examples/Graphics/WS/Simple/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
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Description:  
*/


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


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

void CWindow::ConstructL (const TRect& aRect, CWindow* aParent)
        {
        // 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);
        iWindow=RWindow(iClient->iWs); // use app's session to window server
        User::LeaveIfError(iWindow.Construct(*parent,(TUint32)this));
        iRect = aRect;
        iWindow.SetExtent(iRect.iTl, iRect.Size()); // set extent relative to group coords
        iWindow.Activate(); // window is now active
        }


CWindow::~CWindow()
        {
        iWindow.Close(); // close our window
        }

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

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



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
        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(rect);
                window->Draw(rect);
                window->Window().EndRedraw();
                iClient->iGc->Deactivate();
                }
        // maintain outstanding request
        IssueRequest();
        }


CWsClient::CWsClient()
        : CActive(CActive::EPriorityHigh)
        {
        }

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)); // meaningless handle; enable focus
        // 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();
        // 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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