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org.metawidget.android.widget.widgetbuilder.AndroidWidgetBuilder Maven / Gradle / Ivy
// Metawidget
//
// This file is dual licensed under both the LGPL
// (http://www.gnu.org/licenses/lgpl-2.1.html) and the EPL
// (http://www.eclipse.org/org/documents/epl-v10.php). As a
// recipient of Metawidget, you may choose to receive it under either
// the LGPL or the EPL.
//
// Commercial licenses are also available. See http://metawidget.org
// for details.
package org.metawidget.android.widget.widgetbuilder;
import static org.metawidget.inspector.InspectionResultConstants.*;
import java.util.Collection;
import java.util.Date;
import java.util.List;
import java.util.Map;
import org.metawidget.android.widget.AndroidMetawidget;
import org.metawidget.android.widget.AndroidValueAccessor;
import org.metawidget.android.widget.Stub;
import org.metawidget.android.widget.widgetprocessor.binding.BindingConverter;
import org.metawidget.iface.MetawidgetException;
import org.metawidget.util.ClassUtils;
import org.metawidget.util.CollectionUtils;
import org.metawidget.util.WidgetBuilderUtils;
import org.metawidget.util.simple.StringUtils;
import org.metawidget.widgetbuilder.iface.WidgetBuilder;
import android.R;
import android.content.Context;
import android.text.InputFilter;
import android.text.SpannableStringBuilder;
import android.text.method.DateKeyListener;
import android.text.method.DigitsKeyListener;
import android.text.method.PasswordTransformationMethod;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
/**
* WidgetBuilder for Android environments.
*
* Creates native Android Views, such as EditText and Spinner, to suit the
* inspected fields.
*
* @author Richard Kennard
*/
public class AndroidWidgetBuilder
implements WidgetBuilder, AndroidValueAccessor {
//
// Public methods
//
@SuppressWarnings( "deprecation" )
public Object getValue( View view ) {
// CheckBox
if ( view instanceof CheckBox ) {
return Boolean.valueOf( ( (CheckBox) view ).isChecked() );
}
// TextView/EditText
if ( view instanceof TextView ) {
CharSequence text = ( (TextView) view ).getText();
// Convert SpannableStringBuilder to Strings
//
// This is a little controversial, but it's painful to handle SpannableStringBuilder
// everywhere in client code
if ( text instanceof SpannableStringBuilder ) {
text = text.toString();
}
return text;
}
// DatePicker
if ( view instanceof DatePicker ) {
DatePicker datePicker = (DatePicker) view;
return new Date( datePicker.getYear() - 1900, datePicker.getMonth(), datePicker.getDayOfMonth() );
}
// Spinner
if ( view instanceof Spinner ) {
return ( (Spinner) view ).getSelectedItem();
}
return null;
}
@SuppressWarnings( "deprecation" )
public boolean setValue( Object value, View view ) {
// CheckBox
if ( view instanceof CheckBox ) {
( (CheckBox) view ).setChecked( (Boolean) value );
return true;
}
// TextView/EditText
if ( view instanceof TextView ) {
( (TextView) view ).setText( StringUtils.quietValueOf( value ) );
return true;
}
// DatePicker
if ( view instanceof DatePicker ) {
Date date = (Date) value;
( (DatePicker) view ).updateDate( 1900 + date.getYear(), date.getMonth(), date.getDate() );
return true;
}
// Spinner
if ( view instanceof Spinner ) {
AdapterView adapterView = (AdapterView) view;
@SuppressWarnings( "unchecked" )
ArrayAdapter adapter = (ArrayAdapter) adapterView.getAdapter();
adapterView.setSelection( adapter.getPosition( value ) );
return true;
}
// Unknown
return false;
}
public View buildWidget( String elementName, Map attributes, AndroidMetawidget metawidget ) {
// Hidden
if ( TRUE.equals( attributes.get( HIDDEN ) ) ) {
return new Stub( metawidget.getContext() );
}
// Action
if ( ACTION.equals( elementName ) ) {
Button button = new Button( metawidget.getContext() );
button.setText( metawidget.getLabelString( attributes ) );
return button;
}
// Lookup the Class
Class clazz = WidgetBuilderUtils.getActualClassOrType( attributes, String.class, getClass().getClassLoader() );
// Support mandatory Booleans (can be rendered as a checkbox, even though they have a
// Lookup)
if ( Boolean.class.equals( clazz ) && TRUE.equals( attributes.get( REQUIRED ) ) ) {
return new CheckBox( metawidget.getContext() );
}
if ( clazz != null ) {
// String Lookups
String lookup = attributes.get( LOOKUP );
if ( lookup != null && !"".equals( lookup ) ) {
Spinner spinner = new Spinner( metawidget.getContext() );
// Empty option
List lookupList = CollectionUtils.newArrayList();
if ( WidgetBuilderUtils.needsEmptyLookupItem( attributes ) ) {
lookupList.add( null );
}
// Lookup the Class
//
// (use TYPE, not ACTUAL_TYPE, because an Enum with a value will get a type of Enum$1)
Class nonActualType;
String type = attributes.get( TYPE );
if ( type != null ) {
nonActualType = ClassUtils.niceForName( type );
} else {
nonActualType = null;
}
BindingConverter bindingConverter = metawidget.getWidgetProcessor( BindingConverter.class );
