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This class is a placeholder for all internal static objects that represent system state. We keep our representation up-to-date with actual system state by tracking events, such as X Focus, Component under cursor etc. All attributes should be private static with accessors to simpify change tracking.
/** * This class is a placeholder for all internal static objects that represent * system state. We keep our representation up-to-date with actual system * state by tracking events, such as X Focus, Component under cursor etc. * All attributes should be private static with accessors to simpify change * tracking. */
package sun.awt.X11; import java.awt.Component; import java.lang.ref.WeakReference; class XAwtState {
The mouse is over this component. If the component is not disabled, it received MOUSE_ENTERED but no MOUSE_EXITED.
/** * The mouse is over this component. * If the component is not disabled, it received MOUSE_ENTERED but no MOUSE_EXITED. */
private static WeakReference<Component> componentMouseEnteredRef = null; static void setComponentMouseEntered(Component component) { XToolkit.awtLock(); try { if (component == null) { componentMouseEnteredRef = null; return; } if (component != getComponentMouseEntered()) { componentMouseEnteredRef = new WeakReference<>(component); } } finally { XToolkit.awtUnlock(); } } static Component getComponentMouseEntered() { XToolkit.awtLock(); try { if (componentMouseEnteredRef == null) { return null; } return componentMouseEnteredRef.get(); } finally { XToolkit.awtUnlock(); } }
The XBaseWindow is created with OwnerGrabButtonMask (see X vol. 1, 8.3.3.2) so inside the app Key, Motion, and Button events are received by the window they actualy happened on, not the grabber. Then XBaseWindow dispatches them to the grabber. As a result XAnyEvent.get_window() returns actual window the event is originated, though the event is dispatched by the grabber.
/** * The XBaseWindow is created with OwnerGrabButtonMask * (see X vol. 1, 8.3.3.2) so inside the app Key, Motion, and Button events * are received by the window they actualy happened on, not the grabber. * Then XBaseWindow dispatches them to the grabber. As a result * XAnyEvent.get_window() returns actual window the event is originated, * though the event is dispatched by the grabber. */
private static boolean inManualGrab = false; static boolean isManualGrab() { return inManualGrab; } private static WeakReference<XBaseWindow> grabWindowRef = null;
The X Active Grab overrides any other active grab by the same client see XGrabPointer, XGrabKeyboard
/** * The X Active Grab overrides any other active grab by the same * client see XGrabPointer, XGrabKeyboard */
static void setGrabWindow(XBaseWindow grabWindow) { setGrabWindow(grabWindow, false); }
Automatic passive grab doesn't override active grab see XGrabButton
/** * Automatic passive grab doesn't override active grab see XGrabButton */
static void setAutoGrabWindow(XBaseWindow grabWindow) { setGrabWindow(grabWindow, true); } private static void setGrabWindow(XBaseWindow grabWindow, boolean isAutoGrab) { XToolkit.awtLock(); try { if (inManualGrab && isAutoGrab) { return; } inManualGrab = grabWindow != null && !isAutoGrab; if (grabWindow == null) { grabWindowRef = null; return; } if (grabWindow != getGrabWindow()) { grabWindowRef = new WeakReference<>(grabWindow); } } finally { XToolkit.awtUnlock(); } } static XBaseWindow getGrabWindow() { XToolkit.awtLock(); try { if (grabWindowRef == null) { return null; } XBaseWindow xbw = grabWindowRef.get(); if( xbw != null && xbw.isDisposed() ) { xbw = null; grabWindowRef = null; }else if( xbw == null ) { grabWindowRef = null; } return xbw; } finally { XToolkit.awtUnlock(); } } }