适配 TableView 菜单按钮 [英] Adapt TableView menu button
本文介绍了适配 TableView 菜单按钮的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
问题
TableView 的 setTableMenuButtonVisible 提供了一种改变表格列可见性的机制.然而，该功能还有很多不足之处:
The setTableMenuButtonVisible of a TableView provides a mechanism to change the visibility of a table column. However that functionality leaves a lot to be desired:
菜单应保持打开状态.我有 e.G.15个表格列，点击菜单打开->点击列->点击菜单打开->点击下一列->...改变多列的可见性很痛苦
The menu should remain open. I have e. g. 15 table columns and it's a pain to click menu open -> click column -> click menu open -> click next column -> ... It's a pain to change the visibility of multiple columns
应该有全选/取消全选功能
There should be a select all / deselect all functionality
应该有一种方法可以使用自定义项扩展菜单
There should be a way to extend the menu with custom items
取消选择所有列后，无法重新选择列，因为标题和表格菜单都消失了
After you deselected all columns there's no way to reselect a column because the header is gone and with it the table menu
换句话说:表格菜单的当前实现是相当无用的.
In other words: The current implementation of the table menu is rather useless.
问题
有谁知道如何用适当的菜单替换现有的tableview菜单?我见过一个带有.show-hide-columns-button"样式查找并添加事件过滤器的解决方案.不过那是 2 年前的事了，也许事情已经改变了.
Does anyone know of a way about how to replace the existing tableview menu with a proper one? I've seen a solution with a ".show-hide-columns-button" style lookup and adding an event filter. However that was 2 years ago, maybe things changed.
非常感谢！
这就是我想要的方式，通过 ContextMenu 演示(即鼠标右键单击表格):
This is how I'd like to have it, demonstrated via ContextMenu (i. e. right mouse button click on table):
public class TableViewSample extends Application {
private final TableView table = new TableView();
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
Scene scene = new Scene(new Group());
stage.setTitle("Table View Sample");
stage.setWidth(300);
stage.setHeight(500);
// create table columns
TableColumn firstNameCol = new TableColumn("First Name");
TableColumn lastNameCol = new TableColumn("Last Name");
TableColumn emailCol = new TableColumn("Email");
table.getColumns().addAll(firstNameCol, lastNameCol, emailCol);
// add context menu
CustomMenuItem cmi;
ContextMenu cm = new ContextMenu();
// select all item
Label selectAll = new Label( "Select all");
selectAll.addEventHandler( MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
for( Object obj: table.getColumns()) {
((TableColumn) obj).setVisible(true);
} }
});
cmi = new CustomMenuItem( selectAll);
cmi.setHideOnClick(false);
cm.getItems().add( cmi);
// deselect all item
Label deselectAll = new Label("Deselect all");
deselectAll.addEventHandler(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
for (Object obj : table.getColumns()) {
((TableColumn) obj).setVisible(false);
}
}
});
cmi = new CustomMenuItem( deselectAll);
cmi.setHideOnClick(false);
cm.getItems().add( cmi);
// separator
cm.getItems().add( new SeparatorMenuItem());
// menu item for all columns
for( Object obj: table.getColumns()) {
TableColumn tableColumn = (TableColumn) obj;
CheckBox cb = new CheckBox( tableColumn.getText());
cb.selectedProperty().bindBidirectional( tableColumn.visibleProperty());
cmi = new CustomMenuItem( cb);
cmi.setHideOnClick(false);
cm.getItems().add( cmi);
}
// set context menu
table.setContextMenu(cm);
final VBox vbox = new VBox();
vbox.setSpacing(5);
vbox.setPadding(new Insets(10, 0, 0, 10));
vbox.getChildren().addAll(table);
((Group) scene.getRoot()).getChildren().addAll(vbox);
stage.setScene(scene);
stage.show();
}
}
推荐答案
受到 ControlsFX 解决方案的启发，我自己使用反射解决了这个问题.如果有人有更好的主意和更清洁的方法而无需反思，我会全力以赴.我创建了一个 utils 类，以便与示例代码区分开来.
