Java tutorial
/* * Copyright 2011 Vancouver Ywebb Consulting 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. * -------- * This class contains modified sources from gwtmobile-ui project. * * Copyright (c) 2010 Zhihua (Dennis) Jiang * * 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 next.i.view.widgets; import java.util.ArrayList; import next.i.XStyle; import next.i.mobile.DragController; import next.i.mobile.DragEvent; import next.i.mobile.DragEventsHandler; import next.i.mobile.SelectionChangedEvent; import next.i.mobile.SelectionChangedHandler; import next.i.view.MPanelBase; import com.google.gwt.core.client.Scheduler; import com.google.gwt.core.client.Scheduler.ScheduledCommand; import com.google.gwt.dom.client.Element; import com.google.gwt.dom.client.EventTarget; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; 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.user.client.DOM; import com.google.gwt.user.client.Event; import com.google.gwt.user.client.ui.CheckBox; import com.google.gwt.user.client.ui.HasWidgets; /** * <p> * <img class='ai' src='../../../../resources/XCheckboxGroup.png' /> * </p> */ public class XCheckboxGroup extends MPanelBase implements HasWidgets, ClickHandler, DragEventsHandler, ValueChangeHandler<Boolean> { // private int _pressed = -1; public XCheckboxGroup() { this(false); } public XCheckboxGroup(boolean isVertical) { super(); sinkEvents(Event.ONCLICK | Event.ONTOUCHCANCEL | Event.ONTOUCHEND | Event.ONTOUCHMOVE | Event.ONTOUCHSTART); addDomHandler(this, ClickEvent.getType()); setStyleName(XStyle.xcheckboxGroup.name()); setVertical(isVertical); } @Override public void onBrowserEvent(Event e) { e.stopPropagation(); super.onBrowserEvent(e); } @Override public void onLoad() { super.onLoad(); DragController.get().addDragEventsHandler(this); } @Override protected void onUnload() { super.onUnload(); DragController.get().removeDragEventsHandler(this); } public HandlerRegistration addSelectionChangedHandler(SelectionChangedHandler handler) { return this.addHandler(handler, SelectionChangedEvent.TYPE); } @Override public void onClick(ClickEvent e) { final EventTarget target = e.getNativeEvent().getEventTarget(); String targetTagName = ((Element) target.cast()).getTagName().toUpperCase(); //XLog.warn("onClick target=" + target + " targetTagName=" + targetTagName); if (targetTagName.equals("LABEL")) { return; // if check box label is click, another (simulated) click event // with // check box INPUT as target will fire after this one. So this click event // can be safely ignored. } Element div = Element.as(target); while (!div.getNodeName().toUpperCase().equals("SPAN") || div.getParentElement() != this.getElement()) { div = div.getParentElement(); if (div == null) { // XLog.info("XCheckboxGroup onClick: span not found"); return; } } final int index = DOM.getChildIndex(this.getElement(), (com.google.gwt.user.client.Element) div); CheckBox checkbox = (CheckBox) _panel.getWidget(index); // XLog.info("onClick " + checkbox.getValue()); if (targetTagName.equals("INPUT")) { // XLog.info("onClick value changed"); checkbox.setValue(checkbox.getValue()); // if target is check box INPUT, // check box value is // already changed when click event is fired. // just need to set its current value back to the check box // to update style. } else { checkbox.setValue(!checkbox.getValue()); } Scheduler.get().scheduleDeferred(new ScheduledCommand() { @Override public void execute() { SelectionChangedEvent selectionChangedEvent = new SelectionChangedEvent(index, target); fireEvent(selectionChangedEvent); } }); } public ArrayList<Integer> getCheckedIndices() { int count = _panel.getWidgetCount(); ArrayList<Integer> checkedList = new ArrayList<Integer>(count); for (int i = 0; i < count; i++) { XCheckbox c = (XCheckbox) _panel.getWidget(i); if (c.getValue()) { checkedList.add(i); } } return checkedList; } public ArrayList<XCheckbox> getCheckedWidgets() { int count = _panel.getWidgetCount(); ArrayList<XCheckbox> checkedList = new ArrayList<XCheckbox>(count); for (int i = 0; i < count; i++) { XCheckbox c = (XCheckbox) _panel.getWidget(i); if (c.getValue()) { checkedList.add(c); } } return checkedList; } public void add(XCheckbox... checkBoxs) { if (checkBoxs != null) { for (XCheckbox c : checkBoxs) { // add(c); _panel.add(c); c.addValueChangeHandler(this); } } } public void setVertical(boolean vertical) { if (vertical) { addStyleName(XStyle.vertical.name()); removeStyleName(XStyle.horizontal.name()); } else { addStyleName(XStyle.horizontal.name()); removeStyleName(XStyle.vertical.name()); } } @Override public void onValueChange(ValueChangeEvent<Boolean> event) { // FIXME ??? // XLog.info("onValueChange " + event.getValue() + " " + // event.getSource().getClass()); } @Override public void onDragStart(DragEvent e) { // _pressed = Utils.getTargetItemIndex(getElement(), // e.getNativeEvent().getEventTarget()); // if (_pressed >= 0) { // Widget item = getWidget(_pressed); // item.addStyleName("Pressed"); // } } @Override public void onDragMove(DragEvent e) { // if (_pressed >= 0) { // Widget item = getWidget(_pressed); // item.removeStyleName("Pressed"); // _pressed = -1; // } } @Override public void onDragEnd(DragEvent e) { // onDragMove(e); } @Override public void onDragMoveHorizontal(DragEvent e) { // Not implemented } @Override public void onDragMoveVertical(DragEvent e) { // Not implemented } }