How to enable zoom in and zoom out on a contentpage in xamarin forms?

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How can I enable zoom on a contentpage in xamarin forms? Is it possible to enable it on the entire contentpage? Or is it only possible to zoom in on images?

On the latest features of Xamarin.Forms is pinch gesture inside a ContentPage, here is the official page:

https://developer.xamarin.com/guides/xamarin-forms/user-interface/gestures/pinch/

and for the entire project sample:

https://github.com/xamarin/xamarin-forms-samples/tree/master/WorkingWithGestures/PinchGesture

Here is an example of what you can achieve:

Xamarin.Forms Pinch Example

WebView Zoom on Android, This Android platform-specific enables pinch-to-zoom and a zoom control < ContentPage xmlns:android="clr-namespace:Xamarin.Forms. Setting up a Xamarin.Forms Project Start by creating a new Xamarin.Forms project. You will learn more by going through the steps yourself. Create a new or existing Xamarin forms (.Net standard) Project with Android and iOS Platform. Choose the Mobile App (Xamarin. forms) project under C# and Mobile. Name your app.

Try this Class , this solution do not scroll when you zoom . Source found here: Source Code

    public class PinchToZoomContainer : ContentView {
    double currentScale = 1;
    double startScale = 1;
    double xOffset = 0;
    double yOffset = 0;

    public PinchToZoomContainer ()
    {
        var pinchGesture = new PinchGestureRecognizer ();
        pinchGesture.PinchUpdated += OnPinchUpdated;
        GestureRecognizers.Add (pinchGesture);
    }

    void OnPinchUpdated (object sender, PinchGestureUpdatedEventArgs e)
    {
        if (e.Status == GestureStatus.Started) {
            // Store the current scale factor applied to the wrapped user interface element,
            // and zero the components for the center point of the translate transform.
            startScale = Content.Scale;
            Content.AnchorX = 0;
            Content.AnchorY = 0;
        }
        if (e.Status == GestureStatus.Running) {
            // Calculate the scale factor to be applied.
            currentScale += (e.Scale - 1) * startScale;
            currentScale = Math.Max (1, currentScale);

            // The ScaleOrigin is in relative coordinates to the wrapped user interface element,
            // so get the X pixel coordinate.
            double renderedX = Content.X + xOffset;
            double deltaX = renderedX / Width;
            double deltaWidth = Width / (Content.Width * startScale);
            double originX = (e.ScaleOrigin.X - deltaX) * deltaWidth;

            // The ScaleOrigin is in relative coordinates to the wrapped user interface element,
            // so get the Y pixel coordinate.
            double renderedY = Content.Y + yOffset;
            double deltaY = renderedY / Height;
            double deltaHeight = Height / (Content.Height * startScale);
            double originY = (e.ScaleOrigin.Y - deltaY) * deltaHeight;

            // Calculate the transformed element pixel coordinates.
            double targetX = xOffset - (originX * Content.Width) * (currentScale - startScale);
            double targetY = yOffset - (originY * Content.Height) * (currentScale - startScale);

            // Apply translation based on the change in origin.
            Content.TranslationX = targetX.Clamp (-Content.Width * (currentScale - 1), 0);
            Content.TranslationY = targetY.Clamp (-Content.Height * (currentScale - 1), 0);

            // Apply scale factor
            Content.Scale = currentScale;
        }
        if (e.Status == GestureStatus.Completed) {
            // Store the translation delta's of the wrapped user interface element.
            xOffset = Content.TranslationX;
            yOffset = Content.TranslationY;
        }
    }
}

Helper DoubleExtensions

    public static class DoubleExtensions
{
    public static double Clamp (this double self, double min, double max)
    {
        return Math.Min (max, Math.Max (self, min));
    }
}

Add a pinch gesture recognizer, The pinch gesture is used for performing interactive zoom and is implemented with <ContentPage xmlns="http://xamarin.com/schemas/2014/forms" receives a pinch gesture, the displayed image will be zoomed-in or out. The pinch gesture is used for performing interactive zoom and is implemented with the PinchGestureRecognizer class. A common scenario for the pinch gesture is to perform interactive zoom of an image at the pinch location. This is accomplished by scaling the content of the viewport, and is demonstrated in this article.

You can try using the Scale Api on the Content page. This seemed to work for me on a small test app.

public App ()
{
    // The root page of your application
    var scaleUp = new Button {
        Text = "Scale Up"
    };
    scaleUp.Clicked += (sender, e) => {
        this.MainPage.Scale += 1;
    };

    var scaleDown = new Button {
        Text = "Scale Down"
    };
    scaleDown.Clicked += (object sender, EventArgs e) => {
        this.MainPage.Scale -= 1;
    };

    MainPage = new ContentPage {
        Content = new StackLayout {
            VerticalOptions = LayoutOptions.Center,
            Children = {
                scaleUp,
                scaleDown

            }
        }
    };
}

Xamarin.Forms - Enable Default Zooming In Webview, Xamarin.Forms - Enable Default Zooming In Webview. Delpin Susai Choose the Mobile App (Xamarin. forms) project under C# and Click the Play button to try it out. <ContentPage xmlns="http://xamarin.com/schemas/2014/forms" You can test zoom by emulator also use Shift + ctrl + Left click and� What if we solve this issue by providing zooming capabilities to the view, that way users could zoom the content as they need in order to be able to read it, should be a very handy feature to have. Xamarin Forms might not have this built in by default but sure Android and iOS platform does support this on their scroll views controls, so a

You can use gestures. Sample here : http://arteksoftware.com/gesture-recognizers-with-xamarin-forms/

Zoom Image Functionality In Android Using Xamarin.Forms, This article demonstrates Zoom-In-and-Out Image. This article demonstrates < ContentPage xmlns="http://xamarin.com/schemas/2014/forms"� I'm sure you could create gestures so that you can zoom in and out view pinch or even just move all your content into a zoomable layout and have your buttons live outside so they are not affected. – Andres Castro Apr 7 '16 at 18:21

Xamarin.Forms - Enable Default Zooming in , Enable Default Zooming in Webview in xamarin froms. encoding="utf-8" ?> < ContentPage xmlns="http://xamarin.com/schemas/2014/forms". Xamarin.Forms code runs on multiple platforms, each of which has its own filesystem. This means that reading and writing files are most easily done using the native file APIs on each platform.

I have content page which contain photo. I wanted to add the zoom in and zoom out options however when i tried to add the pinch gesture it is only zoom in but not zoom out? how can I add the zoom out

For internal use by the Xamarin.Forms platform. (Inherited from Page) Content: Gets or sets the view that contains the content of the Page. ControlTemplate: Gets or sets the control template that is used to display content. (Inherited from TemplatedPage) DisableLayout: For internal use by the Xamarin.Forms platform. (Inherited from VisualElement)

Comments
  • If you put the buttons on the bottom of the page, will they move out of the view as you zoom in?
  • @WilliamCorncobDecker I added images to show what it does.
  • I'm just concerned that in practice this is not a feasible option. Most people will not want buttons in the middle of their layouts, they would want them on the top or bottom of the screen. In those cases the buttons would quickly move out of the visible area.
  • @WilliamCorncobDecker This was just a proof of concept. I'm sure you could create gestures so that you can zoom in and out view pinch or even just move all your content into a zoomable layout and have your buttons live outside so they are not affected.
  • @medvedo You can add a pinch gesture like in this example developer.xamarin.com/guides/xamarin-forms/user-interface/… but instead of the content being the image. The content would be the actual page.