javafx.scene.control.Dialog Maven / Gradle / Ivy
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package javafx.scene.control;
import java.lang.ref.WeakReference;
import java.util.Optional;
import javafx.beans.InvalidationListener;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.ReadOnlyBooleanProperty;
import javafx.beans.property.ReadOnlyDoubleProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.beans.property.StringProperty;
import javafx.collections.ListChangeListener;
import javafx.css.PseudoClass;
import javafx.event.Event;
import javafx.event.EventDispatchChain;
import javafx.event.EventHandler;
import javafx.event.EventTarget;
import javafx.scene.Node;
import javafx.scene.control.ButtonBar.ButtonData;
import javafx.stage.Modality;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
import javafx.stage.Window;
import javafx.util.Callback;
import com.sun.javafx.event.EventHandlerManager;
import com.sun.javafx.tk.Toolkit;
/**
* A Dialog in JavaFX wraps a {@link DialogPane} and provides the necessary API
* to present it to end users. In JavaFX 8u40, this essentially means that the
* {@link DialogPane} is shown to users inside a {@link Stage}, but future releases
* may offer alternative options (such as 'lightweight' or 'internal' dialogs).
* This API therefore is intentionally ignorant of the underlying implementation,
* and attempts to present a common API for all possible implementations.
*
* The Dialog class has a single generic type, R, which is used to represent
* the type of the {@link #resultProperty() result} property (and also, how to
* convert from {@link ButtonType} to R, through the use of the
* {@link #resultConverterProperty() result converter} {@link Callback}).
*
*
Critical note: It is critical that all developers who choose
* to create their own dialogs by extending the Dialog class understand the
* importance of the {@link #resultConverterProperty() result converter} property.
* A result converter must always be set, whenever the R type is not
* {@link Void} or {@link ButtonType}. If this is not heeded, developers will find
* that they get ClassCastExceptions in their code, for failure to convert from
* {@link ButtonType} via the {@link #resultConverterProperty() result converter}.
*
*
It is likely that most developers would be better served using either the
* {@link Alert} class (for pre-defined, notification-style alerts), or either of
* the two pre-built dialogs ({@link TextInputDialog} and {@link ChoiceDialog}),
* depending on their needs.
*
*
Once a Dialog is instantiated, the next step is to configure it. Almost
* all properties on Dialog are not related to the content of the Dialog, the
* only exceptions are {@link #contentTextProperty()},
* {@link #headerTextProperty()}, and {@link #graphicProperty()}, and these
* properties are simply forwarding API onto the respective properties on the
* {@link DialogPane} stored in the {@link #dialogPaneProperty() dialog pane}
* property. These three properties are forwarded from DialogPane for developer
* convenience. For developers wanting to configure their dialog, they will in many
* cases be required to use code along the lines of
* {@code dialog.getDialogPane().setExpandableContent(node)}.
*
*
After configuring these properties, all that remains is to consider whether
* the buttons (created using {@link ButtonType} and the
* {@link DialogPane#createButton(ButtonType)} method) are fully configured.
* Developers will quickly find that the amount of configurability offered
* via the {@link ButtonType} class is minimal. This is intentional, but does not
* mean that developers can not modify the buttons created by the {@link ButtonType}
* that have been specified. To do this, developers simply call the
* {@link DialogPane#lookupButton(ButtonType)} method with the ButtonType
* (assuming it has already been set in the {@link DialogPane#getButtonTypes()}
* list. The returned Node is typically of type {@link Button}, but this depends
* on if the {@link DialogPane#createButton(ButtonType)} method has been overridden. A
* typical approach is therefore along the following lines:
*
*
{@code ButtonType loginButtonType = new ButtonType("Login", ButtonData.OK_DONE);
* Dialog dialog = new Dialog<>();
* dialog.setTitle("Login Dialog");
* dialog.setContentText("Would you like to log in?");
* dialog.getDialogPane().getButtonTypes().add(loginButtonType);
* boolean disabled = false; // computed based on content of text fields, for example
* dialog.getDialogPane().lookupButton(loginButtonType).setDisable(disabled);
* dialog.showAndWait();}
*
* 
*
* Once a Dialog is instantiated and fully configured, the next step is to
* show it. More often than not, dialogs are shown in a modal and blocking
* fashion. 'Modal' means that the dialog prevents user interaction with the
* owning application whilst it is showing, and 'blocking' means that code
* execution stops at the point in which the dialog is shown. This means that
* you can show a dialog, await the user response, and then continue running the
* code that directly follows the show call, giving developers the ability to
* immediately deal with the user input from the dialog (if relevant).
