使用实用程序方法编译代码时是否可以避免弃用警告：
public static void doSthForHorizontalSplitPanel(HorizontalSplitPanel hsp) {...}
并明确声明和/或创建HorizontalSplitPanel小部件，例如：
protected HorizontalSplitPanel main;
...
main = new HorizontalSplitPanel();
我的目标是消除这些警告而不删除HorizontalSplitPanel用法，不借助最小的手动重构来提供全局编译器标记（-Xlint:-deprecation）和 在使用HorizontalSplitPanel和我的实用程序方法对代码可能产生的影响方面（即代码变化尽可能少）。
方法或类级别的注释@SuppressWarnings("deprecation")似乎不起作用，因为import HorizontalSplitPanel语句，在一个选项中替换已弃用的HorizontalSplitPanel类（暂时）。
我的目标是否可以实现？如果是这样，最好的方法是什么？
我使用的是NetBeans 7.1，Java 1.6，GWT 2.3。
答案 0 :(得分：3)
标准模式和SplitlayoutPanel比不推荐使用的HorizontalSplitPanel效果更好。 尝试使用HorizontalSplitLayoutPanel替换为HorizontalSplitPanel的代码。 此代码实际使用最新的SplitLayoutPanel，方法等同于Deprecated HorizontalSplitPanel。优点是您无需更改代码。还粘贴了VerticalSplitPanel备用VerticalSplitLayoutPanel的代码。 VerticalSplitLayoutPanel经过单元测试，工作正常。
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.ScrollPanel;
import com.google.gwt.user.client.ui.SplitLayoutPanel;
import com.google.gwt.user.client.ui.Widget;
/**
* author: MKK
* Date: 4/29/13
* Time: 10:41 AM
* /**
*
* GWT depecrated HorizontalSplitpanel as of version 2.0.
* This is a wrapper class which extends new SplitLayoutPanel and has all the methods of deprecated old Splitpanels for
* seamless integration with existing code without breaking.
* Replacement of old HorizontalSplitLayoutPanel with new SplitLayoutPanel
*
*
*/
public class HorizontalSplitLayoutPanel extends SplitLayoutPanel{
private ScrollPanel leftScrollPanel = new ScrollPanel();
private ScrollPanel rightScrollPanel = new ScrollPanel();
private Widget leftWidget;
private Widget rightWidget;
public HorizontalSplitLayoutPanel(){
super();
init();
}
boolean dragged;
public void onBrowserEvent(Event event) {
super.onBrowserEvent(event);
switch (DOM.eventGetType(event)) {
case Event.ONMOUSEDOWN:
dragged = true;
break;
case Event.ONMOUSEUP:
dragged = false;
break;
case Event.ONMOUSEMOVE:
break;
}
}
public boolean isResizing(){
return dragged;
}
private void init() {
setSize("100%", "100%");
addWest(leftScrollPanel, 300);
add(rightScrollPanel);
sinkEvents(Event.ONMOUSEDOWN | Event.ONMOUSEUP );
}
public HorizontalSplitLayoutPanel(int splitterSize) {
super(splitterSize);
init();
}
public void setLeftWidget(Widget widget){
this.leftWidget = widget;
leftScrollPanel.clear();
leftScrollPanel.add(widget);
setSplitPosition("30%");
setWidgetToggleDisplayAllowed(leftScrollPanel,true);
}
public void setRightWidget(Widget widget){
try {
this.rightWidget = widget;
rightScrollPanel.clear();
rightScrollPanel.add(widget);
setSplitPosition("30%");
} catch (Exception e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
}
public void removeWidget(Widget widget){
try {
if( leftScrollPanel.getWidget()== widget){
leftScrollPanel.remove(widget);
return;
}
rightScrollPanel.remove(widget);
} catch (Exception e) {
}
}
public void setSplitPosition(String percent){
if( percent.toLowerCase().indexOf("px") > -1){
percent = percent.replace("px","").trim();
int p = Integer.parseInt(percent);
setSplitPosition(p);
return;
}
percent = percent.replace("%","").trim();
int p = Integer.parseInt(percent);
double size = (getOffsetWidth()*p)/100.0;
if( p < 1.0 ){
size = 600;
}
setWidgetSize(leftScrollPanel, size);
}
public void setSplitPosition(int pixels){
setWidgetSize(leftScrollPanel, pixels);
}
public void hideLeftWidget() {
leftScrollPanel.clear();
setWidgetMinSize(leftScrollPanel,0);
}
public void showLeftWidget(){
leftScrollPanel.add(leftWidget);
}
public void hideRightWidget() {
rightScrollPanel.clear();
setWidgetMinSize(rightScrollPanel,0);
}
public void showRightWidget(){
rightScrollPanel.add(rightWidget);
}
}
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.ScrollPanel;
import com.google.gwt.user.client.ui.SplitLayoutPanel;
import com.google.gwt.user.client.ui.Widget;
/**
*
* GWT depecrated VerticalSplitPanel as of version 2.0.
