如何完成自定义的CAknQueryDialog对话框

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文章信息

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兼容于

平台: S60 3rd Edition, S60 5th Edition

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需要的签名: Self-Signed

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文章

翻译:

翻译自: Implementing a custom CAknQueryDialog dialog

由 hoolee

最后由 hamishwillee 在 27 Aug 2012 编辑

• 详细描述

下列代码演示了如何完成一个自定义的对话框。在这个情况下对话框就像程序的splash屏。本对话框会在程序运行2秒后关闭。

下列代码可以自签名运行。

• MMP文件

需要下列链接库和能力

CAPABILITY None       
 
LIBRARY avkon.lib
LIBRARY eikcoctl.lib
LIBRARY eikdlg.lib
LIBRARY euser.lib

• 头文件

#include <aknquerydialog.h>
#include <e32std.h>
#include <e32base.h>
#include <eikbtgpc.h>
 
class CSplashScreenDialog : public CAknQueryDialog
    {
    public: // Construction
        CSplashScreenDialog();
        virtual ~CSplashScreenDialog();
        void PreLayoutDynInitL();
        void PostLayoutDynInitL();
        TBool OkToExitL(TInt aButtonId);
 
    private: // From base classes
        void SizeChanged();
        TInt CountComponentControls() const;
        CCoeControl* ComponentControl(TInt aIndex) const;
        void Draw( const TRect& /*aRect*/ ) const;
        void SetSizeAndPosition(const TSize &aSize);
 
    private: // Internal methods
        void CalculatePositionAndSize();
        static TInt HideDialog(TAny* aAny);
 
    private: // Data
        CPeriodic*          iPeriodic;
    };

• 源文件

#include "csplashscreendialog.h"
 
const TInt KShowTime(2000000);
 
CSplashScreenDialog::CSplashScreenDialog()
    {
    // Closes this dialog after KShowTime 2s
    TRAPD(err,
            iPeriodic = CPeriodic::NewL(CActive::EPriorityIdle);
    );
    if (!err)
        {
        iPeriodic->Start(KShowTime, KShowTime, TCallBack(HideDialog, this));
        }
    }
 
CSplashScreenDialog::~CSplashScreenDialog()
    {
    if (iPeriodic)
        {
        iPeriodic->Cancel();
        }
    delete iPeriodic;
    }
 
void CSplashScreenDialog::PreLayoutDynInitL()
    {
    CAknQueryDialog::PreLayoutDynInitL();
    SetEditableL(EFalse);    
    }
 
void CSplashScreenDialog::PostLayoutDynInitL()
    {
    // No CBA buttons
    CEikButtonGroupContainer* cba = CEikButtonGroupContainer::Current();
    cba->MakeVisible(EFalse);
 
    // Calculate position of the dialog
    CalculatePositionAndSize();
    }
 
TBool CSplashScreenDialog::OkToExitL(TInt /*aButtonId*/)
    {
    return ETrue;
    }
 
TInt CSplashScreenDialog::CountComponentControls() const
    {
    // No child components in this example
    return(0); 
    }
 
CCoeControl* CSplashScreenDialog::ComponentControl(TInt /*aIndex*/) const
    {
    // No child components in this example
    return NULL;
    }
 
void CSplashScreenDialog::CalculatePositionAndSize()
    {
    // Set full screen
    SetExtentToWholeScreen();
    }
 
void CSplashScreenDialog::SetSizeAndPosition(const TSize &aSize)
    {
    CAknQueryDialog::SetSizeAndPosition( aSize );
    CalculatePositionAndSize();
    }
 
void CSplashScreenDialog::SizeChanged()
    {
    // Update screen
    DrawNow();
    }
 
void CSplashScreenDialog::Draw( const TRect& /*aRect*/ ) const
    {
    // Get the standard graphics context
    CWindowGc& gc = SystemGc();
    gc.SetPenStyle( CGraphicsContext::ENullPen );
    gc.SetBrushColor( KRgbBlack);
    gc.SetBrushStyle( CGraphicsContext::ESolidBrush );
 
    // Clear screen
    gc.Clear(Rect());
    gc.SetBrushStyle( CGraphicsContext::ENullBrush );
 
    // Draw round rect
    gc.SetPenStyle( CGraphicsContext::ESolidPen );
    gc.SetPenColor(KRgbWhite);
    gc.DrawRect(Rect());
 
    // TODO: Implement what you need
    }
 
TInt CSplashScreenDialog::HideDialog(TAny* aAny)
    {
    CSplashScreenDialog* self = static_cast<CSplashScreenDialog*>( aAny );
 
    // Cancel CPeriodic timer
    self->iPeriodic->Cancel();
 
    // Closes itself
    TRAP_IGNORE(
            self->TryExitL(1);
            );
    return KErrNone;
    }

• 自定义对话框资源

RESOURCE DIALOG r_custom_dialog
    {
    flags = EGeneralQueryFlags;
    buttons = R_AVKON_SOFTKEYS_EMPTY;
    }

• 运行对话框

iSplashScreenDialog = new (ELeave) CSplashScreenDialog();
iSplashScreenDialog->ExecuteLD(R_CUSTOM_DIALOG);
// Execution continues here after dialog has hided itself
iSplashScreenDialog = NULL;

• 后记

该对话框可以显示2秒