Photocam

This feature is supported in mobile applications only.

The photocam component displays high resolution photos taken from digital cameras. It provides a way to zoom the photo, load it quickly, and fit it nicely on the screen. It is optimized for the .jpeg image format and has a low memory footprint.

The photocam component implements the scroller interface, which means that scroller functions can be used with the photocam component.

For more information, see the Photocam API.

Figure: Photocam hierarchy

Photocam hierarchy

Adding a Photocam Component

To create a photocam component, use the elm_photocam_add() function. You can set the image file with the elm_photocam_file_set() function.

Evas_Object *photocam;

photocam = elm_photocam_add(win);
elm_photocam_file_set(photocam, "/tmp/photo.jpeg");

Using the Photocam Zoom

To use the photocam zoom:

  • Set the zoom mode. You can select between 2 automatic and 1 manual zoom mode.

    To set the zoom mode to manual with a double zoom:

    elm_photocam_zoom_mode_set(photocam, ELM_PHOTOCAM_ZOOM_MODE_MANUAL);
elm_photocam_zoom_set(photocam, 2.0);

    If you use the ELM_PHOTOCAM_ZOOM_MODE_AUTO_FIT mode, the photo fits exactly inside the scroll frame with no pixels outside the region. In the ELM_PHOTOCAM_ZOOM_MODE_AUTO_FILL mode, all the pixels of the photocam component are filled.

  • Activate the multi-touch zoom by enabling gestures:

    elm_photocam_gesture_enabled_set(photocam, EINA_TRUE);

  • Zoom in on a specific region.

    To zoom in on a region starting at the coordinates (200 x 200) with a width of 400 px and a height of 300 px:

    elm_photocam_image_region_bring_in(photocam, 200, 200, 400, 300);

Using the Photocam Callbacks

To receive notifications about the photocam events, listen for the following signals:

  • clicked: The photo is clicked without dragging.
  • press: The photo is pressed.
  • longpressed: The photo is pressed down for a long time without dragging.
  • clicked,double: The photo is double-clicked.
  • load: The photo load begins.
  • loaded: The image file load is complete for the first view (a low resolution blurry version).
  • load,detail: A photo detailed data load begins.
  • loaded,detail: The image file load is complete for the detailed image data (a full resolution version).
  • zoom,start: The zoom animation starts.
  • zoom,stop: The zoom animation stops.
  • zoom,change: The zoom is changed when using an auto zoom mode.
  • scroll: The content is scrolled.
  • scroll,anim,start: The scrolling animation starts.
  • scroll,anim,stop: The scrolling animation stops.
  • scroll,drag,start: Dragging the content starts.
  • scroll,drag,stop: Dragging the content stops.

Note
The signal list in the API reference can be more extensive, but only the above signals are actually supported in Tizen.

In all cases, the event_info callback parameter is NULL.

To register and define a callback for the loaded signal:

void
message_port_cb(int local_port_id, const char *remote_app_id, bundle *message)
{
    evas_object_smart_callback_add(photocam, "loaded", loaded_cb, data);
}

/* Callback for the "loaded" signal */
/* Called when the photo file has been loaded in a low resolution */
void
loaded_cb(void *data, Evas_Object *obj, void *event_info)
{
    dlog_print(DLOG_INFO, LOG_TAG, "The photo has been loaded\n");
}

Note
Except as noted, this content is licensed under LGPLv2.1+.

  • Dependencies
    • Tizen 2.4 and Higher for Mobile
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