I am trying to write a custom renderer for a Xamarin Map on UWP and a collection change event in the PCL is not triggering the appropriate event in the UWP custom renderer. It works just fine on iOS and Android.
With the following code the event ItemsCollectionChanged never gets called in the CustomMapRenderer even through the OnItemsSourcePropertyChanged is being called every 5 seconds.
public class CustomMap : Map
{
#region << Events >>
public event EventHandler ItemsCollectionChanged;
#endregion
private static void OnItemsSourcePropertyChanged(BindableObject bindable, object oldValue, object newValue)
{
var map = bindable as CustomMap;
if (map == null)
return;
map.ItemsSource.CollectionChanged += (s, e) =>
{
SetPin(bindable);
if (map.ItemsCollectionChanged != null)
{
map.ItemsCollectionChanged(bindable, new EventArgs());
}
};
}
}
[assembly: ExportRenderer(typeof(CustomMap), typeof(CustomMapRenderer))]
Namespace MyNamespace.Renderers
{
public class CustomMapRenderer : MapRenderer
{
MapControl _nativeMap;
protected override void OnElementChanged(ElementChangedEventArgs<Map> e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
{
_nativeMap.MapElementClick -= OnMapElementClick;
_nativeMap.Children.Clear();
_nativeMap = null;
}
if (e.NewElement != null)
{
var formsMap = (CustomMap)e.NewElement;
formsMap.ItemsCollectionChanged += ItemsCollectionChanged;
_pinClickedCommand = formsMap.PinClickedCommand;
_routeCoordinates = formsMap.ItemsSource;
_nativeMap = Control as MapControl;
_nativeMap.Children.Clear();
_nativeMap.MapElementClick += OnMapElementClick;
var snPosition = new BasicGeoposition { Latitude = 45, Longitude = -88 };
Geopoint snPoint = new Geopoint(snPosition);
var mapIcon = new MapIcon();
if (mapIcon != null)
{
_nativeMap.MapElements.Remove(mapIcon);
}
mapIcon.CollisionBehaviorDesired = MapElementCollisionBehavior.RemainVisible;
mapIcon.Location = snPoint;
mapIcon.NormalizedAnchorPoint = new Windows.Foundation.Point(0.5, 1.0);
_nativeMap.MapElements.Add(mapIcon);
_nativeMap.Center = snPoint;
}
}
void ItemsCollectionChanged(object sender, EventArgs e)
{
;
}
}
}
I used a singleton to get the observable collection that I needed
Related
This post is continuation of this topic
I need find equivalent method Xamarin.Forms.Maps.iOS.MapRenderer.GetViewForAnnotation for CustomMapRenderer for Android.
As for this documentation the GetViewForAnnotation method for iOS is called when the location of the annotation becomes visible on the map, and is used to customize the annotation prior to display.
I need to find equivalent because I want to show pins on my map with already expanded window message(without click on them).
You could show the InfoWindow directly after you get the marker from your custom pin.
Add the code below when you override the CreateMarker method.
NativeMap.AddMarker(marker).ShowInfoWindow();
The whold custom renderer of Android:
public class CustomMapRenderer : MapRenderer, GoogleMap.IInfoWindowAdapter
{
List<CustomPin> customPins;
public CustomMapRenderer(Context context) : base(context)
{
}
protected override void OnElementChanged(ElementChangedEventArgs<Map> e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
{
NativeMap.InfoWindowClick -= OnInfoWindowClick;
}
if (e.NewElement != null)
{
var formsMap = (CustomMap)e.NewElement;
customPins = formsMap.CustomPins;
}
}
protected override void OnMapReady(GoogleMap map)
{
base.OnMapReady(map);
NativeMap.InfoWindowClick += OnInfoWindowClick;
NativeMap.SetInfoWindowAdapter(this);
}
protected override MarkerOptions CreateMarker(Pin pin)
{
var marker = new MarkerOptions();
marker.SetPosition(new LatLng(pin.Position.Latitude, pin.Position.Longitude));
marker.SetTitle(pin.Label);
