Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_e_com_calculator_appview_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/ForumNokia/EComCalculator/client/src/EComCalculatorAppview.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * ============================================================================</span>
<a name="l00003"></a>00003 <span class="comment"> * Name : CEComCalculatorAppView from EComCalculatorAppView.cpp</span>
<a name="l00004"></a>00004 <span class="comment"> * Part of : EComCalculator</span>
<a name="l00005"></a>00005 <span class="comment"> * Created : 17/11/2003 by Forum Nokia</span>
<a name="l00006"></a>00006 <span class="comment"> * Version : 1.0</span>
<a name="l00007"></a>00007 <span class="comment"> * Copyright: Nokia Corporation</span>
<a name="l00008"></a>00008 <span class="comment"> * ============================================================================</span>
<a name="l00009"></a>00009 <span class="comment"> */</span>
<a name="l00010"></a>00010
<a name="l00011"></a>00011
<a name="l00012"></a>00012 <span class="preprocessor">#include <barsread.h></span> <span class="comment">// for resource reader</span>
<a name="l00013"></a>00013 <span class="preprocessor">#include <eiklabel.h></span> <span class="comment">// for label controls</span>
<a name="l00014"></a>00014 <span class="preprocessor">#include <eikedwin.h></span> <span class="comment">// for CEikEdwin</span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="preprocessor">#include "EComCalculatorAppView.h"</span>
<a name="l00017"></a>00017 <span class="preprocessor">#include <EComCalculator.rsg></span> <span class="comment">// Generated from EComCalculator.rss</span>
<a name="l00018"></a>00018
<a name="l00019"></a>00019 <span class="comment">// Constants used in controls' position calculations</span>
<a name="l00020"></a>00020 <span class="keyword">const</span> TInt KXPos = 10; <span class="comment">//x position</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="comment">// Constants</span>
<a name="l00023"></a>00023 <span class="keyword">const</span> TInt KNumberOfControls = 5; <span class="comment">//Number of UI controls within this container</span>
<a name="l00024"></a>00024 <span class="keyword">const</span> TInt KBottomMargin = 10; <span class="comment">//The amount of space to leave to bottom</span>
<a name="l00025"></a>00025 <span class="keyword">const</span> TInt KResultSize = 128;
<a name="l00026"></a>00026
<a name="l00027"></a>00027 <span class="comment">// Constant texts</span>
<a name="l00028"></a>00028 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KLabelTextA,<span class="stringliteral">"Number A:"</span>);
<a name="l00029"></a>00029 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KLabelTextB,<span class="stringliteral">"Number B:"</span>);
<a name="l00030"></a>00030 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KTextEmpty, <span class="stringliteral">""</span>);
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="comment">// Enumarations</span>
<a name="l00033"></a>00033 <span class="keyword">enum</span> TControls
<a name="l00034"></a>00034 {
<a name="l00035"></a>00035 ELabelA,
<a name="l00036"></a>00036 EEdwinA,
<a name="l00037"></a>00037 ELabelB,
<a name="l00038"></a>00038 EEdwinB,
<a name="l00039"></a>00039 ELabelResult
<a name="l00040"></a>00040 };
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="comment">// Create instance of this compound control.</span>
<a name="l00043"></a><a class="code" href="class_c_e_com_calculator_app_view.html#a684da4b24db80dcf7dc41768e59d1435">00043</a> <a class="code" href="class_c_e_com_calculator_app_view.html">CEComCalculatorAppView</a>* <a class="code" href="class_c_e_com_calculator_app_view.html#a684da4b24db80dcf7dc41768e59d1435">CEComCalculatorAppView::NewL</a>(<span class="keyword">const</span> TRect& aRect)
