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Source/Engine/UI/GUI/Panels/PanelWithMargins.cs

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+namespace FlaxEngine.GUI
+{
+    /// <summary>
+    /// Helper control class for other panels.
+    /// </summary>
+    /// <seealso cref="FlaxEngine.GUI.ContainerControl" />
+    public abstract class PanelWithMargins : ContainerControl
+    {
+        /// <summary>
+        /// The panel area margins.
+        /// </summary>
+        protected Margin _margin = new Margin(2.0f);
+
+        /// <summary>
+        /// The space between the items.
+        /// </summary>
+        protected float _spacing = 2;
+
+        /// <summary>
+        /// The auto size flag.
+        /// </summary>
+        protected bool _autoSize = true;
+
+        /// <summary>
+        /// The control offset.
+        /// </summary>
+        protected Vector2 _offset;
+
+        /// <summary>
+        /// Gets or sets the left margin.
+        /// </summary>
+        [HideInEditor, NoSerialize]
+        public float LeftMargin
+        {
+            get => _margin.Left;
+            set
+            {
+                if (!Mathf.NearEqual(_margin.Left, value))
+                {
+                    _margin.Left = value;
+                    PerformLayout();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the right margin.
+        /// </summary>
+        [HideInEditor, NoSerialize]
+        public float RightMargin
+        {
+            get => _margin.Right;
+            set
+            {
+                if (!Mathf.NearEqual(_margin.Right, value))
+                {
+                    _margin.Right = value;
+                    PerformLayout();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the top margin.
+        /// </summary>
+        [HideInEditor, NoSerialize]
+        public float TopMargin
+        {
+            get => _margin.Top;
+            set
+            {
+                if (!Mathf.NearEqual(_margin.Top, value))
+                {
+                    _margin.Top = value;
+                    PerformLayout();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the bottom margin.
+        /// </summary>
+        [HideInEditor, NoSerialize]
+        public float BottomMargin
+        {
+            get => _margin.Bottom;
+            set
+            {
+                if (!Mathf.NearEqual(_margin.Bottom, value))
+                {
+                    _margin.Bottom = value;
+                    PerformLayout();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the child controls spacing.
+        /// </summary>
+        [EditorOrder(10), Tooltip("The child controls spacing (the space between controls).")]
+        public float Spacing
+        {
+            get => _spacing;
+            set
+            {
+                if (!Mathf.NearEqual(_spacing, value))
+                {
+                    _spacing = value;
+                    PerformLayout();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the child controls offset (additive).
+        /// </summary>
+        [EditorOrder(20), Tooltip("The child controls offset (additive).")]
+        public Vector2 Offset
+        {
+            get => _offset;
+            set
+            {
+                if (!Vector2.NearEqual(ref _offset, ref value))
+                {
+                    _offset = value;
+                    PerformLayout();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the value indicating whenever the panel size will be based on a children dimensions.
+        /// </summary>
+        [EditorOrder(30), Tooltip("If checked, the panel size will be based on a children dimensions.")]
+        public bool AutoSize
+        {
+            get => _autoSize;
+            set
+            {
+                if (_autoSize != value)
+                {
+                    _autoSize = value;
+                    PerformLayout();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the panel area margin.
+        /// </summary>
+        [EditorOrder(40), Tooltip("The panel area margin.")]
+        public Margin Margin
+        {
+            get => _margin;
+            set
+            {
+                if (_margin != value)
+                {
+                    _margin = value;
+                    PerformLayout();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PanelWithMargins"/> class.
+        /// </summary>
+        protected PanelWithMargins()
+        : base(0, 0, 64, 64)
+        {
+            AutoFocus = false;
+        }
+
+        /// <inheritdoc />
+        public override void OnChildResized(Control control)
+        {
+            base.OnChildResized(control);
+
+            PerformLayout();
+        }
+    }
+}