mobile: Handle touch events

examples/mobile/main_mobile.go

@@ -37,3 +37,17 @@ func Start() error {
 func Render() error {
 	return mobile.Render()
 }
+
+// TODO: So many glue codes: Can I reduce those?
+
+func TouchDown(x, y int) {
+	mobile.TouchDown(x, y)
+}
+
+func TouchUp(x, y int) {
+	mobile.TouchUp(x, y)
+}
+
+func TouchMove(x, y int) {
+	mobile.TouchMove(x, y)
+}

examples/mobile/mobile/update.go

@@ -15,10 +15,12 @@
 package mobile
 
 import (
+	"fmt"
 	"log"
 	"math"
 
 	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/ebitenutil"
 	"github.com/hajimehoshi/ebiten/examples/common"
 )
 
@@ -50,5 +52,11 @@ func Update(screen *ebiten.Image) error {
 	if err := screen.DrawImage(gophersImage, op); err != nil {
 		return err
 	}
+	msg := ""
+	if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
+		x, y := ebiten.CursorPosition()
+		msg = fmt.Sprintf("(%d, %d)", x, y)
+	}
+	ebitenutil.DebugPrint(screen, msg)
 	return nil
 }

internal/ui/input_glfw.go

@@ -18,8 +18,9 @@
 package ui
 
 import (
-	glfw "github.com/go-gl/glfw/v3.1/glfw"
 	"math"
+
+	glfw "github.com/go-gl/glfw/v3.1/glfw"
 )
 
 var glfwMouseButtonToMouseButton = map[glfw.MouseButton]MouseButton{

internal/ui/input_mobile.go

@@ -15,3 +15,23 @@
 // +build android
 
 package ui
+
+func (i *input) touchDown(x, y int) {
+	i.m.Lock()
+	defer i.m.Unlock()
+	i.mouseButtonPressed[MouseButtonLeft] = true
+	i.cursorX, i.cursorY = x, y
+}
+
+func (i *input) touchUp(x, y int) {
+	i.m.Lock()
+	defer i.m.Unlock()
+	i.mouseButtonPressed[MouseButtonLeft] = false
+	i.cursorX, i.cursorY = x, y
+}
+
+func (i *input) touchMove(x, y int) {
+	i.m.Lock()
+	defer i.m.Unlock()
+	i.cursorX, i.cursorY = x, y
+}

internal/ui/ui_mobile.go

@@ -130,3 +130,18 @@ func (u *userInterface) ScreenScale() int {
 func (u *userInterface) actualScreenScale() int {
 	return u.scale
 }
+
+func TouchDown(x, y int) {
+	s := currentUI.actualScreenScale()
+	currentInput.touchDown(x/s, y/s)
+}
+
+func TouchUp(x, y int) {
+	s := currentUI.actualScreenScale()
+	currentInput.touchUp(x/s, y/s)
+}
+
+func TouchMove(x, y int) {
+	s := currentUI.actualScreenScale()
+	currentInput.touchMove(x/s, y/s)
+}

mobile/run.go

@@ -50,3 +50,15 @@ func Render() error {
 	}
 	return ui.Render(chError)
 }
+
+func TouchDown(x, y int) {
+	ui.TouchDown(x, y)
+}
+
+func TouchUp(x, y int) {
+	ui.TouchUp(x, y)
+}
+
+func TouchMove(x, y int) {
+	ui.TouchMove(x, y)
+}