In Xamarin.Forms - Android, I'm trying to use DatePicker.
<StackLayout>
<DatePicker VerticalOptions="CenterAndExpand" Date="{x:Static sys:DateTime.Now}">
<DatePicker.Format>yyyy-MM-dd</DatePicker.Format>
<DatePicker.MinimumDate>
<sys:DateTime x:FactoryMethod="Parse">
<x:Arguments>
<x:String>Jan 1 2000</x:String>
</x:Arguments>
</sys:DateTime>
</DatePicker.MinimumDate>
<DatePicker.MaximumDate>
<sys:DateTime x:FactoryMethod="Parse">
<x:Arguments>
<x:String>Dec 31 2050</x:String>
</x:Arguments>
</sys:DateTime>
</DatePicker.MaximumDate>
</DatePicker>
</StackLayout>
Any one have any idea why my datepicker is being displayed like this? Please, see the image below.
Please help me if anyone has any idea.
Related
Wish you are having a wonderful day,
I'm currently trying to apply some color to a simple slider range.
<Input class="range pr-6 bg-red-500"
type="range"
value="0" min="0"
max="1000"
onChange="rangeSlide(this.value)"
onmousemove="rangeSlide(this.value)"></Input>
It doesn't work at all to change the color like this, I also tried with text and border class.
I made some research and assume I should use this to change the slider bar : -webkit-slider-thumb
Like this :
.range::-webkit-slider-thumb {
background: #00fd0a;
}
However I wish to only use tailwind and dont apply style with pure css. if anyone have any insight to give me I would really appreciate it.
Here is what works for me, using accent-<color>-<number> :
<Input class="range pr-6 accent-red-500"
type="range"
value="0" min="0"
max="1000"
onChange="rangeSlide(this.value)"
onmousemove="rangeSlide(this.value)"></Input>
Also, link to the documentation if someone pass by and need more info : https://tailwindcss.com/docs/accent-color
I have a TableView in which I render form controls for data editing.
However, as soon as the Entry control receives focus, the ViewCell seemingly collapses, leaving only the section title and separator borders visible:
<TableView Intent="Data">
<TableRoot>
<TableSection Title="Details">
<ViewCell>
<Grid ColumnDefinitions="0.5*,0.5*">
<Label Text="Manufacturer" />
<Entry Text="{Binding Manufacturer}" Grid.Column="1" />
</Grid>
</ViewCell>
</TableSection>
</TableRoot>
</TableView>
Initial state:
After tapping the Entry element:
I've tried setting a specific height for the Grid and the Entry control, but I get the same result regardless.
Am I missing something obvious here? 🤔
It's a bug in .NET MAUI: https://github.com/dotnet/maui/issues/10322
I ran into this a while ago and reported it. For now, I have created my own table using a Grid.
You can change The TableView HeightRequest property to a large number such as 700.
This is a temporary workaround until the bug is fixed.
<TableView HeightRequest="700">
<TableRoot>
<TableSection>
<!-- Your code goes here -->
</TableSection>
</TableRoot>
</TableView>
But, in most scenarios, you don't know what the Height is so you could set it dynamically in your code behind.
Page constructor:
public MainPage()
{
InitializeComponent();
// if you want your table height to fit half of the page
Table.HeightRequest = this.Height / 2;
// Rest of logic...
}
Xaml:
<TableView x:Name="Table">
<TableRoot>
<TableSection>
<ViewCell>
<Label Text="Example"/>
</ViewCell>
</TableSection>
</TableRoot>
</TableView>
I want to change the Source of an ImageButton in xaml based on the Theme (i.e. Light vs Dark). I get a System.NullReferenceException 'Object reference not set to an instance of an object.' when I use the following:
<ImageButton
Grid.Row="1"
Margin="10"
Command="{Binding CreateCommand}"
Source="{AppThemeBinding Light=add_box_black_48dp.svg, Dark=add_box_light_48dp.svg}"
HorizontalOptions="End"
VerticalOptions="End"/>
If I change the Source to the following everything works
Source="add_box_white_48dp"
Can I use AppThemeBinding to change the ImageButton Source in this way?
