I am new to MAUI. And I haven't done anything complex with Xamarin as well.
The application I am testing with, has Shell navigation. And I can't find a way to change the toolbar items.
I would like to be able to change either the FontSize of the text, or the color of the SVG image. And I do not want those changes to affect the rest of my application, if possible. But if there is no other way, I can live with it.
I have managed to add styling to buttons, Labels etc... If styling is an option to this, it will be even better.
If I am on the wrong path, if you point me out why, I will be also grateful.
Thank you in advance!
If you want to just change a part of pages in your project. You can try to use a <Shell.TitleView> instead of the <Shell.ToolBarItem> in the content pages you want. Such as:
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="MauiAppTest.MainPage">
<Shell.TitleView>
<HorizontalStackLayout Margin="5" HorizontalOptions="End">
<Label Text="hello" TextColor="Red" FontSize="Medium" VerticalOptions="Center" HorizontalOptions="End" />
<Image Source="your image" Margin="10" Background="green"/>
</HorizontalStackLayout>
</Shell.TitleView>
You can change style of TabBar in Style.xaml in path \Resources\Style\. Search in file for Shell.TabBarForegroundColor. You will get TargetType="Shell" and this is style for AppShell.xaml.
Related
I've been working on creating a custom control for some time. After several iterations I've come to the conclusion that I am having a binding issue... As it is, when I place my control into a simple XAML page and execute the feature, it works just fine. However, when I need to instantiate numerous controls on a single page, i.e. into a collection, flexlayout, carouselview the Command and CommandParameter bindings get lost... and the ViewModel calls no longer occur.
My control is simple... think of a checkbox replacement. I place A 1x1 grid, with a frame (for the outline) and a label to place a single character... "A", "B", "C"... "1". "2". "3"... whatever you would require... I have bindable properties.. Text, TextColor, BorderColor, BackgroundColor, and "Selected".
So, now I need to have a page ask the question... "How do you feel about... whatever... Pick all that apply." Then I provide a list... with number or lettered items... The user can select none, any, or all... So I create a view with a series of questions, that have a list of "checkable" items... As I said above, the control works perfectly if it is in a standalone page... If I generate a List of these controls dynamically, Command and CommandParameter suddenly no longer work.
my test implementation looks something like the following... although in this case think something much simpler like a "lottery ticket" number chooser. In this case the ViewModel would have a simple ObservableCollection<string> PrimaryControlList; And, the CommandParamter will call a VM function along with the text of the control in order to track the items the user has selected.
<Frame x:Name="primaryFrame">
<FlexLayout x:Name="flexPrimary" BindableLayout.ItemsSource="{Binding PrimaryControlList}" Wrap="Wrap" Direction="Row" JustifyContent="SpaceAround" AlignItems="Start" AlignContent="Start" >
<BindableLayout.ItemTemplate>
<DataTemplate>
<local:NumberSelect Text="{Binding .}" Command="Binding DoSomethingWithThis" CommandParameter="{Binding .}"/>
</DataTemplate>
</BindableLayout.ItemTemplate>
</FlexLayout>
</Frame>
Can anyone provide guidance?
The command is in your ViewModel while the current BindingContext of FlexLayout is PrimaryControlList.
Solution:
First, give a name to your ContentPage, let's say it MyPage:
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:d="http://xamarin.com/schemas/2014/forms/design"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
x:Name="MyPage"
x:Class="App266.MainPage">
Assume your page binds to a ViewModel and your binding of command should be:
<local:NumberSelect Text="{Binding .}" Command="{Binding BindingContext.ButtonCommand, Source={x:Reference MyPage}}" CommandParameter="{Binding .}"/>
I want to bring a search tab on top of a tabbed page in Xamarin Forms. This is the UI I want to implement.
