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/**
* Copyright (C) 2016 Premium Minds.
*
* This file is part of pm-wicket-utils.
*
* pm-wicket-utils is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* pm-wicket-utils is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with pm-wicket-utils. If not, see .
*/
package com.premiumminds.webapp.wicket.drawer;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Iterator;
import org.apache.wicket.MarkupContainer;
import org.apache.wicket.ajax.AjaxEventBehavior;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.attributes.AjaxRequestAttributes;
import org.apache.wicket.behavior.AttributeAppender;
import org.apache.wicket.markup.head.CssHeaderItem;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.JavaScriptHeaderItem;
import org.apache.wicket.markup.head.OnDomReadyHeaderItem;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.panel.EmptyPanel;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.model.Model;
import org.apache.wicket.request.resource.CssResourceReference;
import org.apache.wicket.request.resource.ResourceReference;
import org.apache.wicket.resource.JQueryPluginResourceReference;
/**
* A wicket drawer manager that allows stackable modals and supports AJAX-based opening and closing.
*
*/
public class DrawerManager extends Panel {
private static final long serialVersionUID = -352740762144075341L;
private static final ResourceReference DRAWER_JAVASCRIPT = new JQueryPluginResourceReference(DrawerManager.class, "bootstrap-modaldrawer.js");
private static final ResourceReference MANAGER_JAVASCRIPT = new JQueryPluginResourceReference(DrawerManager.class, "bootstrap-modalmanager.js");
private static final ResourceReference DRAWER_CSS = new CssResourceReference(DrawerManager.class, "bootstrap-modaldrawer.css");
private static class ListItem extends Panel {
private static final long serialVersionUID = 3805629765663003401L;
private WebMarkupContainer item;
private AbstractDrawer drawer;
private ListItem next;
private ListItem previous;
private DrawerManager manager;
public ListItem(String id, final AbstractDrawer drawer, DrawerManager drawerManager, String css) {
super(id);
setOutputMarkupId(true);
manager = drawerManager;
item = new WebMarkupContainer("item");
if (null != css) {
item.add(new AttributeAppender("class", Model.of(css), " "));
}
add(item);
this.drawer = drawer;
item.add(drawer);
add(new EmptyPanel("next").setOutputMarkupId(true));
item.add(new AjaxEventBehavior("hide-modal") {
private static final long serialVersionUID = -6423164614673441582L;
@Override
protected void onEvent(AjaxRequestTarget target) {
manager.eventPop(ListItem.this.drawer, target);
}
@Override
protected void updateAjaxAttributes(AjaxRequestAttributes attributes) {
super.updateAjaxAttributes(attributes);
attributes.setPreventDefault(true);
}
});
}
public void add(ListItem item) {
next = item;
addOrReplace(item);
item.previous = this;
}
}
private Deque drawers = new ArrayDeque();
private ListItem first;
public DrawerManager(String id) {
super(id);
add(new EmptyPanel("next").setOutputMarkupId(true));
}
/**
* Push and display a drawer on the page during page construction.
*
* Do not call this method during an AJAX request.
* Use {@link #push(AbstractDrawer drawer, AjaxRequestTarget target)} instead.
*
* @param drawer
* The drawer to be pushed. Cannot be null.
*/
public void push(AbstractDrawer drawer) {
push(drawer, null, null);
}
/**
* Push and display a drawer on the page during an AJAX request.
*
* @param drawer
* The drawer to be pushed. Cannot be null.
* @param target
* The current AJAX target.
*/
public void push(AbstractDrawer drawer, AjaxRequestTarget target) {
push(drawer, target, null);
}
/**
* Push and display a drawer on the page during page construction,
* and inject an optional CSS class onto the drawer's immediate container.
*
* Do not call this method during an AJAX request.
* Use {@link #push(AbstractDrawer drawer, AjaxRequestTarget target, String cssClass)} instead.
*
* @param drawer
* The drawer to be pushed. Cannot be null.
* @param cssClass
* The name of the class to be injected.
*/
public void push(AbstractDrawer drawer, String cssClass) {
push(drawer, null, cssClass);
}
/**
* Push and display a drawer on the page during an AJAX request,
* and inject an optional CSS class onto the drawer's immediate container.
*
* @param drawer
* The drawer to be pushed. Cannot be null.
* @param target
* The current AJAX target.
* @param cssClass
* The name of the class to be injected.
*/
public void push(AbstractDrawer drawer, AjaxRequestTarget target, String cssClass) {
ListItem item = new ListItem("next", drawer, this, cssClass);
drawers.push(item);
if (first == null) {
first = item;
addOrReplace(first);
} else {
ListItem iter = first;
while (iter.next != null) {
iter = iter.next;
}
iter.add(item);
}
if (target!=null) {
target.add(item);
target.appendJavaScript("$('#"+item.item.getMarkupId()+"').modaldrawer('show');");
if (item.previous!=null) {
target.appendJavaScript("$('#"+item.previous.item.getMarkupId()+"').removeClass('shown-modal');");
target.appendJavaScript("$('#"+item.previous.item.getMarkupId()+"').addClass('hidden-modal');");
}
}
drawer.setManager(this);
}
/**
* Pops a series of open drawers from the stack and closes them, displaying the one underneath, or the main page.
