author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 14 May 2010 16:57:01 +0300 | |
changeset 2 | 49c70dcc3f17 |
parent 1 | e48454f237ca |
child 3 | c863538fcbb6 |
permissions | -rw-r--r-- |
1
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/* |
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* Copyright (c) 2009 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: |
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* |
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*/ |
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#include "buffermanager.h" |
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#include <qglobal.h> |
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|
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BufferManager::BufferManager( |
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AbstractDataProvider* aObserver, |
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int aBufferSize, |
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int aBufferTreshold, |
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int aInitialPosition, |
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int aTotalCount ) |
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: |
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mObserver(aObserver), |
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mBufferSize( aBufferSize ), |
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mBufferTreshold( aBufferTreshold ), |
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mBufferPosition( aInitialPosition ), |
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mTotalCount( aTotalCount ) |
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{ |
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mBufferPosition -= (mBufferSize / 2); |
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if( mBufferPosition + mBufferSize > mTotalCount - 1 ){ |
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mBufferPosition = (mTotalCount - 1) - mBufferSize; |
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} |
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if(mBufferPosition < 0 ){ |
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mBufferPosition = 0; |
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} |
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mDiff = 0; |
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//request Initial Buffer |
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mRequestStart = mBufferPosition; |
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mRequestCount = mBufferSize; |
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calculate(); |
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} |
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BufferManager::~BufferManager() |
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{ |
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} |
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void BufferManager::resizeCache(int newSize, int newTreshold) |
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{ |
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if (newTreshold != mBufferTreshold){ |
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mBufferTreshold = newTreshold; |
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} |
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if (newSize!=mBufferSize){ |
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// int pos = mBufferPosition + (mBufferSize / 2); |
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int a = qMax(0, mBufferPosition + mBufferSize/2 - newSize/2); |
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int b = qMin(a + newSize, mTotalCount); |
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if ( b == mTotalCount){ |
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a = mTotalCount - newSize; |
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} |
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int c = qMax(0, mBufferPosition); |
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int d = qMin(c + mBufferSize, mTotalCount); |
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if ( d == mTotalCount){ |
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c = mTotalCount - mBufferSize; |
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} |
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if ( newSize>mBufferSize){ |
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mObserver->request(a, c-1, AbstractDataProvider::ascending); |
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mObserver->request(d, b-1, AbstractDataProvider::ascending); |
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}else if ( newSize<mBufferSize){ |
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mObserver->release(c, a-1); |
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mObserver->release(b, d); |
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} |
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mBufferPosition = a; |
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mBufferSize = newSize; |
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} |
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} |
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void BufferManager::calculate() |
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{ |
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AbstractDataProvider::requestsOrder direction = AbstractDataProvider::ascending; |
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if(mResetOrdered){ |
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mResetOrdered = false; |
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} else { |
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if(mDiff < 0){ |
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mReleaseStart = mBufferPosition; |
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mRequestStart = mBufferPosition + mBufferSize; |
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direction = AbstractDataProvider::ascending; |
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} else if( mDiff > 0) { |
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mReleaseStart = mBufferPosition + mBufferSize - mDiff; |
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mRequestStart = mBufferPosition - mDiff; |
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direction = AbstractDataProvider::descending; |
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} |
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} |
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|
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// Release |
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108 |
int end = mReleaseStart + mReleaseCount < mTotalCount ? |
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109 |
mReleaseStart + mReleaseCount: mTotalCount; |
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110 |
end--; |
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|
111 |
if(end >= mReleaseStart ){ |
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112 |
mObserver->release(mReleaseStart, end); |
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113 |
} |
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114 |
|
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115 |
mReleaseCount = 0; |
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116 |
|
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117 |
// Request |
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118 |
end = mRequestStart + mRequestCount < mTotalCount ? |
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119 |
mRequestStart + mRequestCount : mTotalCount; |
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120 |
|
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121 |
end--; |
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122 |
if(end >= mRequestStart ){ |
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123 |
mObserver->request(mRequestStart, end, direction); |
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124 |
} |
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125 |
|
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126 |
mRequestCount = 0; |
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127 |
|
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128 |
// Move Buffer |
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129 |
mBufferPosition -= mDiff; |
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130 |
// Reset Diff |
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131 |
mDiff = 0; |
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132 |
} |
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133 |
|
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134 |
// ----------------------------------------------------------------------------- |
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135 |
// BufferManager::SetPosition() |
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136 |
// ----------------------------------------------------------------------------- |
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137 |
// |
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138 |
void BufferManager::setPosition( int aIndex ) |
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139 |
{ |
