Java tutorial
/* * This library is part of OpenCms - * the Open Source Content Management System * * Copyright (C) Alkacon Software (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; import org.opencms.ade.galleries.client.ui.CmsGalleryDialog; import org.opencms.gwt.client.ui.css.I_CmsLayoutBundle; import org.opencms.gwt.client.util.CmsPositionBean; import com.google.gwt.dom.client.Element; import com.google.gwt.dom.client.Style.Unit; import com.google.gwt.user.client.DOM; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.ButtonBase; /** * A popup which can be displayed below buttons in a toolbar. */ public class CmsToolbarPopup extends CmsPopup { /** The minimum distance of the popup to the window border. */ private static final int MIN_MARGIN = 8; /** The 'arrow-shaped' connector element above the popup. */ protected Element m_arrow = DOM.createDiv(); /** The toolbar button to which this popup belongs. */ protected ButtonBase m_button; /** The toolbar width. */ protected int m_toolbarWidth; /** The 'toolbar mode' flag. */ protected boolean m_isToolbarMode; /** The base element of the toolbar button. */ protected Element m_baseElement; /** * Creates a new toolbar popup.<p> * * @param button the toolbar button to which this popup belongs * @param toolbarMode the toolbar mode flag * @param baseElement the base element of the toolbar button */ public CmsToolbarPopup(ButtonBase button, boolean toolbarMode, Element baseElement) { super(); m_button = button; m_baseElement = baseElement; m_isToolbarMode = toolbarMode; setModal(false); setAutoHideEnabled(true); setWidth(DEFAULT_WIDTH); removePadding(); } /** * Calculates the popup height to use.<p> * * @return the height */ public static int getAvailableHeight() { int height = CmsGalleryDialog.DEFAULT_DIALOG_HEIGHT; if (Window.getClientHeight() > 590) { height = (int) Math.ceil((Window.getClientHeight() - 50) * 0.9); } return height; } /** * Calculates the popup width to use.<p> * * @return the width */ public static int getAvailableWidth() { int width = CmsGalleryDialog.DEFAULT_DIALOG_WIDTH; if (Window.getClientWidth() > 1100) { width = 1000; } return width; } /** * Positions the popup below the toolbar button.<p> */ public void position() { // get the window client width int windowWidth = Window.getClientWidth(); // get the min left position int minLeft = MIN_MARGIN; // get the max right position int maxRight = windowWidth - MIN_MARGIN; // get the middle button position CmsPositionBean buttonPosition = CmsPositionBean.generatePositionInfo(m_button.getElement()); int buttonMiddle = (buttonPosition.getLeft() - Window.getScrollLeft()) + (buttonPosition.getWidth() / 2); // get the content width int contentWidth = getOffsetWidth(); // the optimum left position is in the middle of the button minus the half content width // assume that the optimum fits into the space int contentLeft = buttonMiddle - (contentWidth / 2); if (minLeft > contentLeft) { // if the optimum left position of the popup is outside the min left position: // move the popup to the right (take the min left position as left) contentLeft = minLeft; } else if ((contentLeft + contentWidth) > maxRight) { // if the left position plus the content width is outside the max right position: // move the popup to the left (take the max right position minus the content width) contentLeft = maxRight - contentWidth; } // limit the right position if the popup is right outside the window if ((contentLeft + contentWidth + MIN_MARGIN) > windowWidth) { contentLeft = windowWidth - contentWidth - MIN_MARGIN; } // limit the left position if the popup is left outside the window if (contentLeft < MIN_MARGIN) { contentLeft = MIN_MARGIN; } int arrowSpace = 10; int arrowWidth = 40; int arrowHeight = 12; // the optimum position for the arrow is in the middle of the button int arrowLeft = buttonMiddle - contentLeft - (arrowWidth / 2); if ((arrowLeft + arrowWidth + arrowSpace) > contentWidth) { // limit the arrow position if the maximum is reached (content width 'minus x') arrowLeft = contentWidth - arrowWidth - arrowSpace; } else if ((arrowLeft - arrowSpace) < 0) { // limit the arrow position if the minimum is reached ('plus x') arrowLeft = arrowWidth + arrowSpace; } int arrowTop = -(arrowHeight - 2); String arrowClass = I_CmsLayoutBundle.INSTANCE.dialogCss().menuArrowTop(); int contentTop = (((buttonPosition.getTop() + buttonPosition.getHeight()) - Window.getScrollTop()) + arrowHeight) - 2; if (!m_isToolbarMode) { contentTop = (buttonPosition.getTop() + buttonPosition.getHeight() + arrowHeight) - 2; int contentHeight = getOffsetHeight(); int windowHeight = Window.getClientHeight(); if (((contentHeight + MIN_MARGIN) < windowHeight) && ((buttonPosition.getTop() - Window.getScrollTop()) > contentHeight) && (((contentHeight + MIN_MARGIN + contentTop) - Window.getScrollTop()) > windowHeight)) { // content fits into the window height, // there is enough space above the button // and there is to little space below the button // so show above contentTop = ((buttonPosition.getTop() - arrowHeight) + 2) - contentHeight; arrowTop = contentHeight - 1; arrowClass = I_CmsLayoutBundle.INSTANCE.dialogCss().menuArrowBottom(); } } else { contentLeft = contentLeft - Window.getScrollLeft(); setPositionFixed(); } m_arrow.setClassName(arrowClass); m_arrow.getStyle().setLeft(arrowLeft, Unit.PX); m_arrow.getStyle().setTop(arrowTop, Unit.PX); showArrow(m_arrow); setPopupPosition(contentLeft + Window.getScrollLeft(), contentTop); } /** * Sets the isToolbarMode.<p> * * @param isToolbarMode the isToolbarMode to set */ public void setToolbarMode(boolean isToolbarMode) { m_isToolbarMode = isToolbarMode; if (m_isToolbarMode) { // important, so a click on the button won't trigger the auto-close addAutoHidePartner(m_baseElement); } else { removeAutoHidePartner(m_baseElement); } } }