Here's what I am currently doing in C#:
TapGestureRecognizer tap = new TapGestureRecognizer()
{
NumberOfTapsRequired = 1
};
tap.SetBinding(TapGestureRecognizer.CommandProperty, new Binding("DeckTapCommandAsync", source: GD));
tap.SetBinding(TapGestureRecognizer.CommandParameterProperty, new Binding("TapCommandParam", source: GD));
GestureRecognizers.Add(tap);
What I would like to know is if there is any way I can do this using Xamarin.Forms C# markup
https://learn.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/csharp-markup
Yes, you could use SetBinding for TapGestureRecognizer.
Using ICommand:
var tapGestureRecognizer = new TapGestureRecognizer();
tapGestureRecognizer.SetBinding (TapGestureRecognizer.CommandProperty, "TapCommand");
image.GestureRecognizers.Add(tapGestureRecognizer);
For more details, you could check the link: https://learn.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/gestures/tap#using-icommand
You could download the source file from the link: https://learn.microsoft.com/en-us/samples/xamarin/xamarin-forms-samples/workingwithgestures-tapgesture/
Or you could set with below:
// Image TRASH
TapGestureRecognizer tgrTrash = new TapGestureRecognizer();
tgrTrash.SetBinding(TapGestureRecognizer.CommandProperty, new Binding("BindingContext.TrashCommand", source: this));
tgrTrash.SetBinding(TapGestureRecognizer.CommandParameterProperty, ".");
Image imageTrash = new Image() { Source = "trash.png" };
//Label lTrash = new Label { Text = "Trash", VerticalTextAlignment = TextAlignment.Center };
imageTrash.GestureRecognizers.Add(tgrTrash);
You could download the source file from the link: https://github.com/WendyZang/TestBindingWithListView
Related
I have UWP Windows application, developed under the Xamarin.forms. I have implemented the Toast notifications but I am facing the issue with this. In some Windows 10 systems, it is working and showing the toast notification properly, but in some of the Windows 10 systems (even having the same Windows 10 OS update) it is not working.
Below first code snippets that I have implemented in the Native UWP.
string msg = "Toast Notification Header";
string subMsg = "Toast Notification Title";
var toastXml = ToastNotificationManager.GetTemplateContent(ToastTemplateType.ToastText02);
var toastTextElements = toastXml.GetElementsByTagName("text");
toastTextElements[0].AppendChild(toastXml.CreateTextNode(msg));
toastTextElements[1].AppendChild(toastXml.CreateTextNode(subMsg));
//To play the custom sound
var toastNode = toastXml.SelectSingleNode("/toast");
var audio = toastXml.CreateElement("audio");
audio.SetAttribute("src", "ms-appx:///Assets/incoming_message.wav");
audio.SetAttribute("loop", "false");
toastNode.AppendChild(audio);
var toast = new ToastNotification(toastXml);
ToastNotificationManager.CreateToastNotifier().Show(toast);
Below second code snippets that I have implemented in the Native UWP.
// "With Microsoft.Toolkit.Uwp.Notifications"
// Construct the toast content
ToastContent toastContent = new ToastContent()
{
Visual = new ToastVisual()
{
BindingGeneric = new ToastBindingGeneric()
{
Children =
{
new AdaptiveText()
{
Text = "Toast Notification Header"
},
new AdaptiveText()
{
Text = "Toast Notification Content"
}
}
}
}
};
bool supportsCustomAudio = true;
// If we're running on Desktop before Version 1511, do NOT include custom audio
// since it was not supported until Version 1511, and would result in a silent toast.
if (AnalyticsInfo.VersionInfo.DeviceFamily.Equals("Windows.Desktop")
&& !ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 2))
{
supportsCustomAudio = false;
}
if (supportsCustomAudio)
{
toastContent.Audio = new ToastAudio()
{
Src = new Uri("ms-appx:///Assets/incoming_message.wav")
};
}
// And create the toast notification
ToastNotification notification = new ToastNotification(toastContent.GetXml());
// And then send the toast
ToastNotificationManager.CreateToastNotifier().Show(notification);
Above code snips showing the Toast notification in some Windows 10 system and not working in some other Windows 10 system.
Kindly guide me on this. Thanks in advance.
Regards,
Vivek
Please follow these steps to add toast notification in UWP Project.
Step 1:- Create a new UWP project.
Step 2:- Go to the code-behind and add the namespace.
using Windows.UI.Notifications;
using
NotificationsExtensions.Toasts;
Step 3:- I created a Toast Generic Template like the following code:
public static Windows.Data.Xml.Dom.XmlDocument CreateToast()
{
var xDoc = new XDocument(
new XElement("toast",
new XElement("visual",
new XElement("binding", new XAttribute("template", "ToastGeneric"),
new XElement("text", "C# Corner"),
new XElement("text", "Do you got MVP award?")
