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++ // Copyright (C) 2021 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ import QtQuick
++ import QtQuick.VirtualKeyboard
++
++ /*!
++ \qmltype FlickKey
++ \inqmlmodule QtQuick.VirtualKeyboard.Components
++ \ingroup qmlclass
++ \ingroup qtvirtualkeyboard-components-qml
++ \ingroup qtvirtualkeyboard-key-types
++ \inherits Key
++ \since 6.1
++
++ \brief Flick key for keyboard layouts.
++
++ Allows to enter an alternative character in a four-way gesture.
++ Characters are taken from the alternate keys starting with the
++ key at index \c 0 (excluding the main key text) and the positions
++ are filled in the following order: left, top, bottom, right.
++ */
++
++ Key {
++
++ property int __key
++ property string __text
++ property point pt1
++ readonly property real __centerRadius: width * 0.4
++ readonly property var flickKeys: {
++ var keys = InputContext.uppercase ? alternativeKeys.toUpperCase() : alternativeKeys.toLowerCase()
++ var textIndex = __text ? keys.indexOf(InputContext.uppercase ? __text.toUpperCase() : __text.toLowerCase()) : -1
++ if (textIndex === -1)
++ return keys
++ return keys.slice(0, textIndex).concat(keys.slice(textIndex + 1))
++ }
++ property string flickLeft: flickKeys.length > 0 ? flickKeys[0] : ""
++ property string flickTop: flickKeys.length > 2 ? flickKeys[1] : ""
++ property string flickBottom: flickKeys.length > 3 ? flickKeys[3] : (flickKeys.length > 2 ? flickKeys[2] : "")
++ property string flickRight: flickKeys.length > 3 ? flickKeys[2] : (flickKeys.length === 2 ? flickKeys[1] : "")
++
++ keyType: QtVirtualKeyboard.KeyType.FlickKey
++
++ Component.onCompleted: {
++ __key = key
++ __text = text
++ }
++
++ onActiveChanged: {
++ key = __key
++ text = __text
++ }
++
++ function __angle(pt2) {
++ var dx = pt2.x - pt1.x
++ var dy = pt2.y - pt1.y
++ var theta = Math.atan2(-dy, dx) * 360 / (2 * Math.PI)
++ var theta_normalized = theta < 0 ? theta + 360 : theta
++ return theta_normalized >= 360 ? 0 : theta_normalized
++ }
++
++ function __distance(pt2) {
++ var dx = pt2.x - pt1.x
++ dx = dx * dx
++ var dy = pt2.y - pt1.y
++ dy = dy * dy
++ return Math.sqrt(dx + dy)
++ }
++
++ function press(x, y) {
++ pt1 = Qt.point(x, y)
++ }
++
++ function update(x, y) {
++ var pt = Qt.point(x, y)
++ var distance = __distance(pt)
++ if (distance < __centerRadius) {
++ return
++ }
++ var currentText
++ var angle = __angle(pt)
++ if (angle < 45 || angle > 315) {
++ currentText = flickRight
++ } else if (angle < 135) {
++ currentText = flickTop
++ } else if (angle < 225) {
++ currentText = flickLeft
++ } else {
++ currentText = flickBottom
++ }
++ if (currentText.length === 1 && text !== currentText) {
++ key = currentText.toUpperCase().charCodeAt(0)
++ text = currentText
++ }
++ }
++ }