*
*
JavaFX dialogs are modal by default (you can change this via the
* {@link #initModality(javafx.stage.Modality)} API). To specify whether you want
* blocking or non-blocking dialogs, developers simply choose to call
* {@link #showAndWait()} or {@link #show()} (respectively). By default most
* developers should choose to use {@link #showAndWait()}, given the ease of
* coding in these situations. Shown below is three code snippets, showing three
* equally valid ways of showing a dialog:
*
*
Option 1: The 'traditional' approach
*
{@code Optional result = dialog.showAndWait();
* if (result.isPresent() && result.get() == ButtonType.OK) {
* formatSystem();
* }}
*
* Option 2: The traditional + Optional approach
*
{@code dialog.showAndWait().ifPresent(response -> {
* if (response == ButtonType.OK) {
* formatSystem();
* }
* });}
*
* Option 3: The fully lambda approach
*
{@code dialog.showAndWait()
* .filter(response -> response == ButtonType.OK)
* .ifPresent(response -> formatSystem());}
*
* There is no better or worse option of the three listed above, so developers
* are encouraged to work to their own style preferences. The purpose of showing
* the above is to help introduce developers to the {@link Optional} API, which
* is new in Java 8 and may be foreign to many developers.
*
*
Dialog Validation / Intercepting Button Actions
*
* In some circumstances it is desirable to prevent a dialog from closing
* until some aspect of the dialog becomes internally consistent (e.g. a form
* inside the dialog has all fields in a valid state). To do this, users of the
* dialogs API should become familiar with the
* {@link DialogPane#lookupButton(ButtonType)} method. By passing in a
* {@link javafx.scene.control.ButtonType ButtonType} (that has already been set
* in the {@link DialogPane#getButtonTypes() button types} list), users will be
* returned a Node that is typically of type {@link Button} (but this depends
* on if the {@link DialogPane#createButton(ButtonType)} method has been
* overridden). With this button, users may add an event filter that is called
* before the button does its usual event handling, and as such users may
* prevent the event handling by {@code consuming} the event. Here's a simplified
* example:
*
*
{@code final Button btOk = (Button) dlg.getDialogPane().lookupButton(ButtonType.OK);
* btOk.addEventFilter(ActionEvent.ACTION, event -> {
* if (!validateAndStore()) {
* event.consume();
* }
* });}
*
* Dialog Closing Rules
*
* It is important to understand what happens when a Dialog is closed, and
* also how a Dialog can be closed, especially in abnormal closing situations
* (such as when the 'X' button is clicked in a dialogs title bar, or when
* operating system specific keyboard shortcuts (such as alt-F4 on Windows)
* are entered). Fortunately, the outcome is well-defined in these situations,
* and can be best summarised in the following bullet points:
*
*
* - JavaFX dialogs can only be closed 'abnormally' (as defined above) in
* two situations:
*
* - When the dialog only has one button, or
*
- When the dialog has multiple buttons, as long as one of them meets
* one of the following requirements:
*
* - The button has a {@link ButtonType} whose {@link ButtonData} is of type
* {@link ButtonData#CANCEL_CLOSE}.
* - The button has a {@link ButtonType} whose {@link ButtonData} returns true
* when {@link ButtonData#isCancelButton()} is called.
*
*
* - In all other situations, the dialog will refuse to respond to all
* close requests, remaining open until the user clicks on one of the available
* buttons in the {@link DialogPane} area of the dialog.
