95 lines
2.0 KiB
Go
95 lines
2.0 KiB
Go
package mouse
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import (
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"git.vezzani.net/ben/games/common/elements/v1"
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"git.vezzani.net/ben/games/common/geo"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2/inpututil"
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)
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type NopHandler struct{}
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func (n NopHandler) HandleMouseEvent(s State) bool {
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return false
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}
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type EventHandler interface {
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HandleMouseEvent(s State) bool
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}
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type State struct {
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X, Y int
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LeftDown, RightDown bool
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LeftChanged, RightChanged bool
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LeftClicked, RightClicked bool
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Clicked bool
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}
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func (s *State) Point() geo.Point {
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return geo.Point{
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X: s.X,
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Y: s.Y,
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}
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}
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func Handler(e elements.Element) func() bool {
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newState := StateBuilder()
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ms := newState()
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return func() bool {
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ms = newState()
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return propagateMouse(e, ms)
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}
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}
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func propagateMouse(e elements.Element, ms State) bool {
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for _, c := range e.Children() {
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if propagateMouse(c, ms) {
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return true
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}
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}
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if e, ok := e.(EventHandler); ok {
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return e.HandleMouseEvent(ms)
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}
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return false
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}
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func StateBuilder() func() State {
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prevState := State{}
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state := State{}
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return func() State {
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state = prevState
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state.X, state.Y = ebiten.CursorPosition()
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if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
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state.LeftDown = true
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}
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if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonRight) {
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state.RightDown = true
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}
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if inpututil.IsMouseButtonJustReleased(ebiten.MouseButtonLeft) {
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state.LeftDown = false
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if !state.RightDown {
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state.Clicked = true
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}
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}
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if inpututil.IsMouseButtonJustReleased(ebiten.MouseButtonRight) {
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state.RightDown = false
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if !state.LeftDown {
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state.Clicked = true
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}
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}
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state.Clicked = state.Clicked && !prevState.Clicked
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state.LeftChanged = state.LeftDown != prevState.LeftDown
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state.RightChanged = state.RightDown != prevState.RightDown
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state.LeftClicked = state.LeftChanged && state.LeftDown
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state.RightClicked = state.RightChanged && state.RightDown
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prevState = state
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return state
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}
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}
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