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examples/AppFramework/UIControls/CustomControls/CustomControls.cpp

// Copyright (c) 2000-2009 Nokia Corporation and/or its subsidiary(-ies).
// All rights reserved.
// This component and the accompanying materials are made available
// under the terms of "Eclipse Public License v1.0"
// which accompanies this distribution, and is available
// at the URL "http://www.eclipse.org/legal/epl-v10.html".
//
// Initial Contributors:
// Nokia Corporation - initial contribution.
//
// Contributors:
//
// Description:
// UI Control Framework example program
// This example demonstrates how to write new control classes.
// The example creates three new control classes:
// 1. CSmiley              - a simple control which displays a 
// smiley face that can have two moods,
// happy and sad. The user can change
// the smiley's mood by pressing the
// space bar.
// 2. CSmileyContainer     - a compound control which contains
// two CSmiley controls, side by side.
// The user can move the keyboard focus
// from one CSmiley to the other using
// the arrow keys, or the pointer.
// 3. CMainWinControl      - a compound control which does nothing
// except act as a background window and a 
// container for other controls in the 
// application.
// When the application starts up, it creates a CMainWinControl to cover
// the entire screen, and a CSmileyContainer inside this main window.
// The application's menu contains just two options. One of them closes 
// the application; the other creates a dialog which contains a 
// CSmileyContainer. CSmileyContainer therefore illustrates how to write 
// a control that can be created both in a dialog and within the
// application's main view.
//

#include "CustomControls.h"
#include <eikstart.h>


//
// -----> CMainWinControl(implementation)
//
CMainWinControl::CMainWinControl()
        {
        }

CMainWinControl::~CMainWinControl()
        {
        delete iContainer;
        }

// CMainWinControl needs a ConstructL(), because it is a compound control
// (and a window-owning control).
void CMainWinControl::ConstructL(const TRect& rect)
        {
        // Make this a window-owning control.
        CreateWindowL();
        SetRect(rect);

        // Create its only component, a CSmileyContainer
        iContainer = new(ELeave) CSmileyContainer;
        iContainer->SetContainerWindowL(*this);
        TRect containerRect=Rect();
        iContainer->ConstructL(containerRect);
        // Activate the main window control - this will also activate the 
        // CSmileyContainer and its components.
        ActivateL();
        DrawNow();
        }

// The following two functions have to be implemented for all compound controls.
TInt CMainWinControl::CountComponentControls() const
        {
        return 1;
        }

CCoeControl* CMainWinControl::ComponentControl(TInt /*aIndex*/) const
        {
        return iContainer;
        }

// Draw the main window.
void CMainWinControl::Draw(const TRect& /*aRect*/) const
        {
        CWindowGc& gc=SystemGc();
        gc.SetBrushColor(KRgbWhite);
        gc.Clear(Rect());
        }

// CSmileyContainer can't be put on the control stack, because it's a component of this 
// control. The main window control goes on the stack and passes on any key events it gets
// to the CSmileyContainer.
TKeyResponse CMainWinControl::OfferKeyEventL(const TKeyEvent& aKeyEvent, TEventCode aType)
        {
        return (iContainer->OfferKeyEventL(aKeyEvent, aType));
        }

//
// -----> CSmileyContainer (implementation)
//
CSmileyContainer::CSmileyContainer()
        {}

        
CSmileyContainer::~CSmileyContainer()
        {
          // Delete all the contained controls 
        delete iSmiley1;
        delete iSmiley2;
        }


// Because CSmileyContainer is a compound control, it needs a
// ConstructL() for when it's created outside a dialog, and a
// ConstructFromResourceL() for when it's created inside a dialog.
void CSmileyContainer::ConstructL(const TRect& aRect)
        {
        TBool isSmiling=ETrue;

        // Create the two CSmileys. Their size and position is 
        // set in CSmileyContainer::SizeChangedL().
        iSmiley1 = new(ELeave) CSmiley(isSmiling);
        iSmiley1->SetContainerWindowL(*this);

        isSmiling=EFalse;

        iSmiley2 = new(ELeave) CSmiley(isSmiling);
        iSmiley2->SetContainerWindowL(*this);

        iSmiley1->SetFocus(ETrue);

        // Set the container as the observer of the two CSmileys. This 
        // is for handling keyboard focus. When an arrow key is pressed 
        // or the pointer is clicked on one of the CSmileys, an 
        // EEventRequestFocus event is sent to the container, and the
        // container changes the focus if applicable.
        iSmiley1->SetObserver(this);
        iSmiley2->SetObserver(this);

        // Set the bounding rectangle of this control (this will result in 
        // a call to SizeChangedL(). The component controls must be 
        // created before calling this, because SizeChangedL() sets their
        // sizes.
        SetRect(aRect);
        }


