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tomo-old/elements/fun/piano.go

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package fun
import "image"
import "git.tebibyte.media/sashakoshka/tomo/input"
import "git.tebibyte.media/sashakoshka/tomo/theme"
import "git.tebibyte.media/sashakoshka/tomo/config"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/elements/core"
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import "git.tebibyte.media/sashakoshka/tomo/elements/fun/music"
const pianoKeyWidth = 18
type pianoKey struct {
image.Rectangle
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music.Note
}
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// Piano is an element that can be used to input midi notes.
type Piano struct {
*core.Core
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*core.FocusableCore
core core.CoreControl
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focusableControl core.FocusableCoreControl
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low, high music.Octave
config config.Wrapped
theme theme.Wrapped
flatKeys []pianoKey
sharpKeys []pianoKey
pressed *pianoKey
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keynavPressed map[music.Note] bool
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onPress func (music.Note)
onRelease func (music.Note)
}
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// NewPiano returns a new piano element with a lowest and highest octave,
// inclusive. If low is greater than high, they will be swapped.
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func NewPiano (low, high music.Octave) (element *Piano) {
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if low > high {
temp := low
low = high
high = temp
}
element = &Piano {
low: low,
high: high,
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keynavPressed: make(map[music.Note] bool),
}
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element.theme.Case = theme.C("fun", "piano")
element.Core, element.core = core.NewCore (func () {
element.recalculate()
element.draw()
})
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element.FocusableCore,
element.focusableControl = core.NewFocusableCore(element.redo)
element.updateMinimumSize()
return
}
// OnPress sets a function to be called when a key is pressed.
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func (element *Piano) OnPress (callback func (note music.Note)) {
element.onPress = callback
}
// OnRelease sets a function to be called when a key is released.
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func (element *Piano) OnRelease (callback func (note music.Note)) {
element.onRelease = callback
}
func (element *Piano) HandleMouseDown (x, y int, button input.Button) {
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element.Focus()
if button != input.ButtonLeft { return }
element.pressUnderMouseCursor(image.Pt(x, y))
}
func (element *Piano) HandleMouseUp (x, y int, button input.Button) {
if button != input.ButtonLeft { return }
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if element.onRelease != nil && element.pressed != nil {
element.onRelease((*element.pressed).Note)
}
element.pressed = nil
element.redo()
}
func (element *Piano) HandleMouseMove (x, y int) {
if element.pressed == nil { return }
element.pressUnderMouseCursor(image.Pt(x, y))
}
func (element *Piano) HandleMouseScroll (x, y int, deltaX, deltaY float64) { }
func (element *Piano) pressUnderMouseCursor (point image.Point) {
// find out which note is being pressed
newKey := (*pianoKey)(nil)
for index, key := range element.flatKeys {
if point.In(key.Rectangle) {
newKey = &element.flatKeys[index]
break
}
}
for index, key := range element.sharpKeys {
if point.In(key.Rectangle) {
newKey = &element.sharpKeys[index]
break
}
}
if newKey == nil { return }
if newKey != element.pressed {
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// release previous note
if element.pressed != nil && element.onRelease != nil {
element.onRelease((*element.pressed).Note)
}
// press new note
element.pressed = newKey
if element.onPress != nil {
element.onPress((*element.pressed).Note)
}
element.redo()
}
}
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var noteForKey = map[input.Key] music.Note {
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'a': 46,
'z': 47,
'x': 48,
'd': 49,
'c': 50,
'f': 51,
'v': 52,
'b': 53,
'h': 54,
'n': 55,
'j': 56,
'm': 57,
'k': 58,
',': 59,
'.': 60,
';': 61,
'/': 62,
'\'': 63,
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'1': 56,
'q': 57,
'2': 58,
'w': 59,
'e': 60,
'4': 61,
'r': 62,
'5': 63,
't': 64,
'y': 65,
'7': 66,
'u': 67,
'8': 68,
'i': 69,
'9': 70,
'o': 71,
'p': 72,
'-': 73,
'[': 74,
'=': 75,
']': 76,
'\\': 77,
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}
func (element *Piano) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
if !element.Enabled() { return }
note, exists := noteForKey[key]
if !exists { return }
if !element.keynavPressed[note] {
element.keynavPressed[note] = true
if element.onPress != nil {
element.onPress(note)
}
element.redo()
}
}
func (element *Piano) HandleKeyUp (key input.Key, modifiers input.Modifiers) {
note, exists := noteForKey[key]
if !exists { return }
_, pressed := element.keynavPressed[note]
if !pressed { return }
delete(element.keynavPressed, note)
if element.onRelease != nil {
element.onRelease(note)
}
element.redo()
}
// SetTheme sets the element's theme.
