com.vaadin.flow.component.crud.Crud Maven / Gradle / Ivy
/**
* Copyright 2000-2024 Vaadin Ltd.
*
* This program is available under Vaadin Commercial License and Service Terms.
*
* See {@literal } for the full
* license.
*/
package com.vaadin.flow.component.crud;
import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;
import com.vaadin.flow.component.AttachEvent;
import com.vaadin.flow.component.Component;
import com.vaadin.flow.component.ComponentEvent;
import com.vaadin.flow.component.ComponentEventListener;
import com.vaadin.flow.component.ComponentUtil;
import com.vaadin.flow.component.DomEvent;
import com.vaadin.flow.component.EventData;
import com.vaadin.flow.component.HasSize;
import com.vaadin.flow.component.HasStyle;
import com.vaadin.flow.component.HasTheme;
import com.vaadin.flow.component.Tag;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.dependency.JsModule;
import com.vaadin.flow.component.dependency.NpmPackage;
import com.vaadin.flow.component.grid.Grid;
import com.vaadin.flow.component.shared.SlotUtils;
import com.vaadin.flow.data.provider.DataProvider;
import com.vaadin.flow.data.renderer.LitRenderer;
import com.vaadin.flow.internal.JsonSerializer;
import com.vaadin.flow.shared.Registration;
import elemental.json.JsonObject;
/**
* A component for performing CRUD
* operations on a data backend (e.g entities from a database).
*
* @param
* the bean type
* @author Vaadin Ltd
*/
@Tag("vaadin-crud")
@NpmPackage(value = "@vaadin/polymer-legacy-adapter", version = "24.4.7")
@JsModule("@vaadin/polymer-legacy-adapter/style-modules.js")
@NpmPackage(value = "@vaadin/crud", version = "24.4.7")
@JsModule("@vaadin/crud/src/vaadin-crud.js")
@JsModule("@vaadin/crud/src/vaadin-crud-edit-column.js")
public class Crud extends Component implements HasSize, HasTheme, HasStyle {
private static final String EDIT_COLUMN_KEY = "vaadin-crud-edit-column";
private static final String EVENT_PREVENT_DEFAULT_JS = "event.preventDefault()";
private final Set>> newListeners = new LinkedHashSet<>();
private final Set>> editListeners = new LinkedHashSet<>();
private final Set>> saveListeners = new LinkedHashSet<>();
private final Set>> cancelListeners = new LinkedHashSet<>();
private final Set>> deleteListeners = new LinkedHashSet<>();
private Class beanType;
private Grid grid;
private CrudEditor editor;
private E gridActiveItem;
private boolean toolbarVisible = true;
private boolean saveBtnDisabledOverridden;
final private Button saveButton;
final private Button cancelButton;
final private Button deleteButton;
private Component newButton;
/**
* Instantiates a new Crud using a custom grid.
*
* @param beanType
* the class of items
* @param grid
* the grid with which the items listing should be displayed
* @param editor
* the editor for manipulating individual items
* @see com.vaadin.flow.component.crud.Crud#Crud(Class, CrudEditor)
* Crud(Class, CrudEditor)
*/
public Crud(Class beanType, Grid grid, CrudEditor editor) {
this();
setGrid(grid);
setEditor(editor);
setBeanType(beanType);
}
/**
* Instantiates a new Crud for the given bean type and uses the supplied
* editor. Furthermore, it displays the items using the built-in grid.
*
* @param beanType
* the class of items
* @param editor
* the editor for manipulating individual items
* @see CrudGrid
* @see com.vaadin.flow.component.crud.Crud#Crud(Class, Grid, CrudEditor)
* Crud(Class, Grid, CrudEditor)
*/
public Crud(Class beanType, CrudEditor editor) {
this();
setEditor(editor);
setBeanType(beanType);
}
/**
* Instantiates a new Crud with no grid, editor and runtime bean type
* information. The editor and bean type must be initialized before a Crud
* is put into full use therefore this constructor only exists for partial
* initialization in order to support template binding.
