vicrodh
55ddc2c768
Accumulate wheel distance with short easing instead of kinetic acceleration. Preserve rapid and fractional wheel input, immediate direction changes, nested scroll chaining and scroll-memory takeover. Validated with 38 Qt Quick tests and desktop smoke testing. cx
110 lines
3.8 KiB
QML
110 lines
3.8 KiB
QML
// Custom vertical scrollbar — replica of primitives/ListScrollbar.slint.
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// 14px gutter (not over the rows), 6px #ffffff12 track, 8px thumb
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// (#ffffff44, widens to 10px / #ffffff77 on hover|drag), 48px min thumb,
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// auto-hide 900ms after the last scroll. Attach as a sibling anchored to
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// the right of a Flickable/GridView/ListView and set `target`.
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import QtQuick
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Item {
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id: root
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required property Flickable target
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/// Emitted only for a physical wheel/touchpad gesture or a press on this
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/// gutter, never when the target is positioned from code.
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signal userScrollStarted()
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width: 14
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visible: maxScroll > 0
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readonly property real maxScroll: Math.max(0, target.contentHeight - target.height)
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// ListView/GridView origins are not guaranteed to stay at zero when their
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// model or variable-size delegates change. Use the documented Flickable
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// coordinate (`contentY - originY`) for both drawing and seeking.
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readonly property real scrollY: Math.max(0, Math.min(maxScroll, target.contentY - target.originY))
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readonly property real thumbH: target.contentHeight > 0 ? Math.max(48, target.height / target.contentHeight * height) : height
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readonly property real travel: Math.max(0, height - thumbH)
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// Shown while scrolling, hovering, or dragging (auto-hide).
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property bool scrollActive: false
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readonly property bool shown: scrollActive || barArea.containsMouse || barArea.pressed
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Connections {
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target: root.target
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function onContentYChanged() {
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root.scrollActive = true;
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hideTimer.restart();
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}
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}
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Timer {
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id: hideTimer
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interval: 900
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onTriggered: root.scrollActive = false
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}
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// One shared input seam for every page that uses the house scrollbar:
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// wheel distance/easing and touchpad momentum share one input handler.
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QbzKineticScroll {
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id: wheelScroll
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target: root.target
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onUserScrollStarted: root.userScrollStarted()
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}
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// Track.
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Rectangle {
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width: 6
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x: Math.round((parent.width - width) / 2)
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height: parent.height
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radius: 3
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color: "#12ffffff"
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opacity: root.shown ? 1.0 : 0.0
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Behavior on opacity {
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NumberAnimation {
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duration: 160
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}
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}
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}
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// Thumb.
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Rectangle {
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width: barArea.containsMouse || barArea.pressed ? 10 : 8
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x: Math.round((parent.width - width) / 2)
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height: root.thumbH
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y: root.maxScroll > 0 ? (root.scrollY / root.maxScroll) * root.travel : 0
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radius: 5
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color: barArea.containsMouse || barArea.pressed ? "#77ffffff" : "#44ffffff"
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opacity: root.shown ? 1.0 : 0.0
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Behavior on width {
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NumberAnimation {
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duration: 100
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}
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}
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Behavior on opacity {
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NumberAnimation {
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duration: 160
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}
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}
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}
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// Drag / click-to-position over the whole gutter.
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MouseArea {
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id: barArea
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anchors.fill: parent
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hoverEnabled: true
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cursorShape: Qt.PointingHandCursor
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onPressed: {
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root.userScrollStarted();
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// Public Flickable semantics already cancel on a contentY write;
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// make the takeover explicit so scrollbar drag remains exact even
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// if the first pressed position equals the current one.
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wheelScroll.stopWheel();
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root.target.cancelFlick();
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position(mouseY);
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}
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onPositionChanged: if (pressed)
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position(mouseY)
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function position(my) {
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if (root.travel <= 0)
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return;
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var frac = Math.min(1, Math.max(0, (my - root.thumbH / 2) / root.travel));
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root.target.contentY = root.target.originY + frac * root.maxScroll;
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}
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}
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}
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