434 lines
13 KiB
C#
434 lines
13 KiB
C#
/// Credit Simie
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/// Sourced from - http://forum.unity3d.com/threads/flowlayoutgroup.296709/
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/// Example http://forum.unity3d.com/threads/flowlayoutgroup.296709/
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/// Update by Martin Sharkbomb - http://forum.unity3d.com/threads/flowlayoutgroup.296709/#post-1977028
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/// Last item alignment fix by Vicente Russo - https://bitbucket.org/SimonDarksideJ/unity-ui-extensions/issues/22/flow-layout-group-align
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/// Vertical Flow by Ramon Molossi
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using System.Collections.Generic;
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namespace UnityEngine.UI.Extensions
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{
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/// <summary>
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/// Layout Group controller that arranges children in bars, fitting as many on a line until total size exceeds parent bounds
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/// </summary>
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[AddComponentMenu("Layout/Extensions/Flow Layout Group")]
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public class FlowLayoutGroup : LayoutGroup
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{
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public enum Axis { Horizontal = 0, Vertical = 1 }
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public float SpacingX = 0f;
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public float SpacingY = 0f;
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public bool ExpandHorizontalSpacing = false;
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public bool ChildForceExpandWidth = false;
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public bool ChildForceExpandHeight = false;
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public bool invertOrder = false;
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private float _layoutHeight;
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private float _layoutWidth;
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[SerializeField] protected Axis m_StartAxis = Axis.Horizontal;
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public Axis startAxis { get { return m_StartAxis; } set { SetProperty(ref m_StartAxis, value); } }
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public override void CalculateLayoutInputHorizontal()
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{
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if (startAxis == Axis.Horizontal) {
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base.CalculateLayoutInputHorizontal ();
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var minWidth = GetGreatestMinimumChildWidth () + padding.left + padding.right;
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SetLayoutInputForAxis (minWidth, -1, -1, 0);
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} else {
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_layoutWidth = SetLayout (0, true);
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}
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}
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public override void SetLayoutHorizontal()
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{
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SetLayout(0, false);
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}
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public override void SetLayoutVertical()
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{
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SetLayout(1, false);
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}
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public override void CalculateLayoutInputVertical()
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{
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if (startAxis == Axis.Horizontal) {
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_layoutHeight = SetLayout (1, true);
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} else {
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base.CalculateLayoutInputHorizontal ();
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var minHeight = GetGreatestMinimumChildHeigth () + padding.bottom + padding.top;
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SetLayoutInputForAxis (minHeight, -1, -1, 1);
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}
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}
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protected bool IsCenterAlign
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{
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get
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{
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return childAlignment == TextAnchor.LowerCenter || childAlignment == TextAnchor.MiddleCenter ||
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childAlignment == TextAnchor.UpperCenter;
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}
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}
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protected bool IsRightAlign
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{
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get
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{
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return childAlignment == TextAnchor.LowerRight || childAlignment == TextAnchor.MiddleRight ||
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childAlignment == TextAnchor.UpperRight;
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}
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}
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protected bool IsMiddleAlign
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{
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get
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{
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return childAlignment == TextAnchor.MiddleLeft || childAlignment == TextAnchor.MiddleRight ||
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childAlignment == TextAnchor.MiddleCenter;
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}
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}
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protected bool IsLowerAlign
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{
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get
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{
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return childAlignment == TextAnchor.LowerLeft || childAlignment == TextAnchor.LowerRight ||
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childAlignment == TextAnchor.LowerCenter;
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}
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}
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/// <summary>
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/// Holds the rects that will make up the current bar being processed
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/// </summary>
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private readonly IList<RectTransform> _itemList = new List<RectTransform>();
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/// <summary>
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/// Main layout method
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/// </summary>
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/// <param name="width">Width to calculate the layout with</param>
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/// <param name="axis">0 for horizontal axis, 1 for vertical</param>
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/// <param name="layoutInput">If true, sets the layout input for the axis. If false, sets child position for axis</param>
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public float SetLayout(int axis, bool layoutInput)
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{
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//container height and width
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var groupHeight = rectTransform.rect.height;
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var groupWidth = rectTransform.rect.width;
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float spacingBetweenBars = 0;
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float spacingBetweenElements = 0;
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float offset = 0;
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float counterOffset = 0;
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float groupSize = 0;
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float workingSize = 0;
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if (startAxis == Axis.Horizontal) {
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groupSize = groupHeight;
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workingSize = groupWidth - padding.left - padding.right;
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if (IsLowerAlign) {
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offset = (float)padding.bottom;
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counterOffset = (float)padding.top;
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} else {
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offset = (float)padding.top;
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counterOffset = (float)padding.bottom;
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}
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spacingBetweenBars = SpacingY;
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spacingBetweenElements = SpacingX;
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} else if (startAxis == Axis.Vertical) {
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groupSize = groupWidth;
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workingSize = groupHeight - padding.top - padding.bottom;
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if (IsRightAlign) {
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offset = (float)padding.right;
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counterOffset = (float)padding.left;
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} else {
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offset = (float)padding.left;
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counterOffset = (float)padding.right;
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}
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spacingBetweenBars = SpacingX;
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spacingBetweenElements = SpacingY;
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}
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var currentBarSize = 0f;
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var currentBarSpace = 0f;
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for (var i = 0; i < rectChildren.Count; i++) {
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int index = i;
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var child = rectChildren [index];
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float childSize = 0;
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float childOtherSize = 0;
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//get height and width of elements.
