author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Wed, 13 Oct 2010 15:34:15 +0300 | |
branch | RCL_3 |
changeset 63 | e1987ab3768a |
parent 0 | 15bf7259bb7c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2006 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: Layout base class |
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* |
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*/ |
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#ifndef C_ALFLAYOUT_H |
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#define C_ALFLAYOUT_H |
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#include <alf/alfvisual.h> |
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#include <alf/alftimedvalue.h> |
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#include <alf/alfmetric.h> |
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/** Layout types. */ |
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enum TAlfLayoutType |
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{ |
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EAlfLayoutTypeLayout, |
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EAlfLayoutTypeFlow, |
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EAlfLayoutTypeGrid, |
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EAlfLayoutTypeLCTGrid, |
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EAlfLayoutTypeApp, |
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EAlfLayoutTypeAnchor, |
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EAlfLayoutTypeLCTAnchor, |
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EAlfLayoutTypeDeck, |
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EAlfLayoutTypeViewport, |
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EAlfLayoutTypeCurvePath |
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}; |
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|
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/** The default transition time is queried from CAlfStatic. */ |
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const TInt KAlfLayoutDefaultTransitionTime = -1; |
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|
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class CAlfControl; |
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|
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/** |
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* Base class for all layouts. |
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* |
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* @lib alfclient.lib |
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* @since S60 v3.2 |
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* |
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* Layouts are visuals that manage the placement of a set of child visuals |
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* (or other layouts). |
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* |
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* Layouts are responsible for setting the positions and sizes of their |
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* child visuals. Each layout can define a position, a size, or both |
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* (or neither) for their children. |
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* |
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* Layouts use the children's ordinal numbers to determine where each of |
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* them should be placed. For example, a grid layout could define that the |
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* top row contains children with ordinals 0..3, from left to right. The |
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* second row could then contain the children 4..7. When the order of the |
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* child visuals changes within their parent layout, the parent layout |
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* will recalculate the positions and sizes of the affected children. |
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* |
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* When the size of a layout changes, it will immediately recalculate the |
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* layout of its children. The transition time that is specified in the |
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* size transition of the layout is used when setting the targets of the |
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* children's new positions and sizes. |
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* |
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* Layouts are able to notify their controls when their size is changed. |
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* These notifications are needed because the size of a layout is not known |
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* until the display is refreshed. This means that the <strong>size of a layout |
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* is not available when your controls ConstructL is executed</strong>, unless |
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* it is explicitly set. The notifications are also handy because they allow |
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* the controls to respond to dynamic screen size changes. So unless if the |
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* whole screen is not used for the layout, the notifications are the only way |
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* to do calculations based on the layout size. |
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* |
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* To make the control receive layout update notifications call: |
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* |
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* <code> |
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* layout->SetFlags(EAlfVisualFlagLayoutUpdateNotification); |
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* </code> |
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* |
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* .. and override VisualLayoutUpdated() method in your control. |
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* |
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* @see SetSize() |
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* @see SetFlags() |
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* @see CAlfControl::VisualLayoutUpdated() |
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* |
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* Each layout defines its own local coordinate system used for interpreting |
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* the positions and sizes of its child visuals. The base unit of the |
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* coordinate system is defined with the SetBaseUnit() method, which sets a |
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* TAlfXYMetric to use as the basis for all coordinate calculations. The default |
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* metric is [1px, 1px] which corresponds to pixels on the display. |
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* |
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* The local coordinate system of a layout can be mirrored horizontally and/or |
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* vertically by using a negative magnitude in the relevant TAlfMetric of the |
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* base unit. Note that this will only affect the local coordinate system |
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* of the layout: the contents of the child visuals or child layouts will not |
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* be mirrored. Visual mirroring should be done with a CAlfTransformation, |
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* and child layouts can be mirrored by further application of the negative |
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* base unit metrics. In order to enable a layout to automatically mirror the |
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* horizontal component of the base unit based on locale mirroring, set the visual flag |
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* @c EAlfVisualFlagAutomaticLocaleMirroringEnabled, note that it is necessary |
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* to set this flag for each layout for which this feature is required. |
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* |
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* To create to a fully scalable UI, the appropriate base unit metrics and |
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* layout visuals must be used. For example, the EAlfUnitS60 metric unit is |
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* dependent on the platform-specified measurement units for layout. |
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* CAlfGridLayout and CAlfAnchorLayout provide support for pixel-independent |
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* placement of their children. |
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* |
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* @see CAlfAnchorLayout |
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* @see CAlfGridLayout |
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* |
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* Applications that need more complex layouts should derive their own |
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* CAlfLayout based classes that implement the necessary layout calculations. |
