helloworldcontainer.cpp

symbian平台helloword 的例子。

/**
* 
* @brief Definition of CHelloWorldContainer
*
* Copyright (c) EMCC Software Ltd 2003
* @version 1.0
*/

// INCLUDE FILES

// Class include
#include "HelloWorldContainer.h"

// System includes
#include <eiklabel.h> // CEikLabel
#include <HelloWorld.rsg> // R_LABEL_TEXT
#include <stringloader.h> // StringLoader

// CONSTANTS

// N.B. #define'd as DLL cannot contain writeable static data
#define KLabelPosition TPoint(10,10) 

// ================= MEMBER FUNCTIONS =======================

/**
* Symbian OS 2nd phase constructor.  Creates a Window for the controls, which it contains.
* Constructs a label and adds it to the window, which it then activates.
* @param aRect The rectangle for this window
*/		
void CHelloWorldContainer::ConstructL(const TRect& aRect)
	{
	CreateWindowL();
	
	iLabel = new (ELeave) CEikLabel;
	iLabel->SetContainerWindowL(*this);
	
	HBufC* labelText;
	labelText = StringLoader::LoadLC(R_LABEL_TEXT);	// Pushes labelText onto the Cleanup Stack.
	iLabel->SetTextL(*labelText);
	CleanupStack::PopAndDestroy(labelText);
	
	SetRect(aRect);
	ActivateL();
	}

/**
* Symbian OS 2 phase constructor.
* Constructs the CHelloWorldContainer using the NewLC method, popping
* the constructed object from the CleanupStack before returning it.
* 
* @param aRect The rectangle for this window
* @return The newly constructed CHelloWorldContainer
*/
CHelloWorldContainer* CHelloWorldContainer::NewL(const TRect& aRect)
	{
	CHelloWorldContainer* self = CHelloWorldContainer::NewLC(aRect);
	CleanupStack::Pop(self);
	return self;
	}

/**
* Symbian OS 2 phase constructor.
* Constructs the CHelloWorldContainer using the constructor and ConstructL 
* method, leaving the constructed object on the CleanupStack before returning it.
* 
* @param aRect The rectangle for this window
* @return The newly constructed CHelloWorldContainer
*/
CHelloWorldContainer* CHelloWorldContainer::NewLC(const TRect& aRect)
	{
	CHelloWorldContainer* self = new (ELeave) CHelloWorldContainer;
	CleanupStack::PushL(self);
	self->ConstructL(aRect);
	return self;
	}

/** 
* Destructor.  Frees up memory for the iLabel.
*/
CHelloWorldContainer::~CHelloWorldContainer()
	{
	delete iLabel;
	}

/**
*	
* Called by framework when the view size is changed.  Resizes the
* iLabel accordingly.
*
*/
void CHelloWorldContainer::SizeChanged()
	{
	iLabel->SetExtent(KLabelPosition, iLabel->MinimumSize());
	}

/**
* Called by the framework in compound controls	
* @return The number of controls in this CHelloWorldContainer
*/
TInt CHelloWorldContainer::CountComponentControls() const
	{
	return 1; // return number of controls inside this container
	}

/**
* Called by the framework in compound controls	
* @param The index of the control to return
* @return The control for aIndex
*/
CCoeControl* CHelloWorldContainer::ComponentControl(TInt aIndex) const
	{
	switch (aIndex)
		{
		case 0:
			return iLabel;
		default:
			return NULL;
		}
	}

/**
* Called by the framework to draw this control.  Clears the area in 
* aRect.
* @param aRect in which to draw
*/
void CHelloWorldContainer::Draw(const TRect& aRect) const
	{
	CWindowGc& gc = SystemGc();
	gc.Clear(aRect);
	}

// End of File