Added observables for component events.

Author: jmhofer

rxjava-contrib/rxjava-swing/src/main/java/rx/observables/SwingObservable.java

@@ -17,7 +17,9 @@
 
 import static rx.Observable.filter;
 
+import java.awt.Dimension;
 import java.awt.event.ActionEvent;
+import java.awt.event.ComponentEvent;
 import java.awt.event.KeyEvent;
 import java.awt.event.MouseEvent;
 import java.util.Set;
@@ -27,6 +29,7 @@
 
 import rx.Observable;
 import rx.swing.sources.AbstractButtonSource;
+import rx.swing.sources.ComponentEventSource;
 import rx.swing.sources.KeyEventSource;
 import rx.swing.sources.MouseEventSource;
 import rx.util.functions.Func1;
@@ -106,4 +109,26 @@ public static Observable<MouseEvent> fromMouseEvents(JComponent component) {
     public static Observable<MouseEvent> fromMouseMotionEvents(JComponent component) {
         return MouseEventSource.fromMouseMotionEventsOf(component);
     }
+    
+    /**
+     * Creates an observable corresponding to raw component events.
+     * 
+     * @param component
+     *            The component to register the observable for.
+     * @return Observable of component events.
+     */
+    public static Observable<ComponentEvent> fromComponentEvents(JComponent component) {
+        return ComponentEventSource.fromComponentEventsOf(component);
+    }
+
+    /**
+     * Creates an observable corresponding to component resize events.
+     * 
+     * @param component
+     *            The component to register the observable for.
+     * @return Observable emitting the current size of the given component after each resize event.
+     */
+    public static Observable<Dimension> fromResizing(JComponent component) {
+        return ComponentEventSource.fromResizing(component);
+    }
 }

rxjava-contrib/rxjava-swing/src/main/java/rx/swing/sources/ComponentEventSource.java

@@ -0,0 +1,100 @@
+/**
+ * Copyright 2013 Netflix, Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package rx.swing.sources;
+
+import java.awt.Dimension;
+import java.awt.event.ComponentEvent;
+import java.awt.event.ComponentListener;
+
+import javax.swing.JComponent;
+
+import rx.Observable;
+import rx.Observer;
+import rx.Subscription;
+import rx.subscriptions.Subscriptions;
+import rx.util.functions.Action0;
+import rx.util.functions.Func1;
+
+public enum ComponentEventSource { ; // no instances
+
+    public static Observable<ComponentEvent> fromComponentEventsOf(final JComponent component) {
+        return Observable.create(new Func1<Observer<ComponentEvent>, Subscription>() {
+            @Override
+            public Subscription call(final Observer<ComponentEvent> observer) {
+                final ComponentListener listener = new ComponentListener() {
+                    @Override
+                    public void componentHidden(ComponentEvent event) {
+                        observer.onNext(event);
+                    }
+
+                    @Override
+                    public void componentMoved(ComponentEvent event) {
+                        observer.onNext(event);
+                    }
+
+                    @Override
+                    public void componentResized(ComponentEvent event) {
+                        observer.onNext(event);
+                    }
+
+                    @Override
+                    public void componentShown(ComponentEvent event) {
+                        observer.onNext(event);
+                    }
+                };
+                component.addComponentListener(listener);
+                
+                return Subscriptions.create(new Action0() {
+                    @Override
+                    public void call() {
+                        component.removeComponentListener(listener);
+                    }
+                });
+            }
+        });
+    }
+    
+    public static Observable<Dimension> fromResizing(final JComponent component) {
+        return fromComponentEventsOf(component).filter(Predicate.RESIZED).map(new Func1<ComponentEvent, Dimension>() {
+            @Override
+            public Dimension call(ComponentEvent event) {
+                return event.getComponent().getSize();
+            }
+        });
+    }
+    
+    /**
+     * Predicates that help with filtering observables for specific component events. 
+     */
+    public enum Predicate implements Func1<ComponentEvent, Boolean> { 
+        RESIZED(ComponentEvent.COMPONENT_RESIZED),
+        HIDDEN(ComponentEvent.COMPONENT_HIDDEN),
+        MOVED(ComponentEvent.COMPONENT_MOVED),
+        SHOWN(ComponentEvent.COMPONENT_SHOWN);
+        
+        private final int id;
+        
+        private Predicate(int id) {
+            this.id = id;
+        }
+        
+        @Override
+        public Boolean call(ComponentEvent event) {
+            return event.getID() == id;
+        }
+        
+    }
+}