如何判斷GXT發生的事件？

Question

我似乎無法找到任何事件在GXT中觸發和何時發生的任何文檔。

的API文檔都可能觸發（在Events）的事件列表。它描述瞭如何處理你發現的事件。但我對另一面感興趣，當我採取某種行動時，事件被解僱。

我可以設置一些偵聽器的各種不同的部件，或者我可以使用addListener與特定事件的代碼，捕獲單個事件。這很不穩定，我似乎正在使用反覆試驗來猜測我想要捕捉的東西。

是否有一個記錄所有被解僱的事件呢？或者抓住所有這些，以便我可以在調試器中查看它們？

或者是有一些文檔，我缺少的是具有信息？點擊「點擊某個小部件時，ButtonEvent被觸發，Events.x被點擊懸停，Events.y點擊。」

Answer 1

我最終使用蠻力：創建一個地圖事件類型和名稱，然後附加一個監聽每種類型的事件，該組件可以接受的。然後我只是在Listener裏面設置一個斷點，並且我可以看到發生什麼事情時收到了什麼事件。

如果它沒有被一次性的代碼，我會清理它到一個實用工具類，而不是使用匿名偵聽器類，等等。

final Map<EventType, String> eventTypeNames = new HashMap<EventType, String>(); 
    eventTypeNames.put(Events.BeforeExpand, "BeforeExpand"); 
    eventTypeNames.put(Events.Expand, "Expand"); 
    ... 
    eventTypeNames.put(Events.BeforeStateSave, "BeforeStateSave"); 
    eventTypeNames.put(Events.StateSave, "StateSave"); 

    for (EventType eventType : Arrays.asList(
      Events.BeforeExpand, 
      Events.Expand, 
      ... 
      Events.BeforeStateSave, 
      Events.StateSave 
    )) { 
     this.addListener(eventType, new Listener<BaseEvent>() { 
      public void handleEvent(final BaseEvent be) { 
       String type = eventTypeNames.get(be.getType()); 
       String ev = be.toString(); 
      } 
     }); 
    } 

Answer 2

各種小部件的API文檔描述了什麼事件會觸發以及何時觸發。例如，假設我們希望用戶在TabPanel中選擇新的TabItem時採取行動。

TabPanel的API文檔（位於http://extjs.com/deploy/gxtdocs/com/extjs/gxt/ui/client/widget/TabPanel.html）示出幾個事件;我們在Select感興趣：

選擇：TabPanelEvent（容器項目）一個項目之後

火災被選中。

• 容器：此
• 項目：爲所選

這樣的項目，捕獲事件（這看來你理解，但我將包括完整的緣故）的過程是一個監聽器添加到TabPanel，專門爲Events.Select事件看：

tp.addListener(Events.Select, new Listener<TabPanelEvent>(){ 
    public void handleEvent(TabPanelEvent be) 
    { 
    MessageBox.alert("Test", be.item.getText(), null); 
    } 
}); 

請注意，許多事件都有一個名爲doit的屬性，您可以將其設置爲false來取消事件。

的完整代碼：

package edu.fresno.client; 

import com.extjs.gxt.ui.client.Events; 
import com.extjs.gxt.ui.client.event.Listener; 
import com.extjs.gxt.ui.client.event.TabPanelEvent; 
import com.extjs.gxt.ui.client.widget.ContentPanel; 
import com.extjs.gxt.ui.client.widget.MessageBox; 
import com.extjs.gxt.ui.client.widget.TabItem; 
import com.extjs.gxt.ui.client.widget.TabPanel; 
import com.extjs.gxt.ui.client.widget.layout.FitLayout; 
import com.google.gwt.core.client.EntryPoint; 
import com.google.gwt.user.client.ui.RootPanel; 

public class GWTSandbox implements EntryPoint { 
    public void onModuleLoad() { 

     TabPanel tp = new TabPanel(); 

     TabItem ti1 = new TabItem("TabItem1"); 
     TabItem ti2 = new TabItem("TabItem2"); 

     tp.add(ti1); 
     tp.add(ti2); 

     tp.addListener(Events.Select, new Listener<TabPanelEvent>(){ 
      public void handleEvent(TabPanelEvent be) 
      { 
       MessageBox.alert("Test", be.item.getText(), null); 
      } 
     }); 


     ContentPanel panel = new ContentPanel(); 
     panel.setLayout(new FitLayout()); 
     panel.add(tp); 
     RootPanel.get().add(panel); 

