author | Pat Downey <patd@symbian.org> |
Tue, 18 May 2010 11:36:57 +0100 | |
changeset 4 | 3f2d53f144fe |
parent 0 | 09774dfdd46b |
permissions | -rw-r--r-- |
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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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|
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|
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#include <alf/alfcontrol.h> |
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#include <alf/alfenv.h> |
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#include <alf/alfevent.h> |
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#include <alf/alfviewportlayout.h> |
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#include <alf/alftimedvalue.h> |
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#include <alf/alftextvisual.h> |
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#include "irmarqueeclet.h" |
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|
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// Default scroll style. |
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const TIRMarqueeClet::TIRScrollStyle KVRDefaultScrollStyle = TIRMarqueeClet::EIRScrollStyleOnce; |
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// Default scroll direction. |
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const TIRMarqueeClet::TIRScrollDirection KVRDefaultScrollDirection = |
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TIRMarqueeClet::EIRScrollDirectionLeft; |
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// Default scroll speed in pixels per second. |
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const TInt KVRDefaultScrollSpeed = 30; |
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//Default Scroll Time |
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const TInt KVRScrollTime=1000; |
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// Spaces needed when creating continuously scrolling text. |
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_LIT( KVRSpace, " " ); |
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|
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// --------------------------------------------------------------------------- |
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// Constructor. |
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// --------------------------------------------------------------------------- |
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// |
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TIRMarqueeClet::TIRMarqueeClet() : |
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iViewport( NULL ), iTextVisual( NULL ), iScrollSize(), |
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iScrollSpeed( KVRDefaultScrollSpeed ), iScrollDirection( KVRDefaultScrollDirection ), |
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iScrollStyle( KVRDefaultScrollStyle ), iSnoozeTime( 0 ), iOrigin(), iOriginalTextWidth( 0 ) |
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{ |
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} |
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// --------------------------------------------------------------------------- |
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// Destructor. |
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// --------------------------------------------------------------------------- |
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// |
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TIRMarqueeClet::~TIRMarqueeClet() |
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{ |
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if ( iTextVisual ) |
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{ |
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iTextVisual->Owner().Env().CancelCustomCommands( this ); |
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} |
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} |
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// --------------------------------------------------------------------------- |
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// Sets the required information for this marquee controlet. |
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// --------------------------------------------------------------------------- |
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// |
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void TIRMarqueeClet::Set( CAlfViewportLayout& aViewport, CAlfTextVisual& aTextVisual ) |
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{ |
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aTextVisual.Owner().Env().CancelCustomCommands( this ); |
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iViewport = &aViewport; |
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iTextVisual = &aTextVisual; |
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} |
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// --------------------------------------------------------------------------- |
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// Sets scroll speed in pixels per second. |
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// --------------------------------------------------------------------------- |
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// |
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void TIRMarqueeClet::SetScrollSpeed( TInt aScrollSpeed ) |
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{ |
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iScrollSpeed = aScrollSpeed; |
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} |
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// --------------------------------------------------------------------------- |
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// Sets the scroll direction. |
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// --------------------------------------------------------------------------- |
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// |
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void TIRMarqueeClet::SetScrollDirection( TIRScrollDirection aScrollDirection ) |
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{ |
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iScrollDirection = aScrollDirection; |
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} |
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// --------------------------------------------------------------------------- |
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// Sets the scroll style. |
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// --------------------------------------------------------------------------- |
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// |
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void TIRMarqueeClet::SetScrollStyle( TIRScrollStyle aScrollStyle ) |
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{ |
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iScrollStyle = aScrollStyle; |
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} |
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// --------------------------------------------------------------------------- |
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// Starts scrolling. |
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// --------------------------------------------------------------------------- |
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// |
