NumberAnimation QML Type

Animates changes in qreal-type values. 更多...

import 语句：	import QtQuick
继承：	PropertyAnimation
继承者：	SmoothedAnimation and SpringAnimation

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特性

• from : real
• to : real

详细描述

NumberAnimation is a specialized PropertyAnimation that defines an animation to be applied when a numerical value changes.

Here is a NumberAnimation applied to the x property of a Rectangle as a property value source. It animates the x value from its current value to a value of 50, over 1000 milliseconds:

import QtQuick
Rectangle {
    width: 100; height: 100
    color: "red"
    NumberAnimation on x { to: 50; duration: 1000 }
}
					

Like any other animation type, a NumberAnimation can be applied in a number of ways, including transitions, behaviors and property value sources. The Qt Quick 中的动画和过渡 documentation shows a variety of methods for creating animations.

Note that NumberAnimation may not animate smoothly if there are irregular changes in the number value that it is tracking. If this is the case, use SmoothedAnimation 代替。

另请参阅 Qt Quick 中的动画和过渡 and Qt Quick Examples - Animation .

特性文档编制

from : real

This property holds the starting value for the animation.

For example, the following animation is not applied until the x value has reached 100:

Item {
    states: [
        // ...
    ]
    transitions: Transition {
        NumberAnimation { properties: "x"; from: 100; duration: 200 }
    }
}
					

若 NumberAnimation is defined within a Transition or Behavior , this value defaults to the value defined in the starting state of the Transition , or the current value of the property at the moment the Behavior 被触发。

另请参阅 Qt Quick 中的动画和过渡 .

to : real

This property holds the end value for the animation.

若 NumberAnimation is defined within a Transition or Behavior , this value defaults to the value defined in the end state of the Transition , or the value of the property change that triggered the Behavior .

另请参阅 Qt Quick 中的动画和过渡 .

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