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text.Draw(img, label, k.labelFont, x, y, color.White)
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// Draw key
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k.op.GeoM.Reset()
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k.op.GeoM.Translate(float64(key.x), float64(key.y))
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k.background.DrawImage(img, k.op)
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k.op.ColorM.Reset()
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}
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}
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}
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// Draw draws the widget on the provided image.
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func (k *Keyboard) Draw(target *ebiten.Image) {
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if !k.visible {
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return
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}
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if k.backgroundDirty {
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k.drawBackground()
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k.backgroundDirty = false
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}
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k.op.GeoM.Reset()
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k.op.GeoM.Translate(float64(k.x), float64(k.y))
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k.op.ColorM.Scale(1, 1, 1, k.alpha)
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target.DrawImage(k.background, k.op)
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k.op.ColorM.Reset()
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// Draw pressed keys
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for _, rowKeys := range k.keys {
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for _, key := range rowKeys {
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if !key.pressed {
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continue
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}
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// TODO buffer to prevent issues with alpha channel
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k.op.GeoM.Reset()
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k.op.GeoM.Translate(float64(k.x+key.x), float64(k.y+key.y))
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k.op.ColorM.Scale(0.75, 0.75, 0.75, k.alpha)
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target.DrawImage(k.background.SubImage(image.Rect(key.x, key.y, key.x+key.w, key.y+key.h)).(*ebiten.Image), k.op)
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k.op.ColorM.Reset()
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}
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}
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}
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// SetAllowUserHide sets a flag that controls whether the widget may be hidden
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// by the user. The input buffer channel is closed when the widget is hidden.
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func (k *Keyboard) SetAllowUserHide(allow bool) {
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k.allowUserHide = allow
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}
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// SetPassThroughPhysicalInput sets a flag that controls whether physical
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// keyboard input is passed through to the widget's input buffer. This is not
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// enabled by default.
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func (k *Keyboard) SetPassThroughPhysicalInput(pass bool) {
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k.passPhysical = pass
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}
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// SetAlpha sets the transparency level of the widget on a scale of 0 to 1.0.
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func (k *Keyboard) SetAlpha(alpha float64) {
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k.alpha = alpha
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}
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// Show shows the widget and begins sending input to the provided channel. The
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// channel is closed if the widget is hidden.
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func (k *Keyboard) Show(inputBuffer chan *Input) {
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if k.inputBuffer != nil {
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close(k.inputBuffer)
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}
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k.inputBuffer = inputBuffer
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k.visible = true
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}
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func (k *Keyboard) Visible() bool {
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return k.visible
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}
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// Hide hides the widget and closes the input buffer channel.
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func (k *Keyboard) Hide() {
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if k.inputBuffer != nil {
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close(k.inputBuffer)
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k.inputBuffer = nil
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}
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k.visible = false
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}
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