marker.SetSnippet(pin.Address);
marker.SetIcon(BitmapDescriptorFactory.FromResource(Resource.Drawable.pin));
NativeMap.AddMarker(marker).ShowInfoWindow();
return marker;
}
private void OnInfoWindowClick(object sender, GoogleMap.InfoWindowClickEventArgs e)
{
var customPin = GetCustomPin(e.Marker);
if (customPin == null)
{
throw new Exception("Custom pin not found");
}
if (!string.IsNullOrWhiteSpace(customPin.Url))
{
var url = Android.Net.Uri.Parse(customPin.Url);
var intent = new Intent(Intent.ActionView, url);
intent.AddFlags(ActivityFlags.NewTask);
Android.App.Application.Context.StartActivity(intent);
}
}
CustomPin GetCustomPin(Marker annotation)
{
var position = new Position(annotation.Position.Latitude, annotation.Position.Longitude);
foreach (var pin in customPins)
{
if (pin.Position == position)
{
return pin;
}
}
return null;
}
public Android.Views.View GetInfoContents(Marker marker)
{
var inflater = Android.App.Application.Context.GetSystemService(Context.LayoutInflaterService) as Android.Views.LayoutInflater;
if (inflater != null)
{
Android.Views.View view;
var customPin = GetCustomPin(marker);
if (customPin == null)
{
throw new Exception("Custom pin not found");
}
if (customPin.Name.Equals("Xamarin"))
{
view = inflater.Inflate(Resource.Layout.XamarinMapInfoWindow, null);
}
else
{
view = inflater.Inflate(Resource.Layout.MapInfoWindow, null);
}
var infoTitle = view.FindViewById<TextView>(Resource.Id.InfoWindowTitle);
var infoSubtitle = view.FindViewById<TextView>(Resource.Id.InfoWindowSubtitle);
if (infoTitle != null)
{
infoTitle.Text = marker.Title;
}
if (infoSubtitle != null)
{
infoSubtitle.Text = marker.Snippet;
}
return view;
}
return null;
}
public Android.Views.View GetInfoWindow(Marker marker)
{
return null;
}
}
For more details, you could refer to the MS docs.
https://learn.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/custom-renderer/map-pin
I am trying to Customise the look of AutoCompleteTextView i need a rounded Entry
till now i have tried this
[assembly: ExportRenderer(typeof(AutoCompleteViewv3),
typeof(AutoCompleteViewRendererv3))]
namespace PredictiveList.Droid
{
public class AutoCompleteViewRendererv3 : ViewRenderer<AutoCompleteViewv3,
AutoCompleteTextView>
{
static string[] COUNTRIES = new string[] {
"Afghanistan", "Albania", "Algeria", "American Samoa", "Andorra",
"Angola", "Anguilla", "Antarctica", "Antigua and Barbuda", };
public AutoCompleteViewRendererv3(Android.Content.Context context) : base(context)
{
}
protected override void OnElementChanged(ElementChangedEventArgs<AutoCompleteViewv3> e)
{
base.OnElementChanged(e);
if (e.OldElement != null || this.Element == null)
return;
// var textInputLayout = (TextInputLayout)LayoutInflater.From(Context).Inflate(Resource.Layout.TextInputLayout, null);
var autoComplete = new AutoCompleteTextView(Context);
autoComplete.SetBackgroundResource(Resource.Drawable.rounded_cornersrev);
//var autoCompleteTextView = (AutoCompleteTextView)LayoutInflater.From(Context).Inflate(Resource.Layout.TextInputLayout, null);
//var txtSearch = (AutoCompleteTextView)FindViewById(Resource.Id.autocomplete_country);
// TextView name = (TextView)Android.Views.View.FindViewById(Resource.Id.txt_searchhh);
AutoCompleteTextView textView = new AutoCompleteTextView(Context);
textView = FindViewById<AutoCompleteTextView>(Resource.Id.autocomplete_country);
var adapter = new ArrayAdapter<String>(Context, Resource.Layout.list_item, COUNTRIES);
autoComplete.Adapter = adapter;
SetNativeControl(autoComplete);
}
// Use the control here.
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (this.Element == null || this.Control == null)
return;
// variable this.Control is the AutoCompleteTextView, so you an manipulate it.
