com.google.gwt.user.client.Window Maven / Gradle / Ivy
/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.user.client;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.JavaScriptException;
import com.google.gwt.dom.client.Document;
import com.google.gwt.event.logical.shared.CloseEvent;
import com.google.gwt.event.logical.shared.CloseHandler;
import com.google.gwt.event.logical.shared.HasCloseHandlers;
import com.google.gwt.event.logical.shared.HasResizeHandlers;
import com.google.gwt.event.logical.shared.ResizeEvent;
import com.google.gwt.event.logical.shared.ResizeHandler;
import com.google.gwt.event.shared.EventHandler;
import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.http.client.URL;
import com.google.gwt.http.client.UrlBuilder;
import com.google.gwt.user.client.impl.WindowImpl;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* This class provides access to the browser window's methods, properties, and
* events.
*/
public class Window {
/**
* Fired just before the browser window closes or navigates to a different
* site.
*/
public static class ClosingEvent extends GwtEvent {
/**
* The event type.
*/
private static final Type TYPE = new Type();
static Type getType() {
return TYPE;
}
/**
* The message to display to the user to see whether they really want to
* leave the page.
*/
private String message = null;
@Override
public final Type getAssociatedType() {
return TYPE;
}
/**
* Get the message that will be presented to the user in a confirmation
* dialog that asks the user whether or not she wishes to navigate away from
* the page.
*
* @return the message to display to the user, or null
*/
public String getMessage() {
return message;
}
/**
* Set the message to a non-null value to present a
* confirmation dialog that asks the user whether or not she wishes to
* navigate away from the page. If multiple handlers set the message, the
* last message will be displayed; all others will be ignored.
*
* @param message the message to display to the user, or null
*/
public void setMessage(String message) {
this.message = message;
}
@Override
protected void dispatch(ClosingHandler handler) {
handler.onWindowClosing(this);
}
}
/**
* Handler for {@link Window.ClosingEvent} events.
*/
public interface ClosingHandler extends EventHandler {
/**
* Fired just before the browser window closes or navigates to a different
* site. No user-interface may be displayed during shutdown.
*
* @param event the event
*/
void onWindowClosing(Window.ClosingEvent event);
}
/**
* This class provides access to the browser's location's object. The location
* object contains information about the current URL and methods to manipulate
* it. Location is a very simple wrapper, so not all browser
* quirks are hidden from the user.
*/
public static class Location {
private static String cachedQueryString = "";
private static Map> listParamMap;
/**
* Assigns the window to a new URL. All GWT state will be lost.
*
* @param newURL the new URL
*/
public static native void assign(String newURL) /*-{
$wnd.location.assign(newURL);
}-*/;
/**
* Create a {@link UrlBuilder} based on this {@link Location}.
*
* @return the new builder
*/
public static UrlBuilder createUrlBuilder() {
UrlBuilder builder = new UrlBuilder();
builder.setProtocol(getProtocol());
builder.setHost(getHost());
String path = getPath();
if (path != null && path.length() > 0) {
builder.setPath(path);
}
String hash = getHash();
if (hash != null && hash.length() > 0) {
// Decode the hash now, because UrlBuilder.buildString() later encodes it.
builder.setHash(URL.decodeQueryString(hash));
}
String port = getPort();
if (port != null && port.length() > 0) {
builder.setPort(Integer.parseInt(port));
}
// Add query parameters.
Map> params = getParameterMap();
for (Map.Entry> entry : params.entrySet()) {
List values = new ArrayList(entry.getValue());
builder.setParameter(entry.getKey(),
values.toArray(new String[values.size()]));
}
return builder;
}
/**
* Gets the string to the right of the URL's hash.
*
* @return the string to the right of the URL's hash.
*/
public static String getHash() {
return impl.getHash();
}
/**
* Gets the URL's host and port name.
*
* @return the host and port name
*/
public static native String getHost() /*-{
return $wnd.location.host;
}-*/;
/**
* Gets the URL's host name.
*
* @return the host name
*/
public static native String getHostName() /*-{
return $wnd.location.hostname;
}-*/;
/**
* Gets the entire URL.
*
* @return the URL
*/
public static native String getHref() /*-{
return $wnd.location.href;
}-*/;
/**
* Gets the URL's parameter of the specified name. Note that if multiple
* parameters have been specified with the same name, the last one will be
* returned.