<a name="l00044"></a>00044 {
<a name="l00045"></a>00045 <a class="code" href="class_c_e_com_calculator_app_view.html">CEComCalculatorAppView</a>* <span class="keyword">self</span> = <span class="keyword">new</span> (ELeave) <a class="code" href="class_c_e_com_calculator_app_view.html">CEComCalculatorAppView</a>;
<a name="l00046"></a>00046 CleanupStack::PushL(<span class="keyword">self</span>);
<a name="l00047"></a>00047 <span class="keyword">self</span>->ConstructL(aRect);
<a name="l00048"></a>00048 CleanupStack::Pop(<span class="keyword">self</span>);
<a name="l00049"></a>00049 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00050"></a>00050 }
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="comment">// Perform the second phase construction. Instantiate the owned controls.</span>
<a name="l00053"></a>00053 <span class="keywordtype">void</span> CEComCalculatorAppView::ConstructL(<span class="keyword">const</span> TRect& aRect)
<a name="l00054"></a>00054 {
<a name="l00055"></a>00055
<a name="l00056"></a>00056 <span class="comment">// Create a window for this application view</span>
<a name="l00057"></a>00057 CreateWindowL();
<a name="l00058"></a>00058
<a name="l00059"></a>00059 iLabelA = <span class="keyword">new</span> (ELeave) CEikLabel;
<a name="l00060"></a>00060 iLabelA->SetContainerWindowL(*<span class="keyword">this</span>);
<a name="l00061"></a>00061 iLabelA->SetTextL(KLabelTextA);
<a name="l00062"></a>00062
<a name="l00063"></a>00063 iLabelB = <span class="keyword">new</span> (ELeave) CEikLabel;
<a name="l00064"></a>00064 iLabelB->SetContainerWindowL(*<span class="keyword">this</span>);
<a name="l00065"></a>00065 iLabelB->SetTextL(KLabelTextB);
<a name="l00066"></a>00066
<a name="l00067"></a>00067 iLabelResult = <span class="keyword">new</span> (ELeave) CEikLabel;
<a name="l00068"></a>00068 iLabelResult->SetContainerWindowL(*<span class="keyword">this</span>);
<a name="l00069"></a>00069 iLabelResult->SetTextL(KTextEmpty);
<a name="l00070"></a>00070
<a name="l00071"></a>00071 TResourceReader reader;
<a name="l00072"></a>00072 iCoeEnv->CreateResourceReaderLC(reader, R_ECOMCALCULATOR_EDWIN);
<a name="l00073"></a>00073 iEdwinA = <span class="keyword">new</span> (ELeave) CEikEdwin;
<a name="l00074"></a>00074 iEdwinA->SetContainerWindowL(*<span class="keyword">this</span>);
<a name="l00075"></a>00075 iEdwinA->ConstructFromResourceL(reader);
<a name="l00076"></a>00076 CleanupStack::PopAndDestroy(); <span class="comment">// Resource reader</span>
<a name="l00077"></a>00077
<a name="l00078"></a>00078 iCoeEnv->CreateResourceReaderLC(reader, R_ECOMCALCULATOR_EDWIN);
<a name="l00079"></a>00079 iEdwinB = <span class="keyword">new</span> (ELeave) CEikEdwin;
<a name="l00080"></a>00080 iEdwinB->SetContainerWindowL(*<span class="keyword">this</span>);
<a name="l00081"></a>00081 iEdwinB->ConstructFromResourceL(reader);
<a name="l00082"></a>00082 CleanupStack::PopAndDestroy(); <span class="comment">// Resource reader</span>
<a name="l00083"></a>00083
<a name="l00084"></a>00084 SizeChanged();
<a name="l00085"></a>00085 iEdwinA->SetFocus(ETrue);
<a name="l00086"></a>00086
<a name="l00087"></a>00087 <span class="comment">// Set the windows size</span>
<a name="l00088"></a>00088 SetRect(aRect);
<a name="l00089"></a>00089
<a name="l00090"></a>00090 <span class="comment">// Activate the window, which marks it ready to be drawn</span>
<a name="l00091"></a>00091 ActivateL();
<a name="l00092"></a>00092 }
<a name="l00093"></a>00093
<a name="l00094"></a>00094 <span class="comment">// Constructor.</span>
<a name="l00095"></a>00095 CEComCalculatorAppView::CEComCalculatorAppView()
<a name="l00096"></a>00096 :iLabelA(NULL), iLabelB(NULL),
<a name="l00097"></a>00097 iEdwinA(NULL), iEdwinB(NULL),
<a name="l00098"></a>00098 iLabelResult(NULL)
