Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_hello_world___app_view_8cpp_source.html
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<h1>examples/HelloWorld/HelloWorld_AppView.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 2000-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
<a name="l00004"></a>00004 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span>
<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
<a name="l00006"></a>00006 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
<a name="l00010"></a>00010 <span class="comment">//</span>
<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
<a name="l00012"></a>00012 <span class="comment">//</span>
<a name="l00013"></a>00013 <span class="comment">// Description:</span>
<a name="l00014"></a>00014 <span class="comment">// HelloWorld_CExampleAppView.cpp</span>
<a name="l00015"></a>00015 <span class="comment">// Source file for the implementation of the </span>
<a name="l00016"></a>00016 <span class="comment">// application view class - CExampleAppView</span>
<a name="l00017"></a>00017 <span class="comment">//</span>
<a name="l00018"></a>00018
<a name="l00019"></a>00019 <span class="preprocessor">#include "HelloWorld.h"</span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="comment">//</span>
<a name="l00022"></a>00022 <span class="comment">// Constructor for the view.</span>
<a name="l00023"></a>00023 <span class="comment">//</span>
<a name="l00024"></a>00024 CExampleAppView::CExampleAppView()
<a name="l00025"></a>00025 {
<a name="l00026"></a>00026 }
<a name="l00027"></a>00027
<a name="l00028"></a>00028
<a name="l00029"></a>00029 <span class="comment">// Static NewL() function to start the standard two</span>
<a name="l00030"></a>00030 <span class="comment">// phase construction.</span>
<a name="l00031"></a>00031 <span class="comment">//</span>
<a name="l00032"></a>00032 <a class="code" href="class_c_example_app_view.html">CExampleAppView</a>* CExampleAppView::NewL(<span class="keyword">const</span> TRect& aRect)
<a name="l00033"></a>00033 {
<a name="l00034"></a>00034 <a class="code" href="class_c_example_app_view.html">CExampleAppView</a>* <span class="keyword">self</span> = <span class="keyword">new</span>(ELeave) <a class="code" href="class_c_example_app_view.html">CExampleAppView</a>();
<a name="l00035"></a>00035 CleanupStack::PushL(<span class="keyword">self</span>);
<a name="l00036"></a>00036 <span class="keyword">self</span>->ConstructL(aRect);
<a name="l00037"></a>00037 CleanupStack::Pop();
<a name="l00038"></a>00038 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00039"></a>00039 }
<a name="l00040"></a>00040
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="comment">//</span>
<a name="l00043"></a>00043 <span class="comment">// Destructor for the view.</span>
<a name="l00044"></a>00044 <span class="comment">//</span>
<a name="l00045"></a>00045 CExampleAppView::~CExampleAppView()
<a name="l00046"></a>00046 {
<a name="l00047"></a>00047 <span class="keyword">delete</span> iExampleText;
<a name="l00048"></a>00048 }
<a name="l00049"></a>00049
<a name="l00050"></a>00050
<a name="l00051"></a>00051 <span class="comment">// Second phase construction.</span>
<a name="l00052"></a>00052 <span class="comment">//</span>
<a name="l00053"></a>00053 <span class="keywordtype">void</span> CExampleAppView::ConstructL(<span class="keyword">const</span> TRect& aRect)
<a name="l00054"></a>00054 {
<a name="l00055"></a>00055 <span class="comment">// Fetch the text from the resource file.</span>
<a name="l00056"></a>00056 iExampleText = iEikonEnv->AllocReadResourceL(R_EXAMPLE_TEXT_HELLO);
<a name="l00057"></a>00057 <span class="comment">// Control is a window owning control</span>
<a name="l00058"></a>00058 CreateWindowL();
<a name="l00059"></a>00059 <span class="comment">// Extent of the control. This is</span>
<a name="l00060"></a>00060 <span class="comment">// the whole rectangle available to application.</span>
<a name="l00061"></a>00061 <span class="comment">// The rectangle is passed to us from the application UI.</span>
<a name="l00062"></a>00062 SetRect(aRect);
<a name="l00063"></a>00063 <span class="comment">// At this stage, the control is ready to draw so</span>
<a name="l00064"></a>00064 <span class="comment">// we tell the UI framework by activating it.</span>
<a name="l00065"></a>00065 ActivateL();
<a name="l00066"></a>00066 }
<a name="l00067"></a>00067
<a name="l00068"></a>00068
<a name="l00069"></a>00069 <span class="comment">// Drawing the view - in this example, </span>
<a name="l00070"></a>00070 <span class="comment">// consists of drawing a simple outline rectangle</span>
<a name="l00071"></a>00071 <span class="comment">// and then drawing the text in the middle.</span>
<a name="l00072"></a>00072 <span class="comment">// We use the Normal font supplied by the UI.</span>
<a name="l00073"></a>00073 <span class="comment">//</span>
<a name="l00074"></a>00074 <span class="comment">// In this example, we don't use the redraw</span>
<a name="l00075"></a>00075 <span class="comment">// region because it's easier to redraw to</span>
<a name="l00076"></a>00076 <span class="comment">// the whole client area.</span>
<a name="l00077"></a>00077 <span class="comment">//</span>
<a name="l00078"></a>00078 <span class="keywordtype">void</span> CExampleAppView::Draw(<span class="keyword">const</span> TRect& <span class="comment">/*aRect*/</span>)<span class="keyword"> const</span>
<a name="l00079"></a>00079 <span class="keyword"> </span>{
<a name="l00080"></a>00080 <span class="comment">// Window graphics context</span>
<a name="l00081"></a>00081 CWindowGc& gc = SystemGc();
<a name="l00082"></a>00082 <span class="comment">// Area in which we shall draw</span>
<a name="l00083"></a>00083 TRect drawRect = Rect();
<a name="l00084"></a>00084 <span class="comment">// Font used for drawing text</span>
<a name="l00085"></a>00085 <span class="keyword">const</span> CFont* fontUsed;
<a name="l00086"></a>00086
<a name="l00087"></a>00087 <span class="comment">// Start with a clear screen</span>
<a name="l00088"></a>00088 gc.Clear();
<a name="l00089"></a>00089 <span class="comment">// Draw an outline rectangle (the default pen</span>
<a name="l00090"></a>00090 <span class="comment">// and brush styles ensure this) slightly</span>
<a name="l00091"></a>00091 <span class="comment">// smaller than the drawing area.</span>
<a name="l00092"></a>00092 drawRect.Shrink(10,10);
<a name="l00093"></a>00093 gc.DrawRect(drawRect);
<a name="l00094"></a>00094 <span class="comment">// Use the title font supplied by the UI</span>
<a name="l00095"></a>00095 fontUsed = iEikonEnv->TitleFont();
<a name="l00096"></a>00096 gc.UseFont(fontUsed);
<a name="l00097"></a>00097 <span class="comment">// Draw the text in the middle of the rectangle.</span>
<a name="l00098"></a>00098 TInt baselineOffset=(drawRect.Height() - fontUsed->HeightInPixels())/2;
<a name="l00099"></a>00099 gc.DrawText(*iExampleText,drawRect,baselineOffset,CGraphicsContext::ECenter, 0);
<a name="l00100"></a>00100 <span class="comment">// Finished using the font</span>
<a name="l00101"></a>00101 gc.DiscardFont();
<a name="l00102"></a>00102 }
<a name="l00103"></a>00103
<a name="l00104"></a>00104
<a name="l00105"></a>00105
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