*
* @param name the name of the URL's parameter
* @return the value of the URL's parameter, or null if missing
*/
public static String getParameter(String name) {
ensureListParameterMap();
List paramsForName = listParamMap.get(name);
if (paramsForName == null) {
return null;
} else {
return paramsForName.get(paramsForName.size() - 1);
}
}
/**
* Returns an immutable Map of the URL query parameters for the host page
* at the time this method was called.
* Any changes to the window's location will be reflected in the result
* of subsequent calls.
*
* @return a map from URL query parameter names to a list of values
*/
public static Map> getParameterMap() {
ensureListParameterMap();
return listParamMap;
}
/**
* Gets the path to the URL.
*
* @return the path to the URL.
*/
public static native String getPath() /*-{
return $wnd.location.pathname;
}-*/;
/**
* Gets the URL's port.
*
* @return the URL's port
*/
public static native String getPort() /*-{
return $wnd.location.port;
}-*/;
/**
* Gets the URL's protocol.
*
* @return the URL's protocol.
*/
public static native String getProtocol() /*-{
return $wnd.location.protocol;
}-*/;
/**
* Gets the URL's query string.
*
* @return the URL's query string
*/
public static String getQueryString() {
return impl.getQueryString();
}
/**
* Reloads the current browser window. All GWT state will be lost.
*/
public static native void reload() /*-{
$wnd.location.reload();
}-*/;
/**
* Replaces the current URL with a new one. All GWT state will be lost. In
* the browser's history, the current URL will be replaced by the new URL.
*
* @param newURL the new URL
*/
public static native void replace(String newURL) /*-{
$wnd.location.replace(newURL);
}-*/;
/**
* Builds the immutable map from String to List that we'll return in
* getParameterMap(). Package-protected for testing.
*
* @return a map from the
*/
static Map> buildListParamMap(String queryString) {
Map> out = new HashMap>();
if (queryString != null && queryString.length() > 1) {
String qs = queryString.substring(1);
for (String kvPair : qs.split("&")) {
String[] kv = kvPair.split("=", 2);
String key = kv[0];
if (key.isEmpty()) {
continue;
}
String val = kv.length > 1 ? kv[1] : "";
try {
val = URL.decodeQueryString(val);
} catch (JavaScriptException e) {
GWT.log("Cannot decode a URL query string parameter=" + key +
" value=" + val, e);
}
List values = out.get(key);
if (values == null) {
values = new ArrayList();
out.put(key, values);
}
values.add(val);
}
}
for (Map.Entry> entry : out.entrySet()) {
entry.setValue(Collections.unmodifiableList(entry.getValue()));
}
out = Collections.unmodifiableMap(out);
return out;
}
private static void ensureListParameterMap() {
final String currentQueryString = getQueryString();
if (listParamMap == null ||
!cachedQueryString.equals(currentQueryString)) {
listParamMap = buildListParamMap(currentQueryString);
cachedQueryString = currentQueryString;
}
}
private Location() {
}
}
/**
* This class provides access to the browser's navigator object. The mimeTypes
* and plugins properties are not included.
*/
public static class Navigator {
/**
* Gets the navigator.appCodeName.
*
* @return the window's navigator.appCodeName.
*/
public static native String getAppCodeName() /*-{
return $wnd.navigator.appCodeName;
}-*/;
/**
* Gets the navigator.appName.
*
* @return the window's navigator.appName.
*/
public static native String getAppName() /*-{
return $wnd.navigator.appName;
}-*/;
/**
* Gets the navigator.appVersion.
*
* @return the window's navigator.appVersion.
*/
public static native String getAppVersion() /*-{
return $wnd.navigator.appVersion;
}-*/;
/**
* Gets the navigator.platform.
*
* @return the window's navigator.platform.
*/
public static native String getPlatform() /*-{
return $wnd.navigator.platform;
}-*/;
/**
* Gets the navigator.userAgent.
*
* @return the window's navigator.userAgent.
*/
public static native String getUserAgent() /*-{
return $wnd.navigator.userAgent;
}-*/;
/**
* Checks whether or not cookies are enabled or disabled.
*
* @return true if a cookie can be set, false if not
*/
public static boolean isCookieEnabled() {
return Cookies.isCookieEnabled();
}
/**
* Tests whether Java is enabled in the current browser.