<a name="l00099"></a>00099 {
<a name="l00100"></a>00100 <span class="comment">// No implementation required</span>
<a name="l00101"></a>00101 }
<a name="l00102"></a>00102
<a name="l00103"></a>00103 <span class="comment">// Destructor. Release the owned controls</span>
<a name="l00104"></a><a class="code" href="class_c_e_com_calculator_app_view.html#a2d6525964ac2d79d908726c0a1611eef">00104</a> <a class="code" href="class_c_e_com_calculator_app_view.html#a2d6525964ac2d79d908726c0a1611eef">CEComCalculatorAppView::~CEComCalculatorAppView</a>()
<a name="l00105"></a>00105 {
<a name="l00106"></a>00106 <span class="keyword">delete</span> iLabelA;
<a name="l00107"></a>00107 <span class="keyword">delete</span> iLabelB;
<a name="l00108"></a>00108 <span class="keyword">delete</span> iEdwinA;
<a name="l00109"></a>00109 <span class="keyword">delete</span> iEdwinB;
<a name="l00110"></a>00110 <span class="keyword">delete</span> iLabelResult;
<a name="l00111"></a>00111 }
<a name="l00112"></a>00112
<a name="l00113"></a>00113 <span class="comment">// Draw the view. Called by framework, when necessary.</span>
<a name="l00114"></a>00114 <span class="keywordtype">void</span> CEComCalculatorAppView::Draw(<span class="keyword">const</span> TRect& aRect)<span class="keyword"> const</span>
<a name="l00115"></a>00115 <span class="keyword"> </span>{
<a name="l00116"></a>00116 <span class="comment">//Clear the screen</span>
<a name="l00117"></a>00117 CWindowGc& gc = SystemGc();
<a name="l00118"></a>00118 gc.Clear(Rect());
<a name="l00119"></a>00119 gc.SetBrushColor(KRgbGray);
<a name="l00120"></a>00120 gc.SetBrushStyle(CGraphicsContext::ESolidBrush);
<a name="l00121"></a>00121 gc.DrawRect(aRect);
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123
<a name="l00124"></a>00124 <span class="comment">// Scale the owned controls to reflect current (new) state</span>
<a name="l00125"></a>00125 <span class="keywordtype">void</span> CEComCalculatorAppView::SizeChanged()
<a name="l00126"></a>00126 {
<a name="l00127"></a>00127 TRect rect = Rect();
<a name="l00128"></a>00128
<a name="l00129"></a>00129 TInt bottom = rect.iBr.iY - KBottomMargin;
<a name="l00130"></a>00130 TInt comp_height = bottom/KNumberOfControls;
<a name="l00131"></a>00131
<a name="l00132"></a>00132 TPoint label_a_pos = TPoint(KXPos, bottom- comp_height*5);
<a name="l00133"></a>00133 TPoint edwin_a_pos = TPoint(KXPos, bottom- comp_height*4);
<a name="l00134"></a>00134 TPoint label_b_pos = TPoint(KXPos, bottom- comp_height*3);
<a name="l00135"></a>00135 TPoint edwin_b_pos = TPoint(KXPos, bottom- comp_height*2);
<a name="l00136"></a>00136 TPoint label_result_pos = TPoint(KXPos, bottom - comp_height);
<a name="l00137"></a>00137
<a name="l00138"></a>00138 iLabelA->SetExtent(label_a_pos, iLabelA->MinimumSize());
<a name="l00139"></a>00139 iLabelB->SetExtent(label_b_pos, iLabelB->MinimumSize());
<a name="l00140"></a>00140 iEdwinA->SetExtent(edwin_a_pos, iEdwinA->MinimumSize());
<a name="l00141"></a>00141 iEdwinB->SetExtent(edwin_b_pos, iEdwinB->MinimumSize());
<a name="l00142"></a>00142
<a name="l00143"></a>00143 <span class="comment">//Adjust the extent so it doesn't cut off y and p </span>
<a name="l00144"></a>00144 <span class="comment">//in "multiply", test with out this to see it</span>
<a name="l00145"></a>00145 TSize extent = iLabelResult->MinimumSize();
<a name="l00146"></a>00146 extent.iHeight += KBottomMargin;
<a name="l00147"></a>00147
<a name="l00148"></a>00148 iLabelResult->SetExtent(label_result_pos,
<a name="l00149"></a>00149 <span class="comment">//this cuts off the bottom of y and p in "multiply"</span>
<a name="l00150"></a>00150 <span class="comment">//iLabelResult->MinimumSize()); </span>
<a name="l00151"></a>00151 extent );
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153
