Java tutorial
/* * Copyright 2000-2018 Vaadin Ltd. * * 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.vaadin.client.ui.button; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.vaadin.client.MouseEventDetailsBuilder; import com.vaadin.client.VCaption; import com.vaadin.client.annotations.OnStateChange; import com.vaadin.client.ui.AbstractComponentConnector; import com.vaadin.client.ui.ConnectorFocusAndBlurHandler; import com.vaadin.client.ui.Icon; import com.vaadin.client.ui.VButton; import com.vaadin.shared.MouseEventDetails; import com.vaadin.shared.ui.Connect; import com.vaadin.shared.ui.Connect.LoadStyle; import com.vaadin.shared.ui.button.ButtonServerRpc; import com.vaadin.shared.ui.button.ButtonState; import com.vaadin.ui.Button; @Connect(value = Button.class, loadStyle = LoadStyle.EAGER) public class ButtonConnector extends AbstractComponentConnector implements ClickHandler { @Override public boolean delegateCaptionHandling() { return false; } @Override public void init() { super.init(); getWidget().addClickHandler(this); getWidget().client = getConnection(); ConnectorFocusAndBlurHandler.addHandlers(this); } @OnStateChange("resources") void onResourceChange() { if (getWidget().icon != null) { getWidget().wrapper.removeChild(getWidget().icon.getElement()); getWidget().icon = null; } Icon icon = getIcon(); if (icon != null) { getWidget().icon = icon; icon.setAlternateText(getState().iconAltText); getWidget().wrapper.insertBefore(icon.getElement(), getWidget().captionElement); } } @OnStateChange({ "caption", "captionAsHtml" }) void setCaption() { VCaption.setCaptionText(getWidget().captionElement, getState()); } @OnStateChange("iconAltText") void setIconAltText() { if (getWidget().icon != null) { getWidget().icon.setAlternateText(getState().iconAltText); } } @OnStateChange("clickShortcutKeyCode") void setClickShortcut() { getWidget().clickShortcut = getState().clickShortcutKeyCode; } @Override public VButton getWidget() { return (VButton) super.getWidget(); } @Override public ButtonState getState() { return (ButtonState) super.getState(); } @Override public void onClick(ClickEvent event) { if (getState().disableOnClick) { // Simulate getting disabled from the server without waiting for the // round trip. The server-side RPC handler takes care of updating // the server-side state in a similar way to ensure subsequent // changes are properly propagated. Changing state on client is not // generally supported. getState().enabled = false; super.updateEnabledState(false); getRpcProxy(ButtonServerRpc.class).disableOnClick(); } // Add mouse details MouseEventDetails details = MouseEventDetailsBuilder.buildMouseEventDetails(event.getNativeEvent(), getWidget().getElement()); getRpcProxy(ButtonServerRpc.class).click(details); } }