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140 |
// If all the items fit in the buffer no need to move the buffer |
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141 |
if(mTotalCount <= mBufferSize) return; |
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142 |
|
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143 |
bool forceUpdate = false; |
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144 |
aIndex -= mBufferSize / 2; // normalize index to Buffer start |
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145 |
|
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146 |
if(aIndex < 0){ |
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147 |
aIndex = 0; |
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148 |
forceUpdate = true; |
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149 |
}else if( aIndex > mTotalCount - mBufferSize ){ |
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150 |
aIndex = mTotalCount - mBufferSize; |
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151 |
forceUpdate = true; |
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152 |
} |
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|
153 |
|
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154 |
mDiff = mBufferPosition - aIndex; |
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|
155 |
|
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156 |
// Too large change reset whole buffer |
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157 |
if( mDiff >= mBufferSize || -mDiff >= mBufferSize || mResetOrdered ) { |
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|
158 |
resetBuffer(aIndex + (mBufferSize/2), mTotalCount); |
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159 |
} else if( mDiff >= mBufferTreshold ) { // Move Up |
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160 |
mRequestCount = mDiff; |
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161 |
mReleaseCount = mDiff; |
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162 |
calculate(); |
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163 |
} else if ( -mDiff >= mBufferTreshold ) {// Move Down |
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164 |
mRequestCount = -mDiff; |
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165 |
mReleaseCount = -mDiff; |
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166 |
calculate(); |
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|
167 |
} else if( forceUpdate && mDiff ) { // Top or bottom has been reached |
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168 |
int diff = mDiff < 0 ? -mDiff : mDiff; |
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169 |
mRequestCount = diff; |
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170 |
mReleaseCount = diff; |
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171 |
calculate(); |
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|
172 |
} |
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173 |
} |
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|
174 |
|
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|
175 |
// ----------------------------------------------------------------------------- |
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176 |
// BufferManager::ResetBuffer() |
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177 |
// ----------------------------------------------------------------------------- |
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178 |
// |
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179 |
void BufferManager::resetBuffer( int aPosition, int aTotalCount) |
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180 |
{ |
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|
181 |
if( !mResetOrdered ){ |
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182 |
// release Old buffer |
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183 |
mReleaseStart = mBufferPosition; |
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|
184 |
mReleaseCount = mBufferSize; |
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185 |
} |
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|
186 |
|
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187 |
// set position and count |
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188 |
mBufferPosition = aPosition - (mBufferSize / 2); |
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|
189 |
mTotalCount = aTotalCount; |
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190 |
mDiff = 0; |
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|
191 |
|
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|
192 |
if( mBufferPosition + mBufferSize > mTotalCount - 1 ){ |
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|
193 |
mBufferPosition = mTotalCount - mBufferSize; |
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194 |
} |
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|
195 |
|
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|
196 |
if(mBufferPosition < 0 ){ |
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|
197 |
mBufferPosition = 0; |
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198 |
} |
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|
199 |
|
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200 |
//request new Buffer |
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|
201 |
mRequestStart = mBufferPosition; |
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|
202 |
mRequestCount = mBufferSize; |
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|
203 |
mResetOrdered = true; |
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204 |
calculate(); |
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205 |
} |
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206 |
|
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207 |
void BufferManager::itemCountChanged( int aIndex, |
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208 |
bool aRemoved, |
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209 |
int aNewTotalCount ) |
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210 |
{ |
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211 |
mTotalCount = aNewTotalCount; |
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212 |
AbstractDataProvider::requestsOrder direction = AbstractDataProvider::ascending; |
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213 |
if ( aIndex >= mBufferPosition && aIndex < mBufferPosition + mBufferSize ){ |
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214 |
// Change inside the buffer |
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215 |
if( aRemoved ){ |
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// Release removed item ( Item deleted already from the owner ) |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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217 |
mObserver->release( aIndex, aIndex ); |
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if( mTotalCount >= mBufferSize ){ |
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// There are more items to keep the buffer filled |
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if( mBufferPosition + mBufferSize <= mTotalCount ){ |
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221 |
// Requested from the end |
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mObserver->request( mBufferPosition + mBufferSize, |
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mBufferPosition + mBufferSize, |
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direction ); |
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}else if( mBufferPosition > 0 ){ |
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// Move buffer and request from the beginning |
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mBufferPosition--; |
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mObserver->request( mBufferPosition, mBufferPosition, direction); |
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} |
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} |
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}else{ |
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if( mTotalCount > mBufferSize ){ |
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// One item needs to be released |
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Revision: 201015
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if( mBufferPosition + mBufferSize < mTotalCount ){ |
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Revision: 201015
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// Release from the end of the buffer |
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Revision: 201015
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mObserver->release(mBufferPosition + mBufferSize, mBufferPosition + mBufferSize); |
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237 |
} |
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} |
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// Request added item |
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Revision: 201015
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mObserver->request(aIndex, aIndex, direction); |
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} |
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} |
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} |
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244 |