Inspired by the solution of ControlsFX I solved the problem myself using reflection. If someone has a better idea and cleaner way without reflection, I'm all ears. I created a utils class in order to distinguish from the sample code.
import java.lang.reflect.Field;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.scene.Node;
import javafx.scene.control.CheckBox;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.CustomMenuItem;
import javafx.scene.control.Label;
import javafx.scene.control.SeparatorMenuItem;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.input.MouseEvent;
import com.sun.javafx.scene.control.skin.TableHeaderRow;
import com.sun.javafx.scene.control.skin.TableViewSkin;
public class TableViewUtils {
/**
* Make table menu button visible and replace the context menu with a custom context menu via reflection.
* The preferred height is modified so that an empty header row remains visible. This is needed in case you remove all columns, so that the menu button won't disappear with the row header.
* IMPORTANT: Modification is only possible AFTER the table has been made visible, otherwise you'd get a NullPointerException
* @param tableView
*/
public static void addCustomTableMenu( TableView tableView) {
// enable table menu
tableView.setTableMenuButtonVisible(true);
// get the table header row
TableHeaderRow tableHeaderRow = getTableHeaderRow((TableViewSkin) tableView.getSkin());
// get context menu via reflection
ContextMenu contextMenu = getContextMenu(tableHeaderRow);
// setting the preferred height for the table header row
// if the preferred height isn't set, then the table header would disappear if there are no visible columns
// and with it the table menu button
// by setting the preferred height the header will always be visible
// note: this may need adjustments in case you have different heights in columns (eg when you use grouping)
double defaultHeight = tableHeaderRow.getHeight();
tableHeaderRow.setPrefHeight(defaultHeight);
// modify the table menu
contextMenu.getItems().clear();
addCustomMenuItems( contextMenu, tableView);
}
/**
* Create a menu with custom items. The important thing is that the menu remains open while you click on the menu items.
* @param cm
* @param table
*/
private static void addCustomMenuItems( ContextMenu cm, TableView table) {
// create new context menu
CustomMenuItem cmi;
// select all item
Label selectAll = new Label("Select all");
selectAll.addEventHandler(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
for (Object obj : table.getColumns()) {
((TableColumn<?, ?>) obj).setVisible(true);
}
}
});
cmi = new CustomMenuItem(selectAll);
cmi.setHideOnClick(false);
cm.getItems().add(cmi);
// deselect all item
Label deselectAll = new Label("Deselect all");
deselectAll.addEventHandler(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
for (Object obj : table.getColumns()) {
((TableColumn<?, ?>) obj).setVisible(false);
}
}
});
cmi = new CustomMenuItem(deselectAll);
cmi.setHideOnClick(false);
cm.getItems().add(cmi);
// separator
cm.getItems().add(new SeparatorMenuItem());
// menu item for each of the available columns
for (Object obj : table.getColumns()) {
TableColumn<?, ?> tableColumn = (TableColumn<?, ?>) obj;
CheckBox cb = new CheckBox(tableColumn.getText());
cb.selectedProperty().bindBidirectional(tableColumn.visibleProperty());
cmi = new CustomMenuItem(cb);
cmi.setHideOnClick(false);
cm.getItems().add(cmi);
}
}
/**
* Find the TableHeaderRow of the TableViewSkin
*
* @param tableSkin
* @return
*/
private static TableHeaderRow getTableHeaderRow(TableViewSkin<?> tableSkin) {
// get all children of the skin
ObservableList<Node> children = tableSkin.getChildren();
// find the TableHeaderRow child
for (int i = 0; i < children.size(); i++) {
Node node = children.get(i);
if (node instanceof TableHeaderRow) {
return (TableHeaderRow) node;
}
}
return null;
}
/**
* Get the table menu, i. e. the ContextMenu of the given TableHeaderRow via
* reflection
*
* @param headerRow
* @return
*/
private static ContextMenu getContextMenu(TableHeaderRow headerRow) {
try {
// get columnPopupMenu field
Field privateContextMenuField = TableHeaderRow.class.getDeclaredField("columnPopupMenu");
// make field public
privateContextMenuField.setAccessible(true);
// get field
ContextMenu contextMenu = (ContextMenu) privateContextMenuField.get(headerRow);
return contextMenu;
} catch (Exception ex) {
ex.printStackTrace();
}
return null;
}
}
示例用法:
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.VBox;
import javafx.scene.text.Text;