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* In many cases, however, a combination of some of the built-in layout classes |
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* such as anchor and grid layouts will be sufficient. |
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*/ |
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class CAlfLayout : public CAlfVisual |
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{ |
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126 |
|
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public: |
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128 |
|
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enum TExpansionFlags |
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{ |
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/** Not expanding in any direction. */ |
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EExpandNone = 0, |
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133 |
|
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/** Expands horizontally. */ |
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EExpandHorizontally = 1, |
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136 |
|
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/** Expands vertically. */ |
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EExpandVertically = 2 |
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}; |
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140 |
|
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141 |
|
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/** |
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* 2-phased constructor which also gives ownedship to control. |
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* |
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* @param aOwnerControl Control which owns new layout |
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* @param aParentLayout If given, has the parent layout. |
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* @return New object. Ownership NOT returned. Instead given to control. |
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*/ |
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IMPORT_C static CAlfLayout* AddNewL( CAlfControl& aOwner, |
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CAlfLayout* aParentLayout = 0 ); |
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151 |
|
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/** |
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* Constructor. |
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*/ |
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IMPORT_C CAlfLayout(); |
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156 |
|
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/** |
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* From CAlfVisual. Second-phase constructor. |
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*/ |
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IMPORT_C void ConstructL( CAlfControl& aOwner ); |
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|
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/** |
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* Virtual destructor. |
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*/ |
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IMPORT_C ~CAlfLayout(); |
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166 |
|
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/** |
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* From CAlfVisual. Removes this layout from its owner and and destroys the layout. |
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* Also removes the entire hierarchy of child visuals and destroys all |
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* of them. |
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*/ |
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IMPORT_C void RemoveAndDestroyAllD(); |
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|
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/** |
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* Append a new visual to the layout. |
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* |
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* @param aVisual Visual to append. |
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* @param aConstructedWithParentInformation Whether visual already knows its parent |
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* @return Error code. |
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* |
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* @todo Add a method for appending multiple visuals in one set, so that |
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* they only cause a single layout update. |
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*/ |
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IMPORT_C TInt Append( CAlfVisual* aVisual, TBool aConstructedWithParentInformation = EFalse, TInt aLayoutTransitionTime = 0 ); |
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|
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/** |
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* Remove a visual from the layout. |
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* |
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* @param aVisual Visual to remove. |
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* @param aLayoutTransitionTime How long the transition should take visually, in milliseconds. |
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* |
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* @todo Add a method for removing multiple visuals in one set, so that |
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* they only cause a single layout update. |
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*/ |
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IMPORT_C void Remove( CAlfVisual* aVisual, TInt aLayoutTransitionTime = 0 ); |
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|
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/** |
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* Moves the given child visual to specific position in the layout's list |
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* of child visuals. Affects the drawing order (last child is drawn last), |
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* and possibly the final laid out position and size of the visual. |
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* This is due to that many layout implementations calculate the |
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* positioning of their children based on child's order number |
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* in the list. |
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* |
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* Causes layout recalculation. |
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* |
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* @param aVisual Child visual to move. |
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* @param aPosition New position (and ordinal number) |
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* in the child list (0 = first, Count()-1 = last). |
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* @see MoveVisualToBack() |
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* @see MoveVisualToFront() |
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*/ |
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IMPORT_C void Reorder(CAlfVisual& aVisual, TInt aPosition, TInt aLayoutTransitionTime = 0 ); |
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/** |
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* Moves a child visual to the front of the other children. In other words |
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* the visual is drawn last (on top of the other child visuals). In practise |
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* this affects the order of the visuals whithin this layout so that the |
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* visual is moved at the end of the list. |
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* |
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* Causes layout recalculation. |
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* |
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* @param aVisual Child visual to move. |
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* @param aLayoutTransitionTime How long the transition should take visually, in milliseconds. |
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* @see MoveVisualToBack() |
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* @see Reorder() |
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* |
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* @see MoveVisualToFront() - Use this instead! |
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*/ |
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IMPORT_C void MoveVisualToFront(CAlfVisual& aVisual, TInt aLayoutTransitionTime = 0 ); |
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|
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/** |
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* Moves a child visual behind the other children (in drawing order). |
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* In other words the visual is drawn first (the other child visuals will |
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* be drawn on top of this visual). |
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* |
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* In practise this affects the order |
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* of the visuals whithin this layout so that the visual is moved at |