*
* @return the window's navigator.javaEnabled.
*/
public static native boolean isJavaEnabled() /*-{
return $wnd.navigator.javaEnabled();
}-*/;
private Navigator() {
}
}
/**
* Fired when the browser window is scrolled.
*/
public static class ScrollEvent extends GwtEvent {
/**
* The event type.
*/
static final Type TYPE = new Type();
static Type getType() {
return TYPE;
}
private int scrollLeft;
private int scrollTop;
/**
* Construct a new {@link Window.ScrollEvent}.
*
* @param scrollLeft the left scroll position
* @param scrollTop the top scroll position
*/
private ScrollEvent(int scrollLeft, int scrollTop) {
this.scrollLeft = scrollLeft;
this.scrollTop = scrollTop;
}
@Override
public final Type getAssociatedType() {
return TYPE;
}
/**
* Gets the window's scroll left.
*
* @return window's scroll left
*/
public int getScrollLeft() {
return scrollLeft;
}
/**
* Get the window's scroll top.
*
* @return the window's scroll top
*/
public int getScrollTop() {
return scrollTop;
}
@Override
protected void dispatch(ScrollHandler handler) {
handler.onWindowScroll(this);
}
}
/**
* Handler for {@link Window.ScrollEvent} events.
*/
public interface ScrollHandler extends EventHandler {
/**
* Fired when the browser window is scrolled.
*
* @param event the event
*/
void onWindowScroll(Window.ScrollEvent event);
}
private static class WindowHandlers extends HandlerManager implements
HasCloseHandlers, HasResizeHandlers {
public WindowHandlers() {
super(null);
}
public HandlerRegistration addCloseHandler(CloseHandler handler) {
return addHandler(CloseEvent.getType(), handler);
}
public HandlerRegistration addResizeHandler(ResizeHandler handler) {
return addHandler(ResizeEvent.getType(), handler);
}
public HandlerManager getHandlers() {
return this;
}
}
// Package protected for testing.
static WindowHandlers handlers;
private static boolean closeHandlersInitialized;
private static boolean scrollHandlersInitialized;
private static boolean resizeHandlersInitialized;
private static int lastResizeWidth;
private static int lastResizeHeight;
private static final WindowImpl impl = GWT.create(WindowImpl.class);
/**
* Adds a {@link CloseEvent} handler.
*
* @param handler the handler
* @return returns the handler registration
*/
public static HandlerRegistration addCloseHandler(CloseHandler handler) {
maybeInitializeCloseHandlers();
return addHandler(CloseEvent.getType(), handler);
}
/**
* Adds a {@link ResizeEvent} handler.
*
* @param handler the handler
* @return returns the handler registration
*/
public static HandlerRegistration addResizeHandler(ResizeHandler handler) {
maybeInitializeCloseHandlers();
maybeInitializeResizeHandlers();
return addHandler(ResizeEvent.getType(), handler);
}
/**
* Adds a listener to receive window closing events.
*
* @param listener the listener to be informed when the window is closing
* @deprecated use {@link Window#addWindowClosingHandler(ClosingHandler)} and
* {@link Window#addCloseHandler(CloseHandler)} instead
*/
@Deprecated
public static void addWindowCloseListener(WindowCloseListener listener) {
BaseListenerWrapper.WrapWindowClose.add(listener);
}
/**
* Adds a {@link Window.ClosingEvent} handler.
*
* @param handler the handler
* @return returns the handler registration
*/
public static HandlerRegistration addWindowClosingHandler(
ClosingHandler handler) {
maybeInitializeCloseHandlers();
return addHandler(Window.ClosingEvent.getType(), handler);
}
/**
* Adds a listener to receive window resize events.
*
* @param listener the listener to be informed when the window is resized
* @deprecated use {@link Window#addResizeHandler(ResizeHandler)} instead
*/
@Deprecated
public static void addWindowResizeListener(WindowResizeListener listener) {
BaseListenerWrapper.WrapWindowResize.add(listener);
}
/**
* Adds a {@link Window.ScrollEvent} handler.
