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- /*
- * Copyright 2000-2018 Vaadin Ltd.
- *
- * Licensed under the Apache License, Version 2.0 (the "License"); you may not
- * use this file except in compliance with the License. You may obtain a copy of
- * the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations under
- * the License.
- */
-
- package com.vaadin.ui;
-
- import java.util.Collection;
- import java.util.Objects;
-
- import org.jsoup.nodes.Attributes;
- import org.jsoup.nodes.Element;
-
- import com.vaadin.data.HasValue;
- import com.vaadin.shared.AbstractFieldState;
- import com.vaadin.shared.Registration;
- import com.vaadin.ui.Component.Focusable;
- import com.vaadin.ui.declarative.DesignAttributeHandler;
- import com.vaadin.ui.declarative.DesignContext;
-
- /**
- * An abstract implementation of a field, or a {@code Component} allowing user
- * input. Implements {@link HasValue} to represent the input value. Examples of
- * typical field components include text fields, date pickers, and check boxes.
- * <p>
- * This class replaces the Vaadin 7 {@code com.vaadin.ui.AbstractField} class.
- * The old {@code AbstractField} is retained, under the new name
- * {@link com.vaadin.v7.ui.AbstractField}, for compatibility and migration
- * purposes.
- *
- * @author Vaadin Ltd.
- * @since 8.0
- *
- * @param <T>
- * the input value type
- */
- public abstract class AbstractField<T> extends AbstractComponent
- implements HasValue<T>, Focusable {
-
- @Override
- public void setValue(T value) {
- setValue(value, false);
- }
-
- @Override
- public boolean isReadOnly() {
- return super.isReadOnly();
- }
-
- /**
- * {@inheritDoc}
- * <p>
- * The server ignores (potentially forged) value change requests from the
- * client to fields that are read-only. Programmatically changing the field
- * value via {@link #setValue(T)} is still possible.
- * <p>
- * The read-only mode is distinct from the
- * {@linkplain Component#setEnabled(boolean) disabled} state. When disabled,
- * a component cannot be interacted with at all, and its content should be
- * considered irrelevant or not applicable. In contrast, the user should
- * still be able to read the content and otherwise interact with a read-only
- * field even though changing the value is disallowed.
- *
- * @param readOnly
- * {@code true} to set read-only mode, {@code false} otherwise.
- */
- @Override
- public void setReadOnly(boolean readOnly) {
- super.setReadOnly(readOnly);
- }
-
- @Override
- public Registration addValueChangeListener(
- ValueChangeListener<T> listener) {
- return addListener(ValueChangeEvent.class, listener,
- ValueChangeListener.VALUE_CHANGE_METHOD);
- }
-
- @Override
- public void readDesign(Element design, DesignContext designContext) {
- super.readDesign(design, designContext);
- Attributes attr = design.attributes();
- if (attr.hasKey("readonly")) {
- setReadOnly(DesignAttributeHandler.readAttribute("readonly", attr,
- Boolean.class));
- }
- }
-
- @Override
- public void writeDesign(Element design, DesignContext designContext) {
- super.writeDesign(design, designContext);
- AbstractField<T> def = designContext.getDefaultInstance(this);
- Attributes attr = design.attributes();
- DesignAttributeHandler.writeAttribute("readonly", attr, isReadOnly(),
- def.isReadOnly(), Boolean.class, designContext);
- }
-
- @Override
- protected Collection<String> getCustomAttributes() {
- Collection<String> attributes = super.getCustomAttributes();
- attributes.add("readonly");
- // must be handled by subclasses
- attributes.add("value");
- return attributes;
- }
-
- /**
- * Sets the value of this field if it has changed and fires a value change
- * event. If the value originates from the client and this field is
- * read-only, does nothing. Invokes {@link #doSetValue(Object) doSetValue}
- * to actually store the value.
- *
- * @param value
- * the new value to set
- * @param userOriginated
- * {@code true} if this event originates from the client,
- * {@code false} otherwise.
- * @return <code>true</code> if the value was updated, <code>false</code>
- * otherwise
- */
- protected boolean setValue(T value, boolean userOriginated) {
- if (userOriginated && isReadOnly()) {
- return false;
- }
- if (!isDifferentValue(value)) {
- return false;
- }
- T oldValue = this.getValue();
- doSetValue(value);
- if (!userOriginated) {
- markAsDirty();
- }
- fireEvent(createValueChange(oldValue, userOriginated));
-
- return true;
- }
-
- /**
- * Called when a new value is set to determine whether the provided new
- * value is considered to be a change compared to the current value. This is
- * used to determine whether {@link #doSetValue(Object)} should be called
- * and a value change event fired.
- *
- * @param newValue
- * the new value candidate to check, may be <code>null</code>
- *
- * @return <code>true</code> if the provided value is considered to be
- * different and a value change event should be fired;
- * <code>false</code> if the values are considered to be the same
- * and no value change should be fired
- */
- protected boolean isDifferentValue(T newValue) {
- return !Objects.equals(newValue, getValue());
- }
-
- /**
- * Sets the value of this field. May do sanitization or throw
- * {@code IllegalArgumentException} if the value is invalid. Typically saves
- * the value to shared state.
- *
- * @param value
- * the new value of the field
- * @throws IllegalArgumentException
- * if the value is invalid
- */
- protected abstract void doSetValue(T value);
-
- /**
- * Returns a new value change event instance.
- *
- * @param oldValue
- * the value of this field before this value change event
- * @param userOriginated
- * {@code true} if this event originates from the client,
- * {@code false} otherwise.
- * @return the new event
- */
- protected ValueChangeEvent<T> createValueChange(T oldValue,
- boolean userOriginated) {
- return new ValueChangeEvent<>(this, oldValue, userOriginated);
- }
-
- @Override
- protected AbstractFieldState getState() {
- return (AbstractFieldState) super.getState();
- }
-
- @Override
- protected AbstractFieldState getState(boolean markAsDirty) {
- return (AbstractFieldState) super.getState(markAsDirty);
- }
-
- @Override
- public void focus() {
- super.focus();
- }
-
- @Override
- public int getTabIndex() {
- return getState(false).tabIndex;
- }
-
- @Override
- public void setTabIndex(int tabIndex) {
- getState().tabIndex = tabIndex;
- }
-
- @Override
- public void setRequiredIndicatorVisible(boolean visible) {
- super.setRequiredIndicatorVisible(visible);
- }
-
- @Override
- public boolean isRequiredIndicatorVisible() {
- return super.isRequiredIndicatorVisible();
- }
- }
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