*
- If a dialog is closed abnormally, and if the dialog contains a button
* which meets one of the two criteria above, the dialog will attempt to set
* the {@link #resultProperty() result} property to whatever value is returned
* from calling the {@link #resultConverterProperty() result converter} with
* the first matching {@link ButtonType}.
*
- If for any reason the result converter returns null, or if the dialog
* is closed when only one non-cancel button is present, the
* {@link #resultProperty() result} property will be null, and the
* {@link #showAndWait()} method will return {@link Optional#empty()}. This
* later point means that, if you use either of option 2 or option 3 (as
* presented earlier in this class documentation), the
* {@link Optional#ifPresent(java.util.function.Consumer)} lambda will never
* be called, and code will continue executing as if the dialog had not
* returned any value at all.
*
*
* @param The return type of the dialog, via the
* {@link #resultProperty() result} property.
* @see Alert
* @see TextInputDialog
* @see ChoiceDialog
* @since JavaFX 8u40
*/
public class Dialog implements EventTarget {
/* ************************************************************************
*
* Static fields
*
**************************************************************************/
/* ************************************************************************
*
* Static methods
*
**************************************************************************/
/* ************************************************************************
*
* Private fields
*
**************************************************************************/
final FXDialog dialog;
private boolean isClosing;
/* ************************************************************************
*
* Constructors
*
**************************************************************************/
/**
* Creates a dialog without a specified owner.
*/
public Dialog() {
this.dialog = new HeavyweightDialog(this);
setDialogPane(new DialogPane());
initModality(Modality.APPLICATION_MODAL);
}
/* ************************************************************************
*
* Abstract methods
*
**************************************************************************/
/* ************************************************************************
*
* Public API
*
**************************************************************************/
/**
* Shows the dialog but does not wait for a user response (in other words,
* this brings up a non-blocking dialog). Users of this API must either
* poll the {@link #resultProperty() result property}, or else add a listener
* to the result property to be informed of when it is set.
* @throws IllegalStateException if this method is called on a thread
* other than the JavaFX Application Thread.
*/
public final void show() {
Toolkit.getToolkit().checkFxUserThread();
Event.fireEvent(this, new DialogEvent(this, DialogEvent.DIALOG_SHOWING));
if (Double.isNaN(getWidth()) && Double.isNaN(getHeight())) {
dialog.sizeToScene();
}
dialog.show();
Event.fireEvent(this, new DialogEvent(this, DialogEvent.DIALOG_SHOWN));
}
/**
* Shows the dialog and waits for the user response (in other words, brings
* up a blocking dialog, with the returned value the users input).
*
* This method must be called on the JavaFX Application thread.
* Additionally, it must either be called from an input event handler or
* from the run method of a Runnable passed to
* {@link javafx.application.Platform#runLater Platform.runLater}.
* It must not be called during animation or layout processing.
*
*
* @return An {@link Optional} that contains the {@link #resultProperty() result}.
* Refer to the {@link Dialog} class documentation for more detail.
* @throws IllegalStateException if this method is called on a thread
* other than the JavaFX Application Thread.
* @throws IllegalStateException if this method is called during
* animation or layout processing.
*/
public final Optional showAndWait() {
Toolkit.getToolkit().checkFxUserThread();
if (!Toolkit.getToolkit().canStartNestedEventLoop()) {
throw new IllegalStateException("showAndWait is not allowed during animation or layout processing");
}
Event.fireEvent(this, new DialogEvent(this, DialogEvent.DIALOG_SHOWING));
if (Double.isNaN(getWidth()) && Double.isNaN(getHeight())) {
dialog.sizeToScene();
}
// this is slightly odd - we fire the SHOWN event before the show()
// call, so that users get the event before the dialog blocks
Event.fireEvent(this, new DialogEvent(this, DialogEvent.DIALOG_SHOWN));
dialog.showAndWait();
return Optional.ofNullable(getResult());
}
/**
* Closes this {@code Dialog}.
* This call is equivalent to {@link #hide}.