for ( String value : CollectionUtils.fromString( lookup ) ) {
Object convertedValue = value;
if ( bindingConverter != null && nonActualType != null ) {
convertedValue = bindingConverter.convertFromString( value, nonActualType );
}
lookupList.add( convertedValue );
}
// Labels
List lookupLabelsList = null;
String lookupLabels = attributes.get( LOOKUP_LABELS );
// (CollectionUtils.fromString returns unmodifiable EMPTY_LIST if empty)
lookupLabelsList = CollectionUtils.fromString( lookupLabels );
if ( !lookupLabelsList.isEmpty() && WidgetBuilderUtils.needsEmptyLookupItem( attributes ) ) {
lookupLabelsList.add( 0, null );
}
ArrayAdapter adapter = new LookupArrayAdapter( metawidget.getContext(), lookupList, lookupLabelsList );
spinner.setAdapter( adapter );
return spinner;
}
if ( clazz.isPrimitive() ) {
// booleans
if ( boolean.class.equals( clazz ) ) {
return new CheckBox( metawidget.getContext() );
}
if ( char.class.equals( clazz ) ) {
EditText editText = new EditText( metawidget.getContext() );
editText.setFilters( new InputFilter[] { new InputFilter.LengthFilter( 1 ) } );
return editText;
}
EditText editText = new EditText( metawidget.getContext() );
// DigitsInputMethod is 0-9 and +
if ( byte.class.equals( clazz ) || short.class.equals( clazz ) || int.class.equals( clazz ) || long.class.equals( clazz ) ) {
editText.setKeyListener( new DigitsKeyListener() );
}
return editText;
}
// Strings
if ( String.class.equals( clazz ) ) {
EditText editText = new EditText( metawidget.getContext() );
if ( TRUE.equals( attributes.get( MASKED ) ) ) {
editText.setTransformationMethod( PasswordTransformationMethod.getInstance() );
}
if ( TRUE.equals( attributes.get( LARGE ) ) ) {
editText.setMinLines( 3 );
}
String maximumLength = attributes.get( MAXIMUM_LENGTH );
if ( maximumLength != null && !"".equals( maximumLength ) ) {
editText.setFilters( new InputFilter[] { new InputFilter.LengthFilter( Integer.parseInt( maximumLength ) ) } );
}
return editText;
}
// Characters
if ( Character.class.equals( clazz ) ) {
EditText editText = new EditText( metawidget.getContext() );
editText.setFilters( new InputFilter[] { new InputFilter.LengthFilter( 1 ) } );
return editText;
}
// Dates
if ( Date.class.equals( clazz ) ) {
// Not-nullable dates can use a DatePicker...
if ( TRUE.equals( attributes.get( REQUIRED ) ) ) {
return new DatePicker( metawidget.getContext() );
}
// ...but nullable ones need a TextBox
EditText editText = new EditText( metawidget.getContext() );
editText.setKeyListener( new DateKeyListener() );
return editText;
}
// Numbers
if ( Number.class.isAssignableFrom( clazz ) ) {
EditText editText = new EditText( metawidget.getContext() );
// DigitsInputMethod is 0-9 and +
if ( Byte.class.isAssignableFrom( clazz ) || Short.class.isAssignableFrom( clazz ) || Integer.class.isAssignableFrom( clazz ) || Long.class.isAssignableFrom( clazz ) ) {
editText.setKeyListener( new DigitsKeyListener() );
}
return editText;
}
// Collections
if ( Collection.class.isAssignableFrom( clazz ) ) {
return new Stub( metawidget.getContext() );
}
}
// Not simple, but don't expand
if ( TRUE.equals( attributes.get( DONT_EXPAND ) ) ) {
return new EditText( metawidget.getContext() );
}
// Nested Metawidget
return null;
}
//
// Inner class
//
/**
* ArrayAdapter for Spinner whose values use a lookup.
*/
static class LookupArrayAdapter
extends ArrayAdapter {
//
// Private members
//
private List mLabels;
//
// Constructor
//
/**
* @param labels
* List of human-readable labels. Never null.
*/
public LookupArrayAdapter( Context context, List values, List labels ) {
super( context, 0, values );
if ( labels != null && !labels.isEmpty() ) {
if ( labels.size() != values.size() ) {
throw MetawidgetException.newException( "Labels list must be same size as values list" );
}
mLabels = labels;
}
}
//
// Public methods
//
@Override
public View getView( int position, View convertView, ViewGroup parentView ) {
return initView( position, convertView, parentView, R.layout.simple_spinner_item );
}
@Override
public View getDropDownView( int position, View convertView, ViewGroup parentView ) {
return initView( position, convertView, parentView, R.layout.simple_spinner_dropdown_item );
}
//
// Private methods
//
private View initView( int position, View convertView, ViewGroup parentView, int textViewResourceId ) {
View viewToUse = convertView;
if ( viewToUse == null ) {
Context context = getContext();
if ( context != null ) {
viewToUse = ( (LayoutInflater) context.getSystemService( Context.LAYOUT_INFLATER_SERVICE ) ).inflate( textViewResourceId, parentView, false );
}
// Just-in-time create: layoutInflater.inflate does not work during onMeasure. Why?
if ( viewToUse == null ) {
viewToUse = new TextView( context );
}
}
if ( mLabels == null ) {
( (TextView) viewToUse ).setText( StringUtils.quietValueOf( getItem( position ) ) );
} else {
( (TextView) viewToUse ).setText( StringUtils.quietValueOf( mLabels.get( position ) ) );
}
return viewToUse;
}
}
}
