Allow modification of selection (select all or invert) from the CAB.

core/res/values-v16/styles.xml

@@ -23,6 +23,7 @@
 	
 	<style name="DefaultTextView" parent="android:Widget.Holo.Light.TextView">
 		<item name="android:textSize">@dimen/text_default</item>
+		<item name="android:fontFamily">sans-serif-light</item>
 	</style>
 
 	<style name="LabelTextView" parent="android:Widget.Holo.Light.TextView">

core/res/values/strings.xml

@@ -59,6 +59,8 @@
 		<item quantity="one">%1$d files selected</item>
 		<item quantity="other">%1$d files selected</item>
 	</plurals>
+	<string name="navigation_selectall">Select all</string>
+	<string name="navigation_invertselection">Invert selection</string>
 	
 	<string name="status_status">STATUS: %1$s</string>
 	<string name="status_waiting">Waiting to check&#8230;</string>

core/src/org/transdroid/core/gui/DetailsFragment.java

@@ -15,6 +15,7 @@ import org.transdroid.core.R;
 import org.transdroid.core.gui.lists.DetailsAdapter;
 import org.transdroid.core.gui.lists.SimpleListItemAdapter;
 import org.transdroid.core.gui.navigation.NavigationHelper;
+import org.transdroid.core.gui.navigation.SelectionManagerMode;
 import org.transdroid.daemon.Daemon;
 import org.transdroid.daemon.Priority;
 import org.transdroid.daemon.Torrent;
@@ -248,13 +249,23 @@ public class DetailsFragment extends SherlockFragment {
 
 	private MultiChoiceModeListenerCompat onDetailsSelected = new MultiChoiceModeListenerCompat() {
 
+		SelectionManagerMode selectionManagerMode;
+		
 		@Override
 		public boolean onCreateActionMode(ActionMode mode, Menu menu) {
 			// Show contextual action bar to start/stop/remove/etc. torrents in batch mode
 			mode.getMenuInflater().inflate(R.menu.fragment_details_file, menu);
+			selectionManagerMode = new SelectionManagerMode(detailsList, R.plurals.navigation_filesselected);
+			selectionManagerMode.setOnlyCheckClass(TorrentFile.class);
+			selectionManagerMode.onCreateActionMode(mode, menu);
 			return true;
 		}
 
+		@Override
+		public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
+			return selectionManagerMode.onPrepareActionMode(mode, menu);
+		}
+
 		@Override
 		public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
 
@@ -292,25 +303,12 @@ public class DetailsFragment extends SherlockFragment {
 
 		@Override
 		public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
-			// Show the number of selected files in the CAB
+			selectionManagerMode.onItemCheckedStateChanged(mode, position, id, checked);
-			// torrentsList.getCheckedItemPositions().size() ?
-			int checkedCount = 0;
-			for (int i = 0; i < detailsList.getCheckedItemPositions().size(); i++) {
-				if (detailsList.getCheckedItemPositions().valueAt(i)
-						&& detailsList.getAdapter().getItem(detailsList.getCheckedItemPositions().keyAt(i)) instanceof TorrentFile)
-					checkedCount++;
-			}
-			mode.setTitle(getResources().getQuantityString(R.plurals.navigation_filesselected, checkedCount,
-					checkedCount));
-		}
-
-		@Override
-		public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
-			return false;
 		}
 
 		@Override
 		public void onDestroyActionMode(ActionMode mode) {
+			selectionManagerMode.onDestroyActionMode(mode);
 		}
 
 	};

core/src/org/transdroid/core/gui/TorrentsFragment.java

@@ -17,6 +17,7 @@ import org.transdroid.core.app.settings.ApplicationSettings;
 import org.transdroid.core.gui.lists.TorrentsAdapter;
 import org.transdroid.core.gui.lists.TorrentsAdapter_;
 import org.transdroid.core.gui.navigation.NavigationFilter;
+import org.transdroid.core.gui.navigation.SelectionManagerMode;
 import org.transdroid.daemon.Daemon;
 import org.transdroid.daemon.Torrent;
 import org.transdroid.daemon.TorrentsComparator;
@@ -182,15 +183,23 @@ public class TorrentsFragment extends SherlockFragment {
 	}
 
 	private MultiChoiceModeListenerCompat onTorrentsSelected = new MultiChoiceModeListenerCompat() {
-
+		
+		SelectionManagerMode selectionManagerMode;
+		
 		@Override
 		public boolean onCreateActionMode(ActionMode mode, Menu menu) {
 			// Show contextual action bar to start/stop/remove/etc. torrents in batch mode
 			mode.getMenuInflater().inflate(R.menu.fragment_torrents_cab, menu);
+			selectionManagerMode = new SelectionManagerMode(torrentsList, R.plurals.navigation_torrentsselected);
+			selectionManagerMode.onCreateActionMode(mode, menu);
 			return true;
 		}
 