*/
public final void close() {
if (isClosing) return;
isClosing = true;
final R result = getResult();
// if the result is null and we do not have permission to close the
// dialog, then we cancel the close request before any events are
// even fired
if (result == null && ! dialog.requestPermissionToClose(this)) {
isClosing = false;
return;
}
// if we are here we have permission to close the dialog. However, we
// may not have a result set to return to the user. Therefore, we need
// to handle that before the dialog closes (especially in case the
// dialog is blocking, in which case having a null result is really going
// to mess up users).
//
// In cases where the result is null, and where the dialog has a cancel
// button, we call into the result converter to see what to do. This is
// used primarily to handle the requirement that the X button has the
// same result as clicking the cancel button.
//
// A 'cancel button' can mean two different things (although they may
// be the same thing):
// 1) A button whose ButtonData is of type CANCEL_CLOSE.
// 2) A button whose ButtonData returns true for isCancelButton().
if (result == null) {
ButtonType cancelButton = null;
// we do two things here. We are primarily looking for a button with
// ButtonData.CANCEL_CLOSE. If we find one, we use it as the result.
// However, if we don't find one, we can also use any button that
// is a cancel button.
for (ButtonType button : getDialogPane().getButtonTypes()) {
ButtonData buttonData = button.getButtonData();
if (buttonData == null) continue;
if (buttonData == ButtonData.CANCEL_CLOSE) {
cancelButton = button;
break;
}
if (buttonData.isCancelButton()) {
cancelButton = button;
}
}
setResultAndClose(cancelButton, false);
}
// start normal closing process
Event.fireEvent(this, new DialogEvent(this, DialogEvent.DIALOG_HIDING));
DialogEvent closeRequestEvent = new DialogEvent(this, DialogEvent.DIALOG_CLOSE_REQUEST);
Event.fireEvent(this, closeRequestEvent);
if (closeRequestEvent.isConsumed()) {
isClosing = false;
return;
}
dialog.close();
Event.fireEvent(this, new DialogEvent(this, DialogEvent.DIALOG_HIDDEN));
isClosing = false;
}
/**
* Hides this {@code Dialog}.
*/
public final void hide() {
close();
}
/**
* Specifies the modality for this dialog. This must be done prior to making
* the dialog visible. The modality is one of: Modality.NONE,
* Modality.WINDOW_MODAL, or Modality.APPLICATION_MODAL.
*
* @param modality the modality for this dialog.
*
* @throws IllegalStateException if this property is set after the dialog
* has ever been made visible.
*
* @defaultValue Modality.APPLICATION_MODAL
*/
public final void initModality(Modality modality) {
dialog.initModality(modality);
}
/**
* Retrieves the modality attribute for this dialog.
*
* @return the modality.
*/
public final Modality getModality() {
return dialog.getModality();
}
/**
* Specifies the style for this dialog. This must be done prior to making
* the dialog visible. The style is one of: StageStyle.DECORATED,
* StageStyle.UNDECORATED, StageStyle.TRANSPARENT, StageStyle.UTILITY,
* or StageStyle.UNIFIED.
*
* @param style the style for this dialog.
*
* @throws IllegalStateException if this property is set after the dialog
* has ever been made visible.
*
* @defaultValue StageStyle.DECORATED
*/
public final void initStyle(StageStyle style) {
dialog.initStyle(style);
}
/**
* Specifies the owner {@link Window} for this dialog, or null for a top-level,
* unowned dialog. This must be done prior to making the dialog visible.
*
* @param window the owner {@link Window} for this dialog.
*
* @throws IllegalStateException if this property is set after the dialog
* has ever been made visible.
*
* @defaultValue null
*/
public final void initOwner(Window window) {
dialog.initOwner(window);
}
/**
* Retrieves the owner Window for this dialog, or null for an unowned dialog.
*
* @return the owner Window.