)
),// actions
new XElement("actions",
new XElement("action", new XAttribute("activationType", "background"),
new XAttribute("content", "Yes"), new XAttribute("arguments", "yes")),
new XElement("action", new XAttribute("activationType", "background"),
new XAttribute("content", "No"), new XAttribute("arguments", "no"))
)
)
);
var xmlDoc = new Windows.Data.Xml.Dom.XmlDocument();
xmlDoc.LoadXml(xDoc.ToString());
return xmlDoc;
}
Step 4:- Create a toast notification object using XML document.
var xmdock = CreateToast();
var toast = new ToastNotification(xmdock);
Next show the toast using ToastNotificationManager class.
var notifi = Windows.UI.Notifications.ToastNotificationManager.CreateToastNotifier();
notifi.Show(toast);
Step 5:- C# code-behind:
private void showToastBtn_Click(object sender, RoutedEventArgs e)
{
var xmdock = CreateToast();
var toast = new ToastNotification(xmdock);
var notifi = Windows.UI.Notifications.ToastNotificationManager.CreateToastNotifier();
notifi.Show(toast);
}
I hope the above code will be useful for you.
Thank you
UPDATE:
I've tried implementing this in an App.cs method called OpenCameraScanner (you would call this on click of a button on the page from which you want to scan):
App.cs
------------------------------------------------
public static ZXingScannerPage ScanPage;
public static ZXing.Result ScanResult;
public static async void OpenCameraScanner()
{
ScanPage = new ZXingScannerPage(customOverlay: customOverlay);
ScanPage.OnScanResult += (result) =>
{
ScanPage.IsScanning = false;
ScanResult = result;
Device.BeginInvokeOnMainThread(() =>
{
App.CurrentApp.CurrentPage.Navigation.PopModalAsync();
App.CurrentApp.CurrentPage.DisplayAlert("Scanned Barcode", result.Text, "OK");
});
};
var scanPage = new NavigationPage(ScanPage);
await App.CurrentApp.CurrentPage.Navigation.PushModalAsync(ScanPage);
}
However, when this method is called, the screen that opens is blank white, and you can't see the camera view behind it. Not sure why?
I'm using ZXing.Mobile in a Xamarin.Forms project (for iOS right now) for camera scanning functionality on an iPad.
Currently, I have it working great with the following 2 lines:
var scanner = new ZXing.Mobile.MobileBarcodeScanner();
var result = await scanner.Scan();
However, when the camera is open to scan, it takes up the entire iPad screen, which is really big.
Question: Is there a way to adjust the size of the camera overlay? (so that it's not full screen)
I see that the scanner.Scan() method takes an optional options parameter of type ZXing.Mobile.MobileBarcodeScanningOptions - I tried playing around with that, but the only possible relevant option there is a CameraResolutionSelector - but I'm having a really hard time finding any documentation on that.
There is a ZXing sample app that shows how to embed the ZXingScannerView and ZXingDefaultOverlay into a Xamarin.Form's Grid:
https://github.com/Redth/ZXing.Net.Mobile/blob/master/Samples/Forms/Core/CustomScanPage.cs
public CustomScanPage () : base ()
{
zxing = new ZXingScannerView
{
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand,
AutomationId = "zxingScannerView",
};
zxing.OnScanResult += (result) =>
Device.BeginInvokeOnMainThread (async () => {
// Stop analysis until we navigate away so we don't keep reading barcodes
zxing.IsAnalyzing = false;
// Show an alert
await DisplayAlert ("Scanned Barcode", result.Text, "OK");
// Navigate away
await Navigation.PopAsync ();
});
overlay = new ZXingDefaultOverlay
{
TopText = "Hold your phone up to the barcode",
BottomText = "Scanning will happen automatically",
ShowFlashButton = zxing.HasTorch,
AutomationId = "zxingDefaultOverlay",
};
overlay.FlashButtonClicked += (sender, e) => {
zxing.IsTorchOn = !zxing.IsTorchOn;
};
var grid = new Grid
{
VerticalOptions = LayoutOptions.FillAndExpand,
HorizontalOptions = LayoutOptions.FillAndExpand,
};
grid.Children.Add(zxing);
grid.Children.Add(overlay);
// The root page of your application
Content = grid;
}
There is still something i don't get in accessing native Platform stuff with nativescript. Here is a simple snippet where i try to access a native gui element and add it to a page:
var PagesModule = require('ui/page');
var Application = require('application');
var StackLayout = require('ui/layouts/stack-layout').StackLayout;
exports.createPage = function createPage(args) {
var page = new PagesModule.Page;
page.actionBarHidden = true;
page.backgroundColor = '#F5F5F5';
page.backgroundSpanUnderStatusBar = false;
var textView = new android.widget.TextView(Application.android.currentContext);
var stackLayout = new StackLayout();
stackLayout.addChild(textView);
page.content = stackLayout;
return page;
}
I think i am missing something in the understanding of how nativescript interacts with the native platform.
