audioplayerview.cpp

一个视频播放器的源代码！供新手学习！功能很简单

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

// INCLUDES

// Class include
#include "AudioPlayerView.h"

// System includes
#include <eiklabel.h> // CEikLabel
#include <eikenv.h>   // CEikEnv
#include <stringloader.h> // Stringloader
#include <barsread.h> //
#include <AudioPlayer.rsg> // resources

// User Includes
#include "AudioPlayer.loc"

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

/**
* C++ constructor.
*/
CAudioPlayerView::CAudioPlayerView()
	{
	}

/**
* Destructor
*/
CAudioPlayerView::~CAudioPlayerView()
	{
	delete iDisplayStatus;
	delete iEngine;
	}

/**
 * Symbian OS 2 phase constructor.
 * Constructs the CAudioPlayerAppView, popping
 * the constructed object from the CleanupStack before returning it.
 *
 * @param aRect The rectangle for this window
 * @return The newly constructed CAudioPlayerAppView
 */
CAudioPlayerView* CAudioPlayerView::NewL(const TRect& aRect)
	{
	CAudioPlayerView* self = new (ELeave) CAudioPlayerView();
	CleanupStack::PushL(self);
	self->ConstructL(aRect);
	CleanupStack::Pop(self);
	return self;
	}

/**
 * Symbian OS 2nd phase constructor.  Creates a Window for the controls, which it contains.
 * Constructs a label which will be used to indicate the status of the player
 *
 * @param aRect The rectangle for this window
 */
void CAudioPlayerView::ConstructL(const TRect& aRect)
	{
	CreateWindowL();
	SetRect(aRect);

	iDisplayStatus = new (ELeave) CEikLabel();
	iDisplayStatus->SetContainerWindowL(*this);
	iDisplayStatus->SetRect(Rect());
	iDisplayStatus->SetAlignment(EHCenterVCenter);

	HBufC* text = StringLoader::LoadLC(R_AUDIOPLAYER_DISPLAY_STOPPED);
	iDisplayStatus->SetTextL(*text);
	CleanupStack::PopAndDestroy(text);

	iDisplayStatus->SetFont(CEikonEnv::Static()->TitleFont());

	ActivateL();
	DrawDeferred();

	iEngine = CAudioPlayerEngine::NewL(*this);
	}

/**
* Draw function is used to clear the rectangular area of the control
*
* @param aRect The rectangular that would be drawn to
*/
void CAudioPlayerView::Draw(const TRect& /*aRect*/) const
	{
	CWindowGc& gc = SystemGc();
	gc.Clear(Rect());
	}

/**
* Framework function returning the number of controls within this one
*
* @return The number of controls
*/
TInt CAudioPlayerView::CountComponentControls() const
	{
	return 1;
	}
/**
* Used by the framework to get a handle on a particular control within this one
*
* @param aIndex the index of the control to be returned
* @return The control at aIndex
*/
CCoeControl* CAudioPlayerView::ComponentControl(TInt /*aIndex*/) const
	{
	return iDisplayStatus;
	}

/**
* MAudioPlayerEngineObserver derivation
* Updates the view to inform the user playing has stopped
*/
void CAudioPlayerView::HandlePlayingStoppedL()
	{
	HBufC* text = StringLoader::LoadLC(R_AUDIOPLAYER_DISPLAY_STOPPED);
	iDisplayStatus->SetTextL(*text);
	iDisplayStatus->DrawDeferred();
	CleanupStack::PopAndDestroy(text);
	}

/**
* Sets the view display to inform the user a tone is being played
* Plays a tone by making a call to the engine.
*/
void CAudioPlayerView::PlayToneL()
	{
	HBufC* text = StringLoader::LoadLC(R_AUDIOPLAYER_DISPLAY_PLAYING);
	iDisplayStatus->SetTextL(*text);
	CleanupStack::PopAndDestroy(text);

	iEngine->PlayToneL();
	}

/**
* Sets the view display to inform the user a wav is being played
* Plays a wav by making a call to the engine.
*/
void CAudioPlayerView::PlayWavL()
	{
	HBufC* text = StringLoader::LoadLC(R_AUDIOPLAYER_DISPLAY_PLAYING);
	iDisplayStatus->SetTextL(*text);
	CleanupStack::PopAndDestroy(text);

	iEngine->PlayWavL();
	}

/**
* Sets the view display to inform the user a midi file is being played
* Plays a midi by making a call to the engine.
*/
void CAudioPlayerView::PlayMidiL()
	{
	HBufC* text = StringLoader::LoadLC(R_AUDIOPLAYER_DISPLAY_PLAYING);
	iDisplayStatus->SetTextL(*text);
	CleanupStack::PopAndDestroy(text);

	iEngine->PlayMidiL();
	}

/**
* Sets the view display to inform the user a stream is being played
* Plays a stream by making a call to the engine.
*/
void CAudioPlayerView::PlayStreamL()
	{
	HBufC* text = StringLoader::LoadLC(R_AUDIOPLAYER_DISPLAY_PLAYING);
	iDisplayStatus->SetTextL(*text);
	CleanupStack::PopAndDestroy(text);

	iEngine->PlayStreamL();
	}

/**
* Informs the engine to stop playing
* Updates the view display to inform the user that playing has been stopped
*/
void CAudioPlayerView::StopL()
	{
	iEngine->Stop();

	HBufC* text = StringLoader::LoadLC(R_AUDIOPLAYER_DISPLAY_STOPPED);
	iDisplayStatus->SetTextL(*text);
	CleanupStack::PopAndDestroy(text);
	}