Merge pull request #29 from rebuy-de/37651_add_command_to_scan

refs #37651 add barcode command

README.md

@@ -60,6 +60,7 @@ What | Type | Description
 `BarcodeScanner.PreviewActive` | Property | If `true` the preview image gets updated. `false` no preview for you!
 `BarcodeScanner.BarcodeDecoder` | Property | If `true` the decoder is active and tries to decode barcodes out of the image. `false` turns the decoder off, the preview is still active but barcodes will not be decoded.
 
+Every event is also provided as `Command`. e.g. `BarcodeChanged` => `BarcodeChangedCommand`
 ### Configuration
 
 Configuration can be applied by passing a `RbConfig` object to the `BarcodeScannerRenderer.Init()` method. As the available options are platform specific, the configuration has to be done in the according platform solution. The corresponding [Android](Rb.Forms.Barcode.Droid/RbConfig.cs) class documentation should give you a solid understanding of the available options. 

Rb.Forms.Barcode.Pcl/BarcodeScanner.cs

@@ -3,11 +3,72 @@
 using Xamarin.Forms;
 using System.Diagnostics;
 using Rb.Forms.Barcode.Pcl.Extensions;
+using System.Windows.Input;
 
 namespace Rb.Forms.Barcode.Pcl
 {
     public class BarcodeScanner : View
-   {
+    {     
+        /// <summary>
+        /// Command property gets called only when the barcode text changes.
+        /// </summary>
+        public static BindableProperty BarcodeChangedCommandProperty = BindableProperty.Create(
+            propertyName: "BarcodeChangedCommand",
+            returnType: typeof(ICommand),
+            declaringType: typeof(BarcodeScanner),
+            defaultValue: null
+        );
+
+        /// <summary>
+        /// Command property gets called every time when a barcode is decoded from the preview, even if the value is the same as the previews one.
+        /// </summary>
+        public static BindableProperty BarcodeDecodedCommandProperty = BindableProperty.Create(
+            propertyName: "BarcodeDecodedCommand",
+            returnType: typeof(ICommand),
+            declaringType: typeof(BarcodeScanner),
+            defaultValue: null
+        );
+
+        /// <summary>
+        /// Command property gets called as soon as the surfaces starts previewing.
+        /// </summary>
+        public static BindableProperty PreviewActivatedCommandProperty = BindableProperty.Create(
+            propertyName: "PreviewActivatedCommand",
+            returnType: typeof(ICommand),
+            declaringType: typeof(BarcodeScanner),
+            defaultValue: null
+        );
+
+        /// <summary>
+        /// Command property gets called when the surfaces stops previewing.
+        /// </summary>
+        public static BindableProperty PreviewDeactivatedCommandProperty = BindableProperty.Create(
+            propertyName: "PreviewDeactivatedCommand",
+            returnType: typeof(ICommand),
+            declaringType: typeof(BarcodeScanner),
+            defaultValue: null
+        );
+
+        /// <summary>
+        /// Command property gets called after the camera was opened.
+        /// </summary>
+        public static BindableProperty CameraOpenedCommandProperty = BindableProperty.Create(
+            propertyName: "CameraOpenedCommand",
+            returnType: typeof(ICommand),
+            declaringType: typeof(BarcodeScanner),
+            defaultValue: null
+        );
+
+        /// <summary>
+        /// Command property gets called after the camera was released.
+        /// </summary>
+        public static BindableProperty CameraReleasedCommandProperty = BindableProperty.Create(
+            propertyName: "CameraReleasedCommand",
+            returnType: typeof(ICommand),
+            declaringType: typeof(BarcodeScanner),
+            defaultValue: null
+        );
+
         /// <summary>
         /// OneWay source to target binding for the current barcode.
         /// </summary>
@@ -57,6 +118,54 @@ public bool PreviewActive
                 p => p.BarcodeDecoder, true, BindingMode.TwoWay
             );
 
+        /// <summary>
+        /// Command gets called only when the barcode text changes.
+        /// </summary>
+        public ICommand BarcodeChangedCommand {
+            get { return (ICommand) GetValue(BarcodeChangedCommandProperty); }
+            set { SetValue(BarcodeChangedCommandProperty, value); }
+        }
+
+        /// <summary>
+        /// Command gets called every time when a barcode is decoded from the preview, even if the value is the same as the previews one.
+        /// </summary>
+        public ICommand BarcodeDecodedCommand {
+            get { return (ICommand) GetValue(BarcodeDecodedCommandProperty); }
+            set { SetValue(BarcodeDecodedCommandProperty, value); }
+        }
+
+        /// <summary>
+        /// Command gets called as soon as the surfaces starts previewing.
+        /// </summary>
+        public ICommand PreviewActivatedCommand {
+            get { return (ICommand) GetValue(PreviewActivatedCommandProperty); }
+            set { SetValue(PreviewActivatedCommandProperty, value); }
+        }
+
+        /// <summary>
+        /// Command gets called when the surfaces stops previewing.
+        /// </summary>
+        public ICommand PreviewDeactivatedCommand {
+            get { return (ICommand) GetValue(PreviewDeactivatedCommandProperty); }
+            set { SetValue(PreviewDeactivatedCommandProperty, value); }
+        }
+
+        /// <summary>
+        /// Command gets called after the camera was opened.
+        /// </summary>
+        public ICommand CameraOpenedCommand {
+            get { return (ICommand) GetValue(CameraOpenedCommandProperty); }
+            set { SetValue(CameraOpenedCommandProperty, value); }
+        }
+
+        /// <summary>
+        /// Command gets called after the camera was released.
+        /// </summary>
+        public ICommand CameraReleasedCommand {
+            get { return (ICommand) GetValue(CameraReleasedCommandProperty); }
+            set { SetValue(CameraReleasedCommandProperty, value); }
+        }
+
         /// <summary>
         /// Gets or controlls the decoder state.
         /// </summary>
@@ -99,36 +208,41 @@ public bool BarcodeDecoder
 