*/
public final Window getOwner() {
return dialog.getOwner();
}
/* ************************************************************************
*
* Properties
*
**************************************************************************/
// --- dialog Pane
/**
* The root node of the dialog, the {@link DialogPane} contains all visual
* elements shown in the dialog. As such, it is possible to completely adjust
* the display of the dialog by modifying the existing dialog pane or creating
* a new one.
*/
private ObjectProperty dialogPane = new SimpleObjectProperty(this, "dialogPane", new DialogPane()) {
final InvalidationListener expandedListener = o -> {
DialogPane dialogPane = getDialogPane();
if (dialogPane == null) return;
final Node content = dialogPane.getExpandableContent();
final boolean isExpanded = content == null ? false : content.isVisible();
setResizable(isExpanded);
Dialog.this.dialog.sizeToScene();
};
final InvalidationListener headerListener = o -> {
updatePseudoClassState();
};
WeakReference dialogPaneRef = new WeakReference<>(null);
@Override
protected void invalidated() {
DialogPane oldDialogPane = dialogPaneRef.get();
if (oldDialogPane != null) {
// clean up
oldDialogPane.expandedProperty().removeListener(expandedListener);
oldDialogPane.headerProperty().removeListener(headerListener);
oldDialogPane.headerTextProperty().removeListener(headerListener);
oldDialogPane.setDialog(null);
}
final DialogPane newDialogPane = getDialogPane();
if (newDialogPane != null) {
newDialogPane.setDialog(Dialog.this);
// if the buttons change, we dynamically update the dialog
newDialogPane.getButtonTypes().addListener((ListChangeListener) c -> {
newDialogPane.requestLayout();
});
newDialogPane.expandedProperty().addListener(expandedListener);
newDialogPane.headerProperty().addListener(headerListener);
newDialogPane.headerTextProperty().addListener(headerListener);
updatePseudoClassState();
newDialogPane.requestLayout();
}
// push the new dialog down into the implementation for rendering
dialog.setDialogPane(newDialogPane);
dialogPaneRef = new WeakReference(newDialogPane);
}
};
public final ObjectProperty dialogPaneProperty() {
return dialogPane;
}
public final DialogPane getDialogPane() {
return dialogPane.get();
}
public final void setDialogPane(DialogPane value) {
dialogPane.set(value);
}
// --- content text (forwarded from DialogPane)
/**
* A property representing the content text for the dialog pane. The content text
* is lower precedence than the {@link DialogPane#contentProperty() content node}, meaning
* that if both the content node and the contentText properties are set, the
* content text will not be displayed in a default DialogPane instance.
* @return the property representing the content text for the dialog pane
*/
public final StringProperty contentTextProperty() {
return getDialogPane().contentTextProperty();
}
/**
* Returns the currently-set content text for this DialogPane.
* @return the currently-set content text for this DialogPane
*/
public final String getContentText() {
return getDialogPane().getContentText();
}
/**
* Sets the string to show in the dialog content area. Note that the content text
* is lower precedence than the {@link DialogPane#contentProperty() content node}, meaning
* that if both the content node and the contentText properties are set, the
* content text will not be displayed in a default DialogPane instance.
* @param contentText the string to show in the dialog content area
*/
public final void setContentText(String contentText) {
getDialogPane().setContentText(contentText);
}
// --- header text (forwarded from DialogPane)
/**
* A property representing the header text for the dialog pane. The header text
* is lower precedence than the {@link DialogPane#headerProperty() header node}, meaning
* that if both the header node and the headerText properties are set, the
* header text will not be displayed in a default DialogPane instance.
* @return a property representing the header text for the dialog pane
*/
public final StringProperty headerTextProperty() {
return getDialogPane().headerTextProperty();
}
/**
* Returns the currently-set header text for this DialogPane.
* @return the currently-set header text for this DialogPane
*/
public final String getHeaderText() {
return getDialogPane().getHeaderText();
}
/**
* Sets the string to show in the dialog header area. Note that the header text
* is lower precedence than the {@link DialogPane#headerProperty() header node}, meaning
* that if both the header node and the headerText properties are set, the
* header text will not be displayed in a default DialogPane instance.
