implement search bar functionality in settings

Modules/Settings/SettingsState.qml

@@ -8,14 +8,19 @@ QtObject {
 	property bool animatingContainer
 	property int currentPageIdx
 	property bool isWindow
+	property string lastAnchor
+	property list<int> pendingSubPath
 	property ShellScreen screen
+	property string searchAnchor
 	property bool searchOpen
+	property string searchText
 	property DesktopEntry selectedApp
 	property BluetoothDevice selectedBtDevice
 	property string selectedWallpaperCategory
 	property list<int> subPageIdxStack
 
 	signal close
+	signal highlightSetting(anchor: string)
 	signal subPageClosed
 	signal subPageOpened(idx: int)
 
@@ -24,10 +29,49 @@ QtObject {
 		subPageIdxStack.pop();
 	}
 
+	// Jump straight to a setting from search: open the page, then any sub-pages
+	// along subPath, then let the page scroll to the anchor. subPageIdxStack is
+	// filled directly so a freshly loaded StackPage opens the whole chain at
+	// once (see StackPage.Component.onCompleted), which avoids the half-open
+	// state that firing openSubPage signals one by one would cause.
+	function jumpToSetting(pageIdx: int, subPath: var, anchor: string): void {
+		const samePage = currentPageIdx === pageIdx;
+		const sameSub = subPageIdxStack.length === subPath.length && subPath.every((v, i) => subPageIdxStack[i] === v);
+		if (samePage && sameSub && anchor === lastAnchor) {
+			// Re-clicking the exact same setting: flash it again, don't scroll.
+			highlightSetting(anchor);
+			return;
+		}
+		lastAnchor = anchor;
+		if (samePage && sameSub) {
+			// Same page, different setting: just scroll to it.
+			searchAnchor = "";
+			searchAnchor = anchor;
+			return;
+		}
+		// Different page, or same page but different sub-page: point at the
+		// target sub-page chain and load the destination page, which scrolls to
+		// the anchor once it's ready.
+		searchAnchor = anchor;
+		if (!samePage) {
+			pendingSubPath = subPath.slice();
+			currentPageIdx = pageIdx;
+		} else {
+			// Same page: close back to the page root, then open the chain.
+			while (subPageIdxStack.length > 0)
+				closeSubPage();
+			for (let i = 0; i < subPath.length; i++)
+				openSubPage(subPath[i]);
+		}
+	}
+
 	function openSubPage(idx: int): void {
 		subPageIdxStack.push(idx);
 		subPageOpened(idx);
 	}
 
-	onCurrentPageIdxChanged: subPageIdxStack.length = 0
+	onCurrentPageIdxChanged: {
+		subPageIdxStack = pendingSubPath;
+		pendingSubPath = [];
+	}
 }