/**
* Handles a scroll event by passing it on to the registered handlers.
*
* @param e the scroll event.
*/
protected void handleScroll(ScrollEvent e) {
if (this.liveHandler != null && this.liveHandler.isEnabled()) {
this.liveHandler.handleScroll(this, e);
}
for (MouseHandlerFX handler : this.auxiliaryMouseHandlers) {
if (handler.isEnabled()) {
handler.handleScroll(this, e);
}
}
}
/**
* Handles a mouse moved event by passing it on to the registered handlers.
*
* @param e the mouse event.
*/
private void handleMouseMoved(MouseEvent e) {
if (this.liveHandler != null && this.liveHandler.isEnabled()) {
this.liveHandler.handleMouseMoved(this, e);
}
for (MouseHandlerFX handler : this.auxiliaryMouseHandlers) {
if (handler.isEnabled()) {
handler.handleMouseMoved(this, e);
}
}
}
/**
* Handles a mouse released event by passing it on to the registered handlers.
*
* @param e the mouse event.
*/
private void handleMouseClicked(MouseEvent e) {
if (this.liveHandler != null && this.liveHandler.isEnabled()) {
this.liveHandler.handleMouseClicked(this, e);
}
// pass on the event to the auxiliary handlers
for (MouseHandlerFX handler : this.auxiliaryMouseHandlers) {
if (handler.isEnabled()) {
handler.handleMouseClicked(this, e);
}
}
}
/**
* Returns the mouse handler with the specified ID, or {@code null} if there is no handler with
* that ID. This method will look for handlers in both the regular and auxiliary handler lists.
*
* @param id the ID ({@code null} not permitted).
* @return The handler with the specified ID
*/
public MouseHandlerFX getMouseHandler(String id) {
for (MouseHandlerFX h : this.availableMouseHandlers) {
if (h.getID().equals(id)) {
return h;
}
}
for (MouseHandlerFX h : this.auxiliaryMouseHandlers) {
if (h.getID().equals(id)) {
return h;
}
}
return null;
}
/**
* Adds a mouse handler to the list of available handlers (handlers that are candidates to take
* the position of live handler). The handler must have an ID that uniquely identifies it amongst
* the handlers registered with this canvas.
*
* @param handler the handler ({@code null} not permitted).
*/
public void addMouseHandler(MouseHandlerFX handler) {
if (!this.hasUniqueID(handler)) {
throw new IllegalArgumentException(
"There is already a handler with that ID (" + handler.getID() + ").");
}
this.availableMouseHandlers.add(handler);
}
/**
* Validates that the specified handler has an ID that uniquely identifies it amongst the existing
* handlers for this canvas.
*
* @param handler the handler ({@code null} not permitted).
* @return A boolean.
*/
private boolean hasUniqueID(MouseHandlerFX handler) {
for (MouseHandlerFX h : this.availableMouseHandlers) {
if (handler.getID().equals(h.getID())) {
return false;
}
}
for (MouseHandlerFX h : this.auxiliaryMouseHandlers) {
if (handler.getID().equals(h.getID())) {
return false;
}
}
return true;
}
/**
* Handles a mouse pressed event by (1) selecting a live handler if one is not already selected,
* (2) passing the event to the live handler if there is one, and (3) passing the event to all
* enabled auxiliary handlers.
*
* @param e the mouse event.
*/
private void handleMousePressed(MouseEvent e) {
if (this.liveHandler == null) {
for (MouseHandlerFX handler : this.availableMouseHandlers) {
if (handler.isEnabled() && handler.hasMatchingModifiers(e)) {
this.liveHandler = handler;
}
}
}
if (this.liveHandler != null) {
this.liveHandler.handleMousePressed(this, e);
}
// pass on the event to the auxiliary handlers
for (MouseHandlerFX handler : this.auxiliaryMouseHandlers) {
if (handler.isEnabled()) {
handler.handleMousePressed(this, e);
}
}
}