*
* @param handler the handler
* @return returns the handler registration
*/
public static HandlerRegistration addWindowScrollHandler(
Window.ScrollHandler handler) {
maybeInitializeCloseHandlers();
maybeInitializeScrollHandlers();
return addHandler(Window.ScrollEvent.getType(), handler);
}
/**
* Adds a listener to receive window scroll events.
*
* @param listener the listener to be informed when the window is scrolled
* @deprecated use {@link Window#addWindowScrollHandler(ScrollHandler)}
* instead
*/
@Deprecated
public static void addWindowScrollListener(WindowScrollListener listener) {
BaseListenerWrapper.WrapWindowScroll.add(listener);
}
/**
* Displays a message in a modal dialog box.
*
* @param msg the message to be displayed.
*/
public static native void alert(String msg) /*-{
$wnd.alert(msg);
}-*/;
/**
* Displays a message in a modal dialog box, along with the standard 'OK' and
* 'Cancel' buttons.
*
* @param msg the message to be displayed.
* @return true if 'OK' is clicked, false if
* 'Cancel' is clicked.
*/
public static native boolean confirm(String msg) /*-{
return $wnd.confirm(msg);
}-*/;
/**
* Use this method to explicitly disable the window's scrollbars. Applications
* that choose to resize their user-interfaces to fit within the window's
* client area will normally want to disable window scrolling.
*
* @param enable false to disable window scrolling
*/
public static void enableScrolling(boolean enable) {
Document.get().enableScrolling(enable);
}
/**
* Gets the height of the browser window's client area excluding the scroll
* bar.
*
* @return the window's client height
*/
public static int getClientHeight() {
return Document.get().getClientHeight();
}
/**
* Gets the width of the browser window's client area excluding the vertical
* scroll bar.
*
* @return the window's client width
*/
public static int getClientWidth() {
return Document.get().getClientWidth();
}
/**
* Gets the window's scroll left.
*
* @return window's scroll left
*/
public static int getScrollLeft() {
return Document.get().getScrollLeft();
}
/**
* Get the window's scroll top.
*
* @return the window's scroll top
*/
public static int getScrollTop() {
return Document.get().getScrollTop();
}
/**
* Gets the browser window's current title.
*
* @return the window's title.
*/
public static native String getTitle() /*-{
return $doc.title;
}-*/;
/**
* Moves a window's left and top edge to a specified number of pixels relative
* to its current coordinates.
*
* NOTE: In Chrome, this method only works with windows created by
* Window.open().
*
*
* @param dx A positive or a negative number that specifies how many pixels
* to move the left edge by
* @param dy A positive or a negative number that specifies how many
* pixels to move the top edge by
*/
public static native void moveBy(int dx, int dy) /*-{
$wnd.moveBy(dx, dy);
}-*/;
/**
* Moves a window's left and top edge to the specified coordinates.
*
* NOTE: In Chrome, this method only works with windows created by
* Window.open().
*
*
* @param x The left coordinate
* @param y The top coordinate
*/
public static native void moveTo(int x, int y) /*-{
$wnd.moveTo(x, y);
}-*/;
/**
* Opens a new browser window. The "name" and "features" arguments are
* specified here.
*
* @param url the URL that the new window will display
* @param name the name of the window (e.g. "_blank")
* @param features the features to be enabled/disabled on this window
*/
public static native void open(String url, String name, String features) /*-{
$wnd.open(url, name, features);
}-*/;
/**
* Prints the document in the window, as if the user had issued a "Print"
* command.
*/
public static native void print() /*-{
$wnd.print();
}-*/;
/**
* Displays a request for information in a modal dialog box, along with the
* standard 'OK' and 'Cancel' buttons.
*
* @param msg the message to be displayed
* @param initialValue the initial value in the dialog's text field
* @return the value entered by the user if 'OK' was pressed, or
* null if 'Cancel' was pressed
*/
public static native String prompt(String msg, String initialValue) /*-{
return $wnd.prompt(msg, initialValue);
}-*/;
/**
* Removes a window closing listener.
*
* @param listener the listener to be removed
*/
@Deprecated
public static void removeWindowCloseListener(WindowCloseListener listener) {
BaseListenerWrapper.WrapWindowClose.remove(handlers, listener);
}
/**
* Removes a window resize listener.
*
* @param listener the listener to be removed
*/
@Deprecated
public static void removeWindowResizeListener(WindowResizeListener listener) {
BaseListenerWrapper.WrapWindowResize.remove(handlers, listener);
}
/**
* Removes a window scroll listener.
