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This page was last modified 12:24, 13 December 2007.

在文本(CEikRichTextEditor)中插入带背景的图片

From Forum Nokia Wiki

适用版本： 

Series 60 2nd , Series 60 3rd

更多关于在文本中插入图片参见这里： [1]

一般情况下，在CEikRichTextEditor中插入的图片都是绘制在白色的背景上的，包括Forum Nokia提供的示例也是如此，如果在带有背景的Editor中使用会很别扭，下面将演示如何在文本中插入带背景的图片。


方案思路：

首先CRTxPicture是一个继承自CPicture的图片类，在该类的Draw()函数中首先绘制背景，然后在其之上绘制实际的图片。 

void CRTxPicture::Draw(CGraphicsContext& aGc, const TPoint& aTopLeft,   const TRect& aClipRect, MGraphicsDeviceMap* aMap) const
 {
    CBitmapContext& gc = static_cast<CBitmapContext &>(aGc);
    TRect bmpPieceRect(TPoint(0,0),iBitmap->SizeInPixels());
    
    // here is the skin background drawn
    iControl.RTxDrawBackground(aTopLeft, bmpPieceRect, gc);
 
    // then the picture itself
    gc.BitBltMasked(aTopLeft, iBitmap, bmpPieceRect, iBitmapMask, ETrue);
 }

背景实际是在容器(Container)中绘制的,因此Container必须继承自MRTxBackgroundDrawer类，而且必须实现其中的RTxDrawBackground ()函数。 

class MRTxBackgroundDrawer
 {
 public:
    virtual void RTxDrawBackground(const TPoint& aDstPos, const TRect& aRect, CBitmapContext& gc) = 0;
 };
 class CMyAppContainer : public CCoeControl, public MRTxBackgroundDrawer
 void CMyAppContainer::RTxDrawBackground(const TPoint& aDstPos, const  TRect& aRect, CBitmapContext& gc)
 {
 #ifdef USE_SKIN
    MAknsSkinInstance* skin = AknsUtils::SkinInstance();
    MAknsControlContext* cc = AknsDrawUtils::ControlContext(this);
    AknsDrawUtils::DrawBackground(skin, cc, this, gc, TPoint(0, 0), aRect, KAknsDrawParamDefault);
 #else
    gc.SetPenStyle(CGraphicsContext::ENullPen);
    gc.SetBrushColor(KRgbBlue);
    gc.SetBrushStyle(CGraphicsContext::ESolidBrush);
    gc.DrawRect(aRect);
 #endif
 }
 
然后我们就可以通过以下 InsertPictureL()函数进行插入图片了。
 
 void CRTx::InsertPictureL(MRTxBackgroundDrawer& aControl, TInt aPos, CFbsBitmap& aBitmap, CFbsBitmap& aBitmapMask)
 {
    CRTxPicture* picture;
    
    picture = new(ELeave) CRTxPicture(iTextBox->GetSystemGc(), aControl, aBitmap, aBitmapMask);
    
    CleanupStack::PushL(picture);
    TPictureHeader header;
    header.iPicture = TSwizzle<CPicture>(picture);
    
    iTextBox->RichText()->InsertL(aPos, header);
    
    CleanupStack::Pop(); 
 }

在绘制背景时（RTxDrawBackground函数）使用了USE_SKIN来判断应用程序中的Editor是否使用了背景，因此如果使用了背景，需要在.mmp文件中加入以下语句： 

 MACRO USE_SKIN

完整的示例代码如下： 

///////////////////////////////
 // MyAppContainer.cpp (parts)
 ///////////////////////////////
 
 #include <eikclbd.h>
 #include <akniconarray.h>
 #include <gulicon.h>
 #include <AknIconUtils.h>
 #include "RTx.h"
 #include <MyAppmif.mbg>
 #include "MyAppDocument.h"
 #include "MyAppViewDevices.h"
 #include "MyAppContainer.h"
 
