Unable to resize through code after docking a panel

Description of the bug

So I tried to dock a RectTransform using code and it doesn't seem to resize properly, it's stuck at MinSize still even though I don't want it to start at MinSize,

Despite debugging making sure the Vector2 I used is correct, the panel is still resized towards it's minimum size

Reproduction steps

Here's the code I'm using

using DynamicPanels;
using UnityEngine;

namespace Rhitomata {
    public class GameUI : MonoBehaviour {
        public DynamicPanelsCanvas dynamicCanvas;

        [Header("Timeline")]
        public RectTransform timelinePanel;
        public Vector2 timelineMinSize = new(200f, 100f);
        [HideInInspector] public Panel dynamicTimelinePanel;
        [HideInInspector] public PanelTab dynamicTimelinePanelTab;

        private void Awake() {
            // Timeline
            var previousTimelineSize = timelinePanel.rect.size;
            dynamicTimelinePanel = PanelUtils.CreatePanelFor(timelinePanel, dynamicCanvas);
            dynamicTimelinePanel.DockToRoot(Direction.Bottom);
            dynamicTimelinePanelTab = PanelUtils.GetAssociatedTab(timelinePanel);
            dynamicTimelinePanelTab.MinSize = timelineMinSize;
            dynamicTimelinePanelTab.Icon = null;
            dynamicTimelinePanelTab.Label = "Timeline";
            dynamicTimelinePanel.ResizeTo(previousTimelineSize);
        }
    }
}

Platform specs

Please provide the following info if this is a Unity 3D repository.

Unity version: 6000.0.51f1
Platform: Unity Editor
Device: Lenovo Thinkpad L15 Gen 1
How did you download the plugin: GitHub

Additional info
None

DynamicPanelsCanvas builds its layout in Start:

UnityDynamicPanels/Plugins/DynamicPanels/Scripts/DynamicPanelsCanvas.cs

Lines 280 to 333 in f69af3a

    
           private void Start() 
        
           { 
        
           	Size = RectTransform.rect.size; 
        
           	HashSet<Transform> createdTabs = new HashSet<Transform>(); // A set to prevent duplicate tabs or to prevent making canvas itself a panel 
        
           	Transform tr = transform; 
        
           	while( tr ) 
        
           	{ 
        
           		createdTabs.Add( tr ); 
        
           		tr = tr.parent; 
        
           	} 
        
           	Dictionary<Panel, Vector2> initialSizes = null; 
        
           	if( initialPanelsAnchored != null ) 
        
           	{ 
        
           		initialSizes = new Dictionary<Panel, Vector2>( initialPanelsAnchoredSerialized.Count ); 
        
           		CreateAnchoredPanelsRecursively( initialPanelsAnchored.subPanels, dummyPanel, createdTabs, initialSizes ); 
        
           	} 
        
           	for( int i = 0; i < initialPanelsUnanchored.Count; i++ ) 
        
           		CreateInitialPanel( initialPanelsUnanchored[i], null, Direction.None, createdTabs ); 
        
           	initialPanelsUnanchored = null; 
        
           	initialPanelsAnchored = null; 
        
           	initialPanelsAnchoredSerialized = null; 
        
           	if( freeSpaceTargetTransform ) 
        
           	{ 
        
           		if( freeSpaceTargetTransform.parent != RectTransform ) 
        
           			freeSpaceTargetTransform.SetParent( RectTransform, false ); 
        
           		freeSpaceTargetTransform.anchorMin = Vector2.zero; 
        
           		freeSpaceTargetTransform.anchorMax = Vector2.zero; 
        
           		freeSpaceTargetTransform.pivot = Vector2.zero; 
        
           		freeSpaceTargetTransform.SetAsFirstSibling(); 
        
           	} 
        
           	LeaveFreeSpace = m_leaveFreeSpace; 
        
           	LateUpdate(); // Update layout 
        
           	if( m_leaveFreeSpace ) 
        
           	{ 
        
           		// Minimize all panels to their minimum size 
        
           		dummyPanel.ResizeTo( new Vector2( 99999f, 99999f ) ); 
        
           		//RootPanelGroup.Internal.TryChangeSizeOf( dummyPanel, Direction.Left, 20009f ); 
        
           		//RootPanelGroup.Internal.TryChangeSizeOf( dummyPanel, Direction.Top, 20009f ); // Magick number.. 
        
           		//RootPanelGroup.Internal.TryChangeSizeOf( dummyPanel, Direction.Right, 20009f ); // or not? 
        
           		//RootPanelGroup.Internal.TryChangeSizeOf( dummyPanel, Direction.Bottom, 20009f ); // A: just a big random number U_U 
        
           	} 
        
           	if( initialSizes != null ) 
        
           		ResizeAnchoredPanelsRecursively( RootPanelGroup, initialSizes ); 
        
           }

It might be possible that this process overrides your code that is inside Awake (which is invoked before Start). Could you try executing your code in Start?

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Unable to resize through code after docking a panel #23

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	private void Start()
	{
	Size = RectTransform.rect.size;

	HashSet<Transform> createdTabs = new HashSet<Transform>(); // A set to prevent duplicate tabs or to prevent making canvas itself a panel
	Transform tr = transform;
	while( tr )
	{
	createdTabs.Add( tr );
	tr = tr.parent;
	}

	Dictionary<Panel, Vector2> initialSizes = null;
	if( initialPanelsAnchored != null )
	{
	initialSizes = new Dictionary<Panel, Vector2>( initialPanelsAnchoredSerialized.Count );
	CreateAnchoredPanelsRecursively( initialPanelsAnchored.subPanels, dummyPanel, createdTabs, initialSizes );
	}

	for( int i = 0; i < initialPanelsUnanchored.Count; i++ )
	CreateInitialPanel( initialPanelsUnanchored[i], null, Direction.None, createdTabs );

	initialPanelsUnanchored = null;
	initialPanelsAnchored = null;
	initialPanelsAnchoredSerialized = null;

	if( freeSpaceTargetTransform )
	{
	if( freeSpaceTargetTransform.parent != RectTransform )
	freeSpaceTargetTransform.SetParent( RectTransform, false );

	freeSpaceTargetTransform.anchorMin = Vector2.zero;
	freeSpaceTargetTransform.anchorMax = Vector2.zero;
	freeSpaceTargetTransform.pivot = Vector2.zero;
	freeSpaceTargetTransform.SetAsFirstSibling();
	}

	LeaveFreeSpace = m_leaveFreeSpace;
	LateUpdate(); // Update layout

	if( m_leaveFreeSpace )
	{
	// Minimize all panels to their minimum size
	dummyPanel.ResizeTo( new Vector2( 99999f, 99999f ) );

	//RootPanelGroup.Internal.TryChangeSizeOf( dummyPanel, Direction.Left, 20009f );
	//RootPanelGroup.Internal.TryChangeSizeOf( dummyPanel, Direction.Top, 20009f ); // Magick number..
	//RootPanelGroup.Internal.TryChangeSizeOf( dummyPanel, Direction.Right, 20009f ); // or not?
	//RootPanelGroup.Internal.TryChangeSizeOf( dummyPanel, Direction.Bottom, 20009f ); // A: just a big random number U_U
	}

	if( initialSizes != null )
	ResizeAnchoredPanelsRecursively( RootPanelGroup, initialSizes );
	}

Unable to resize through code after docking a panel #23

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yasirkula commented on Jul 24, 2025

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