 		@Override
+		public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
+			return selectionManagerMode.onPrepareActionMode(mode, menu);
+		}
+
 		public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
 
 			// Get checked torrents
@@ -237,24 +246,12 @@ public class TorrentsFragment extends SherlockFragment {
 
 		@Override
 		public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
-			// Show the number of selected torrents in the CAB
+			selectionManagerMode.onItemCheckedStateChanged(mode, position, id, checked);
-			// torrentsList.getCheckedItemPositions().size() ?
-			int checkedCount = 0;
-			for (int i = 0; i < torrentsList.getCheckedItemPositions().size(); i++) {
-				if (torrentsList.getCheckedItemPositions().valueAt(i))
-					checkedCount++;
-			}
-			mode.setTitle(getResources().getQuantityString(R.plurals.navigation_torrentsselected, checkedCount,
-					checkedCount));
-		}
-
-		@Override
-		public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
-			return false;
 		}
 
 		@Override
 		public void onDestroyActionMode(ActionMode mode) {
+			selectionManagerMode.onDestroyActionMode(mode);
 		}
 
 	};

core/src/org/transdroid/core/gui/navigation/SelectionManagerMode.java

@@ -0,0 +1,110 @@
+package org.transdroid.core.gui.navigation;
+
+import org.transdroid.core.gui.navigation.SelectionModificationSpinner.OnModificationActionSelectedListener;
+
+import android.util.SparseBooleanArray;
+import android.view.ViewGroup;
+import android.widget.ListView;
+
+import com.actionbarsherlock.view.ActionMode;
+import com.actionbarsherlock.view.Menu;
+import com.actionbarsherlock.view.MenuItem;
+import com.actionbarsherlock.view.SherlockListView.MultiChoiceModeListenerCompat;
+
+/**
+ * A helper to implement {@link ListView} selection modification behaviour with the {@link SelectionModificationSpinner}
+ * by implementing the specific actions and providing a title based on the number of currently selected items. It is
+ * important that the provided list was instantiated already.
+ * @author Eric Kok
+ */
+public class SelectionManagerMode implements MultiChoiceModeListenerCompat, OnModificationActionSelectedListener {
+
+	private ListView managedList;
+	private int titleTemplateResource;
+	private Class<?> onlyCheckClass = null;
+
+	/**
+	 * Instantiates the helper by binding it to a specific {@link ListView} and providing the text resource to display
+	 * as title in the spinner.
+	 * @param managedList The list to manage the selection for and execute selection action to
+	 * @param titleTemplateResource The string resource id to show as the spinners title; the number of selected items
+	 *            will be supplied as numeric formatting argument
+	 */
+	public SelectionManagerMode(ListView managedList, int titleTemplateResource) {
+		this.managedList = managedList;
+		this.titleTemplateResource = titleTemplateResource;
+	}
+
+	/**
+	 * Set the class type of items that are allowed to be checked in the {@link ListView}. Defaults to null, which means
+	 * every list view row can be checked.
+	 * @param onlyCheckClass The {@link Class} instance to use to check list item types against
+	 */
+	public void setOnlyCheckClass(Class<?> onlyCheckClass) {
+		this.onlyCheckClass = onlyCheckClass;
+	}
+	
+	@Override
+	public boolean onCreateActionMode(ActionMode mode, Menu menu) {
+		// Allow modification of selection through a spinner
+		SelectionModificationSpinner selectionSpinner = new SelectionModificationSpinner(managedList.getContext());
+		selectionSpinner.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
+				ViewGroup.LayoutParams.MATCH_PARENT));
+		selectionSpinner.setOnModificationActionSelectedListener(this);
+		mode.setCustomView(selectionSpinner);
+		return true;
+	}
+
+	@Override
+	public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
+		return false;
+	}
+
+	@Override
+	public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
+		int checkedCount = 0;
+		for (int i = 0; i < managedList.getCheckedItemPositions().size(); i++) {
+			if (managedList.getCheckedItemPositions().valueAt(i))
+				checkedCount++;
+		}
+		((SelectionModificationSpinner) mode.getCustomView()).updateTitle(managedList.getContext().getResources()
+				.getQuantityString(titleTemplateResource, checkedCount, checkedCount));
+	}
+
+	@Override
+	public void onDestroyActionMode(ActionMode mode) {
+	}
+
+	@Override
+	public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
+		return false;
+	}
+
+	/**
+	 * Implements the {@link SelectionModificationSpinner}'s invert selection command by flipping the checked status for
+	 * each (enabled) items in the {@link ListView}.
+	 */
+	@Override
+	public void invertSelection() {
+		SparseBooleanArray checked = managedList.getCheckedItemPositions();
+		for (int i = 0; i < managedList.getAdapter().getCount(); i++) {
+			if (managedList.getAdapter().isEnabled(i)
+					&& (onlyCheckClass == null || onlyCheckClass.isInstance(managedList.getItemAtPosition(i))))
+				managedList.setItemChecked(i, !checked.get(i, false));
+		}
+	}
+
+	/**
+	 * Implements the {@link SelectionModificationSpinner}'s select all command by checking each (enabled) item in the
+	 * {@link ListView}.
+	 */
+	@Override
+	public void selectionAll() {
+		for (int i = 0; i < managedList.getAdapter().getCount(); i++) {
+			if (managedList.getAdapter().isEnabled(i)
+					&& (onlyCheckClass == null || onlyCheckClass.isInstance(managedList.getItemAtPosition(i))))
+				managedList.setItemChecked(i, true);
+		}
+	}
+
+}