<a name="l00154"></a>00154 <span class="comment">// Tell the framework the number of owned controls</span>
<a name="l00155"></a>00155 TInt CEComCalculatorAppView::CountComponentControls()<span class="keyword"> const</span>
<a name="l00156"></a>00156 <span class="keyword"> </span>{
<a name="l00157"></a>00157 <span class="keywordflow">return</span> KNumberOfControls;
<a name="l00158"></a>00158 }
<a name="l00159"></a>00159
<a name="l00160"></a>00160 <span class="comment">// Return owned control to framework so it will draw it.</span>
<a name="l00161"></a>00161 CCoeControl* CEComCalculatorAppView::ComponentControl(TInt aIndex)<span class="keyword"> const</span>
<a name="l00162"></a>00162 <span class="keyword"> </span>{
<a name="l00163"></a>00163 <span class="keywordflow">switch</span> (aIndex)
<a name="l00164"></a>00164 {
<a name="l00165"></a>00165 <span class="keywordflow">case</span> ELabelA: <span class="comment">// 0</span>
<a name="l00166"></a>00166 <span class="keywordflow">return</span> iLabelA;
<a name="l00167"></a>00167 <span class="keywordflow">case</span> EEdwinA: <span class="comment">// 1</span>
<a name="l00168"></a>00168 <span class="keywordflow">return</span> iEdwinA;
<a name="l00169"></a>00169 <span class="keywordflow">case</span> ELabelB: <span class="comment">// 2</span>
<a name="l00170"></a>00170 <span class="keywordflow">return</span> iLabelB;
<a name="l00171"></a>00171 <span class="keywordflow">case</span> EEdwinB: <span class="comment">// 3</span>
<a name="l00172"></a>00172 <span class="keywordflow">return</span> iEdwinB;
<a name="l00173"></a>00173 <span class="keywordflow">case</span> ELabelResult: <span class="comment">// 4</span>
<a name="l00174"></a>00174 <span class="keywordflow">return</span> iLabelResult;
<a name="l00175"></a>00175 <span class="keywordflow">default</span>:
<a name="l00176"></a>00176 <span class="keywordflow">return</span> NULL;
<a name="l00177"></a>00177 }
<a name="l00178"></a>00178 }
<a name="l00179"></a>00179
<a name="l00180"></a>00180 <span class="comment">// Handle key events. User of this view control must add this to control</span>
<a name="l00181"></a>00181 <span class="comment">// stack to ensure this component is able to get key events. In practise</span>
<a name="l00182"></a>00182 <span class="comment">// see how it is done in AppUI: CEComCalculatorAppUi::ConstructL()</span>
<a name="l00183"></a>00183 TKeyResponse CEComCalculatorAppView::OfferKeyEventL(<span class="keyword">const</span> TKeyEvent& aKeyEvent,
<a name="l00184"></a>00184 TEventCode aType)
<a name="l00185"></a>00185 {
<a name="l00186"></a>00186
<a name="l00187"></a>00187 <span class="comment">// Handle key up & down. Switch edit boxes, if appropriate</span>
<a name="l00188"></a>00188 <span class="keywordflow">switch</span> (aKeyEvent.iScanCode)
<a name="l00189"></a>00189 {
<a name="l00190"></a>00190 <span class="keywordflow">case</span> EStdKeyUpArrow:
<a name="l00191"></a>00191 <span class="keywordflow">if</span>(iEdwinB && iEdwinB->IsFocused())
<a name="l00192"></a>00192 {
<a name="l00193"></a>00193 iEdwinB->SetFocus(EFalse);
<a name="l00194"></a>00194 iEdwinA->SetFocus(ETrue);
<a name="l00195"></a>00195 <span class="keywordflow">return</span> EKeyWasConsumed;
<a name="l00196"></a>00196 }
<a name="l00197"></a>00197 <span class="keywordflow">break</span>;
<a name="l00198"></a>00198
<a name="l00199"></a>00199 <span class="keywordflow">case</span> EStdKeyDownArrow:
<a name="l00200"></a>00200 <span class="keywordflow">if</span>(iEdwinA && iEdwinA->IsFocused())
<a name="l00201"></a>00201 {
<a name="l00202"></a>00202 iEdwinA->SetFocus(EFalse);
<a name="l00203"></a>00203 iEdwinB->SetFocus(ETrue);
<a name="l00204"></a>00204 <span class="keywordflow">return</span> EKeyWasConsumed;
<a name="l00205"></a>00205 }
<a name="l00206"></a>00206 <span class="keywordflow">break</span>;
<a name="l00207"></a>00207 }
