v0.7.4b: refactored input event handling structure

SPD-classes/src/main/java/com/watabou/input/PointerEvent.java

@@ -0,0 +1,104 @@
+/*
+ * Pixel Dungeon
+ * Copyright (C) 2012-2015 Oleg Dolya
+ *
+ * Shattered Pixel Dungeon
+ * Copyright (C) 2014-2019 Evan Debenham
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package com.watabou.input;
+
+import com.watabou.utils.PointF;
+import com.watabou.utils.Signal;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+
+public class PointerEvent {
+	
+	public PointF start;
+	public PointF current;
+	public int id;
+	public boolean down;
+	
+	public PointerEvent( int x, int y, int id, boolean down){
+		start = current = new PointF(x, y);
+		this.id = id;
+		this.down = down;
+	}
+	
+	public void update( PointerEvent other ){
+		this.current = other.current;
+	}
+	
+	public void update( int x, int y ){
+		current.set( x, y );
+	}
+	
+	public PointerEvent up() {
+		down = false;
+		return this;
+	}
+	
+	// **********************
+	// *** Static members ***
+	// **********************
+	
+	private static Signal<PointerEvent> pointerSignal = new Signal<>( true );
+	
+	public static void addPointerListener( Signal.Listener<PointerEvent> listener ){
+		pointerSignal.add(listener);
+	}
+	
+	public static void removePointerListener( Signal.Listener<PointerEvent> listener ){
+		pointerSignal.remove(listener);
+	}
+	
+	public static void clearListeners(){
+		pointerSignal.removeAll();
+	}
+	
+	// Accumulated pointer events
+	private static ArrayList<PointerEvent> pointerEvents = new ArrayList<>();
+	private static HashMap<Integer, PointerEvent> activePointers = new HashMap<>();
+	
+	public static synchronized void addPointerEvent( PointerEvent event ){
+		pointerEvents.add( event );
+	}
+	
+	public static synchronized void processPointerEvents(){
+		for (PointerEvent p : pointerEvents){
+			if (activePointers.containsKey(p.id)){
+				PointerEvent existing = activePointers.get(p.id);
+				existing.current = p.current;
+				if (existing.down == p.down){
+					pointerSignal.dispatch( null );
+				} else if (p.down) {
+					pointerSignal.dispatch( existing );
+				} else {
+					activePointers.remove(existing.id);
+					pointerSignal.dispatch(existing.up());
+				}
+			} else {
+				if (p.down) {
+					activePointers.put(p.id, p);
+				}
+				pointerSignal.dispatch(p);
+			}
+		}
+		pointerEvents.clear();
+	}
+}