func (element *Piano) SetTheme (new theme.Theme) {
if new == element.theme.Theme { return }
element.theme.Theme = new
element.updateMinimumSize()
element.recalculate()
element.redo()
}
// SetConfig sets the element's configuration.
func (element *Piano) SetConfig (new config.Config) {
if new == element.config.Config { return }
element.config.Config = new
element.updateMinimumSize()
element.recalculate()
element.redo()
}
func (element *Piano) updateMinimumSize () {
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inset := element.theme.Inset(theme.PatternSunken)
element.core.SetMinimumSize (
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pianoKeyWidth * 7 * element.countOctaves() + inset[1] + inset[3],
64 + inset[0] + inset[2])
}
func (element *Piano) countOctaves () int {
return int(element.high - element.low + 1)
}
func (element *Piano) countFlats () int {
return element.countOctaves() * 8
}
func (element *Piano) countSharps () int {
return element.countOctaves() * 5
}
func (element *Piano) redo () {
if element.core.HasImage() {
element.draw()
element.core.DamageAll()
}
}
func (element *Piano) recalculate () {
element.flatKeys = make([]pianoKey, element.countFlats())
element.sharpKeys = make([]pianoKey, element.countSharps())
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inset := element.theme.Inset(theme.PatternPinboard)
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bounds := inset.Apply(element.Bounds())
dot := bounds.Min
note := element.low.Note(0)
limit := element.high.Note(12)
flatIndex := 0
sharpIndex := 0
for note < limit {
if note.IsSharp() {
element.sharpKeys[sharpIndex].Rectangle = image.Rect (
-(pianoKeyWidth * 3) / 7, 0,
(pianoKeyWidth * 3) / 7,
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(bounds.Dy() * 5) / 8).Add(dot)
element.sharpKeys[sharpIndex].Note = note
sharpIndex ++
} else {
element.flatKeys[flatIndex].Rectangle = image.Rect (
0, 0, pianoKeyWidth, bounds.Dy()).Add(dot)
dot.X += pianoKeyWidth
element.flatKeys[flatIndex].Note = note
flatIndex ++
}
note ++
}
}
func (element *Piano) draw () {
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state := theme.PatternState {
Focused: element.Focused(),
Disabled: !element.Enabled(),
}
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pattern := element.theme.Pattern(theme.PatternPinboard, state)
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// inset := element.theme.Inset(theme.PatternSunken)
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artist.FillRectangle(element.core, pattern, element.Bounds())
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for _, key := range element.flatKeys {
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_, keynavPressed := element.keynavPressed[key.Note]
element.drawFlat (
key.Rectangle,
element.pressed != nil &&
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(*element.pressed).Note == key.Note || keynavPressed,
state)
}
for _, key := range element.sharpKeys {
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_, keynavPressed := element.keynavPressed[key.Note]
element.drawSharp (
key.Rectangle,
element.pressed != nil &&
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(*element.pressed).Note == key.Note || keynavPressed,
state)
}
}
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func (element *Piano) drawFlat (
bounds image.Rectangle,
pressed bool,
state theme.PatternState,
) {
state.Pressed = pressed
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pattern := element.theme.Theme.Pattern (
theme.PatternButton, state, theme.C("fun", "flatKey"))
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artist.FillRectangle(element.core, pattern, bounds)
}
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func (element *Piano) drawSharp (
bounds image.Rectangle,
pressed bool,
state theme.PatternState,
) {
state.Pressed = pressed
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pattern := element.theme.Theme.Pattern (
theme.PatternButton, state, theme.C("fun", "sharpKey"))
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artist.FillRectangle(element.core, pattern, bounds)
}