<a name="l00208"></a>00208
<a name="l00209"></a>00209 <span class="comment">// Let the focused edit box handle the key event</span>
<a name="l00210"></a>00210 <span class="keywordflow">if</span> (iEdwinA && iEdwinA->IsFocused())
<a name="l00211"></a>00211 {
<a name="l00212"></a>00212 <span class="keywordflow">return</span> iEdwinA->OfferKeyEventL(aKeyEvent, aType);
<a name="l00213"></a>00213 }
<a name="l00214"></a>00214 <span class="keywordflow">if</span> (iEdwinB && iEdwinB->IsFocused())
<a name="l00215"></a>00215 {
<a name="l00216"></a>00216 <span class="keywordflow">return</span> iEdwinB->OfferKeyEventL(aKeyEvent, aType);
<a name="l00217"></a>00217 }
<a name="l00218"></a>00218
<a name="l00219"></a>00219 <span class="keywordflow">return</span> EKeyWasNotConsumed;
<a name="l00220"></a>00220 }
<a name="l00221"></a>00221
<a name="l00222"></a>00222
<a name="l00223"></a>00223 <span class="comment">// Convert text in the edit box to a number.</span>
<a name="l00224"></a><a class="code" href="class_c_e_com_calculator_app_view.html#a26b6acd4cea10ef2c8bd4724f284c6f9">00224</a> TInt <a class="code" href="class_c_e_com_calculator_app_view.html#a26b6acd4cea10ef2c8bd4724f284c6f9">CEComCalculatorAppView::GetA</a>(TReal &aResult)<span class="keyword"> const</span>
<a name="l00225"></a>00225 <span class="keyword"> </span>{
<a name="l00226"></a>00226 TInt err = KErrGeneral;
<a name="l00227"></a>00227 <span class="keywordflow">if</span>(iEdwinA)
<a name="l00228"></a>00228 {
<a name="l00229"></a>00229 TLex16 lex(iEdwinA->Text()->Read(0));
<a name="l00230"></a>00230 err = lex.Val(aResult);
<a name="l00231"></a>00231 }
<a name="l00232"></a>00232 <span class="keywordflow">return</span> err;
<a name="l00233"></a>00233 }
<a name="l00234"></a>00234
<a name="l00235"></a>00235 <span class="comment">// Convert text in the edit box to a number.</span>
<a name="l00236"></a><a class="code" href="class_c_e_com_calculator_app_view.html#a8ade2ea0aa3f0ca7f99086ab3fc86433">00236</a> TInt <a class="code" href="class_c_e_com_calculator_app_view.html#a8ade2ea0aa3f0ca7f99086ab3fc86433">CEComCalculatorAppView::GetB</a>(TReal &aResult)<span class="keyword"> const</span>
<a name="l00237"></a>00237 <span class="keyword"> </span>{
<a name="l00238"></a>00238 TInt err = KErrGeneral;
<a name="l00239"></a>00239 <span class="keywordflow">if</span>(iEdwinB)
<a name="l00240"></a>00240 {
<a name="l00241"></a>00241 TLex16 lex(iEdwinB->Text()->Read(0));
<a name="l00242"></a>00242 err = lex.Val(aResult);
<a name="l00243"></a>00243 }
<a name="l00244"></a>00244 <span class="keywordflow">return</span> err;
<a name="l00245"></a>00245 }
<a name="l00246"></a>00246
<a name="l00247"></a>00247 <span class="comment">// Update text in iLabelResult. Show result of calculation</span>
<a name="l00248"></a><a class="code" href="class_c_e_com_calculator_app_view.html#ab71438832dbc68110ebaefd1c42c5c19">00248</a> <span class="keywordtype">void</span> <a class="code" href="class_c_e_com_calculator_app_view.html#ab71438832dbc68110ebaefd1c42c5c19">CEComCalculatorAppView::ShowResultL</a>(<span class="keyword">const</span> TDesC8& aOperationName,
<a name="l00249"></a>00249 TReal aValue)
<a name="l00250"></a>00250 {
<a name="l00251"></a>00251 TRealFormat format;
<a name="l00252"></a>00252 TBuf<KResultSize> resultStr;
<a name="l00253"></a>00253 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KSeparator,<span class="stringliteral">": "</span>);
<a name="l00254"></a>00254 resultStr.Copy(aOperationName);
<a name="l00255"></a>00255 resultStr.Append(KSeparator);
<a name="l00256"></a>00256 resultStr.AppendNum(aValue,format);
<a name="l00257"></a>00257 iLabelResult->SetTextL(resultStr);
<a name="l00258"></a>00258 SizeChanged();
<a name="l00259"></a>00259 DrawDeferred();
<a name="l00260"></a>00260 }
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