1 /* |
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2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 |
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18 |
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19 #include "HgScrollBufferManager.h" |
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20 #include <ganes/HgScrollBufferObserverIface.h> |
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21 |
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22 #include <e32debug.h> |
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23 |
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24 // ----------------------------------------------------------------------------- |
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25 // CHgScrollBufferManager::NewL() |
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26 // ----------------------------------------------------------------------------- |
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27 // |
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28 CHgScrollBufferManager* CHgScrollBufferManager::NewL( |
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29 MHgScrollBufferObserver& aObserver, |
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30 TInt aBufferSize, |
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31 TInt aBufferTreshold, |
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32 TInt aInitialPosition, |
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33 TInt aTotalCount ) |
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34 { |
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35 CHgScrollBufferManager* self = new (ELeave) CHgScrollBufferManager( |
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36 aObserver, |
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37 aBufferSize, |
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38 aBufferTreshold, |
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39 aInitialPosition, |
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40 aTotalCount ); |
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41 CleanupStack::PushL(self); |
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42 self->ConstructL(); |
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43 CleanupStack::Pop(self); |
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44 return self; |
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45 } |
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46 |
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47 // ----------------------------------------------------------------------------- |
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48 // CHgScrollBufferManager::CHgScrollBufferManager() |
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49 // ----------------------------------------------------------------------------- |
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50 // |
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51 CHgScrollBufferManager::CHgScrollBufferManager( |
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52 MHgScrollBufferObserver& aObserver, |
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53 TInt aBufferSize, |
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54 TInt aBufferTreshold, |
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55 TInt aInitialPosition, |
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56 TInt aTotalCount ) |
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57 : CActive( CActive::EPriorityHigh ), |
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58 iObserver( aObserver ), |
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59 iBufferSize( aBufferSize ), |
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60 iBufferTreshold( aBufferTreshold ), |
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61 iBufferPosition( aInitialPosition ), |
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62 iTotalCount( aTotalCount ) |
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63 { |
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64 |
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65 } |
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66 |
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67 // ----------------------------------------------------------------------------- |
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68 // CHgScrollBufferManager::ConstructL() |
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69 // ----------------------------------------------------------------------------- |
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70 // |
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71 void CHgScrollBufferManager::ConstructL() |
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72 { |
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73 CActiveScheduler::Add(this); |
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74 |
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75 iResetOrdered = ETrue; |
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76 ResetBuffer(iBufferPosition, iTotalCount); |
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77 } |
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78 |
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79 // ----------------------------------------------------------------------------- |
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80 // CHgScrollBufferManager::~CHgScrollBufferManager() |
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81 // ----------------------------------------------------------------------------- |
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82 // |
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83 CHgScrollBufferManager::~CHgScrollBufferManager() |
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84 { |
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85 Cancel(); |
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86 } |
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87 |
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88 // ----------------------------------------------------------------------------- |
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89 // CHgScrollBufferManager::RunL() |
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90 // ----------------------------------------------------------------------------- |
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91 // |
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92 void CHgScrollBufferManager::RunL() |
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93 { |
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94 MHgScrollBufferObserver::THgScrollDirection direction = MHgScrollBufferObserver::EHgBufferNoMove; |
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95 |
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96 if(iResetOrdered) |
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97 { |
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98 iResetOrdered = EFalse; |
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99 direction = MHgScrollBufferObserver::EHgBufferReset; |
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100 } |
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101 else |
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102 { |
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103 if(iDiff < 0) |
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104 { |
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105 iReleaseStart = iBufferPosition; |
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106 iRequestStart = iBufferPosition + iBufferSize; |
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107 direction = MHgScrollBufferObserver::EHgBufferScrollDown; |
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108 } |
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109 else if( iDiff > 0) |
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110 { |
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111 iReleaseStart = iBufferPosition + iBufferSize - iDiff; |
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112 iRequestStart = iBufferPosition - iDiff; |
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113 direction = MHgScrollBufferObserver::EHgBufferScrollUp; |
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114 } |
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115 } |
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116 |
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117 // Release |
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118 TInt end = iReleaseStart + iReleaseCount < iTotalCount ? |
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119 iReleaseStart + iReleaseCount: iTotalCount; |
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120 end--; |
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121 if(end >= iReleaseStart ) |
