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QML Scrolling Digits/bg

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Български English


Как да направим скролиращи се числа

Ето един начин как бързо и лесно да направите скролиращи се числа.

https://www.youtube.com/watch?v=KLE4FdGc12U

Код

Първо създаваме компонент за всяка цифра:

Digit.qml

import QtQuick 1.1

Rectangle {
 id: digitItem
 width: size
 height: size

clip: true

gradient: Gradient {
 GradientStop {
 position: 0.0
 color: "black"
 }

GradientStop {
 position: 0.5
 color: "#222222"
 }

GradientStop {
 position: 1.0
 color: "black"
 }
 }

border.color: "black"
 border.width: 1

property int digit: 0
 property int size: 20

onDigitChanged: { digitPath.currentIndex = digit; }

PathView {
 id: digitPath

width: digitItem.size
 height: digitItem.size * 10

interactive: false

anchors.centerIn: parent

model: [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ]

delegate: Text {
 width: digitItem.size
 height: digitItem.size

text: modelData;

color: "white";

horizontalAlignment: Text.AlignHCenter;
 verticalAlignment: Text.AlignVCenter;

font.pointSize: digitItem.size-4;
 }

preferredHighlightBegin: 0.5
 preferredHighlightEnd: 0.5

path: Path {
 startX: digitPath.width / 2
 startY: 0

PathLine { x: digitPath.width / 2; y: digitPath.height }
 }
 }
}

Компонентът е един правоъгълник, в който центрираме PathView и включваме клипирането, за да виждаме само текущата цифра.

След това създавеме самия компонент за скролиращите се цифри:

ScrollingDigits.qml

import QtQuick 1.1

Row {
 id: scrollingDigits

property int number: 0
 property int positions: 5

Repeater {
 id: rep

model: scrollingDigits.positions

Digit {
 }
 }

onNumberChanged: {

var tmp = number

for( var i = 0; i < positions; ++i ) {
 rep.itemAt( positions - i - 1).digit = tmp % 10
 tmp = Math.floor( tmp / 10 )
 }
 }
}

Добавяме две нови свойства към Row елемента - number и positions . number съдържа числото, което искате да покажете, а position в колко позиции да се изписва.

Пример:

main.qml

import QtQuick 1.1

Rectangle {

width: 400
height: 400

color: "gray"

ScrollingDigits {

anchors.centerIn: parent

positions: 4

NumberAnimation on number {

from: 15; to: 100
duration: 50000
}
}

}