JavaFX DatePicker

JavaFX DatePicker允许从给定日历中选择一天。DatePicker控件包含一个带有日期字段和日期选择器的组合框。JavaFX DatePicker控件使用JDK8日期时间API。

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.DatePicker;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;public class Main extends Application {public static void main(String[] args) {launch(args);}@Overridepublic void start(Stage stage) {VBox vbox = new VBox(20);Scene scene = new Scene(vbox, 400, 400);stage.setScene(scene);DatePicker checkInDatePicker = new DatePicker();vbox.getChildren().add(checkInDatePicker);stage.show();}
}

DatePicker创建

我们可以创建一个DatePicker并在类构造函数中设置一个特定的日期值。

dateP = new DatePicker(LocalDate.of(2018, 10, 8));

还可以使用setValue()方法设置日期值。

checkInDatePicker.setValue(LocalDate.of(2014, 10, 8));
checkInDatePicker.setValue(LocalDate.now());

以下代码使用setValue()向结束DatePicker添加更多时间。

import java.time.LocalDate;import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.DatePicker;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;public class Main extends Application {public static void main(String[] args) {launch(args);}@Overridepublic void start(Stage stage) {VBox vbox = new VBox(20);Scene scene = new Scene(vbox, 400, 400);stage.setScene(scene);DatePicker startDatePicker = new DatePicker();DatePicker endDatePicker = new DatePicker();startDatePicker.setValue(LocalDate.now());endDatePicker.setValue(startDatePicker.getValue().plusDays(1));vbox.getChildren().add(new Label("Start Date:"));vbox.getChildren().add(startDatePicker);vbox.getChildren().add(new Label("End Date:"));vbox.getChildren().add(endDatePicker);stage.show();}
}

自定义日期选择器

可以通过使用setShowWeekNumbers()方法来启用和禁用在DatePicker中显示ISO周数。

dateP.setShowWeekNumbers(true);

默认情况下，DatePicker使用系统区域设置和ISO日历系统定义的日期格式

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.DatePicker;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.StringConverter;public class Main extends Application {public static void main(String[] args) {launch(args);}@Overridepublic void start(Stage stage) {String pattern = "yyyy-MM-dd";VBox vbox = new VBox(20);Scene scene = new Scene(vbox, 400, 400);stage.setScene(scene);DatePicker checkInDatePicker = new DatePicker();StringConverter<LocalDate> converter = new StringConverter<LocalDate>() {DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern(pattern);@Overridepublic String toString(LocalDate date) {if (date != null) {return dateFormatter.format(date);} else {return "";}}@Overridepublic LocalDate fromString(String string) {if (string != null && !string.isEmpty()) {return LocalDate.parse(string, dateFormatter);} else {return null;}}};checkInDatePicker.setConverter(converter);checkInDatePicker.setPromptText(pattern.toLowerCase());vbox.getChildren().add(checkInDatePicker);checkInDatePicker.requestFocus();stage.show();}
}

DateCell

默认情况下，日历元素中的所有单元格都可供选择。可以使用日期单元工厂禁用单元格。

import java.time.LocalDate;import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.DateCell;
import javafx.scene.control.DatePicker;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.Callback;public class Main extends Application {public static void main(String[] args) {launch(args);}@Overridepublic void start(Stage stage) {VBox vbox = new VBox(20);Scene scene = new Scene(vbox, 400, 400);stage.setScene(scene);DatePicker startDatePicker = new DatePicker();DatePicker endDatePicker = new DatePicker();startDatePicker.setValue(LocalDate.now());final Callback<DatePicker, DateCell> dayCellFactory = new Callback<DatePicker, DateCell>() {@Overridepublic DateCell call(final DatePicker datePicker) {return new DateCell() {@Overridepublic void updateItem(LocalDate item, boolean empty) {super.updateItem(item, empty);if (item.isBefore(startDatePicker.getValue().plusDays(1))) {setDisable(true);setStyle("-fx-background-color: #EEEEEE;");}}};}};endDatePicker.setDayCellFactory(dayCellFactory);endDatePicker.setValue(startDatePicker.getValue().plusDays(1));vbox.getChildren().add(new Label("Start Date:"));vbox.getChildren().add(startDatePicker);vbox.getChildren().add(new Label("End Date:"));vbox.getChildren().add(endDatePicker);stage.show();}
}

示例

为每个日期单元格安装工具提示。

import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.DateCell;
import javafx.scene.control.DatePicker;
import javafx.scene.control.Label;
import javafx.scene.control.Tooltip;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.Callback;public class Main extends Application {public static void main(String[] args) {launch(args);}@Overridepublic void start(Stage stage) {VBox vbox = new VBox(20);Scene scene = new Scene(vbox, 400, 400);stage.setScene(scene);final DatePicker startDatePicker = new DatePicker();DatePicker endDatePicker = new DatePicker();startDatePicker.setValue(LocalDate.now());final Callback<DatePicker, DateCell> dayCellFactory = new Callback<DatePicker, DateCell>() {@Overridepublic DateCell call(final DatePicker datePicker) {return new DateCell() {@Overridepublic void updateItem(LocalDate item, boolean empty) {super.updateItem(item, empty);long p = ChronoUnit.DAYS.between(startDatePicker.getValue(), item);setTooltip(new Tooltip("You're about to stay for " + p + " days"));}};}};endDatePicker.setDayCellFactory(dayCellFactory);endDatePicker.setValue(startDatePicker.getValue().plusDays(1));vbox.getChildren().add(new Label("Start Date:"));vbox.getChildren().add(startDatePicker);vbox.getChildren().add(new Label("End Date:"));vbox.getChildren().add(endDatePicker);stage.show();}
}