richtexteditorcontainer.cpp

symbian C++ 开发学习的一个很好的例子

/*
* ============================================================================
*  Name     : CRTEContainer from RichTextEditorContainer.cpp
*  Part of  : RichTextEditor
*  Created  : 05/08/2006 by Forum Nokia 
*  Version  : 2.0
*  Copyright: Forum Nokia
* ============================================================================
*/

// INCLUDE FILES
#include "RichTextEditorContainer.h"
#include <txtrich.h>	//Richtext
#include <eikrted.h>  	//RichText Editor
#include <avkon.mbg> 	// Image Ids 
#include <eikenv.h> 	// ReadResource() 
#include <RichTextEditor.rsg> // Demo Text Buffer
#include "mypicture.h"   // CMyPicture 
#include <AknUtils.h>	

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

// Demo shows the T9 (Front End Processor) ,Scroller,
// "Insert Picture", disable Copy-Paste feature
// in RichText Editor

// CONSTANTS
_LIT( KImageBitmapFile, "picture.mbm");
//Text and images positions.
const TInt KLeftImagePositionInTheText	= 21;
const TInt KRightImagePositionInTheText	= 38;
const TInt KEndofCenterFormat			= 55;
const TInt KLeftNokia					= 6;
const TInt KRightNokia					= 11;
const TInt KKImageWidth					= 283;
const TInt KImageHeight					= 113;
//buffer size
const TInt KBufSize = 256;

// ---------------------------------------------------------
// CRTEContainer::Prepare()
// Set the Editor flags
// ---------------------------------------------------------
//
void CRTEContainer::Prepare()
	{

	// Lower Case 
	iRtEd->SetAknEditorCase(EAknEditorLowerCase);
	// Fixed case
	
	iRtEd->SetAknEditorFlags
		(
		EAknEditorFlagFixedCase| //Set up the Allowed Cases
		EAknEditorFlagEnableScrollBars // Set up the scroller
		);
	}

// ---------------------------------------------------------
//  CRTEContainer::PreparePicture()
//  Append Bitmap to iBitmap Array
// ---------------------------------------------------------
//
void CRTEContainer::PrepareBitmapL()
	{
	TFileName name(KImageBitmapFile);

	#ifndef __SERIES60_3X__
	CompleteWithAppPath( name );
	// windows build wants to install apps on rom drive ( "z:\" )
	// but we want the data from "c:\" instead
		#ifdef __WINS__
		name[ 0 ] = 'C';
		#endif
	#endif

	CFbsBitmap* bitmap;
	// Create and Load the Bitmap
	bitmap= new( ELeave )CFbsBitmap;
	CleanupStack::PushL(bitmap);
	User::LeaveIfError(bitmap->Load(name)); 
	//we have to free the memory at the Destructor() -> store the bitmap memory address
	iBitmap->AppendL(bitmap);
	CleanupStack::Pop(); //bitmap - container free bitmap at the destructor
	// last item in iBitmap array is ready to Insert
	}

// ---------------------------------------------------------
//  CRTEContainer::InsertMyPictureL()
//  Call Richtext's InsertL() with the CPicture
// ---------------------------------------------------------
//
void CRTEContainer::InsertMyPictureL(TInt aPos)
	{
	CMyPicture* picture;
	// Create a CPicture derived class which will draw our image, depending this Size
	picture = new( ELeave )CMyPicture(TSize(KKImageWidth,KImageHeight),
		*(iBitmap->At(iBitmap->Count()-1)/*process the last item of iBitmap*/));
	CleanupStack::PushL(picture);
	// Prepare the Picture header, which will be instered into the Richtext
	TPictureHeader header;
	header.iPicture =TSwizzle<CPicture>(picture);
	iRtEd->RichText()->InsertL( aPos,header); 
	CleanupStack::Pop(); // picture - Richtext take the ownership 
	}

// ---------------------------------------------------------
//  CRTEContainer::Demo()
//  Create Demo Text Content 
//
//  Selecting text as holding the 'ABC'+ joystick 
//  Copy/Paste working through longpress 'ABC' and selecting the 
//  softkey which labelled as our need
// 
//  Clipboard content remain even when example closed
// ---------------------------------------------------------
//
void CRTEContainer::DemoL()
	{
	iRtEd->SetCursorPosL(0,EFalse);
	// Set the Demo text to Richtext Editor
	TBuf<KBufSize> Demobuf;
	CEikonEnv::Static()->ReadResource(Demobuf, R_TYPE_II_DIALOG_TBUF_DEMO_TEXT);
	iRtEd->SetTextL(&Demobuf);
	
