I have two images to simulate the click on the button, but I want is when clicking the image and change call another screen. And the process does not happen because the application is stopping
<StackLayout>
<!-- Place new controls here -->
<Image Source="botaocadastrolivre.png">
<Image.GestureRecognizers>
<TapGestureRecognizer
Tapped="OnTapGestureRecognizerTapped"
NumberOfTapsRequired="1" />
</Image.GestureRecognizers>
</Image>
</StackLayout>
void OnTapGestureRecognizerTapped(object sender, EventArgs args)
{
tapCount++;
var imageSender = (Image)sender;
// watch the monkey go from color to black&white!
if (tapCount % 2 == 0)
{
imageSender.Source = "botaocadastrolivre.png";
}
else
{
imageSender.Source = "botaocadastroPresed.png";
Navigation.PushAsync(new Nova());
}
// Task.Delay(100)
//Navigation.PushAsync(new Nova());
}
Go to your App.xaml.cs file, find the line that says something like:
MainPage = new MainPage();
and change it into:
MainPage = new NavigationPage(new MainPage());
This will wrap your page into a navigation page and then the Navigation object will know how to navigate from one page to the other.
It might be wise to read up on navigation concepts in Xamarin.Forms: https://learn.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/navigation/
Related
Entry box should be rounded with an icon to the left or right in it. I'm using the code presented here to create this custom entry.
1. Remove the rectangular border of Entry
Used CustomRender to achieve this.
Forms
public class NoUnderlineEntry : Entry
{
public NoUnderlineEntry()
{
}
}
Android
Set Background to null
public class NoUnderLineEntryRenderer : EntryRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
{
base.OnElementChanged(e);
this.Control.Background = null;
}
}
iOS
Set BorderStyle to None
public class NoUnderlineEntryRenderer : EntryRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
{
base.OnElementChanged(e);
this.Control.BorderStyle = UIKit.UITextBorderStyle.None;
}
}
2. Placing Image next to Entry
Adding Image and Entry to the same Grid in two columns.
3. Adding Rounded border to the Entry and Image
Add them inside a Frame with CornerRadius.
XAML
<StackLayout>
<Frame
Padding="10, 5, 10, 5"
HasShadow="False"
BorderColor="Gray"
CornerRadius="30">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="50"/>
</Grid.ColumnDefinitions>
<local:NoUnderlineEntry/>
<Image Source="icon.png" Grid.Column="1" WidthRequest="50" Aspect="AspectFit"/>
</Grid>
</Frame>
</StackLayout>
UI result:
Please note: I won't present a copy-and-paste-able answer, but rather an outline on how to add the images. You'll have to integrate the code in your solution by yourself.
On iOS
There already is an answered question on how to achieve this with Swift on iOS, you can find it here.
Basically what to do is to set the right view (or left view respectively) on the UITextField from your custom renderer (in OnElementChanged).
protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
{
base.OnElementChanged(e);
var imageView = new UIImageView(new CGRect(0, 0, 20, 20));
var image = UIImage.FromFile("ic_location.png");
imageView.Image = image;
this.Control.RightView = imageView;
this.Control.RightViewMode = UITextFieldViewMode.Always;
}
This sets the view in the right of the UITextField to a UIImageView. If you wanted to show the icon before the text instead, you'd have to set LeftView and LeftViewMode instead. This is how it looks like. (I intentionally did not inline the image, because it rendered the answer less redable.)
Of course the file ic_location.png has to be in your platform projects resources.
You may need some fine tuning, but basically that's it.
On Android
The TextView.setCompoundDrawablesWithIntrinsicBounds
Sets the Drawables (if any) to appear to the left of, above, to the right of, and below the text. Use null if you do not want a Drawable there. The Drawables' bounds will be set to their intrinsic bounds. (source)
By loading the icon from the resource and setting it with SetCompoundDrawablesWithIntrinsicBounds (uppercase now, since we're now on C#) you can display the Entry with the icon:
protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
{
base.OnElementChanged(e);
this.Control.SetCompoundDrawablesWithIntrinsicBounds(null, null, this.GetIcon(), null);
this.Control.CompoundDrawablePadding = 25;
}
private Drawable GetIcon()
{
int resID = Resources.GetIdentifier("ic_location", "drawable", this.Context.PackageName);
var drawable = ContextCompat.GetDrawable(this.Context, resID);
var bitmap = ((BitmapDrawable)drawable).Bitmap;
return new BitmapDrawable(Resources, Bitmap.CreateScaledBitmap(bitmap, 20, 20, true));
}
This is how the Android version looks like.