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122 { |
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123 iObserver.Release(iReleaseStart, end); |
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124 if(iOwner) iOwner->Release( iReleaseStart, end ); |
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125 } |
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126 |
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127 iReleaseCount = 0; |
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128 |
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129 // Request |
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130 end = iRequestStart + iRequestCount < iTotalCount ? |
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131 iRequestStart + iRequestCount : iTotalCount; |
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132 |
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133 end--; |
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134 if(end >= iRequestStart ) |
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135 iObserver.Request(iRequestStart, end, direction); |
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136 |
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137 iRequestCount = 0; |
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138 |
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139 // Move Buffer |
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140 iBufferPosition -= iDiff; |
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141 // Reset Diff |
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142 iDiff = 0; |
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143 } |
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144 |
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145 // ----------------------------------------------------------------------------- |
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146 // CHgScrollBufferManager::DoCancel() |
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147 // ----------------------------------------------------------------------------- |
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148 // |
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149 void CHgScrollBufferManager::DoCancel() |
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150 { |
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151 // Nothing to do here |
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152 } |
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153 |
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154 // ----------------------------------------------------------------------------- |
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155 // CHgScrollBufferManager::RunError() |
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156 // ----------------------------------------------------------------------------- |
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157 // |
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158 TInt CHgScrollBufferManager::RunError( TInt /*aError*/ ) |
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159 { |
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160 return KErrNone; |
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161 } |
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162 |
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163 // ----------------------------------------------------------------------------- |
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164 // CHgScrollBufferManager::SetPosition() |
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165 // ----------------------------------------------------------------------------- |
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166 // |
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167 void CHgScrollBufferManager::SetPosition( TInt aIndex ) |
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168 { |
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169 TBool forceUpdate = EFalse; |
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170 aIndex -= iBufferSize / 2; // normalize index to Buffer start |
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171 |
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172 if(aIndex < 0) |
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173 { |
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174 aIndex = 0; |
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175 forceUpdate = ETrue; |
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176 } |
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177 else if( aIndex > iTotalCount - iBufferSize ) |
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178 { |
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179 aIndex = iTotalCount - iBufferSize; |
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180 forceUpdate = ETrue; |
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181 } |
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182 |
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183 iDiff = iBufferPosition - aIndex; |
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184 |
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185 // Too large change reset whole buffer |
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186 if( iDiff >= iBufferSize || -iDiff >= iBufferSize || iResetOrdered ) |
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187 { |
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188 ResetBuffer(aIndex + (iBufferSize/2), iTotalCount); |
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189 } |
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190 // Move Up |
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191 else if( iDiff >= iBufferTreshold ) |
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192 { |
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193 iRequestCount = iDiff; |
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194 iReleaseCount = iDiff; |
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195 NotifyObserver(); |
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196 } |
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197 // Move Down |
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198 else if( -iDiff >= iBufferTreshold ) |
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199 { |
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200 iRequestCount = -iDiff; |
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201 iReleaseCount = -iDiff; |
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202 NotifyObserver(); |
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203 } |
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204 // Top or bottom has been reached |
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205 else if( forceUpdate && iDiff ) |
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206 { |
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207 TInt diff = iDiff < 0 ? -iDiff : iDiff; |
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208 iRequestCount = diff; |
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209 iReleaseCount = diff; |
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210 NotifyObserver(); |
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211 } |
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212 } |
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213 |
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214 // ----------------------------------------------------------------------------- |
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215 // CHgScrollBufferManager::SetTotalCount() |
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216 // ----------------------------------------------------------------------------- |
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217 // |
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218 void CHgScrollBufferManager::SetTotalCount( TInt aTotalCount ) |
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219 { |
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220 iTotalCount = aTotalCount; |
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221 } |
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222 |
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223 // ----------------------------------------------------------------------------- |
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224 // CHgScrollBufferManager::SetBufferOwner() |
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225 // ----------------------------------------------------------------------------- |
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226 // |
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227 void CHgScrollBufferManager::SetBufferOwner( MHgBufferOwner& aOwner ) |
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228 { |
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229 iOwner = &aOwner; |
