author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 19 Apr 2010 14:01:53 +0300 | |
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/* |
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* Copyright (c) 2007-2008 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: Controlet to implement marquee functionality for visuals |
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* |
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*/ |
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#ifndef T_TIRMARQUEECLET_H |
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#define T_TIRMARQUEECLET_H |
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#include <alf/alfeventhandler.h> |
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class CAlfControl; |
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class CAlfViewportLayout; |
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class CAlfTextVisual; |
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/** |
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* Small controlet to implement marquee effects to visuals. |
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* |
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* Responsible for managing the supplied viewport layout to achieve a marquee effect. |
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* Provides events to the control about scroll status changes. |
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*/ |
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class TIRMarqueeClet : public MAlfEventHandler |
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{ |
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public: |
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/** |
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* Supported scroll styles. |
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*/ |
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enum TIRScrollStyle |
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{ |
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/** |
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* Scroll is performed only once. |
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* When scrolling is completed, the viewport is set to its original position. |
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* This is the default scroll style if no other is explicitly set. |
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*/ |
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EIRScrollStyleOnce, |
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/** |
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* Scroll is continuous scroll. |
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*/ |
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EIRScrollStyleLoop |
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}; |
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/** |
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* Supported scroll directions. |
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*/ |
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enum TIRScrollDirection |
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{ |
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/** |
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* Scrolling is performed to left (western). |
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* This is the default scroll direction if no other is explicitly set. |
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*/ |
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EIRScrollDirectionLeft, |
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/** |
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* Scrolling is performed to right (arabic). |
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*/ |
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EIRScrollDirectionRight |
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}; |
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public: |
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/** |
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* Constructor. |
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*/ |
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TIRMarqueeClet(); |
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/** |
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* Destructor. |
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*/ |
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~TIRMarqueeClet(); |
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/** |
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* Sets the required information for this marquee controlet. |
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* |
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* @param aViewport Viewport layout to use. |
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* @param aTextVisual Text visual to use. |
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*/ |
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void Set( CAlfViewportLayout& aViewport, CAlfTextVisual& aTextVisual ); |
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/** |
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* Sets scroll speed in pixels per second. |
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* |
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* The actual scroll time is calculated dynamically by the controlet to achieve |
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* smooth motion. |
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* |
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* @param aScrollSpeed Pixels per second to scroll. |
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*/ |
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void SetScrollSpeed( TInt aScrollSpeed ); |
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/** |
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* Sets the scroll direction. |
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* |
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* @param aScrollDirection Scroll direction to use. |
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*/ |
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void SetScrollDirection( TIRScrollDirection aScrollDirection ); |
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/** |
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* Sets the scroll style. |
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* |
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* @param aScrollStyle Scroll style to use. |
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*/ |
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void SetScrollStyle( TIRScrollStyle aScrollStyle ); |
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/** |
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* Starts scrolling. |
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* |
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* Notifications of scroll start and stop events are sent to the registered control. |
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* |
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* @param aDelay Delay in milliseconds after which the scroll is started. |
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* @param aSnooze Snooze period in milliseconds after scroll is completed. |
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* The use of the snooze period is dependant on the scroll style. |
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* When the scroll style is <code>EVRScrollStyleOnce</code>, the snooze |
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* period indicates the amount of time after scrolling is completed before |
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* the control is notified of the scroll complete event. |
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*/ |
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void StartL( TInt aDelay = 0, TInt aSnooze = 0 ); |
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|
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// from base class MAlfEventHandler |
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TBool OfferEventL( const TAlfEvent& aEvent ); |
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private: |
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|
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/** |
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* Supported scroll notification events. |
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* Notification about these events are sent to the registered control when they occur. |
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* Pointer to the viewport layout for which the event completed is passed as custom event data. |
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*/ |
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enum TIRScrollEvent |
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{ |
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/** |
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* Notification that is sent when the scroll starts. |
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* This is sent after the delay period, if any, expires. |
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*/ |
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EIRCustomEventScrollStarted = 0x00002000, |
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/** |
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* Notification that is sent when the scroll has completed. |
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* This is sent after scrolling is completed and after the snooze |
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* period has passed. |
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*/ |
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EIRCustomEventScrollCompleted |
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}; |
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|
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/** |
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* Viewport layout to manage. |
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* Not owned. |
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*/ |
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CAlfViewportLayout* iViewport; |
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|
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/** |
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* Text visual. |
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* Not owned. |
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*/ |
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CAlfTextVisual* iTextVisual; |
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|
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/** |
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* Text visual scroll size. |
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*/ |
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TSize iScrollSize; |
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|
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/** |
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* Scroll speed in pixels per second. |
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*/ |
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TInt iScrollSpeed; |
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|
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/** |
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* Scroll direction to use. |
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*/ |
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TIRScrollDirection iScrollDirection; |
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|
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/** |
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* Scroll style to use. |
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*/ |
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TIRScrollStyle iScrollStyle; |
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|
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/** |
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* The snooze period. |
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*/ |
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TInt iSnoozeTime; |
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|
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/** |
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* Point of origin for the viewport. |
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*/ |
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TAlfRealPoint iOrigin; |
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|
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/** |
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* The width of the original text. |
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*/ |
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TInt iOriginalTextWidth; |
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|
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}; |
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#endif // T_TVRMARQUEECLET_H |