19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.lwawt;
27
28 import java.awt.Component;
29 import java.awt.Container;
30 import java.awt.Cursor;
31 import java.awt.Point;
32
33 import java.util.concurrent.atomic.AtomicBoolean;
34
35 import sun.awt.SunToolkit;
36
37 public abstract class LWCursorManager {
38
39 // A flag to indicate if the update is scheduled, so we don't
40 // process it twice
41 private AtomicBoolean updatePending = new AtomicBoolean(false);
42
43 protected LWCursorManager() {
44 }
45
46 /*
47 * Sets the cursor to correspond the component currently under mouse.
48 *
49 * This method should not be executed on the toolkit thread as it
50 * calls to user code (e.g. Container.findComponentAt).
51 */
52 public void updateCursor() {
53 updatePending.set(false);
54 updateCursorImpl();
55 }
56
57 /*
58 * Schedules updating the cursor on the corresponding event dispatch
59 * thread for the given window.
60 *
61 * This method is called on the toolkit thread as a result of a
62 * native update cursor request (e.g. WM_SETCURSOR on Windows).
63 */
64 public void updateCursorLater(LWWindowPeer window) {
65 if (updatePending.compareAndSet(false, true)) {
66 Runnable r = new Runnable() {
67 @Override
68 public void run() {
69 updateCursor();
70 }
71 };
72 SunToolkit.executeOnEventHandlerThread(window.getTarget(), r);
73 }
74 }
75
76 private void updateCursorImpl() {
77 LWWindowPeer windowUnderCursor = LWWindowPeer.getWindowUnderCursor();
78 Point cursorPos = getCursorPosition();
79 LWComponentPeer<?, ?> componentUnderCursor = null;
80 // TODO: it's possible to get the component under cursor directly as
81 // it's stored in LWWindowPee anyway (lastMouseEventPeer)
82 if (windowUnderCursor != null) {
83 componentUnderCursor = windowUnderCursor.findPeerAt(cursorPos.x, cursorPos.y);
84 }
85 Cursor cursor = null;
86 if (componentUnderCursor != null) {
87 Component c = componentUnderCursor.getTarget();
88 if (c instanceof Container) {
89 Point p = componentUnderCursor.getLocationOnScreen();
90 c = ((Container)c).findComponentAt(cursorPos.x - p.x, cursorPos.y - p.y);
91 }
92 // Traverse up to the first visible, enabled and showing component
93 while (c != null) {
94 if (c.isVisible() && c.isEnabled() && (c.getPeer() != null)) {
95 break;
96 }
97 c = c.getParent();
98 }
99 if (c != null) {
100 cursor = c.getCursor();
101 }
102 }
103 // TODO: default cursor for modal blocked windows
104 setCursor(windowUnderCursor, cursor);
105 }
106
107 /*
108 * Returns the current cursor position.
109 */
110 // TODO: make it public to reuse for MouseInfo
111 protected abstract Point getCursorPosition();
112
113 /*
114 * Sets a cursor. The cursor can be null if the mouse is not over a Java window.
115 */
116 protected abstract void setCursor(LWWindowPeer windowUnderCursor, Cursor cursor);
117
118 }
|
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.lwawt;
27
28 import java.awt.Component;
29 import java.awt.Container;
30 import java.awt.Cursor;
31 import java.awt.Point;
32
33 import java.util.concurrent.atomic.AtomicBoolean;
34
35 import sun.awt.SunToolkit;
36
37 public abstract class LWCursorManager {
38
39 /**
40 * A flag to indicate if the update is scheduled, so we don't process it
41 * twice.
42 */
43 private final AtomicBoolean updatePending = new AtomicBoolean(false);
44
45 protected LWCursorManager() {
46 }
47
48 /**
49 * Sets the cursor to correspond the component currently under mouse.
50 *
51 * This method should not be executed on the toolkit thread as it
52 * calls to user code (e.g. Container.findComponentAt).
53 */
54 public final void updateCursor() {
55 updatePending.set(false);
56 updateCursorImpl();
57 }
58
59 /**
60 * Schedules updating the cursor on the corresponding event dispatch
61 * thread for the given window.
62 *
63 * This method is called on the toolkit thread as a result of a
64 * native update cursor request (e.g. WM_SETCURSOR on Windows).
65 */
66 public final void updateCursorLater(final LWWindowPeer window) {
67 if (updatePending.compareAndSet(false, true)) {
68 Runnable r = new Runnable() {
69 @Override
70 public void run() {
71 updateCursor();
72 }
73 };
74 SunToolkit.executeOnEventHandlerThread(window.getTarget(), r);
75 }
76 }
77
78 private void updateCursorImpl() {
79 final Point cursorPos = getCursorPosition();
80 final Component c = findComponent(cursorPos);
81 final Cursor cursor;
82 final Object peer = LWToolkit.targetToPeer(c);
83 if (peer instanceof LWComponentPeer) {
84 final LWComponentPeer<?, ?> lwpeer = (LWComponentPeer<?, ?>) peer;
85 final Point p = lwpeer.getLocationOnScreen();
86 cursor = lwpeer.getCursor(new Point(cursorPos.x - p.x,
87 cursorPos.y - p.y));
88 } else {
89 cursor = (c != null) ? c.getCursor() : null;
90 }
91 // TODO: default cursor for modal blocked windows
92 setCursor(cursor);
93 }
94
95 /**
96 * Returns the first visible, enabled and showing component under cursor.
97 *
98 * @param cursorPos Current cursor position.
99 * @return Component
100 */
101 private static final Component findComponent(final Point cursorPos) {
102 final LWComponentPeer<?, ?> peer = LWWindowPeer.getPeerUnderCursor();
103 Component c = null;
104 if (peer != null) {
105 c = peer.getTarget();
106 if (c instanceof Container) {
107 final Point p = peer.getLocationOnScreen();
108 c = ((Container) c).findComponentAt(cursorPos.x - p.x,
109 cursorPos.y - p.y);
110 }
111 while (c != null) {
112 if (c.isVisible() && c.isEnabled() && (c.getPeer() != null)) {
113 break;
114 }
115 c = c.getParent();
116 }
117 }
118 return c;
119 }
120
121 /**
122 * Returns the current cursor position.
123 */
124 // TODO: make it public to reuse for MouseInfo
125 protected abstract Point getCursorPosition();
126
127 /**
128 * Sets a cursor. The cursor can be null if the mouse is not over a Java
129 * window.
130 * @param cursor the new {@code Cursor}.
131 */
132 protected abstract void setCursor(Cursor cursor);
133 }
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