author | hgs |
Fri, 23 Jul 2010 20:41:04 +0530 | |
changeset 52 | a3a4c0de738e |
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/* |
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* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: Window to a list of objects |
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* |
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*/ |
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#ifndef C_GLXLISTWINDOW_H |
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#define C_GLXLISTWINDOW_H |
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#include <e32base.h> |
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/** |
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* Interface to get, setup and cleanup objects that go into a list window |
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* Not strictly a factory, as also handles cleanup |
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*/ |
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class MGlxWindowObjectFactory |
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{ |
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public: |
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/** |
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* Creates an object that the list window will contain |
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* (not called NewObjectL since signature would be too similar to CGlxListWindowBase::NewObjectL) |
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* @return an object to be put into the window |
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*/ |
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virtual CBase* CreateObjectL() const = 0; |
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/** |
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* Makes the object at the index ready for use |
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* This is called when the object is added to the window |
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*/ |
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virtual void SetupObject( TInt aListIndex, CBase& aObject ) = 0; |
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/** |
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* Makes the object at the index ready for removal |
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* If your object builds links from other objects to it, use this |
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* function to remove those links. The object will be removed from |
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* the window after this function returns, and may be deleted or reused. |
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*/ |
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virtual void CleanupObject( TInt aListIndex, CBase& aObject ) = 0; |
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}; |
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class CGlxDataWindow; |
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/** |
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* Iterator that iterates through the items in a window |
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*/ |
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class TGlxWindowIterator |
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{ |
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public: |
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/** Constructor. Not exported since CGlxDataWindow is internal. */ |
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TGlxWindowIterator( const CGlxDataWindow& aWindow ); |
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/** Copy constructor */ |
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IMPORT_C TGlxWindowIterator( const TGlxWindowIterator& aIterator ); |
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/** |
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* @return the current item index in the list and move to next |
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* or KErrNotFound if has reached the end of the list |
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*/ |
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IMPORT_C TInt operator++( TInt ); |
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private: |
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/// window being iterated |
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const CGlxDataWindow* iWindow; |
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/// current position of iteration |
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TInt iWindowIndex; |
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}; |
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/** |
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* CGlxListWindowBase |
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*/ |
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class CGlxListWindow : public CBase |
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{ |
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public: |
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/** Constructor */ |
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IMPORT_C CGlxListWindow( MGlxWindowObjectFactory& aObjectFactory ); |
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/** Second-phase constructor */ |
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IMPORT_C void ConstructL(); |
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/** Destructor */ |
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IMPORT_C ~CGlxListWindow(); |
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/** |
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* Cleans up the objects, so that the list window can be deleted |
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* If the objects contained in the window do not build any links |
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* from other objects to them, this function does not have to be called. |
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* In this case also your implementation of CleanupObject can be empty. |
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* |
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* Depending on usage, may not be necessary to call on destruction |
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* of the window's owner (e.g., when the whole app is being closed, |
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* removing links to other objects is usually unnecessary. However, |
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* if you are removing one list window but leaving others, then |
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* the list window should be cleaned up, assuming your implementation |
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* of CleanupObject has some code in it.) |
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* |
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* Cannot be called by the destructor of this class, as long as deriving |
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* classes implement MGlxWindowObjectFactory, since vtable would not |
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* be valid in the destructor |
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*/ |
52 | 111 |
IMPORT_C void CleanupL(); |
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|
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/** |
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* Updates range offset. The range is the span of indexes that defined |
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* which objects should exists as actual objects in the window (and which |
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* should be abstract in the form of indexes). The range is calculated |
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* as a number (aFrontOffset) of objects in the front of the focus index |
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* and as a number (aRearOffset) of objects after the focus index. |
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*/ |
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IMPORT_C void SetRangeOffsetsL( TInt aFrontOffset, TInt aRearOffset ); /// @todo depricated |
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IMPORT_C void SetRangeOffsetsL( TInt aFocusIndex, TInt aTotalSize, |
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TInt aFrontOffset, TInt aRearOffset ); |
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123 |
|
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/** @return an iterator that allows going through the items in the window */ |
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IMPORT_C TGlxWindowIterator Iterator() const; |
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126 |
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/** |
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* Sets the focus. |
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* @param aFocusIndex index of the object to be focused in the list |
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*/ |
52 | 131 |
/* @todo depricated */ IMPORT_C void SetFocusIndexL( TInt aFocusIndex ); |
132 |
