Add scrolling canvas.

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

@@ -66,6 +66,12 @@ class CanvasView extends View implements PartGrid {
     private Tuple4<Integer, Integer, Integer, Integer> _dropToRemoveZone = new Tuple4<>(0, 0, 0, 0);
     private boolean _devMode = false;
 
+    @NonNull
+    private Tuple2<Integer, Integer> _viewOrigin = new Tuple2<>(0, 0);
+
+    @Nullable
+    private Tuple2<Integer, Integer> _mouseDownPoint = null;
+
     public CanvasView(Context context) {
         super(context);
         init();
@@ -182,16 +188,18 @@ class CanvasView extends View implements PartGrid {
     @Override
     public void onDraw(Canvas canvas){
         final long renderStartTime = System.currentTimeMillis();
-        drawBackground(canvas);
+        ScrolledCanvas scrolledCanvas = new ScrolledCanvas(canvas, _viewOrigin);
+
+        drawBackground(scrolledCanvas);
 
         for (Part part : parts){
-            part.draw(canvas, _devMode);
+            part.draw(scrolledCanvas, _devMode);
         }
 
         Log.d("Render time", System.currentTimeMillis() - renderStartTime + "ms");
     }
 
-    private void drawBackground(Canvas canvas) {
+    private void drawBackground(ScrolledCanvas canvas) {
         if (!_devMode){
             return;
         }
@@ -217,14 +225,19 @@ class CanvasView extends View implements PartGrid {
 
     @Override
     public boolean onTouchEvent(MotionEvent event){
-        final int x = (int) event.getX() - this.getLeft();
+        final int xInScreen = (int) event.getX() - this.getLeft();
-        final int y = (int) event.getY() - this.getTop();
+        final int yInScreen = (int) event.getY() - this.getTop();
+
+        final int xInCanvas = xInScreen + _viewOrigin.item1;
+        final int yInCanvas = yInScreen + _viewOrigin.item2;
 
         switch (event.getAction()){
             case MotionEvent.ACTION_DOWN:
             {
-                selectedPart = getPartOn(x, y);
+                _mouseDownPoint = new Tuple2<>(xInScreen, yInScreen);
-                lastTouchedPosition.to(x, y);
+
+                selectedPart = getPartOn(xInCanvas, yInCanvas);
+                lastTouchedPosition.to(xInScreen, yInScreen);
                 lastTouchedTime = System.currentTimeMillis();
                 if (selectedPart == null) {
                     Log.d("Touched part", "not found");
@@ -249,9 +262,9 @@ class CanvasView extends View implements PartGrid {
                 }
                 else if (motionMode == MotionMode.Type.LongTouch) {
                     if (selectedPart != null) {
-                        selectedPart.getMoveable().drop(x, y);
+                        selectedPart.getMoveable().drop(xInCanvas, yInCanvas);
 
-                        if (inDropZone(x, y)) {
+                        if (inDropZone(xInScreen, yInScreen)) {
                             Log.d("Canvas", "Deleting element" + selectedPart);
                             parts.remove(selectedPart);
                             selectedPart.unlink();
@@ -273,25 +286,38 @@ class CanvasView extends View implements PartGrid {
 
             case MotionEvent.ACTION_MOVE:
             {
+                if (selectedPart == null){
+                    int xMovement = _mouseDownPoint.item1 - xInScreen;
+                    int yMovement = _mouseDownPoint.item2 - yInScreen;
+
+                    _viewOrigin = new Tuple2(
+                            Math.max(_viewOrigin.item1 + xMovement, 0),
+                            Math.max(_viewOrigin.item2 + yMovement, 0));
+                    _mouseDownPoint = new Tuple2(xInScreen, yInScreen);
+                }
+                else {
                     if (!_devMode) {
                         break;
                     }
 
-                Log.i("Canvas", "X: " + x + " Y: " + y
+                    Log.i("Canvas", "X: " + xInScreen + " Y: " + yInScreen
-                        + " in drop zone " + _dropToRemoveZone + " : " + inDropZone(x, y));
+                            + " in drop zone " + _dropToRemoveZone + " : "
+                            + inDropZone(xInScreen, yInScreen));
+
                     if (motionMode == null) {
-                    final Selectable nowSelectedPart = getPartOn(x, y);
+                        final Selectable nowSelectedPart = getPartOn(xInCanvas, yInCanvas);
                         final boolean canWait = selectedPart == nowSelectedPart;
                         motionMode = getMotionMode(canWait);
                     }
                     if (motionMode == MotionMode.Type.LongTouch) {
                         if (selectedPart != null) {
                             _isDragging = true;
-                        selectedPart.getMoveable().moveEnd(x, y);
+                            selectedPart.getMoveable().moveEnd(xInCanvas, yInCanvas);
                             invalidate();
                         }
                     }
                 }
+            }
             break;
 
             default:

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

@@ -0,0 +1,44 @@
+package com.codigoparallevar.minicards;
+
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Path;
+import android.graphics.Rect;
+import android.support.annotation.NonNull;
+
+import com.codigoparallevar.minicards.types.Tuple2;
+
+public class ScrolledCanvas {
+    private final Canvas canvas;
+    private final int xOrig;
+    private final int yOrig;
+
+    public ScrolledCanvas(Canvas canvas, Tuple2<Integer, Integer> viewOrigin) {
+        this.canvas = canvas;
+        this.xOrig = viewOrigin.item1;
+        this.yOrig = viewOrigin.item2;
+    }
+
+    public void drawLine(float startX, float startY, float stopX, float stopY,
+                         @NonNull Paint paint) {
+        canvas.drawLine(startX - xOrig, startY - yOrig,
+                stopX - xOrig, stopY - yOrig, paint);
+    }
+
+    public void drawRect(@NonNull Rect r, @NonNull Paint paint) {
+        canvas.drawRect(r.left - xOrig, r.top - yOrig,
+                r.right - xOrig, r.bottom - yOrig,
+                paint);
+    }
+
+    public void drawCircle(float cx, float cy, float radius, @NonNull Paint paint) {
+        canvas.drawCircle(cx - xOrig, cy - yOrig,
+                radius, paint);
+    }
+
+    public void drawPath(@NonNull Path path, @NonNull Paint paint) {
+        Path offsetPath = new Path(path);
+        offsetPath.offset(-xOrig, -yOrig);
+        canvas.drawPath(offsetPath, paint);
+    }
+}

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

@@ -5,6 +5,7 @@ import android.graphics.Color;
 import android.graphics.Paint;
 import android.util.Log;
 
+import com.codigoparallevar.minicards.ScrolledCanvas;
 import com.codigoparallevar.minicards.types.PartConnection;
 import com.codigoparallevar.minicards.types.Tuple2;
 import com.codigoparallevar.minicards.types.connectors.input.InputConnector;
@@ -85,7 +86,7 @@ public class RoundButton implements Part {
     }
 
     @Override
-    public void draw(Canvas canvas, boolean devMode) {
+    public void draw(ScrolledCanvas canvas, boolean devMode) {
         Paint foregroundPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
         foregroundPaint.setColor(Color.WHITE);
 
@@ -102,7 +103,7 @@ public class RoundButton implements Part {
         canvas.drawCircle(_xCenter, _yCenter, _innerRadius, foregroundPaint);
     }
 
-    private void drawConnector(Canvas canvas) {
+    private void drawConnector(ScrolledCanvas canvas) {
         Paint connectorPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
         connectorPaint.setColor(Color.RED);
 
@@ -123,7 +124,7 @@ public class RoundButton implements Part {
         return _innerRadius;
     }
 
-    private void drawWires(Canvas canvas, boolean devMode) {
+    private void drawWires(ScrolledCanvas canvas, boolean devMode) {
         for (OutputConnector outputConnector : _outputConnectors){
             outputConnector.drawWires(canvas, devMode);
         }

app/src/main/java/com/codigoparallevar/minicards/parts/samples/ColorBox.java

@@ -6,7 +6,7 @@ import android.graphics.Paint;
 import android.graphics.Rect;
 import android.util.Log;
 
-import com.codigoparallevar.minicards.types.Wire;
+import com.codigoparallevar.minicards.ScrolledCanvas;
 import com.codigoparallevar.minicards.types.connectors.input.InputConnector;
 import com.codigoparallevar.minicards.types.Moveable;
 import com.codigoparallevar.minicards.types.connectors.input.SignalInputConnector;
@@ -79,7 +79,7 @@ public class ColorBox implements Part {
     }
 
     @Override
-    public void draw(Canvas canvas, boolean devMode) {
+    public void draw(ScrolledCanvas canvas, boolean devMode) {
         Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
         if (_activated){
             paint.setColor(Color.GREEN);
@@ -100,7 +100,7 @@ public class ColorBox implements Part {
                 paint);
     }
 
