Java tutorial
/* * Copyright 2013 JBoss 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 org.artificer.ui.client.local.services.notification; import javax.annotation.PostConstruct; import javax.enterprise.context.Dependent; import javax.inject.Inject; import org.artificer.ui.client.local.events.MouseInEvent; import org.artificer.ui.client.local.events.MouseOutEvent; import org.artificer.ui.client.shared.beans.NotificationType; import org.jboss.errai.ui.shared.api.annotations.DataField; import org.jboss.errai.ui.shared.api.annotations.Templated; import com.google.gwt.dom.client.Style.Unit; import com.google.gwt.event.logical.shared.AttachEvent; import com.google.gwt.event.logical.shared.AttachEvent.Handler; import com.google.gwt.event.shared.HandlerRegistration; import com.google.gwt.user.client.Event; import com.google.gwt.user.client.Event.NativePreviewEvent; import com.google.gwt.user.client.Event.NativePreviewHandler; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.FlowPanel; import com.google.gwt.user.client.ui.InlineLabel; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.Widget; /** * The UI for a single notification. This is a little growl window that * appears stacked on the bottom-right of the browser window, regardless of * the page. * * @author eric.wittmann@redhat.com */ @Templated("/org/artificer/ui/client/local/site/dialogs/growl-dialog.html#growl-dialog") @Dependent public class NotificationWidget extends Composite implements MouseInEvent.HasMouseInHandlers, MouseOutEvent.HasMouseOutHandlers { @Inject @DataField("growl-dialog-header-title") private Label title; @Inject @DataField("growl-dialog-header-closeButton") private Button closeButton; @Inject @DataField("growl-dialog-body") private FlowPanel body; private HandlerRegistration nativePreviewHandlerRegistration; private boolean mouseIn = false; /** * Constructor. */ public NotificationWidget() { } /** * Called after the widget is constructed. */ @PostConstruct protected void onPostConstruct() { addAttachHandler(new Handler() { @Override public void onAttachOrDetach(AttachEvent event) { if (event.isAttached()) { nativePreviewHandlerRegistration = Event.addNativePreviewHandler(new NativePreviewHandler() { @Override public void onPreviewNativeEvent(NativePreviewEvent event) { NotificationWidget.this.onPreviewNativeEvent(event); } }); } else { nativePreviewHandlerRegistration.removeHandler(); nativePreviewHandlerRegistration = null; } } }); } /** * Sets the notification title. * @param title */ public void setNotificationTitle(String title) { this.title.setText(title); } /** * Sets the notification message. * @param message * @param notificationType */ public void setNotificationMessage(String message, NotificationType notificationType) { this.body.clear(); InlineLabel msg = new InlineLabel(message); if (notificationType == NotificationType.notification) { this.body.add(msg); } else if (notificationType == NotificationType.warning) { this.body.add(msg); } else if (notificationType == NotificationType.error) { this.body.add(msg); } else if (notificationType == NotificationType.progress) { msg.addStyleName("spinner"); this.body.add(msg); } } /** * Sets the notification message. * @param message */ public void setNotificationMessage(Widget message) { this.body.clear(); this.body.add(message); } /** * Positions the notifiaction widget. * @param bottom * @param right */ public void positionBottom(int bottom, int right) { this.getElement().getStyle().setBottom(bottom, Unit.PX); this.getElement().getStyle().setRight(right, Unit.PX); } /** * @return the closeButton */ public Button getCloseButton() { return closeButton; } /** * Processes a native event so that we can track mouse movements in and * out of this widget. * @param event */ protected void onPreviewNativeEvent(NativePreviewEvent event) { if (event.getTypeInt() == Event.ONMOUSEMOVE) { int x = event.getNativeEvent().getClientX(); int y = event.getNativeEvent().getClientY(); handleMouseMove(x, y); } } /** * Called every time the mouse moves. This method tries to determine proper mouse-in and * mouse-out events. * @param clientX * @param clientY */ private void handleMouseMove(int clientX, int clientY) { if (isMouseInMe(clientX, clientY)) { if (this.mouseIn) { // do nothing } else { this.mouseIn = true; onMouseIn(); } } else { if (this.mouseIn) { onMouseOut(); this.mouseIn = false; } } } /** * Returns true if the given screen coordinates lie within the boundary of the growl dialog. * @param clientX * @param clientY */ private boolean isMouseInMe(int clientX, int clientY) { try { String bottomStyle = getElement().getStyle().getBottom(); int bottom = new Integer(bottomStyle.split("px")[0]).intValue(); bottom = Window.getClientHeight() - bottom; int top = bottom - getOffsetHeight(); int left = Window.getClientWidth() - NotificationConstants.WIDTH - NotificationConstants.MARGIN; int right = left + NotificationConstants.WIDTH; return clientX >= left && clientX <= right && clientY >= top && clientY <= bottom; } catch (Throwable t) { return false; } } /** * Called when the mouse enters the dialog. */ protected void onMouseIn() { addStyleName("growl-dialog-hover"); MouseInEvent.fire(this); } /** * Called when the mouse leaves the dialog. */ protected void onMouseOut() { removeStyleName("growl-dialog-hover"); MouseOutEvent.fire(this); } /** * @see org.artificer.ui.client.local.events.MouseOutEvent.HasMouseOutHandlers#addMouseOutHandler(org.artificer.ui.client.local.events.MouseOutEvent.Handler) */ @Override public HandlerRegistration addMouseOutHandler(MouseOutEvent.Handler handler) { return addHandler(handler, MouseOutEvent.getType()); } /** * @see org.artificer.ui.client.local.events.MouseInEvent.HasMouseInHandlers#addMouseInHandler(org.artificer.ui.client.local.events.MouseInEvent.Handler) */ @Override public HandlerRegistration addMouseInHandler(MouseInEvent.Handler handler) { return addHandler(handler, MouseInEvent.getType()); } }