* @param headerText the string to show in the dialog header area
*/
public final void setHeaderText(String headerText) {
getDialogPane().setHeaderText(headerText);
}
// --- graphic (forwarded from DialogPane)
/**
* The dialog graphic, presented either in the header, if one is showing, or
* to the left of the {@link DialogPane#contentProperty() content}.
*
* @return An ObjectProperty wrapping the current graphic.
*/
public final ObjectProperty graphicProperty() {
return getDialogPane().graphicProperty();
}
public final Node getGraphic() {
return getDialogPane().getGraphic();
}
/**
* Sets the dialog graphic, which will be displayed either in the header, if
* one is showing, or to the left of the {@link DialogPane#contentProperty() content}.
*
* @param graphic
* The new dialog graphic, or null if no graphic should be shown.
*/
public final void setGraphic(Node graphic) {
getDialogPane().setGraphic(graphic);
}
// --- result
private final ObjectProperty resultProperty = new SimpleObjectProperty() {
protected void invalidated() {
close();
}
};
/**
* A property representing what has been returned from the dialog. A result
* is generated through the {@link #resultConverterProperty() result converter},
* which is intended to convert from the {@link ButtonType} that the user
* clicked on into a value of type R. Refer to the {@link Dialog} class
* JavaDoc for more details.
* @return a property representing what has been returned from the dialog
*/
public final ObjectProperty resultProperty() {
return resultProperty;
}
public final R getResult() {
return resultProperty().get();
}
public final void setResult(R value) {
this.resultProperty().set(value);
}
// --- result converter
private final ObjectProperty> resultConverterProperty
= new SimpleObjectProperty<>(this, "resultConverter");
/**
* API to convert the {@link ButtonType} that the user clicked on into a
* result that can be returned via the {@link #resultProperty() result}
* property. This is necessary as {@link ButtonType} represents the visual
* button within the dialog, and do not know how to map themselves to a valid
* result - that is a requirement of the dialog implementation by making use
* of the result converter. In some cases, the result type of a Dialog
* subclass is ButtonType (which means that the result converter can be null),
* but in some cases (where the result type, R, is not ButtonType or Void),
* this callback must be specified.
* @return the API to convert the {@link ButtonType} that the user clicked on
*/
public final ObjectProperty> resultConverterProperty() {
return resultConverterProperty;
}
public final Callback getResultConverter() {
return resultConverterProperty().get();
}
public final void setResultConverter(Callback value) {
this.resultConverterProperty().set(value);
}
// --- showing
/**
* Represents whether the dialog is currently showing.
* @return the property representing whether the dialog is currently showing
*/
public final ReadOnlyBooleanProperty showingProperty() {
return dialog.showingProperty();
}
/**
* Returns whether or not the dialog is showing.
*
* @return true if dialog is showing.
*/
public final boolean isShowing() {
return showingProperty().get();
}
// --- resizable
/**
* Represents whether the dialog is resizable.
* @return the property representing whether the dialog is resizable
*/
public final BooleanProperty resizableProperty() {
return dialog.resizableProperty();
}
/**
* Returns whether or not the dialog is resizable.
*
* @return true if dialog is resizable.
*/
public final boolean isResizable() {
return resizableProperty().get();
}
/**
* Sets whether the dialog can be resized by the user.
* Resizable dialogs can also be maximized ( maximize button
* becomes visible)
*
* @param resizable true if dialog should be resizable.
*/
public final void setResizable(boolean resizable) {
resizableProperty().set(resizable);
}
// --- width
/**
* Property representing the width of the dialog.
* @return the property representing the width of the dialog
*/
public final ReadOnlyDoubleProperty widthProperty() {
return dialog.widthProperty();
}
/**
* Returns the width of the dialog.
* @return the width of the dialog
*/
public final double getWidth() {
return widthProperty().get();
}
/**
* Sets the width of the dialog.
* @param width the width of the dialog
*/
public final void setWidth(double width) {
dialog.setWidth(width);
}
// --- height
/**
* Property representing the height of the dialog.
