Changeset 8548 in josm
- Timestamp:
- 2015-07-01T19:31:36+02:00 (9 years ago)
- File:
-
- 1 edited
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trunk/src/org/openstreetmap/josm/gui/MapView.java
r8510 r8548 946 946 return Utils.join("; ", layerInfo); 947 947 } 948 949 /** 950 * This is a listener that gets informed whenever repaint is called for this MapView. 951 * <p> 952 * This is the only safe method to find changes to the map view, since many components call MapView.repaint() directly. 953 * @author Michael Zangl 954 */ 955 public interface RepaintListener { 956 /** 957 * Called when any repaint method is called (using default arguments if required). 958 * @param tm see {@link JComponent#repaint(long, int, int, int, int)} 959 * @param x see {@link JComponent#repaint(long, int, int, int, int)} 960 * @param y see {@link JComponent#repaint(long, int, int, int, int)} 961 * @param width see {@link JComponent#repaint(long, int, int, int, int)} 962 * @param height see {@link JComponent#repaint(long, int, int, int, int)} 963 */ 964 void repaint(long tm, int x, int y, int width, int height); 965 } 966 967 private final CopyOnWriteArrayList<RepaintListener> repaintListeners = new CopyOnWriteArrayList<>(); 968 969 /** 970 * Adds a listener that gets informed whenever repaint() is called for this class. 971 * @param l The listener. 972 */ 973 public void addRepaintListener(RepaintListener l) { 974 repaintListeners.add(l); 975 } 976 977 /** 978 * Removes a registered repaint listener. 979 * @param l The listener. 980 */ 981 public void removeRepaintListener(RepaintListener l) { 982 repaintListeners.remove(l); 983 } 984 985 @Override 986 public void repaint(long tm, int x, int y, int width, int height) { 987 // This is the main repaint method, all other methods are convenience methods and simply call this method. This is just an observation, not a must, but seems to be true for all implementations I found so far. 988 if (repaintListeners != null) { 989 // Might get called early in super constructor 990 for (RepaintListener l : repaintListeners) { 991 l.repaint(tm, x, y, width, height); 992 } 993 } 994 super.repaint(tm, x, y, width, height); 995 } 948 996 }
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