1 files changed, 22 insertions, 5 deletions
diff --git a/app/src/main/java/space/jakob/mines/GameActivity.kt b/app/src/main/java/space/jakob/mines/GameActivity.kt
index 929c020..927955e 100644
--- a/app/src/main/java/space/jakob/mines/GameActivity.kt
+++ b/app/src/main/java/space/jakob/mines/GameActivity.kt
@@ -13,26 +13,43 @@
 package space.jakob.mines
 
 import android.support.v7.app.AppCompatActivity
+import android.support.v4.view.GestureDetectorCompat
 import android.os.Bundle
+import android.view.GestureDetector
 import android.view.MotionEvent
 import android.util.Log
 
 class GameActivity : AppCompatActivity() {
     lateinit var gameView: GameView
+    lateinit var gestureDetector: GestureDetectorCompat
 
-    override fun onTouchEvent(event: MotionEvent): Boolean {
-        val (x, y) = gameView.toGridCoordinates(event.x.toInt(), event.y.toInt())
-        gameView.grid?.let {
-            it.reveal(x, y)
+    // Implements the callbacks for gestureDetector.
+    val gestureListener = object : GestureDetector.SimpleOnGestureListener() {
+        override fun onScroll(e1: MotionEvent, e2: MotionEvent, dx: Float, dy: Float): Boolean {
+            with (gameView) {
+                cameraX = (cameraX + dx / 100.0).coerceIn(0.0, gameView.maxCameraX)
+                cameraY = (cameraY + dy / 100.0).coerceIn(0.0, gameView.maxCameraY)
+            }
             gameView.invalidate()
+            return false
+        }
+    }
+
+    override fun onTouchEvent(event: MotionEvent): Boolean {
+        return if (gestureDetector.onTouchEvent(event)) {
+            true
+        } else {
+            super.onTouchEvent(event)
         }
-        return true
     }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_game)
+
         gameView = findViewById(R.id.view) as GameView
         gameView.grid = Grid(8, 8, 10)
+
+        gestureDetector = GestureDetectorCompat(this, gestureListener)
     }
 }