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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.client.ui;
-
- import com.google.gwt.dom.client.Element;
- import com.google.gwt.dom.client.Style.Position;
- import com.google.gwt.dom.client.Style.Unit;
- import com.google.gwt.dom.client.Style.Visibility;
- import com.google.gwt.user.client.DOM;
- import com.google.gwt.user.client.ui.ComplexPanel;
- import com.google.gwt.user.client.ui.Widget;
- import com.vaadin.client.ui.TouchScrollDelegate.TouchScrollHandler;
-
- /**
- * A panel that displays all of its child widgets in a 'deck', where only one
- * can be visible at a time. It is used by
- * {@link com.vaadin.client.ui.VTabsheet}.
- *
- * This class has the same basic functionality as the GWT DeckPanel
- * {@link com.google.gwt.user.client.ui.DeckPanel}, with the exception that it
- * doesn't manipulate the child widgets' width and height attributes.
- */
- public class VTabsheetPanel extends ComplexPanel {
-
- private Widget visibleWidget;
-
- private final TouchScrollHandler touchScrollHandler;
-
- /**
- * Creates an empty tabsheet panel.
- */
- public VTabsheetPanel() {
- setElement(DOM.createDiv());
- touchScrollHandler = TouchScrollDelegate.enableTouchScrolling(this);
- }
-
- /**
- * Adds the specified widget to the deck.
- *
- * @param w
- * the widget to be added
- */
- @Override
- public void add(Widget w) {
- Element el = createContainerElement();
- DOM.appendChild(getElement(), el);
- super.add(w, el);
- }
-
- private Element createContainerElement() {
- Element el = DOM.createDiv();
- el.getStyle().setPosition(Position.ABSOLUTE);
- hide(el);
- touchScrollHandler.addElement(el);
- return el;
- }
-
- /**
- * Gets the index of the currently-visible widget.
- *
- * @return the visible widget's index
- */
- public int getVisibleWidget() {
- return getWidgetIndex(visibleWidget);
- }
-
- /**
- * Inserts a widget before the specified index.
- *
- * @param w
- * the widget to be inserted
- * @param beforeIndex
- * the index before which it will be inserted
- * @throws IndexOutOfBoundsException
- * if <code>beforeIndex</code> is out of range
- */
- public void insert(Widget w, int beforeIndex) {
- Element el = createContainerElement();
- DOM.insertChild(getElement(), el, beforeIndex);
- super.insert(w, el, beforeIndex, false);
- }
-
- @Override
- public boolean remove(Widget w) {
- Element child = w.getElement();
- Element parent = null;
- if (child != null) {
- parent = DOM.getParent(child);
- }
- final boolean removed = super.remove(w);
- if (removed) {
- if (visibleWidget == w) {
- visibleWidget = null;
- }
- if (parent != null) {
- DOM.removeChild(getElement(), parent);
- }
- touchScrollHandler.removeElement(parent);
- }
- return removed;
- }
-
- /**
- * Shows the widget at the specified index. This causes the currently-
- * visible widget to be hidden.
- *
- * @param index
- * the index of the widget to be shown
- */
- public void showWidget(int index) {
- checkIndexBoundsForAccess(index);
- Widget newVisible = getWidget(index);
- if (visibleWidget != newVisible) {
- if (visibleWidget != null) {
- hide(DOM.getParent(visibleWidget.getElement()));
- }
- visibleWidget = newVisible;
- touchScrollHandler
- .setElements(visibleWidget.getElement().getParentElement());
- }
- // Always ensure the selected tab is visible. If server prevents a tab
- // change we might end up here with visibleWidget == newVisible but its
- // parent is still hidden.
- unHide(DOM.getParent(visibleWidget.getElement()));
- }
-
- private void hide(Element e) {
- e.getStyle().setVisibility(Visibility.HIDDEN);
- e.getStyle().setTop(-100000, Unit.PX);
- e.getStyle().setLeft(-100000, Unit.PX);
- }
-
- private void unHide(Element e) {
- e.getStyle().setTop(0, Unit.PX);
- e.getStyle().setLeft(0, Unit.PX);
- e.getStyle().clearVisibility();
- }
-
- public void fixVisibleTabSize(int width, int height, int minWidth) {
- if (visibleWidget == null) {
- return;
- }
-
- boolean dynamicHeight = false;
-
- if (height < 0) {
- height = visibleWidget.getOffsetHeight();
- dynamicHeight = true;
- }
- if (width < 0) {
- width = visibleWidget.getOffsetWidth();
- }
- if (width < minWidth) {
- width = minWidth;
- }
-
- Element wrapperDiv = visibleWidget.getElement().getParentElement();
-
- // width first
- getElement().getStyle().setPropertyPx("width", width);
- wrapperDiv.getStyle().setPropertyPx("width", width);
-
- if (dynamicHeight) {
- // height of widget might have changed due wrapping
- height = visibleWidget.getOffsetHeight();
- }
- // v-tabsheet-tabsheetpanel height
- getElement().getStyle().setPropertyPx("height", height);
-
- // widget wrapper height
- if (dynamicHeight) {
- wrapperDiv.getStyle().clearHeight();
- } else {
- // widget wrapper height
- wrapperDiv.getStyle().setPropertyPx("height", height);
- }
- }
-
- public void replaceComponent(Widget oldComponent, Widget newComponent) {
- boolean isVisible = (visibleWidget == oldComponent);
- int widgetIndex = getWidgetIndex(oldComponent);
- remove(oldComponent);
- insert(newComponent, widgetIndex);
- if (isVisible) {
- showWidget(widgetIndex);
- }
- }
- }
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