author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 17 Dec 2009 08:56:02 +0200 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007 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: Navigation interface for list-like widgets. |
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* |
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*/ |
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#ifndef I_ALFNAVIGATION_H |
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#define I_ALFNAVIGATION_H |
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#include <alf/ialfinterfacebase.h> |
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namespace Alf |
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{ |
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|
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namespace alfnavigation |
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{ |
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static const IfId ident = |
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{ |
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0, "alfnavigation" |
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}; |
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} |
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|
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/** |
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* An interface that defines functionality for navigation in a |
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* one-dimensional array of items. In addition to the normal |
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* one-dimansional behavior, a common use case is to have |
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* a two-dimensional layout and navigation model for the items. |
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* Therefore, both one- and two-dimensional navigation models are |
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* supported by the interface. |
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* |
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* Since the logical behavior is decoupled from the presentation, |
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* the navigation is controlled in terms of logical dimensions, |
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* namely the primary and the secondary dimensions. The primary |
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* dimension is the dimension in which the navigation space |
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* expands when new items are inserted. In a one-dimensional layout, |
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* only the primary dimension is needed. The secondary dimension |
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* is used with two-dimensional layouts and navigation models. |
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* The size of the navigation space in the secondary dimension |
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* should be a constant. |
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* |
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* The navigation interface consists of navigation parameters, |
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* scrolling parameters, and orientation parameters. The navigation |
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* parameters are used to control the focused item in the logical |
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* navigation events. The scrolling parameters are used to send |
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* scrolling events according to the focused item. The orientation |
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* parameters are used to convert directional navigation events |
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* to the logical navigation events. In addition, the usage of |
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* default navigation key events, i.e., arrow keys, can be enabled |
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* or disabled. |
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* |
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* @lib alfwidgetmodel.lib |
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* @since S60 ?S60_version |
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* @status Draft |
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*/ |
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class IAlfNavigation : public IAlfInterfaceBase |
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{ |
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public: |
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/** |
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* Getter for the type identifier of this interface. |
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* |
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* @since S60 ?S60_version |
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* @return A descriptor to identify the type of this interface. |
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*/ |
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static inline const IfId& type() |
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{ |
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return alfnavigation::ident; |
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} |
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|
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/** |
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* Getter for the index of the currently focused item. |
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* |
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* @since S60 ?S60_version |
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* @return An index of the currently focused item. |
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*/ |
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virtual int focusedIndex() const = 0; |
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|
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/** |
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* Setter for the index of the currently focused item. |
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* If the given index is outside the range of items, |
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* the index is set to the first or the last index. |
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* |
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* @since S60 ?S60_version |
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* @param aIndex The new index of the focused item. |
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*/ |
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virtual void setFocusedIndex( int aIndex ) = 0; |
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|
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/** |
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* Getter for the size of the page in primary dimension. |
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* The page size is used for EEventNavigatePrimaryPageUp and |
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* EEventNavigatePrimaryPageDown events, as well as for scrolling |
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* in primary dimension. |
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* |
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* @since S60 ?S60_version |
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* @return The page size in primary dimension. |
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*/ |
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virtual int primaryPageSize() const = 0; |
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|
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/** |
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* Getter for the size of the page in secondary dimension. |
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* The page size is used for EEventNavigateSecondaryPageUp and |
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* EEventNavigateSecondaryPageDown events, as well as for scrolling |
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* in secondary dimension. |
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* |
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* @since S60 ?S60_version |
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* @return The page size in secondary dimension. |
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*/ |
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virtual int secondaryPageSize() const = 0; |
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|
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/** |
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* Getter for the size of the navigation space in secondary dimension. |
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* One step in the primary dimension changes the index of the focused |
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* item by the secondary size. The size is also used for scrolling |
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* in secondary dimension. The secondary size of a one-dimensional |
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* list should be one. |
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* |
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* @since S60 ?S60_version |
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* @return The size in secondary dimension. |
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*/ |
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virtual int secondarySize() const = 0; |
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|
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/** |
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* Getter for looping in primary dimension. |
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* |
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* @since S60 ?S60_version |
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* @return <code>true</code> if the looping is enabled, |
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* <code>false</code> otherwise. |
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*/ |
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virtual bool primaryLooping() const = 0; |
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|
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/** |
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* Getter for looping in secondary dimension. |
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* |
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* @since S60 ?S60_version |
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* @return <code>true</code> if the looping is enabled, |
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* <code>false</code> otherwise. |
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*/ |
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virtual bool secondaryLooping() const = 0; |
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|
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/** |
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* Set the navigation parameters for one-dimensional navigation. |
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* The secondary size and the secondary page size are set to one, |
