Java tutorial
/** * Sencha GXT 4.0.0 - Sencha for GWT * Copyright (c) 2006-2015, Sencha Inc. * * licensing@sencha.com * http://www.sencha.com/products/gxt/license/ * * ================================================================================ * Open Source License * ================================================================================ * This version of Sencha GXT is licensed under the terms of the Open Source GPL v3 * license. You may use this license only if you are prepared to distribute and * share the source code of your application under the GPL v3 license: * http://www.gnu.org/licenses/gpl.html * * If you are NOT prepared to distribute and share the source code of your * application under the GPL v3 license, other commercial and oem licenses * are available for an alternate download of Sencha GXT. * * Please see the Sencha GXT Licensing page at: * http://www.sencha.com/products/gxt/license/ * * For clarification or additional options, please contact: * licensing@sencha.com * ================================================================================ * * * ================================================================================ * Disclaimer * ================================================================================ * THIS SOFTWARE IS DISTRIBUTED "AS-IS" WITHOUT ANY WARRANTIES, CONDITIONS AND * REPRESENTATIONS WHETHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE * IMPLIED WARRANTIES AND CONDITIONS OF MERCHANTABILITY, MERCHANTABLE QUALITY, * FITNESS FOR A PARTICULAR PURPOSE, DURABILITY, NON-INFRINGEMENT, PERFORMANCE AND * THOSE ARISING BY STATUTE OR FROM CUSTOM OR USAGE OF TRADE OR COURSE OF DEALING. * ================================================================================ */ package com.sencha.gxt.widget.core.client.info; import java.util.Stack; import com.google.gwt.core.client.GWT; import com.google.gwt.dom.client.Document; import com.google.gwt.event.shared.HandlerRegistration; import com.google.gwt.safehtml.shared.SafeHtml; import com.google.gwt.safehtml.shared.SafeHtmlBuilder; import com.google.gwt.user.client.Timer; import com.google.gwt.user.client.ui.RootPanel; import com.sencha.gxt.core.client.Style.HideMode; import com.sencha.gxt.core.client.dom.XDOM; import com.sencha.gxt.core.client.dom.XElement; import com.sencha.gxt.core.client.util.Point; import com.sencha.gxt.core.client.util.Size; import com.sencha.gxt.widget.core.client.Component; /** * Displays a message in the bottom right region of the browser for a specified amount of time. */ public class Info extends Component { public abstract static interface InfoAppearance { XElement getContentElement(XElement parent); void render(SafeHtmlBuilder sb); } private static Stack<Info> infoCache = new Stack<Info>(); private static Stack<Info> topLeft = new Stack<Info>(); private static Stack<Info> topRight = new Stack<Info>(); private static Stack<Info> bottomLeft = new Stack<Info>(); private static Stack<Info> bottomRight = new Stack<Info>(); /** * Displays a message using the specified configuration * * @param config the info configuration */ public static void display(InfoConfig config) { pop().show(config); } /** * Displays a message with the given title and text. * * @param title the title as text * @param message the message as text */ public static void display(String title, String message) { display(new DefaultInfoConfig(title, message)); } /** * Displays a message with the given title and content. * * @param title the title as HTML * @param message the message as HTML */ public static void display(SafeHtml title, SafeHtml message) { display(new DefaultInfoConfig(title, message)); } private static Info pop() { Info info = infoCache.size() > 0 ? (Info) infoCache.pop() : null; if (info == null) { info = new Info(); } return info; } private static void push(Info info) { infoCache.push(info); } protected InfoConfig config; private InfoAppearance appearance; private HandlerRegistration showHandlerRegistration; private HandlerRegistration hideHandlerRegistration; /** * Creates a new info instance. */ public