    } 
} 

Answer 3

您可以添加以下代碼爲構造函數：

ContentPanel panel =new ContentPanel(){ 
     public boolean fireEvent(EventType type) { 
      System.out.println(type.getEventCode()); 
      return super.fireEvent(type); 
     } 
     public boolean fireEvent(EventType eventType, BaseEvent be) { 
      System.out.println(eventType.getEventCode()); 
      return super.fireEvent(eventType, be); 
     } 
     public boolean fireEvent(EventType type, ComponentEvent ce) { 
      System.out.println(type.getEventCode()); 
      return super.fireEvent(type, ce); 
     } 
    }; 

然後它會打印這個組件可以接收任何事件。

Answer 4

也許有人會發現這個有用的，我創造了實用工具類，看看什麼樣的事件上升。當然這個想法是在接受的答案中提出的。

import java.util.HashMap; 
import java.util.Map; 

import com.extjs.gxt.ui.client.event.BaseEvent; 
import com.extjs.gxt.ui.client.event.EventType; 
import com.extjs.gxt.ui.client.event.Events; 
import com.extjs.gxt.ui.client.event.Listener; 
import com.extjs.gxt.ui.client.widget.Component; 

/** 
* Class for debugging purposes. Sometimes it is hard to tell what type of event 
* is invoked and when. During debug process you can just do: 
* 
* EventUtils.attachDebugListeners(c); 
* EventUtils.attachDebugListeners(c, "NAME"); 
* 
* You'll then get information about events as they are invoked. 
* 
* List of events copied from {@link Events} class. 
* 
*/ 
public class EventUtils { 

    public static void attachDebugListeners(final Component c) { 
     attachDebugListeners(c, null); 
    } 

    public static void attachDebugListeners(final Component c, final String msg) { 
     for (final EventType type : eventTypeNames.keySet()) { 
      c.addListener(type, new Listener<BaseEvent>() { 
       @Override 
       public void handleEvent(BaseEvent be) { 
        String typeName = eventTypeNames.get(type); 
        if (msg != null) 
         System.out.print(msg + " -> "); 
        System.out.println(typeName); 
       } 
      }); 
     } 
    } 

