Bind layers tilesets

bind-layer-tileset.js

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+/*
+ * bind-layer-tileset.js
+ *
+ * This extension connects to signals emitted when selecting a layer of a tilemap, and a tile in a tileset
+ * It finds a corresponding tileset (resp layer of the active Tilemap) and selects it
+ * The match is done between tile layers and tilesets with exact same name
+ */
+
+/* global tiled */
+
+// recursive function that parses TileMaps and GroupLayers to search for a layer named targetName
+// code taken from user eishiya (https://github.com/eishiya) in this issue https://github.com/mapeditor/tiled/issues/3256
+function findLayer(curLayer, targetName) {
+	if(curLayer.isGroupLayer || curLayer.isTileMap) {
+		let numLayers = curLayer.layerCount;
+		for(let layerID = 0; layerID < numLayers; layerID++) {
+			let found = findLayer(curLayer.layerAt(layerID), targetName);
+			if(found)
+				return found;
+		}
+	} else if(curLayer.name == targetName)
+		return curLayer;
+
+	return null;
+}
+
+// change active TileMap layer based on the current TileSet
+function onTilesetChange() {
+	let map = tiled.activeAsset;
+	// only consier TileMap
+	if (!map.isTileMap) {
+		return;
+	}
+
+	// find layer corresponding to current Tileset
+	let targetName = tiled.mapEditor.tilesetsView.currentTileset.name;
+	let layer = findLayer(map, targetName);
+
+	// apply
+	if (layer) {
+		map.currentLayer = layer;
+	}
+}
+
+// change TileSet based on current layer
+function onLayerChanged(asset) {
+	let layer = asset.currentLayer;
+
+	// only consider tile layers
+	if (!layer.isTileLayer) {
+		return;
+	}
+
+	// find correspongind Tileset
+	let tileSet = undefined;
+	for (let ts of asset.tilesets) {
+		if (ts.name == layer.name) {
+			tileSet = ts;
+			break;
+		}
+	}
+
+	// apply
+	if (tileSet) {
+		tiled.mapEditor.tilesetsView.currentTileset = tileSet;
+	}
+}
+
+// do the binding for a TileMap
+function bindTileSetToLayer(asset) {
+	// only work on TileMap
+	if (!asset || !asset.isTileMap) {
+		return;
+	} 
+
+	asset.currentLayerChanged.connect(() => {
+		onLayerChanged(asset);
+	});
+}
+
+// call layer update on each tile change
+tiled.mapEditor.tilesetsView.stampCaptured.connect(onTilesetChange);
+
+// call the binding for each opened asset
+tiled.assetOpened.connect(bindTileSetToLayer);