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This page was last modified 06:55, 9 July 2008.

CS001061 - 使用CAknGlobalListQuery显示一个全局列表查询框

From Forum Nokia Wiki


ID CS001061 Creation date July 3, 2008
Platform S60 3rd Edition, FP1 Tested on devices Nokia N93
Category Symbian C++ Subcategory Files/Data


Keywords (APIs, classes, methods, functions): CAknGlobalListQuery, CDesCArray, CCoeEnv, CAknGlobalListQuery::NewL(),

CAknGlobalListQuery::ShowListQueryL(), CCoeEnv::ReadDesCArrayResourceL()

概述

这个代码片段演示如何创建一个全局的列表查询框CAknGlobalListQuery。通过调用 NewL()来创建一个全局列表查询框,使用ShowListQueryL()方法来执行。此例使用通用类CGlobalQueryHandlerAO,这个类也用在其它全局查询代码片段中。类CGlobalQueryContainer用来调出查询框,也是观察者,实现了接口MGlobalQueryObserver

注意: CAknGlobalListQuery 只能含有很简单的条目。 跳格键(Tab)不能在条目中使用。

此片段能用自签名。

MMP文件

下面的库文件是必须的:

LIBRARY     cone.lib            //CEikonEnv, CCoeEnv 
LIBRARY     avkon.lib           //Avkon resources
LIBRARY     euser.lib           //CActive, CleanupStack
LIBRARY     bafl.lib            //CDesCArray


资源文件

.rss

#include <eikon.rh>
#include <avkon.rsg>
#include <avkon.rh>
 
//...
RESOURCE ARRAY r_global_query_item_list_array
    {
    items=
        {
        LBUF {txt="<item 1>"; },
        LBUF {txt="<item 2>"; },
        LBUF {txt="<item 3>"; },
        LBUF {txt="<item 4>"; }
        };
    }

头文件

  • 观察者接口
#ifndef GLOBALQUERYOBSERVER_H
#define GLOBALQUERYOBSERVER_H
 
class MGlobalQueryObserver
    {
public:     
    //keep these methods short running because they are called
    //from within an active object  
    virtual void ProcessOkOptionL() = 0;
    virtual void ProcessCancelOptionL() = 0;
    virtual void ProcessDoneOptionL() = 0;
    virtual void ProcessSelectedItemL(const TInt aItem) = 0;
    };
 
#endif  // GLOBALQUERYOBSERVER_H
  • 处理器——活动对象
#ifndef GLOBALQUERYHANDLERAO_H
#define GLOBALQUERYHANDLERAO_H
 
#include <e32base.h>  //CActive
#include "GlobalQueryObserver.h"
 
class CGlobalQueryHandlerAO : public CActive
    {
public:
    ~CGlobalQueryHandlerAO();
    static CGlobalQueryHandlerAO* NewL(MGlobalQueryObserver& aObserver);
    static CGlobalQueryHandlerAO* NewLC(MGlobalQueryObserver& aObserver);   
public: 
    void StartHandler();    
private:    
    CGlobalQueryHandlerAO(MGlobalQueryObserver& aObserver) 
            : CActive (EPriorityStandard), iObserver(aObserver){};
    void ConstructL();  
private: // from CActive    
    void RunL();
    void DoCancel();
private: // data
    MGlobalQueryObserver& iObserver;
    };
#endif //GLOBALQUERYHANDLERAO_H
  • 容器/观察者
#ifndef GLOBALQUERYCONTAINER_H
#define GLOBALQUERYCONTAINER_H
 
#include <badesca.h> // CDesCArray
#include <coecntrl.h> // CCoeControl
#include "GlobalQueryObserver.h"
#include <akngloballistquery.h> //CAknGlobalListQuery
class CGlobalQueryHandlerAO;
 
class CGlobalQueryContainer : public CCoeControl, MGlobalQueryObserver
    {
public:
//...
void MakeExampleQueryL();
public: // from MGlobalQueryObserver
    void ProcessOkOptionL(); //not used
    void ProcessCancelOptionL(); //not used
    void ProcessDoneOptionL(); //not used
    void ProcessSelectedItemL(const TInt aItem); 
//...
private:
    CGlobalQueryHandlerAO*       iQueryHandlerAO;
    CAknGlobalListQuery*         iGlobalListQuery;
    };
#endif  // GLOBALQUERYCONTAINER_H