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* the beginning of the list (ordinal 0). |
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* |
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* @param aVisual Child visual to move. |
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* @param aLayoutTransitionTime How long the transition should take visually, in milliseconds. |
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* @see MoveVisualToFront() |
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* @see Reorder() |
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*/ |
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IMPORT_C void MoveVisualToBack(CAlfVisual& aVisual, TInt aLayoutTransitionTime = 0 ); |
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|
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|
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/** |
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* Returns the number of child visuals in the layout. |
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* |
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* @return Child visual count. |
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*/ |
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IMPORT_C TInt Count() const; |
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|
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/** |
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* Returns a child visual. |
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* |
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* @param aIndex Index of the child visual. |
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* |
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* @return Reference to a child visual. |
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*/ |
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IMPORT_C CAlfVisual& Visual( TInt aIndex ) const; |
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|
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/** |
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* Enables or disables scrolling in the layout. |
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* |
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* @param aScrolling ETrue to enable scrolling, |
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* EFalse to disable. |
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*/ |
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IMPORT_C void EnableScrollingL(TBool aScrolling = ETrue); |
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|
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/** |
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* Is scrolling in the layout. |
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* |
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* @return ETrue if scrolling is enabled. |
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*/ |
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IMPORT_C TBool Scrolling() const; |
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|
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/** |
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* Returns the scroll offset of the layout. The scroll offset is in |
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* layout's base units. |
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* |
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* @return Reference to timed point that defines the scroll offset. |
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*/ |
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IMPORT_C const TAlfTimedPoint& ScrollOffset() const; |
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|
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/** |
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* Set the scroll offset |
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* |
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* @param aPoint Sets the point. |
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*/ |
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IMPORT_C void SetScrollOffset(const TAlfTimedPoint& aPoint); |
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/** |
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* Determines the layout ordinal for a child visual. The child's placement |
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* depends on the ordinal number. |
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* |
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* @param aIndex Index of the child visual. |
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*/ |
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IMPORT_C TInt ChildOrdinal(TInt aIndex); |
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|
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/** |
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* Determines the position of a child visual according to the layout. |
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* |
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* @param aOrdinal Layout ordinal of the child visual. |
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* @param aPos New position for the child. |
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* |
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* @return <code>ETrue</code>, if a new position was determined. |
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* Otherwise, <code>EFalse</code> is returned and no position |
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* changes are needed. |
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*/ |
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IMPORT_C TBool ChildPos(TInt aOrdinal, TPoint& aPos); |
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|
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/** |
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* Determines the size of a child visual according to the layout. |
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* |
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* @param aOrdinal Layout ordinal of the child visual. |
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* @param aSize New target size for the child. |
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* |
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* @return <code>ETrue</code>, if a new size was determined. Otherwise, |
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* <code>EFalse</code> is returned and no size changes are |
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* needed. |
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*/ |
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IMPORT_C TBool ChildSize(TInt aOrdinal, TSize& aSize); |
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|
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/** |
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* @from CAlfVisual |
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* Update the layout of all children. Subclasses can call this to |
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* recalculate the layout of all children. |
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* |
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* @param aTransitionTime Time for layout transition in milliseconds. |
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* Any negative value uses value given in |
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* CAlfEnv::StaticSetLayoutTransitionTime() |
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*/ |
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IMPORT_C void UpdateChildrenLayout(TInt aTransitionTime = 0); |
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|
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/** |
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* @from CAlfVisual |
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* Finds a visual whose tag descriptor contains a specific tag. |
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* |
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* CAlfLayout::FindTag() extends the search into child visuals, |
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* covering recursively entire visual hierarchies. |
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* |
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* @param aTag Tag to look for. If this tag is found as a part of a |
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* visual's colon-separated tag descriptor, it is treated |
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* as a match and the visual is returned. The tag to look |
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* for cannot contain separator characters (:). |
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* |
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* @return Visual whose tag descriptor matches the tag. <code>NULL</code>, |
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* if no such visual could be found. |
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* |
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* Todo: how should several visuals with matching tag to be handled ?? |
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* |
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* @see CAlfVisual::Tag() |
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* @see CAlfVisual::SetTagL() |
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* @see CAlfVisual::IsTagged() |
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* @see CAlfVisual::FindTag() |
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*/ |
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IMPORT_C CAlfVisual* FindTag(const TDesC8& aTag); |
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|