    final static Map<EventType, String> eventTypeNames = new HashMap<EventType, String>(); 
    static { 
     eventTypeNames.put(Events.Activate, "Events.Activate"); 
     eventTypeNames.put(Events.Add, "Events.Add"); 
     eventTypeNames.put(Events.Adopt, "Events.Adopt"); 
     eventTypeNames.put(Events.AfterEdit, "Events.AfterEdit"); 
     eventTypeNames.put(Events.AfterLayout, "Events.AfterLayout"); 
     eventTypeNames.put(Events.ArrowClick, "Events.ArrowClick"); 
     eventTypeNames.put(Events.Attach, "Events.Attach"); 
     eventTypeNames.put(Events.AutoHide, "Events.AutoHide"); 
     eventTypeNames.put(Events.BeforeAdd, "Events.BeforeAdd"); 
     eventTypeNames.put(Events.BeforeAdopt, "Events.BeforeAdopt"); 
     eventTypeNames.put(Events.BeforeBind, "Events.BeforeBind"); 
     eventTypeNames.put(Events.BeforeCancelEdit, "Events.BeforeCancelEdit"); 
     eventTypeNames.put(Events.BeforeChange, "Events.BeforeChange"); 
     eventTypeNames 
       .put(Events.BeforeCheckChange, "Events.BeforeCheckChange"); 
     eventTypeNames.put(Events.BeforeClose, "Events.BeforeClose"); 
     eventTypeNames.put(Events.BeforeCollapse, "Events.BeforeCollapse"); 
     eventTypeNames.put(Events.BeforeComplete, "Events.BeforeComplete"); 
     eventTypeNames.put(Events.BeforeEdit, "Events.BeforeEdit"); 
     eventTypeNames.put(Events.BeforeExpand, "Events.BeforeExpand"); 
     eventTypeNames.put(Events.BeforeHide, "Events.BeforeHide"); 
     eventTypeNames.put(Events.BeforeLayout, "Events.BeforeLayout"); 
     eventTypeNames.put(Events.BeforeOpen, "Events.BeforeOpen"); 
     eventTypeNames.put(Events.BeforeOrphan, "Events.BeforeOrphan"); 
     eventTypeNames.put(Events.BeforeQuery, "Events.BeforeQuery"); 
     eventTypeNames.put(Events.BeforeRemove, "Events.BeforeRemove"); 
     eventTypeNames.put(Events.BeforeRender, "Events.BeforeRender"); 
     eventTypeNames.put(Events.BeforeSelect, "Events.BeforeSelect"); 
     eventTypeNames.put(Events.BeforeShow, "Events.BeforeShow"); 
     eventTypeNames.put(Events.BeforeStartEdit, "Events.BeforeStartEdit"); 
     eventTypeNames.put(Events.BeforeStateRestore, 
       "Events.BeforeStateRestore"); 
     eventTypeNames.put(Events.BeforeStateSave, "Events.BeforeStateSave"); 
     eventTypeNames.put(Events.BeforeSubmit, "Events.BeforeSubmit"); 
     eventTypeNames.put(Events.Bind, "Events.Bind"); 
     eventTypeNames.put(Events.Blur, "Events.Blur"); 
     eventTypeNames.put(Events.BodyScroll, "Events.BodyScroll"); 
     eventTypeNames.put(Events.BrowserEvent, "Events.BrowserEvent"); 
     eventTypeNames.put(Events.CancelEdit, "Events.CancelEdit"); 
     eventTypeNames.put(Events.CellClick, "Events.CellClick"); 
     eventTypeNames.put(Events.CellDoubleClick, "Events.CellDoubleClick"); 
     eventTypeNames.put(Events.CellMouseDown, "Events.CellMouseDown"); 
     eventTypeNames.put(Events.CellMouseUp, "Events.CellMouseUp"); 
     eventTypeNames.put(Events.Change, "Events.Change"); 
     eventTypeNames.put(Events.CheckChange, "Events.CheckChange"); 
     eventTypeNames.put(Events.CheckChanged, "Events.CheckChanged"); 
     eventTypeNames.put(Events.Clear, "Events.Clear"); 
     eventTypeNames.put(Events.Close, "Events.Close"); 
     eventTypeNames.put(Events.Collapse, "Events.Collapse"); 
     eventTypeNames.put(Events.ColumnClick, "Events.ColumnClick"); 
     eventTypeNames.put(Events.ColumnResize, "Events.ColumnResize"); 
     eventTypeNames.put(Events.Complete, "Events.Complete"); 
     eventTypeNames.put(Events.ContextMenu, "Events.ContextMenu"); 
     eventTypeNames.put(Events.Deactivate, "Events.Deactivate"); 
     eventTypeNames.put(Events.Detach, "Events.Detach"); 
     eventTypeNames.put(Events.Disable, "Events.Disable"); 
     eventTypeNames.put(Events.DoubleClick, "Events.DoubleClick"); 
     eventTypeNames.put(Events.DragCancel, "Events.DragCancel"); 
     eventTypeNames.put(Events.DragEnd, "Events.DragEnd"); 
     eventTypeNames.put(Events.DragEnter, "Events.DragEnter"); 
     eventTypeNames.put(Events.DragFail, "Events.DragFail"); 
     eventTypeNames.put(Events.DragLeave, "Events.DragLeave"); 
     eventTypeNames.put(Events.DragMove, "Events.DragMove"); 
     eventTypeNames.put(Events.DragStart, "Events.DragStart"); 
     eventTypeNames.put(Events.Drop, "Events.Drop"); 
     eventTypeNames.put(Events.EffectCancel, "Events.EffectCancel"); 
     eventTypeNames.put(Events.EffectComplete, "Events.EffectComplete"); 
     eventTypeNames.put(Events.EffectStart, "Events.EffectStart"); 
     eventTypeNames.put(Events.Enable, "Events.Enable"); 
     eventTypeNames.put(Events.Exception, "Events.Exception"); 
     eventTypeNames.put(Events.Expand, "Events.Expand"); 
     eventTypeNames.put(Events.Focus, "Events.Focus"); 