}
}
}
i am trying to implement this in Xamarin Forms if someone have some other idea please do suggest
also please help me how can i remove understroke of entry
Have a try this way:
AutoCompleteTextView textView = new AutoCompleteTextView(textView =FindViewById<AutoCompleteTextView>(Resource.Id.autocomplete_country);
textView.Background = null; // Set background be null
I want to customize my picker. I created a custom renderer for my picker but I dont know how the customization settings. How can I change the font style and size of the item? and How can I remove the two lines?
public class CustomPickerRenderer : PickerRenderer
{
public CustomPickerRenderer(Context context) : base(context)
{
AutoPackage = false;
}
protected override void OnElementChanged(ElementChangedEventArgs<Picker> e)
{
base.OnElementChanged(e);
if (e.OldElement == null)
{
Control.Background = null;
var layoutParams = new MarginLayoutParams(Control.LayoutParameters);
layoutParams.SetMargins(0, 0, 0, 0);
Control.LayoutParameters = layoutParams;
Control.SetPadding(0, 0, 0, 0);
SetPadding(0, 0, 0, 0);
}
}
}
If you want to set the fontSize of the text , you first need to customize a subclass extends from NumberPicker and overwrite the method AddView.
public class TextColorNumberPicker: NumberPicker
{
public TextColorNumberPicker(Context context) : base(context)
{
}
public override void AddView(View child, int index, ViewGroup.LayoutParams #params)
{
base.AddView(child, index, #params);
UpdateView(child);
}
public void UpdateView(View view)
{
if ( view is EditText ) {
//set the font of text
((EditText)view).TextSize = 8;
}
}
}
If you want to remove the lines,you should rewrite the NumberPicker
in Android Custom Renderer
public class MyAndroidPicker:PickerRenderer
{
IElementController ElementController => Element as IElementController;
public MyAndroidPicker()
{
}
private AlertDialog _dialog;
protected override void OnElementChanged(ElementChangedEventArgs<Picker> e)
{
base.OnElementChanged(e);
if (e.NewElement == null || e.OldElement != null)
return;
Control.Click += Control_Click;
}
protected override void Dispose(bool disposing)
{
Control.Click -= Control_Click;
base.Dispose(disposing);
}
private void SetPickerDividerColor(TextColorNumberPicker picker)
{
Field[] fields = picker.Class.GetDeclaredFields();
foreach (Field pf in fields)
{
if(pf.Name.Equals("mSelectionDivider"))
{
pf.Accessible = true;
// set the color as transparent
pf.Set(picker, new ColorDrawable(this.Resources.GetColor(Android.Resource.Color.Transparent)));
}
}
}
private void Control_Click(object sender, EventArgs e)
{
Picker model = Element;
var picker = new TextColorNumberPicker(Context);
if (model.Items != null && model.Items.Any())
{
picker.MaxValue = model.Items.Count - 1;
picker.MinValue = 0;
picker.SetBackgroundColor(Android.Graphics.Color.Yellow);
picker.SetDisplayedValues(model.Items.ToArray());
//call the method after you setting DisplayedValues
SetPickerDividerColor(picker);
picker.WrapSelectorWheel = false;
picker.Value = model.SelectedIndex;
}
var layout = new LinearLayout(Context) { Orientation = Orientation.Vertical };
layout.AddView(picker);
ElementController.SetValueFromRenderer(VisualElement.IsFocusedProperty, true);
var builder = new AlertDialog.Builder(Context);
builder.SetView(layout);
builder.SetTitle(model.Title ?? "");
builder.SetNegativeButton("Cancel ", (s, a) =>
{
ElementController.SetValueFromRenderer(VisualElement.IsFocusedProperty, false);
// It is possible for the Content of the Page to be changed when Focus is changed.
// In this case, we'll lose our Control.
Control?.ClearFocus();
_dialog = null;
});
builder.SetPositiveButton("Ok ", (s, a) =>
{
ElementController.SetValueFromRenderer(Picker.SelectedIndexProperty, picker.Value);
// It is possible for the Content of the Page to be changed on SelectedIndexChanged.
// In this case, the Element & Control will no longer exist.
if (Element != null)
{
if (model.Items.Count > 0 && Element.SelectedIndex >= 0)
Control.Text = model.Items[Element.SelectedIndex];
ElementController.SetValueFromRenderer(VisualElement.IsFocusedProperty, false);
// It is also possible for the Content of the Page to be changed when Focus is changed.
// In this case, we'll lose our Control.