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/** |
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* Sets the transition time for the recalculation of this layout's |
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* contents. This is used when a visual is added or removed or when |
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* the order of the children is changed. |
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* |
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* Set to KAlfLayoutDefaultTransitionTime to make the layout use the |
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* default transition time queried from CAlfStatic. |
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* |
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* @param aTransitionTime Transition time in milliseconds, or |
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* KAlfLayoutDefaultTransitionTime. |
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*/ |
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IMPORT_C void SetTransitionTime(TInt aTransitionTime); |
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|
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/** |
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* Returns the transition time of this layout. |
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* |
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* @return Transition time in milliseconds, or |
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* KAlfLayoutDefaultTransitionTime. |
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* |
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* @see CAlfLayout::SetTransitionTime() |
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*/ |
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IMPORT_C TInt TransitionTime() const; |
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386 |
|
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/** |
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* Determines the virtual size of the layout. The virtual size may be |
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* larger than the actual size. The virtual size is updated automatically |
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* when the layout's children are positioned. |
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* |
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* @return Virtual size. |
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*/ |
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IMPORT_C TSize VirtualSize() const; |
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|
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/** |
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* Sets the inner padding of the layout. This is typically the amount |
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* of empty space between child visuals in the layout. |
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* |
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* @note that the left and right paddings will be the same, and the top and bottom |
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* paddings will be the same. |
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* @deprecated migrate to using metrics instead |
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* @param aInnerPadding Inner padding (e.g., column, row separation). |
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*/ |
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IMPORT_C void SetInnerPadding(const TPoint& aInnerPadding); |
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|
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/** |
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* Sets the inner padding of the layout. This is typically the amount |
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* of empty space between child visuals in the layout. |
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* |
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* @note as paddings are relative to the layout visual, if relative units are required, |
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* it is advisable to use EAlfUnitRelativeToMySize so that the paddings are relative |
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* to the size of this layout visual |
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* |
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* @param aInnerPadding Inner padding, using metrics. |
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*/ |
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IMPORT_C void SetInnerPadding(const TAlfXYMetric& aInnerPadding); |
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|
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419 |
/** |
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420 |
* Returns the inner padding. |
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Revision: 201003
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|
421 |
* @deprecated this will return correct pixel values only if paddings were set |
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|
422 |
* using deprecated pixel based APIs, so migrate to using metrics instead |
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|
423 |
*/ |
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|
424 |
IMPORT_C TPoint InnerPadding() const; |
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425 |
|
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|
426 |
/** |
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|
427 |
* Returns the inner padding metric |
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Revision: 201003
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|
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* @see InnerPadding() which is superceded by this method |
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429 |
*/ |
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|
430 |
IMPORT_C const TAlfXYMetric& InnerPaddingAsMetric() const; |
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|
431 |
|
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432 |
/** |
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|
433 |
* Returns the inner horizontal padding. |
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|
434 |
* |
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|
435 |
* @deprecated this will return correct pixel values only if paddings were set |
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|
436 |
* using deprecated pixel based APIs, so migrate to using metrics instead |
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437 |
*/ |
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438 |
IMPORT_C TInt HorizontalInnerPadding() const; |
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439 |
|
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440 |
/** |
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441 |
* Returns the inner vertical padding. |
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442 |
* |
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443 |
* @deprecated this will return correct pixel values only if paddings were set |
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444 |
* using deprecated pixel based APIs, so migrate to using metrics instead |
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445 |
*/ |
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446 |
IMPORT_C TInt VerticalInnerPadding() const; |
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447 |
|
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448 |
/** |
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449 |
* Returns the inner padding converted to the base units of this layout. |
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450 |
* These can be summed with the positions and sizes of the layout's children. |
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451 |
*/ |
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452 |
IMPORT_C TAlfRealPoint InnerPaddingInBaseUnits() const; |
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|
453 |
|
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454 |
/** |
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|
455 |
* Finds a visual's index. |
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|
456 |
* |
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457 |
* @param aVisual Visual to look for. |
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458 |
* |
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|
459 |
* @return Index of the visual, or <code>KErrNotFound</code>. |
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460 |
*/ |
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|
461 |
IMPORT_C TInt FindVisual(CAlfVisual* aVisual) const; |
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|
462 |
|
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|
463 |
/** |
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|
464 |
* Insert a new visual to the layout, at specified position (position 0 is the first, |
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|
465 |
* Count() -1 is the last). If the visual is already a member of |
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|
466 |
* some other layout, it will be removed from the old layout first. |
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|
467 |
* |
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|
468 |
* @param aVisual Visual to append. |
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|
469 |
* @param TInt Position to insert. This is the new ordinal number of the visual. |
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Revision: 201003
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470 |
* @return Error code |
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471 |