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if (startAxis == Axis.Horizontal) {
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if (invertOrder) {
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index = IsLowerAlign ? rectChildren.Count - 1 - i : i;
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}
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child = rectChildren [index];
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childSize = LayoutUtility.GetPreferredSize (child, 0);
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childSize = Mathf.Min (childSize, workingSize);
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childOtherSize = LayoutUtility.GetPreferredSize (child, 1);
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} else if (startAxis == Axis.Vertical) {
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if (invertOrder) {
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index = IsRightAlign ? rectChildren.Count - 1 - i : i;
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}
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child = rectChildren [index];
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childSize = LayoutUtility.GetPreferredSize (child, 1);
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childSize = Mathf.Min (childSize, workingSize);
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childOtherSize = LayoutUtility.GetPreferredSize (child, 0);
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}
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// If adding this element would exceed the bounds of the container,
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// go to a new bar after processing the current bar
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if (currentBarSize + childSize > workingSize) {
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currentBarSize -= spacingBetweenElements;
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// Process current bar elements positioning
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if (!layoutInput) {
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if (startAxis == Axis.Horizontal) {
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float newOffset = CalculateRowVerticalOffset (groupSize, offset, currentBarSpace);
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LayoutRow (_itemList, currentBarSize, currentBarSpace, workingSize, padding.left, newOffset, axis);
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} else if (startAxis == Axis.Vertical) {
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float newOffset = CalculateColHorizontalOffset (groupSize, offset, currentBarSpace);
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LayoutCol (_itemList, currentBarSpace, currentBarSize, workingSize, newOffset, padding.top, axis);
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}
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}
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// Clear existing bar
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_itemList.Clear ();
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// Add the current bar space to total barSpace accumulator, and reset to 0 for the next row
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offset += currentBarSpace;
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offset += spacingBetweenBars;
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currentBarSpace = 0;
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currentBarSize = 0;
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}
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currentBarSize += childSize;
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_itemList.Add (child);
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// We need the largest element height to determine the starting position of the next line
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if (childOtherSize > currentBarSpace) {
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currentBarSpace = childOtherSize;
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}
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// Don't do this for the last one
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if (i < rectChildren.Count - 1){
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currentBarSize += spacingBetweenElements;
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}
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}
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// Layout the final bar
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if (!layoutInput) {
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if (startAxis == Axis.Horizontal) {
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float newOffset = CalculateRowVerticalOffset (groupHeight, offset, currentBarSpace);
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currentBarSize -= spacingBetweenElements;
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LayoutRow (_itemList, currentBarSize, currentBarSpace, workingSize, padding.left, newOffset, axis);
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}else if (startAxis == Axis.Vertical) {
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float newOffset = CalculateColHorizontalOffset(groupWidth, offset, currentBarSpace);
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currentBarSize -= spacingBetweenElements;
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LayoutCol(_itemList, currentBarSpace, currentBarSize, workingSize, newOffset, padding.top, axis);
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}
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}
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_itemList.Clear();
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// Add the last bar space to the barSpace accumulator
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offset += currentBarSpace;
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offset += counterOffset;
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if (layoutInput) {
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SetLayoutInputForAxis(offset, offset, -1, axis);
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}
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return offset;
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}
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private float CalculateRowVerticalOffset(float groupHeight, float yOffset, float currentRowHeight)
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{
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if (IsLowerAlign) {
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return groupHeight - yOffset - currentRowHeight;
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} else if (IsMiddleAlign) {
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return groupHeight * 0.5f - _layoutHeight * 0.5f + yOffset;
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} else {
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return yOffset;
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}
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}
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private float CalculateColHorizontalOffset(float groupWidth, float xOffset, float currentColWidth)
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{
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if (IsRightAlign) {
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return groupWidth - xOffset - currentColWidth;
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} else if (IsCenterAlign) {
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return groupWidth * 0.5f - _layoutWidth * 0.5f + xOffset;
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} else {
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return xOffset;
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}
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}
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protected void LayoutRow(IList<RectTransform> contents, float rowWidth, float rowHeight, float maxWidth, float xOffset, float yOffset, int axis)
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{
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var xPos = xOffset;
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if (!ChildForceExpandWidth && IsCenterAlign) {
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xPos += (maxWidth - rowWidth) * 0.5f;
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} else if (!ChildForceExpandWidth && IsRightAlign) {
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xPos += (maxWidth - rowWidth);
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}
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var extraWidth = 0f;
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var extraSpacing = 0f;
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if (ChildForceExpandWidth) {
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extraWidth = (maxWidth - rowWidth)/_itemList.Count;
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}
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else if (ExpandHorizontalSpacing) {