 #ifdef USE_SKIN
 #include <AknsDrawUtils.h>
 #include <AknsBasicBackgroundControlContext.h>
 #endif
 
 #define LKMyAppMIF L"\\resource\\apps\\myapp.mif"
 
 CMyAppContainer::CMyAppContainer(CMyAppViewDevices* aView) : iView(aView)
 {
 }
 
 CMyAppContainer::~CMyAppContainer()
 {
    delete iRTx;
    delete iTextBox;
    for(int i = 0; i < iBitmap->Count(); i++)
        delete iBitmap->At(i);
    delete iBitmap;
    for(int i = 0; i < iBitmapMask->Count(); i++)
        delete iBitmapMask->At(i);
    delete iBitmapMask;
 #ifdef USE_SKIN
    delete iBackGround;
 #endif
 }
 
 void CMyAppContainer::LoadBitmapListL()
 {
    _LIT(KMyAppMif, KMyAppMIF);
    PrepareBitmapL(KMyAppMif, EMbmMyAppmifImage, EMbmMyAppmifImage_mask);  // the image (bitmap or svg)
 }
 
 void CMyAppContainer::AddSomeTextAndImageL()
 {
    _LIT(KText1, "Hello World!");
 
    iRTx->AddTextL(KText1);
    iRTx->AddCarriageReturnL();
    iRTx->AddPictureL(*this, *(iBitmap->At(0)), *(iBitmapMask->At(0)));
 }
 
 void CMyAppContainer::ConstructL(const TRect& aRect)
 {
    CreateWindowL();
 
    iBitmap = new (ELeave) CArrayFixFlat<CFbsBitmap *>(1);
    iBitmapMask = new (ELeave) CArrayFixFlat<CFbsBitmap *>(1);
 
    LoadBitmapListL();
 
    iTextBox = new (ELeave) CRTxEditor(TGulBorder::ENone);
    iTextBox->SetMopParent(this);
    iRTx = new (ELeave) CRTx(iTextBox);
 
    TInt edwinFlags = EEikEdwinInclusiveSizeFixed|EEikEdwinNoAutoSelection|EEikEdwinDisplayOnly|EEikEdwinReadOnly|
        EEikEdwinLineCursor|EEikEdwinNoHorizScrolling|EEikEdwinAvkonDisableCursor;
 
    iTextBox->ConstructL(this, 0, 0, edwinFlags,EGulFontControlAll, EGulAllFonts);
    iTextBox->SetAknEditorFlags(edwinFlags);
 
    iTextBox->SetContainerWindowL(*this);
    iTextBox->SetFocus(ETrue);
 
    AddSomeTextAndImageL(); 
    
    SetRect(aRect);
 #ifdef USE_SKIN
    iBackGround = CAknsBasicBackgroundControlContext::NewL( KAknsIIDQsnBgAreaMain, Rect(), EFalse );
 #endif
    ActivateL();
 }
 
 void CMyAppContainer::SizeChanged()
 {
    TRect r = Rect();
    if (iTextBox)
    {
        TSize scr = CEikonEnv::Static()->ScreenDevice()->SizeInPixels();
        iTextBox->SetExtent(TPoint(0, 0), TSize(r.Width(), r.Height()));
    }
 }
 
 void CMyAppContainer::HandleResourceChange(TInt aType)
 {
    CCoeControl::HandleResourceChange(aType);
    if (aType == KEikDynamicLayoutVariantSwitch)
    {
        SetRect(iView->ClientRect());
    }
 }
 
 void CMyAppContainer::Draw(const TRect& aRect) const
 {
    CWindowGc& gc = SystemGc();
 #ifdef USE_SKIN
    MAknsSkinInstance* skin = AknsUtils::SkinInstance();
    MAknsControlContext* cc = AknsDrawUtils::ControlContext(this);
    AknsDrawUtils::Background(skin, cc, this, gc, aRect);
 #else
    gc.SetPenStyle(CGraphicsContext::ENullPen);
    gc.SetBrushColor(KRgbBlue);
    gc.SetBrushStyle(CGraphicsContext::ESolidBrush);
    gc.DrawRect(aRect);
 #endif
 }
 