The reason it is failing is because only "view" or "view" descendants can be assigned to "view" child or children.
You are creating a direct android component; but it isn't part of the NS framework, so the framework doesn't know what to do with it. When you create a visual component you descend your component from a view (or another view descendant). The NS version of the code should be:
var PagesModule = require('ui/page');
var Application = require('application');
var StackLayout = require('ui/layouts/stack-layout').StackLayout;
vat TextView = require('ui/text-view').TextView;
exports.createPage = function createPage(args) {
var page = new PagesModule.Page;
page.actionBarHidden = true;
page.backgroundColor = '#F5F5F5';
page.backgroundSpanUnderStatusBar = false;
var textView = new TextView();
var stackLayout = new StackLayout();
stackLayout.addChild(textView);
page.content = stackLayout;
return page;
}
If you are actually wanting to create your own component I would recommend you look at the UI/Switch it is probably the simplest example; but in a nutshell you need to subclass the view, on Android use the function _createUI to actually create the native component, and so in simplest terms it would be:
var View = require('ui/core/view').View;
function MyTextView() {
View.apply(this, arguments);
}
__extends(MyTextView, View);
Object.defineProperty(MyTextView.prototype, "android", {
get: function () {
return this._android;
},
enumerable: true,
configurable: true
});
MyTextView.prototype._createUI = function () {
this._android = new android.widget.TextView(Application.android.currentContext);
};
Then you can use new MyTextView() instead of the built in new TextView() function in the first code sample.
Please note with this component, because we haven't defined any additional helper function, to set and get the text you would have to do things like
var x = page.GetViewById('myTextId').android.setText("Some Value");
and to access the native underlying control and its android properties.
Please note I have a whole blog article on some of this at http://fluentreports.com/blog/?p=167 (And many other articles on the site about NS)
I've been doing a essay about map on windows phone. I added pushpins default into map and its content is a image. I want to show information when I tap or click on pushpin, but I don't know what to do. I've just thought about use tooltip to show info, but I can't do it.
here is my createpushpin function.
can you help me? thank you for all kind of you!
private void CreateNewPushpin(object selectedItem)
{
var pushpinPrototype = selectedItem as Pushpinsmodel;
var pushpinicon = pushpinPrototype.Icon;
Pushpin pushpins = new Pushpin() { Tag = adress.Name };
pushpins.Background = new SolidColorBrush(Colors.Green);
pushpins.Location = new GeoCoordinate(lad, long);
ImageBrush image = new ImageBrush() {
ImageSource = new System.Windows.Media.Imaging.BitmapImage
(pushpinicon)};
Ellipse elip = new Ellipse()
{
Fill = image,
Name = adress.Name,
StrokeThickness = 10,
Height = 30,
Width = 30
};
pushpins.Content = elip;
var tooltipText = new ToolTip { Content = adress.Name};
ToolTipService.SetToolTip(pushpins, tooltipText);
map1.Children.Add(pushpins);
listpushpin.Add(pushpins);
this.map1.SetView(pushpins.Location, 18.0);
}
I have a little question, I want to change the background of my application with C#.
I tried this code :
var app = Application.Current as App;
var imageBrush = new ImageBrush
{
ImageSource = new BitmapImage(new Uri(imageName, UriKind.Relative))
};
app.RootFrame.Background = imageBrush;
But it doesn't work, the background is dark.. I tried to do :
app.RootFrame.Background = new SolidColorBrush(Colors.Blue);
And it works well. So I don't understand where is the problem, my image is 480*800 px and I set Build Action to Content and Copy to Output Directory to Copy if newer .
Thanks for all
maybe you can try it
var app = Application.Current as App;
if (app == null)
return;
var imageBrush = new ImageBrush
{
};
var uu = new BitmapImage(new Uri(imageName, UriKind.Relative));
uu.CreateOptions = BitmapCreateOptions.None;
imageBrush.ImageSource = uu;
app.RootFrame.Background = imageBrush;
Mark: uu.CreateOptions = BitmapCreateOptions.None;
I'm doing almost the exact same thing successfully with an image, except I'm setting the image as the background to a panorama control. I know someone else had the same problem you did in this post so I suggested setting the background of the LayoutRoot or other control instead of the app.RootFrame.
Thank you both !!
I had previously tried the two solutions separately and it didn't work. But together it works perfectly!
The code :
var imageBrush = new ImageBrush
{
};
var uu = new BitmapImage(new Uri("/Images/image.png", UriKind.Relative));
uu.CreateOptions = BitmapCreateOptions.None;
imageBrush.ImageSource = uu;
LayoutRoot.Background = imageBrush;