* This is a wrapper class which extends new SplitLayoutPanel and has all the methods of deprecated old Splitpanels for
* seamless integration with existing code without breaking.
* Replacement of old VerticalSplitPanel with new SplitLayoutPanel
*
*
*/
public class VerticalSplitLayoutPanel extends SplitLayoutPanel {
private Widget topWidget;
private Widget bottomWidget;
private int offset=100;
private ScrollPanel topScrollPanel = new ScrollPanel();
private ScrollPanel bottomScrollPanel = new ScrollPanel();
public VerticalSplitLayoutPanel() {
super();
init();
}
public VerticalSplitLayoutPanel(int splitterSize) {
super(splitterSize);
init();
}
private void init() {
setSize("100%", "100%");
//int clientH = Window.getClientHeight()-offset;
// double size = clientH * 50/100;
addNorth(topScrollPanel, getOffsetHeight()/2.0);
add(bottomScrollPanel);
sinkEvents(Event.ONMOUSEDOWN | Event.ONMOUSEUP );
}
boolean dragged;
public void onBrowserEvent(Event event) {
super.onBrowserEvent(event);
switch (DOM.eventGetType(event)) {
case Event.ONMOUSEDOWN:
dragged = true;
break;
case Event.ONMOUSEUP:
dragged = false;
break;
case Event.ONMOUSEMOVE:
break;
}
}
public boolean isResizing(){
return dragged;
}
public void setTopWidget(Widget widget){
topScrollPanel.add(widget);
}
public void setBottomWidget(Widget widget){
bottomScrollPanel.add(widget);
}
public void removeWidget(Widget widget){
try {
if( topScrollPanel.getWidget()== widget){
topScrollPanel.remove(widget);
return;
}
bottomScrollPanel.remove(widget);
} catch (Exception e) {
}
}
public void setSplitPosition(String percent){
if( percent.toLowerCase().indexOf("px") > -1){
percent = percent.replace("px","").trim();
int p = Integer.parseInt(percent);
setSplitPosition(p);
return;
}
percent = percent.replace("%","").trim();
int p = Integer.parseInt(percent);
int oH = getOffsetHeight();
if( oH == 0 ){
oH = (Window.getClientHeight()-offset);
}
double h = (oH*p)/100.0;
setWidgetSize(topScrollPanel, h);
}
public void setSplitPosition(int pixels){
setWidgetSize(topScrollPanel, pixels);
}
public void setOffset(int size){
this.offset = size;
}
}
答案 1 :(得分：1)
我的方法如下。
将HorizontalSplitPanel的每次使用替换为下面定义的HorizontalSplitPanelWrapper，然后修复导入 - 这将取消import HorizontalSplitPanel并添加import HorizontalSplitPanelWrapper。完成。
@SuppressWarnings("deprecation")
public class HorizontalSplitPanelWrapper implements IsWidget {
private Panel hsp = new com.google.gwt.user.client.ui.HorizontalSplitPanel();
public Widget asWidget() {
return hsp;
}
public com.google.gwt.user.client.Element getElement() {
return hsp.getElement();
}
public <H extends EventHandler> HandlerRegistration addHandler(final H handler, GwtEvent.Type<H> type) {
return hsp.addHandler(handler, type);
}
public boolean isResizing() {
return ((com.google.gwt.user.client.ui.HorizontalSplitPanel) hsp).isResizing();
}
public void setWidth(String width) {
hsp.setWidth(width);
}
public void setSplitPosition(String pos) {
((com.google.gwt.user.client.ui.HorizontalSplitPanel) hsp).setSplitPosition(pos);
}
public void add(IsWidget w) {
hsp.add(w);
}
}
补充说明。
我的解决方案使用来自GWT的IsWidget接口的小技巧 - 这可以最大限度地减少代码影响，因为Widget可以在大多数GTW API调用中用IsWidget的实现代替。
我的代码中使用的HorizontalSplitPanel的每个方法现在都由HorizontalSplitPanelWrapper实现，并且只被委托给hsp字段存储的内部HorizontalSplitPanel。
对于HorizontalSplitPanel，类型/ param / result必须没有声明字段和方法，因为无论@SuppressWarnings("deprecation")如何，它都会产生弃用警告。因此，hsp字段被声明为Panel。
如果在其余代码中使用了更多HorizontalSplitPanel方法，则HorizontalSplitPanelWrapper中的每个方法都必须有伪委托方法。必须从字段hsp中检索正确的HorizontalSplitPanel对象，并在每个此类方法中使用显式强制转换。
就是这样。由于仍然可以使用HorizontalSplitPanel，不再有弃用警告。