overhauled navigation, it doesn't suck now

2026-08-09 23:47:10 -05:00
parent f70e9b0b08
commit 75f0cbded6
3 changed files with 199 additions and 40 deletions
@@ -0,0 +1,139 @@
+import QtQuick
+import NomadInput 1.0
+
+QtObject {
+    id: manager
+
+    property Item rootItem: null
+    property list<QtObject> items
+    property var currentItem: null
+
+    function focusItem(item) {
+        if (!item) {
+            return
+        }
+
+        currentItem = item 
+
+        if (typeof item.navFocus === "function") {
+            item.navFocus()
+        }
+    }
+
+    function registerItem(item) {
+        if (!item) {
+            return
+        }
+
+        for (let i = 0; i < items.length; i++) {
+            if (items[i] === item) {
+                return
+            }
+        }
+
+        items.push(item)
+    }
+
+    function unregisterItem(item) {
+        if (!item) {
+            return
+        }
+
+        for (let i = 0; i < items.length; i++) {
+            if (items[i] === item) {
+                items.splice(i, 1)
+
+                if (currentItem === item) {
+                    currentItem = null
+                }
+
+                return;
+            }
+        }
+    }
+
+    function move(action) {
+        if (!currentItem || !rootItem) {
+            return
+        }
+
+        let dx = 0
+        let dy = 0
+
+        switch(action) {
+        case InputManager.Left:
+            dx = -1
+            break
+
+        case InputManager.Right:
+            dx = 1
+            break
+
+        case InputManager.Up:
+            dy = -1
+            break
+
+        case InputManager.Down:
+            dy = 1
+            break
+
+        default:
+            return
+        }
+
+        let currentCenter = currentItem.mapToItem(rootItem, currentItem.width / 2, currentItem.height / 2)
+
+        let bestItem = null 
+        let bestScore = Infinity
+
+        for (let i = 0; i < items.length; i++) {
+            let candidate = items[i]
+
+            if (!candidate) {
+                continue
+            }
+
+            if (candidate === currentItem) {
+                continue
+            }
+
+            if (!candidate.visible || !candidate.enabled) {
+                continue
+            }
+
+            let candidateCenter = candidate.mapToItem(rootItem, candidate.width / 2, candidate.height / 2)
+
+            let differenceX = candidateCenter.x - currentCenter.x 
+            let differenceY = candidateCenter.y - currentCenter.y 
+
+            let forwardDistance
+            let sidewaysDistance
+
+            if (dx !== 0) {
+                forwardDistance = differenceX * dx 
+                sidewaysDistance = Math.abs(differenceY)
+            } else {
+                forwardDistance = differenceY * dy
+                sidewaysDistance = Math.abs(differenceX)
+            }
+
+            if (forwardDistance <= 0) {
+                continue
+            }
+
+            let score = forwardDistance + sidewaysDistance * 2
+
+            if (score < bestScore) {
+                bestScore = score
+                bestItem = candidate
+            }
+            console.log("candidate:", candidate, "center:", candidateCenter.x, candidateCenter.y, "difference:", differenceX, differenceY)
+        }
+
+        if (bestItem) {
+            focusItem(bestItem)
+        }
+
+        console.log("MOVE", inputManager.actionName(action), "current:", currentItem, "center:", currentCenter.x, currentCenter.y)
+    }
+}