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/*******************************************************************************
* Copyright (c) 2000, 2017 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.events;
import java.util.function.*;
import org.eclipse.swt.internal.*;
/**
* Classes which implement this interface provide methods
* that deal with the events that are generated as the mouse
* pointer passes (or hovers) over controls.
* <p>
* After creating an instance of a class that implements
* this interface it can be added to a control using the
* <code>addMouseTrackListener</code> method and removed using
* the <code>removeMouseTrackListener</code> method. When the
* mouse pointer passes into or out of the area of the screen
* covered by a control or pauses while over a control, the
* appropriate method will be invoked.
* </p>
*
* @see MouseTrackAdapter
* @see MouseEvent
*/
public interface MouseTrackListener extends SWTEventListener {
/**
* Sent when the mouse pointer passes into the area of
* the screen covered by a control.
*
* @param e an event containing information about the mouse enter
*/
void mouseEnter(MouseEvent e);
/**
* Sent when the mouse pointer passes out of the area of
* the screen covered by a control.
*
* @param e an event containing information about the mouse exit
*/
void mouseExit(MouseEvent e);
/**
* Sent when the mouse pointer hovers (that is, stops moving
* for an (operating system specified) period of time) over
* a control.
*
* @param e an event containing information about the hover
*/
void mouseHover(MouseEvent e);
/**
* Static helper method to create a <code>MouseTrackListener</code> for the
* {@link #mouseEnter(MouseEvent e)}) method, given a lambda expression or a method reference.
*
* @param c the consumer of the event
* @return MouseTrackListener
* @since 3.107
*/
static MouseTrackListener mouseEnterAdapter(Consumer<MouseEvent> c) {
return new MouseTrackAdapter() {
@Override
public void mouseEnter(MouseEvent e) {
c.accept(e);
}
};
}
/**
* Static helper method to create a <code>MouseTrackListener</code> for the
* {@link #mouseExit(MouseEvent e)}) method, given a lambda expression or a method reference.
*
* @param c the consumer of the event
* @return MouseTrackListener
* @since 3.107
*/
static MouseTrackListener mouseExitAdapter(Consumer<MouseEvent> c) {
return new MouseTrackAdapter() {
@Override
public void mouseExit(MouseEvent e) {
c.accept(e);
}
};
}
/**
* Static helper method to create a <code>MouseTrackListener</code> for the
* {@link #mouseHover(MouseEvent e)}) method, given a lambda expression or a method reference.
*
* @param c the consumer of the event
* @return MouseTrackListener
* @since 3.107
*/
static MouseTrackListener mouseHoverAdapter(Consumer<MouseEvent> c) {
return new MouseTrackAdapter() {
@Override
public void mouseHover(MouseEvent e) {
c.accept(e);
}
};
}
}
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