Symbian 中开发浏览器控件-风林火山-搜狐空间

Symbian 中开发浏览器控件

2011-01-24 10:34

    Symbian中也可以开发内嵌浏览器控件，而且使用起来比较简单，效果也还可以接受。在SDK的example中，有个例子可以参考BrCtlSampleApp，里面有使用BrowserCtl的各种方式。

    简单点说，Symbian提供了个class CBrCtlInterface,在browserengine.lib中。下面把我写的一个简单的控件代码贴上。

    

#include <charconv.h>
#include <utf.h>
#include "BroswerCtl.h"

void CBroswerCtl::ConstructL(const TRect& aRect)
{
 CreateWindowL();
 SetRect(aRect);
 ActivateL();
 
 iCommandBase = TBrCtlDefs::ECommandIdBase;
 iBrCtlCapabilities = TBrCtlDefs::ECapabilityDisplayScrollBar | TBrCtlDefs::ECapabilityLoadHttpFw |
                          TBrCtlDefs::ECapabilityGraphicalHistory | TBrCtlDefs::ECapabilityGraphicalPage;
 TRect rect(Position(), Size());
 iBrCtlInterface = CreateBrowserControlL( this,
  rect,
  iBrCtlCapabilities,
  iCommandBase,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL);
}

CBroswerCtl::~CBroswerCtl()
{
 if (iBrCtlInterface)
 {
  delete iBrCtlInterface;
  iBrCtlInterface = NULL;
 }
}

TInt CBroswerCtl::CountComponentControls() const
{
 if (iBrCtlInterface)
  return 1;
 return 0;
}

CCoeControl* CBroswerCtl::ComponentControl(TInt aIndex) const
{
 switch (aIndex)
 {
 case 0:
  return iBrCtlInterface; // Could be NULL
 default:
  return NULL;
 }
}

void CBroswerCtl::Draw(const TRect& aRect) const
{
 CWindowGc& gc = SystemGc();
 gc.SetPenStyle(CGraphicsContext::ESolidPen);
 gc.SetBrushColor(KRgbGray);
 gc.SetBrushStyle(CGraphicsContext::ESolidBrush);
 gc.DrawRect(aRect);

 gc.DiscardFont();
}

void CBroswerCtl::SizeChanged()
{
 if (iBrCtlInterface)
 {
  iBrCtlInterface->SetRect(Rect());
 }
}

void CBroswerCtl::LoadingContentWithBuffer(const TDesC& aBuffer)
{
 _LIT(KHttpDummy, "http://dummy");
 _LIT8(KDataType, "text/html");
 
 HBufC8* temp8 =  HBufC8::NewL(256);
 TPtr8 bufferPtr(temp8->Des());
 CnvUtfConverter::ConvertFromUnicodeToUtf8(bufferPtr, aBuffer);
 TUid uid;
 uid.iUid = KCharacterSetIdentifierIso88591;
 TDataType dataType(KDataType);

 iBrCtlInterface->LoadDataL(KHttpDummy, bufferPtr, dataType, uid);
}

void CBroswerCtl::LoadingContentWithFile(const TDesC& aFileName)
{
 RFs rfs;
 RFile file;
 User::LeaveIfError(rfs.Connect());
 CleanupClosePushL(rfs);
 User::LeaveIfError(file.Open(rfs, aFileName, EFileShareReadersOnly));
 CleanupClosePushL(file);
 iBrCtlInterface->LoadFileL(file);
 CleanupStack::PopAndDestroy(2); // file, rfs
}

void CBroswerCtl::LoadingContentWithUrl(const TDesC& aUrl)
{
  iBrCtlInterface->LoadUrlL( aUrl );
}

void CBroswerCtl::CreateBasicBrowserControlL()
{
 
}
HBufC8* CBroswerCtl::ReadFileLC(const TDesC& aFileName)
{
 RFs rfs;
 RFile file;
 User::LeaveIfError(rfs.Connect());
 CleanupClosePushL(rfs);
 User::LeaveIfError(file.Open(rfs, aFileName, EFileRead));
 CleanupClosePushL(file);
 TInt size;
 User::LeaveIfError(file.Size(size));
 HBufC8* buf = HBufC8::NewLC(size);
 TPtr8 bufPtr(buf->Des());
 User::LeaveIfError(file.Read(bufPtr));
 CleanupStack::Pop(); // buf
 CleanupStack::PopAndDestroy(2); // file, rfs
 CleanupStack::PushL(buf);
 return buf;
}

#ifndef BROSWERCTL_H
#define BROSWERCTL_H

#include <coecntrl.h>
#include "BrCtlInterface.h"

class CBroswerCtl : public CCoeControl
{
public:
 
 void ConstructL(const TRect& aRect);
    ~CBroswerCtl();
   
    TInt CountComponentControls() const;
    CCoeControl* ComponentControl(TInt aIndex) const;
    void Draw(const TRect& aRect) const;
    void SizeChanged();
   
    void LoadingContentWithBuffer(const TDesC& aBuffer);
    void LoadingContentWithFile(const TDesC& aFileName);
    void LoadingContentWithUrl(const TDesC& aUrl);
    void CreateBasicBrowserControlL();
private:
    HBufC8* ReadFileLC(const TDesC& aFileName);
private:
    // Pointer to the browser control interface
    CBrCtlInterface* iBrCtlInterface;
    // Desired capabilities of the browser control
    TUint iBrCtlCapabilities;
    // Command Base
    TInt iCommandBase;
};
#endif

其他View中把这个类作为一个控件使用即可。