11 PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
11 PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
12 <concept id="GUID-BE871265-147B-45F3-8772-A4E091223EDB" xml:lang="en"><title>Constructing |
12 <concept id="GUID-BE871265-147B-45F3-8772-A4E091223EDB" xml:lang="en"><title>Constructing |
13 views in traditional architecture</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
13 views in traditional architecture</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
14 <p>The call on the first phase constructor method of the view occurs in <xref href="GUID-FD2CDEB8-0784-4BE5-A775-170F57D71BBC.dita">UI controller</xref>. The |
14 <p>The call on the first phase constructor method of the view occurs in <xref href="GUID-FD2CDEB8-0784-4BE5-A775-170F57D71BBC.dita">UI controller</xref>. The |
15 view serves as the top-level window under the UI controller.</p> |
15 view serves as the top-level window under the UI controller.</p> |
16 <p>The methods you need to implement for your <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html" format="application/java-archive"><parmname>CCoeControl</parmname></xref>-derived |
16 <p>The methods you need to implement for your <xref href="GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160.dita"><apiname>CCoeControl</apiname></xref>-derived |
17 view are as follows:</p> |
17 view are as follows:</p> |
18 <ul> |
18 <ul> |
19 <li><p>C++ default constructor, which cannot contain code that leaves. |
19 <li><p>C++ default constructor, which cannot contain code that leaves. |
20 A common implementation is:</p> |
20 A common implementation is:</p> |
21 <itemgroup> |
21 <itemgroup> |
44 CleanupStack::PushL( self ); |
44 CleanupStack::PushL( self ); |
45 self->ConstructL( aRect ); |
45 self->ConstructL( aRect ); |
46 return self; |
46 return self; |
47 } |
47 } |
48 </codeblock> |
48 </codeblock> |
49 <p>The declarations for <parmname>CMyAppView::NewL</parmname> and <parmname>CMyAppView::NewLC</parmname> in |
49 <p>The declarations for <parmname>CMyAppView::NewL()</parmname> and <parmname>CMyAppView::NewLC</parmname> in |
50 the class header file needs to be public to support the construction method |
50 the class header file needs to be public to support the construction method |
51 required. <parmname>CMyAppView</parmname> is the default constructor for the <parmname>CMyAppView</parmname> class |
51 required. <parmname>CMyAppView</parmname> is the default constructor for the <parmname>CMyAppView</parmname> class |
52 and it is private.</p> |
52 and it is private.</p> |
53 <p>In this approach, <parmname>CMyAppView::NewL</parmname> is called from |
53 <p>In this approach, <parmname>CMyAppView::NewL()</parmname> is called |
54 the UI controller. It creates a view object by calling <parmname>CMyAppView::NewLC</parmname>. <parmname>CMyAppView::NewLC</parmname> calls |
54 from the UI controller. It creates a view object by calling <parmname>CMyAppView::NewLC()</parmname>. <parmname>CMyAppView::NewLC()</parmname> calls |
55 new (<parmname>ELeave</parmname>) on the C++ default constructor <parmname>CMyAppView</parmname> to |
55 new (<parmname>ELeave</parmname>) on the C++ default constructor <parmname>CMyAppView</parmname> to |
56 create the object (and leave if it cannot), <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Kernel_Architecture_2/CCleanupClass.html#%3a%3aCCleanup%3a%3aPushL%28CBase%20%2a%29" format="application/java-archive">pushes</xref> a pointer to the clean-up stack in case the second phase construction method |
56 create the object (and leave if it cannot), <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Kernel_Architecture_2/CCleanupClass.html#%3a%3aCCleanup%3a%3aPushL%28CBase%20%2a%29" format="application/java-archive">pushes</xref> a pointer to the clean-up stack in case the second phase construction method |
57 leaves, and then calls the second phase construction method of the object. |
57 leaves, and then calls the second phase construction method of the object. |
58 When it returns to <parmname>CMyAppView::NewL</parmname>, the pointer pushed |
58 When it returns to <parmname>CMyAppView::NewL()</parmname>, the pointer pushed |
59 to the cleanup stack is <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Kernel_Architecture_2/CCleanupClass.html#%3a%3aCCleanup%3a%3aPop%28%29" format="application/java-archive">removed</xref>.</p> |
59 to the cleanup stack is <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Kernel_Architecture_2/CCleanupClass.html#%3a%3aCCleanup%3a%3aPop%28%29" format="application/java-archive">removed</xref>.</p> |
60 </itemgroup> |
60 </itemgroup> |
61 </li> |
61 </li> |
62 <li><p>Symbian 2nd phase constructor with code that might leave. |
62 <li><p>Symbian 2nd phase constructor with code that might leave. |
63 A common implementation is:</p> |
63 A common implementation is:</p> |
73 SetRect( aRect ); |
73 SetRect( aRect ); |
74 |
74 |
75 // Activate the window, which makes it ready to be drawn |
75 // Activate the window, which makes it ready to be drawn |
76 ActivateL(); |
76 ActivateL(); |
77 }</codeblock> |
77 }</codeblock> |
78 <p><parmname>CMyAppView::ConstructL</parmname> is a private class providing |
78 <p><parmname>CMyAppView::ConstructL()</parmname> is a private class providing |
79 the second phase construction that accepts the rectangle the view is drawn |
79 the second phase construction that accepts the rectangle the view is drawn |
80 to.</p> |
80 to.</p> |
81 <p><xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aCreateWindowL%28%29" format="application/java-archive"><parmname>CCoeControl::CreateWindowL</parmname></xref> creates a window |
81 <p><xref href="GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160.dita#GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160/GUID-03CC715F-11D8-39B1-875D-F4589BC9681E"><apiname>CCoeControl::CreateWindowL()</apiname></xref> creates a window for |
82 for the control. Note that this window is a child of the UI controller. This |
82 the control. Note that this window is a child of the UI controller. This method |