 TInt CMyAppContainer::CountComponentControls() const
 {
    return 1;
 }
 
 CCoeControl* CMyAppContainer::ComponentControl(TInt aIndex) const
 {
    switch (aIndex)
    {
    case 0:
        return iTextBox;
    default:
        return NULL;
    }
 }
 
 TKeyResponse CMyAppContainer::OfferKeyEventL(const TKeyEvent& keyEvent, TEventCode type)
 {
    if (type != EEventKey )
        return EKeyWasNotConsumed;
 
    switch (keyEvent.iCode)
    {
    case EKeyLeftArrow:
    case EKeyRightArrow:
        return EKeyWasNotConsumed;
    }
    return iRTx->OfferKeyEventL(keyEvent, type);
 }
 
 // from MRTxBackgroundDrawer
 void CMyAppContainer::RTxDrawBackground(const TPoint& aDstPos, const  TRect& aRect, CBitmapContext& gc)
 {
 #ifdef USE_SKIN
    MAknsSkinInstance* skin = AknsUtils::SkinInstance();
    MAknsControlContext* cc = AknsDrawUtils::ControlContext(this);
    AknsDrawUtils::DrawBackground(skin, cc, this, gc, TPoint(0, 0), aRect, KAknsDrawParamDefault);
 #else
    gc.SetPenStyle(CGraphicsContext::ENullPen);
    gc.SetBrushColor(KRgbBlue);
    gc.SetBrushStyle(CGraphicsContext::ESolidBrush);
    gc.DrawRect(aRect);
 #endif
 }
 
 #ifdef USE_SKIN
 TTypeUid::Ptr CMyAppContainer::MopSupplyObject(TTypeUid aId)
 {
    if (aId.iUid == MAknsControlContext::ETypeId && iBackGround)
        return MAknsControlContext::SupplyMopObject(aId, iBackGround);
    return CCoeControl::MopSupplyObject(aId);
 }
 #endif
 
 void CMyAppContainer::PrepareBitmapL(const TDesC& aFileName, TInt aId, TInt aIdMask)
 {
    CFbsBitmap* bitmap, *bitmap_mask;
    AknIconUtils::CreateIconL(bitmap, bitmap_mask, aFileName, aId, aIdMask);
    TSize scr = CEikonEnv::Static()->ScreenDevice()->SizeInPixels();
    TSize iconSize(scr.iWidth / 2, scr.iWidth / 3); // sample resizing - depends on the image
    AknIconUtils::SetSize(bitmap, iconSize, EAspectRatioNotPreserved);
    AknIconUtils::SetSize(bitmap_mask, iconSize, EAspectRatioNotPreserved);
    iBitmap->AppendL(bitmap);
    iBitmapMask->AppendL(bitmap_mask);
 }
///////////////////////////////
 // RTxBackgroundDrawer.h       
 ///////////////////////////////
 
 /* Leszek Buczkowski, Ingraal 2006 */
 
 #ifndef __RTX_BACKGROUND_DRAWER_H__
 #define __RTX_BACKGROUND_DRAWER_H__
 
 class MRTxBackgroundDrawer
 {
 public:
    virtual void RTxDrawBackground(const TPoint& aDstPos, const TRect& aRect, CBitmapContext& gc) = 0;
 };
 
 #endif
///////////////////////////////
 // RTxPicture.h                
 ///////////////////////////////
 