源代码文件

  • 处理器——活动对象
#include "GlobalQueryHandlerAO.h"
#include <avkon.hrh> //EAknSoftkeyOk, EAknSoftkeyCancel, EAknSoftkeyDone
 
CGlobalQueryHandlerAO::~CGlobalQueryHandlerAO() { Cancel(); }
 
void CGlobalQueryHandlerAO::ConstructL()
    {
    CActiveScheduler::Add(this);
    }
 
CGlobalQueryHandlerAO* CGlobalQueryHandlerAO::NewLC(MGlobalQueryObserver& aObserver)
    {
    CGlobalQueryHandlerAO* self = new (ELeave) CGlobalQueryHandlerAO(aObserver);
    CleanupStack::PushL(self);
    self->ConstructL();
    return self;
    }
 
CGlobalQueryHandlerAO* CGlobalQueryHandlerAO::NewL(MGlobalQueryObserver& aObserver)
    {
    CGlobalQueryHandlerAO* self = CGlobalQueryHandlerAO::NewLC(aObserver);
    CleanupStack::Pop(self);
    return self;
    }
 
void CGlobalQueryHandlerAO::DoCancel(){}
 
void CGlobalQueryHandlerAO::StartHandler() { SetActive(); }
 
void CGlobalQueryHandlerAO::RunL()
    {
    if (iStatus == EAknSoftkeyOk)
        iObserver.ProcessOkOptionL();
    else if(iStatus == EAknSoftkeyCancel)
        iObserver.ProcessCancelOptionL();
    else if(iStatus == EAknSoftkeyDone)
        iObserver.ProcessDoneOptionL();
    else
        iObserver.ProcessSelectedItemL(iStatus.Int());
        
    Cancel();
    }
  • 容器/观察者
#include "GlobalQueryContainer.h" //CGlobalQueryContainer
#include "GlobalQueryHandlerAO.h" //CGlobalQueryHandlerAO
#include <GlobalQuery_0xED0C36BE.rsg> //Resources
 
void CGlobalQueryContainer::ConstructL(const TRect& aRect)
    {
    CreateWindowL();
    SetRect(aRect);
    ActivateL();
    
    MakeExampleQueryL();
    }
 
void CGlobalQueryContainer::MakeExampleQueryL()
    {   
    //start the query handler and show global list query
    iQueryHandlerAO = CGlobalQueryHandlerAO::NewL(*this);
    iQueryHandlerAO->StartHandler();    
    iGlobalListQuery = CAknGlobalListQuery::NewL();
    
    CDesCArray* itemArray = iCoeEnv->ReadDesCArrayResourceL( 
                                    R_GLOBAL_QUERY_ITEM_LIST_ARRAY );
    CleanupStack::PushL(itemArray);   
        
    iGlobalListQuery->ShowListQueryL(itemArray, iQueryHandlerAO->iStatus);
        
    CleanupStack::PopAndDestroy(itemArray);
    }
 
CGlobalQueryContainer::~CGlobalQueryContainer()
    {
    //...
    delete iQueryHandlerAO;
    delete iGlobalListQuery;
    }
 
void CGlobalQueryContainer::ProcessOkOptionL()
    {
    //not used
    }
void CGlobalQueryContainer::ProcessCancelOptionL()
    {
    //not used
    }
void CGlobalQueryContainer::ProcessDoneOptionL()
    {
    //not used
    }
void CGlobalQueryContainer::ProcessSelectedItemL(const TInt aItem)
    {   
    //Item selected, do something...
    TBuf<10> item;
    item.AppendNum(aItem);
    iEikonEnv->InfoWinL(_L("Process Item:"),item);
    }

后置条件

本例代码演示如何创建一个全局列表查询框、处理查询框的关闭、以及活动处理器如何通知观察者类对话框已关闭。

参见

 
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