// This function is used when the CSmileyContainer is created inside a dialog.
void CSmileyContainer::ConstructFromResourceL(TResourceReader& aReader)
        {
        // Read the smiley mood from the resource file
        TBool isSmiling=(TBool)aReader.ReadInt8();
        // Read the width of the smiley container from the resource file.
        TInt width=aReader.ReadInt16();
        // Set the height of the container to be half its width
        TSize containerSize (width, width/2);

        iSmiley1 = new(ELeave) CSmiley(isSmiling);
        iSmiley1->SetContainerWindowL(*this);

        iSmiley2 = new(ELeave) CSmiley(isSmiling);
        iSmiley2->SetContainerWindowL(*this);

        iSmiley1->SetFocus(ETrue);

        iSmiley1->SetObserver(this);
        iSmiley2->SetObserver(this);

        SetSize(containerSize);

        ActivateL();    
        }

// The following two functions have to be implemented for all compound controls.
TInt CSmileyContainer::CountComponentControls() const
        {
        return 2;
        }

CCoeControl* CSmileyContainer::ComponentControl(TInt aIndex) const
        {
        if (aIndex==0)
                return iSmiley1;
        else
                return iSmiley2;
        }

// This function gets called whenever one of the size-setting functions is called.
// As this is a compound control, this function calculates and sets the size and  
// position for its components, based on its own size.
void CSmileyContainer::SizeChanged()
    {
        TInt containerWidth=Size().iWidth;
        TInt containerHeight=Size().iHeight;
        // Find half of the greater - width or height
        TInt length=containerHeight>containerWidth ? containerWidth/4 : containerHeight/4; 
        TSize smileySize(length,length);

        // Do some preliminary calculations so that Draw() is as short
        // as possible.
        TInt xOffset=smileySize.iWidth/4; // x offset from the center
        TInt yOffset=(containerHeight - smileySize.iHeight) / 2;
        iSmiley1->SetPosition(Position() +
                TPoint(containerWidth/2 - smileySize.iWidth - xOffset, yOffset));
        iSmiley2->SetPosition(Position() + 
                TPoint(containerWidth/2 + xOffset, yOffset));
        // Calling SetSizeL() causes the components' SizeChanged() to be called.
        iSmiley1->SetSize(smileySize);
        iSmiley2->SetSize(smileySize);
        }
        
void CSmileyContainer::Draw(const TRect& aRect) const
        {
        // Just draw a rectangle round the edge of the control.
        CWindowGc& gc=SystemGc();
        gc.Clear(aRect);
        gc.SetClippingRect(aRect);
        gc.DrawRect(Rect());
        }

// This function is defined by MCoeControlObserver. It gets called whenever
// a control that this control is observing calls ReportEventL().
// In this example, the CSmileyContainer is the observer for both of the 
// CSmileys.  CCoeControl::ProcessPointerEventL() calls ReportEvent(), 
// sending an event of type EEventRequestFocus, whenever an EButton1Down event
// occurs in the CSmiley that doesn't currently have focus.
void CSmileyContainer::HandleControlEventL(CCoeControl* aControl,
                                                                                TCoeEvent aEventType)
        {
        switch (aEventType)
                {
                case EEventRequestFocus:
                        {
                        if (aControl->IsFocused())
                                return;
                        SwapFocus(aControl);
                        }
                        break;
                default:
                        break;
                }
        }

// This function is called by the framework whenever a component in a dialog is 
// about to lose focus. It checks that the data in ithe component is valid. In
// this example, there's a "rule" that both the CSmileys in the container can't
// be miserable! If they are, the function leaves. The framework issues the message 
// we give it, and doesn't move focus away from the CSmileyContainer.
void CSmileyContainer::PrepareForFocusLossL()   
        {
        if (!iSmiley1->IsSmiling() && !iSmiley2->IsSmiling())
                {
                CEikonEnv::Static()->LeaveWithInfoMsg(R_EXAMPLE_TEXT_VALIDATE);
                }
        }

// This function gets called whenever the application calls SetFocus().
// It redraws the CSmileyContainer, so that they are updated to show 
// which one now has focus.
void CSmileyContainer::FocusChanged(TDrawNow aDrawNow)
        {
        if (IsFocused())
                {
                iSmiley1->SetFocus(ETrue, EDrawNow);
                }
        else
                {
                        if (iSmiley1->IsFocused())
                        iSmiley1->SetFocus(EFalse, EDrawNow);
                        else
                        iSmiley2->SetFocus(EFalse, EDrawNow);
                }
        if (aDrawNow)
                DrawNow();
        }


void CSmileyContainer::SwapFocus(CCoeControl* aControl)
        {
        if (aControl==iSmiley1)
                {
                iSmiley2->SetFocus(EFalse, EDrawNow);
                iSmiley1->SetFocus(ETrue, EDrawNow);
                }
        else
                {
                iSmiley1->SetFocus(EFalse, EDrawNow);
                iSmiley2->SetFocus(ETrue, EDrawNow);
                }
        }