Control?.ClearFocus();
}
_dialog = null;
});
_dialog = builder.Create();
_dialog.DismissEvent += (ssender, args) =>
{
ElementController?.SetValueFromRenderer(VisualElement.IsFocusedProperty, false);
};
_dialog.Show();
}
}
I also used this CustomRenderer which was posted before only instead of overriding it you can change the properties like this.
private void Control_Click(object sender, EventArgs e)
{
Picker model = Element;
var picker = new MyNumberPicker(Context);
if (model.Items != null && model.Items.Any())
{
// set style here
picker.MaxValue = model.Items.Count - 1;
picker.MinValue = 0;
picker.SetBackgroundColor(Android.Graphics.Color.Transparent);
picker.SetDisplayedValues(model.Items.ToArray());
//call the method after you setting DisplayedValues
SetPickerDividerColor(picker);
picker.WrapSelectorWheel = false;
picker.Value = model.SelectedIndex;
// change Text Size and Divider
picker.TextSize = 30;
picker.SelectionDividerHeight = 1;
}
My borderless custom renderer for picker
public class BorderlessPickerRenderer : PickerRenderer
{
public static void Init() { }
protected override void OnElementChanged(ElementChangedEventArgs<Picker> e)
{
base.OnElementChanged(e);
if (e.OldElement == null)
{
Control.Background = null;
}
}
}
It will change the picker list text color as white. please see the screenshot
If you check the source code of PickerRenderer, you will find that the Dialog is totally generated in the code behind.
So here to set a Transparent(border-less) background, we can re-write the Click event of this control, for example:
public class BorderlessPickerRenderer : Xamarin.Forms.Platform.Android.PickerRenderer
{
private IElementController ElementController => Element as IElementController;
private AlertDialog _dialog;
protected override void OnElementChanged(ElementChangedEventArgs<Picker> e)
{
base.OnElementChanged(e);
if (e.NewElement == null || e.OldElement != null)
return;
Control.Click += Control_Click;
}
protected override void Dispose(bool disposing)
{
Control.Click -= Control_Click;
base.Dispose(disposing);
}
private void Control_Click(object sender, EventArgs e)
{
Picker model = Element;
var picker = new NumberPicker(Context);
if (model.Items != null && model.Items.Any())
{
picker.MaxValue = model.Items.Count - 1;
picker.MinValue = 0;
picker.SetDisplayedValues(model.Items.ToArray());
picker.WrapSelectorWheel = false;
picker.DescendantFocusability = DescendantFocusability.BlockDescendants;
picker.Value = model.SelectedIndex;
}
var layout = new LinearLayout(Context) { Orientation = Orientation.Vertical };
layout.AddView(picker);
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, true);
var builder = new AlertDialog.Builder(Context);
builder.SetView(layout);
builder.SetTitle(model.Title ?? "");
builder.SetNegativeButton(global::Android.Resource.String.Cancel, (s, a) =>
{
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
// It is possible for the Content of the Page to be changed when Focus is changed.
// In this case, we'll lose our Control.
Control?.ClearFocus();
_dialog = null;
});
builder.SetPositiveButton(global::Android.Resource.String.Ok, (s, a) =>
{
ElementController.SetValueFromRenderer(Picker.SelectedIndexProperty, picker.Value);
// It is possible for the Content of the Page to be changed on SelectedIndexChanged.
// In this case, the Element & Control will no longer exist.
if (Element != null)
{
if (model.Items.Count > 0 && Element.SelectedIndex >= 0)
Control.Text = model.Items[Element.SelectedIndex];
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
// It is also possible for the Content of the Page to be changed when Focus is changed.
// In this case, we'll lose our Control.
Control?.ClearFocus();
}
_dialog = null;
});
_dialog = builder.Create();
_dialog.DismissEvent += (ssender, args) =>
{
ElementController?.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
};
_dialog.Show();
_dialog.Window.SetBackgroundDrawable(new ColorDrawable(Android.Graphics.Color.Transparent));
}
}
Rendering image of this custom picker:
The font color and button's style can be modified as you need since you created this dialog by yourself. And the style of the dialog also depends on the style of your app.
I am facing the following issue.
I am developing a Cross Platform Project on Xamarin and I am trying to open a ContentPage from a MapInfoWindow.