*
* @see #setEditor(CrudEditor)
* @see #setBeanType(Class)
*/
public Crud() {
setI18n(CrudI18n.createDefault(), false);
registerHandlers();
// Prevent web component from creating default buttons
getElement().setProperty("_noDefaultButtons", true);
newButton = new Button();
newButton.getElement().setAttribute("theme", "primary");
// Ensure the flag is set before the element is added to the slot
newButton.getElement().setProperty("_isDefault", true);
SlotUtils.addToSlot(this, "new-button", newButton);
saveButton = new SaveButton();
saveButton.addThemeName("primary");
// Ensure the flag is set before the element is added to the slot
saveButton.getElement().setProperty("_isDefault", true);
SlotUtils.addToSlot(this, "save-button", saveButton);
cancelButton = new Button();
cancelButton.addThemeName("tertiary");
// Ensure the flag is set before the element is added to the slot
cancelButton.getElement().setProperty("_isDefault", true);
SlotUtils.addToSlot(this, "cancel-button", cancelButton);
deleteButton = new Button();
deleteButton.addThemeNames("tertiary", "error");
// Ensure the flag is set before the element is added to the slot
deleteButton.getElement().setProperty("_isDefault", true);
SlotUtils.addToSlot(this, "delete-button", deleteButton);
}
private class SaveButton extends Button {
@Override
public void onEnabledStateChanged(boolean enabled) {
super.onEnabledStateChanged(enabled);
saveBtnDisabledOverridden = true;
overrideSaveDisabled(enabled);
}
}
@Override
protected void onAttach(AttachEvent attachEvent) {
super.onAttach(attachEvent);
if (saveBtnDisabledOverridden) {
overrideSaveDisabled(getSaveButton().isEnabled());
}
getElement().executeJs("this.__validate = function () {return true;}");
}
private void overrideSaveDisabled(boolean enabled) {
getElement().executeJs("this.__isSaveBtnDisabled = () => {return $0;}",
!enabled);
}
private void registerHandlers() {
ComponentUtil.addListener(this, NewEvent.class,
(ComponentEventListener) ((ComponentEventListener>) e -> {
try {
getEditor().setItem(e.getItem() != null ? e.getItem()
: getBeanType().newInstance());
clearActiveItem();
setClientIsNew(true);
} catch (Exception ex) {
throw new RuntimeException(
"Unable to instantiate new bean", ex);
}
NewEvent eventWithNewItem = new NewEvent(e.getSource(),
e.isFromClient(), getEditor().getItem(), null);
newListeners.forEach(listener -> listener
.onComponentEvent(eventWithNewItem));
}));
ComponentUtil.addListener(this, EditEvent.class,
(ComponentEventListener) ((ComponentEventListener>) e -> {
if (getEditor().getItem() != e.getItem()) {
getEditor().setItem(e.getItem(), true);
setOpened(true);
setClientIsNew(false);
if (isEditOnClick() && getGrid() instanceof CrudGrid) {
getGrid().select(e.getItem());
}
}
editListeners
.forEach(listener -> listener.onComponentEvent(e));
}));
ComponentUtil.addListener(this, CancelEvent.class,
(ComponentEventListener) ((ComponentEventListener>) e -> {
cancelListeners
.forEach(listener -> listener.onComponentEvent(e));
if ((this.gridActiveItem != null && this.getEditor()
.getItem() == this.gridActiveItem)
|| this.gridActiveItem == null) {
setOpened(false);
getEditor().clear();
clearActiveItem();
}
}));
ComponentUtil.addListener(this, SaveEvent.class,
(ComponentEventListener) ((ComponentEventListener>) e -> {
if (!getEditor().validate()) {
return;
}
getEditor().writeItemChanges();
try {
saveListeners.forEach(
listener -> listener.onComponentEvent(e));
setOpened(false);
getEditor().clear();
} finally {
if (getGrid().getDataProvider() != null) {
getGrid().getDataProvider().refreshAll();
}
}
}));
ComponentUtil.addListener(this, DeleteEvent.class,
(ComponentEventListener) ((ComponentEventListener>) e -> {
try {
deleteListeners.forEach(
listener -> listener.onComponentEvent(e));
setOpened(false);
getEditor().clear();
} finally {
getGrid().getDataProvider().refreshAll();
}
}));
}
/**
* Initiates an item edit from the server-side. This sets the supplied item
* as the working bean and opens the edit dialog.