TKeyResponse CSmileyContainer::OfferKeyEventL(const TKeyEvent& aKeyEvent,TEventCode aType)
        {
        // Use the arrow keys to move focus between the two CSmileys.
        switch (aKeyEvent.iScanCode)
                {
                case EStdKeySpace:
                        if (iSmiley1->IsFocused())
                                return iSmiley1->OfferKeyEventL(aKeyEvent, aType);
                        else if (iSmiley2->IsFocused())
                                return iSmiley2->OfferKeyEventL(aKeyEvent, aType);
                        break;
                case EStdKeyRightArrow:
                        if (iSmiley1->IsFocused())
                                SwapFocus(iSmiley2);
                        else
                        return EKeyWasConsumed;
                        break;
                case EStdKeyLeftArrow:
                        if (iSmiley2->IsFocused())
                                SwapFocus(iSmiley1);
                        else
                        return EKeyWasConsumed;
                        break;
                default:
                        break;
                }
        // If the CSmileyContainer didn't use the key event, it must return EKeyWasNotConsumed,
        // so that the key event is passed to other controls on the stack.
        return EKeyWasNotConsumed;
        }




//
// -----> CSmiley (implementation)
//

// CSmiley doesn't need a ConstructL() because it's a simple control.

CSmiley::CSmiley(TBool aSmiling) : iSmiling(aSmiling)
        {
        }

CSmiley::~CSmiley()
        {
        }

TBool CSmiley::IsSmiling()
        {
        return iSmiling;
        }

void CSmiley::Draw(const TRect& aRect) const
        {
        CWindowGc& gc=SystemGc();
        if (IsFocused())
                {
                gc.SetPenColor(KRgbBlack);
                }
        else
                {
                gc.SetPenColor(KRgbWhite);
                }
        gc.SetBrushColor(KRgbWhite);
        gc.Clear(Rect());
        gc.DrawRect(Rect());

        gc.SetClippingRect(aRect);

        // Draw the smiley face, smiling or looking sad
        gc.SetPenColor(KRgbBlack);
        // Draw a circle for the face
        gc.DrawEllipse(iSmileyRect);
        // Draw the eyes
        TPoint leftEye(iSmileyWidth/3, iSmileyHeight/3);
        TPoint rightEye(iSmileyWidth*2/3, iSmileyHeight/3);
        gc.SetPenSize(TSize(5,5));
        gc.Plot(iSmileyRect.iTl+leftEye);
        gc.Plot(iSmileyRect.iTl+rightEye);
        //Draw the mouth, smiling or looking sad.
        gc.SetPenSize(TSize(1,1));
        gc.SetPenColor(KRgbWhite);
        if (iSmiling)
                gc.DrawArc(iFrownRect, iFrownRect.iTl+TPoint(iSmileyWidth/2,iFrownRect.Height()/2), 
                                                          iFrownRect.iTl+TPoint(0,iFrownRect.Height()/2));
        else
                gc.DrawArc(iSmileRect, iSmileRect.iTl+TPoint(0,iSmileRect.Height()/2), 
                                                          iSmileRect.iTl+TPoint(iSmileyWidth/2,iSmileRect.Height()/2));
        gc.SetPenColor(KRgbBlack);
        if (iSmiling)
                gc.DrawArc(iSmileRect, iSmileRect.iTl+TPoint(0,iSmileRect.Height()/2), 
                                                          iSmileRect.iTl+TPoint(iSmileyWidth/2,iSmileRect.Height()/2));
        else
                gc.DrawArc(iFrownRect, iFrownRect.iTl+TPoint(iSmileyWidth/2,iFrownRect.Height()/2), 
                                                          iFrownRect.iTl+TPoint(0,iFrownRect.Height()/2));
        }

void CSmiley::SizeChanged()
        {
        // Calculate sizes of rectangles for drawing face and mouth
        iSmileyRect=Rect();
        // Allow room for the focus rectangle round the outside
        iSmileyRect.Shrink(3,3);
        iSmileyWidth=iSmileyRect.Width();
        iSmileyHeight=iSmileyRect.Height();
        iSmileRect.SetRect(iSmileyRect.iTl+TPoint(iSmileyWidth/4, iSmileyHeight/2),
                                        TSize(iSmileyWidth/2, iSmileyHeight/3));
        iFrownRect.SetRect(iSmileyRect.iTl+TPoint(iSmileyWidth/4, iSmileyHeight*2/3),
                                        TSize(iSmileyWidth/2, iSmileyHeight/3));
        }

void CSmiley::FocusChanged(TDrawNow aDrawNow)
        {
        if (aDrawNow)
                DrawNow();
        }

void CSmiley::HandlePointerEventL(const TPointerEvent& aPointerEvent)
        {
        if (aPointerEvent.iType==TPointerEvent::EButton1Down)
                {
                iSmiling = !iSmiling;
                DrawNow();
                }
        }

