author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Fri, 22 Jan 2010 18:26:19 +0000 | |
changeset 1 | 25a17d01db0c |
child 3 | 46218c8b8afa |
permissions | -rw-r--r-- |
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-1614B24F-5DB2-43AA-9A18-723BD61B8B4C" xml:lang="en"><title>Handling |
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key events in your application</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>The application framework offers key events to UI controls on the control |
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stack by calling <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aOfferKeyEventL%28const%20TKeyEvent%20%26amp%3b%2cTEventCode%29" format="application/java-archive"><parmname>CCoeControl::OfferKeyEventL()</parmname></xref> for each |
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UI control until the key event is consumed or until there are no more UI controls |
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on the control stack. To handle an event in a UI control, you must override <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html#%3a%3aCCoeControl%3a%3aOfferKeyEventL%28const%20TKeyEvent%20%26amp%3b%2cTEventCode%29" format="application/java-archive"><parmname>CCoeControl::OfferKeyEventL()</parmname></xref>. If a UI |
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control is a compound control, then forward key events to other controls within |
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the compound control. The control that consumes the event must be a <xref href="GUID-352850A9-227F-45DB-8DCD-C6268954B4ED.dita">window-owning control</xref>. |
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An example of an implementation is as follows:</p> |
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<codeblock id="GUID-D93EBAD0-6C04-4E97-ABE2-9999EAA6F442" xml:space="preserve">KeyResponse CMyAppView::OfferKeyEventL(const TKeyEvent& aKeyEvent, TEventCode aType) |
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{ |
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TKeyResponse response = EKeyWasNotConsumed; |
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//Check first that event type is EEventKey. It could be also |
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//EEventKeyUp or EEventKeyDown which just inform that some key |
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// is pressed or released. |
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if( aType == EEventKey ) |
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{ |
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// Take out the code of the key |
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TInt code = aKeyEvent.iCode; |
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TBuf< KMessageLength > buf; |
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buf.AppendNum( code ); |
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// Show the code |
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iEikonEnv->InfoMsg(buf); |
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// Forward the key event to the focused control |
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if( iListBox->IsFocused() ) |
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{ |
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response = iListBox->OfferKeyEventL( aKeyEvent, aType ); |
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} |
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else if( iEditView->IsFocused() ) |
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{ |
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response = |
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iEditView->OfferKeyEventL( aKeyEvent, aType ); |
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} |
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} |
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// Return the key consumption status |
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return response; |
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} |
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</codeblock> |
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<p><parmname>CMyAppView</parmname> is a window-owning compound control |
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and <parmname>iListBox</parmname> and <parmname>iEditView</parmname> are controls |
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inside <parmname>CMyAppView</parmname>. Key events are offered to controls |
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depending on the focus.</p> |
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<p>If your implementation consumes the event handed to it, you must return <parmname>EKeyWasConsumed</parmname>. |
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If your implementation does not process the event, your code must return <parmname>EKeyWasNotConsumed</parmname>. |
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The application framework continues to offer the event to controls registered |
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with the control stack from top to bottom until the event is consumed or until |
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there are no more controls, in which case the event is handed to the UI controller |
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by calling <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeAppUiClass.html#%3a%3aCCoeAppUi%3a%3aHandleKeyEventL%28const%20TKeyEvent%20%26amp%3b%2cTEventCode%29" format="application/java-archive"><parmname>CCoeAppUI::HandleKeyEventL()</parmname></xref> for the UI |
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controller. </p> |
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<p>Handle key events in your UI controller by overriding <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeAppUiClass.html#%3a%3aCCoeAppUi%3a%3aHandleKeyEventL%28const%20TKeyEvent%20%26amp%3b%2cTEventCode%29" format="application/java-archive"><parmname>CCoeAppUI::HandleKeyEventL()</parmname></xref>. An example |
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of an implementation is as follows:</p> |
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<codeblock id="GUID-3A2D3630-C28F-4165-8589-73AA4627D008" xml:space="preserve">TKeyResponse CMyViewAppUi::HandleKeyEventL( const TKeyEvent& aKeyEvent,TEventCode /*aType*/) |
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{ |
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if( iTabGroup == NULL ) |
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{ |
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return EKeyWasNotConsumed; |
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} |
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|
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TInt active = iTabGroup->ActiveTabIndex(); |
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TInt count = iTabGroup->TabCount(); |
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|
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switch( aKeyEvent.iCode ) |
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{ |
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case EKeyLeftArrow: |
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if ( active > 0 ) |
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{ |
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active--; |
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iTabGroup->SetActiveTabByIndex( active ); |
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// ActivateLocalViewL() is used to change the view. |
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// To change view from another application we would use ActivateViewL() |
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// Send an empty message |
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ActivateLocalViewL( TUid::Uid( iTabGroup->TabIdFromIndex( active ) ) ); |
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Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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84 |
} |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
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changeset
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85 |
break; |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
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86 |
case EKeyRightArrow: |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
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changeset
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87 |
if( ( active + 1 ) < count ) |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
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changeset
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88 |
{ |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
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changeset
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89 |
active++; |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
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changeset
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90 |
iTabGroup->SetActiveTabByIndex( active ); |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
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changeset
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91 |
// ActivateLocalViewL() is used to change the view. |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
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changeset
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92 |
// To change view from another application we would use ActivateViewL() |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
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changeset
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93 |
ActivateLocalViewL( TUid::Uid( iTabGroup->TabIdFromIndex( active ) ) ); |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
94 |
} |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
95 |
break; |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
96 |
default: |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
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changeset
|
97 |
return EKeyWasNotConsumed; |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
98 |
break; |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
99 |
} |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
100 |
|
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
101 |
return EKeyWasConsumed; |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
102 |
} |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
103 |
</codeblock> |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
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changeset
|
104 |
<p><parmname>CMyAppView</parmname> is a UI controller that is using key |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
105 |
events from the selection key of a mobile device to switch between two <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html" format="application/java-archive"><parmname>CAknView</parmname></xref>-derived |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
106 |
views. <parmname>EKeyLeftArrow</parmname> and <parmname>EKeyRightArrow</parmname> are |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
107 |
codes enumerated in <parmname>TKeyCode</parmname> and are contained in <parmname>KeyEvent.iCode</parmname>.</p> |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
108 |
<note> |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
109 |
<p>The above code snippet was taken from the <i>MyView</i> example application |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
110 |
provided in the <parmname>S60 Platform: Platform Application Views</parmname> package |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
111 |
available from <xref href="http://www.forum.nokia.com/info/sw.nokia.com/id/9c5f21fd-2162-42da-aaf6-17a59b943475/S60_Platform_Application_Views_v2_0_en.zip.html" scope="external">Forum Nokia</xref> . </p> |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
112 |
</note> |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
113 |
<p>For more information on <parmname>TKeyCode</parmname>, see <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Kernel_Architecture_2/e32keys.hGlobals.html#%3a%3aTKeyCode" format="application/java-archive"><parmname>TKeyCode</parmname></xref>.</p> |
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
114 |
</conbody></concept> |