IOGesture

A lightweight and easy-to-use library for handling touch and gesture events in Blazor applications. This wrapper is built on top of the TinyGesture library and provides seamless integration with Blazor components.

Features

• Pan Gestures: Detect and handle pan gestures with start, move, and end callbacks.
• Swipe Gestures: Easily recognize swipe gestures in all directions (up, down, left, right).
• Tap Gestures: Identify single tap and double tap gestures.
• Long Press: Handle long press events.
• Pinch and Rotate: Manage pinch (zoom) and rotate gestures, complete with start and end callbacks.
• Customizable Options: Configure gesture thresholds and other settings to fine-tune the gesture detection.

ℹ️ For more information please check the TinyGesture repository.

Getting Started

Installation

1. Install IOGesture with dotnet cli in your Blazor app.

dotnet add package IOGesture 

2. Add the tinygesture.js and IOGesture.js script tag in your root file _Host.cshtml for Blazor Server Apps or index.html for Blazor WebAssembly Apps:

<script src="_framework/blazor.server.js"></script>
<script src="_content/IOGesture/js/IOGesture.js" type="module"></script>
<script src="_content/IOGesture/js/tinygesture.js" type="module"></script>

Usage

Use the IOGesture.Components then you can use the component:

@using IOGesture.Components

<Gesture>
  <h1>Swipe me.</h1>
</Gesture>

Then you can listen to gesture event callbacks and pass the options with type of GestureOptions, You can access various properties of the gesture using the Properties object after you referenced the Gesture instance:

<Gesture 
    @ref="ioGesture"
    OnPanMove="HandlePanMove"
    Options="gestureOptions">
    <Content>
        <!-- Your content here -->
    </Content>
</Gesture>

@code {
    private Gesture? ioGesture;
    private GestureOptions gestureOptions = new GestureOptions
    {
        VelocityThreshold = 10,
        PressThreshold = 8,
        DiagonalSwipes = false,
        DiagonalLimit = 15,
        MouseSupport = true
    };

    private void HandlePanMove()
    {
        Console.WriteLine($"X: {_panMovingInstance.Properties.TouchMoveX}, Y: {_panMovingInstance.Properties.TouchMoveY}");
    }

    private void HandleSwipeLeft()
    {
        // Handle swipe left
    }
}

GestureOptions Configuration

Customize gesture detection by setting properties in GestureOptions:

• VelocityThreshold: Minimum velocity the gesture must be moving when the gesture ends to be considered a swipe.
• PressThreshold: Point at which the pointer moved too much to consider it a tap or long press gesture.
• DiagonalSwipes: If true, swiping in a diagonal direction will fire both a horizontal and a vertical swipe.
• DiagonalLimit: The degree limit to consider a diagonal swipe when DiagonalSwipes is true.
• MouseSupport: Listen to mouse events in addition to touch events (for desktop support).

License

This project is licensed under the MIT License. See the LICENSE file for details.

Acknowledgements

This wrapper is built on top of the TinyGesture library.