* This method requires an AJAX request. DrawerManager does not support closing drawers during page construction.
* Note that this code sets each drawer's allow close flag to true. See {@link AbstractDrawer} for more information.
*
* @param drawer
* The last drawer to be closed. This drawer and all the ones above it are closed.
* Open drawers beneath this one are not. If this parameter is null or not in the stack,
* all the drawers are closed.
* @param target
* The current AJAX target. Cannot be null.
*
*/
public void pop(AbstractDrawer drawer, AjaxRequestTarget target) {
Iterator iter = drawers.iterator();
while (iter.hasNext()) {
ListItem item = iter.next();
item.drawer.setAllowClose(true);
target.appendJavaScript("$('#"+item.item.getMarkupId()+"').modaldrawer('hide');");
if (item.drawer==drawer) {
break;
}
}
}
/**
* Replaces the topmost open drawer with a new one. If there is no open drawer, this method does nothing.
* This method requires an AJAX request. DrawerManager does not support swapping drawers during page construction.
*
* @param newDrawer
* The new drawer to open. Cannot be null.
* @param target
* The current AJAX target. Cannot be null.
*/
public void replaceLast(AbstractDrawer newDrawer, AjaxRequestTarget target) {
if (!drawers.isEmpty()) {
ListItem last = drawers.getFirst();
last.drawer.replaceWith(newDrawer);
last.drawer = newDrawer;
newDrawer.setManager(this);
target.add(newDrawer);
}
}
/**
* @param drawerClass
* The expected class of the topmost open drawer.
* @param drawer type
* @return
* A reference to the topmost open drawer, or null if there isn't one.
* If the topmost open drawer cannot be cast to the class in the first argument,
* a runtime class cast exception occurs.
*/
@SuppressWarnings("unchecked")
public T getLast(Class drawerClass) {
if (drawers.isEmpty()) {
return null;
}
ListItem last = drawers.getFirst();
return (T) last.drawer;
}
/**
* @return
* The wicket page relative path of the topmost open drawer, or null
* if there isn't an open drawer.
*/
public String getLastItemRelativePath() {
if (drawers.isEmpty()) {
return null;
}
ListItem last = drawers.getFirst();
return last.item.getPageRelativePath();
}
private void eventPop(AbstractDrawer drawer, AjaxRequestTarget target) {
ListItem item = null;
ListItem lastClosed = null;
// It's impossible for eventPop to be called with a drawer argument that's not in the stack.
// Thus, drawers.peek() is never null. - JMMM
do {
item = drawers.peek();
item.drawer.beforeClose(target);
if (!item.drawer.isAllowClose()) {
break;
}
lastClosed = drawers.pop();
internalPop(lastClosed, target);
} while (item.drawer != drawer);
if ((lastClosed != null) && (lastClosed.previous != null)) {
target.appendJavaScript("$('#"+lastClosed.previous.item.getMarkupId()+"').addClass('shown-modal');");
target.appendJavaScript("$('#"+lastClosed.previous.item.getMarkupId()+"').removeClass('hidden-modal');");
}
}
private void internalPop(ListItem item, AjaxRequestTarget target) {
target.appendJavaScript("$('#"+item.item.getMarkupId()+"').unbind('hide-modal');");
target.appendJavaScript("$('#"+item.item.getMarkupId()+"').data('modal-drawer').isShown=true;");
target.appendJavaScript("$('#"+item.item.getMarkupId()+"').modaldrawer('hide');");
target.appendJavaScript("$('#"+item.item.getMarkupId()+"').removeClass('shown-modal');");
if (item.previous == null) {
first = null;
removeDrawer(this, target);
} else {
item.previous.next = null;
removeDrawer(item.previous, target);
}
}
private void removeDrawer(MarkupContainer previous, AjaxRequestTarget target) {
Panel panel = new EmptyPanel("next");
panel.setOutputMarkupId(true);
previous.addOrReplace(panel);
target.add(panel);
}
//This script calls in this method are necessary to correctly respond to users
//pressing the Back button and landing on a page with open drawers.
@Override
public void renderHead(IHeaderResponse response) {
super.renderHead(response);
response.render(JavaScriptHeaderItem.forReference(DRAWER_JAVASCRIPT));
response.render(JavaScriptHeaderItem.forReference(MANAGER_JAVASCRIPT));
response.render(CssHeaderItem.forReference(DRAWER_CSS));
Iterator iter = drawers.descendingIterator();
WebMarkupContainer drawer;
while (iter.hasNext()) {
drawer=iter.next().item;
response.render(OnDomReadyHeaderItem.forScript("$('#"+drawer.getMarkupId()+"').modaldrawer('show');"));
if (drawers.getFirst().item.equals(drawer)) {
response.render(OnDomReadyHeaderItem.forScript("$('#"+drawer.getMarkupId()+"').addClass('shown-modal');"));
response.render(OnDomReadyHeaderItem.forScript("$('#"+drawer.getMarkupId()+"').removeClass('hidden-modal');"));
} else {
response.render(OnDomReadyHeaderItem.forScript("$('#"+drawer.getMarkupId()+"').removeClass('shown-modal');"));
response.render(OnDomReadyHeaderItem.forScript("$('#"+drawer.getMarkupId()+"').addClass('hidden-modal');"));
}
}
}
}