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void TIRMarqueeClet::StartL( TInt aDelay, TInt aSnooze ) |
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{ |
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108 |
ASSERT( iViewport ); |
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109 |
ASSERT( iTextVisual ); |
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110 |
|
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111 |
iViewport->SetViewportSize( TAlfRealPoint( 1.0f, 1.0f ), 0 ); |
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112 |
iViewport->SetVirtualSize( TAlfRealPoint( 1.0f, 1.0f ), 0 ); |
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113 |
iViewport->SetViewportPos( TAlfRealPoint( 0.0f, 0.0f ), 0 ); |
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114 |
|
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115 |
iTextVisual->Owner().Env().CancelCustomCommands( this ); |
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116 |
|
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iSnoozeTime = aSnooze; |
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118 |
|
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119 |
// Get original text width in pixels. |
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120 |
iOriginalTextWidth = iTextVisual->TextExtents().iWidth; |
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121 |
TInt targetWidth = iViewport->Size().Target().AsSize().iWidth; |
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122 |
|
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123 |
// Check if loop scrolling and if the text does not fit to the viewport size. |
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124 |
if ( iScrollStyle == TIRMarqueeClet::EIRScrollStyleLoop && iOriginalTextWidth > targetWidth ) |
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125 |
{ |
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126 |
// Create continuously scrolling text (text + 5 spaces + text). |
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127 |
RBuf buffer; |
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128 |
CleanupClosePushL( buffer ); |
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129 |
buffer.CreateL( 2 * iOriginalTextWidth + KVRSpace().Length() ); |
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130 |
buffer.Append( iTextVisual->Text() ); |
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131 |
buffer.Append( KVRSpace ); |
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132 |
buffer.Append( iTextVisual->Text() ); |
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133 |
iTextVisual->SetTextL( buffer ); |
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134 |
CleanupStack::PopAndDestroy(&buffer);// buffer |
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135 |
} |
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136 |
|
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137 |
// Text size to display. |
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138 |
iScrollSize = iTextVisual->TextExtents(); |
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139 |
|
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140 |
// Check if text must be scrolled. |
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141 |
if ( iScrollSize.iWidth > targetWidth ) |
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142 |
{ |
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143 |
// Set line wrapping to truncate: if text does not fit to the viewport width, the text is |
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144 |
// truncated with ellipsis (...). |
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145 |
iTextVisual->SetWrapping( CAlfTextVisual::ELineWrapTruncate ); |
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146 |
// Decides the correct directionality for the scroll. |
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147 |
TBidiText::TDirectionality directionality = TBidiText:: |
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148 |
TextDirectionality( iTextVisual->Text() ); |
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149 |
if ( directionality == TBidiText::ELeftToRight ) |
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150 |
{ |
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151 |
SetScrollDirection( TIRMarqueeClet::EIRScrollDirectionLeft ); |
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152 |
} |
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153 |
else |
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154 |
{ |
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155 |
SetScrollDirection( TIRMarqueeClet::EIRScrollDirectionRight ); |
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156 |
} |
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157 |
// Align horizontally. |
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158 |
iTextVisual->SetAlign( EAlfAlignHLocale, EAlfAlignVCenter ); |
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159 |
// Start scrolling. |
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160 |
iTextVisual->Owner().Env().Send( TAlfCustomEventCommand( |
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161 |
TIRMarqueeClet::EIRCustomEventScrollStarted, this ), aDelay ); |
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162 |
} |
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163 |
} |
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164 |
|
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165 |
// --------------------------------------------------------------------------- |
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166 |
// From class CAlfControl. |
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167 |
// Event handler. |
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168 |
// --------------------------------------------------------------------------- |
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169 |
// |
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170 |
TBool TIRMarqueeClet::OfferEventL( const TAlfEvent& aEvent ) |
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171 |
{ |
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172 |
TBool eventHandled = EFalse; |
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173 |
|
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174 |
if ( aEvent.IsCustomEvent() && iViewport ) |
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175 |
{ |
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176 |
switch ( aEvent.CustomParameter() ) |
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177 |
{ |
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178 |
case TIRMarqueeClet::EIRCustomEventScrollCompleted: |
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179 |
{ |
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180 |
// Viewport is reset. |
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181 |
iViewport->SetVirtualSize( TAlfRealPoint( 1.0f, 1.0f ), 0 ); |
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|
182 |
iViewport->SetViewportPos( TAlfRealPoint( 0.0f, 0.0f ), 0 ); |
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|
183 |
// Set line wrapping to truncate. |
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|
184 |
iTextVisual->SetWrapping( CAlfTextVisual::ELineWrapTruncate ); |
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|
185 |
eventHandled = ETrue; |
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|
186 |
break; |
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187 |
} |
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188 |
