我已經(jīng)編寫了一個新的自定義控件，并將其提交到ControlsFX項目。 這是一個高度專業(yè)的控件，用于顯示后臺任務，其當前狀態(tài)和進度的列表。 這實際上是我為ControlsFX編寫的第一個控件，只是出于樂趣的考慮，這意味著我自己沒有用例（但是肯定會有一個用例）。 下面的屏幕快照顯示了正在使用的控件。

如果您已經(jīng)熟悉javafx.concurrent.Task類，您將很快掌握該控件顯示其title，message和progress屬性的值。 但它還會顯示一個圖標，該圖標未包含在Task API中。 我添加了一個可選的圖形工廠（回調(diào)），將為每個任務調(diào)用該圖形工廠以查找將放置在表示該任務的列表視圖單元格左側(cè)的圖形節(jié)點。

可以在此處找到顯示控件正在運行的視頻：

控制

由于此控件非常簡單，因此我認為有必要為其發(fā)布完整的源代碼，以便其他人可以學習使用。 下面的清單顯示了控件本身的代碼。 如預期的那樣，它擴展了Control類，并為監(jiān)視的任務提供了一個可觀察的列表，并為圖形工廠（回調(diào)）提供了一個對象屬性。

package org.controlsfx.control;import impl.org.controlsfx.skin.TaskProgressViewSkin; import javafx.beans.property.ObjectProperty; import javafx.beans.property.SimpleObjectProperty; import javafx.collections.FXCollections; import javafx.collections.ListChangeListener; import javafx.collections.ObservableList; import javafx.concurrent.Task; import javafx.concurrent.WorkerStateEvent; import javafx.event.EventHandler; import javafx.scene.Node; import javafx.scene.control.Control; import javafx.scene.control.Skin; import javafx.util.Callback;/*** The task progress view is used to visualize the progress of long running* tasks. These tasks are created via the {@link Task} class. This view* manages a list of such tasks and displays each one of them with their* name, progress, and update messages.<p>* An optional graphic factory can be set to place a graphic in each row.* This allows the user to more easily distinguish between different types* of tasks.** <h3>Screenshots</h3>* The picture below shows the default appearance of the task progress view* control:* <center><img src="task-monitor.png" /></center>** <h3>Code Sample</h3>** <pre>* TaskProgressView<MyTask> view = new TaskProgressView<>();* view.setGraphicFactory(task -> return new ImageView("db-access.png"));* view.getTasks().add(new MyTask());* </pre>*/ public class TaskProgressView<T extends Task<?>> extends Control {/*** Constructs a new task progress view.*/public TaskProgressView() {getStyleClass().add("task-progress-view");EventHandler<WorkerStateEvent> taskHandler = evt -> {if (evt.getEventType().equals(WorkerStateEvent.WORKER_STATE_SUCCEEDED)|| evt.getEventType().equals(WorkerStateEvent.WORKER_STATE_CANCELLED)|| evt.getEventType().equals(WorkerStateEvent.WORKER_STATE_FAILED)) {getTasks().remove(evt.getSource());}};getTasks().addListener(new ListChangeListener<Task<?>>() {@Overridepublic void onChanged(Change<? extends Task<?>> c) {while (c.next()) {if (c.wasAdded()) {for (Task<?> task : c.getAddedSubList()) {task.addEventHandler(WorkerStateEvent.ANY,taskHandler);}} else if (c.wasRemoved()) {for (Task<?> task : c.getAddedSubList()) {task.removeEventHandler(WorkerStateEvent.ANY,taskHandler);}}}}});}@Overrideprotected Skin<?> createDefaultSkin() {return new TaskProgressViewSkin<>(this);}private final ObservableList<T> tasks = FXCollections.observableArrayList();/*** Returns the list of tasks currently monitored by this view.** @return the monitored tasks*/public final ObservableList<T> getTasks() {return tasks;}private ObjectProperty<Callback<T, Node>> graphicFactory;/*** Returns the property used to store an optional callback for creating* custom graphics for each task.** @return the graphic factory property*/public final ObjectProperty<Callback<T, Node>> graphicFactoryProperty() {if (graphicFactory == null) {graphicFactory = new SimpleObjectProperty<Callback<T, Node>>(this, "graphicFactory");}return graphicFactory;}/*** Returns the value of {@link #graphicFactoryProperty()}.** @return the optional graphic factory*/public final Callback<T, Node> getGraphicFactory() {return graphicFactory == null ? null : graphicFactory.get();}/*** Sets the value of {@link #graphicFactoryProperty()}.** @param factory an optional graphic factory*/public final void setGraphicFactory(Callback<T, Node> factory) {graphicFactoryProperty().set(factory);}

