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Comment:Started TIP 570: gesture support for finger scrolling and "pinch to zoom"
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SHA3-256: 46186ab75576e9ad16736d0b9daf9bcc70557910de38f86323e291e254421128
User & Date: oehhar 2020-03-18 15:56:41
Context
2020-03-18
15:58
Put target Tk Version in field Tcl-Version check-in: d716397efe user: oehhar tags: trunk
15:56
Started TIP 570: gesture support for finger scrolling and "pinch to zoom" check-in: 46186ab755 user: oehhar tags: trunk
2020-03-16
23:37
Update 552 to match latest cellselection implementation check-in: f08d8e2da6 user: pspjuth tags: trunk
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# TIP 570: gesture support for finger scrolling and "pinch to zoom"
	Author:         Harald Oehlmann <[email protected]>
	State:          Draft
	Type:           Project
	Vote:           Done
	Created:        18-Mar-2020
	Post-History:
	Keywords:       Tk, bindings
	Tk-Version:    8.7
-----

# Abstract

Support for the gestures "finger scroll" and "pinch to zoom" are proposed in a platform neutral way.

This tip is not ready specified yet.
Anybody is invited to contribute.

# Specification

## Overview

Many systems (e.g. Windows, Linux Window Manager, Mac-OS, Android) nowdays support gestures in a generic manner.
The gestures may be different and the input media may be different.
Possible input media are a touch-screen or a touchpad.

The aim of this TIP is to make gestures provided by the system available within Tk.

The targeted gestures are:

   *   scrolling, for example by pointing two fingers on the touch-screen and moving it. This is often identical to the pan gesture.
   *   zooming, for example by pinching two fingers on a touch-screen.

There is a direct relation to the displayed image if a touch-screen is used.
The scroll gesture gives a source and target point on the screen.

## Platforms

The following discussion is about possible implementations on different platforms

### Windows

Peter Spjuth has authored a Windows implementation in tk.branch pspjuth-touch: [https://core.tcl-lang.org/tk/timeline?r=pspjuth-touch]

The two gestures are implemented by the following virtual bind tags:

   *   Zoom: "<<PinchToZoom>> %W %d %x %y %X %Y" : W: Window(below the fingers), d: descriptive dict (gesture =zoom, distance=finger distance), x,y: position.
   *   Scroll: "<<Gesture>> %W %d %x %y %X %Y": Window(below the fingers), d: descriptive dict (gesture=pan, distance=finger distance > 0 for two fingers), x,y: position

### AndroWish

Christian Werner has defined the following virtual binding tags.
This information is copied from [http://www.androwish.org/home/wiki?name=sdltk+command].

   *   Zoom: "<<PinchToZoom>> %X %Y %x %y %s" : %X and %Y are substituted with the root window coordinate of the center of the two fingers, %x with the distance between the two fingers, and %y with the angle measured in 64 times degrees CCW starting at 3 o'clock. The finger state is reported in the %s substitution as 0 (zoom motion), 1 (zoom start, i.e. 2nd finger down event), 2 (zoom end by 1st finger up event), 3 (zoom end by 2nd finger up event)
   *   Scroll: "<<FingerDown>>, <<FingerUp>>, <<FingerMotion>>" : Scrolling by two fingers may be implemented by observing those events. Documentation: A touch movement (sliding) event. The fields %x and %y are substituted with the finger position scaled to {0...9999} of the device screen or viewport, %X and %Y with the motion difference scaled to {-9999...+9999}, %t with the pressure scaled to {0...9999}, and %s with the finger identifier {1...10}. These substitutions are performed for all finger related touch events. 

### Linux

### Mac-OS

# Rationale


# Implementation

The following fragments are known:

   *   tk.branch pspjuth-touch: [https://core.tcl-lang.org/tk/timeline?r=pspjuth-touch]
   *   AndroWish

# Discussion


# Copyright

This document has been placed in the public domain.