/**
* Enables the receiver if the argument is <code>true</code>, and disables it otherwise.
*
* <p>A disabled control is typically not selectable from the user interface and draws with an
* inactive or "grayed" look.
*
* @param enabled the new enabled state
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
* </ul>
*/
public void setEnabled(boolean enabled) {
checkWidget();
long /*int*/ topHandle = topHandle();
if (OS.GTK_WIDGET_SENSITIVE(topHandle) == enabled) return;
OS.gtk_widget_set_sensitive(topHandle, enabled);
if (enabled) {
/*
* Bug in GTK. GtkButton requires an enter notify before it
* allows the button to be pressed, but events are dropped when
* widgets are insensitive. The fix is to hide and show the
* button if the pointer is within its bounds.
*/
int[] x = new int[1], y = new int[1];
OS.gdk_window_get_pointer(parent.paintWindow(), x, y, null);
if (getBounds().contains(x[0], y[0])) {
OS.gtk_widget_hide(handle);
OS.gtk_widget_show(handle);
}
} else {
/*
* Bug in GTK. Starting with 2.14, if a button is disabled
* through on a button press, the field which keeps track
* whether the pointer is currently in the button is never updated.
* As a result, when it is re-enabled it automatically enters
* a PRELIGHT state. The fix is to set a NORMAL state.
*/
if (OS.GTK_VERSION >= OS.VERSION(2, 14, 0)) {
OS.gtk_widget_set_state(topHandle, OS.GTK_STATE_NORMAL);
}
}
}