As you can see a search bar on top of tab vendor name and product/service. I don't know how to implement it. I have tried this code
<TabbedPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:pages="clr-namespace:RestaurantApp"
x:Class="RestaurantApp.SearchTabbedPage"
NavigationPage.HasNavigationBar="False">
<ContentPage>
<StackLayout>
<StackLayout Orientation="Horizontal"
HorizontalOptions="FillAndExpand"
Padding="5">
<Label TextColor="#606060" FontSize="Large" Text="EXPLORE"
HorizontalOptions="CenterAndExpand"/>
</StackLayout>
<BoxView Color="#E0E0E0" WidthRequest ="80" HeightRequest="1"/>
<Frame CornerRadius="10" Padding="0" OutlineColor="DarkGray" HasShadow="True" HorizontalOptions="Fill" Margin="10,0,10,0" VerticalOptions="Center">
<pages:searchTab x:Name="searchBar" Placeholder="Search" PlaceholderColor="Black" TextColor="Black" HorizontalOptions="FillAndExpand" VerticalOptions="Center" />
</Frame>
</StackLayout>
</ContentPage>
<TabbedPage.Children>
<NavigationPage Title="VENDOR NAME">
<x:Arguments>
<pages:TabbedPageExampleTab1 />
</x:Arguments>
</NavigationPage>
<NavigationPage Title="PRODUCT/SERVICE">
<x:Arguments>
<pages:TabbedPageExampleTab2 />
</x:Arguments>
</NavigationPage>
</TabbedPage.Children>
</TabbedPage>
But it created one more tab. I don't know how to implement this. And I'm not getting any solution for this. Any suggestions?
Note:
I have the code for navigation tab title and bottom navigation bar. And I want to keep them common for both the tabbed page. So it has to be implemented in the same way as the search tab.
You can't add a (Content)Page inside a (Tabbed)Page. You have to change your layout, so you have a ContentPage and inside of it, you add a Label (Header "Explore"), SearchBar, Custom Tabs (not TabbedPage) with Lists...
For Tabs you can use either your custom layout build with buttons which change visibility of the Lists, or you can use some fancier existing solutions like TabView from Telerik, or Segmented Bar Control by Rendy.
UI Tips: From UI perspective your mockup could be a little better if you have one TabbedPage with 4 Children:
Near Me
Search - if the user clicks on Add, you can dynamically change the Cart
Cart
Account
If you have the newest Xamarin Forms nuget package (from 3.1), you can add tabs on the bottom.
TabbedPage can accept content page as only children.
If you want to add search view on top of navigation bar this article can help you https://www.linkedin.com/pulse/xamarin-forms-contentpage-searchbar-navigation-bar-vipin-mathews
I am making an App that has the same header on every screen, so I created a ControlTemplate for that part of the app, put some buttons on it and that works. I am pretty happy with it.
Three screens have almost identical footer, only different text color and images. I made another ControlTemplate for the footer, and I would like to manipulate the IsVisible property on the images with bindings, according to what page is currently dislayed, but I am not able to figure out how to do it.
I know that I need to write a converter, I did that, that doesn't seem to be complicated, but I can't figure out a way to actually bind the values in those properties.
Both of ControlTemplates are defined on the application level.
This is an example of how I use them, maybe this is wrong:
<ContentView ControlTemplate="{StaticResource Header}">
<!--This is the actuall page content-->
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="9*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!--Content of the page!-->
<Label Text="Welcome to Xamarin.Forms!"
VerticalOptions="Center"
HorizontalOptions="Center"
Grid.Row="0"/>
<!--Footer of the page!-->
<ContentView ControlTemplate="{StaticResource BuySellPayFooter}"
Grid.Row="1"/>
</Grid>
</ContentView>
I need to bind properties of some class in the footer. How to do it? Is it achievable?
I use ControlTemplate to show an ActivityIndicator on every page.
For property IsVisible of the indicator, I bind it with property IsBusy of the
page.
And this is how I bind it in the XAML of the ControlTemplate:
IsVisible="{TemplateBinding BindingContext.IsBusy}"
If I want to change the color of the indicator on each page, I can define BusyColor property for the page and binding it:
Color="{TemplateBinding BindingContext.BusyColor}"
The code I have looks like this:
<ListView.Header>
<StackLayout VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
<StackLayout Padding="10,35,10,10" Orientation="Horizontal" HorizontalOptions="FillAndExpand">
<local:ExtLabel ExtStyleId="Body" Text="Custom body Label"></local:ExtLabel>
<local:ExtLabel ExtStyleId="Header" Text="Custom hdr Label"></local:ExtLabel>
</StackLayout>
</StackLayout>
</ListView.Header>
Would it be possible to implement this with a <Grid> and does the <Grid> offer more flexibility than <StackLayout> ?
