内容

• 特性
• 详细描述

SpriteLayer QML Type

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

• 所有成员列表，包括继承成员

特性

• depth : enumeration
• platformId : int

详细描述

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.

用法范例：

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
        }
    }
}
						

注意： This type is specific to Qt Quick Ultralite. See also the compatibility 页面。

另请参阅 应用程序 , Screen , ImageLayer , ItemLayer ，和 使用硬件层改善性能 .

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