case TIRMarqueeClet::EIRCustomEventScrollStarted: |
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|
189 |
{ |
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190 |
// Visible scroll space width. |
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191 |
TReal32 visibleWidth = iViewport->Size().Target().iX; |
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|
192 |
|
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193 |
// One scroll width. |
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194 |
TReal32 overflowWidth( 0.0f ); |
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195 |
switch ( iScrollStyle ) |
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196 |
{ |
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|
197 |
case TIRMarqueeClet::EIRScrollStyleOnce: |
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198 |
overflowWidth = iScrollSize.iWidth - visibleWidth; |
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|
199 |
break; |
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|
200 |
case TIRMarqueeClet::EIRScrollStyleLoop: |
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|
201 |
// In EIRScrollStyleLoop mode, the scrolling width is |
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202 |
// the width of the original text + the trailing spaces. |
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203 |
overflowWidth = iScrollSize.iWidth - iOriginalTextWidth; |
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204 |
break; |
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205 |
default: |
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|
206 |
break; |
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|
207 |
} |
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|
208 |
|
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|
209 |
// Width ratio. |
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|
210 |
TReal32 widthRatio = overflowWidth / visibleWidth; |
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|
211 |
// Target position. |
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212 |
TAlfRealPoint target( iViewport->Pos().Target() ); |
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// Coordinate space used for scrolling. |
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TAlfRealPoint virt( widthRatio + 1.0f, 1.0f ); |
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// Start position. |
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iOrigin = iViewport->Pos().ValueNow(); |
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// Scrolling time in milliseconds. |
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TInt scrollTime = KVRScrollTime * |
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static_cast<TInt>( overflowWidth / iScrollSpeed ); |
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220 |
|
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switch ( iScrollDirection ) |
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{ |
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case TIRMarqueeClet::EIRScrollDirectionLeft: |
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iOrigin.iX = 0.0f; |
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target.iX = widthRatio; |
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break; |
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case TIRMarqueeClet::EIRScrollDirectionRight: |
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iOrigin.iX = widthRatio; |
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target.iX = 0.0f; |
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break; |
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231 |
default: |
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232 |
break; |
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} |
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234 |
|
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// Set virtual size for scrolling. |
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iViewport->SetVirtualSize( virt, 0 ); |
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// Set viewport to start position. |
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iViewport->SetViewportPos( iOrigin, 0 ); |
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// Start scrolling to target position. |
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iViewport->SetViewportPos( target, scrollTime ); |
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241 |
|
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// Set line wrapping to manual. |
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243 |
iTextVisual->SetWrapping( CAlfTextVisual::ELineWrapManual ); |
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244 |
|
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switch ( iScrollStyle ) |
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246 |
{ |
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case TIRMarqueeClet::EIRScrollStyleOnce: |
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// Send EIRCustomEventScrollCompleted after scrolling is ended. |
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iTextVisual->Owner().Env().Send( TAlfCustomEventCommand( |
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TIRMarqueeClet::EIRCustomEventScrollCompleted, this ), |
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251 |
scrollTime + iSnoozeTime ); |
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252 |
break; |
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253 |
case TIRMarqueeClet::EIRScrollStyleLoop: |
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254 |
// Start loop scrolling immediately after previous scrolling has ended. |
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255 |
iTextVisual->Owner().Env().Send( TAlfCustomEventCommand( |
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256 |
TIRMarqueeClet::EIRCustomEventScrollStarted, this ), scrollTime ); |
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257 |
break; |
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258 |
default: |
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Revision: 201011
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259 |
break; |
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Revision: 201011
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260 |
} |
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|
261 |
|
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|
262 |
eventHandled = ETrue; |
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|
263 |
break; |
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|
264 |
} |
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|
265 |
default: |
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Revision: 201011
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|
266 |
break; |
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|
267 |
} |
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|
268 |
} |
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Revision: 201011
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|
269 |
|
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diff
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|
270 |
|
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|
271 |
return eventHandled; |
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|
272 |
} |
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parents:
diff
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|
273 |
|
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|
274 |
// End of file |