Clear button will light up only when changes are made

Author: Anirudh S

helpstack/res/layout/hs_activity_edit_attachment.xml

@@ -22,11 +22,11 @@
         android:layout_marginBottom="4dp">
 
         <TextView
-            android:id="@+id/clear_TextView"
+            android:id="@+id/clear_change_text"
             android:layout_width="wrap_content"
             android:layout_height="match_parent"
             android:layout_marginLeft="8dp"
-            android:textColor="@android:color/white"
+            android:textColor="@color/hs_darkerGreycolor"
             android:text="@string/hs_clear"
             android:layout_gravity="center_horizontal"
             android:textSize="@dimen/hs_default_text_size" />

helpstack/res/values/hs_colors.xml

@@ -9,6 +9,7 @@
     <color name="hs_transparent_color">#0000</color>
     <color name="hs_lightGreycolor">#ECECEC</color>
     <color name="hs_darkGreycolor">#B5B5B5</color>
+    <color name="hs_darkerGreycolor">#ff555555</color>
 
     <color name="hs_rightchat_bubblecolor">#228CD1</color>
     <color name="hs_leftchat_bubblecolor">#FFFFFF</color>

helpstack/src/com/tenmiles/helpstack/activities/DrawingView.java

@@ -31,6 +31,8 @@ public class DrawingView extends View {
     private int resizedHeight;
     private boolean isEdited;
 
+    private ObserverInterface mObserver;
+
     public DrawingView(Context context, AttributeSet attrs) {
         super(context, attrs);
 
@@ -92,6 +94,7 @@ public boolean onTouchEvent(MotionEvent event) {
                 drawCanvas.drawPath(drawPath, drawPaint);
                 setIsEdited(true);
                 drawPath.reset();
+                activateClearOptionInActivity(true);
                 break;
             default:
                 return false;
@@ -112,6 +115,7 @@ public void clearChanges() {
         drawPath.reset();
         setCanvasBitmap(cachedBitmap);
         setIsEdited(false);
+        activateClearOptionInActivity(false);
         invalidate();
     }
 
@@ -138,4 +142,18 @@ private int getLeftStart(int resizedWidth) {
         int leftStart = (this.getLeft() + this.getRight() - resizedWidth) >> 1;
         return leftStart;
     }
+
+    public void setObserver(ObserverInterface observer){
+        mObserver = observer;
+    }
+
+    private void activateClearOptionInActivity(boolean isEdited){
+        if( mObserver != null ){
+            mObserver.activateClearOption(isEdited);
+        }
+    }
+
+    public interface ObserverInterface {
+        void activateClearOption(boolean isEdited);
+    }
 }

helpstack/src/com/tenmiles/helpstack/activities/EditAttachmentActivity.java

@@ -55,6 +55,8 @@ public class EditAttachmentActivity extends Activity {
     private HSAttachment selectedAttachment;
     private Bitmap originalBitmap;
 
+    private TextView clearChangesTextView;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -64,7 +66,14 @@ protected void onCreate(Bundle savedInstanceState) {
         getActionBar().setTitle(R.string.hs_attachment_edit);
 
         drawView = (DrawingView)findViewById(R.id.drawing);
-        TextView clearChanges = (TextView) findViewById(R.id.clear_TextView);
+        drawView.setObserver(new DrawingView.ObserverInterface() {
+            @Override
+            public void activateClearOption(boolean isEnabled) {
+                activityClearTextView(isEnabled);
+            }
+        });
+
+        TextView clearChanges = (TextView) findViewById(R.id.clear_change_text);
         clearChanges.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
@@ -74,6 +83,7 @@ public void onClick(View view) {
 
         currentPaint = (ImageButton) findViewById(R.id.hs_red_brush);
         currentPaint.setBackground(getResources().getDrawable(R.drawable.paint_pressed));
+        clearChangesTextView = (TextView)findViewById(R.id.clear_change_text);
 
         Intent intent = new Intent();
         intent.setType("image/*");
@@ -214,5 +224,12 @@ public void onClick(DialogInterface arg0, int arg1) {
     }
 
 
-
+    public void activityClearTextView(boolean isEnabled) {
+        if (isEnabled) {
+            clearChangesTextView.setTextColor(getResources().getColor(android.R.color.white));
+        }
+        else {
+            clearChangesTextView.setTextColor(getResources().getColor(R.color.hs_darkerGreycolor));
+        }
+    }
 }