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annotate MetroWpf/FxRates.UI/Controls/TimerTextBlock.cs @ 97:1adc1ae981ea

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Tests added to SilverlightValidation.Tests
author stevenhollidge <stevenhollidge@hotmail.com>
date Sat, 05 May 2012 16:39:00 +0100
parents a8b50a087544
children
rev   line source
24
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1 using System;
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2 using System.Threading;
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3 using System.Windows;
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4 using System.Windows.Controls;
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5 using System.Windows.Data;
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6 using System.Windows.Documents;
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7
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8 namespace FxRates.UI.Controls
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9 {
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10 public delegate void Invoker();
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11
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12 public class TimerTextBlock : TextBlock
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13 {
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14 //private static Timer _UpdateTimer = new Timer(UpdateTimer, null, 1000, 1000);
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15
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16 public static readonly DependencyProperty TimeSpanProperty =
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17 DependencyProperty.Register("TimeSpan", typeof (TimeSpan), typeof (TimerTextBlock),
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18 new UIPropertyMetadata(TimeSpan.Zero));
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19
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20 public static readonly DependencyProperty IsStartedProperty =
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21 DependencyProperty.Register("IsStarted", typeof (bool), typeof (TimerTextBlock),
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22 new UIPropertyMetadata(false));
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23
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24 public static readonly DependencyProperty TimeFormatProperty =
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25 DependencyProperty.Register("TimeFormat", typeof (string), typeof (TimerTextBlock),
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26 new UIPropertyMetadata(null));
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27
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28 public static readonly DependencyProperty IsCountDownProperty =
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29 DependencyProperty.Register("IsCountDown", typeof (bool), typeof (TimerTextBlock),
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30 new UIPropertyMetadata(false));
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31
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32 private Invoker _UpdateTimeInvoker;
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33
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34 public TimerTextBlock()
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35 {
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36 Init();
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37 }
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38
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39 public TimerTextBlock(Inline inline) : base(inline)
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40 {
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41 Init();
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42 }
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43
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44 /// <summary>
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45 /// Represents the time remaining for the count down to complete if
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46 /// the control is initialized as a count down timer otherwise, it
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47 /// represents the time elapsed since the timer has started.
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48 /// </summary>
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49 /// <exception cref="System.ArgumentException">
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50 /// </exception>
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51 public TimeSpan TimeSpan
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52 {
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53 get { return (TimeSpan) GetValue(TimeSpanProperty); }
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54 set
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55 {
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56 if (value < TimeSpan.Zero)
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57 throw new ArgumentException();
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58
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59 SetValue(TimeSpanProperty, value);
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60 }
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61 }
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62
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63 // Using a DependencyProperty as the backing store for TimeSpan. This enables animation, styling, binding, etc...
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64
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65 public bool IsStarted
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66 {
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67 get { return (bool) GetValue(IsStartedProperty); }
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68 set { SetValue(IsStartedProperty, value); }
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69 }
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70
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71 // Using a DependencyProperty as the backing store for IsStarted. This enables animation, styling, binding, etc...
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72
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73 /// <summary>
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74 /// Format string for displaying the time span value.
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75 /// </summary>
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76 public string TimeFormat
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77 {
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78 get { return (string) GetValue(TimeFormatProperty); }
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79 set { SetValue(TimeFormatProperty, value); }
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80 }
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81
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82 // Using a DependencyProperty as the backing store for TimeFormat. This enables animation, styling, binding, etc...
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83
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84 /// <summary>
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85 /// Represents whether the control is a CountDown or regular timer.
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86 /// </summary>
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87 public bool IsCountDown
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88 {
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89 get { return (bool) GetValue(IsCountDownProperty); }
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90 set { SetValue(IsCountDownProperty, value); }
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91 }
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92
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93 public event EventHandler OnCountDownComplete;
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94
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95 private static event EventHandler OnTick;
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96
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97 private void Init()
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98 {
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99 Loaded += TimerTextBlock_Loaded;
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100 Unloaded += TimerTextBlock_Unloaded;
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101 }
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102
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103 ~TimerTextBlock()
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104 {
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105 Dispose();
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106 }
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107
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108 public void Dispose()
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109 {
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110 OnTick -= TimerTextBlock_OnTick;
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111 }
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112
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113 // Using a DependencyProperty as the backing store for IsCountDown. This enables animation, styling, binding, etc...
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114
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115 /// <summary>
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116 /// Sets the time span to zero and stops the timer.
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117 /// </summary>
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118 public void Reset()
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119 {
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120 IsStarted = false;
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121 TimeSpan = TimeSpan.Zero;
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122 }
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123
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124 private static void UpdateTimer(object state)
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125 {
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126 EventHandler onTick = OnTick;
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127 if (onTick != null)
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128 onTick(null, EventArgs.Empty);
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129 }
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130
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131 private void TimerTextBlock_Loaded(object sender, RoutedEventArgs e)
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132 {
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133 var binding = new Binding("TimeSpan");
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134 binding.Source = this;
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135 binding.Mode = BindingMode.OneWay;
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136 binding.StringFormat = TimeFormat;
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137
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138 SetBinding(TextProperty, binding);
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139
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140 _UpdateTimeInvoker = UpdateTime;
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141
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142 OnTick += TimerTextBlock_OnTick;
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143 }
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144
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145 private void TimerTextBlock_Unloaded(object sender, RoutedEventArgs e)
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146 {
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147 OnTick -= TimerTextBlock_OnTick;
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148 }
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149
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150 private void TimerTextBlock_OnTick(object sender, EventArgs e)
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151 {
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152 Dispatcher.Invoke(_UpdateTimeInvoker);
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153 }
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154
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155 private void UpdateTime()
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156 {
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157 if (IsStarted)
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158 {
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159 TimeSpan step = TimeSpan.FromSeconds(1);
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160 if (IsCountDown)
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161 {
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162 if (TimeSpan >= TimeSpan.FromSeconds(1))
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163 {
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164 TimeSpan -= step;
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165 if (TimeSpan.TotalSeconds <= 0)
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166 {
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167 TimeSpan = TimeSpan.Zero;
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168 IsStarted = false;
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169 NotifyCountDownComplete();
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170 }
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171 }
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172 }
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173 else
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174 {
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175 TimeSpan += step;
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176 }
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177 }
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178 }
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179
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180 private void NotifyCountDownComplete()
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181 {
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182 EventHandler handler = OnCountDownComplete;
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183 if (handler != null)
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184 handler(this, EventArgs.Empty);
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185 }
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186 }
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187 }