examples/Graphics/WS/Scroll/Base.cpp

/*
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  list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
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  may be used to endorse or promote products derived from this software
  without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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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