115 lines
3.7 KiB
QML
115 lines
3.7 KiB
QML
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import QtQuick
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// Небольшое полотно графа связей: узлы-файлы (синие) и теги (зелёные),
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// рёбра — связи; узлы можно перетаскивать, клик по файлу открывает его.
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Canvas {
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id: g
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property var nodes: [] // [{key,name,type}]
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property var edges: [] // [{from,to}]
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signal fileClicked(string path)
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property var pos: ({}) // key -> {x,y}
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property string dragKey: ""
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function nodeForKey(key) {
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for (let i = 0; i < nodes.length; ++i)
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if (nodes[i].key === key) return nodes[i]
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return null
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}
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function relayout() {
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pos = {}
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const n = nodes.length
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if (n === 0) return
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const cx = width / 2, cy = height / 2
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const rad = Math.min(width, height) / 2 - 30
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for (let i = 0; i < n; ++i) {
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const a = (i / n) * 2 * Math.PI - Math.PI / 2
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pos[nodes[i].key] = { x: cx + rad * Math.cos(a), y: cy + rad * Math.sin(a) }
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}
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requestPaint()
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}
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onNodesChanged: relayout()
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onWidthChanged: relayout()
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onHeightChanged: relayout()
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onPaint: {
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const ctx = getContext("2d")
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ctx.clearRect(0, 0, width, height)
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if (nodes.length === 0) return
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// рёбра
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ctx.lineWidth = 1
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ctx.strokeStyle = "#b9c6d6"
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for (let i = 0; i < edges.length; ++i) {
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const f = pos[edges[i].from]
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const t = pos[edges[i].to]
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if (!f || !t) continue
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ctx.beginPath()
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ctx.moveTo(f.x, f.y)
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ctx.lineTo(t.x, t.y)
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ctx.stroke()
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}
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// узлы
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ctx.textAlign = "center"
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for (let i = 0; i < nodes.length; ++i) {
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const nd = nodes[i]
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const p = pos[nd.key]
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if (!p) continue
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const isFile = nd.type === "file"
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const r = isFile ? 6 : 5
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ctx.beginPath()
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ctx.arc(p.x, p.y, r, 0, 2 * Math.PI)
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ctx.fillStyle = isFile ? (nd.key === g.dragKey ? "#1a6ce0" : "#3f7fd0")
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: "#3aa06a"
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ctx.fill()
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ctx.strokeStyle = "#ffffff"
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ctx.lineWidth = 1
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ctx.stroke()
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ctx.fillStyle = "#5a6a7d"
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ctx.font = "9px sans-serif"
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const label = isFile ? nd.name : nd.name
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const txt = label.length > 14 ? label.substring(0, 13) + "…" : label
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ctx.fillText(txt, p.x, p.y + r + 10)
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}
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}
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MouseArea {
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anchors.fill: parent
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onPressed: (m) => {
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dragKey = ""
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for (const key in g.pos) {
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const p = g.pos[key]
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const dx = m.x - p.x, dy = m.y - p.y
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if (dx * dx + dy * dy <= 144) { // радиус захвата 12px
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dragKey = key
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break
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}
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}
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}
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onPositionChanged: (m) => {
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if (dragKey.length > 0 && g.pos[dragKey]) {
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g.pos[dragKey] = { x: m.x, y: m.y }
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g.requestPaint()
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}
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}
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onReleased: (m) => {
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if (dragKey.length === 0) {
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for (const key in g.pos) {
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const p = g.pos[key]
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const dx = m.x - p.x, dy = m.y - p.y
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if (dx * dx + dy * dy <= 100) {
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const nd = g.nodeForKey(key)
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if (nd && nd.type === "file")
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g.fileClicked(nd.key)
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break
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}
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}
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}
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dragKey = ""
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}
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}
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}
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