/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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.
*
* For further information about Alkacon Software, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.gwt.client.ui.contextmenu;
import org.opencms.gwt.client.ui.CmsPopup;
import org.opencms.gwt.client.ui.I_CmsAutoHider;
import org.opencms.gwt.client.ui.css.I_CmsLayoutBundle;
import org.opencms.gwt.client.ui.input.CmsLabel;
import java.util.Iterator;
import java.util.List;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.event.logical.shared.ResizeEvent;
import com.google.gwt.event.logical.shared.ResizeHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FlowPanel;
/**
* A implementation for a context menu.<p>
*
* @since version 8.0.0
*/
public class CmsContextMenu extends Composite implements ResizeHandler, I_CmsAutoHider {
/** The menu auto hide parent. */
private I_CmsAutoHider m_autoHideParent;
/** A Flag indicating if the position of the menu should be fixed. */
private boolean m_isFixed;
/** The panel for the menu items. */
private FlowPanel m_panel = new FlowPanel();
/** The popup for a sub menu. */
private CmsPopup m_popup;
/** Stores the selected item. */
private A_CmsContextMenuItem m_selectedItem;
/**
* Constructor.<p>
*
* @param menuData the data structure for the context menu
* @param isFixed indicating if the position of the menu should be fixed.
* @param autoHideParent the menu auto hide parent
*/
public CmsContextMenu(List<I_CmsContextMenuEntry> menuData, boolean isFixed, I_CmsAutoHider autoHideParent) {
initWidget(m_panel);
m_isFixed = isFixed;
m_popup = new CmsPopup();
// clear the width and the padding of the popup content (needed for sub menus)
m_popup.setWidth(0);
m_popup.removePadding();
createContextMenu(menuData);
setStyleName(I_CmsLayoutBundle.INSTANCE.contextmenuCss().cmsMenuBar());
m_autoHideParent = autoHideParent;
}
/**
* @see org.opencms.gwt.client.ui.I_CmsAutoHider#addAutoHidePartner(com.google.gwt.dom.client.Element)
*/
public void addAutoHidePartner(com.google.gwt.dom.client.Element partner) {
m_autoHideParent.addAutoHidePartner(partner);
}
/**
* Adds a menu item to this menu.
*
* @param item the item to be added
*/
public void addItem(A_CmsContextMenuItem item) {
m_panel.add(item);
item.setParentMenu(this);
}
/**
* Adds a separator to this menu.<p>
*/
public void addSeparator() {
CmsLabel sparator = new CmsLabel();
sparator.setStyleName(I_CmsLayoutBundle.INSTANCE.contextmenuCss().menuItemSeparator());
m_panel.add(sparator);
}
/**
* @see org.opencms.gwt.client.ui.I_CmsAutoHider#hide()
*/
public void hide() {
m_autoHideParent.hide();
}
/**
* @see org.opencms.gwt.client.ui.I_CmsAutoHider#isAutoHideEnabled()
*/
public boolean isAutoHideEnabled() {
return m_autoHideParent.isAutoHideEnabled();
}
/**
* @see org.opencms.gwt.client.ui.I_CmsAutoHider#isAutoHideOnHistoryEventsEnabled()
*/
public boolean isAutoHideOnHistoryEventsEnabled() {
return m_autoHideParent.isAutoHideOnHistoryEventsEnabled();
}
/**
* If the browser's window is resized this method rearranges the sub menus of the selected item.<p>
*
* @see com.google.gwt.event.logical.shared.ResizeHandler#onResize(com.google.gwt.event.logical.shared.ResizeEvent)
*/
public void onResize(final ResizeEvent event) {
if ((m_selectedItem != null) && m_selectedItem.hasSubmenu()) {
Scheduler.get().scheduleDeferred(new ScheduledCommand() {
/**
* @see com.google.gwt.user.client.Command#execute()
*/
public void execute() {
getSelectedItem().getSubMenu().setSubMenuPosition(getSelectedItem());
getSelectedItem().getSubMenu().onResize(event);
}
});
}
}
/**
* @see org.opencms.gwt.client.ui.I_CmsAutoHider#removeAutoHidePartner(com.google.gwt.dom.client.Element)