For showing the icon on left left, pass the drawable to the first parameter instead of the third.
Suppose I am making a simple UWP application which navigates through several pages. I would like to have a common background for all pages, depending on which background a user has selected from the Settings page.
I have a SettingsPage.xaml with a comboBox (and Grid Background that needs to change):
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<ComboBox Name="ColourSelect" SelectionChanged="ComboBox_SelectionChanged">
<ComboBoxItem Name="Red">Red</ComboBoxItem>
<ComboBoxItem Name="Green">Green</ComboBoxItem>
<ComboBoxItem Name="Blue">Blue</ComboBoxItem>
</ComboBox>
</Grid>
Which interfaces with my SettingsPage.xaml.cs file:
private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
// Change background
if (Red.IsSelected) { } // Change to Red.png
else if (Green.IsSelected) { } // Change to Green.png
else if (Blue.IsSelected) { } // Change to Blue.png
}
I have set up my App.xaml to contain a background resource, but I'm not sure how to bind it to the C# in Settings.xaml.cs.
<Application.Resources>
<Style TargetType="Grid" x:Key="CommonBackground">
<Setter Property="Background" Value="{ <!-- Some image. How to bind? --> }"
</Style>
</Application.Resources>
What should I return to bind the user decision to the Application resources?
Thank you in advance!
This requires few changes in different pieces of application. Follow my steps.
In this case I a am creating two Resources. One that will maintain the Settings Combobox Colour Scheme. Second one is BitMapImage in Resource.
So my Application.Resource will look something like below.
<Application.Resources>
<image:BitmapImage x:Key="BackgroundSource" UriSource="ms-appx:///Assets/Red.png" />
<x:String x:Key="BackgroundBrush">Red</x:String>
</Application.Resources>
Make sure you are adding xmlns:image="using:Windows.UI.Xaml.Media.Imaging" in your App.xaml.
Now Create a Static Method inside App.xaml.cs that will be used to update Background to the Page during Run time. It should be something like below.
public static void UpdateBGColors(string Color)
{
switch (Color)
{
case "Red":
Current.Resources["BackgroundSource"] = "ms-appx:///Assets/Red.png";
break;
case "Green":
Current.Resources["BackgroundSource"] = "ms-appx:///Assets/Green.png";
break;
case "Blue":
Current.Resources["BackgroundSource"] = "ms-appx:///Assets/Blue.png";
break;
default:
Current.Resources["BackgroundSource"] = "ms-appx:///Assets/Red.png";
break;
}
}
Now Your combobox_SelectionChanged should look like below.
private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
ComboBox cb = sender as ComboBox;
ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;
localSettings.Values["BackgroundBrush"] = (cb.SelectedValue as ComboBoxItem).Content;
App.UpdateBGColors((cb.SelectedValue as ComboBoxItem).Content.ToString());
}
Now you need to wire up the Background of each page to the Resource BackgroundSource. So anywhere you want the background to be set based on settings add below lines of code
<Grid>
<Grid.Background>
<ImageBrush ImageSource="{StaticResource BackgroundSource}" />
</Grid.Background>
......
</Grid>
At this point, if you change the setting in setting page and if you navigate back to original page that you came into setting page, The background should be set automatically to whatever you selected in Settings.
But you also want to make sure the same background is loaded when the app is opened next time. To do that in App.xaml.cs, Add below lines in the beginning of OnLaunched Event.
ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;
if (localSettings.Values["BackgroundBrush"] != null)
{
UpdateBGColors(localSettings.Values["BackgroundBrush"].ToString());
}
Since in settings page, you are saving BackgroundBrush Everytime you change the Combobox Item, Whenever your app is loading, Based on the BackgroundBrush BackgroundSource will be assigned to correct Uri and will be used as Page Backhground.
Full Repo is available Here
Good Luck.
[Update] You can use this, and after save your settings.
