1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Linq;
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4 | using System.Text;
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5 | using System.Windows;
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6 | using System.Windows.Controls;
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7 | using System.Windows.Input;
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8 | using System.Windows.Threading;
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9 |
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10 | namespace Microsoft.Research.DynamicDataDisplay.Charts.Navigation
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11 | {
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12 | public sealed class LongOperationsIndicator : IPlotterElement
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13 | {
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14 | public LongOperationsIndicator()
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15 | {
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16 | timer.Tick += new EventHandler(timer_Tick);
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17 | }
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18 |
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19 | private void timer_Tick(object sender, EventArgs e)
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20 | {
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21 | UpdateWaitIndicator();
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22 | timer.Stop();
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23 | }
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24 |
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25 | #region IPlotterElement Members
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26 |
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27 | void IPlotterElement.OnPlotterAttached(Plotter plotter)
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28 | {
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29 | this.plotter = plotter;
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30 | }
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31 |
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32 | void IPlotterElement.OnPlotterDetaching(Plotter plotter)
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33 | {
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34 | this.plotter = null;
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35 | }
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36 |
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37 | private Plotter plotter;
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38 | Plotter IPlotterElement.Plotter
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39 | {
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40 | get { return plotter; }
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41 | }
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42 |
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43 | #endregion
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44 |
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45 | #region LongOperationRunning
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46 |
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47 | public static void BeginLongOperation(DependencyObject obj)
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48 | {
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49 | obj.SetValue(LongOperationRunningProperty, true);
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50 | }
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51 |
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52 | public static void EndLongOperation(DependencyObject obj)
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53 | {
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54 | obj.SetValue(LongOperationRunningProperty, false);
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55 | }
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56 |
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57 | public static bool GetLongOperationRunning(DependencyObject obj)
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58 | {
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59 | return (bool)obj.GetValue(LongOperationRunningProperty);
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60 | }
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61 |
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62 | public static void SetLongOperationRunning(DependencyObject obj, bool value)
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63 | {
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64 | obj.SetValue(LongOperationRunningProperty, value);
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65 | }
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66 |
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67 | public static readonly DependencyProperty LongOperationRunningProperty = DependencyProperty.RegisterAttached(
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68 | "LongOperationRunning",
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69 | typeof(bool),
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70 | typeof(LongOperationsIndicator),
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71 | new FrameworkPropertyMetadata(false, OnLongOperationRunningChanged));
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72 |
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73 | private static void OnLongOperationRunningChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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74 | {
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75 | Plotter plotter = null;
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76 | IPlotterElement element = d as IPlotterElement;
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77 | if (element == null)
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78 | {
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79 | plotter = Plotter.GetPlotter(d);
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80 | }
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81 | else
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82 | {
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83 | plotter = element.Plotter;
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84 | }
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85 |
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86 | if (plotter != null)
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87 | {
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88 | var indicator = plotter.Children.OfType<LongOperationsIndicator>().FirstOrDefault();
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89 | if (indicator != null)
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90 | {
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91 | indicator.OnLongOperationRunningChanged(element, (bool)e.NewValue);
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92 | }
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93 | }
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94 | }
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95 |
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96 | UIElement indicator = LoadIndicator();
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97 |
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98 | private static UIElement LoadIndicator()
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99 | {
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100 | var resources = (ResourceDictionary)Application.LoadComponent(new Uri("/DynamicDataDisplay;component/Charts/Navigation/LongOperationsIndicatorResources.xaml", UriKind.Relative));
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101 | UIElement indicator = (UIElement)resources["Indicator"];
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102 | return indicator;
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103 | }
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104 |
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105 | private readonly DispatcherTimer timer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(100) };
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106 | private int operationsCounter = 0;
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107 | private void OnLongOperationRunningChanged(IPlotterElement element, bool longOperationRunning)
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108 | {
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109 | int change = longOperationRunning ? +1 : -1;
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110 | operationsCounter += change;
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111 |
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112 | if (plotter == null) return;
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113 |
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114 | if (operationsCounter == 1)
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115 | {
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116 | timer.Start();
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117 | }
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118 | else if (operationsCounter == 0)
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119 | {
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120 | timer.Stop();
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121 | UpdateWaitIndicator();
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122 | }
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123 | }
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124 |
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125 | private void UpdateWaitIndicator()
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126 | {
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127 | if (operationsCounter == 1)
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128 | {
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129 | if (!plotter.MainCanvas.Children.Contains(indicator))
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130 | {
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131 | plotter.MainCanvas.Children.Add(indicator);
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132 | }
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133 | plotter.Cursor = Cursors.Wait;
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134 | }
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135 | else if (operationsCounter == 0)
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136 | {
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137 | plotter.MainCanvas.Children.Remove(indicator);
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138 | plotter.ClearValue(Plotter.CursorProperty);
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139 | }
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140 | }
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141 |
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142 | #endregion // end of LongOperationRunning
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143 | }
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144 | }
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