83 method makes the control a <xref href="GUID-352850A9-227F-45DB-8DCD-C6268954B4ED.dita">window-owning |
83 makes the control a <xref href="GUID-352850A9-227F-45DB-8DCD-C6268954B4ED.dita">window-owning |
84 control</xref>. While the use of window-owning controls is generally discouraged |
84 control</xref>. While the use of window-owning controls is generally discouraged |
85 to prevent the taxing of run-time resources, this is the top-level window |
85 to prevent the taxing of run-time resources, this is the top-level window |
86 for the UI controller.</p> |
86 for the UI controller.</p> |
87 <p>This is a simple control that does not contain other controls; other |
87 <p>This is a simple control that does not contain other controls; other |
88 controls could be added to the control between <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aCreateWindowL%28%29" format="application/java-archive"><parmname>CCoeControl::CreateWindowL</parmname></xref> and <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aSetRect%28const%20TRect%20%26amp%3b%29" format="application/java-archive"><parmname>CCoeControl::SetRect(aRect)</parmname></xref>. For more information, |
88 controls could be added to the control between <xref href="GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160.dita#GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160/GUID-03CC715F-11D8-39B1-875D-F4589BC9681E"><apiname>CCoeControl::CreateWindowL()</apiname></xref> and <xref href="GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160.dita#GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160/GUID-AC806401-86C7-308A-9D18-39085CB8D877"><apiname>CCoeControl::SetRect(aRect)</apiname></xref>. |
89 see <xref href="GUID-97486385-88F7-4AF1-B880-D9A8AA4D7094.dita">Compound |
89 For more information, see <xref href="GUID-97486385-88F7-4AF1-B880-D9A8AA4D7094.dita">Compound |
90 controls in traditional architecture</xref>.</p> |
90 controls in traditional architecture</xref>.</p> |
91 <p><xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aSetRect%28const%20TRect%20%26amp%3b%29" format="application/java-archive"><parmname>CCoeControl::SetRect(aRect)</parmname></xref> sets the window |
91 <p><xref href="GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160.dita#GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160/GUID-AC806401-86C7-308A-9D18-39085CB8D877"><apiname>CCoeControl::SetRect(aRect)</apiname></xref> sets the window size |
92 size according to the requirements of the mobile device. The top-level control |
92 according to the requirements of the mobile device. The top-level control |
93 rectangle is set to the area that the framework provides for the application. |
93 rectangle is set to the area that the framework provides for the application. |
94 Calling <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aSetRect%28const%20TRect%20%26amp%3b%29" format="application/java-archive"><parmname>CCoeControl::SetRect(aRect)</parmname></xref> calls the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aSizeChanged%28%29" format="application/java-archive"><parmname>CCoeControl::SizeChanged</parmname></xref> method, where |
94 Calling <xref href="GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160.dita#GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160/GUID-AC806401-86C7-308A-9D18-39085CB8D877"><apiname>CCoeControl::SetRect(aRect)</apiname></xref> calls the <xref href="GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160.dita#GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160/GUID-9D6A2C52-DCE0-3490-BDA1-323406B7FBCF"><apiname>CCoeControl::SizeChanged()</apiname></xref> method, |
95 the control should set the position and size for any child controls and thus |
95 where the control should set the position and size for any child controls |
96 adjust the control layout to the UI.</p> |
96 and thus adjust the control layout to the UI.</p> |
97 <p><xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aActivateL%28%29" format="application/java-archive"><parmname>CCoeControl::ActivateL</parmname></xref> sets the control |
97 <p><xref href="GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160.dita#GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160/GUID-C79D0B6F-C2D7-3F22-A62B-88762092E869"><apiname>CCoeControl::ActivateL()</apiname></xref> sets the control as ready |
98 as ready to be drawn.</p> |
98 to be drawn.</p> |
99 </itemgroup> |
99 </itemgroup> |
100 </li> |
100 </li> |
101 </ul> |
101 </ul> |
102 <p>If required for your application, you may need to implement other methods |
102 <p>If required for your application, you may need to implement other methods |
103 for your control. For top-level windows, you would need to implement <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aSizeChanged%28%29" format="application/java-archive"><parmname>CCoeControl::SizeChanged</parmname></xref> to respond to |
103 for your control. For top-level windows, you would need to implement <xref href="GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160.dita#GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160/GUID-9D6A2C52-DCE0-3490-BDA1-323406B7FBCF"><apiname>CCoeControl::SizeChanged()</apiname></xref> |
104 changes to the size and position of the contents of this control. This is |
104 to respond to changes to the size and position of the contents of this control. |
105 called by the platform when a change occurs. A typical implementation for |
105 This is called by the platform when a change occurs. A typical implementation |
106 a compound control is:</p> |
106 for a compound control is:</p> |
107 <codeblock id="GUID-A100010E-DF65-4EB7-AC5D-707604805976" xml:space="preserve">void CMyAppView::SizeChanged() |
107 <codeblock id="GUID-A100010E-DF65-4EB7-AC5D-707604805976" xml:space="preserve">void CMyAppView::SizeChanged() |
108 { |
108 { |
109 // Control resize code |
109 // Control resize code |
110 iControl->SetExtent( const TPoint &aPosition, const TSize &aSize); |
110 iControl->SetExtent( const TPoint &aPosition, const TSize &aSize); |
111 }</codeblock> |
111 }</codeblock> |