Camera Events

This event is invoked for every widget when the widget position and dimensions are computed. This event is invoked for all the widgets placed inside flex containers. This event is invoked in the order in which the widgets are added to the widget hierarchy and expect the frame property of the widget is calculated and available for use within this event.

Syntax

doLayout()

Read/Write

Read + Write

Remarks

Note: The number of times this event invoked may vary per platform. It is not recommended to write business logic assuming that this function is invoked only once when there is a change in positional or dimensional properties. This event will not trigger when transformations are applied though widget is moved or scaled or rotated from its original location.

This event is used to set the layout properties of child widgets in the relation to self and peer widgets whose layout is not yet performed.

Example

//Sample code to set doLayout event callback to a button widget.
/*This code changes the top property of button2 and makes it appear below button1.*/
myForm.button1.doLayout=doLayoutButton1;


function doLayoutButton1(){
      
    myForm.button2.top = myForm.button1.frame.height;
}

Platform Availability

iOS
Android
Windows
SPA

onCapture Event

An event callback is invoked when the user captures a picture.

Syntax

onCapture()

Read/Write

Read + Write

Example

//Sample code to set onCapture event callback for Camera widget.

frmCamera.myCamera.onCapture=onCaptureCallBck;

function onCaptureCallBck(camera){
      
   //Write your code here.
}

Platform Availability

Available in the IDE.
Android
iOS
Windows
Desktop Web

onCaptureFailed Event

An event callback is invoked when the user has tapped on Don't Allow over permission alert and also when camera privacy is turned off under iPhone settings. If the user taps on Allow for the very first time it will immediately open the camera screen. Camera screen will not be shown until the user has set the permission. Callback will be invoked asynchronously when user selects Don't Allow over permission alert.

The camera permission alert shows up once in app lifecycle. Upgrading or deleting or reinstalling the app will not trigger the alert, if it has already been shown.

For subsequent camera access, onCaptureFailed is called with status as RESOURCE_ACCESS_STATUS_DENIED if the user has selected as Don't Allow for the first time or when camera privacy is turned off under iPhone settings.

Syntax

onCaptureFailed()

Read/Write

Read + Write

Example

//Sample code to set onCaptureFailed event callback for Camera widget.

frmCamera.myCamera.onCaptureFailed=onCaptureFailedCallBck;

function onCaptureFailedCallBck(camera){
      
   //Write your code here.
}

Platform Availability

Not available in the IDE.
iOS
Desktop Web

onFailure Event

An event callback is invoked when an error occurs using a camera widget. For example, you set a camera source, but it is not available on the device.

Syntax

onFailure()

Optional Parameters

source [widgetref]

Handle to the widget reference.

errorcode [Number]

Specifies the error code. The options are:

Error code	Platform	Description
constants.CAMERA_SOURCE_FRONT_UNAVAILABLE	iOS, Android, Desktop Web	When the front camera is not available.
constants.CAMERA_SOURCE_REAR_UNAVAILABLE	iOS, Android, Desktop Web	When the rear camera is not available.
constants.CAMERA_SOURCE_UNAVAILABLE	iOS, Android	When camera source is not available. It is useful when the cameraSource is configured as constants.CAMERA_SOURCE_DEFAULT
constants.CAMERA_PREVIEW_UNAVAILABLE	iOS, Android	When the camera preview is not available.
constants.CAMERA_CAPTURE_FAILED	iOS, Android, Desktop Web	When the camera failed to capture a video.
constants.CAMERA_VIDEO_LOW_DISC_SPACE	Android	When the disk space is low.
constants.CAMERA_VIDEO_RECORDING_FAILED	Android, Desktop Web	When a recording is failed.
constants.CAMERA_VIDEO_SAVE_FAILED	iOS	When the captured video cannot not be saved. For example, insufficient permission to the app to access camera.
constants.CAMERA_ACCESS_MODE_INMEMORY_DATA_RETRIEVE_FAILED	iOS	When the captured media cannot be held in memory because of size constraints.
constants.CAMERA_PERMISSION_DENIED	Desktop Web	When the user denies permission to access the device camera.
constants.CAMERA_NOT_SUPPORTED	Desktop Web	When the web browser does not have camera support.

