using UnityEngine;
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using UnityEngine.UI;
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using EnhancedUI.EnhancedScroller;
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namespace EnhancedScrollerDemos.SelectionDemo
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{
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/// <summary>
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/// This delegate handles the UI's button click
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/// </summary>
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/// <param name="cellView">The cell view that had the button click</param>
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public delegate void SelectedDelegate(EnhancedScrollerCellView cellView);
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/// <summary>
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/// This class handles the presentation of the inventory cell view. Both the
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/// horizontal and vertical cell views share the same view class. The difference
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/// between them is layout and sprite for this example.
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/// </summary>
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public class InventoryCellView : EnhancedScrollerCellView
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{
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/// <summary>
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/// Reference to the underlying data driving this view
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/// </summary>
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private InventoryData _data;
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/// <summary>
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/// These are the UI elements that will be updated when the data changes
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/// </summary>
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public Image selectionPanel;
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public Text itemNameText;
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public Text itemCostText;
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public Text itemDamageText;
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public Text itemDefenseText;
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public Text itemWeightText;
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public Text itemDescriptionText;
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public Image image;
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/// <summary>
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/// These are the colors for the selection of the cells
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/// </summary>
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public Color selectedColor;
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public Color unSelectedColor;
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/// <summary>
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/// Public reference to the index of the data
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/// </summary>
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public int DataIndex { get; private set; }
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/// <summary>
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/// The handler to call when this cell's button traps a click event
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/// </summary>
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public SelectedDelegate selected;
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/// <summary>
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/// This is called if the cell is destroyed. The EnhancedScroller will
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/// not call this since it uses recycling, but we include it in case
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/// the user decides to destroy the cell anyway
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/// </summary>
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void OnDestroy()
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{
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if (_data != null)
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{
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// remove the handler from the data so
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// that any changes to the data won't try
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// to call this destroyed view's function
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_data.selectedChanged -= SelectedChanged;
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}
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}
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/// <summary>
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/// This function sets up the data for the cell view
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/// </summary>
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/// <param name="dataIndex">The index of the data</param>
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/// <param name="data">The data to use</param>
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/// <param name="isVertical">Whether this view is vertical or horizontal (which will determine the sprite to use)</param>
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public void SetData(int dataIndex, InventoryData data, bool isVertical)
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{
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// if there was previous data assigned to this cell view,
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// we need to remove the handler for the selection change
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if (_data != null)
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{
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_data.selectedChanged -= SelectedChanged;
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}
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// link the data to the cell view
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DataIndex = dataIndex;
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_data = data;
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// update the cell view's UI
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itemNameText.text = data.itemName;
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if (itemCostText != null) itemCostText.text = (data.itemCost > 0 ? data.itemCost.ToString() : "-");
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if (itemDamageText != null) itemDamageText.text = (data.itemDamage > 0 ? data.itemDamage.ToString() : "-");
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if (itemDefenseText != null) itemDefenseText.text = (data.itemDefense > 0 ? data.itemDefense.ToString() : "-");
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if (itemWeightText != null) itemWeightText.text = (data.itemWeight > 0 ? data.itemWeight.ToString() : "-");
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// the description is only shown on the vertical cell view
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if (isVertical)
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itemDescriptionText.text = data.itemDescription;
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// set up the sprite based on the sprite path and whether the
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// view is horizontal or vertical
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image.sprite = Resources.Load<Sprite>(data.spritePath + (isVertical ? "_v" : "_h"));
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// set up a handler so that when the data changes
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// the cell view will update accordingly. We only
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// want a single handler for this cell view, so
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// first we remove any previous handlers before
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// adding the new one
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_data.selectedChanged -= SelectedChanged;
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_data.selectedChanged += SelectedChanged;
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// update the selection state UI
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SelectedChanged(data.Selected);
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}
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/// <summary>
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/// This function changes the UI state when the item is
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/// selected or unselected.
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/// </summary>
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/// <param name="selected">The selection state of the cell</param>
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private void SelectedChanged(bool selected)
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{
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selectionPanel.color = (selected ? selectedColor : unSelectedColor);
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}
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/// <summary>
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/// This function is called by the cell's button click event
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/// </summary>
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public void OnSelected()
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{
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// if a handler exists for this cell, then
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// call it.
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if (selected != null) selected(this);
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}
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}
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}
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