The Map ContentPage is inside the Portable Project and inside the Droid Project I have a the following class that is where I am trying to open the ContenPage:
public class CustomMapRenderer: MapRenderer, GoogleMap.IInfoWindowAdapter, IOnMapReadyCallback
{
GoogleMap map;
List<CustomPin> customPins;
bool isDrawn;
protected override void OnElementChanged(Xamarin.Forms.Platform.Android.ElementChangedEventArgs<Map> e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
{
map.InfoWindowClick -= OnInfoWindowClick;
}
if (e.NewElement != null)
{
var formsMap = (CustomMap)e.NewElement;
customPins = formsMap.CustomPins;
((MapView)Control).GetMapAsync(this);
}
}
public void OnMapReady(GoogleMap googleMap)
{
map = googleMap;
map.InfoWindowClick += OnInfoWindowClick;
map.SetInfoWindowAdapter(this);
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName.Equals("VisibleRegion") && !isDrawn)
{
map.Clear();
if (customPins != null)
{
foreach (var pin in customPins)
{
var marker = new MarkerOptions();
marker.SetPosition(new LatLng(pin.Pin.Position.Latitude, pin.Pin.Position.Longitude));
marker.SetTitle(pin.Pin.Label);
marker.SetSnippet(pin.Pin.Address);
marker.SetIcon(BitmapDescriptorFactory.FromResource(Resource.Drawable.pin));
map.AddMarker(marker);
}
isDrawn = true;
}
}
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
base.OnLayout(changed, l, t, r, b);
if (changed)
{
isDrawn = false;
}
}
void OnInfoWindowClick(object sender, GoogleMap.InfoWindowClickEventArgs e)
{
var customPin = GetCustomPin(e.Marker);
if (customPin == null)
{
throw new Exception("Custom pin not found");
}
//Here I want to open the content page
}
public Android.Views.View GetInfoContents(Marker marker)
{
var inflater = Android.App.Application.Context.GetSystemService(Context.LayoutInflaterService) as Android.Views.LayoutInflater;
if (inflater != null)
{
Android.Views.View view;
var customPin = GetCustomPin(marker);
if (customPin == null)
{
throw new Exception("Custom pin not found");
}
if (customPin.Id == "Xamarin")
{
view = inflater.Inflate(Resource.Layout.XamarinMapInfoWindow, null);
}
else
{
view = inflater.Inflate(Resource.Layout.MapInfoWindow, null);
}
var infoTitle = view.FindViewById<TextView>(Resource.Id.InfoWindowTitle);
var infoSubtitle = view.FindViewById<TextView>(Resource.Id.InfoWindowSubtitle);
if (infoTitle != null)
{
infoTitle.Text = marker.Title;
}
if (infoSubtitle != null)
{
infoSubtitle.Text = marker.Snippet;
}
return view;
}
return null;
}
public Android.Views.View GetInfoWindow(Marker marker)
{
return null;
}
CustomPin GetCustomPin(Marker annotation)
{
var position = new Position(annotation.Position.Latitude, annotation.Position.Longitude);
foreach (var pin in customPins)
{
if (pin.Pin.Position == position)
{
return pin;
}
}
return null;
}
}
So I believe creating an EventHandler in your CustomMap class might be the way to go. In your CustomMap class, add the following:
public event EventHandler InfoTapped;
public virtual void OnInfoTapped(EventArgs e)
{
EventHandler handler = InfoTapped;
if (handler != null)
{
handler(this, e);
}
}
Then in your Forms shared code subscribe to the InfoTapped event and push your new ContentPage:
customMap.InfoTapped += async (sender, e) => {
await Navigation.PushAsync(new ContentPage());
};
Now in your renderer, create a class level field to hold a reference to your CustomMap:
CustomMap formsMap;
And then set this field in your OnElementChanged method:
if (e.NewElement != null)
{
// Remove the var to set your CustomMap field created
// above so you can use it elsewhere in the class
formsMap = (CustomMap)e.NewElement;
...
}
Now you can raise the event you created in CustomMap by calling:
formsMap.OnInfoTapped(e);
E.G.:
void OnInfoWindowClick(object sender, GoogleMap.InfoWindowClickEventArgs e)
{
var customPin = GetCustomPin(e.Marker);
if (customPin == null)
{
throw new Exception("Custom pin not found");
}
//Here I want to open the content page
formsMap.OnInfoTapped(e);
}
And the code you added to the customMap.InfoTapped event handler will be called, in this case to push a new page.