 /* Leszek Buczkowski, Ingraal 2006 */
 
 #ifndef __RTX_PICTURE_H__
 #define __RTX_PICTURE_H__
 
 #include <gdi.h>
 
 class CWindowGc;
 class TSize;
 class CFbsBitmap;
 class MRTxBackgroundDrawer;
 
 class CRTxPicture : public CPicture
 {
 public:  // no destructor - bitmap not owned
    CRTxPicture(CWindowGc& gc, MRTxBackgroundDrawer& aControl, CFbsBitmap& aBitmap, CFbsBitmap& aBitmapMask);
 
 public: 
    TBool LineBreakPossible(TUint aClass, TBool aBeforePicture, TBool aHaveSpaces) const {return EFalse;};
    void Draw(CGraphicsContext& aGc, const TPoint& aTopLeft, const TRect& aClipRect, MGraphicsDeviceMap* aMap) const;
    void ExternalizeL(RWriteStream& aStream) const {};
    void GetOriginalSizeInTwips(TSize& aSize) const {aSize = iSizeInTwips;};
 
 protected:
    TSize iSizeInTwips;
    MRTxBackgroundDrawer& iControl;
    CFbsBitmap* iBitmap;
    CFbsBitmap* iBitmapMask;
 };
 
 #endif
///////////////////////////////
 // RTxPicture.cpp              
 ///////////////////////////////
 
 /* Leszek Buczkowski, Ingraal 2006 */
 
 #include <fbs.h>
 #include <w32std.h>
 #include "RTxPicture.h"
 #include "RTxBackgroundDrawer.h"
 
 #ifdef USE_SKIN
 #include <AknsDrawUtils.h>
 #include <AknsBasicBackgroundControlContext.h>
 #endif
 
 CRTxPicture::CRTxPicture(CWindowGc& gc, MRTxBackgroundDrawer& aControl,  CFbsBitmap& aBitmap, CFbsBitmap& aBitmapMask) : iControl(aControl), iBitmap(&aBitmap), iBitmapMask(&aBitmapMask)
 {
    TSize sizeInPixels = gc.Device()->SizeInPixels();
    TSize sizeInTwips = gc.Device()->SizeInTwips();
    TSize bitmapSizeInPixels = aBitmap.SizeInPixels();
    iSizeInTwips = TSize(sizeInTwips.iWidth * bitmapSizeInPixels.iWidth / sizeInPixels.iWidth, sizeInTwips.iHeight * bitmapSizeInPixels.iHeight / sizeInPixels.iHeight);
 }
 
 void CRTxPicture::Draw(CGraphicsContext& aGc, const TPoint& aTopLeft, const TRect& aClipRect, MGraphicsDeviceMap* aMap) const
 {
    CBitmapContext& gc = static_cast<CBitmapContext &>(aGc);
    TRect bmpPieceRect(TPoint(0,0),iBitmap->SizeInPixels());
    
    // here is the skin background drawn
    iControl.RTxDrawBackground(aTopLeft, bmpPieceRect, gc);
 
    // then the picture itself
    gc.BitBltMasked(aTopLeft, iBitmap, bmpPieceRect, iBitmapMask, ETrue);
 }
///////////////////////////////                 
 // RTx.h                       
 ///////////////////////////////
 
 /* Leszek Buczkowski, Ingraal 2006 */
 
 #ifndef __RTX_H__
 #define __RTX_H__
 
 #include <e32base.h>
 #include <gdi.h>
 #include <coedef.h>
 #include <w32std.h>
 #include <txtfrmat.h>
 #include <eikrted.h>
 #include <txtrich.h>
 #include "RTxBackgroundDrawer.h"
 
 class CWindowGc;
 class CFbsBitmap;
  
