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1 /* |
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2 * Copyright (c) 2007 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 * List navigator, which is used when a list contains more elements than should be shown at a time |
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17 * |
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18 */ |
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19 package com.nokia.tracebuilder.view; |
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20 |
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21 import com.nokia.tracebuilder.action.TraceViewActionProvider; |
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22 |
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23 /** |
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24 * List navigator, which is used when a list contains more elements than should |
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25 * be shown at a time |
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26 * |
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27 */ |
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28 final class ListNavigator extends WrapperBase { |
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29 |
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30 /** |
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31 * Action provider |
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32 */ |
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33 private ListNavigatorActionProvider actionProvider; |
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34 |
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35 /** |
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36 * Index of the first element currently visible |
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37 */ |
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38 private int startIndex; |
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39 |
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40 /** |
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41 * Number of visible elements |
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42 */ |
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43 private int visibleCount; |
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44 |
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45 /** |
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46 * Total number of elements |
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47 */ |
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48 private int totalCount; |
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49 |
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50 /** |
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51 * Constructor |
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52 * |
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53 * @param parent |
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54 * the parent wrapper |
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55 * @param updater |
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56 * the update notifier |
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57 */ |
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58 protected ListNavigator(ListWrapper parent, WrapperUpdater updater) { |
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59 super(parent, updater); |
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60 actionProvider = new ListNavigatorActionProvider(parent); |
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61 } |
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62 |
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63 /* |
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64 * (non-Javadoc) |
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65 * |
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66 * @see com.nokia.tracebuilder.view.WrapperBase#getChildren() |
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67 */ |
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68 @Override |
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69 public Object[] getChildren() { |
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70 return new Object[0]; |
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71 } |
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72 |
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73 /* |
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74 * (non-Javadoc) |
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75 * |
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76 * @see com.nokia.tracebuilder.view.WrapperBase#hasChildren() |
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77 */ |
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78 @Override |
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79 public boolean hasChildren() { |
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80 return false; |
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81 } |
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82 |
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83 /** |
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84 * Gets the start index of visible elements |
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85 * |
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86 * @return the start index |
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87 */ |
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88 int getStartIndex() { |
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89 return startIndex; |
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90 } |
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91 |
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92 /** |
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93 * Gets the number of visible elements |
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94 * |
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95 * @return the visible element count |
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96 */ |
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97 int getVisibleCount() { |
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98 return visibleCount; |
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99 } |
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100 |
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101 /** |
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102 * Gets the total length of elements |
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103 * |
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104 * @return the total count |
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105 */ |
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106 int getTotalCount() { |
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107 return totalCount; |
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108 } |
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109 |
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110 /** |
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111 * Gets the action provider interface |
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112 * |
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113 * @return the action provider |
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114 */ |
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115 public TraceViewActionProvider getActionProvider() { |
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116 return actionProvider; |
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117 } |
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118 |
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119 /** |
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120 * Sets the index to currently visible area |
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121 * |
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122 * @param startIndex |
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123 * @param visibleCount |
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124 * @param totalCount |
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125 */ |
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126 void setIndex(int startIndex, int visibleCount, int totalCount) { |
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127 this.startIndex = startIndex; |
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128 this.visibleCount = visibleCount; |
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129 this.totalCount = totalCount; |
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130 if (startIndex + visibleCount >= totalCount) { |
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131 actionProvider.setNextEnabled(false); |
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132 actionProvider.setPreviousEnabled(true); |
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133 } else if (startIndex == 0) { |
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134 actionProvider.setNextEnabled(true); |
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135 actionProvider.setPreviousEnabled(false); |
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136 } else { |
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137 actionProvider.setNextEnabled(true); |
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138 actionProvider.setPreviousEnabled(true); |
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139 } |
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140 } |
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141 |
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142 } |