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230 } |
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231 |
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232 // ----------------------------------------------------------------------------- |
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233 // CHgScrollBufferManager::ResetBuffer() |
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234 // ----------------------------------------------------------------------------- |
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235 // |
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236 void CHgScrollBufferManager::ResetBuffer( TInt aPosition, TInt aTotalCount) |
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237 { |
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238 if( !iResetOrdered ) |
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239 { |
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240 // release Old buffer |
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241 iReleaseStart = iBufferPosition; |
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242 iReleaseCount = iBufferSize; |
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243 } |
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244 |
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245 // set position and count |
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246 iBufferPosition = aPosition - (iBufferSize / 2); |
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247 iTotalCount = aTotalCount; |
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248 iDiff = 0; |
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249 |
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250 if( iBufferPosition + iBufferSize > iTotalCount - 1 ) |
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251 { |
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252 iBufferPosition = iTotalCount - iBufferSize; |
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253 } |
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254 |
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255 if(iBufferPosition < 0 ) |
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256 { |
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257 iBufferPosition = 0; |
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258 } |
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259 |
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260 //request new Buffer |
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261 iRequestStart = iBufferPosition; |
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262 iRequestCount = iBufferSize; |
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263 iResetOrdered = ETrue; |
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264 |
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265 NotifyObserver(); |
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266 } |
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267 |
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268 // ----------------------------------------------------------------------------- |
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269 // CHgScrollBufferManager::NotifyObserver() |
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270 // ----------------------------------------------------------------------------- |
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271 // |
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272 void CHgScrollBufferManager::NotifyObserver() |
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273 { |
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274 if( !IsActive() ) |
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275 { |
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276 SetActive(); |
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277 TRequestStatus* status = &iStatus; |
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278 User::RequestComplete(status, KErrNone); |
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279 } |
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280 } |
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281 |
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282 // ----------------------------------------------------------------------------- |
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283 // CHgScrollBufferManager::ItemChanged() |
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284 // ----------------------------------------------------------------------------- |
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285 // |
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286 void CHgScrollBufferManager::ItemCountChanged( |
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287 TInt aIndex, |
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288 TBool aRemoved, |
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289 TInt aNewTotalCount ) |
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290 { |
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291 iTotalCount = aNewTotalCount; |
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292 if ( aIndex >= iBufferPosition && aIndex < iBufferPosition + iBufferSize ) |
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293 { |
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294 // Change inside the buffer |
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295 MHgScrollBufferObserver::THgScrollDirection direction = MHgScrollBufferObserver::EHgBufferNoMove; |
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296 if( aRemoved ) |
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297 { |
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298 // Release removed item ( Item deleted already from the owner ) |
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299 iObserver.Release( aIndex, aIndex ); |
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300 if( iTotalCount >= iBufferSize ) |
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301 { |
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302 // There are more items to keep the buffer filled |
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303 if( iBufferPosition + iBufferSize <= iTotalCount ) |
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304 { |
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305 // Requested from the end |
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306 iObserver.Request( iBufferPosition + iBufferSize - 1, |
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307 iBufferPosition + iBufferSize - 1, direction ); |
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308 } |
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309 else if( iBufferPosition > 0 ) |
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310 { |
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311 // Move buffer and request from the beginning |
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312 iBufferPosition--; |
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313 iObserver.Request( iBufferPosition, iBufferPosition, direction ); |
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314 } |
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315 } |
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316 } |
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317 else |
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318 { |
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319 if( iTotalCount > iBufferSize ) |
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320 { |
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321 // One item needs to be released |
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322 if( iBufferPosition + iBufferSize < iTotalCount ) |
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323 { |
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324 // Release from the end of the buffer |
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325 iObserver.Release(iBufferPosition + iBufferSize, iBufferPosition + iBufferSize); |
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326 if(iOwner) |
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327 iOwner->Release(iBufferPosition + iBufferSize, iBufferPosition + iBufferSize); |
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328 } |
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329 } |
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330 // Request added item |
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331 iObserver.Request(aIndex, aIndex, direction); |
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332 } |
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333 } |
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334 } |
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335 |
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