AndroidUI: implemented search in the bag of words

src/android/Fridge/default.properties

@@ -10,4 +10,4 @@
 # Indicates whether an apk should be generated for each density.
 split.density=false
 # Project target.
-target=android-2
+target=android-4

src/android/Fridge/res/layout/main.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+	android:id="@+id/main_view"
     android:orientation="vertical"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
@@ -7,9 +8,9 @@
     >
 	<se.fnord.android.layout.PredicateLayout
     	android:id="@+id/magnets_sentence"
-    	android:layout_width="fill_parent" 
-    	android:layout_height="wrap_content"
-    	android:padding="5dip"/>
+    	android:layout_width="wrap_content" 
+   		android:layout_height="wrap_content"
+   		android:padding="5dip"/>
 
 	<View 
 		android:layout_height="8dip"

src/android/Fridge/src/org/grammaticalframework/fridge/FridgeMagnets.java

@@ -4,8 +4,10 @@ import java.util.Arrays;
 
 import android.os.*;
 import android.app.*;
-import android.content.Context;
+import android.content.*;
+import android.text.*;
 import android.view.*;
+import android.view.inputmethod.*;
 import android.widget.*;
 import android.graphics.*;
 import se.fnord.android.layout.*;
@@ -15,6 +17,9 @@ public class FridgeMagnets extends Activity {
 	String[] words = {"hello","buy","I","you","have","please","where",
 			          "how","go","Gothenburg","London","rakia","wine",
 			          "whisky","man","woman","boy","girl","to"};
+
+	private Controller controller = new Controller();
+	private EditText searchBox = null;
 	
     @Override
     public void onCreate(Bundle savedInstanceState) {
@@ -22,37 +27,125 @@ public class FridgeMagnets extends Activity {
         setContentView(R.layout.main);
         
