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1 /* |
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2 * Copyright (c) 2008-2009 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: Utility class for managing the screen size |
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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 |
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20 |
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21 #ifndef __CGLXRESOLUTIONUTILITY_H__ |
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22 #define __CGLXRESOLUTIONUTILITY_H__ |
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23 |
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24 #include <e32cmn.h> // for RPointerArray |
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25 #include <e32base.h> |
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26 |
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27 // forward declarations |
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28 class MGlxResolutionChangeObserver; |
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29 class MGlxResolutionSize; |
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30 |
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31 |
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32 /** |
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33 * Class Description |
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34 * Singleton containing resolution utility methods |
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35 * @author Loughlin |
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36 */ |
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37 NONSHARABLE_CLASS (CGlxResolutionUtility) : public CBase |
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38 { |
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39 public: |
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40 /** |
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41 * Construction of singleton |
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42 * @return A pointer to the single instance of CGlxResolutionUtility |
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43 */ |
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44 IMPORT_C static CGlxResolutionUtility* InstanceL(); |
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45 |
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46 /** |
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47 * Destroys the renderer instance of CGlxResolutionUtility when the |
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48 * reference count is zero |
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49 */ |
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50 IMPORT_C void Close(); |
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51 |
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52 /** |
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53 * Get the screen size |
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54 * @return The screen size in POSS |
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55 */ |
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56 IMPORT_C TSize ScreenSize() const; |
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57 |
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58 /** |
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59 * Get the lenght of in POSS |
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60 * @param The lenght in pixels which is to be converted to POSS |
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61 * @return The converted lenght & width in POSS |
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62 */ |
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63 IMPORT_C TReal32 PixelsToPoss( const TReal32& aLenPixels ) const; |
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64 |
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65 /** |
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66 * Get the lenght of in pixels |
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67 * @param The length in POSS which is to be converted to pixels |
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68 * @return The converted size in pixels |
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69 */ |
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70 IMPORT_C TReal32 PossToPixels( const TReal32& aSzPoss ) const; |
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71 |
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72 /** |
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73 * Add a resolution change observer |
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74 * @param The observer that will recieve notification on resolution |
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75 * change |
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76 */ |
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77 IMPORT_C void AddObserverL( MGlxResolutionChangeObserver& aObserver ); |
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78 |
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79 /** |
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80 * Remove a resolution change observer |
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81 * @param The observer that will no longer recieve notification on |
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82 * resolution change |
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83 */ |
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84 IMPORT_C void RemoveObserver( MGlxResolutionChangeObserver& aObserver ); |
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85 |
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86 public: // not exported |
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87 |
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88 /** |
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89 * Receives notification of a change in the screen size |
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90 * All resolution observers are notified of the resolution change |
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91 * @param aScreenSize the new screen size |
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92 */ |
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93 void SetScreenSizeL( TSize aScreenSize ); |
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94 |
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95 private: |
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96 |
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97 /** |
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98 * Symbian constructor - used by SingletonStore to create instance |
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99 */ |
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100 static CGlxResolutionUtility* NewL(); |
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101 |
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102 /** |
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103 * C++ constructor |
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104 */ |
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105 CGlxResolutionUtility(); |
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106 |
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107 /** |
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108 * 2 Phase ctor |
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109 */ |
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110 void ConstructL(); |
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111 /** |
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112 * Destructor |
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113 */ |
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114 ~CGlxResolutionUtility(); |
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115 |
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116 private: // class member variables |
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117 |
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118 // Size of the screen |
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119 TSize iScreenSize; |
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120 // Screen Size aspect ratio - POSS is a unit of measurement |
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121 // where 1 == the longest screen axis |
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122 TReal32 iOnePossToPixelRatio; |
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123 // The ratio of pixels to poss - stored to save on division |
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124 TReal32 iPixelToPossRatio; |
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125 // Own: The container for the event observers |
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126 RPointerArray < MGlxResolutionChangeObserver > iObserverList; |
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127 }; |
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128 |
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129 #endif //__CGLXRESOLUTIONUTILITY_H__ |