<Edited on 6/4/2022 to show xaml for cases that work and those that do not work. Also changed the names of the svg files to reflect light and dark cases>
I am using Visual Studio Community 2022 (64-bit) - Preview
Version 17.3.0 Preview 1.1
This ImageButton xaml throws the exception:
<ImageButton
Margin="10"
Command="{Binding CreateNewAccountCommand}"
Source="{AppThemeBinding Light=add_light.svg, Dark=add_dark.svg}"
HorizontalOptions="End"
VerticalOptions="End"
BackgroundColor="#376489"
CornerRadius="8"
WidthRequest="36"
HeightRequest="36">
</ImageButton>
This ImageButton xaml works and does not throw an exception
<ImageButton
Margin="10"
Command="{Binding CreateNewAccountCommand}"
Source="add_light.svg"
HorizontalOptions="End"
VerticalOptions="End"
BackgroundColor="#abdbe3"
CornerRadius="8"
WidthRequest="36"
HeightRequest="36">
</ImageButton>
This also works and does not throw an exception
<ImageButton
Margin="10"
Command="{Binding CreateNewAccountCommand}"
Source="add_dark.svg"
HorizontalOptions="End"
VerticalOptions="End"
BackgroundColor="#376489"
CornerRadius="8"
WidthRequest="36"
HeightRequest="36">
</ImageButton>
To work cross-platform, refer to .png files. These get built automatically by Maui:
Each image resource needs Property/BuildAction: "MauiImage".
Refer to .png in xaml:
Source="{AppThemeBinding Light=add_box_black_48dp.png, Dark=add_box_light_48dp.png}"
Verified by modifying Maui project's default MainPage, to say:
<Image Source="{AppThemeBinding Light=dotnet_bot.png, Dark=dotnet_bot.png}" ... />
This refers to a Media item dotnet_bot.svg, which (I infer) gets converted by "MauiImage" into a .png resource.
NOTE: Maybe the plan is to be able to leave off the extension. This works on Android, but the image does not show on Windows:
<!-- Doesn't work currently on Windows -->
<Image Source="{AppThemeBinding Light=dotnet_bot, Dark=dotnet_bot}" ... />
I want to make a xamarin forms carousel view containing 2 custom views. I have this code:
<ContentPage x:Class="MainView" xmlns:mvvm="clr-namespace:Prism.Mvvm;assembly=Prism.Forms" xmlns:views="clr-namespace:Views" x:Name="Main">
<CarouselView>
<CarouselView.ItemsSource>
<x:Array Type="{x:Type View}">
<views:View1 mvvm:ViewModelLocator.AutowirePartialView="{x:Reference Main}" />
<views:View2 mvvm:ViewModelLocator.AutowirePartialView="{x:Reference Main}" />
</x:Array>
</CarouselView.ItemsSource>
<CarouselView.ItemTemplate>
<DataTemplate>
<ContentView Content="{Binding .}" />
</DataTemplate>
</CarouselView.ItemTemplate>
</CarouselView>
</ContentPage>
When launching the app, exception is thrown:
Xamarin.Forms.Xaml.XamlParseException: 'Position 80:37. Can not find
the object referenced by Main'
If I just set both views as direct content of the main page, it works fine. What am I doing wrong?
Is there a way to make the collection of views through the MainViewModel?
I want to place a text field in a matrix layout. Please check below code and please suggest how to check XML code errors? Every time I stuck in designing the XML code. Please suggest me how to overcome that.
<core:View
xmlns:core="sap.ui.core"
xmlns:mvc="sap.ui.core.mvc"
xmlns="sap.m"
xmlns:l="sap.ui.commons.layout"
controllerName="matrix.matrix"
xmlns:html="http://www.w3.org/1999/xhtml">
<Page title="ytftfhgff">
<content>
<l:MatrixLayout layoutFixed="true" columns="4" width="600px" widths="150px,150px,150px,150px">
<l:MatrixLayoutRow>
<l:MatrixLayoutCell colSpan="4">
<Text text="Its a heading" />
</l:MatrixLayoutCell>
</l:MatrixLayoutRow>
<l:MatrixLayoutRow>
<l:MatrixLayoutCell>
<Label text="First Name"/>
</l:MatrixLayoutCell>
<l:MatrixLayoutCell>
<TextField id="axscx" width="20em"></TextField>
</l:MatrixLayoutCell>
</l:MatrixLayoutRow>
</l:MatrixLayout>
</content>
</Page>
</core:View>
Thanks in advance,
sriman.
In general the errors logged by the XMLTemplateParser to the console should be understandable enough to get a basic idea of what's going wrong. In your case it is quite simple. The default namespace is set to "sap.m", i.e. the runtime tries to load the TextField control from that library. This cannot work as sap.m does not have a TextField control.
You can either use the Input control, i.e. replace TextField with Input. Or introduce an additional namespace:
xmlns:commons="sap.ui.commons"
and define the TextField in the following way:
<commons:TextField id="axscx" width="20em"/>
I would prefer using the Input field.