*/
public void removeAutoHidePartner(com.google.gwt.dom.client.Element partner) {
m_autoHideParent.removeAutoHidePartner(partner);
}
/**
* @see org.opencms.gwt.client.ui.I_CmsAutoHider#setAutoHideEnabled(boolean)
*/
public void setAutoHideEnabled(boolean autoHide) {
m_autoHideParent.setAutoHideEnabled(autoHide);
}
/**
* @see org.opencms.gwt.client.ui.I_CmsAutoHider#setAutoHideOnHistoryEventsEnabled(boolean)
*/
public void setAutoHideOnHistoryEventsEnabled(boolean enabled) {
m_autoHideParent.setAutoHideOnHistoryEventsEnabled(enabled);
}
/**
* Returns the selected item of this menu.<p>
*
* @return the selected item of this menu
*/
protected A_CmsContextMenuItem getSelectedItem() {
return m_selectedItem;
}
/**
* Action on close.<p>
*
* On close all sub menus should be hidden, the currently selected item should be deselected
* and the popup will be closed.<p>
*/
protected void onClose() {
if ((m_selectedItem != null)) {
if (m_selectedItem.hasSubmenu()) {
m_selectedItem.getSubMenu().onClose();
}
m_selectedItem.deselectItem();
}
m_popup.hide();
}
/**
* Opens a sub menu and sets its position.<p>
*
* @param item the item to show the sub menu of
*/
protected void openPopup(final A_CmsContextMenuItem item) {
m_popup.add(item.getSubMenu());
m_popup.addAutoHidePartner(item.getElement());
m_popup.setModal(false);
m_popup.show();
setSubMenuPosition(item);
if (m_isFixed) {
m_popup.setPositionFixed();
}
}
/**
* Sets the selected item of this menu.<p>
*
* @param selectedItem the item to select
*/
protected void setSelectedItem(A_CmsContextMenuItem selectedItem) {
m_selectedItem = selectedItem;
}
/**
* Sets the position of the sub menu popup.<p>
*
* First calculates the best space where to show the popup.<p>
*
* The following list shows the possibilities, beginning
* with the best and ending with the worst.<p>
*
* <ul>
* <li>bottom-right</li>
* <li>bottom-left</li>
* <li>top-right</li>
* <li>top-left</li>
* </ul>
*
* Then the position (top and left coordinate) are calculated.<p>
*
* Finally the position of the sub menu popup is set to the calculated values.<p>
*
* @param item the item to show the sub menu of
*/
protected void setSubMenuPosition(final A_CmsContextMenuItem item) {
// calculate the left space
// add 10 because of the shadow and for avoiding that the browser's right window border touches the sub menu
int leftSpace = item.getAbsoluteLeft() - (Window.getScrollLeft() + 10);
// calculate the right space
// add 10 because of the shadow and for avoiding that the browser's left window border touches the sub menu
int rightSpace = Window.getClientWidth() - (item.getAbsoluteLeft() + item.getOffsetWidth() + 10);
// if the width of the sub menu is smaller than the right space, show the sub menu on the right
boolean showRight = item.getSubMenu().getOffsetWidth() < rightSpace;
if (!showRight) {
// if the width of the sub menu is larger than the right space, compare the left space with the right space
// and show the sub menu on the right if on the right is more space than on the left
showRight = leftSpace < rightSpace;
}
// calculate the top space
// add 10 because of the shadow and for avoiding that the browser's top window border touches the sub menu
int topSpace = item.getAbsoluteTop() - Window.getScrollTop() + 10;
// calculate the bottom space
// add 10 because of the shadow and for avoiding that the browser's bottom window border touches the sub menu
int bottomSpace = Window.getClientHeight() + Window.getScrollTop() - (item.getAbsoluteTop() + 10);
// if the height of the sub menu is smaller than the bottom space, show the sub menu on the bottom
boolean showBottom = item.getSubMenu().getOffsetHeight() < bottomSpace;
if (!showBottom) {