-    private void drawConnector(Canvas canvas) {
+    private void drawConnector(ScrolledCanvas canvas) {
         Paint connectorPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
         connectorPaint.setColor(Color.YELLOW);
 

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

@@ -1,10 +1,10 @@
 package com.codigoparallevar.minicards.parts.samples;
 
-import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
 import android.util.Log;
 
+import com.codigoparallevar.minicards.ScrolledCanvas;
 import com.codigoparallevar.minicards.types.connectors.input.InputConnector;
 import com.codigoparallevar.minicards.types.Moveable;
 import com.codigoparallevar.minicards.types.connectors.input.SignalInputConnector;
@@ -62,7 +62,7 @@ public class Placeholder implements Part {
     }
 
     @Override
-    public void draw(Canvas canvas, boolean devMode) {
+    public void draw(ScrolledCanvas canvas, boolean devMode) {
         Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
         paint.setColor(Color.WHITE);
 

app/src/main/java/com/codigoparallevar/minicards/types/Drawable.java

@@ -1,7 +1,7 @@
 package com.codigoparallevar.minicards.types;
 
-import android.graphics.Canvas;
+import com.codigoparallevar.minicards.ScrolledCanvas;
 
 public interface Drawable {
-    void draw(Canvas canvas, boolean devMode);
+    void draw(ScrolledCanvas canvas, boolean devMode);
 }

app/src/main/java/com/codigoparallevar/minicards/types/RoundOutputConnector.java

@@ -1,13 +1,11 @@
 package com.codigoparallevar.minicards.types;
 
-import android.graphics.Canvas;
 import android.util.Log;
 
+import com.codigoparallevar.minicards.ScrolledCanvas;
 import com.codigoparallevar.minicards.types.connectors.input.InputConnector;
 import com.codigoparallevar.minicards.types.connectors.input.SignalInputConnector;
-import com.codigoparallevar.minicards.types.connectors.output.OutputConnector;
 import com.codigoparallevar.minicards.types.connectors.output.SignalOutputConnector;
-import com.codigoparallevar.minicards.types.wireData.Signal;
 
 import java.util.HashSet;
 import java.util.LinkedList;
@@ -94,7 +92,7 @@ public class RoundOutputConnector implements Drawable, SignalOutputConnector {
     }
 
     @Override
-    public void drawWires(Canvas canvas, boolean devMode) {
+    public void drawWires(ScrolledCanvas canvas, boolean devMode) {
         for (SignalWire wire : _wires) {
             wire.draw(canvas, devMode);
         }
@@ -141,7 +139,7 @@ public class RoundOutputConnector implements Drawable, SignalOutputConnector {
     }
 
     @Override
-    public void draw(Canvas canvas, boolean devMode) {
+    public void draw(ScrolledCanvas canvas, boolean devMode) {
         // TODO: Complete this part
     }
 

app/src/main/java/com/codigoparallevar/minicards/types/Wire.java

@@ -1,10 +1,10 @@
 package com.codigoparallevar.minicards.types;
 
-import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Path;
 
+import com.codigoparallevar.minicards.ScrolledCanvas;
 import com.codigoparallevar.minicards.types.connectors.input.InputConnector;
 import com.codigoparallevar.minicards.types.wireData.WireDataType;
 
@@ -45,7 +45,7 @@ public class Wire<T extends WireDataType, InputConnectorType extends InputConnec
     }
 
     @Override
-    public void draw(Canvas canvas, boolean devMode) {
+    public void draw(ScrolledCanvas canvas, boolean devMode) {
         final Path samplePath = new Path();
 
         samplePath.moveTo(_xinit, _yinit);

app/src/main/java/com/codigoparallevar/minicards/types/connectors/output/OutputConnector.java

@@ -1,7 +1,6 @@
 package com.codigoparallevar.minicards.types.connectors.output;
 
-import android.graphics.Canvas;
+import com.codigoparallevar.minicards.ScrolledCanvas;
-
 import com.codigoparallevar.minicards.types.Dropper;
 import com.codigoparallevar.minicards.types.Selectable;
 import com.codigoparallevar.minicards.types.Tuple2;
@@ -16,7 +15,7 @@ public interface OutputConnector<T extends WireDataType,
         T2 extends Wire<T, T1>>
         extends Selectable, Dropper<T2> {
 
-    void drawWires(Canvas canvas, boolean devMode);
+    void drawWires(ScrolledCanvas canvas, boolean devMode);
     void updatePosition(int x, int y);
 
     List<Tuple2<String, String>> getConnectionEndpoints();