Java tutorial
/* * Copyright 2010 Daniel Kurka * * 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.googlecode.mgwt.ui.client.widget.input.search; import com.google.gwt.core.client.Scheduler; import com.google.gwt.core.client.Scheduler.ScheduledCommand; import com.google.gwt.core.shared.GWT; import com.google.gwt.event.dom.client.KeyCodes; import com.google.gwt.event.dom.client.KeyUpEvent; import com.google.gwt.event.dom.client.KeyUpHandler; import com.google.gwt.event.logical.shared.ValueChangeEvent; import com.google.gwt.event.logical.shared.ValueChangeHandler; import com.google.gwt.event.shared.HandlerRegistration; import com.google.gwt.uibinder.client.UiFactory; import com.google.gwt.uibinder.client.UiField; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.FormPanel; import com.google.gwt.user.client.ui.FormPanel.SubmitEvent; import com.google.gwt.user.client.ui.FormPanel.SubmitHandler; import com.google.gwt.user.client.ui.HasName; import com.google.gwt.user.client.ui.HasText; import com.google.gwt.user.client.ui.HasValue; import com.google.gwt.user.client.ui.TextBox; import com.googlecode.mgwt.dom.client.event.tap.TapEvent; import com.googlecode.mgwt.dom.client.event.tap.TapHandler; import com.googlecode.mgwt.ui.client.MGWT; import com.googlecode.mgwt.ui.client.widget.base.HasPlaceHolder; import com.googlecode.mgwt.ui.client.widget.button.ButtonBase; /** * A search widget * * @author Daniel Kurka Date: 30.05.2010 */ public class MSearchBox extends Composite implements HasText, HasName, HasValue<String>, HasPlaceHolder { public static class MSearchBoxButton extends ButtonBase { public MSearchBoxButton() { this(DEFAULT_APPEARANCE); } public MSearchBoxButton(MSearchBoxAppearance appearance) { super(appearance); setElement(appearance.uiBinder().createAndBindUi(this)); } } private class SearchBoxChangeHandler implements KeyUpHandler { @Override public void onKeyUp(KeyUpEvent event) { if (!MGWT.getFormFactor().isDesktop()) { if (textBox.getValue().length() > 0) { clearButton.setVisible(true); } else { clearButton.setVisible(false); } } } } private static final MSearchBoxAppearance DEFAULT_APPEARANCE = GWT.create(MSearchBoxAppearance.class); @UiField public TextBox textBox; @UiField public ButtonBase clearButton; @UiField public FormPanel form; private HandlerRegistration clearButtonHandler; private HandlerRegistration boxHandler; private MSearchBoxAppearance appearance; public MSearchBox() { this(DEFAULT_APPEARANCE); } public MSearchBox(MSearchBoxAppearance appearance) { this.appearance = appearance; initWidget(this.appearance.uiBinderBox().createAndBindUi(this)); form.addSubmitHandler(new SubmitHandler() { @Override public void onSubmit(SubmitEvent event) { event.cancel(); } }); textBox.getElement().setAttribute("autocapitalize", "off"); textBox.getElement().setAttribute("autocorrect", "off"); textBox.getElement().setAttribute("type", "search"); setPlaceHolder("Search"); textBox.addKeyUpHandler(new KeyUpHandler() { @Override public void onKeyUp(KeyUpEvent event) { if (event.getNativeKeyCode() == KeyCodes.KEY_ENTER) { fireEvent(new SearchSubmitEvent(getValue())); return; } Scheduler.get().scheduleDeferred(new ScheduledCommand() { @Override public void execute() { ValueChangeEvent.fire(MSearchBox.this, getValue()); } }); } }); setValue(""); } public HandlerRegistration addSearchSubmitHandler(SearchSubmitHandler handler) { return addHandler(handler, SearchSubmitEvent.getType()); } public HandlerRegistration addSearchClearHandler(SearchClearHandler handler) { return addHandler(handler, SearchClearEvent.getType()); } @Override protected void onAttach() { super.onAttach(); clearButtonHandler = clearButton.addTapHandler(new TapHandler() { @Override public void onTap(TapEvent event) { clearSearchField(); } }); boxHandler = textBox.addKeyUpHandler(new SearchBoxChangeHandler()); } @Override protected void onDetach() { super.onDetach(); clearButtonHandler.removeHandler(); boxHandler.removeHandler(); } @Override public void setPlaceHolder(String text) { textBox.getElement().setAttribute("placeholder", text); } private void clearSearchField() { textBox.setValue("", false); clearButton.setVisible(false); fireEvent(new SearchClearEvent()); ValueChangeEvent.fire(this, ""); } @Override public String getPlaceHolder() { return textBox.getElement().getAttribute("placeholder"); } @Override public String getText() { return textBox.getText(); } @Override public void setText(String text) { textBox.setText(text); } @Override public HandlerRegistration addValueChangeHandler(ValueChangeHandler<String> handler) { return addHandler(handler, ValueChangeEvent.getType()); } @Override public void setName(String name) { textBox.setName(name); } @Override public String getName() { return textBox.getName(); } @Override public String getValue() { return textBox.getValue(); } @Override public void setValue(String value) { setValue(value, false); } @Override public void setValue(String value, boolean fireEvents) { textBox.setValue(value, false); if (value == null || "".equals(value)) { clearButton.setVisible(false); } if (fireEvents) { ValueChangeEvent.fire(this, getValue()); } } @UiFactory public MSearchBoxAppearance getAppearance() { return appearance; } }