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Revision as of 19:33, 16 December 2013 by saramgsilva (Talk | contribs)

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Como usar Cimbalino Windows Phone Toolkit Media Library - ScreenshotService

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Este artigo mostra como usar o Cimbalino Windows Phone Toolkit Media Library - ScreenshotService.

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Article Metadata
Code Example
Source file: Exemplo ScreenshotService(github)
Tested with
SDK: Windows Phone 8.0 SDK, Windows Phone 7.1.1 SDK
Devices(s): Nokia Lumia 800, Nokia Lumia 920, Lumia 925
CompatibilityPlatform Security
Capabilities: ID_CAP_MEDIALIB_PHOTO
Article
Translated:
By saramgsilva
Last edited: saramgsilva (16 Dec 2013)

Contents

Introdução

Cimbalino Windows Phone Toolkit é um conjunto de itens uteis e poderosos para ajudar na implementação de aplicações Windows Phone. Projeto base do toolkit contendo serviços para implementação do padrão de MVVM, conversores, classes auxiliares, métodos de extensões;

  • Cimbalino.Phone.Toolkit.MediaLibrary - Projeto do toolkit contendo serviços para implementação do padrão de MVVM com acesso à biblioteca de imagens, músicas e vídeos.

IScreenshotService- Representa a interface do servilço com a capacidade de tirar "screenshots". A implementação é ScreenshotService.

Note.pngNote: é preciso definir a capacidade ID_CAP_MEDIALIB_PHOTO no ficheiro manifest.

Contruindo o exemplo

O código fonte pode ser obtido em Exemplo ScreenshotService(github).

Os pacotes estão disponíveis em Nuget Package Manager (para ambos os "targets") e podem ser instalados, para mais detalhes consultar: Como instalar os pacotes Cimbalino Windows Phone Toolkit. O exemplo deste artigo usa MVVM Light para ajudar na implementação do padrão MVVM, para mais detalhes consultar:

Registando os serviços

Devemos começar por registar cada serviço no ViewModelLocator, como podemos ver de seguida:

  1.    using Cimbalino.Phone.Toolkit.Services;
  2.     using GalaSoft.MvvmLight;
  3.     using GalaSoft.MvvmLight.Ioc;
  4.     using Microsoft.Practices.ServiceLocation;
  5.  
  6.     /// This class contains static references to all the view models in the
  7.     /// application and provides an entry point for the bindings.
  8.     public class ViewModelLocator
  9.     {
  10.         /// Initializes a new instance of the ViewModelLocator class.
  11.         public ViewModelLocator()
  12.         {
  13.             ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);
  14.             if (!SimpleIoc.Default.IsRegistered<IScreenshotService>())
  15.             {
  16.                 SimpleIoc.Default.Register<IScreenshotService, ScreenshotService>();
  17.             }
  18.             SimpleIoc.Default.Register<MainViewModel>();
  19.         }
  20.  
  21.         /// Gets the main view model.
  22.         public MainViewModel MainViewModel
  23.         {
  24.             get
  25.             {
  26.                 return ServiceLocator.Current.GetInstance<MainViewModel>();
  27.             }
  28.         }
  29.  
  30.         public static void Cleanup()
  31.         {
  32.             // TODO Clear the ViewModels
  33.             var viewModelLocator = (ViewModelLocator)App.Current.Resources["Locator"];
  34.             viewModelLocator.MainViewModel.Cleanup();
  35.         }
  36.     }


Implementando a ViewModel

Em seguinda devemos implementar o MainViewModel, como podemos ver de seguida:

  1.     using System.Windows;
  2.     using System.Windows.Input;
  3.     using System.Windows.Threading;
  4.  
  5.     using Cimbalino.Phone.Toolkit.Services;
  6.  
  7.     using GalaSoft.MvvmLight.Command;
  8.     using GalaSoft.MvvmLight;
  9.  
  10.     /// This class contains properties that the main View can data bind to.
  11.     public class MainViewModel : ViewModelBase
  12.     {
  13.         /// The screenshot service
  14.         private readonly IScreenshotService _screenshotService;
  15.  
  16.         /// Initializes a new instance of the MainViewModel class.
  17.         public MainViewModel(IScreenshotService screenshotService)
  18.         {
  19.             _screenshotService = screenshotService;
  20.             TakeScreenshotCommand = new RelayCommand(TakeScreenshot);
  21.         }
  22.  
  23.         /// Gets the take screenshot command.
  24.         public ICommand TakeScreenshotCommand { get; private set; }
  25.  
  26.         /// Command to take screenshot.
  27.         private void TakeScreenshot()
  28.         {
  29.             _screenshotService.TakeScreenshot("CimbalinoScreenshot");
  30.         }
  31.     }

Implementando a View

A MainPage.xaml será algo do género:

  1. <phone:PhoneApplicationPage x:Class="CimbalinoSample.MainPage"
  2.                             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  3.                             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  4.                             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
  5.                             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
  6.                             xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
  7.                             xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
  8.                             DataContext="{Binding MainViewModel,
  9.                                                   Source={StaticResource Locator}}"
  10.                             FontFamily="{StaticResource PhoneFontFamilyNormal}"
  11.                             FontSize="{StaticResource PhoneFontSizeNormal}"
  12.                             Foreground="{StaticResource PhoneForegroundBrush}"
  13.                             Orientation="Portrait"
  14.                             SupportedOrientations="Portrait"
  15.                             shell:SystemTray.IsVisible="True"
  16.                             mc:Ignorable="d">
  17.  
  18.     <!--  LayoutRoot is the root grid where all page content is placed  -->
  19.     <Grid x:Name="LayoutRoot" Background="Transparent">
  20.         <Grid.RowDefinitions>
  21.             <RowDefinition Height="Auto" />
  22.             <RowDefinition Height="*" />
  23.         </Grid.RowDefinitions>
  24.  
  25.         <!--  TitlePanel contains the name of the application and page title  -->
  26.         <StackPanel x:Name="TitlePanel"
  27.                     Grid.Row="0"
  28.                     Margin="12,17,0,28">
  29.             <TextBlock Margin="12,0"
  30.                        Style="{StaticResource PhoneTextTitle2Style}"
  31.                        Text="Cimbalino Sample" />
  32.             <TextBlock Margin="9,-7,0,0"
  33.                        Style="{StaticResource PhoneTextTitle2Style}"
  34.                        Text="ScreenshotService" />
  35.         </StackPanel>
  36.  
  37.         <!--  ContentPanel - place additional content here  -->
  38.         <Grid x:Name="ContentPanel"
  39.               Grid.Row="1"
  40.               Margin="12,0,12,0">
  41.             <TextBlock TextWrapping="Wrap">This samples has the goal to show how to use Cimbalino Windows Phone Toolkit Media Library - ScreenshotService</TextBlock>
  42.  
  43.             <Button Margin="0,219,0,293"
  44.                     Command="{Binding TakeScreenshotCommand}"
  45.                     Content="Take Screenshot" />
  46.         </Grid>
  47.     </Grid>
  48. </phone:PhoneApplicationPage>
This page was last modified on 16 December 2013, at 19:33.
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