*
* @param item
* the item to be edited
* @param editMode
* the edit mode
*/
public void edit(E item, EditMode editMode) {
final CrudEvent event;
if (editMode == EditMode.NEW_ITEM) {
event = new NewEvent<>(this, false, item, null);
} else {
setDirty(false);
event = new EditEvent<>(this, false, item);
}
setOpened(true);
ComponentUtil.fireEvent(this, event);
}
private void setClientIsNew(boolean isNew) {
getElement().setProperty("__isNew", isNew);
}
/**
* Opens or closes the editor. In most use cases opening or closing the
* editor is automatically done by the component and this method does not
* need to be called.
*
* @param opened
* true to open or false to close
*/
public void setOpened(boolean opened) {
getElement().callJsFunction("set", "editorOpened", opened);
}
/**
* Set the dirty state of the Crud.
*
* A dirty Crud has its editor Save button enabled. Ideally a Crud
* automatically detects if it is dirty based on interactions with the form
* fields within it but in some special cases (e.g with composites) this
* might not be automatically detected. For such cases this method could be
* used to explicitly set the dirty state of the Crud editor.
*
* NOTE: editor Save button will not be automatically enabled in case its
* enabled state was changed with {@link Crud#getSaveButton()}
*
* @param dirty
* true if dirty and false if otherwise.
* @see #getSaveButton()
*/
public void setDirty(boolean dirty) {
getElement().executeJs("this.set('__isDirty', $0)", dirty);
}
/**
* Gets the runtime bean type information
*
* @return the bean type
*/
public Class getBeanType() {
if (beanType == null) {
throw new IllegalStateException(
"The bean type must be initialized before event processing");
}
return beanType;
}
/**
* Sets the runtime bean type information. If no grid exists a built-in grid
* is created since the bean type information is now known. When injecting a
* {@link Crud} with {@literal @}Id this method must be called before the
* crud is put into use.
*
* @param beanType
* the bean type
*/
public void setBeanType(Class beanType) {
Objects.requireNonNull(beanType, "Bean type cannot be null");
this.beanType = beanType;
if (this.grid == null) {
setGrid(new CrudGrid<>(beanType, true, true));
}
}
/**
* Gets the grid
*
* @return the grid
*/
public Grid getGrid() {
if (grid == null) {
throw new IllegalStateException(
"The grid must be initialized before event processing");
}
return grid;
}
/**
* Sets the grid
*
* @param grid
* the grid
*/
public void setGrid(Grid grid) {
Objects.requireNonNull(grid, "Grid cannot be null");
if (this.grid != null
&& getElement().equals(this.grid.getElement().getParent())) {
this.grid.getElement().removeFromParent();
}
this.grid = grid;
grid.getElement().setAttribute("slot", "grid");
// It might already have a parent e.g when injected from a template
if (grid.getElement().getParent() == null) {
getElement().appendChild(grid.getElement());
}
}
/**
* Gets the crud editor.
*
* @return the crud editor
*/
public CrudEditor getEditor() {
if (editor == null) {
throw new IllegalStateException(
"The editor must be initialized before event processing");
}
return editor;
}
/**
* Sets the editor. When injecting a {@link Crud} with {@literal @}Id this
* method must be called before the crud is put into use.
*
* @param editor
* the editor
*/
public void setEditor(CrudEditor editor) {
Objects.requireNonNull(editor, "Editor cannot be null");
if (this.editor != null && this.editor.getView() != null && this.editor
.getView().getElement().getParent() == getElement()) {
this.editor.getView().getElement().removeFromParent();
}
this.editor = editor;
// It might already have a parent e.g when injected from a template
if (editor.getView() != null
&& editor.getView().getElement().getParent() == null) {
SlotUtils.addToSlot(this, "form", editor.getView());
}
}
/**
* Sets how editor will be presented on desktop screen.
*
* The default position is {@link CrudEditorPosition#OVERLAY}.
*
* @param editorPosition
* the editor position, never null
* @see CrudEditorPosition
*/
public void setEditorPosition(CrudEditorPosition editorPosition) {
if (editorPosition == null) {
throw new IllegalArgumentException(
"The 'editorPosition' argument can not be null");
}
getElement().setProperty("editorPosition",
editorPosition.getEditorPosition());
}
/**
* Gets the current editor position on the desktop screen.
