/**
* Sencha GXT 3.1.0-beta - Sencha for GWT
* Copyright(c) 2007-2014, Sencha, Inc.
* licensing@sencha.com
*
* http://www.sencha.com/products/gxt/license/
*/
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 text
* @param message the message 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);
}
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().setInnerHTML(sb.toSafeHtml().asString());
XElement target = appearance.getContentElement(getElement());
target.setInnerHTML(config.render(this).asString());
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);
}
}