* @return the property representing the height of the dialog
*/
public final ReadOnlyDoubleProperty heightProperty() {
return dialog.heightProperty();
}
/**
* Returns the height of the dialog.
* @return the height of the dialog
*/
public final double getHeight() {
return heightProperty().get();
}
/**
* Sets the height of the dialog.
* @param height the height of the dialog
*/
public final void setHeight(double height) {
dialog.setHeight(height);
}
// --- title
/**
* Return the titleProperty of the dialog.
* @return the titleProperty of the dialog
*/
public final StringProperty titleProperty(){
return this.dialog.titleProperty();
}
/**
* Return the title of the dialog.
* @return the title of the dialog
*/
public final String getTitle(){
return this.dialog.titleProperty().get();
}
/**
* Change the Title of the dialog.
* @param title the Title of the dialog
*/
public final void setTitle(String title){
this.dialog.titleProperty().set(title);
}
// --- x
public final double getX() {
return dialog.getX();
}
public final void setX(double x) {
dialog.setX(x);
}
/**
* The horizontal location of this {@code Dialog}. Changing this attribute
* will move the {@code Dialog} horizontally.
* @return the horizontal location of this {@code Dialog}
*/
public final ReadOnlyDoubleProperty xProperty() {
return dialog.xProperty();
}
// --- y
public final double getY() {
return dialog.getY();
}
public final void setY(double y) {
dialog.setY(y);
}
/**
* The vertical location of this {@code Dialog}. Changing this attribute
* will move the {@code Dialog} vertically.
* @return the vertical location of this {@code Dialog}
*/
public final ReadOnlyDoubleProperty yProperty() {
return dialog.yProperty();
}
/* *************************************************************************
*
* Events
*
**************************************************************************/
private final EventHandlerManager eventHandlerManager = new EventHandlerManager(this);
/** {@inheritDoc} */
@Override public EventDispatchChain buildEventDispatchChain(EventDispatchChain tail) {
return tail.prepend(eventHandlerManager);
}
/**
* Called just prior to the Dialog being shown.
*/
private ObjectProperty> onShowing;
public final void setOnShowing(EventHandler value) { onShowingProperty().set(value); }
public final EventHandler getOnShowing() {
return onShowing == null ? null : onShowing.get();
}
public final ObjectProperty> onShowingProperty() {
if (onShowing == null) {
onShowing = new SimpleObjectProperty>(this, "onShowing") {
@Override protected void invalidated() {
eventHandlerManager.setEventHandler(DialogEvent.DIALOG_SHOWING, get());
}
};
}
return onShowing;
}
/**
* Called just after the Dialog is shown.
*/
private ObjectProperty> onShown;
public final void setOnShown(EventHandler value) { onShownProperty().set(value); }
public final EventHandler getOnShown() {
return onShown == null ? null : onShown.get();
}
public final ObjectProperty> onShownProperty() {
if (onShown == null) {
onShown = new SimpleObjectProperty>(this, "onShown") {
@Override protected void invalidated() {
eventHandlerManager.setEventHandler(DialogEvent.DIALOG_SHOWN, get());
}
};
}
return onShown;
}
/**
* Called just prior to the Dialog being hidden.
*/
private ObjectProperty> onHiding;
public final void setOnHiding(EventHandler value) { onHidingProperty().set(value); }
public final EventHandler getOnHiding() {
return onHiding == null ? null : onHiding.get();
}
public final ObjectProperty> onHidingProperty() {
if (onHiding == null) {
onHiding = new SimpleObjectProperty>(this, "onHiding") {
@Override protected void invalidated() {
eventHandlerManager.setEventHandler(DialogEvent.DIALOG_HIDING, get());
}
};
}
return onHiding;
}
/**
* Called just after the Dialog has been hidden.
* When the {@code Dialog} is hidden, this event handler is invoked allowing
* the developer to clean up resources or perform other tasks when the
* {@link Alert} is closed.