SettingsPage.xaml
<Grid>
<Grid.Background>
<ImageBrush x:Name="colorImage" Stretch="UniformToFill"/>
</Grid.Background>
<ComboBox Name="ColourSelect" SelectionChanged="ComboBox_SelectionChanged">
<ComboBoxItem Name="Red">Red</ComboBoxItem>
<ComboBoxItem Name="Green">Green</ComboBoxItem>
<ComboBoxItem Name="Blue">Blue</ComboBoxItem>
</ComboBox>
</Grid>
SettingsPage.xaml.cs
private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (Red.IsSelected)
{
ChangeColorImage("ms-appx:///Assets/Red.png");
}
else if (Green.IsSelected)
{
ChangeColorImage("ms-appx:///Assets/Green.png");
}
else if (Blue.IsSelected)
{
ChangeColorImage("ms-appx:///Assets/Blue.png");
}
}
private void ChangeColorImage(string imageUrl)
{
// using Windows.UI.Xaml.Media.Imaging;
BitmapImage imageSource = new BitmapImage(new Uri(imageUrl));
colorImage.ImageSource = imageSource;
}
How to change the Button content as CamelCasing in Windows phone 8.1 Message dialog?
private async void Button_Click(object sender, RoutedEventArgs e)
{
MessageDialog msg = new MessageDialog("Do you want to continue?");
msg.Commands.Add(new UICommand("Ok", (command) => { }));
msg.Commands.Add(new UICommand("Cancel", (command) => { }));
await msg.ShowAsync();
}
I want to change the ok as Ok and cancel as Cancel.
If you want a custom dialog you need to use a different control. The MessageDialog always lower cases the buttons to match the system style and is not generally customizable.
If you use a ContentDialog you can customize it fairly extensively, and it doesn't try to fix the case of its buttons. You'll probably want to create your own ContentDialog class (there's a template under Add.New Item...) with your desired contents, but here's a quick content-free example:
ContentDialog cd = new ContentDialog();
cd.Title = "My Title";
cd.PrimaryButtonText = "CoNtInUe";
cd.SecondaryButtonText = "sToP";
await cd.ShowAsync();
Also note that the guidelines for message dialogs suggest using clear and specific verbs rather than generic OK/Cancel.
Use Content Dialog box like this:
Add this code inside your xaml.
<ContentDialog x:Name="AlertMessage" Background="#363636" IsSecondaryButtonEnabled="True" SecondaryButtonText="Cancel" IsPrimaryButtonEnabled="True" PrimaryButtonText="Ok" >
<ContentDialog.Content>
<StackPanel Name="rootStackPanel" Height="Auto" >
<StackPanel Margin="0">
<StackPanel Margin="0,0,0,10" Orientation="Horizontal">
<TextBlock x:Name="HeadingText" x:FieldModifier="public" Style="{StaticResource ApplicationMessageBoxHeadingStyle}" Text="Alert" />
<Image Margin="10,05,0,0" Source="/Assets/Images/alert.png" Width="35"></Image>
</StackPanel>
<TextBlock x:FieldModifier="public" x:Name="ContentText" Style="{StaticResource ApplicationMessageBoxErrorStyle}" Text="Are you sure you want to log off ?" />
</StackPanel>
</StackPanel>
</ContentDialog.Content>
</ContentDialog>
And call this like that in your code:
private void AppBarButton_Click(object sender, RoutedEventArgs e)
{
MessageBox();
}
private async void MessageBox()
{
ContentDialogResult LogoutDialog = await AlertMessage.ShowAsync();
if (LogoutDialog == ContentDialogResult.Primary)
{
// User pressed Ok.
}
else
{
// User pressed Cancel or the back arrow.
// Terms of use were not accepted.
}
}
Here is the code:
CustomMessageBox messagebox = new CustomMessageBox()
{
Caption = "Do you want to continue?",
LeftButtonContent = "Ok",
RightButtonContent = "Cancel"
};
So basically I want to have a button with a certain background image.
For example, when the app is loaded you would see a button with it's background image as image1.png and then when it is clicked you see image2.png as the background image. Then when you click again, the background image is switched back to image1.png.
Even though I have done this in C#, I want to do it in XAML because every time you click a button it automatically lights up according to the theme color, and the only way to get rid of that is via XAML.
Here is my code so fa:
<Button x:Name="Buttons" Content="" HorizontalAlignment="Left" Margin="155,0,0,69" BorderBrush="Transparent" Width="140" Click="Button_Click" Height="141" VerticalAlignment="Bottom">
<Button.Background>
<ImageBrush Stretch="Fill" ImageSource="/Assets/image1.png"/>
</Button.Background>
</Button>
Thanks in advance!