*
* The default position is {@link CrudEditorPosition#OVERLAY}.
*
* @return the editor position
*/
public CrudEditorPosition getEditorPosition() {
return CrudEditorPosition.toPosition(
getElement().getProperty("editorPosition", ""),
CrudEditorPosition.OVERLAY);
}
private Registration gridItemClickRegistration;
/**
* Sets the option to open item to edit by row click.
*
* If enabled, it removes the edit column created by {@link CrudGrid}.
*
* @param editOnClick
* {@code true} to enable it ({@code false}, by default).
*/
public void setEditOnClick(boolean editOnClick) {
getElement().setProperty("editOnClick", editOnClick);
Grid grid = getGrid();
if (editOnClick) {
if (getGrid() instanceof CrudGrid) {
grid.setSelectionMode(Grid.SelectionMode.SINGLE);
if (hasEditColumn(grid)) {
removeEditColumn(grid);
}
}
gridItemClickRegistration = grid.addItemClickListener(
e -> this.gridActiveItem = e.getItem());
} else if (gridItemClickRegistration != null) {
clearActiveItem();
gridItemClickRegistration.remove();
if (grid instanceof CrudGrid) {
addEditColumn(grid);
grid.setSelectionMode(Grid.SelectionMode.NONE);
}
}
}
/**
* Gets whether click on row to edit item is enabled or not.
*
* @return {@code true} if enabled, {@code false} otherwise
*/
public boolean isEditOnClick() {
return getElement().getProperty("editOnClick", false);
}
private void clearActiveItem() {
this.gridActiveItem = null;
grid.deselectAll();
}
/**
* Sets the content of the toolbar.
*
* @param components
* the content to be set
*/
public void setToolbar(Component... components) {
SlotUtils.setSlot(this, "toolbar", components);
}
/**
* Sets the internationalized messages to be used by this crud instance.
*
* @param i18n
* the internationalized messages
* @see CrudI18n#createDefault()
*/
public void setI18n(CrudI18n i18n) {
setI18n(i18n, true);
}
private void setI18n(CrudI18n i18n, boolean fireEvent) {
getElement().setPropertyJson("i18n", JsonSerializer.toJson(i18n));
if (fireEvent) {
ComponentUtil.fireEvent(this.grid,
new CrudI18nUpdatedEvent(this, false, i18n));
}
}
/**
* Controls visiblity of toolbar
*
* @param value
*/
public void setToolbarVisible(boolean value) {
toolbarVisible = value;
if (value) {
getElement().setProperty("noToolbar", false);
} else {
getElement().setProperty("noToolbar", true);
}
}
/**
* Gets visiblity state of toolbar
*
* @param
* @return true if toolbar is visible false otherwise
*/
public boolean getToolbarVisible() {
return toolbarVisible;
}
/**
* Gets the Crud new item button
*
* @return the new item button
*/
public Component getNewButton() {
return newButton;
}
/**
* Sets the Crud new item button
*
* @param button
*/
public void setNewButton(Component button) {
newButton = button;
SlotUtils.setSlot(this, "new-button", button);
}
/**
* Gets the Crud editor delete button
*
* @return the delete button
*/
public Button getDeleteButton() {
return deleteButton;
}
/**
* Gets the Crud save button
*
* NOTE: State of the button set with
* {@link com.vaadin.flow.component.HasEnabled#setEnabled(boolean)} will
* remain even if dirty state of the crud changes
*
* @return the save button
* @see Crud#setDirty(boolean)
*/
public Button getSaveButton() {
return saveButton;
}
/**
* Gets the Crud cancel button
*
* @return the cancel button
*/
public Button getCancelButton() {
return cancelButton;
}
/**
* Adds theme variants to the component.
*
* @param variants
* theme variants to add
*/
public void addThemeVariants(CrudVariant... variants) {
List variantNames = variantNames(variants);
getThemeNames().addAll(variantNames);
if (grid instanceof CrudGrid) {
((CrudGrid) grid).addCrudThemeVariants(variantNames);
}
}
/**
* Removes theme variants from the component.
