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  • Overview
  • Describing the Image control: Options specific to the multi-touch
  • Optional events specific to multi-touch
  • Scroll with finger optional event
  • "Inertial scroll (Fling)" optional event
  • Horizontal and vertical swipe
  • "Zoom with fingers" optional process
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Stored procedures
Overview
One of the most common applications of the multi-touch feature is used to handle images. The display size on a phone being reduced, it is often necessary to zoom an image and/or to move inside an image.
This allows you to perform a zoom on an image via the contact of 2 fingers moving apart.
The multi-touch can be implemented:
  • on the applications run on a phone.
  • on the sites displayed on a phone.
The management of multi-touch in the Image controls can be implemented via:
Versions 19 and later
WEBDEV - Server codeWEBDEV - Browser code This feature is now available for the WEBDEV sites.
WEBDEV - Server codeWEBDEV - Browser code Use conditions:
  • On the default Android browser, the multi-touch is supported from Android version 3.0 and later.
  • On the default Android browser, the zoom of gestures may conflict with the default zoom of the browser for the versions earlier than Android 4.3.
New in version 19
WEBDEV - Server codeWEBDEV - Browser code This feature is now available for the WEBDEV sites.
WEBDEV - Server codeWEBDEV - Browser code Use conditions:
  • On the default Android browser, the multi-touch is supported from Android version 3.0 and later.
  • On the default Android browser, the zoom of gestures may conflict with the default zoom of the browser for the versions earlier than Android 4.3.
WEBDEV - Server codeWEBDEV - Browser code This feature is now available for the WEBDEV sites.
WEBDEV - Server codeWEBDEV - Browser code Use conditions:
  • On the default Android browser, the multi-touch is supported from Android version 3.0 and later.
  • On the default Android browser, the zoom of gestures may conflict with the default zoom of the browser for the versions earlier than Android 4.3.
Describing the Image control: Options specific to the multi-touch
The "Details" tab in the window description of the Image control is used to manage the actions performed when using the fingers:
You have the ability to manage:
  • No scroll, no zoom: in this case, the multi-touch is disabled.
  • Automatic scroll only: If the image is not entirely displayed in the control, you have the ability to move it by scrolling in the image with the finger.
  • Automatic scroll and zoom: A zoom can be performed in addition to the scroll. In this case:
    • spreading out two fingers in contact with the screen is used to perform a zoom in. The zoom will be centered on the point found in the middle of the line drawn by the two contact points.
    • tightening the two fingers in contact with the screen is used to perform a zoom out.
The additional options are used to define:
  • Maximum zoom factor: Maximum zoom that can be performed with the fingers.
  • Allow the scaling by double tap: In this case, a double tap (or double click) performed in the control is used to apply the zoom on an image section. If the image is already zoomed, it is reinitialized to its initial display.
Optional events specific to multi-touch
There are three specific optional events to manage multi-touch on Image controls:
WEBDEV - Server codeWEBDEV - Browser code Note: These are browser events.

Scroll with finger optional event

The "Scroll with finger" event is run when one or more fingers move vertically or horizontally while in contact with the screen
This event can accept parameters by declaring a procedure directly in the event "Scroll with finger" with the following syntax:
PROCEDURE <Procedure name>(<Distance X>, <Distance Y>)
where:
  • <Distance X>: Integer corresponding to the distance (in pixels) that was scrolled on the X axis in the control.
  • <Distance Y>: Integer corresponding to the distance (in pixels) that was scrolled on the Y axis in the control.
Notes:
  • WEBDEV - Browser code The distance corresponds to the distance between the first contact point that was detected and the current position.
Versions 18 and later
WEBDEV - Browser code To find out the direction and the distance for the operation performed, you have the ability to use the Gesture variable instead of the procedure.
New in version 18
WEBDEV - Browser code To find out the direction and the distance for the operation performed, you have the ability to use the Gesture variable instead of the procedure.
WEBDEV - Browser code To find out the direction and the distance for the operation performed, you have the ability to use the Gesture variable instead of the procedure.

"Inertial scroll (Fling)" optional event

The "Inertial scrolling" event is run during a quick little movement of one or more fingers on the screen.
This event can accept parameters by declaring a procedure directly in the event "Inertial scroll" with the following syntax:
PROCEDURE <Procedure name>(<Speed X>, <Speed Y>)
where:
  • <Speed X>: Integer corresponding to the speed (in pixels per second) of the movement on the X axis.
  • <Speed Y>: Integer corresponding to the speed (in pixels per second) of the movement on the Y axis.

Horizontal and vertical swipe

The "Horizontal and vertical swipe" event is run during a quick small movement of one or more fingers on the screen.
This event can accept parameters by declaring a procedure directly in the event "Horizontal and vertical swipe" with the following syntax:
PROCEDURE <Procedure name>(<Speed X>, <Speed Y>)
where:
  • <Speed X>: Integer corresponding to the speed (in pixels per second) of the movement on the X axis.
  • <Speed Y>: Integer corresponding to the speed (in pixels per second) of the movement on the Y axis.
Versions 18 and later
WEBDEV - Browser code To find out the direction and the speed for the operation performed, you have the ability to use the Gesture variable instead of the procedure.
New in version 18
WEBDEV - Browser code To find out the direction and the speed for the operation performed, you have the ability to use the Gesture variable instead of the procedure.
WEBDEV - Browser code To find out the direction and the speed for the operation performed, you have the ability to use the Gesture variable instead of the procedure.

"Zoom with fingers" optional process

The "Zoom with fingers" event is run with a pinch or spread finger gesture on the screen.
This event can accept parameters by declaring a procedure directly in the event "Zoom with fingers" with the following syntax:
PROCEDURE <Procedure name>(<Spacing>)
where <Spacing>: Integer corresponding to the distance (in pixels) between the two contact points when the event was called.
Versions 18 and later
WEBDEV - Browser code To find out the spacing, you have the ability to use the Gesture variable instead of the procedure.
New in version 18
WEBDEV - Browser code To find out the spacing, you have the ability to use the Gesture variable instead of the procedure.
WEBDEV - Browser code To find out the spacing, you have the ability to use the Gesture variable instead of the procedure.
Caution: The zoom with finger is not available if dStartDrawing is used on the Image control. In this case, you must:
  • save the image with a dSaveImageXXX function.
  • use dEndDrawing.
  • redisplay the image in the Image control.
Related Examples:
Android System Android (WINDEV Mobile): Android System
[ + ] This application is a tutorial example presenting some of the new features of WINDEV Mobile for Android.
The following system functions are used:
- NFC
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- WIFI
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- Toast
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iOS System iPhone/iPad (WINDEV Mobile): iOS System
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The features are as follows:
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Minimum version required
  • Version 17
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