Try this,
http://visualstudiomagazine.com/articles/2013/02/15/customize-windows-phone-togglebutton.aspx
Here, the ToggleButton that ships with the SDK has been templated to add a clicked and unclicked image.
Alternate Solution with a checkbox:
Creating own toggle button in WP8?
VisualStudio 2017 "Blank App"
XAML
<Button x:Name="button" Content="Button1" HorizontalAlignment="Left" Margin="400,20,0,0" VerticalAlignment="Top" RenderTransformOrigin="-1.258,-5" Click="Button_Click" Height="80" Width="80"/>
C# (Set the original image in the properties of the button: right-click -> Brush -> image)
private void Button1_Click(object sender, RoutedEventArgs e)
{
button1.Background = new ImageBrush { ImageSource = new BitmapImage(new Uri("ms-appx:/Images/timerg.png", UriKind.RelativeOrAbsolute)) };
}
or C#
private void Button1_Click(object sender, RoutedEventArgs e)
{
BitmapImage bmp = new BitmapImage();
Uri u = new Uri("ms-appx:/Images/timer.png", UriKind.RelativeOrAbsolute);
bmp.UriSource = u;
// NOTE: change starts here
Image i = new Image();
i.Source = bmp;
button1.Content = i;
}
I am making a Windows 8 application in visual studio 2012 c#.
I am having an image '1.png' and I want to rotate it at any angle as an animation along its center point.
But i want to do it with the help of c# code rather than XAML code.
Thank You in Advance.
In your XAML, have the following image:
<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
<Image Source="/Assets/Logo.png" Width="300" RenderTransformOrigin="0.5, 0.5">
<Image.RenderTransform>
<RotateTransform x:Name="rotateTransform"/>
</Image.RenderTransform>
</Image>
</Grid>
Then, in code, write the following when you want to animate (you create the Storyboard programmatically, then add to it a relevant Timeline. Note that you can also create the RotateTransform in code if you want.
async void MainPage_Loaded(object sender, RoutedEventArgs e)
{
await Task.Delay(500);
Storyboard board = new Storyboard();
var timeline = new DoubleAnimationUsingKeyFrames();
Storyboard.SetTarget(timeline, rotateTransform);
Storyboard.SetTargetProperty(timeline, "Angle");
var frame = new EasingDoubleKeyFrame() { KeyTime = TimeSpan.FromSeconds(1), Value = 360, EasingFunction = new QuadraticEase() { EasingMode = EasingMode.EaseOut } };
timeline.KeyFrames.Add(frame);
board.Children.Add(timeline);
board.Begin();
}
This will rotate the object 360 degrees.
BTW: I am writing a set of posts that show an even better way of animating. It's not done yet, but it will give you a general idea on how to get a framework for certain types of animations..
First part of the series
Thanks Shahar! I took your example and made a custom control. It's actually an infinite spinning of one ring image.
Spinner.xaml:
<UserControl x:Class="MyControls.Spinner"
...
<Grid >
<Image Source="/Assets/Images/spinner.png" Width="194" RenderTransformOrigin="0.5, 0.5">
<Image.RenderTransform>
<RotateTransform x:Name="rotateTransform"/>
</Image.RenderTransform>
</Image>
</Grid>
</UserControl>
Spinner.cs:
namespace MyControls
{
public partial class Spinner: UserControl
{
public Spinner()
{
InitializeComponent();
this.Loaded += Spinner_Loaded;
}
private void PlayRotation()
{
Storyboard board = new Storyboard();
var timeline = new DoubleAnimationUsingKeyFrames();
Storyboard.SetTarget(timeline, rotateTransform);
Storyboard.SetTargetProperty(timeline, new PropertyPath("(Angle)"));
var frame = new EasingDoubleKeyFrame() { KeyTime = TimeSpan.FromSeconds(5), Value = 360, EasingFunction = new QuadraticEase() { EasingMode = EasingMode.EaseOut } };
timeline.KeyFrames.Add(frame);
board.Children.Add(timeline);
board.RepeatBehavior = RepeatBehavior.Forever;
board.Begin();
}
private async void Spinner_Loaded(object sender, RoutedEventArgs e)
{
PlayRotation();
}
}
}
Then when you want to use Spinner in another xaml, it's very simple:
Just add a line for it inside any Grid etc:
<include:Spinner/>
(of course you need to define include as something like:
xmlns:include="MyControls"
on top of your xaml)