TKeyResponse CSmiley::OfferKeyEventL(const TKeyEvent& aKeyEvent,TEventCode aType)
        {
        // The space bar changes the "mood" of the CSmiley.
        if (aType==EEventKey && aKeyEvent.iScanCode==EStdKeySpace)
                {
                iSmiling = !iSmiling;
                DrawNow();
                return EKeyWasConsumed;
                }
        else
                {
                return EKeyWasNotConsumed;
                }
        }

//
// -----> CSmileyDialog(implementation)
//
TBool CSmileyDialog::RunDlgLD()
        {
        CEikDialog* dialog = new (ELeave) CSmileyDialog();
        return (dialog->ExecuteLD(R_SMILEY_DIALOG));
        }

// This function is used by CEikForm::ConstructByTypeL() to create the custom 
// control within the dialog.
SEikControlInfo CSmileyDialog::CreateCustomControlL(TInt aControlType)
        {
        SEikControlInfo controlInfo;
        controlInfo.iControl = NULL;
        controlInfo.iTrailerTextId = 0;
        controlInfo.iFlags = 0;

    switch (aControlType)
        {
    case ESmileyControl:
                controlInfo.iControl = new(ELeave) CSmileyContainer;
                break;
        default:
                break;
                }
    return controlInfo;
        }

//
// -----> CExampleAppUi (implementation)
//
void CExampleAppUi::ConstructL()
        {
          // Allow base class (CEikAppUi) to perform necessary construction
        BaseConstructL();
        // Construct the CMainWinControl which forms the main view
        // for this application.
        iMainWinControl=new(ELeave) CMainWinControl;
        iMainWinControl->ConstructL(ClientRect());
        // The main window is added to the control stack (for key event
        // handling).   
        AddToStackL(iMainWinControl);
        }
        

CExampleAppUi::~CExampleAppUi()
        {
        RemoveFromStack(iMainWinControl);
          // Delete the main window
        delete iMainWinControl;
        }

void CExampleAppUi::HandleCommandL(TInt aCommand)
        {
          // Handle the command generated by:
          //   1. menu item selection
          //   2. short-cut key press
        switch (aCommand)
                {
        // EXIT comand
        case EEikCmdExit:
                OnCmdExit();
                break;
        case ECreateSmileyDialog:
                CSmileyDialog::RunDlgLD();
                break;
        default :
                break;
                }
        }

void CExampleAppUi::OnCmdExit()
        {
        CBaActiveScheduler::Exit();
        }

void CExampleAppUi::HandleModelChangeL()
        {
        }

//
// -----> CExampleDocument (implementation)
//

CExampleDocument::CExampleDocument(CEikApplication& aApp)
         : CEikDocument(aApp)
        {}

CExampleDocument::~CExampleDocument()
        {
        }

CExampleDocument* CExampleDocument::NewL(CEikApplication& aApp)
        {
        CExampleDocument* self=new(ELeave) CExampleDocument(aApp);
        CleanupStack::PushL(self);
        self->CreateModelL();
        CleanupStack::Pop();
        return self;
        }

void CExampleDocument::ResetModelL()
        {
        CreateModelL();
        }

void CExampleDocument::CreateModelL()
        {
        }

CEikAppUi* CExampleDocument::CreateAppUiL()
        {
    return(new(ELeave) CExampleAppUi);
        }

void CExampleDocument::NewDocumentL()
        {
        ResetModelL();
        }

void CExampleDocument::StoreL(CStreamStore& /*aStore*/,CStreamDictionary& /*aStreamDic*/) const
        {
        }

void CExampleDocument::RestoreL(const CStreamStore& /*aStore*/,const CStreamDictionary& /*aStreamDic*/)
        {
        }


//
// -----> CExampleApplication (implementation)
//
TUid CExampleApplication::AppDllUid() const
        {
        return(KUidExampleApp);
        }


CApaDocument* CExampleApplication::CreateDocumentL()
        {
        return CExampleDocument::NewL(*this);
        }


//
// EXPORTed functions
//


LOCAL_C CApaApplication* NewApplication()
        {
        return new CExampleApplication;
        }
        
GLDEF_C TInt E32Main()
        {
        return EikStart::RunApplication(NewApplication);
        }

---

Copyright ©2010 Nokia Corporation and/or its subsidiary(-ies).
All rights reserved. Unless otherwise stated, these materials are provided under the terms of the Eclipse Public License v1.0.