Read/Write

Read + Write

Example

//Sample code to set onFailure event callback for Camera widget.

frmCamera.myCamera.onFailure=onFailureCallBck;

function onFailureCallBck(camera, errorcode){
      
   //Write your code here.
}

Platform Availability

Not available in the IDE
iOS
Android
Desktop Web

onImageSaveFailed Event

An event callback is invoked when the user has performed some action over permission alert and also when image cannot be saved to photo album or due to data save error.

Syntax

onImageSaveFailed()

Read/Write

Read + Write

Example

//Sample code to set onImageSaveFailed event callback for Camera widget.

frmCamera.myCamera.onImageSaveFailed=onImageSaveFailedCallBck;

function onImageSaveFailedCallBck(camera, status){
      
   //Write your code here.
}

Platform Availability

Not available in the IDE.

Available on iOS platform.

onTouchEnd Event

An event callback is invoked by the platform when the user touch is released from the touch surface.

Syntax

onTouchEnd ()

Optional Parameters

source

Handle to the widget reference on which the user touch has ended.

x

Specifies the x-coordinate with in the widget with respect to widget's co-ordinate system. It is a number indicating device independent pixel.

y

Specifies the y- coordinate with in the widget with respect to widget's co-ordinate system. It is a number indicating device independent pixel.

contextInfo

On devices that support 3D Touch, specifies a key-value pair where the value specifies the force of the touch. The value 1.0 represents the force of an average touch, as determined by the system.

Note: 3D Touch is available only on iOS 9.0 and later.

Read/Write

Read + Write

Remarks

This event is invoked asynchronously.

Example

function onTouchEndCallback(source, x, y, contextInfo) {
    if (contextInfo) {
        var force = contextInfo[“force”];
        kony.print(“value of force is” + force)
    }
}
Form1.widget1.onTouchEnd = onTouchEndCallback;

Platform Availability

iOS, Android, Windows, and SPA

onTouchMove Event

An event callback is invoked by the platform when the touch moves on the touch surface continuously until movement ends.

Syntax

onTouchMove ()

Optional Parameters

source

Handle to the widget reference on which touch moves.

x

Specifies the x-coordinate with in the widget with respect to widget's co-ordinate system. It is a number indicating device independent pixel.

y

Specifies the y- coordinate with in the widget with respect to widget's co-ordinate system. It is a number indicating device independent pixel.

contextInfo

On devices that support 3D Touch, specifies a key-value pair where the value specifies the force of the touch. The value 1.0 represents the force of an average touch, as determined by the system.

Note: 3D Touch is available only on iOS 9.0 and later.

Read/Write

Read + Write

Remarks

This event is invoked asynchronously.

Example

function onTouchMoveCallback(source, x, y, contextInfo) {
    if (contextInfo) {
        var force = contextInfo[“force”];
        kony.print(“value of force is” + force)
    }
    Form1.widget1.onTouchMove = onTouchMoveCallback;

Platform Availability

iOS, Android, Windows, and SPA

onTouchStart Event

An event callback is invoked by the platform when the user touches the touch surface.

Syntax

onTouchStart ()

Optional Parameters

source

Handle to the widget reference on which the user touches.

x

Specifies the X co-ordinate with in the widget with respect to widget's co-ordinate system. It is a number indicating device independent pixel.

y

Specifies the Y co-ordinate with in the widget with respect to widget's co-ordinate system. It is a number indicating device independent pixel.

contextInfo

On devices that support 3D Touch, specifies a key-value pair where the value specifies the force of the touch. The value 1.0 represents the force of an average touch, as determined by the system.

Note: 3D Touch is available only on iOS 9.0 and later.

Read/Write

Read + Write

Remarks

This event is invoked asynchronously.

Example

function onTouchStartCallback(source, x, y, contextInfo) {
    if (contextInfo) {
        var force = contextInfo[“force”];
        kony.print(“value of force is” + force)
    }
}
Form1.widget1.onTouchStart = onTouchStartCallback;

Platform Availability

iOS, Android, Windows, and SPA