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* to indicate that navigation and scrolling in secondary direction |
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* is disabled. Also the secondary looping is disabled. |
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* |
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* @since S60 ?S60_version |
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* @param aPrimaryPageSize The page size in primary dimension. |
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* @param aPrimaryLooping Enable or disable looping. |
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*/ |
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virtual void setNavigationParams( int aPrimaryPageSize, |
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bool aPrimaryLooping ) = 0; |
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|
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/** |
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* Set the navigation parameters for two-dimensional navigation. |
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* The parameters determine the behavior of all navigation events. |
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* Navigation and scrolling are supported in both dimensions. |
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* If the secondary page size is equal to the size of the whole |
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* navigation space, the scrolling in secondary dimension is disabled. |
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* |
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* @since S60 ?S60_version |
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* @param aPrimaryPageSize The page size in primary dimension. |
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* @param aPrimaryLooping Enable or disable looping. |
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*/ |
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virtual void setNavigationParams( int aPrimaryPageSize, |
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int aSecondarySize, |
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int aSecondaryPageSize, |
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bool aPrimaryLooping, |
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bool aSecondaryLooping ) = 0; |
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|
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/** |
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* Getter for scrolling distance in primary dimension. |
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* The scrolling distance is the minimum number of items before |
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* the first or the last visible item. For example, the scrolling |
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* distance of one defines that the focus should never get to the |
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* first or the last visible item, except in the beginning or the |
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* end of the list. |
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* |
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* @since S60 ?S60_version |
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* @return The scrolling distance in primary dimension. |
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*/ |
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virtual int primaryScrollingDist() const = 0; |
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|
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/** |
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* Getter for scrolling distance in secondary dimension. |
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* |
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* @since S60 ?S60_version |
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* @return The scrolling distance in secondary dimension. |
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*/ |
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virtual int secondaryScrollingDist() const = 0; |
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|
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/** |
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* Set the scrolling distances for the list control. |
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* The scrolling distances are used to determine when |
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* to start scrolling. The scrolling distance of zero |
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* indicates that the scrolling should start if the focus |
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* is moved outside of the visible items. Similarly, |
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* the scrolling distance of one indicates that the |
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* scrolling should start when the first or the last |
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* visible item is focused. |
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* |
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* @param aPrimaryScrollingDist The minimum number of items before the first |
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* or the last visible item in primary dimension. |
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* @param aSecondaryScrollingDist The minimum number of items before the first |
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* or the last visible item in secondary dimension. |
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* @since S60 ?S60_version |
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*/ |
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virtual void setScrollingParams( int aPrimaryScrollingDist, |
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int aSecondaryScrollingDist ) = 0; |
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/** |
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* Determine if the primary dimension on the screen is vertical. |
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* This is used to convert directional navigation events to the |
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* logical navigation events. |
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* |
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* @since S60 ?S60_version |
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* @return <code>true</code> if the primary dimension is vertical, |
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* <code>false</code> if the primary dimension is horizontal. |
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*/ |
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virtual bool verticalPrimary() const = 0; |
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/** |
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* Determine if the indices in the navigation space |
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* increase from left to right. This is used to determine |
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* the direction of the horizontal navigation events. |
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* |
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* @since S60 ?S60_version |
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* @return <code>true</code> if the indices increase from left to right, |
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* <code>false</code> if the indices increase from right to left. |
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*/ |
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virtual bool leftToRight() const = 0; |
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|
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/** |
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* Determine if the indices in the navigation space |
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* increase from up to down. This is used to determine |
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* the direction of the vertical navigation events. |
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* |
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* @since S60 ?S60_version |
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* @return <code>true</code> if the indices increase from up to down, |
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* <code>false</code> if the indices increase from down to up. |
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*/ |
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virtual bool upToDown() const = 0; |
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/** |
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* Set the orientation parameters. |
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* The orientation parameters are used to convert directional |
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* navigation events to logical navigation events. |
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* |
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* @since S60 ?S60_version |
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* @param aVerticalPrimary Specify the orientation of the primary dimension. |
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* @param aLeftToRight Specify the increasing order of horizontal indices. |
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* @param aUpToDown Specify the increasing order of vertical indices. |
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*/ |
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virtual void setOrientationParams( bool aVerticalPrimary, |
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bool aLeftToRight, bool aUpToDown ) = 0; |
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|
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/** |
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* Determine if the default key events are used for navigation. |
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* |
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* @since S60 ?S60_version |
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* @return <code>true</code> if the default key events are used, |
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* <code>false</code> otherwise. |
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*/ |
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virtual bool defaultKeysEnabled() const = 0; |
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/** |
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* Enable or disable the default key events. |
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* |
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* @since S60 ?S60_version |
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* @param aEnable The usage of the default key events. |
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*/ |
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virtual void enableDefaultKeys( bool aEnable ) = 0; |
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}; |
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} // namespace Alf |
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#endif // I_ALFNAVIGATION_H |
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// End of File |