author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 17 Dec 2009 08:56:02 +0200 | |
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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: Model interface with utilities for scrollbar widget. |
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* |
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*/ |
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#ifndef IALF_SCROLLBARMODEL_H |
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#define IALF_SCROLLBARMODEL_H |
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//WidgetModel Includes |
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#include <alf/ialfmodel.h> |
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using namespace osncore; |
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namespace Alf |
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{ |
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|
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namespace alfscrollbarmodel |
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{ |
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static const IfId ident = |
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{ |
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0, "alfscrollbarmodel" |
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}; |
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} |
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|
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/** |
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* An interface of the scrollbar model. |
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*/ |
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class IAlfScrollBarModel : public IAlfModel |
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{ |
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|
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public: |
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|
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/** |
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* Getter for the type identifier of this interface. |
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* |
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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 alfscrollbarmodel::ident; |
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} |
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|
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/** |
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* Function for initializing the model. |
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* |
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* The unit of paremeters aTotalLength, aViewLength, aViewStartPosition |
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* depends on the user of scrollbar. For example editor may |
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* decide to support scrolling by line,means in case of editor |
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* aTotalLenght can be total number of lines in the document, |
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* aViewlength can be the number of lines which fit inside a page/view, |
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* aViewstartPosition can be the line number from which view starts and |
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* |
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* (currently no visualization is there for focus position inside scrollbar) |
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* |
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* @param aTotalLength - Total length of the content or document if it |
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* were laid out. Minimum Value of total length can be |
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* 1. If a value less than 1 is passed it is converted |
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* to 1 automatically. |
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* |
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* @param aViewLength - Amount of TotalLength which is viewable. Minmum |
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* value of viewlength is 1 and maximum value is equal |
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* to total length. If a value less than 1 is passed |
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* it is converted to 1 similarly, if a value greater |
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* than aTotalLength is passed it is converted to |
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* aTotalLength. |
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* @param aViewStartPosition - view start position. This can be between 0 |
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* and (aTotalLength - aViewLength). As in |
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* case of total length and view length, if a |
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* value out side range is passed it is convered |
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* to the nearest boundary value (0 or |
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* aTotalLength - aViewLength). |
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* @return void. |
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*/ |
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virtual void initializeData( |
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int aTotalLength, |
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int aViewLength, |
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int aViewStartPosition) = 0; |
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|
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/** |
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* Sets the Total Length for the Scrollbar |
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* which is the length of the document or viewable data. |
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* |
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* Arbitrary units are used, but the same units as the rest of the model. |
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* This length is best current estimate of the length of the entire |
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* viewable data in this model's direction.(i.e, vertical, horizontal). |
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* It represents physical extent (e.g. could be pixels), not logical size |
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* of the data. |
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* It is understood to represent the physical laid out size of the data |
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* if it were possible to view it all at once. |
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* |
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* @param aTotalLength - Total length of the content or document. Minimum |
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* Value of total length can be 1. If a value less |
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* than 1 is passed, it is converted to 1 |
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* automatically. |
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* If the value passed is less than the current view |
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* length, current view length is also changed to the |
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* passed total length so that view length is still |
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* valid. Similarly if required, view start position |
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* is also changed so that it is still valid. |
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* See the documentation of initializeData() to know |
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* valid values of each model data. If change of more |
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* than one model data is required, use changeData() |
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* function. |
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* |
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* @return void. |
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*/ |
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virtual void setTotalLength(int aTotalLength) = 0; |
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|
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/** |
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* Sets the View Length for the Scrollbar |
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* For horizontal models, this is the width of the view. |
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* For veritcal, this is the height of the view. |
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* |
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* Note the units are arbitrary but uniform with the rest of the model. |
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* Note that this measure is proportional to the physical width or height |
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* of the view.This metric is sometimes called the Thumb size. |
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* @param aViewLegth - Amount of Total Length which is viewable. Minmum |
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* value of viewlength is 1 and maximum value is equal |
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* to total length. If a value out of range is passed |
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* it is converted to the nearest boundary (1 or total |
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* length). |
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* See the documentation of initializeData() to know |
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* valid values of each model data. If change of more |
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* than one model data is required, use changeData() |
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* function. |
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* @return void. |
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*/ |
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virtual void setViewLength(int aViewLength) = 0; |
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|
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/** |
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* Sets the View Start Position for the Scrollbar |
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* Position in arbitrary units of the start of the currently viewed data. |
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* For horizontal models, this is the position of the left of the view |
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* relative to the far left end of the document. |
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* For veritcal, this is the position of the top of the view from the |
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* top of the viewable data. |
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* |
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* Note the units are arbitrary but uniform with the rest of the model. |
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* Position is in physical space as if the entire data were laid out. |
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* This metric is sometimes called the Thumb position. |
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* |
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* @param aViewStartPosition - start position of the viewable area. This can |
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* be between 0 and (aTotalLength - aViewLength |
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* ). If a value out side range is passed, it |
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* is convered to the nearest boundary value (0 |
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* or totalLength - viewLength) |
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* See the documentation of initializeData() to |
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* know valid values of each model data. If |
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* change of more than one model data is |
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* required, use changeData() function. |
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* |
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* @return void. |
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*/ |
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virtual void setViewStartPosition(int aViewStartPosition) = 0; |
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|
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/** |
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* Sets TotalLength, View length and ViewStartPosition for the Scrollbar. |
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* |
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* See the documentation of initializeData() to know valid values of each |
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* model data. If the value passed are not valid, they are changed to the |
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* closest valid value. |
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* |
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* @param aTotalLength - total length |
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* @param aViewLength - view Length |
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* @param aViewStartPosition - View Start Position |
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* @return void. |
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*/ |
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virtual void changeData( |
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int aTotalLength, |
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int aViewLength, |
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int aViewStartPosition) = 0; |
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|
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/** |
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* Length of the document or viewable data. |
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* (refer setter function for detailed concept). |
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* @return length in arbitrary units of the viewable data |
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*/ |
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virtual int getTotalLength() const = 0; |
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|
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/** |
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* Length of the view (refer setter function for detailed concept). |
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* |
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* @return view length |
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*/ |
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virtual int getViewLength() const = 0; |
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|
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/** |
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* Position in arbitrary units of the start of the currently viewed data |
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* (refer setter function for detailed concept). |
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* @return position of the start of the view |
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*/ |
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virtual int getViewStartPosition() const = 0; |
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|
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}; |
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|
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} // namespace Alf |
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|
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#endif // IALF_SCROLLBARMODEL_H |
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