試圖讓一個按鈕顯示測試學習，沒有紅旗錯誤，只是混亂？

Question

使用GXT和Java試圖學習。只需通過eclipse進行測試，我就可以看到一個空白頁面沒有按鈕，我使用了sencha中的按鈕示例，並且它顯示在那裏，然後當我採取我迄今爲止學到的必要操作時，仍然無法生成單個文本按鈕。

package com.custom.test.client; 

import com.google.gwt.core.client.EntryPoint; 
import com.google.gwt.core.client.GWT; 
import com.google.gwt.user.client.ui.HorizontalPanel; 
import com.google.gwt.user.client.ui.VerticalPanel; 
import com.sencha.gxt.cell.core.client.ButtonCell.ButtonScale; 
import com.sencha.gxt.core.client.resources.ThemeStyles; 
import com.sencha.gxt.widget.core.client.ContentPanel; 
import com.sencha.gxt.widget.core.client.ContentPanel.ContentPanelAppearance; 
import com.sencha.gxt.widget.core.client.FramedPanel.FramedPanelAppearance; 
import com.sencha.gxt.widget.core.client.box.AlertMessageBox; 
import com.sencha.gxt.widget.core.client.button.CellButtonBase; 

/** 
* Entry point classes define <code>onModuleLoad()</code>. 
*/ 
public class Test implements EntryPoint { 
    @Override 
    public void onModuleLoad() { 
     VerticalPanel vp = new VerticalPanel(); 
     ContentPanel cp = new ContentPanel(); 
     vp.setSpacing(10); 
     vp.setWidth("400px"); 
     HorizontalPanel hp = new HorizontalPanel(); 
     hp.setSpacing(5); 
     Buttons b = new Buttons(); 
     CellButtonBase<?> small = b.createButton(Buttons.Category.NORMAL, Buttons.Type.TEXT); 
     b.configureButton(small, Buttons.Type.TEXT, ButtonScale.SMALL); 
     hp.add(small); 
     vp.add(hp); 
     cp = new ContentPanel(GWT.<ContentPanelAppearance> create(FramedPanelAppearance.class)); 
     cp.addStyleName("margin-10"); 
     cp.setPixelSize(500, 400); 
     cp.getBody().getStyle().setBackgroundColor("white"); 
     cp.getBody().addClassName(ThemeStyles.getStyle().border()); 
     cp.add(vp); 
     cp.show(); 
    } 
} 

Answer 1

不知道這是需要的，但試試這個

cp.add(b); 

？也許 ？

編輯：

package com.custom.test.client; 

import com.google.gwt.core.client.EntryPoint; 
import com.google.gwt.core.client.GWT; 
import com.google.gwt.user.client.ui.HorizontalPanel; 
import com.google.gwt.user.client.ui.VerticalPanel; 
import com.sencha.gxt.cell.core.client.ButtonCell.ButtonScale; 
import com.sencha.gxt.core.client.resources.ThemeStyles; 
import com.sencha.gxt.widget.core.client.ContentPanel; 
import com.sencha.gxt.widget.core.client.ContentPanel.ContentPanelAppearance; 
import com.sencha.gxt.widget.core.client.FramedPanel.FramedPanelAppearance; 
import com.sencha.gxt.widget.core.client.box.AlertMessageBox; 
import com.sencha.gxt.widget.core.client.button.CellButtonBase; 

/** 
* Entry point classes define <code>onModuleLoad()</code>. 
*/ 
public class Test implements EntryPoint { 
    @Override 
    public void onModuleLoad() { 
     VerticalPanel vp = new VerticalPanel(); 
     ContentPanel cp = new ContentPanel(); 
     vp.setSpacing(10); 
     vp.setWidth("400px"); 
     HorizontalPanel hp = new HorizontalPanel(); 
     hp.setSpacing(5); 
     Buttons b = new Buttons(); 
     CellButtonBase<?> small = b.createButton(Buttons.Category.NORMAL, Buttons.Type.TEXT); 
     b.configureButton(small, Buttons.Type.TEXT, ButtonScale.SMALL); 
     hp.add(small); 
     vp.add(hp); 
     vp.add(b); //you are adding everything except the actual button 
     cp = new ContentPanel(GWT.<ContentPanelAppearance> create(FramedPanelAppearance.class)); 
     cp.addStyleName("margin-10"); 
     cp.setPixelSize(500, 400); 
     cp.getBody().getStyle().setBackgroundColor("white"); 
     cp.getBody().addClassName(ThemeStyles.getStyle().border()); 
     cp.add(vp); 
     cp.show(); 
    } 
}