/// <summary>
/// Start the QR-scan page (ZXing library). Will add the scan result to history and execute the Javascript-function on the webpage.
/// </summary>
public void StartScan()
{
//////////////// TEST
CustomScanPage customPage = new CustomScanPage();
customPage.Disappearing += (s, e) =>
{
ZXing.Result result = customPage.result;
if (result != null)
{
ScanHistory.Add(result.Text);
InjectJSQRCode(result.Text);
if (Parameters.Options.UseLocation)
{
OpenJSFunctionLocation();
}
}
Parameters.TemporaryOptions.ResetOptions();
};
if (Parameters.Options.UseLocation)
{
QRLocation.InitLocation();
}
NavigateTo(customPage);
//await App.Current.MainPage.Navigation.PushModalAsync(customPage);
}
public void LoadMainPage(bool baseInit = true)
{
if (baseInit)
{
Language.SetLanguage(Parameters.Options.LanguageIndex); // set language for the app from options
QRPage = new QRMainPage();
}
else
{
QRScanner = new Scanner(); // initialize scanner class (ZXing scanner)
ScanHistory = new History();
if (Parameters.Options.UseLocation)
{
QRLocation.InitLocation();
}
QRPage.Initialize();
}
}
/// <summary>
/// Back button was pressed. If a option was changed, all parameters will be saved.
/// </summary>
/// <returns>true to override the functionality of the default handler.</returns>
/// <remarks>
/// This works on Windows Phones and Android with the back buttons.
/// Under Windows the "back button" must be set as visible (UWP main app).
/// Under iOS a back button must be placed manually somewhere.
/// </remarks>
protected override bool OnBackButtonPressed()
{
if (saveSettings)
{
if (!Parameters.Options.UseLocation && sendLocationSwitch.IsToggled)
{
QRLocation.InitLocation();
}
Parameters.Options.HomePage = webPageValue.Text;
Parameters.Options.Emulation = emulationPicker.SelectedIndex;
Parameters.Options.AcceptBarcode_Code = acceptedCodesSwitch[1].IsToggled;
Parameters.Options.AcceptBarcode_Ean = acceptedCodesSwitch[2].IsToggled;
Parameters.Options.AcceptBarcode_Upc = acceptedCodesSwitch[3].IsToggled;
Parameters.Options.LockPortrait = lockPortraitSwitch.IsToggled;
Parameters.Options.SaveHistory = saveHistorySwitch.IsToggled;
Parameters.Options.LanguageIndex = languagePicker.SelectedIndex;
Parameters.Options.UseLocation = sendLocationSwitch.IsToggled;
}
this.Navigation.PopModalAsync(); // close this page and return the the preview page (main page)
return(true);
}
/// <summary>
/// Constructor. Will initialize the view (for Xamarin), load the parameters and initialize the QR-scanner.
/// </summary>
public App()
{
Instance = this;
QRScanner = new Scanner(); // initialize scanner class (ZXing scanner)
Parameters.LoadHistory(ref History); // load scan results history
if (Parameters.Options.UseLocation)
{
QRLocation.InitLocation();
}
if (!Parameters.Options.SaveHistory)
{
History.Clear(); // clear history if no history should be used
}
Language.SetLanguage(Parameters.Options.LanguageIndex); // set language for the app from options
// create top-bar buttons
InitButtons();
// create webView for the page
WebPageWebView = new WebView
{
Source = new UrlWebViewSource
{
Url = Parameters.Options.HomePage,
},
VerticalOptions = LayoutOptions.FillAndExpand
};
WebPageWebView.Navigating += (sender, /*WebNavigatingEventArgs*/ e) =>
{
// catch the pressed link. If link is a valid app protocol (qr2web, barcodereader, ...) start QR scanner
if (Scanner.IsAppURL(e.Url))
{
e.Cancel = true;
StartScanFromWeb(e.Url.ToString());
}
};
WebPageWebView.SizeChanged += (s, e) =>
{
if (TitleStack.Children.Count == 1)
{
lastWindowUpdate = DateTime.Now;
}
else
{
if ((DateTime.Now - lastWindowUpdate).TotalSeconds > 2)
{
while (TitleStack.Children.Count > 1)
{
TitleStack.Children.RemoveAt(1);
}
lastWindowUpdate = DateTime.Now;
}
}
if (WebPageWebView.Bounds.Width > 200)
{
TitleStack.Children.Add(ScanButton);
}
if (WebPageWebView.Bounds.Width > 400)
{
TitleStack.Children.Add(HomeButton);
}
if (WebPageWebView.Bounds.Width > 500)
{
TitleStack.Children.Add(RefreshButton);
}
if (WebPageWebView.Bounds.Width > 300)
{
TitleStack.Children.Add(HistoryButton);
}
if (WebPageWebView.Bounds.Width > 600)
{
TitleStack.Children.Add(SettingsButton);
}
TitleStack.Children.Add(MoreButton);
};
TitleStack = new StackLayout
{
VerticalOptions = LayoutOptions.Fill,
HorizontalOptions = LayoutOptions.FillAndExpand,
HeightRequest = 45,
Orientation = StackOrientation.Horizontal,
Children =
{
new Label
{
Text = Language.GetText("AppTitleShort"),
HorizontalOptions = LayoutOptions.StartAndExpand,
VerticalOptions = LayoutOptions.Fill,
VerticalTextAlignment = TextAlignment.Center,
TextColor = Color.Yellow
}
}
};
// Don't show button if there is no QR-history
HistoryButton.IsVisible = Parameters.Options.SaveHistory;
// The root page of your application
MainPage = new ContentPage
{
Content = new StackLayout
{
VerticalOptions = LayoutOptions.Fill,
HorizontalOptions = LayoutOptions.Fill,
Children =
{
TitleStack,
WebPageWebView
}
},
Padding = new Thickness(0),
BackgroundColor = Color.Black,
};
NavigationPage.SetHasBackButton(MainPage, false);
NavigationPage.SetHasNavigationBar(MainPage, false);
}
