qt-everywhere-src-5.15.1/qtquickcontrols/src/extras/Styles/Flat/PieMenuStyle.qml

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import QtQuick 2.3
import QtQuick.Controls.Styles 1.4 as Base
import QtQuick.Controls.Styles.Flat 1.0
import QtQuick.Extras.Private 1.0

Base.PieMenuStyle {
    id: pieMenuStyle
    shadowRadius: 0
    shadowSpread: 0
    shadowColor: "transparent"
    backgroundColor: FlatStyle.styleColor
    selectionColor: FlatStyle.styleColor
    startAngle: -78
    endAngle: 78
    cancelRadius: radius * 0.4352

    __implicitWidth: Math.round(85 * 2 * FlatStyle.scaleFactor)
    __implicitHeight: __implicitWidth

    title: null

    menuItem: Item {
        readonly property var __styleData: styleData

        Canvas {
            id: actionCanvas
            antialiasing: true
            anchors.fill: parent
            anchors.margins: -1

            Connections {
                target: pieMenuStyle
                function onStartAngleChanged() { actionCanvas.requestPaint() }
                function onEndAngleChanged() { actionCanvas.requestPaint() }
            }

            Connections {
                target: __styleData
                function onPressedChanged() { actionCanvas.requestPaint() }
            }

            readonly property bool stroke: !__styleData.hovered
            readonly property real spacingThickness: Math.max(4 * FlatStyle.scaleFactor, radius * 0.05)
            // It's actually one, but stroking always goes 50/50 on the inside/outside, so this is
            // an easy way of making it one pixel without having to mess around with more drawing code.
            // This will work as long as the fill and stroke colors are both completely opaque.
            readonly property real lineWidth: FlatStyle.twoPixels
            // The following properties are all for either side of a radius/circumference, so the total is actually double.
            readonly property real outerMenuItemSpacing: Math.asin(spacingThickness / (2 * radius))
            readonly property real innerMenuItemSpacing: Math.asin(spacingThickness / (2 * cancelRadius))
            // The total angle to subtract from the circumference of the inner radius arc
            readonly property real innerRadiusStrokeCircumferenceAdjustment: Math.asin(lineWidth / (2 * cancelRadius))
            readonly property real outerRadiusStrokeCircumferenceAdjustment: Math.asin(lineWidth / (2 * radius))

            onStrokeChanged: actionCanvas.requestPaint()

            function drawRingSection(ctx, x, y, section, r, ringWidth, ringColor) {
                if (stroke) {
                    ctx.strokeStyle = ringColor;
                    ctx.fillStyle = "white";
                } else {
                    ctx.fillStyle = ringColor;
                }

                ctx.beginPath();

                if (stroke)
                    ctx.lineWidth = lineWidth;
                var start = control.__protectedScope.sectionStartAngle(section);
                var end = control.__protectedScope.sectionEndAngle(section);
                // Adjust the radius to account for stroke being 50% inside/50% outside.
                var radius = !stroke ? r : r - ctx.lineWidth / 2;
                // Add spacing between the items, while still accounting for reversed menus.
                if (start > end) {
                    start -= outerMenuItemSpacing;
                    end += outerMenuItemSpacing;
                    if (stroke) {
                        start -= outerRadiusStrokeCircumferenceAdjustment;
                        end += outerRadiusStrokeCircumferenceAdjustment;
                    }
                } else {
                    start += outerMenuItemSpacing;
                    end -= outerMenuItemSpacing;
                    if (stroke) {
                        start += outerRadiusStrokeCircumferenceAdjustment;
                        end -= outerRadiusStrokeCircumferenceAdjustment;
                    }
                }

                ctx.arc(x, y, radius, start, end, start > end);

                start = control.__protectedScope.sectionStartAngle(section);
                end = control.__protectedScope.sectionEndAngle(section);
                radius = !stroke ? ringWidth : ringWidth + ctx.lineWidth / 2;
                if (start > end) {
                    start -= innerMenuItemSpacing;
                    end += innerMenuItemSpacing;
                    if (stroke) {
                        start -= innerRadiusStrokeCircumferenceAdjustment;
                        end += innerRadiusStrokeCircumferenceAdjustment;
                    }
                } else {
                    start += innerMenuItemSpacing;
                    end -= innerMenuItemSpacing;
                    if (stroke) {
                        start += innerRadiusStrokeCircumferenceAdjustment;
                        end -= innerRadiusStrokeCircumferenceAdjustment;
                    }
                }

                ctx.arc(x, y, radius, end, start, start <= end);
                ctx.closePath();

                if (stroke)
                    ctx.stroke();

                ctx.fill();
            }

            onPaint: {
                var ctx = getContext("2d");
                ctx.reset();
                drawRingSection(ctx, width / 2, height / 2, styleData.index, radius, cancelRadius,
                    __styleData.pressed ? FlatStyle.pressedColorAlt : (stroke ? backgroundColor : selectionColor));
            }
        }

        PieMenuIcon {
            control: pieMenuStyle.control
            styleData: __styleData
        }
    }
}