added sources for Slick

Former-commit-id: 1647fa32ef6894bd7db44f741f07c2f4dcdf9054
Former-commit-id: 0e5810dcfbe1fd59b13e7cabe9f1e93c5542da2d

lib/slick-source/org/newdawn/slick/gui/AbstractComponent.java

@@ -0,0 +1,182 @@
+package org.newdawn.slick.gui;
+
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+
+import org.newdawn.slick.Graphics;
+import org.newdawn.slick.Input;
+import org.newdawn.slick.SlickException;
+import org.newdawn.slick.geom.Rectangle;
+import org.newdawn.slick.util.InputAdapter;
+
+/**
+ * The utility class to handle all the input related gubbins for basic GUI
+ * components
+ * 
+ * @author kevin
+ */
+public abstract class AbstractComponent extends InputAdapter {
+	/** The component that currently has focus */
+	private static AbstractComponent currentFocus = null;
+	
+	/** The game container */
+	protected GUIContext container;
+
+	/** Listeners for the component to notify */
+	protected Set listeners;
+
+	/** True if this component currently has focus */
+	private boolean focus = false;
+
+	/** The input we're responding to */
+	protected Input input;
+	
+	/**
+	 * Create a new component
+	 * 
+	 * @param container
+	 *            The container displaying this component
+	 */
+	public AbstractComponent(GUIContext container) {
+		this.container = container;
+
+		listeners = new HashSet();
+
+		input = container.getInput();
+		input.addPrimaryListener(this);
+
+		setLocation(0, 0);
+	}
+	
+	/**
+	 * Add a component listener to be informed when the component sees fit.
+	 * 
+	 * It will ignore listeners already added.
+	 * 
+	 * @param listener
+	 *            listener
+	 */
+	public void addListener(ComponentListener listener) {
+		listeners.add(listener);
+	}
+
+	/**
+	 * Remove a component listener.
+	 * 
+	 * It will ignore if the listener wasn't added.
+	 * 
+	 * @param listener
+	 *            listener
+	 */
+	public void removeListener(ComponentListener listener) {
+		listeners.remove(listener);
+	}
+
+	/**
+	 * Notify all the listeners.
+	 */
+	protected void notifyListeners() {
+		Iterator it = listeners.iterator();
+		while (it.hasNext()) {
+			((ComponentListener) it.next()).componentActivated(this);
+		}
+	}
+
+	/**
+	 * Render this component to the screen
+	 * 
+	 * @param container
+	 *            The container displaying this component
+	 * @param g
+	 *            The graphics context used to render to the display
+	 * @throws SlickException
+	 *             If there has been an error rendering the component
+	 */
+	public abstract void render(GUIContext container, Graphics g)
+			throws SlickException;
+
+	/**
+	 * Moves the component.
+	 * 
+	 * @param x
+	 *            X coordinate
+	 * @param y
+	 *            Y coordinate
+	 */
+	public abstract void setLocation(int x, int y);
+
+	/**
+	 * Returns the position in the X coordinate
+	 * 
+	 * @return x
+	 */
+	public abstract int getX();
+
+	/**
+	 * Returns the position in the Y coordinate
+	 * 
+	 * @return y
+	 */
+	public abstract int getY();
+
+	/**
+	 * Get the width of the component
+	 * 
+	 * @return The width of the component
+	 */
+	public abstract int getWidth();
+
+	/**
+	 * Get the height of the component
+	 * 
+	 * @return The height of the component
+	 */
+	public abstract int getHeight();
+
+	/**
+	 * Indicate whether this component should be focused or not
+	 * 
+	 * @param focus
+	 *            if the component should be focused
+	 */
+	public void setFocus(boolean focus) {
+		if (focus) {
+			if (currentFocus != null) {
+				currentFocus.setFocus(false);
+			}
+			currentFocus = this;
+		} else {
+			if (currentFocus == this) {
+				currentFocus = null;
+			}
+		}
+		this.focus = focus;
+	}
+
+	/**
+	 * Check if this component currently has focus
+	 * 
+	 * @return if this field currently has focus
+	 */
+	public boolean hasFocus() {
+		return focus;
+	}
+
+	/**
+	 * Consume the event currently being processed
+	 */
+	protected void consumeEvent() {
+		input.consumeEvent();
+	}
+	
+	/**
+	 * Gives the focus to this component with a click of the mouse.
+	 * 
+	 * @see org.newdawn.slick.gui.AbstractComponent#mouseReleased(int, int, int)
+	 */
+	public void mouseReleased(int button, int x, int y) {
+		setFocus(Rectangle.contains(x, y, getX(), getY(), getWidth(),
+				getHeight()));
+	}
+}