Compact after resize, expose ActiveTabIndex, fix demo add-tile for active tab

Author: davidnmbond

PanoramicData.Blazor.Demo/Pages/PDDashboardPage.razor.cs

@@ -100,28 +100,19 @@ private void OnTabAdded(PDDashboardTab tab)
 
 	private void OnTileAddRequested()
 	{
-		// Find the active tab via the dashboard's tracked index
 		if (_dashboard is null)
 		{
 			return;
 		}
 
-		var (row, col) = _dashboard.FindNextAvailablePosition();
-
-		// Determine which tab is active
-		var activeTab = _tabs.ElementAtOrDefault(0);
-		if (_tabs.Count > 0)
-		{
-			// Use reflection-free approach: the dashboard places in active tab
-			// For the demo, just use the first tab (the dashboard handles it)
-			activeTab = _tabs[0];
-		}
-
+		var activeTab = _tabs.ElementAtOrDefault(_dashboard.ActiveTabIndex);
 		if (activeTab is null)
 		{
 			return;
 		}
 
+		var (row, col) = _dashboard.FindNextAvailablePosition();
+
 		var newTile = new PDDashboardTile
 		{
 			RowIndex = row,

PanoramicData.Blazor/PDDashboard.razor.cs

@@ -145,6 +145,11 @@ public partial class PDDashboard : PDComponentBase, IAsyncDisposable
 	[Parameter]
 	public EventCallback<int> ActiveTabChanged { get; set; }
 
+	/// <summary>
+	/// Gets the index of the currently active tab.
+	/// </summary>
+	public int ActiveTabIndex => _activeTabIndex;
+
 	protected override void OnInitialized()
 	{
 		base.OnInitialized();
@@ -428,6 +433,13 @@ private async Task OnResizePointerUp(PointerEventArgs e)
 			var tile = _resizingTile;
 			_resizingTile = null;
 
+			// Compact other tiles around the resized tile
+			var activeTab = (_activeTabIndex >= 0 && _activeTabIndex < Tabs.Count) ? Tabs[_activeTabIndex] : null;
+			if (activeTab is not null)
+			{
+				CompactTiles(activeTab, tile);
+			}
+
 			if (OnTileResize.HasDelegate)
 			{
 				await OnTileResize.InvokeAsync((tile, tile.RowSpanCount, tile.ColumnSpanCount)).ConfigureAwait(true);