I have a problem updating AppBarButton Icon on runtime depending on some conditions.
<AppBarButton x:Name="WeekButton" Click="OnClick" Label="SomeText"
</AppBarButton>
I'm trying to update Icon property in some code behind with this code
WeekButton.Icon = new FontIcon() { Glyph = Runtime_Value_Here};
But nothing happens. The button doesn't change. But in any random time when the code works, It MAY change the button. I always see, that the Icon is new in code, but not on screen. None of the UpdateLayout helps.
Would appreciate any help.
Thanks
UPDATE:
It seems to not working with FontIcon, as with BitmapIcon changing everything works fine.
Force InvalidateArrange and it works
WeekButton.Icon = new FontIcon() { Glyph = "\uE29B", FontFamily = new FontFamily("Segoe UI Symbol")};
WeekButton.InvalidateArrange();
I believed you already found the solution with bitmap icon.
But some people who reached this page and want to know the solution like me,
Here is using bitmap icon and changing app-bar button icon dynamically.
BitmapIcon _bitmapIcon = new BitmapIcon();
_bitmapIcon.UriSource = new Uri("ms-appx:///Assets/yourBitmapIcon.png");
WeekButton.Icon = _bitmapIcon;
Try using the IconUri in order to give the value.
WeekButton.IconUri = new Uri("/Images/pause.png", UriKind.Relative);
Reference: Disable/Enable applicationbar Button in runtime with event textchanged (Windows Phone)
Related
I need to get rid of only the arrow in the navigation bar in Xamarin forms. I tried in but I didn't get a proper solution. please help me overcome this issue. Thanks in advance.
!! I NEED TO REMOVE PERMANENTLY
solutions that I'm tried up to now :
Shell.SetBackButtonBehavior(this, new BackButtonBehavior
{
IsEnabled=false
});
but still, this didn't help me
There is a easy workaround to solve this.
You could override a Icon with a transparent png file(Follow is a transparent png):
and set enabled be false as follows:
Shell.SetBackButtonBehavior(this, new BackButtonBehavior
{
IconOverride = "transparent.png",
IsEnabled = false
}) ;
Then the effect as follows:
Note: You will see that we also can tap that area, therefore we need to set enabled be false.
Based on this official sample to test that.
You can set this using the Xamarin.Forms.NavigationPage class, from within a view's code behind file. E.g. within a ContentPage's constructor.
NavigationPage.SetHasBackButton(this, false);
i made a recycleview that works just fine and gets the data and show it but i want that instead of vertical scroll it will be horizontal scroll.
i searched and read that to control the scroll orientation behavior i need to use the LinearLayoutManager and set it like this:
LinearLayoutManager mLayoutManager = new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false);
recyleview.setLayoutManager(mLayoutManager);
but it dosent work and i dont know why all the examples i saw are with this at the core
anyone have any idea why?\
thanks for any help :)
it was about this line:
LinearLayoutManager mLayoutManager = new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false);
but since i tried a couple of tutorials i had this line somewhere else in my code that i forgot to delete it. the problem it was set with .VERTICAL so when it run the code with .HORIZONTAL was running just fine but because later in the adapter initialize i had the same line but with .VERTICAL so it just overwrite the .HORIZONTAL
so in conclusion just make sure you have ONE LinearLayoutManager initialize at a time :D
Any help with this would be much appreciated.
I am trying to build an app in Windows 8 using xaml and vb.
To test the process of adding a path dynamically to the UI I have created a class that draws a circle using a path (code below). The code fires when a button is tapped/clicked.
The circle then appears briefly near the centre of the screen but then disappears.
If I then count the children on the grid, the circle is counted. Its just not visible.
I'd like to understand what is happening and stop the circle from disappearing.
Dim path As New Windows.UI.Xaml.Shapes.Path
Dim rectG As New EllipseGeometry
rectG.Center = New Point(500, 500)
rectG.RadiusX = 100
rectG.RadiusY = 100
path.Data = rectG
path.Stroke = New SolidColorBrush(Windows.UI.Colors.LightGreen)
path.StrokeThickness = 1
path.Fill = New SolidColorBrush(Windows.UI.Colors.LightGreen)
path.Name = "TestName"
_TargetGrid.Children.Add(path)
Finally figured it out. I needed to set the column and row span property.
On the test I did it using the code although in a proper app it would probably make sense to use some kind of predetermined styling.
However, here is the code I added:
path.SetValue(Grid.ColumnSpanProperty, 5)
path.SetValue(Grid.RowSpanProperty, 5)
I am using monotouch dialog to generate a view. I managed to change the background color by subclassing DialogViewController, but the contrast with the section caption makes the text hard to read. How do I change the section caption color?
I am also using a StyledStringElement as a button in the same view. I cant seem to figure out how to shrink this element so that it looks more like a button. Please provide examples. Your help is appreciated.
To solve this issue I used a glassbutton with the it's HandleTapped handler as below.
var butt = new GlassButton(new RectangleF(80,150,150,50))
{
Font = UIFont.BoldSystemFontOfSize(22),
NormalColor = UIColor.Red,
};
void HandleTapped (GlassButton obj)
{
}
as for the colors, I used miguel's solution here. Hope this helps someone down the road.
I'm developing a WP7 app and the application needs to change the icon of a button on the application bar given the state of a request.
I have tried:
if (App.Servers[index].ServerState == "Enabled")
{
DetailsAppBar.btnStart.IconUri = new Uri("/AppBar/appbar.stop.rest.png");
}
else
{
DetailsAppBar.btnStart.IconUri = new Uri("/AppBar/appbar.transport.play.rest.png");
}
This doesn't give me an error in the code, but it can't compile....
any hints to do this is appreciated :)
thanks
ApplicationBar is a special control that does not behave as other Silverlight controls (see Peter Torr's post on the subject). One of the consequences is that names given in XAML to app bar buttons generate fields in code-behind that are always null.
I'm guessing that in your case the btnStart field in DetailsAppBar is set to null, and thus trying to set its IconUri property results in a NullReferenceException being thrown.
To access a button in an application bar, you must instead reference it by its zero-based index in the buttons list. For instance, the code below returns a reference to the third button in the app bar:
button = (IApplicationBarIconButton)ApplicationBar.Buttons[2];
figured it out...
((ApplicationBarIconButton)ApplicationBar.Buttons[2]).IconUri = new Uri("/AppBar/appbar.stop.rest.png",UriKind.Relative);
did the trick :)