         public void OnCameraOpened()
         {
+            CameraOpenedCommand.Raise();
             CameraOpened.Raise(this, EventArgs.Empty);
         }
 
         public void OnCameraReleased()
         {
+            CameraReleasedCommand.Raise();
             CameraReleased.Raise(this, EventArgs.Empty);
         }
 
         private static void OnBarcodeChanged(BindableObject bindable, String oldValue, String newBarcode)
         {
             Debug.WriteLine("[ScannerView] OnBarcodeChanged [{0}]", newBarcode, null);
             var b = (BarcodeScanner) bindable;
-
+            b.BarcodeChangedCommand.Raise(newBarcode);
             b.BarcodeChanged.Raise(b, new BarcodeEventArgs(newBarcode));
         }
 
         private void OnBarcodeDecoded(String barcode)
         {
             Debug.WriteLine("[ScannerView] OnBarcodeDecoded [{0}]", barcode, null);
 
+            BarcodeDecodedCommand.Raise(barcode);
             BarcodeDecoded.Raise(this, new BarcodeEventArgs(barcode));
         }
 
         public void OnPreviewActivated()
         {
+            PreviewActivatedCommand.Raise();
             PreviewActivated.Raise(this, EventArgs.Empty);
         }
 
         public void OnPreviewDeactivated()
         {
+            PreviewDeactivatedCommand.Raise();
             PreviewDeactivated.Raise(this, EventArgs.Empty);
         }
     }   

Rb.Forms.Barcode.Pcl/Extensions/CommandExtension.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Windows.Input;
+
+namespace Rb.Forms.Barcode.Pcl
+{
+    public static class CommandExtension
+    {
+        public static void Raise(this ICommand comand, object parameter)
+        {
+            if (comand != null && comand.CanExecute(parameter)) {
+                comand.Execute(parameter);
+            }
+        }
+
+        public static void Raise(this ICommand comand)
+        {
+            Raise(comand, EventArgs.Empty);
+        }
+    }
+}
+

Rb.Forms.Barcode.Pcl/Rb.Forms.Barcode.Pcl.csproj

@@ -36,6 +36,7 @@
     <Compile Include="Extensions\EventExtension.cs" />
     <Compile Include="BarcodeEventArgs.cs" />
     <Compile Include="OutOfBoundsException.cs" />
+    <Compile Include="Extensions\CommandExtension.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
   <Import Project="..\packages\Xamarin.Forms.1.4.2.6355\build\portable-win+net45+wp80+win81+wpa81+MonoAndroid10+MonoTouch10+Xamarin.iOS10\Xamarin.Forms.targets" Condition="Exists('..\packages\Xamarin.Forms.1.4.2.6355\build\portable-win+net45+wp80+win81+wpa81+MonoAndroid10+MonoTouch10+Xamarin.iOS10\Xamarin.Forms.targets')" />

Rb.Forms.Barcode.nuspec

@@ -3,7 +3,7 @@
   <metadata>
     <id>Rb.Forms.Barcode</id>
     <title>Barcode scanner plugin for Xamarin.Forms</title>
-    <version>0.3.5-beta</version>
+    <version>0.4.0-beta</version>
     <authors>Ota Mares</authors>
     <owners>reBuy reCommerce GmbH</owners>
     <licenseUrl>https://github.com/rebuy-de/rb-forms-barcode/blob/master/LICENSE</licenseUrl>
@@ -14,27 +14,8 @@ Please check the website for further details.
 
 Beta notice: Currently only android is supported.</description>
     <summary>Rb.Forms.Barcode is a Xamarin.Forms view for scanning barcodes.</summary>
-    <releaseNotes>0.3.5-beta:
-* Fixed: Prevent dispose if object is null.
-
-0.3.4-beta:
-* Fixed: Surface changed does not start preview anymore.
-* Improved: Dispose all buffers.
-* Improved: Update to Xamarin.Forms to 1.4.2.6355 version.
-
-0.3.3-beta:
-* Fixed: UPC-A codes are not padded to 13 signs.
-
-0.3.2-beta:
-* Fixed: Even more oom issues.
-
-0.3.1-beta:
-* Fixed: Memory issue when restarting camera.
-
-0.3.0-beta:
-* New: Improved performance by using buffers and FastAndroidCamera.
-* New: Added plenty configuration options!
-* Fixed: Various preview halting and runtime issues.
+    <releaseNotes>0.4.0-beta:
+* New: Add every event as command
 </releaseNotes>
     <tags>barcode scanner scanning scan zxing xamarin xamarin.forms rebuy unicorns</tags>
     <dependencies>