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examples/Graphics/WS/Scroll/Base.cpp

// Copyright (c) 2005-2009 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:
//

#include <w32std.h>
#include "Base.h"

//                                                      CWindow implementation

CWindow::CWindow(CWsClient* aClient)
        : iClient(aClient)
        {
        }

void CWindow::ConstructL (const TRect& aRect, const TRgb& aColor, CWindow* aParent)
        {
        _LIT(KFontName,"Swiss");
        // If a parent window was specified, use it; if not, use the window group
        // (aParent defaults to 0).
        RWindowTreeNode* parent= aParent ? (RWindowTreeNode*) &(aParent->Window()) : &(iClient->iGroup);
        // Allocate and construct the window
        iWindow=RWindow(iClient->iWs);
        User::LeaveIfError(iWindow.Construct(*parent,(TUint32)this));
        // Store the window's extent
        iRect = aRect;
        // Set up the new window's extent
        iWindow.SetExtent(iRect.iTl, iRect.Size());
        // Set its background color
        iWindow.SetBackgroundColor (aColor);
        // Set up font for displaying text
        TFontSpec fontSpec(KFontName,200);
        User::LeaveIfError(iClient->iScreen->GetNearestFontInTwips(iFont,fontSpec));
        // Activate the window
        iWindow.Activate();
        }

CWindow::~CWindow()
        {
        iWindow.Close();
        iClient->iScreen->ReleaseFont(iFont);
        }

RWindow& CWindow::Window()
        {
        return iWindow;
        }

CWindowGc* CWindow::SystemGc()
        {
        return iClient->iGc;
        }

CWsScreenDevice* CWindow::Screen()
        {
        return iClient->iScreen;
        }

CFont* CWindow::Font()
        {
        return iFont;
        }


//                                                      CWsRedrawer implementation

CWsRedrawer::CWsRedrawer()
        : CActive(CActive::EPriorityLow)
        {
        }

void CWsRedrawer::ConstructL(CWsClient* aClient)
        {
        iClient=aClient; // remember WsClient that owns us
        CActiveScheduler::Add(this); // add ourselves to the scheduler
        IssueRequest(); // issue request to draw
        }

CWsRedrawer::~CWsRedrawer()
        {
        Cancel();
        }

void CWsRedrawer::IssueRequest()
        {
        iClient->iWs.RedrawReady(&iStatus);
        SetActive();
        }

void CWsRedrawer::DoCancel()
        {
        iClient->iWs.RedrawReadyCancel();
        }

void CWsRedrawer::RunL()
        {       
        // find out what needs to be done in response to the event
        TWsRedrawEvent redrawEvent;
    iClient->iWs.GetRedraw(redrawEvent); // get event
        CWindow* window=(CWindow*)(redrawEvent.Handle()); // get window
        if (window)
                {
                TRect rect=redrawEvent.Rect(); // and rectangle that needs redrawing
                // now do drawing
                iClient->iGc->Activate(window->Window());
                window->Window().BeginRedraw();
                window->Draw(rect);
                window->Window().EndRedraw();
                iClient->iGc->Deactivate();
                }
        // maintain outstanding request
        IssueRequest();
        }


//                                                              CWsClient implementation
CWsClient::CWsClient()
        : CActive(CActive::EPriorityStandard)
        {
        }

void CWsClient::ConstructL()
        {
        // add ourselves to active scheduler 
        CActiveScheduler::Add(this);
        // get a session going
        User::LeaveIfError(iWs.Connect());
        // construct our one and only window group
        iGroup=RWindowGroup(iWs);
        User::LeaveIfError(iGroup.Construct(2,ETrue)); // '2' is a meaningless handle
        // construct screen device and graphics context
        iScreen=new (ELeave) CWsScreenDevice(iWs); // make device for this session
        User::LeaveIfError(iScreen->Construct()); // and complete its construction
        User::LeaveIfError(iScreen->CreateContext(iGc)); // create graphics context
        // construct redrawer
        iRedrawer=new (ELeave) CWsRedrawer;
        iRedrawer->ConstructL(this);
        // construct main window
        ConstructMainWindowL();
        // request first event and start scheduler
        IssueRequest();
        }

CWsClient::~CWsClient()
        {
        // neutralize us as an active object
        Deque(); // cancels and removes from scheduler
        // get rid of everything we allocated
        delete iGc;
        delete iScreen;
        delete iRedrawer;
        // destroy window group
        iGroup.Close(); // what's the difference between this and destroy?
        // finish with window server
        iWs.Close();
        }

void CWsClient::IssueRequest()
        {
        iWs.EventReady(&iStatus); // request an event
        SetActive(); // so we're now active
        }

void CWsClient::DoCancel()
        {
        iWs.EventReadyCancel(); // cancel event request
        }

void CWsClient::ConstructMainWindowL()
        {
        }

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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.