皮

如您所料，皮膚使用帶有自定義單元格工廠的ListView來顯示任務。

package impl.org.controlsfx.skin;import javafx.beans.binding.Bindings; import javafx.concurrent.Task; import javafx.geometry.Insets; import javafx.geometry.Pos; import javafx.scene.Node; import javafx.scene.control.Button; import javafx.scene.control.ContentDisplay; import javafx.scene.control.Label; import javafx.scene.control.ListCell; import javafx.scene.control.ListView; import javafx.scene.control.ProgressBar; import javafx.scene.control.SkinBase; import javafx.scene.control.Tooltip; import javafx.scene.layout.BorderPane; import javafx.scene.layout.VBox; import javafx.util.Callback;import org.controlsfx.control.TaskProgressView;import com.sun.javafx.css.StyleManager;public class TaskProgressViewSkin<T extends Task<?>> extendsSkinBase<TaskProgressView<T>> {static {StyleManager.getInstance().addUserAgentStylesheet(TaskProgressView.class.getResource("taskprogressview.css").toExternalForm()); //$NON-NLS-1$}public TaskProgressViewSkin(TaskProgressView<T> monitor) {super(monitor);BorderPane borderPane = new BorderPane();borderPane.getStyleClass().add("box");// list viewListView<T> listView = new ListView<>();listView.setPrefSize(500, 400);listView.setPlaceholder(new Label("No tasks running"));listView.setCellFactory(param -> new TaskCell());listView.setFocusTraversable(false);Bindings.bindContent(listView.getItems(), monitor.getTasks());borderPane.setCenter(listView);getChildren().add(listView);}class TaskCell extends ListCell<T> {private ProgressBar progressBar;private Label titleText;private Label messageText;private Button cancelButton;private T task;private BorderPane borderPane;public TaskCell() {titleText = new Label();titleText.getStyleClass().add("task-title");messageText = new Label();messageText.getStyleClass().add("task-message");progressBar = new ProgressBar();progressBar.setMaxWidth(Double.MAX_VALUE);progressBar.setMaxHeight(8);progressBar.getStyleClass().add("task-progress-bar");cancelButton = new Button("Cancel");cancelButton.getStyleClass().add("task-cancel-button");cancelButton.setTooltip(new Tooltip("Cancel Task"));cancelButton.setOnAction(evt -> {if (task != null) {task.cancel();}});VBox vbox = new VBox();vbox.setSpacing(4);vbox.getChildren().add(titleText);vbox.getChildren().add(progressBar);vbox.getChildren().add(messageText);BorderPane.setAlignment(cancelButton, Pos.CENTER);BorderPane.setMargin(cancelButton, new Insets(0, 0, 0, 4));borderPane = new BorderPane();borderPane.setCenter(vbox);borderPane.setRight(cancelButton);setContentDisplay(ContentDisplay.GRAPHIC_ONLY);}@Overridepublic void updateIndex(int index) {super.updateIndex(index);/** I have no idea why this is necessary but it won't work without* it. Shouldn't the updateItem method be enough?*/if (index == -1) {setGraphic(null);getStyleClass().setAll("task-list-cell-empty");}}@Overrideprotected void updateItem(T task, boolean empty) {super.updateItem(task, empty);this.task = task;if (empty || task == null) {getStyleClass().setAll("task-list-cell-empty");setGraphic(null);} else if (task != null) {getStyleClass().setAll("task-list-cell");progressBar.progressProperty().bind(task.progressProperty());titleText.textProperty().bind(task.titleProperty());messageText.textProperty().bind(task.messageProperty());cancelButton.disableProperty().bind(Bindings.not(task.runningProperty()));Callback<T, Node> factory = getSkinnable().getGraphicFactory();if (factory != null) {Node graphic = factory.call(task);if (graphic != null) {BorderPane.setAlignment(graphic, Pos.CENTER);BorderPane.setMargin(graphic, new Insets(0, 4, 0, 0));borderPane.setLeft(graphic);}} else {/** Really needed. The application might have used a graphic* factory before and then disabled it. In this case the border* pane might still have an old graphic in the left position.*/borderPane.setLeft(null);}setGraphic(borderPane);}}} }

CSS

下面的樣式表確保我們?yōu)槿蝿諛祟}使用粗體字體，更小/更細的進度條（無圓角），并在底部位置列出具有淡入/淡出分隔線的單元格。

.task-progress-view {-fx-background-color: white; }.task-progress-view > * > .label {-fx-text-fill: gray;-fx-font-size: 18.0;-fx-alignment: center;-fx-padding: 10.0 0.0 5.0 0.0; }.task-progress-view > * > .list-view {-fx-border-color: transparent;-fx-background-color: transparent; }.task-title {-fx-font-weight: bold; }.task-progress-bar .bar {-fx-padding: 6px;-fx-background-radius: 0;-fx-border-radius: 0; }.task-progress-bar .track {-fx-background-radius: 0; }.task-message { }.task-list-cell {-fx-background-color: transparent;-fx-padding: 4 10 8 10;-fx-border-color: transparent transparent linear-gradient(from 0.0% 0.0% to 100.0% 100.0%, transparent, rgba(0.0,0.0,0.0,0.2), transparent) transparent; }.task-list-cell-empty {-fx-background-color: transparent;-fx-border-color: transparent; }.task-cancel-button {-fx-base: red;-fx-font-size: .75em;-fx-font-weight: bold;-fx-padding: 4px;-fx-border-radius: 0;-fx-background-radius: 0; }

翻譯自: https://www.javacodegeeks.com/2014/10/new-custom-control-taskprogressview.html

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