SpriteLayer QML Type

A sprite layer which can contain multiple image and item layers. More...

• List of all members, including inherited members

Properties

• depth : enumeration
• platformId : int

Detailed Description

A sprite layer can contain multiple image and item layers, which are then called sprites or sub-layers.

Most hardware platforms limit the no. of root layers that an application can have. You can overcome this by using sprite layers that contain a number of smaller layers to save memory. Although the sprite layers are useful, they do come with the following limitations:

• There's a limited number of sub-layers per sprite layer, typically eight or less
• Opacity will be ignored for the sub-layers.
• Overlapping sub-layers are not blended together, showing only the pixel from the top-most sub-layer.
• On the Renesas RH850 platform:
  • Color depth of the sprite must be compatible with the hardware layer.
  • The X position of a sprite is rounded to a multiple of two pixels for layers with 32 bit color depth, and four pixels for layers with 16 bit color depth.

SpriteLayer items have to be contained inside a Screen item.

Example usage:

ApplicationScreens {
    Screen {
        SpriteLayer {
            x: 10
            y: 60

            width: 100
            height: 100

            ImageLayer {
                y: 20
                source: "qrc:/images/splash.png"
            }

            ItemLayer {
                y: 40

                width: 100
                height: 60

                Text {
                    text: "Hello World"
                    anchors.centerIn: parent
                }
            }
        }
    }
}

See also ApplicationScreens, Screen, ImageLayer, ItemLayer, and Improving performance using hardware layers.

Property Documentation

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