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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 * Helper system for handling Out-Of-Memory cases. |
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16 * |
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17 */ |
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18 |
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19 #ifndef XNOOMSYSHANDLER_H |
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20 #define XNOOMSYSHANDLER_H |
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21 |
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22 // System includes |
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23 #include <e32base.h> |
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24 |
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25 // Forward declarations |
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26 |
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27 // Macros |
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28 |
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29 // Bytes to kilobytes |
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30 #define B2KB(val_in_bytes) (TInt)( val_in_bytes / 1024 ) |
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31 // Kilobytes to bytes |
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32 #define KB2B(val_in_kbytes) (TInt)( val_in_kbytes * 1024 ) |
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33 |
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34 #define WIDGET_MIN_MEM CXnOomSysHandler::EMem1MB |
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35 #define VIEW_MIN_MEM CXnOomSysHandler::EMem4MB |
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36 |
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37 /** |
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38 * Class helper for handling (and preventing) out-of-memory failures |
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39 * |
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40 * This Class has only some static method. |
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41 * E.g. for showing error popup window or for checking of available memory on |
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42 * the heap. etc. |
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43 * |
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44 * @ingroup group_xnlayoutengine |
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45 * @lib xn3layoutengine.lib |
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46 * @since S60 5.0 |
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47 */ |
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48 NONSHARABLE_CLASS( CXnOomSysHandler ) : public CBase |
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49 { |
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50 public: // data types |
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51 |
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52 /** |
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53 * Enumeration of predefined values of memory amount for possible use |
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54 */ |
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55 enum TMemPredefinedValues |
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56 { |
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57 #ifdef _DEBUG |
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58 EMemOutOfRangeTest = 209715200, |
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59 #endif |
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60 EMinNotDef = 0, |
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61 EMem1kB = 1024, |
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62 EMem2kB = 2048, |
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63 EMem4kB = 4096, |
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64 EMem8kB = 8192, |
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65 EMem16kB = 16384, |
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66 EMem32kB = 32768, |
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67 EMem64kB = 65536, |
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68 EMem128kB = 131072, |
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69 EMem256kB = 262144, |
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70 EMem512kB = 524288, |
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71 EMem1MB = 1024000, |
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72 EMem2MB = 2048000, |
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73 EMem3MB = 3072000, |
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74 EMem4MB = 4096000, |
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75 EMem6MB = 6144000 |
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76 }; |
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77 |
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78 public: // Construction / destruction. |
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79 /** |
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80 * Two-phased constructor. |
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81 */ |
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82 static CXnOomSysHandler* NewL(); |
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83 |
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84 /** |
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85 * Destructor. |
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86 */ |
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87 virtual ~CXnOomSysHandler(); |
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88 |
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89 public: // methods. |
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90 /** |
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91 * Checks if required amount of free memory is available on heap. |
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92 * |
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93 * @param aAmount required amount of free memory (in Bytes - use some |
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94 * value from TMemPredefinedValues enumeration for your comfort) |
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95 * @return ETrue if required memory is available on heap, otherwise EFalse |
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96 */ |
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97 static TBool HeapAvailable( TInt aAmount = EMinNotDef ); |
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98 |
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99 /** |
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100 * Handle potential OOM failure. |
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101 */ |
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102 void HandlePotentialOomL(); |
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103 |
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104 private: // Constructors. |
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105 /** |
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106 * Symbian 2nd phase constructor. |
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107 */ |
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108 void ConstructL(); |
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109 |
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110 /** |
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111 * C++ constructor. |
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112 */ |
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113 CXnOomSysHandler(); |
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114 |
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115 private: // functions |
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116 /** |
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117 * Check whether OOM dialog can be shown. |
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118 * Prevents OOM dialogs popping up more often than |
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119 * defined in KMinInterval (defined in .cpp). |
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120 */ |
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121 TBool AllowDialog(); |
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122 |
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123 private: // Data. |
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124 /** |
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125 * OOM dialog message. |
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126 * |
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127 * Allocated early because memory might not |
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128 * be available when HandlePotentialOomL is called. |
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129 */ |
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130 HBufC* iMsg; |
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131 |
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132 /** |
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133 * Stored time stamp representing when dialog was last shown. |
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134 */ |
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135 TInt64 iPreviousDialogPopupTime; |
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136 }; |
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137 |
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138 #endif // XNOOMSYSHANDLER_H |