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/**
* Copyright (c) 2014, 2015 ControlsFX
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of ControlsFX, any associated website, nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL CONTROLSFX BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.controlsfx.control.textfield;
import com.sun.javafx.event.EventHandlerManager;
import impl.org.controlsfx.skin.AutoCompletePopup;
import impl.org.controlsfx.skin.AutoCompletePopupSkin;
import javafx.application.Platform;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.ObjectPropertyBase;
import javafx.concurrent.Task;
import javafx.event.*;
import javafx.scene.Node;
import javafx.scene.control.ListView;
import javafx.scene.control.Skin;
import javafx.util.Callback;
import javafx.util.StringConverter;
import java.util.Collection;
import javafx.beans.property.IntegerProperty;
/**
* The AutoCompletionBinding is the abstract base class of all auto-completion bindings.
* This class is the core logic for the auto-completion feature but highly customizable.
*
* To use the autocompletion functionality, refer to the {@link TextFields} class.
*
* @param Model-Type of the suggestions
* @see TextFields
*/
public abstract class AutoCompletionBinding implements EventTarget {
/***************************************************************************
* *
* Private fields *
* *
**************************************************************************/
private static final long AUTO_COMPLETE_DELAY = 250;
private final Node completionTarget;
private final AutoCompletePopup autoCompletionPopup;
private final Object suggestionsTaskLock = new Object();
private FetchSuggestionsTask suggestionsTask = null;
private Callback> suggestionProvider = null;
private boolean ignoreInputChanges = false;
/***************************************************************************
* *
* Constructors *
* *
**************************************************************************/
/**
* Creates a new AutoCompletionBinding
*
* @param completionTarget The target node to which auto-completion shall be added
* @param suggestionProvider The strategy to retrieve suggestions
* @param converter The converter to be used to convert suggestions to strings
*/
protected AutoCompletionBinding(Node completionTarget,
Callback> suggestionProvider,
StringConverter converter){
this.completionTarget = completionTarget;
this.suggestionProvider = suggestionProvider;
this.autoCompletionPopup = new AutoCompletePopup<>();
this.autoCompletionPopup.setConverter(converter);
autoCompletionPopup.setOnSuggestion(sce -> {
try{
setIgnoreInputChanges(true);
completeUserInput(sce.getSuggestion());
fireAutoCompletion(sce.getSuggestion());
hidePopup();
}finally{
// Ensure that ignore is always set back to false
setIgnoreInputChanges(false);
}
});
}
/***************************************************************************
* *
* Public API *
* *
**************************************************************************/
/**
* Specifies whether the PopupWindow should be hidden when an unhandled
* escape key is pressed while the popup has focus.
*
* @param value
*/
public void setHideOnEscape(boolean value) {
autoCompletionPopup.setHideOnEscape(value);
}
/**
* Set the current text the user has entered
* @param userText
*/
public final void setUserInput(String userText){
if(!isIgnoreInputChanges()){
onUserInputChanged(userText);
}
}
/**
* Gets the target node for auto completion
* @return the target node for auto completion
*/
public Node getCompletionTarget(){
return completionTarget;
}
/**
* Disposes the binding.
*/
public abstract void dispose();
/**
* Set the maximum number of rows to be visible in the popup when it is
* showing.
*
* @param value
*/
public final void setVisibleRowCount(int value) {
autoCompletionPopup.setVisibleRowCount(value);
}
/**
* Return the maximum number of rows to be visible in the popup when it is
* showing.
*
* @return the maximum number of rows to be visible in the popup when it is
* showing.
*/
public final int getVisibleRowCount() {
return autoCompletionPopup.getVisibleRowCount();
}
/**
* Return an property representing the maximum number of rows to be visible
* in the popup when it is showing.
*
* @return an property representing the maximum number of rows to be visible
* in the popup when it is showing.
*/
public final IntegerProperty visibleRowCountProperty() {
return autoCompletionPopup.visibleRowCountProperty();
}
/***************************************************************************
* *
* Protected methods *
* *
**************************************************************************/
/**
* Complete the current user-input with the provided completion.
* Sub-classes have to provide a concrete implementation.
* @param completion
*/
protected abstract void completeUserInput(T completion);
/**
* Show the auto completion popup
*/
protected void showPopup(){
autoCompletionPopup.show(completionTarget);
selectFirstSuggestion(autoCompletionPopup);
}
/**
* Hide the auto completion targets
*/
protected void hidePopup(){
autoCompletionPopup.hide();
}
protected void fireAutoCompletion(T completion){
Event.fireEvent(this, new AutoCompletionEvent<>(completion));
}
/***************************************************************************
* *
* Private methods *
* *
**************************************************************************/
/**
* Selects the first suggestion (if any), so the user can choose it
* by pressing enter immediately.
*/
private void selectFirstSuggestion(AutoCompletePopup autoCompletionPopup){
Skin skin = autoCompletionPopup.getSkin();
if(skin instanceof AutoCompletePopupSkin){
AutoCompletePopupSkin au = (AutoCompletePopupSkin)skin;
ListView li = (ListView)au.getNode();
if(li.getItems() != null && !li.getItems().isEmpty()){
li.getSelectionModel().select(0);
}
}
}
/**
* Occurs when the user text has changed and the suggestions require an update
* @param userText
*/
private final void onUserInputChanged(final String userText){
synchronized (suggestionsTaskLock) {
if(suggestionsTask != null && suggestionsTask.isRunning()){
// cancel the current running task
suggestionsTask.cancel();
}
// create a new fetcher task
suggestionsTask = new FetchSuggestionsTask(userText);
new Thread(suggestionsTask).start();
}
}
/**
* Shall changes to the user input be ignored?
