Nine Slice Component

Nine-slice, also known as 9-slice, is a way to preserve the edges of an image while scaling it to the desired size.

This component is very useful where your image/button/background has special corners, drop shadow edges, borders or other corner/edge features. Edge detail is retained even when the image is resized to fit a certain space. It stops stretching of the sides of your image when you re-size it or it displays on different devices.

Using the Nine Slice

  • The Nine Slice takes you straight to browse your App’s ‘images’ folder in order to insert the asset you want to edit the slice values of. It inserts the asset into the Preview panel and the Nine slicer.
  • The Nine Slice is pre-set to slice each side at 30 pixels. ( Distorted corners will result, for example, when each dial is set to 0 pixels.)
  • Adjust the dials to preserve the 4 edges/corners of your image as you want them to display. You can resize the preview image at any stage to check it retains the shape you want. Save the desired result
  • These slice values can be reset at any stage, using the Nine Slice value button to edit the values again and re-save.

http://help.umajin.com/nine-slice-tutorial/

Properties for Nine Slice Component

Name When components are placed on a page they appear highlighted blue in the scene tree and can be renamed by double clicking in this panel and typing the new name. Components can also be set to be visible/invisible on the page, using the ‘eye’ icon on this panel.
Position and Size Sets position and size. As long as measurements are maintained as percentages it deals automatically with dynamic layout and resizing for different devices and orientations. You can use millimeters to control aspects of size like width or height in order to create an image that will be well positioned across devices.
Appearance
Image This field is automatically filled with the image filename you selected initially.
Nine Slice Values Clicking the “edit values’ button will take you to the Nine Slicer page.  Change the sliders to preserve edges and corners in correct proportions and save the result.
Border Scale Proportionally scales the sides, edges and corners of the nine slice image that are set in the editable values of the image used as a base for the component.
Border Padding Pads the nine slice inside to outside the object bounds.  This is useful when the nine slice object is snapped to another object and the border needs to be either internal or external of the bound object. Scales between 0 and 50.
Opacity Set how opaque the image will display on a scale of 0 to 100, with 0 being transparent and 100 is completely opaque.