*
* @param variants
* theme variants to remove
*/
public void removeThemeVariants(CrudVariant... variants) {
List variantNames = variantNames(variants);
getThemeNames().removeAll(variantNames);
if (grid instanceof CrudGrid) {
((CrudGrid) grid).removeCrudThemeVariants(variantNames);
}
}
private static List variantNames(CrudVariant... variants) {
return Arrays.stream(variants).map(CrudVariant::getVariantName)
.collect(Collectors.toList());
}
/**
* Registers a listener to be notified when the user starts to create a new
* item.
*
* @param listener
* a listener to be notified
* @return a handle that can be used to unregister the listener
*/
public Registration addNewListener(
ComponentEventListener> listener) {
newListeners.add(listener);
return () -> newListeners.remove(listener);
}
/**
* Registers a listener to be notified when the user starts to edit an
* existing item.
*
* @param listener
* a listener to be notified
* @return a handle that can be used to unregister the listener
*/
public Registration addEditListener(
ComponentEventListener> listener) {
editListeners.add(listener);
return () -> editListeners.remove(listener);
}
/**
* Registers a listener to be notified when the user tries to save a new
* item or modifications to an existing item.
*
* @param listener
* a listener to be notified
* @return a handle that can be used to unregister the listener
*/
public Registration addSaveListener(
ComponentEventListener> listener) {
saveListeners.add(listener);
return () -> saveListeners.remove(listener);
}
/**
* Registers a listener to be notified when the user cancels a new item
* creation or existing item modification in progress.
*
* @param listener
* a listener to be notified
* @return a handle that can be used to unregister the listener
*/
public Registration addCancelListener(
ComponentEventListener> listener) {
cancelListeners.add(listener);
return () -> cancelListeners.remove(listener);
}
/**
* Registers a listener to be notified when the user tries to delete an
* existing item.
*
* @param listener
* a listener to be notified
* @return a handle that can be used to unregister the listener
*/
public Registration addDeleteListener(
ComponentEventListener> listener) {
deleteListeners.add(listener);
return () -> deleteListeners.remove(listener);
}
/**
* Gets the data provider supplying the grid data.
*
* @return the data provider for the grid
*/
public DataProvider getDataProvider() {
return grid.getDataProvider();
}
/**
* Sets the data provider for the grid.
*
* @param provider
* the data provider for the grid
*/
public void setDataProvider(DataProvider provider) {
grid.setDataProvider(provider);
}
/**
* A helper method to add an edit column to a grid. Clicking on the edit
* cell for a row opens the item for editing in the editor.
*
* @param grid
* the grid in which to add the edit column
* @see #addEditColumn(Grid, CrudI18n)
* @see #removeEditColumn(Grid)
* @see #hasEditColumn(Grid)
*/
public static void addEditColumn(Grid grid) {
addEditColumn(grid, CrudI18n.createDefault());
}
/**
* A helper method to add an edit column to a grid. Clicking on the edit
* cell for a row opens the item for editing in the editor. Additionally,
* the i18n object is used for setting the aria-label for the button,
* improving accessibility.
*
* @param grid
* the grid in which to add the edit column
* @param crudI18n
* the i18n object for localizing the accessibility of the edit
* column
*/
public static void addEditColumn(Grid grid, CrudI18n crudI18n) {
grid.addColumn(LitRenderer.of(createEditColumnTemplate(crudI18n)))
.setKey(EDIT_COLUMN_KEY).setWidth("4em").setFlexGrow(0);
}
private static String createEditColumnTemplate(CrudI18n crudI18n) {
return "
* the bean type
* @see com.vaadin.flow.component.crud.Crud#Crud(Class, CrudEditor)
* Crud(Class, CrudEditor)
*/
static abstract class CrudEvent extends ComponentEvent> {
/**
* Creates a new event using the given source and indicator whether the
* event originated from the client side or the server side.
*
* @param source
* the source component
* @param fromClient
* true if the event originated from the client
*/
private CrudEvent(Crud source, boolean fromClient) {
super(source, fromClient);
}
/**
* Gets the item being currently edited.
*
* @return the item being currently edited
*/
public E getItem() {
return getSource().getEditor().getItem();
}
}
/**
* Event fired when the user cancels the creation of a new item or
* modifications to an existing item.