Info() { this((InfoAppearance) GWT.create(InfoAppearance.class)); } /** * Creates a new info appearance. * * @param appearance the info appearance */ public Info(InfoAppearance appearance) { this.appearance = appearance; setElement(Document.get().createDivElement()); setHideMode(HideMode.OFFSETS); } /** * Returns the appearance. * * @return the appearance */ public InfoAppearance getAppearance() { return appearance; } @Override public void hide() { super.hide(); afterHide(); } /** * Displays the info. * * @param config the info configuration. */ public void show(InfoConfig config) { this.config = config; if (showHandlerRegistration != null) { showHandlerRegistration.removeHandler(); showHandlerRegistration = null; } if (hideHandlerRegistration != null) { hideHandlerRegistration.removeHandler(); hideHandlerRegistration = null; } if (config.getShowHandler() != null) { showHandlerRegistration = addShowHandler(config.getShowHandler()); } if (config.getHideHandler() != null) { hideHandlerRegistration = addHideHandler(config.getHideHandler()); } onShowInfo(); } protected void afterHide() { RootPanel.get().remove(this); topLeft.remove(this); topRight.remove(this); bottomLeft.remove(this); bottomRight.remove(this); push(this); } protected void afterShow() { Timer t = new Timer() { public void run() { hide(); } }; t.schedule(config.getDisplay()); } protected void onShowInfo() { SafeHtmlBuilder sb = new SafeHtmlBuilder(); appearance.render(sb); getElement().setInnerSafeHtml(sb.toSafeHtml()); XElement target = appearance.getContentElement(getElement()); target.setInnerSafeHtml(config.render(this)); getElement().makePositionable(true); RootPanel.get().add(this); setWidth(config.getWidth()); setHeight(config.getHeight()); getElement().updateZIndex(0); Point p = position(); getElement().setLeftTop(p.getX(), p.getY()); show(); afterShow(); } protected Point position() { Size viewport = XDOM.getViewportSize(); int scrollLeft = XDOM.getBodyScrollLeft(); int scrollTop = XDOM.getBodyScrollTop(); int margin = config.getMargin(); int left = 0; int top = 0; switch (config.getPosition()) { case TOP_LEFT: if (topLeft.size() == 0) { left = margin + scrollLeft; top = margin; } else { Info prev = topLeft.peek(); top = prev.getAbsoluteTop() + prev.getOffsetHeight() + margin; left = prev.getAbsoluteLeft(); int bottom = top + getOffsetHeight(); if (bottom > viewport.getHeight()) { top = config.getMargin(); left = prev.getAbsoluteLeft() + config.getWidth() + margin + scrollLeft; } } topLeft.add(this); break; case TOP_RIGHT: if (topRight.size() == 0) { left = viewport.getWidth() - config.getWidth() - margin + scrollLeft; top = config.getMargin(); } else { Info prev = topRight.peek(); top = prev.getAbsoluteTop() + prev.getOffsetHeight() + margin; left = prev.getAbsoluteLeft(); int bottom = top + getOffsetHeight(); if (bottom > viewport.getHeight()) { top = margin; left = prev.getAbsoluteLeft() - config.getWidth() - margin + scrollLeft; } } topRight.add(this); break; case BOTTOM_LEFT: { int height = config.getHeight() == -1 ? getOffsetHeight() : config.getHeight(); if (bottomLeft.size() == 0) { top = viewport.getHeight() - height - margin + scrollTop; left = margin + scrollLeft; } else { Info prev = bottomLeft.peek(); left = prev.getAbsoluteLeft() + scrollLeft; top = prev.getAbsoluteTop() - height - margin; if (top < 0) { top = viewport.getHeight() - height - margin + scrollTop; left = prev.getAbsoluteLeft() + prev.getOffsetWidth() + margin + scrollLeft; } } bottomLeft.add(this); } break; case BOTTOM_RIGHT: { int height = config.getHeight() == -1 ? getOffsetHeight() : config.getHeight(); if (bottomRight.size() == 0) { top = viewport.getHeight() - height - margin - XDOM.getBodyScrollTop(); left = viewport.getWidth() - config.getWidth() - margin + scrollLeft - XDOM.getScrollBarWidth(); } else { Info prev = bottomRight.peek(); top = prev.getAbsoluteTop() - height - margin; left = prev.getAbsoluteLeft() + scrollLeft; if (top < 0) { top = viewport.getHeight() - height - margin + scrollTop; left = prev.getAbsoluteLeft() - prev.getOffsetWidth() - margin + scrollLeft; } } bottomRight.add(this); } break; } return new Point(left, top); } }