Differenciate touching and grabbing.

app/src/main/java/com/codigoparallevar/minicards/PartCanvasView.java

@@ -10,9 +10,11 @@ import android.util.Log;
 import android.view.MotionEvent;
 import android.view.View;
 
+import com.codigoparallevar.minicards.motion.MotionMode;
 import com.codigoparallevar.minicards.parts.Part;
 import com.codigoparallevar.minicards.parts.Placeholder;
 import com.codigoparallevar.minicards.parts.buttons.RoundButton;
+import com.codigoparallevar.minicards.parts.types.Position;
 
 import java.util.ArrayList;
 
@@ -24,6 +26,17 @@ class PartCanvasView extends View {
     @Nullable
     Part selectedPart;
 
+    @Nullable
+    final Position lastTouchedPosition = new Position();
+
+    @Nullable
+    long lastTouchedTime;
+
+    @Nullable
+    private MotionMode.Type motionMode;
+
+    private final static float touchTimeForLongTouchInMillis = 500;
+
     public PartCanvasView(Context context) {
         super(context);
         this.setBackgroundColor(Color.rgb(4, 69, 99));
@@ -72,6 +85,8 @@ class PartCanvasView extends View {
             case MotionEvent.ACTION_DOWN:
             {
                 selectedPart = getPartOn(x, y);
+                lastTouchedPosition.to(x, y);
+                lastTouchedTime = System.currentTimeMillis();
                 if (selectedPart == null) {
                     Log.d("Touched part", "not found");
                     return false;
@@ -83,14 +98,31 @@ class PartCanvasView extends View {
 
             case MotionEvent.ACTION_UP:
             {
+                if (motionMode == null){
+                    motionMode = getMotionMode(false);
+                }
+                if (motionMode != MotionMode.Type.LongTouch) {
+                    if (selectedPart != null){
+                        selectedPart.touched();
+                    }
+                }
+
+                motionMode = null;
                 selectedPart = null;
             }
             break;
 
             case MotionEvent.ACTION_MOVE:
             {
-                if (selectedPart != null){
-                    selectedPart.move(x, y);
+                if (motionMode == null){
+                    final Part nowSelectedPart = getPartOn(x, y);
+                    final boolean canWait = selectedPart == nowSelectedPart;
+                    motionMode = getMotionMode(canWait);
+                }
+                if (motionMode == MotionMode.Type.LongTouch){
+                    if (selectedPart != null){
+                        selectedPart.move(x, y);
+                    }
                 }
             }
             break;
@@ -105,6 +137,23 @@ class PartCanvasView extends View {
         return true;
     }
 
+    @Nullable
+    private MotionMode.Type getMotionMode(boolean canWait) {
+        if (selectedPart == null){
+            return MotionMode.Type.Displacement;
+        }
+
+        if ((System.currentTimeMillis() - lastTouchedTime) >= touchTimeForLongTouchInMillis){
+            return MotionMode.Type.LongTouch;
+        }
+
+        if (canWait) {
+            return null;
+        }
+
+        return MotionMode.Type.ShortTouch;
+    }
+
     @Nullable
     private Part getPartOn(int x, int y) {
         // Look in the list, in reverse so top-most elements are checked before

app/src/main/java/com/codigoparallevar/minicards/motion/MotionMode.java

@@ -0,0 +1,9 @@
+package com.codigoparallevar.minicards.motion;
+
+public class MotionMode {
+    public enum Type {
+        LongTouch,
+        ShortTouch,
+        Displacement,
+    }
+}

app/src/main/java/com/codigoparallevar/minicards/parts/Part.java

@@ -11,4 +11,6 @@ public interface Part {
     void draw(Canvas canvas);
 
     void move(int x, int y);
+
+    void touched();
 }

app/src/main/java/com/codigoparallevar/minicards/parts/Placeholder.java

@@ -3,6 +3,7 @@ package com.codigoparallevar.minicards.parts;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
+import android.util.Log;
 
 public class Placeholder implements Part {
     private int _left;
@@ -67,4 +68,9 @@ public class Placeholder implements Part {
         _top = y - height / 2;
         _bottom = _top + height;
     }
+
+    @Override
+    public void touched() {
+        Log.d("Placeholder", "Placeholder touched");
+    }
 }

app/src/main/java/com/codigoparallevar/minicards/parts/buttons/RoundButton.java

@@ -3,6 +3,7 @@ package com.codigoparallevar.minicards.parts.buttons;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
+import android.util.Log;
 
 import com.codigoparallevar.minicards.parts.Part;
 
@@ -60,4 +61,9 @@ public class RoundButton implements Part {
         _xCenter = x;
         _yCenter = y;
     }
+
+    @Override
+    public void touched() {
+        Log.d("RoundButton", "Round button touched");
+    }
 }

app/src/main/java/com/codigoparallevar/minicards/parts/types/Position.java

@@ -0,0 +1,19 @@
+package com.codigoparallevar.minicards.parts.types;
+
+public class Position {
+    private int _x;
+    private int _y;
+
+    public void to(int x, int y) {
+        _x = x;
+        _y = y;
+    }
+
+    public int get_x() {
+        return _x;
+    }
+
+    public int get_y() {
+        return _y;
+    }
+}