 // CRTxEditor is derived from CEikRichTextEditor in order to make  protected GetSystemGc available
 // as public (used in CRTx::InsertPictureL)
 class CRTxEditor : public CEikRichTextEditor
 {
 public:
    CRTxEditor(const TGulBorder& aBorder) { iBorder = aBorder; };
    CWindowGc& GetSystemGc() const { return SystemGc(); };
 };
 
 class CRTx : public CBase
 {
 public:
    CRTx(CRTxEditor* aTextBox);
    ~CRTx();
    TKeyResponse OfferKeyEventL(const TKeyEvent& aKeyEvent,TEventCode aType);
    void AddCarriageReturnL();
    void AddTextL (const TDesC& aText);
    void InsertPictureL(MRTxBackgroundDrawer& aControl, TInt aPos, CFbsBitmap& aBitmap, CFbsBitmap& aBitmapMask);
    void AddPictureL(MRTxBackgroundDrawer& aControl, CFbsBitmap& aBitmap, CFbsBitmap& aBitmapMask);
 
 private: 
    CRTxEditor* iTextBox;
    TCharFormatMask iCharFormatMask;
    TCharFormat iCharFormat;
 };
 
 #endif
///////////////////////////////
 // RTx.cpp                     
 ///////////////////////////////
 
 /* Leszek Buczkowski, Ingraal 2006 */
 
 #include "RTx.h"
 #include "RTxPicture.h"
 #include <eikrted.h>
 #include <txtrich.h>
 
 CRTx::CRTx(CRTxEditor* aTextBox)
 {
    iTextBox = aTextBox;
 }
 
 CRTx::~CRTx()
 {
 }
 
 void CRTx::AddCarriageReturnL()
 {
    CRichText* richText = iTextBox->RichText();
    richText->InsertL(richText->DocumentLength(), CEditableText::ELineBreak);
    iTextBox->HandleTextChangedL();
 }
 
 void CRTx::AddTextL(const TDesC& aText)
 {
    CRichText* richText = iTextBox->RichText();
    TInt documentLength = richText->DocumentLength();
    richText->InsertL (documentLength, aText);
    richText->ApplyCharFormatL(iCharFormat, iCharFormatMask,documentLength,aText.Length());
    iTextBox->HandleTextChangedL();
 }
 
 void CRTx::InsertPictureL(MRTxBackgroundDrawer& aControl, TInt aPos, CFbsBitmap& aBitmap, CFbsBitmap& aBitmapMask)
 {
    CRTxPicture* picture;
    picture = new(ELeave) CRTxPicture(iTextBox->GetSystemGc(), aControl, aBitmap, aBitmapMask);
    CleanupStack::PushL(picture);
    TPictureHeader header;
    header.iPicture = TSwizzle<CPicture>(picture);
    iTextBox->RichText()->InsertL(aPos, header);
    CleanupStack::Pop(); 
 }
 
 void CRTx::AddPictureL(MRTxBackgroundDrawer& aControl, CFbsBitmap& aBitmap, CFbsBitmap& aBitmapMask)
 {
    CRichText* richText = iTextBox->RichText();
    TInt documentLength = richText->DocumentLength();
    InsertPictureL(aControl, documentLength, aBitmap, aBitmapMask);
 }
 
 TKeyResponse CRTx::OfferKeyEventL(const TKeyEvent& aKeyEvent,TEventCode aType)
 {
    if (aType == EEventKey)
    {
        if (aKeyEvent.iCode == EKeyDownArrow)
        {
            iTextBox->MoveCursorL (TCursorPosition::EFPageDown, EFalse);
            return EKeyWasConsumed;
        }
        else if (aKeyEvent.iCode == EKeyUpArrow)
        {
            iTextBox->MoveCursorL (TCursorPosition::EFPageUp, EFalse);
            return EKeyWasConsumed;
        }
        else
        {
            return iTextBox->OfferKeyEventL(aKeyEvent, aType);
        }
    }
    return EKeyWasNotConsumed;
 }

best regards

davey_2

Retrieved from "http://wiki.forum.nokia.com/index.php/%E5%9C%A8%E6%96%87%E6%9C%AC%28CEikRichTextEditor%29%E4%B8%AD%E6%8F%92%E5%85%A5%E5%B8%A6%E8%83%8C%E6%99%AF%E7%9A%84%E5%9B%BE%E7%89%87"
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