Take screenshot

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 // Copyright 2018 Esri. // // Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. // You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific // language governing permissions and limitations under the License.  using Esri.ArcGISRuntime.Mapping; using Esri.ArcGISRuntime.UI; using Esri.ArcGISRuntime.UI.Controls; using System; using System.Threading; using System.Threading.Tasks; using System.Windows;  namespace ArcGIS.WPF.Samples.TakeScreenshot {  [ArcGIS.Samples.Shared.Attributes.Sample(  name: "Take screenshot",  category: "MapView",  description: "Take a screenshot of the map.",  instructions: "Pan and zoom to find an interesting location, then use the button to take a screenshot. The screenshot will be displayed. Note that there may be a small delay if the map is still rendering when you push the button.",  tags: new[] { "capture", "export", "image", "print", "screen capture", "screenshot", "share", "shot" })]  public partial class TakeScreenshot  {  public TakeScreenshot()  {  InitializeComponent();  Initialize();  }   private void Initialize()  {  // Show an imagery basemap.  MyMapView.Map = new Map(BasemapStyle.ArcGISImageryStandard);  }   private async void OnScreenshotButtonClicked(object sender, RoutedEventArgs e)  {  try  {  // Wait for rendering to finish before taking the screenshot.  await WaitForRenderCompleteAsync(MyMapView);   // Export the image from MapView.  RuntimeImage image = await MyMapView.ExportImageAsync();   // Display the image in the UI.  ImageView.Source = await image.ToImageSourceAsync();   // Make the image visible.  ImageView.Visibility = Visibility.Visible;  }  catch (Exception ex)  {  MessageBox.Show(ex.ToString(), "Error");  }  }   private static Task WaitForRenderCompleteAsync(MapView mapview)  {  // The task completion source manages the task, including marking it as finished when the time comes.  TaskCompletionSource<object> tcs = new TaskCompletionSource<object>();   // If the map is currently finished drawing, set the result immediately.  if (mapview.DrawStatus == DrawStatus.Completed)  {  tcs.SetResult(null);  }  // Otherwise, configure a callback and a timeout to either set the result when  // the map is finished drawing or set the result after 2000 ms.  else  {  // Define a cancellation token source for 2000 ms.  const int timeoutMs = 2000;  var ct = new CancellationTokenSource(timeoutMs);   // Register the callback that sets the task result after 2000 ms.  ct.Token.Register(() =>  tcs.TrySetResult(null), false);   // Define a local function that will set the task result and unregister itself when the map finishes drawing.  void DrawCompleteHandler(object s, DrawStatusChangedEventArgs e)  {  if (e.Status == DrawStatus.Completed)  {  mapview.DrawStatusChanged -= DrawCompleteHandler;  tcs.TrySetResult(null);  }  }   // Register the draw complete event handler.  mapview.DrawStatusChanged += DrawCompleteHandler;  }   // Return the task.  return tcs.Task;  }  } }