*
* @param listener the listener to be removed
*/
@Deprecated
public static void removeWindowScrollListener(WindowScrollListener listener) {
BaseListenerWrapper.WrapWindowScroll.remove(handlers, listener);
}
/**
* Resizes the window by the specified width and height. This method moves the
* bottom right corner of the window by the specified number of pixels
* defined. The top left corner will not be moved (it stays in its original
* coordinates).
*
* NOTE: In most modern browsers, this method only works with windows created
* by Window.open() with a supplied width and height.
*
*
* @param width A positive or a negative number that specifies how many pixels
* to resize the width by
* @param height A positive or a negative number that specifies how many
* pixels to resize the height by
*/
public static native void resizeBy(int width, int height) /*-{
$wnd.resizeBy(width, height);
}-*/;
/**
* Resizes the window to the specified width and height.
*
* NOTE: In most modern browsers, this method only works with windows created
* by Window.open() with a supplied width and height.
*
*
* @param width The width of the window, in pixels
* @param height The height of the window, in pixels
*/
public static native void resizeTo(int width, int height) /*-{
$wnd.resizeTo(width, height);
}-*/;
/**
* Scroll the window to the specified position.
*
* @param left the left scroll position
* @param top the top scroll position
*/
public static native void scrollTo(int left, int top) /*-{
$wnd.scrollTo(left, top);
}-*/;
/**
* Sets the size of the margins used within the window's client area. It is
* sometimes necessary to do this because some browsers, such as Internet
* Explorer, add margins by default, which can confound attempts to resize
* panels to fit exactly within the window.
*
* @param size the window's new margin size, in CSS units.
*/
public static native void setMargin(String size) /*-{
$doc.body.style.margin = size;
}-*/;
/**
* Sets the status text for the window, if permitted by the browser's
* settings.
*
* @param status the new message to display.
*/
public static native void setStatus(String status) /*-{
$wnd.status = status;
}-*/;
/**
* Sets the browser window's title.
*
* @param title the new window title.
*/
public static native void setTitle(String title) /*-{
$doc.title = title;
}-*/;
static void onClosed() {
if (closeHandlersInitialized) {
CloseEvent.fire(getHandlers(), null);
}
}
static String onClosing() {
if (closeHandlersInitialized) {
Window.ClosingEvent event = new Window.ClosingEvent();
fireEvent(event);
return event.getMessage();
}
return null;
}
static void onResize() {
if (resizeHandlersInitialized) {
// On webkit and IE we sometimes get duplicate window resize events.
// Here, we manually filter them.
int width = getClientWidth();
int height = getClientHeight();
if (lastResizeWidth != width || lastResizeHeight != height) {
lastResizeWidth = width;
lastResizeHeight = height;
ResizeEvent.fire(getHandlers(), width, height);
}
}
}
static void onScroll() {
if (scrollHandlersInitialized) {
fireEvent(new Window.ScrollEvent(getScrollLeft(), getScrollTop()));
}
}
/**
* Adds this handler to the Window.
*
* @param the type of handler to add
* @param type the event type
* @param handler the handler
* @return {@link HandlerRegistration} used to remove the handler
*/
private static HandlerRegistration addHandler(
GwtEvent.Type type, final H handler) {
return getHandlers().addHandler(type, handler);
}
/**
* Fires an event.
*
* @param event the event
*/
private static void fireEvent(GwtEvent event) {
if (handlers != null) {
handlers.fireEvent(event);
}
}
private static WindowHandlers getHandlers() {
if (handlers == null) {
handlers = new WindowHandlers();
}
return handlers;
}
private static void maybeInitializeCloseHandlers() {
if (GWT.isClient() && !closeHandlersInitialized) {
impl.initWindowCloseHandler();
closeHandlersInitialized = true;
}
}
private static void maybeInitializeResizeHandlers() {
if (GWT.isClient() && !resizeHandlersInitialized) {
impl.initWindowResizeHandler();
resizeHandlersInitialized = true;
}
}
private static void maybeInitializeScrollHandlers() {
if (GWT.isClient() && !scrollHandlersInitialized) {
impl.initWindowScrollHandler();
scrollHandlersInitialized = true;
}
}
private Window() {
}
}