scalablescreendrawingcontrol.cpp

一个界面绘图的例子

// ScalableScreenDrawingControl.cpp
// ---------------------
//

////////////////////////////////////////////////////////////////////////
//
// Source file for the implementation of the
// control class - CScalableScreenDrawingControl
//
////////////////////////////////////////////////////////////////////////

#include <eikenv.h>
#include <aknutils.h>
#include "akndef.h"
#include <e32svr.h>

#include "ScalableScreenDrawingControl.h"

// Second-phase constructor creates the engine object.
void CScalableScreenDrawingControl::ConstructL(const TRect& /*aRect*/, CAknViewAppUi* aAppUi)
    {
	CreateWindowL();
	SetExtentToWholeScreen();

	iBlizzardEngine = new (ELeave) CScalableScreenDrawingEngine (iEikonEnv->WsSession(), aAppUi);
	iBlizzardEngine->ConstructL(Window(),CCoeEnv::Static()->ScreenDevice());

	ActivateL();
    }

// Destructor
CScalableScreenDrawingControl::~CScalableScreenDrawingControl()
    {
	delete iBlizzardEngine;
    }

// We don't have any sub-controls
TInt CScalableScreenDrawingControl::CountComponentControls() const
    {
	return 0;
    }

// Empty implementation
void CScalableScreenDrawingControl::HandleControlEventL(CCoeControl* /*aControl*/, TCoeEvent /*aEventType*/)
    {
    }

// Handle resource change event, here it is the event that occurs
// when screen mode changes.
void CScalableScreenDrawingControl::HandleResourceChange(TInt aType)
    {
	CCoeControl::HandleResourceChange(aType);

	if( aType == KEikDynamicLayoutVariantSwitch)
	    {
		iBlizzardEngine->ScaleImage();  // Tell engine to scale bitmaps accordingly
		SetExtentToWholeScreen();
	    }
    }

// This event handler detects key events and calls the engine accordingly
TKeyResponse CScalableScreenDrawingControl::OfferKeyEventL(const TKeyEvent &aKeyEvent, TEventCode aType)
	{
	if(aType == EEventKey)
		{
		if(aKeyEvent.iScanCode == EStdKeyUpArrow)
			{
			iBlizzardEngine->ArrowUp();
			return EKeyWasConsumed;
			}
		else if(aKeyEvent.iScanCode == EStdKeyDownArrow)
			{
			iBlizzardEngine->ArrowDown();
			return EKeyWasConsumed;
			}
		else if(aKeyEvent.iScanCode == EStdKeyEnter || aKeyEvent.iScanCode == EStdKeyDevice3)
			{
			iBlizzardEngine->EnterPress();
			return EKeyWasConsumed;
			}
		else if(aKeyEvent.iScanCode == EStdKeyHash)
			{
			iBlizzardEngine->ToggleDecorators();
			return EKeyWasConsumed;
			}
		}

	return EKeyWasNotConsumed;
	}

// End of file.