	// Insert a Bipmaps to Richtext 
	InsertMyPictureL(KLeftImagePositionInTheText);
	InsertMyPictureL(KRightImagePositionInTheText);
	
	//// To Compare the '\f' to EParagraphDelimiter change the comment status of the two following lines
	//iRtEd->RichText()->InsertL( KEndofCenterFormat , CEditableText::EParagraphDelimiter);
	_LIT(KFormat, "\f");
	iRtEd->RichText()->InsertL( KEndofCenterFormat , KFormat);

	// Basic Text Formatting border by EParagraphDelimiter, same as in Forum Nokia's Type - Example
	iRtEd->RichText()->InsertL( KLeftImagePositionInTheText , CEditableText::EParagraphDelimiter);
	
	// Do some color change
	SetSelectionL(KLeftImagePositionInTheText, KRightImagePositionInTheText);
	SetColor(KRgbRed);
	SetSelectionL(KLeftNokia, KRightNokia);
	SetColor(KRgbBlue);
	
	//set newline end of document
	iRtEd->RichText()->InsertL(iRtEd->Text()->DocumentLength() , CEditableText::ELineBreak);
	
	// Set the cursor end of the document
	iRtEd->SetCursorPosL(iRtEd->Text()->DocumentLength(), EFalse);
	}
	
void CRTEContainer::SetupL()
	{
    // One way to remove the selection
	//iRtEd->ClearSelectionL();
	
	// Copy-Paste Support is allowed in Edwin but we can disable
	// to do that uncomment the following line
	//iRtEd->EnableCcpuSupportL(EFalse);
	iRtEd->EnableCcpuSupportL(ETrue);
	// Another way to remove the selection.
	iRtEd->SetCursorPosL(0, EFalse);
	
	iRtEd->UpdateScrollBarsL();
	SizeChanged();
	}

// ---------------------------------------------------------
// CRTEContainer::ConstructL(const TRect& aRect)
// EPOC two phased constructor
// ---------------------------------------------------------
//
void CRTEContainer::ConstructL(const TRect& aRect)
    {
	CreateWindowL();

	iBitmap = new (ELeave) CArrayFixFlat<CFbsBitmap *>(2); // DemoL() show two image	
	iRtEd = new (ELeave) CEikRichTextEditor;
	
	iStatusLine = new (ELeave) CEikLabel;
	iStatusLine->SetAlignment(EHCenterVCenter);

	Prepare();
	PrepareBitmapL();
	
	iRtEd->ConstructL(this,0,0,0);
	iRtEd->SetFocus(ETrue);
	
	SetRect(aRect);

	IntroL();
	ActivateL();
	SetupL();
    }

// ---------------------------------------------------------
// CRTEContainer::~CRTEContainer()
// Destructor - Free the allocated resources
// ---------------------------------------------------------

CRTEContainer::~CRTEContainer()
    {
    if(iRtEd)
		delete iRtEd;
	
	if(iStatusLine)
		delete iStatusLine;
	 	
	// Delete each image, which have reference in the Array
	for(int i=0;i<iBitmap->Count();i++)
		{
		if(iBitmap->At(i))
			delete iBitmap->At(i);
		}
	// Free the Array
	if(iBitmap)
		delete iBitmap;
    }

// ---------------------------------------------------------
// CRTEContainer::SizeChanged()
// Called by framework when the view size is changed
// ---------------------------------------------------------
//
void CRTEContainer::SizeChanged()
    {
	TRect rect = Rect();
	TInt StatusLineHeight = iStatusLine->Font()->HeightInPixels()+6;
	iStatusLine->SetExtent(TPoint(0, 0),TSize(rect.Width(), StatusLineHeight));
	
	#ifdef __SERIES60_3X__
	TRect ScrollBarRect = iRtEd->ScrollBarFrame()->VerticalScrollBar()->Rect();
	//In 3rd edition CEikRichTextEditor draw the view for the whole rect and
	//the scrollbar doesn't show. That is a reason why CEikRichTextEditor Width() is
	//rect.Width()-ScrollBarRect.Width()
	iRtEd->SetExtent(TPoint(0,StatusLineHeight), 
		TSize(rect.Width()-ScrollBarRect.Width(), rect.Height()-StatusLineHeight));
	#else
    iRtEd->SetExtent(TPoint(0,StatusLineHeight), 
    	TSize(rect.Width(), rect.Height()-StatusLineHeight));