core/src/org/transdroid/core/gui/navigation/SelectionModificationSpinner.java

@@ -0,0 +1,98 @@
+package org.transdroid.core.gui.navigation;
+
+import org.transdroid.core.R;
+
+import android.content.Context;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ArrayAdapter;
+import android.widget.Spinner;
+import android.widget.TextView;
+
+/**
+ * Spinner that holds actions that can be performed on list selections. The spinner itself has some title, which can for
+ * example be used to show the number of selected items.
+ * @author Eric Kok
+ */
+public class SelectionModificationSpinner extends Spinner {
+
+	private SelectionDropDownAdapter selectionAdapter;
+	private OnModificationActionSelectedListener onModificationActionSelected = null;
+
+	/**
+	 * Instantiates a spinner that contains some fixed actions for a user to modify selections.
+	 * @param context The interface context where the spinner will be shown in
+	 */
+	public SelectionModificationSpinner(Context context) {
+		super(context);
+		selectionAdapter = new SelectionDropDownAdapter(context);
+		setAdapter(selectionAdapter);
+	}
+
+	/**
+	 * Updates the fixed title text shown in the spinner, regardless of spinner item action selection.
+	 * @param title The new static string to show, such as the number of selected items
+	 */
+	public void updateTitle(String title) {
+		selectionAdapter.titleView.setText(title);
+		invalidate();
+	}
+
+	/**
+	 * Sets the listener for action selection events.
+	 * @param onModificationActionSelected The listener that handles performing of the actions as selected in this
+	 *            spinner by the user
+	 */
+	public void setOnModificationActionSelectedListener(OnModificationActionSelectedListener onModificationActionSelected) {
+		this.onModificationActionSelected = onModificationActionSelected;
+	}
+
+	@Override
+	public void setSelection(int position) {
+		if (position == 0) {
+			onModificationActionSelected.selectionAll();
+		} else if (position == 1) {
+			onModificationActionSelected.invertSelection();
+		}
+		super.setSelection(position);
+	}
+	
+	/**
+	 * Local adapter that holds the actions which can be performed and a title text view that always shows instead of a
+	 * list item as in a normal spinner.
+	 */
+	private class SelectionDropDownAdapter extends ArrayAdapter<String> {
+
+		protected TextView titleView = null;
+
+		public SelectionDropDownAdapter(Context context) {
+			super(context, android.R.layout.simple_list_item_1, new String[] {
+					context.getString(R.string.navigation_selectall),
+					context.getString(R.string.navigation_invertselection) });
+			titleView = new TextView(getContext());
+		}
+
+		@Override
+		public View getView(int position, View convertView, ViewGroup parent) {
+			// This returns the singleton text view showing the title with the number of selected items
+			return titleView;
+		}
+
+		@Override
+		public View getDropDownView(int position, View convertView, ViewGroup parent) {
+			// This returns the actions to show in the spinner list
+			return super.getView(position, convertView, parent);
+		}
+
+	}
+
+	/**
+	 * Interface to implement if an interface want to respond to selection modification actions.
+	 */
+	public interface OnModificationActionSelectedListener {
+		public void invertSelection();
+
+		public void selectionAll();
+	}
+
+}