         Arrays.sort(words);
-        
-        PredicateLayout l = (PredicateLayout) findViewById(R.id.magnets_bag);
-        for (int i = 0; i < words.length; i++) {
-        	Magnet t = new Magnet(this);
-            t.setText(words[i]);
-            l.addView(t, new PredicateLayout.LayoutParams(3, 3));
-        }
+
+        refreshBagOfWords(null);
+
+        View main = findViewById(R.id.main_view);
+        main.setFocusableInTouchMode(true);
+        main.setOnKeyListener(controller);
     }
-    
-    private static class Magnet extends TextView {
-    	public Magnet(Context context) {
-			super(context);
-            setTextColor(Color.BLACK);
-            setBackgroundColor(Color.WHITE);
-            setSingleLine(true);
-            setPadding(2, 2, 2, 2);
-            setClickable(true);
+
+	private void applyMagnetStyles(TextView view) {
+        view.setTextColor(Color.BLACK);
+        view.setBackgroundColor(Color.WHITE);
+        view.setSingleLine(true);
+        view.setPadding(2, 2, 2, 2);
+        view.setClickable(true);
+	}
+	
+	private void refreshBagOfWords(String prefix) {
+        PredicateLayout l = (PredicateLayout) findViewById(R.id.magnets_bag);
+        
+        l.removeAllViews();
+        
+        for (int i = 0; i < words.length; i++) {
+        	if (prefix != null && !words[i].startsWith(prefix))
+        		continue;
+
+        	TextView t = new TextView(this);
+            t.setText(words[i]);
+            t.setOnTouchListener(controller);
+        	applyMagnetStyles(t);
+            l.addView(t, new PredicateLayout.LayoutParams(3, 3));
+        }		
+	}
+
+	private void addWord(String word) {
+		PredicateLayout l = (PredicateLayout) findViewById(R.id.magnets_sentence);
+		
+		TextView t = new TextView(this);
+		t.setText(word);
+		applyMagnetStyles(t);
+		l.addView(t, new PredicateLayout.LayoutParams(3, 3));
+	}
+
+    private void showSearchBox() {
+    	if (searchBox != null)
+    		return;
+    	
+		PredicateLayout l = (PredicateLayout) findViewById(R.id.magnets_sentence);
+
+		EditText edit = new EditText(this);
+		edit.setInputType(InputType.TYPE_CLASS_TEXT |
+		                  InputType.TYPE_TEXT_FLAG_AUTO_COMPLETE);
+		edit.addTextChangedListener(controller);
+		edit.setOnKeyListener(controller);
+		applyMagnetStyles(edit);
+
+		l.addView(edit, new PredicateLayout.LayoutParams(
+								ViewGroup.LayoutParams.WRAP_CONTENT,
+								ViewGroup.LayoutParams.WRAP_CONTENT,
+								3, 3));
+		edit.requestFocus();
+		InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
+		imm.showSoftInput(edit, 0);
+		
+		searchBox = edit;
+	}
+
+	private void hideSearchBox() {
+    	if (searchBox == null)
+    		return;
+
+		InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
+		imm.hideSoftInputFromWindow(searchBox.getWindowToken(), 0);
+
+		PredicateLayout l = (PredicateLayout) findViewById(R.id.magnets_sentence);		
+		l.removeView(searchBox);
+
+		refreshBagOfWords(null);
+
+		searchBox = null;
+	}
+
+	private class Controller implements View.OnKeyListener, View.OnTouchListener, TextWatcher {
+    	
+    	@Override
+    	public boolean onKey(View view, int keyCode, KeyEvent event) {
+    		if (event.getAction() == KeyEvent.ACTION_DOWN) {    			
+    			if (searchBox == null && keyCode == KeyEvent.KEYCODE_SEARCH) {
+    				showSearchBox();
+    				return true;
+    			} else if (searchBox != null && keyCode == KeyEvent.KEYCODE_SEARCH) {
+    				hideSearchBox();
+    				return true;
+    			}
+    		}
+        	return false;
+        }
+    		
+    	@Override
+    	public boolean onTouch(View view, MotionEvent event) {
+			if (event.getAction() == MotionEvent.ACTION_UP) {
+				hideSearchBox();
+				addWord(((TextView) view).getText().toString());
+	            return true;
+			}
+            
+    		return false;
+    	}
+
+		@Override
+		public void afterTextChanged(Editable arg0) {
 		}
 
 		@Override
-    	public boolean onTouchEvent(MotionEvent event) {
-			if (event.getAction() == MotionEvent.ACTION_UP) {
-				Activity activity = (Activity) getContext();
-				PredicateLayout l = (PredicateLayout) activity.findViewById(R.id.magnets_sentence);
-				
-				Magnet t = new Magnet(activity);
-	            t.setText(getText());
-	            l.addView(t, new PredicateLayout.LayoutParams(3, 3));				
-			}
-            
-    		return super.onTouchEvent(event);
-    	}
+		public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
+		}
+
+		@Override
+		public void onTextChanged(CharSequence text, int arg1, int arg2, int arg3) {
+			refreshBagOfWords(text.toString());
+		}
     }
 }

src/android/Fridge/src/se/fnord/android/layout/PredicateLayout.java

@@ -29,7 +29,17 @@ public class PredicateLayout extends ViewGroup {
          * @param vertical_spacing Pixels between items, vertically
          */
         public LayoutParams(int horizontal_spacing, int vertical_spacing) {
-            super(0, 0);
+            this(0, 0, horizontal_spacing, vertical_spacing);
+        }
+
+        /**
+         * @param width 
+         * @param height
+         * @param horizontal_spacing Pixels between items, horizontally
+         * @param vertical_spacing Pixels between items, vertically
+         */
+        public LayoutParams(int width, int height, int horizontal_spacing, int vertical_spacing) {
+            super(width, height);
             this.horizontal_spacing = horizontal_spacing;
             this.vertical_spacing = vertical_spacing;     
         }