// if the height of the sub menu is larger than the bottom space, compare the top space with
// the bottom space and show the sub menu on the bottom if on the bottom is more space than on the top
showBottom = topSpace < bottomSpace;
}
int left;
int top;
if (showRight && showBottom) {
// bottom-right
// if to show the sub menu on the right the left coordinate is on the right end of the item, so take the
// item's absolute left and add the width of the item / by subtracting 4 the overlay it created
left = item.getAbsoluteLeft() + item.getOffsetWidth() - 4;
// if to show the sub menu on the bottom the top coordinate is on the top end of the item, so take the
// item's absolute top and subtract the scroll top of Window / by subtracting 4 the shadow is balanced
top = item.getAbsoluteTop() - Window.getScrollTop() - 4;
} else if (!showRight && showBottom) {
// bottom-left
// if to show the sub menu on the left, the left coordinate is on the left end of the item plus the width
// of the sub menu, so take the item's absolute left, subtract the sub menu's width and the scroll left
// by subtracting 4 the overlay it created
left = item.getAbsoluteLeft() - item.getSubMenu().getOffsetWidth() - Window.getScrollLeft() - 4;
// if to show the sub menu on the bottom the top coordinate is on the top end of the item, so take the
// item's absolute top and subtract the scroll top of Window / by subtracting 4 the shadow is balanced
top = item.getAbsoluteTop() - Window.getScrollTop() - 4;
} else if (showRight && !showBottom) {
// top-right
// if to show the sub menu on the right the left coordinate is on the right end of the item, so take the
// item's absolute left and add the width of the item / by subtracting 4 the overlay it created
left = item.getAbsoluteLeft() + item.getOffsetWidth() - 4;
// if to show the sub menu on the top, the bottom-left corner of the item plus the height of the sub menu
// is the top coordinate, so take the item's absolute top subtract the scroll top and the height of the sub
// menu and add the height of the item / by subtracting 4 the shadow is balanced
top = item.getAbsoluteTop()
- Window.getScrollTop()
- item.getSubMenu().getOffsetHeight()
+ item.getOffsetHeight()
- 4;
} else {
// top-left
// if to show the sub menu on the left, the left coordinate is on the left end of the item plus the width
// of the sub menu, so take the item's absolute left, subtract the sub menu's width and the scroll left
// by subtracting 4 the overlay it created
left = item.getAbsoluteLeft() - Window.getScrollLeft() - item.getSubMenu().getOffsetWidth() - 4;
// if to show the sub menu on the top, the bottom-left corner of the item plus the height of the sub menu
// is the top coordinate, so take the item's absolute top subtract the scroll top and the height of the sub
// menu and add the height of the item / by subtracting 4 the shadow is balanced
top = item.getAbsoluteTop()
- Window.getScrollTop()
- item.getSubMenu().getOffsetHeight()
+ item.getOffsetHeight()
- 4;
}
// finally set the position of the popup
m_popup.setPopupPosition(left, top);
}
/**
* Creates the context menu.<p>
*
* @param entries a list with all entries for the context menu
*/
private void createContextMenu(List<I_CmsContextMenuEntry> entries) {
Iterator<I_CmsContextMenuEntry> it = entries.iterator();
while (it.hasNext()) {
I_CmsContextMenuEntry entry = it.next();
if (!entry.isVisible()) {
continue;
}
if (entry.isSeparator()) {
addSeparator();
} else {
if (entry.hasSubMenu()) {
CmsContextMenuItem item = new CmsContextMenuItem(entry);
item.setSubMenu(new CmsContextMenu(entry.getSubMenu(), m_isFixed, m_popup));
addItem(item);
} else {
addItem(new CmsContextMenuItem(entry));
}
}
}
}
}