*/
private ObjectProperty> onHidden;
public final void setOnHidden(EventHandler value) { onHiddenProperty().set(value); }
public final EventHandler getOnHidden() {
return onHidden == null ? null : onHidden.get();
}
public final ObjectProperty> onHiddenProperty() {
if (onHidden == null) {
onHidden = new SimpleObjectProperty>(this, "onHidden") {
@Override protected void invalidated() {
eventHandlerManager.setEventHandler(DialogEvent.DIALOG_HIDDEN, get());
}
};
}
return onHidden;
}
/**
* Called when there is an external request to close this {@code Dialog}.
* The installed event handler can prevent dialog closing by consuming the
* received event.
*/
private ObjectProperty> onCloseRequest;
public final void setOnCloseRequest(EventHandler value) {
onCloseRequestProperty().set(value);
}
public final EventHandler getOnCloseRequest() {
return (onCloseRequest != null) ? onCloseRequest.get() : null;
}
public final ObjectProperty>
onCloseRequestProperty() {
if (onCloseRequest == null) {
onCloseRequest = new SimpleObjectProperty>(this, "onCloseRequest") {
@Override protected void invalidated() {
eventHandlerManager.setEventHandler(DialogEvent.DIALOG_CLOSE_REQUEST, get());
}
};
}
return onCloseRequest;
}
/* *************************************************************************
*
* Private implementation
*
**************************************************************************/
// This code is called both in the normal and in the abnormal case (i.e.
// both when a button is clicked and when the user forces a window closed
// with keyboard OS-specific shortcuts or OS-native titlebar buttons).
@SuppressWarnings("unchecked")
void setResultAndClose(ButtonType cmd, boolean close) {
Callback resultConverter = getResultConverter();
R priorResultValue = getResult();
R newResultValue = null;
if (resultConverter == null) {
// The choice to cast cmd to R here was a conscious decision, taking
// into account the choices available to us. Firstly, to summarise the
// issue, at this point here we have a null result converter, and no
// idea how to convert the given ButtonType to R. Our options are:
//
// 1) We could throw an exception here, but this requires that all
// developers who create a dialog set a result converter (at least
// setResultConverter(buttonType -> (R) buttonType)). This is
// non-intuitive and depends on the developer reading documentation.
//
// 2) We could set a default result converter in the resultConverter
// property that does the identity conversion. This saves people from
// having to set a default result converter, but it is a little odd
// that the result converter is non-null by default.
//
// 3) We can cast the button type here, which is what we do. This means
// that the result converter is null by default.
//
// In the case of option 1), developers will receive a NPE when the
// dialog is closed, regardless of how it was closed. In the case of
// option 2) and 3), the user unfortunately receives a ClassCastException
// in their code. This is unfortunate as it is not immediately obvious
// why the ClassCastException occurred, and how to resolve it. However,
// we decided to take this later approach as it prevents the issue of
// requiring all custom dialog developers from having to supply their
// own result converters.
newResultValue = (R) cmd;
} else {
newResultValue = resultConverter.call(cmd);
}
setResult(newResultValue);
// fix for the case where we set the same result as what
// was already set. We should still close the dialog, but
// we need to special-case it here, as the result property
// won't fire any event if the value won't change.
if (close && priorResultValue == newResultValue) {
close();
}
}
/* *************************************************************************
*
* Stylesheet Handling
*
**************************************************************************/
private static final PseudoClass HEADER_PSEUDO_CLASS =
PseudoClass.getPseudoClass("header"); //$NON-NLS-1$
private static final PseudoClass NO_HEADER_PSEUDO_CLASS =
PseudoClass.getPseudoClass("no-header"); //$NON-NLS-1$
private void updatePseudoClassState() {
DialogPane dialogPane = getDialogPane();
if (dialogPane != null) {
final boolean hasHeader = getDialogPane().hasHeader();
dialogPane.pseudoClassStateChanged(HEADER_PSEUDO_CLASS, hasHeader);
dialogPane.pseudoClassStateChanged(NO_HEADER_PSEUDO_CLASS, !hasHeader);
}
}
}
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