     eventTypeNames.put(Events.HeaderChange, "Events.HeaderChange"); 
     eventTypeNames.put(Events.HeaderClick, "Events.HeaderClick"); 
     eventTypeNames 
       .put(Events.HeaderContextMenu, "Events.HeaderContextMenu"); 
     eventTypeNames 
       .put(Events.HeaderDoubleClick, "Events.HeaderDoubleClick"); 
     eventTypeNames.put(Events.HeaderMouseDown, "Events.HeaderMouseDown"); 
     eventTypeNames.put(Events.HiddenChange, "Events.HiddenChange"); 
     eventTypeNames.put(Events.Hide, "Events.Hide"); 
     eventTypeNames.put(Events.Invalid, "Events.Invalid"); 
     eventTypeNames.put(Events.KeyDown, "Events.KeyDown"); 
     eventTypeNames.put(Events.KeyPress, "Events.KeyPress"); 
     eventTypeNames.put(Events.KeyUp, "Events.KeyUp"); 
     eventTypeNames.put(Events.LiveGridViewUpdate, 
       "Events.LiveGridViewUpdate"); 
     eventTypeNames.put(Events.Maximize, "Events.Maximize"); 
     eventTypeNames.put(Events.MenuHide, "Events.MenuHide"); 
     eventTypeNames.put(Events.MenuShow, "Events.MenuShow"); 
     eventTypeNames.put(Events.Minimize, "Events.Minimize"); 
     eventTypeNames.put(Events.Move, "Events.Move"); 
     eventTypeNames.put(Events.OnBlur, "Events.OnBlur"); 
     eventTypeNames.put(Events.OnChange, "Events.OnChange"); 
     eventTypeNames.put(Events.OnClick, "Events.OnClick"); 
     eventTypeNames.put(Events.OnContextMenu, "Events.OnContextMenu"); 
     eventTypeNames.put(Events.OnDoubleClick, "Events.OnDoubleClick"); 
     eventTypeNames.put(Events.OnError, "Events.OnError"); 
     eventTypeNames.put(Events.OnFocus, "Events.OnFocus"); 
     eventTypeNames.put(Events.OnKeyDown, "Events.OnKeyDown"); 
     eventTypeNames.put(Events.OnKeyPress, "Events.OnKeyPress"); 
     eventTypeNames.put(Events.OnKeyUp, "Events.OnKeyUp"); 
     eventTypeNames.put(Events.OnLoad, "Events.OnLoad"); 
     eventTypeNames.put(Events.OnLoseCapture, "Events.OnLoseCapture"); 
     eventTypeNames.put(Events.OnMouseDown, "Events.OnMouseDown"); 
     eventTypeNames.put(Events.OnMouseMove, "Events.OnMouseMove"); 
     eventTypeNames.put(Events.OnMouseOut, "Events.OnMouseOut"); 
     eventTypeNames.put(Events.OnMouseOver, "Events.OnMouseOver"); 
     eventTypeNames.put(Events.OnMouseUp, "Events.OnMouseUp"); 
     eventTypeNames.put(Events.OnMouseWheel, "Events.OnMouseWheel"); 
     eventTypeNames.put(Events.OnScroll, "Events.OnScroll"); 
     eventTypeNames.put(Events.Open, "Events.Open"); 
     eventTypeNames.put(Events.Orphan, "Events.Orphan"); 
     eventTypeNames.put(Events.Ready, "Events.Ready"); 
     eventTypeNames.put(Events.Refresh, "Events.Refresh"); 
     eventTypeNames.put(Events.Register, "Events.Register"); 
     eventTypeNames.put(Events.Remove, "Events.Remove"); 
     eventTypeNames.put(Events.Render, "Events.Render"); 
     eventTypeNames.put(Events.Resize, "Events.Resize"); 
     eventTypeNames.put(Events.ResizeEnd, "Events.ResizeEnd"); 
     eventTypeNames.put(Events.ResizeStart, "Events.ResizeStart"); 
     eventTypeNames.put(Events.Restore, "Events.Restore"); 
     eventTypeNames.put(Events.RowClick, "Events.RowClick"); 
     eventTypeNames.put(Events.RowDoubleClick, "Events.RowDoubleClick"); 
     eventTypeNames.put(Events.RowMouseDown, "Events.RowMouseDown"); 
     eventTypeNames.put(Events.RowMouseUp, "Events.RowMouseUp"); 
     eventTypeNames.put(Events.RowUpdated, "Events.RowUpdated"); 
     eventTypeNames.put(Events.Scroll, "Events.Scroll"); 
     eventTypeNames.put(Events.Select, "Events.Select"); 
     eventTypeNames.put(Events.SelectionChange, "Events.SelectionChange"); 
     eventTypeNames.put(Events.Show, "Events.Show"); 
     eventTypeNames.put(Events.SortChange, "Events.SortChange"); 
     eventTypeNames.put(Events.SpecialKey, "Events.SpecialKey"); 
     eventTypeNames.put(Events.StartEdit, "Events.StartEdit"); 
     eventTypeNames.put(Events.StateChange, "Events.StateChange"); 
     eventTypeNames.put(Events.StateRestore, "Events.StateRestore"); 
     eventTypeNames.put(Events.StateSave, "Events.StateSave"); 
     eventTypeNames.put(Events.Submit, "Events.Submit"); 
     eventTypeNames.put(Events.Toggle, "Events.Toggle"); 
     eventTypeNames.put(Events.TriggerClick, "Events.TriggerClick"); 
     eventTypeNames.put(Events.TwinTriggerClick, "Events.TwinTriggerClick"); 
     eventTypeNames.put(Events.UnBind, "Events.UnBind"); 
     eventTypeNames.put(Events.Unregister, "Events.Unregister"); 
     eventTypeNames.put(Events.Update, "Events.Update"); 
     eventTypeNames.put(Events.Valid, "Events.Valid"); 
     eventTypeNames.put(Events.ValidateDrop, "Events.ValidateDrop"); 
     eventTypeNames.put(Events.ValidateEdit, "Events.ValidateEdit"); 
     eventTypeNames.put(Events.ViewReady, "Events.ViewReady"); 
    } 
}