*/ |
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|
472 |
IMPORT_C TInt Insert(CAlfVisual* aVisual, TInt aPosition); |
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473 |
|
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474 |
/** |
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|
475 |
* Layout is calculated according the ordinals. The effective ordinal |
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476 |
* may not be the same as the real child ordinal, because some visuals |
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|
477 |
* are laid out manually. |
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478 |
* |
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|
479 |
* @return Effective ordinal for the child visual. |
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480 |
*/ |
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|
481 |
IMPORT_C TInt EffectiveLayoutOrdinal(const CAlfVisual& aVisual) const; |
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|
482 |
|
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|
483 |
/** |
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|
484 |
* Defines the base unit used for positioning and sizing children |
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|
485 |
* within this layout. For example, the actual X position of a child is |
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Revision: 201003
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|
486 |
* determined by <tt>aBaseUnit.iX * childX</tt>. The effect of the |
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Revision: 201003
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parents:
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|
487 |
* base unit is limited to the children of this layout -- the |
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Revision: 201003
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parents:
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|
488 |
* grandchildren use the base units of their parents, not this base unit. |
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Revision: 201003
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|
489 |
* |
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|
490 |
* @note It is recommended to use EAlfUnitNormalized if proportional base units are |
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Revision: 201003
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|
491 |
* required. For example, EAlfUnitRelativeToMySize would not make sense as a base |
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Revision: 201003
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|
492 |
* unit. |
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|
493 |
* |
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Revision: 201003
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parents:
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|
494 |
* @param aMetric Metric that will be used for both X and Y axes. |
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Revision: 201003
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|
495 |
*/ |
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|
496 |
IMPORT_C void SetBaseUnit(const TAlfMetric& aBaseUnit); |
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|
497 |
|
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|
498 |
/** |
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parents:
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|
499 |
* Defines the base unit used for positioning and sizing children |
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Revision: 201003
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parents:
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|
500 |
* within this layout. For example, the actual X position of a child is |
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Revision: 201003
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parents:
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|
501 |
* determined by <tt>aBaseUnit.iX * childX</tt>. The effect of the |
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Revision: 201003
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parents:
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|
502 |
* base unit is limited to the children of this layout -- the |
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Revision: 201003
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parents:
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|
503 |
* grandchildren use the base units of their parents, not this base unit. |
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Revision: 201003
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|
504 |
* |
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Revision: 201003
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parents:
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|
505 |
* @param aMetric Metric to use as the base unit. |
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|
506 |
*/ |
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Revision: 201003
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|
507 |
IMPORT_C void SetBaseUnit(const TAlfXYMetric& aBaseUnit); |
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|
508 |
|
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parents:
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|
509 |
/** |
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Revision: 201003
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|
510 |
* Returns the layout's base measurement unit. The positions and sizes |
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Revision: 201003
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|
511 |
* of the children of this layout are interpreted as multiples of this |
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Revision: 201003
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|
512 |
* base unit. For example, the actual X position of a child is |
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Revision: 201003
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|
513 |
* determined by <tt>aBaseUnit.iX * childX</tt>. |
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Revision: 201003
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|
514 |
* |
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Revision: 201003
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|
515 |
* The effect of the base unit is limited to the children of this layout |
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Revision: 201003
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parents:
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|
516 |
* -- the grandchildren use the base units of their parents, not this |
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Revision: 201003
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|
517 |
* base unit. |
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Revision: 201003
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|
518 |
* |
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Revision: 201003
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|
519 |
* @note that if the visual flag @c EAlfVisualFlagAutomaticLocaleMirroringEnabled |
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Revision: 201003
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|
520 |
* is set, the value returned by this method will change based on the current platform |
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Revision: 201003
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parents:
diff
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|
521 |
* locale mirroring in the X-axis. So for example if the current layout is mirrored, then |
15bf7259bb7c
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
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522 |
* the value returned by this method will have the X magnitude set to the negative |
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* of the value that was set using @c SetBaseUnit. |
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* |
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* @return Metric used as the base unit for child coordinates and sizes. |
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*/ |
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IMPORT_C virtual TAlfXYMetric BaseUnit() const; |
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|
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protected: |
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|
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/** |
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* @from CAlfVisual |
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* Deletes the child visuals |
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*/ |
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IMPORT_C void DoRemoveAndDestroyAllD(); |
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IMPORT_C void PropertyOwnerExtension(const TUid& aExtensionUid, TAny** aExtensionParams); |
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|
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private: |
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|
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// Private structure. Owned. |
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struct TLayoutPrivateData; |
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TLayoutPrivateData* iLayoutData; |
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|
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}; |
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|
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|
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#endif // C_ALFLAYOUT_H |