fontsandtextdevicefontscontainer.cpp

来自「series60 应用程序开发的源代码 series60 应用程序开发的源代码」· C++ 代码 · 共 244 行

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

// INCLUDE FILES

// Class includes
#include "FontsAndTextDeviceFontsContainer.h"

// User includes
#include <eikenv.h>        // iEikonEnv
#include <eiksbfrm.h>    // CEikScrollBarFrame

// CONSTANTS

const TInt KMaxFontName = 20;
const TInt KFontSpecSize = 100;
const TInt KColorBlack = 215;
const TInt KTextLeftMarginFactor = 7;
const TInt KBaseLineIncrementer = 2;

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

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

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

/**
 * Symbian OS 2nd phase constructor.  
 * Creates a Window for the control to draw to.
 * Uses the screen graphics device to obtain the number of system fonts
 * Constructs scroll bar
 *
 * @param aMop The object provider for scroll bars
 * @param aRect The rectangle for this window
 */ 
void CFontsAndTextDeviceFontsContainer::ConstructL(MObjectProvider& aMop, const TRect& aRect)
{
    // Create the window.
    CreateWindowL();     
    SetRect(aRect);
    CCoeControl::SetMopParent(&aMop);

    // Obtain a pointer to the screen device and set up typeface support.
    iDeviceMap = iCoeEnv->ScreenDevice();
    iTypefaceSupport = new TTypefaceSupport();
    iNumTypefaces = iCoeEnv->ScreenDevice()->NumTypefaces();

    // Set up the scroll bar.
    iSBFrame = new (ELeave) CEikScrollBarFrame(this, this);
    iSBFrame->SetScrollBarVisibilityL(CEikScrollBarFrame::EOff, CEikScrollBarFrame::EOn);
    iSBFrame->SetTypeOfVScrollBar(CEikScrollBarFrame::EArrowHead);
    
    TRect rect = Rect();
    iVertModel.iScrollSpan = iNumTypefaces;
    iVertModel.iThumbSpan = 1;
    iVertModel.iThumbPosition = iCurrentScrollNum;

    TEikScrollBarFrameLayout layout;
    iSBFrame->TileL(&iHorizModel, &iVertModel, rect, rect, layout);
    iSBFrame->SetVFocusPosToThumbPos(iVertModel.iThumbPosition);
    ActivateL();    // Activate the control.
    iSBFrame->DrawScrollBarsNow();
}

/**
 * Standard C++ constructor
 *
 */
CFontsAndTextDeviceFontsContainer::CFontsAndTextDeviceFontsContainer() :
    iCurrentScrollNum(0)
{
}

/**
 * Destructor
 */ 
CFontsAndTextDeviceFontsContainer::~CFontsAndTextDeviceFontsContainer()
{   
    delete iTypefaceSupport;
    
    if (iSBFrame)
    {
        iSBFrame->SetScrollBarsDimmed(ETrue, ETrue);
        delete iSBFrame;
    }
}

/**
 *    The number of lodging CCoeControls
 *
 * @return The number of lodging CCoeControls (in this case the scroll bar)
 */
TInt CFontsAndTextDeviceFontsContainer::CountComponentControls() const
{
    return iSBFrame->CountComponentControls(); // return number of controls inside this container
}

/**
 *    Returns a particular lodging CCoeControl at index aIndex
 *
 * @param aIndex The index of the lodging control so it can be returned
 * @return The lodging CCoeControl at aIndex
 */
CCoeControl* CFontsAndTextDeviceFontsContainer::ComponentControl(TInt aIndex) const
{
    return iSBFrame->ComponentControl(aIndex);
}

/**
 *
 * This draw function loops through all the fonts on the device, using them
 * to draw a text string. This string is the name of the font itself.
 *
 * @param aRect The rectangular area of the control
 *
 */
void CFontsAndTextDeviceFontsContainer::Draw(const TRect& aRect) const
{
    // Clear the graphics context.
    CWindowGc& gc = SystemGc();
    gc.Clear();    

    // Set the pen colour to black.
    gc.SetPenColor(AKN_LAF_COLOR(KColorBlack));

    // Loop through the fonts and draw text to screen
    TBuf<KMaxFontName> fontName;
    CFont* fontToUse;
    TPoint textPoint(aRect.Width() / KTextLeftMarginFactor, 0);

    for (TInt i = iCurrentScrollNum; i < iNumTypefaces; i++)
    {
        // Get the i-th font on the device.
        iCoeEnv->ScreenDevice()->TypefaceSupport(*iTypefaceSupport, i);

        // Get the font name.
        fontName = iTypefaceSupport->iTypeface.iName.Des();

        // Create font specification.
        TFontSpec fontSpec(fontName, KFontSpecSize);
        iDeviceMap->GetNearestFontInTwips(fontToUse, fontSpec);
        
        // Increment baseline by two times height of font.
        textPoint.iY += (fontToUse->HeightInPixels() * KBaseLineIncrementer);

        // Draw text in font with graphics context.
        gc.UseFont(fontToUse);
        gc.DrawText(fontName, textPoint);
        gc.DiscardFont();
        iDeviceMap->ReleaseFont(fontToUse);
    }        
}

/**
 * Interface function of MEikScrollbarObserver. 
 * Called after a particular scroll bar event
 *
 * @param aScrollBar The scroll bar
 * @param aEventType The scroll bar event
 *
 */
void CFontsAndTextDeviceFontsContainer::HandleScrollEventL(CEikScrollBar* /*aScrollBar*/, TEikScrollEvent /*aEventType*/)
{
}

/**
 * Handles the application response to keypresses.
 * In this case it causes the scroll down effect allowing the user to 
 * see further fonts.
 *
 * @param aKeyEvent The key event
 * @param aType The type of key event from EEventKeyUp, EEventKey or EEventKeyDown
 *
 * @return Shows whether or not a key was pressed as determined by the function
 */
TKeyResponse CFontsAndTextDeviceFontsContainer::OfferKeyEventL(const TKeyEvent& aKeyEvent, TEventCode aType)
{
    if (aType != EEventKey)
    {
        return EKeyWasNotConsumed;
    }

    if ((aKeyEvent.iCode == EKeyDownArrow) || (aKeyEvent.iCode == EKeyUpArrow))
    {
        if (aKeyEvent.iCode == EKeyDownArrow)
        {
            if (iCurrentScrollNum < iNumTypefaces - 1)
            {
                iCurrentScrollNum++;
            }
        }
        else if (aKeyEvent.iCode == EKeyUpArrow)
        {
            if (iCurrentScrollNum > 0)
            {
                iCurrentScrollNum--;
            }
        }

        iVertModel.iThumbPosition = iCurrentScrollNum;
        DrawNow();
        iSBFrame->SetVFocusPosToThumbPos(iVertModel.iThumbPosition);    
        iSBFrame->DrawScrollBarsNow();
        return EKeyWasConsumed;
    }            
        
    return EKeyWasNotConsumed;
}

// End of File