I think you might want to have a look at this excellent blog post about this. The source is an employee from Xamarin, even more so, one of the founders of Forms.
A few of the bullets in reference to Layouts:
DO NOT use a StackLayout to host a single child.
DO NOT use a Grid when a StackLayout suffices.
DO NOT use multiple StackLayouts when a Grid suffices.
DO use a Grid to achieve layering.
In regard to looks, you could achieve the same with both. In regard to performance, take a look at the full blog post (and these rules) to decide what is the better option.
FYI I'm pretty new to Silverlight.
Okay, so I want to build a simple user control that contains a button plus some additional XAML as specified by the client of the control.
I got searching on Google and found at least 30 different articles that were all very confusing; especially because they talk about styling animation, customizing other controls that you don't own, and other crap I'm not ready for yet.
This is what I did.
In VS 2010, I right clicked and added a new UserControl called MyControl
To the MyControl.xaml I changed the LayoutRoot to a StackPanel and added a Button inside it
In my MainPage.xaml I added an instance of MyControl
I added a TextBox as a child element of this instance
I tried to build and got an error that MyControl didn't support Direct Content
Googled some more..
I changed MyControl to inherit from ContentControl and updated the xaml
I added a ContentPresenter in the xaml to represent the client "custom content"
Okay, it builds and the TextBox shows up, but the Button is missing.
Here's the relevant section from MainPage.xaml
<my:MyControl HorizontalAlignment="Left" Margin="49,26,0,0" x:Name="myContentControl1" VerticalAlignment="Top" Height="550" Width="389">
<TextBox Height="72" HorizontalAlignment="Left" Margin="166,339,0,0" Name="textBox1" Text="TextBox" VerticalAlignment="Top" Width="460" />
</my:MyControl>
Here's the MyControl.xaml
<ContentControl x:Class="ContentControlTest.MyControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
d:DesignHeight="480" d:DesignWidth="480">
<StackPanel x:Name="LayoutRoot" Background="{StaticResource PhoneChromeBrush}" Orientation="Vertical">
<ContentPresenter/>
<Button Content="Button" Height="72" HorizontalAlignment="Left" Margin="78,254,0,0" Name="FooFoo" VerticalAlignment="Bottom" Width="160" />
</StackPanel>
</ContentControl>
And here is the MyControl.cs
using System.Windows.Controls;
namespace ContentControlTest
{
public partial class MyControl : ContentControl
{
public MyControl()
{
InitializeComponent();
}
}
}
The way I thought it worked was that the child elements of the control instance are set as the Content property on the ContentControl base class of MyControl. Then, ContentPresenter "pastes" that content into the MyControl.xaml wherever appears.
Although that does seem to be how it works, in the process it is "eating" the Button that I have defined in the MyControl.xaml.
I'm trying not to get into ControlTemplate etc that at this point unless it is absolutely necessary.
Can someone with a clue please tell me what I am doing wrong.
thanks!
That's because the Content of the control is the entire StackPanel you've written by hand; when you set a new Content, the StackPanel is replaced.
A ControlTemplate is necessary for this scenario, I think; it would be a very simple one after all. The starting point can be the default style of the content control; put the style inside a ResourceDictionary (for instance, in the <ContentControl.Resources> section of your user control), and you're ready to go; all you need to do is add a grid and button inside that template.
Note that the style I linked to sets itself as the default for any reachable ContentControl; to make it only apply to your control and not to any children that may appear inside it, add x:Key="someKey" to the Style and set the ContentControl's Style property explicitly to Style={StaticResource someKey}.
Let me know if you need additional information; also, I might be wrong and there may be an easier way, but I doubt it; the Content property is meant to behave exactly like what you described.