* @return
*/
private boolean isIgnoreInputChanges(){
return ignoreInputChanges;
}
/**
* If IgnoreInputChanges is set to true, all changes to the user input are
* ignored. This is primary used to avoid self triggering while
* auto completing.
* @param state
*/
private void setIgnoreInputChanges(boolean state){
ignoreInputChanges = state;
}
/***************************************************************************
* *
* Inner classes and interfaces *
* *
**************************************************************************/
/**
* Represents a suggestion fetch request
*
*/
public static interface ISuggestionRequest {
/**
* Is this request canceled?
* @return {@code true} if the request is canceled, otherwise {@code false}
*/
public boolean isCancelled();
/**
* Get the user text to which suggestions shall be found
* @return {@link String} containing the user text
*/
public String getUserText();
}
/**
* This task is responsible to fetch suggestions asynchronous
* by using the current defined suggestionProvider
*
*/
private class FetchSuggestionsTask extends Task implements ISuggestionRequest {
private final String userText;
public FetchSuggestionsTask(String userText){
this.userText = userText;
}
@Override
protected Void call() throws Exception {
Callback> provider = suggestionProvider;
if(provider != null){
long start_time = System.currentTimeMillis();
final Collection fetchedSuggestions = provider.call(this);
long sleep_time = start_time + AUTO_COMPLETE_DELAY - System.currentTimeMillis();
if (sleep_time > 0 && !isCancelled()) {
Thread.sleep(sleep_time);
}
if(!isCancelled()){
Platform.runLater(() -> {
if(fetchedSuggestions != null && !fetchedSuggestions.isEmpty()){
autoCompletionPopup.getSuggestions().setAll(fetchedSuggestions);
showPopup();
}else{
// No suggestions found, so hide the popup
hidePopup();
}
});
}
}else {
// No suggestion provider
hidePopup();
}
return null;
}
@Override
public String getUserText() {
return userText;
}
}
/***************************************************************************
* *
* Events *
* *
**************************************************************************/
// --- AutoCompletionEvent
/**
* Represents an Event which is fired after an auto completion.
*/
@SuppressWarnings("serial")
public static class AutoCompletionEvent extends Event {
/**
* The event type that should be listened to by people interested in
* knowing when an auto completion has been performed.
*/
@SuppressWarnings("rawtypes")
public static final EventType AUTO_COMPLETED = new EventType<>("AUTO_COMPLETED"); //$NON-NLS-1$
private final TE completion;
/**
* Creates a new event that can subsequently be fired.
*/
public AutoCompletionEvent(TE completion) {
super(AUTO_COMPLETED);
this.completion = completion;
}
/**
* Returns the chosen completion.
*/
public TE getCompletion() {
return completion;
}
}
private ObjectProperty>> onAutoCompleted;
/**
* Set a event handler which is invoked after an auto completion.
* @param value
*/
public final void setOnAutoCompleted(EventHandler> value) {
onAutoCompletedProperty().set( value);
}
public final EventHandler> getOnAutoCompleted() {
return onAutoCompleted == null ? null : onAutoCompleted.get();
}
public final ObjectProperty>> onAutoCompletedProperty() {
if (onAutoCompleted == null) {
onAutoCompleted = new ObjectPropertyBase>>() {
@SuppressWarnings({ "rawtypes", "unchecked" })
@Override protected void invalidated() {
eventHandlerManager.setEventHandler(
AutoCompletionEvent.AUTO_COMPLETED,
(EventHandler)(Object)get());
}
@Override
public Object getBean() {
return AutoCompletionBinding.this;
}
@Override
public String getName() {
return "onAutoCompleted"; //$NON-NLS-1$
}
};
}
return onAutoCompleted;
}
/***************************************************************************
* *
* EventTarget Implementation *
* *
**************************************************************************/
final EventHandlerManager eventHandlerManager = new EventHandlerManager(this);
/**
* Registers an event handler to this EventTarget. The handler is called when the
* menu item receives an {@code Event} of the specified type during the bubbling
* phase of event delivery.
*
* @param the specific event class of the handler
* @param eventType the type of the events to receive by the handler
* @param eventHandler the handler to register
* @throws NullPointerException if the event type or handler is null
*/
public void addEventHandler(EventType eventType, EventHandler eventHandler) {
eventHandlerManager.addEventHandler(eventType, eventHandler);
}
/**
* Unregisters a previously registered event handler from this EventTarget. One
* handler might have been registered for different event types, so the
* caller needs to specify the particular event type from which to
* unregister the handler.
*
* @param the specific event class of the handler
* @param eventType the event type from which to unregister
* @param eventHandler the handler to unregister
* @throws NullPointerException if the event type or handler is null
*/
public void removeEventHandler(EventType eventType, EventHandler eventHandler) {
eventHandlerManager.removeEventHandler(eventType, eventHandler);
}
/** {@inheritDoc} */
@Override public EventDispatchChain buildEventDispatchChain(EventDispatchChain tail) {
return tail.prepend(eventHandlerManager);
}
}