*
* @param
* the bean type
*/
@DomEvent("cancel")
public static class CancelEvent extends CrudEvent {
/**
* Creates a new event using the given source and indicator whether the
* event originated from the client side or the server side.
*
* @param source
* the source component
* @param fromClient
* true if the event originated from the client
* @param ignored
* an ignored parameter for a side effect
*/
public CancelEvent(Crud source, boolean fromClient,
@EventData(EVENT_PREVENT_DEFAULT_JS) Object ignored) {
super(source, fromClient);
}
}
/**
* Event fired when the user tries to delete an existing item.
*
* @param
* the bean type
*/
@DomEvent("delete")
public static class DeleteEvent extends CrudEvent {
/**
* Creates a new event using the given source and indicator whether the
* event originated from the client side or the server side.
*
* @param source
* the source component
* @param fromClient
* true if the event originated from the client
* @param ignored
* an ignored parameter for a side effect
*/
public DeleteEvent(Crud source, boolean fromClient,
@EventData(EVENT_PREVENT_DEFAULT_JS) Object ignored) {
super(source, fromClient);
}
}
/**
* Event fired when the user starts to edit an existing item.
*
* @param
* the bean type
*/
@DomEvent("edit")
public static class EditEvent extends CrudEvent {
private E item;
/**
* Creates a new event using the given source and indicator whether the
* event originated from the client side or the server side.
*
* @param source
* the source component
* @param fromClient
* true if the event originated from the client
* @param item
* the item to be edited, provided in JSON as internally
* represented in Grid
* @param ignored
* an ignored parameter for a side effect
*/
public EditEvent(Crud source, boolean fromClient,
@EventData("event.detail.item") JsonObject item,
@EventData(EVENT_PREVENT_DEFAULT_JS) Object ignored) {
super(source, fromClient);
this.item = source.getGrid().getDataCommunicator().getKeyMapper()
.get(item.getString("key"));
}
private EditEvent(Crud source, boolean fromClient, E item) {
super(source, fromClient);
this.item = item;
}
@Override
public E getItem() {
return item;
}
}
/**
* Event fired when the user starts to create a new item.
*
* @param
* the bean type
*/
@DomEvent("new")
public static class NewEvent extends CrudEvent {
private E item;
/**
* Creates a new event using the given source and indicator whether the
* event originated from the client side or the server side.
*
* @param source
* the source component
* @param fromClient
* true if the event originated from the client
* @param ignored
* an ignored parameter for a side effect
*/
public NewEvent(Crud source, boolean fromClient,
@EventData(EVENT_PREVENT_DEFAULT_JS) Object ignored) {
super(source, fromClient);
}
/**
* Private constructor for server-initiated edits
*
* @param source
* the source component
* @param fromClient
* true if the event originated from the client
* @param item
* the item to be edited
* @param ignored
* only present to workaround Java generics erasure (since E
* also erases to Object and clashes with the other
* constructor)
*/
private NewEvent(Crud source, boolean fromClient, E item,
Object ignored) {
super(source, fromClient);
this.item = item;
}
/**
* Gets new item being created
*
* @return a new instance of bean type
*/
@Override
public E getItem() {
return item;
}
}
/**
* Event fired when the user tries to save a new item or modifications to an
* existing item.
*
* @param
* the bean type
*/
@DomEvent("save")
public static class SaveEvent extends CrudEvent {
/**
* Creates a new event using the given source and indicator whether the
* event originated from the client side or the server side.
*
* @param source
* the source component
* @param fromClient
* true if the event originated from the client
* @param ignored
* an ignored parameter for a side effect
*/
public SaveEvent(Crud source, boolean fromClient,
@EventData(EVENT_PREVENT_DEFAULT_JS) Object ignored) {
super(source, fromClient);
}
}
/**
* Determines whether an item presented for editing is to be treated as a
* new item or an existing item.
*
* @see Crud#edit(Object, EditMode)
*/
public enum EditMode {
/**
* The item presented for editing should be treated as a new item.
*/
NEW_ITEM,
/**
* The item presented for editing should be treated as an existing item.
*/
EXISTING_ITEM
}
}