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extraSpacing = (maxWidth - rowWidth)/(_itemList.Count - 1);
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if (_itemList.Count > 1) {
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if (IsCenterAlign) {
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xPos -= extraSpacing * 0.5f * (_itemList.Count - 1);
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} else if (IsRightAlign) {
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xPos -= extraSpacing * (_itemList.Count - 1);
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}
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}
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}
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for (var j = 0; j < _itemList.Count; j++) {
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var index = IsLowerAlign ? _itemList.Count - 1 - j : j;
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var rowChild = _itemList[index];
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var rowChildWidth = LayoutUtility.GetPreferredSize(rowChild, 0) + extraWidth;
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var rowChildHeight = LayoutUtility.GetPreferredSize(rowChild, 1);
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if (ChildForceExpandHeight)
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rowChildHeight = rowHeight;
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rowChildWidth = Mathf.Min(rowChildWidth, maxWidth);
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var yPos = yOffset;
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if (IsMiddleAlign) {
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yPos += (rowHeight - rowChildHeight) * 0.5f;
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} else if (IsLowerAlign) {
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yPos += (rowHeight - rowChildHeight);
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}
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if (ExpandHorizontalSpacing && j > 0) {
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xPos += extraSpacing;
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}
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if (axis == 0) {
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SetChildAlongAxis (rowChild, 0, xPos, rowChildWidth);
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} else {
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SetChildAlongAxis (rowChild, 1, yPos, rowChildHeight);
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}
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// Don't do horizontal spacing for the last one
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if (j < _itemList.Count - 1) {
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xPos += rowChildWidth + SpacingX;
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}
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}
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}
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protected void LayoutCol(IList<RectTransform> contents, float colWidth, float colHeight, float maxHeight, float xOffset, float yOffset, int axis)
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{
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var yPos = yOffset;
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if (!ChildForceExpandHeight && IsMiddleAlign) {
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yPos += (maxHeight - colHeight) * 0.5f;
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} else if (!ChildForceExpandHeight && IsLowerAlign) {
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yPos += (maxHeight - colHeight);
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}
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var extraHeight = 0f;
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var extraSpacing = 0f;
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if (ChildForceExpandHeight) {
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extraHeight = (maxHeight - colHeight)/_itemList.Count;
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}
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else if (ExpandHorizontalSpacing) {
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extraSpacing = (maxHeight - colHeight)/(_itemList.Count - 1);
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if (_itemList.Count > 1) {
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if (IsMiddleAlign) {
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yPos -= extraSpacing * 0.5f * (_itemList.Count - 1);
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} else if (IsLowerAlign) {
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yPos -= extraSpacing * (_itemList.Count - 1);
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}
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}
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}
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for (var j = 0; j < _itemList.Count; j++) {
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var index = IsRightAlign ? _itemList.Count - 1 - j : j;
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var rowChild = _itemList[index];
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var rowChildWidth = LayoutUtility.GetPreferredSize(rowChild, 0) ;
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var rowChildHeight = LayoutUtility.GetPreferredSize(rowChild, 1) + extraHeight;
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if (ChildForceExpandWidth) {
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rowChildWidth = colWidth;
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}
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rowChildHeight = Mathf.Min(rowChildHeight, maxHeight);
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var xPos = xOffset;
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if (IsCenterAlign) {
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xPos += (colWidth - rowChildWidth) * 0.5f;
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} else if (IsRightAlign) {
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xPos += (colWidth - rowChildWidth);
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}
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//
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if (ExpandHorizontalSpacing && j > 0) {
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yPos += extraSpacing;
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}
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if (axis == 0) {
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SetChildAlongAxis (rowChild, 0, xPos, rowChildWidth);
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} else {
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SetChildAlongAxis (rowChild, 1, yPos, rowChildHeight);
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}
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// Don't do vertical spacing for the last one
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if (j < _itemList.Count - 1) {
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yPos += rowChildHeight + SpacingY;
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}
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}
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}
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public float GetGreatestMinimumChildWidth()
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{
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var max = 0f;
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for (var i = 0; i < rectChildren.Count; i++) {
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var w = LayoutUtility.GetMinWidth(rectChildren[i]);
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max = Mathf.Max(w, max);
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}
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return max;
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}
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public float GetGreatestMinimumChildHeigth()
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{
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var max = 0f;
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for (var i = 0; i < rectChildren.Count; i++) {
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var w = LayoutUtility.GetMinHeight(rectChildren[i]);
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max = Mathf.Max(w, max);
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}
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return max;
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}
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protected override void OnDisable()
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{
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m_Tracker.Clear();
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LayoutRebuilder.MarkLayoutForRebuild(rectTransform);
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}
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}
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} |