import javafx.stage.Stage;
public class CustomTableMenuDemo extends Application {
private final ObservableList<Person> data =
FXCollections.observableArrayList(
new Person("Jacob", "Smith", "jacob.smith@example.com"),
new Person("Isabella", "Johnson", "isabella.johnson@example.com"),
new Person("Ethan", "Williams", "ethan.williams@example.com"),
new Person("Emma", "Jones", "emma.jones@example.com"),
new Person("Isabella", "Johnson", "isabella.johnson@example.com"),
new Person("Ethan", "Williams", "ethan.williams@example.com"),
new Person("Emma", "Jones", "emma.jones@example.com"),
new Person("Isabella", "Johnson", "isabella.johnson@example.com"),
new Person("Ethan", "Williams", "ethan.williams@example.com"),
new Person("Emma", "Jones", "emma.jones@example.com"),
new Person("Isabella", "Johnson", "isabella.johnson@example.com"),
new Person("Ethan", "Williams", "ethan.williams@example.com"),
new Person("Emma", "Jones", "emma.jones@example.com"),
new Person("Isabella", "Johnson", "isabella.johnson@example.com"),
new Person("Ethan", "Williams", "ethan.williams@example.com"),
new Person("Emma", "Jones", "emma.jones@example.com"),
new Person("Isabella", "Johnson", "isabella.johnson@example.com"),
new Person("Ethan", "Williams", "ethan.williams@example.com"),
new Person("Emma", "Jones", "emma.jones@example.com"),
new Person("Michael", "Brown", "michael.brown@example.com"));
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
stage.setTitle("Table Menu Demo");
stage.setWidth(500);
stage.setHeight(550);
// create table columns
TableColumn<Person, String> firstNameCol = new TableColumn<Person, String>("First Name");
firstNameCol.setMinWidth(100);
firstNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("firstName"));
TableColumn<Person, String> lastNameCol = new TableColumn<Person, String>("Last Name");
lastNameCol.setMinWidth(100);
lastNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("lastName"));
TableColumn<Person, String> emailCol = new TableColumn<Person, String>("Email");
emailCol.setMinWidth(180);
emailCol.setCellValueFactory(new PropertyValueFactory<Person, String>("email"));
TableView<Person> tableView = new TableView<>();
tableView.setPlaceholder(new Text("No content in table"));
tableView.setItems(data);
tableView.getColumns().addAll(firstNameCol, lastNameCol, emailCol);
final VBox vbox = new VBox();
vbox.setSpacing(5);
vbox.setPadding(new Insets(10, 10, 10, 10));
BorderPane borderPane = new BorderPane();
borderPane.setCenter( tableView);
vbox.getChildren().addAll( borderPane);
Scene scene = new Scene( vbox);
stage.setScene(scene);
stage.show();
// enable table menu button and add a custom menu to it
TableViewUtils.addCustomTableMenu(tableView);
}
public static class Person {
private final SimpleStringProperty firstName;
private final SimpleStringProperty lastName;
private final SimpleStringProperty email;
private Person(String fName, String lName, String email) {
this.firstName = new SimpleStringProperty(fName);
this.lastName = new SimpleStringProperty(lName);
this.email = new SimpleStringProperty(email);
}
public String getFirstName() {
return firstName.get();
}
public void setFirstName(String fName) {
firstName.set(fName);
}
public String getLastName() {
return lastName.get();
}
public void setLastName(String fName) {
lastName.set(fName);
}
public String getEmail() {
return email.get();
}
public void setEmail(String fName) {
email.set(fName);
}
}
}
截图:
自定义表格菜单正在运行，当您单击按钮时菜单保持打开状态:
Custom table menu in action, the menu remains open while you click the buttons:
自定义表格菜单仍然可用，即使没有列可见:
Custom table menu still available, even though no columns are visible:
这里有一个版本，它不是反射，而是使用一些启发式方法并替换了内部鼠标事件处理程序(如果您想了解更多信息，请参阅 JavaFX 的 TableHeaderRow 类的源代码):
And here's a version that instead of reflection uses some heuristic and replaces the internal mouse event handler (see the source of JavaFX's TableHeaderRow class if you want to know more):
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.geometry.Side;
import javafx.scene.Node;
import javafx.scene.control.CheckBox;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.CustomMenuItem;
import javafx.scene.control.Label;
import javafx.scene.control.SeparatorMenuItem;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.input.MouseEvent;
import com.sun.javafx.scene.control.skin.TableHeaderRow;
import com.sun.javafx.scene.control.skin.TableViewSkin;
public class TableViewUtils {
/**
* Make table menu button visible and replace the context menu with a custom context menu via reflection.