IMPORT_C void SetFocusIndexL( TInt aFocusIndex, TInt aTotalSize ); |
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|
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/** |
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* Adds objects to the list. Updates window if necessary. |
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* The function assumes that the underlying data structure has |
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* already changed. |
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*/ |
52 | 139 |
/* @todo depricated */ IMPORT_C void AddObjectsL( TInt aFirstNewIndex, TInt aLastNewIndex ); |
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IMPORT_C void AddObjectsL( TInt aFocusIndex, TInt aTotalSize, |
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TInt aFirstNewIndex, TInt aLastNewIndex ); |
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142 |
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/** |
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* Removes objects from the list. Updates window if necessary. |
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* The function assumes that the underlying data structure has |
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* already changed. |
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*/ |
52 | 148 |
/* @todo depricated */ IMPORT_C void RemoveObjectsL( TInt aFirstRemovedIndex, TInt aLastRemovedIndex ); |
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IMPORT_C void RemoveObjectsL( TInt aFocusIndex, TInt aTotalSize, |
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TInt aFirstRemovedIndex, TInt aLastRemovedIndex ); |
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151 |
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/** |
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* Access to objects in window |
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* For iteration through items in the window use Iterator() |
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* @return a pointer to an object or NULL if not found |
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*/ |
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IMPORT_C CBase* At( TInt aIndex ); |
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IMPORT_C const CBase* At( TInt aIndex ) const; |
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|
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public: |
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/** Range of the window in the list */ |
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struct TRange |
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{ |
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TInt iStartIndex; |
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TInt iLength; |
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}; |
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private: |
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/** Type of chance that happened to the full list */ |
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enum TChangeType |
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{ |
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EChangeNone, |
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EChangeObjectsAdded, |
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EChangeObjectsRemoved |
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}; |
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/** Class to describe a change to the full list */ |
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class TChange // declare struct as class to avoid CodeScanner warning... |
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{ |
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public: |
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/** Constructor */ |
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TChange( TInt aNewFocusIndex, TInt aNewTotalSize, TChangeType aChangeType, |
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TInt aFirstChangedIndex, TInt aLastChangedIndex ); |
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TInt iNewFocusIndex; |
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TInt iNewTotalSize; |
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TChangeType iChangeType; |
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/// first index added or removed, depending on iChangeType |
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TInt iFirstChangedIndex; |
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/// last index added or removed, depending on iChangeType |
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TInt iLastChangedIndex; |
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}; |
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/** Update the window based on the change */ |
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void UpdateL( const TChange& aChange ); |
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/** Move objects from main window to working window, or object pool if not needed */ |
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void PopulateExistingAndUnuseOldL( const TChange& aChange ); |
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/** Populate main window with items from object pool */ |
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void PopulateNew(); |
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/** Make working window the main window and vice versa */ |
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void SwapWindows(); |
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/** @return an object from the object pool */ |
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CBase* UnusedObject(); |
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/** |
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* @return the index of the item at aIndex, when adjusted by the change, so |
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* that index keeps pointing to the same logical item. |
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*/ |
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TInt IndexAfterChange( TInt aIndex, const TChange& aChange ) const; |
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/** @return the first and last index of the range range */ |
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TRange Range( const TChange& aChange ) const; |
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private: |
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/** |
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* Position of the focus |
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* If not defined (=list empty) value is -1 |
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*/ |
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/// @todo remove as soon as possible, this is causing the focus change logic on remove/addition |
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/// to be specified in media list AND here |
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TInt iFocusIndex; |
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/** |
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* Front offset to focus for where window will start |
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* The window will start at position iFocusIndex + iFrontOffset |
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* (Although it may loop around the start and end of the list) |
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* Hence, iFrontOffset must be negative or zero |
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*/ |
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TInt iFrontOffset; |
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/** |
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* Front offset to focus for where window will end |
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* The window will end at position iFocusIndex + iRearOffset |
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* (Although it may loop around the start and end of the list) |
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* Hence, iRearOffset must be positive or zero |
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*/ |
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TInt iRearOffset; |
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/// Main window |
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CGlxDataWindow* iWindow; |
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/// Working window, used when the list is being updates |
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CGlxDataWindow* iWorkingWindow; |
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/// Unused objects pool |
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RPointerArray< CBase > iUnusedObjects; |
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/// Factory that creates, sets up and cleans up objects that are stored in the window |
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MGlxWindowObjectFactory& iObjectFactory; |
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__DECLARE_TEST; |
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}; |
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#endif // C_GLXLISTWINDOW_H |
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