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/*
* Copyright 2011 SWM Services GmbH.
*
* 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 de.swm.commons.mobile.client.widgets;
import com.google.gwt.editor.client.IsEditor;
import com.google.gwt.editor.client.adapters.TakesValueEditor;
import com.google.gwt.event.dom.client.*;
import com.google.gwt.event.logical.shared.HasValueChangeHandlers;
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.text.shared.Renderer;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.ui.*;
import de.swm.commons.mobile.client.SWMMobile;
import de.swm.commons.mobile.client.base.PanelBase;
import de.swm.commons.mobile.client.widgets.itf.IProvidesKeyAndValue;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
/**
* Listbox that supports data binding and internationalization
*
* @param the list box type
*/
public class DropDownList extends PanelBase implements FocusHandler, BlurHandler, ChangeHandler,
HasValueChangeHandlers, IsEditor>, HasConstrainedValue, HasFocusHandlers,
HasBlurHandlers, HasEnabled {
private final ListBox listBox = new ListBox();
private final Map indexKeyMap = new HashMap();
private final Map keyIndexMap = new HashMap();
private TakesValueEditor editor;
private IProvidesKeyAndValue keyValueProvider;
private Renderer renderer;
private int lastIndex = 0;
private T currentValue;
/**
* Default constructor.
*/
public DropDownList() {
super();
myFlowPanel.add(listBox);
if (!(SWMMobile.getOsDetection().isIOs())) {
myFlowPanel.add(new HTMLPanel(""));
myFlowPanel.add(new HTMLPanel(""));
myFlowPanel.add(new HTMLPanel(""));
}
setStyleName(SWMMobile.getTheme().getMGWTCssBundle().getDropDownCss().dropDownList());
listBox.addFocusHandler(this);
listBox.addBlurHandler(this);
listBox.addChangeHandler(this);
}
/**
* Clears the drop down list.
*/
public void clear() {
indexKeyMap.clear();
keyIndexMap.clear();
lastIndex = 0;
listBox.clear();
}
@Override
protected void onUnload() {
removeStyleName(SWMMobile.getTheme().getMGWTCssBundle().getDropDownCss().focus());
super.onUnload();
}
@Override
public void onFocus(FocusEvent event) {
addStyleName(SWMMobile.getTheme().getMGWTCssBundle().getDropDownCss().focus());
}
@Override
public void onBlur(BlurEvent event) {
removeStyleName(SWMMobile.getTheme().getMGWTCssBundle().getDropDownCss().focus());
}
@Override
public HandlerRegistration addBlurHandler(BlurHandler handler) {
return listBox.addBlurHandler(handler);
}
public void clearSelection() {
lastIndex = 0;
new Timer() {
@Override
public void run() {
listBox.setSelectedIndex(0);
}
}.schedule(100);
}
@Override
public HandlerRegistration addFocusHandler(FocusHandler handler) {
return listBox.addFocusHandler(handler);
}
@Override
public void onChange(ChangeEvent event) {
ValueChangeEvent.fire(this, getValue());
}
/**
* Sets the size of the Drop Down List
*/
public void setSize(String width, String height) {
listBox.setSize(width, height);
}
/**
* keyValueProvider the keyValueProvider to set.
*
* @param keyValueProvider the keyValueProvider to set
*/
public void setKeyValueProvider(IProvidesKeyAndValue keyValueProvider) {
this.keyValueProvider = keyValueProvider;
}
/**
* renderer the renderer to set.
*
* @param renderer the renderer to set
*/
public void setRenderer(Renderer renderer) {
this.renderer = renderer;
}
@Override
public void add(Widget w) {
assert w instanceof DropDownItem : "Can only contain DropDownItem in DropDownList.";
DropDownItem item = (DropDownItem) w;
if (keyValueProvider != null) {
// die idee ist, dass nur key's hinzgefuegt werden > das sind die auswahlbaren enum werte
if (this.keyValueProvider.getValue(item.getKey()) != null) {
T value = this.keyValueProvider.getValue(item.getKey());
this.keyIndexMap.put(item.getKey(), lastIndex);
this.indexKeyMap.put(lastIndex, item.getKey());
listBox.addItem(this.renderer != null ? this.renderer.render(value) : String.valueOf(value), item.getKey());
lastIndex++;
}
} else {
// support String as Type T (shortcut)
listBox.addItem(item.getText(), item.getKey());
}
}
public ListBox getListBox() {
return listBox;
}
/**
* Returns a {@link TakesValueEditor} backed by the ValueListBox.
*
* @return the value
*/
public TakesValueEditor asEditor() {
if (editor == null) {
editor = TakesValueEditor.of(this);
}
return editor;
}
@SuppressWarnings("unchecked")
@Override
public T getValue() {
int index = listBox.getSelectedIndex();
if (index >= 0) {
if (keyValueProvider != null) {
return this.keyValueProvider.getValue(this.indexKeyMap.get(index));
} else {
// support String as Type T (shortcut)
return (T) listBox.getValue(index);
}
}
return null;
}
@Override
public void setValue(T value) {
Integer indexToSelect = 0;
if (keyValueProvider != null) {
final String key = this.keyValueProvider.getKey(value);
if (key != null) {
indexToSelect = this.keyIndexMap.get(key);
}
} else {
// support String as Type T (shortcut)
String stringValue = (String) value;
for (int i = 0; i < listBox.getItemCount(); i++) {
if (listBox.getValue(i).equals(stringValue)) {
indexToSelect = i;
break;
}
}
}
listBox.setSelectedIndex(indexToSelect);
this.currentValue = value;
}
@Override
public void setValue(T value, boolean fireEvents) {
final T oldValue = currentValue;
setValue(value);
if (fireEvents) {
ValueChangeEvent.fireIfNotEqual(this, oldValue, value);
}
}
/**
* Will register a value change handler
*
* @param handler the handler to add.
* @return the registration handle.
*/
public HandlerRegistration addValueChangeHandler(ValueChangeHandler handler) {
return this.addHandler(handler, ValueChangeEvent.getType());
}
@Override
public void setAcceptableValues(Collection values) {
// intentionally left empty
}
@Override
public boolean isEnabled() {
return !DOM.getElementPropertyBoolean(listBox.getElement(), "disabled");
}
@Override
public void setEnabled(boolean enabled) {
DOM.setElementPropertyBoolean(listBox.getElement(), "disabled", !enabled);
}
}