* The preferred height is modified so that an empty header row remains visible. This is needed in case you remove all columns, so that the menu button won't disappear with the row header.
* IMPORTANT: Modification is only possible AFTER the table has been made visible, otherwise you'd get a NullPointerException
* @param tableView
*/
public static void addCustomTableMenu( TableView tableView) {
// enable table menu
tableView.setTableMenuButtonVisible(true);
// replace internal mouse listener with custom listener
setCustomContextMenu( tableView);
}
private static void setCustomContextMenu( TableView table) {
TableViewSkin<?> tableSkin = (TableViewSkin<?>) table.getSkin();
// get all children of the skin
ObservableList<Node> children = tableSkin.getChildren();
// find the TableHeaderRow child
for (int i = 0; i < children.size(); i++) {
Node node = children.get(i);
if (node instanceof TableHeaderRow) {
TableHeaderRow tableHeaderRow = (TableHeaderRow) node;
// setting the preferred height for the table header row
// if the preferred height isn't set, then the table header would disappear if there are no visible columns
// and with it the table menu button
// by setting the preferred height the header will always be visible
// note: this may need adjustments in case you have different heights in columns (eg when you use grouping)
double defaultHeight = tableHeaderRow.getHeight();
tableHeaderRow.setPrefHeight(defaultHeight);
for( Node child: tableHeaderRow.getChildren()) {
// child identified as cornerRegion in TableHeaderRow.java
if( child.getStyleClass().contains( "show-hide-columns-button")) {
// get the context menu
ContextMenu columnPopupMenu = createContextMenu( table);
// replace mouse listener
child.setOnMousePressed(me -> {
// show a popupMenu which lists all columns
columnPopupMenu.show(child, Side.BOTTOM, 0, 0);
me.consume();
});
}
}
}
}
}
/**
* Create a menu with custom items. The important thing is that the menu remains open while you click on the menu items.
* @param cm
* @param table
*/
private static ContextMenu createContextMenu( TableView table) {
ContextMenu cm = new ContextMenu();
// create new context menu
CustomMenuItem cmi;
// select all item
Label selectAll = new Label("Select all");
selectAll.addEventHandler(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
for (Object obj : table.getColumns()) {
((TableColumn<?, ?>) obj).setVisible(true);
}
}
});
cmi = new CustomMenuItem(selectAll);
cmi.setHideOnClick(false);
cm.getItems().add(cmi);
// deselect all item
Label deselectAll = new Label("Deselect all");
deselectAll.addEventHandler(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
for (Object obj : table.getColumns()) {
((TableColumn<?, ?>) obj).setVisible(false);
}
}
});
cmi = new CustomMenuItem(deselectAll);
cmi.setHideOnClick(false);
cm.getItems().add(cmi);
// separator
cm.getItems().add(new SeparatorMenuItem());
// menu item for each of the available columns
for (Object obj : table.getColumns()) {
TableColumn<?, ?> tableColumn = (TableColumn<?, ?>) obj;
CheckBox cb = new CheckBox(tableColumn.getText());
cb.selectedProperty().bindBidirectional(tableColumn.visibleProperty());
cmi = new CustomMenuItem(cb);
cmi.setHideOnClick(false);
cm.getItems().add(cmi);
}
return cm;
}
}
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