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Helpers/Picker/SelectionHandles.qml

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+pragma ComponentBehavior: Bound
+
+import QtQuick
+
+Item {
+	id: root
+
+	property color handleBorder: "#3584e4"
+	property color handleFill: "white"
+	property real hs: 12
+	property real minSize: 24
+	required property real selH
+	required property real selW
+	required property real selX
+	required property real selY
+
+	signal boundsChanged(x: real, y: real, w: real, h: real)
+	signal dragFinished
+	signal moveBy(dx: real, dy: real)
+
+	height: selH
+	width: selW
+	x: selX
+	y: selY
+
+	DragHandler {
+		id: moveHandler
+
+		property real accumX: 0
+		property real accumY: 0
+
+		target: null
+
+		onActiveChanged: {
+			accumX = 0;
+			accumY = 0;
+			if (!active)
+				root.dragFinished();
+		}
+		onTranslationChanged: {
+			const t = moveHandler.translation;
+			root.moveBy(t.x - accumX, t.y - accumY);
+			accumX = t.x;
+			accumY = t.y;
+		}
+	}
+
+	Handle {
+		edge: "tl"
+		x: -root.hs / 2
+		y: -root.hs / 2
+	}
+
+	Handle {
+		edge: "t"
+		x: root.width / 2 - root.hs / 2
+		y: -root.hs / 2
+	}
+
+	Handle {
+		edge: "tr"
+		x: root.width - root.hs / 2
+		y: -root.hs / 2
+	}
+
+	Handle {
+		edge: "r"
+		x: root.width - root.hs / 2
+		y: root.height / 2 - root.hs / 2
+	}
+
+	Handle {
+		edge: "br"
+		x: root.width - root.hs / 2
+		y: root.height - root.hs / 2
+	}
+
+	Handle {
+		edge: "b"
+		x: root.width / 2 - root.hs / 2
+		y: root.height - root.hs / 2
+	}
+
+	Handle {
+		edge: "bl"
+		x: -root.hs / 2
+		y: root.height - root.hs / 2
+	}
+
+	Handle {
+		edge: "l"
+		x: -root.hs / 2
+		y: root.height / 2 - root.hs / 2
+	}
+
+	component Handle: Rectangle {
+		id: handle
+
+		required property string edge
+
+		border.color: root.handleBorder
+		border.width: 2
+		color: root.handleFill
+		height: root.hs
+		radius: root.hs / 2
+		width: root.hs
+		z: 10
+
+		HoverHandler {
+			cursorShape: {
+				switch (handle.edge) {
+				case "tl":
+				case "br":
+					return Qt.SizeFDiagCursor;
+				case "tr":
+				case "bl":
+					return Qt.SizeBDiagCursor;
+				case "t":
+				case "b":
+					return Qt.SizeVerCursor;
+				default:
+					return Qt.SizeHorCursor;
+				}
+			}
+		}
+
+		DragHandler {
+			id: dh
+
+			property real startH
+			property real startW
+			property real startX
+			property real startY
+
+			grabPermissions: PointerHandler.CanTakeOverFromAnything | PointerHandler.TakeOverForbidden
+			target: null
+
+			onActiveChanged: {
+				if (active) {
+					startX = root.x;
+					startY = root.y;
+					startW = root.width;
+					startH = root.height;
+				} else {
+					root.dragFinished();
+				}
+			}
+			onTranslationChanged: {
+				const delta = dh.translation;
+				const e = handle.edge;
+				let nx = startX, ny = startY, nw = startW, nh = startH;
+
+				if (e.includes("l")) {
+					nx = startX + delta.x;
+					nw = startW - delta.x;
+				}
+				if (e.includes("r")) {
+					nw = startW + delta.x;
+				}
+				if (e.includes("t")) {
+					ny = startY + delta.y;
+					nh = startH - delta.y;
+				}
+				if (e.includes("b")) {
+					nh = startH + delta.y;
+				}
+
+				if (nw < root.minSize) {
+					if (e.includes("l"))
+						nx = startX + startW - root.minSize;
+					nw = root.minSize;
+				}
+				if (nh < root.minSize) {
+					if (e.includes("t"))
+						ny = startY + startH - root.minSize;
+					nh = root.minSize;
+				}
+
+				root.boundsChanged(nx, ny, nw, nh);
+			}
+		}
+	}
+}