#region Imports
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using DPumpHydr.WinFrmUI.RLT.Colors;
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using DPumpHydr.WinFrmUI.RLT.Util;
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using System;
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using System.Drawing;
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using System.Windows.Forms;
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#endregion
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namespace DPumpHydr.WinFrmUI.RLT.Controls
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{
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#region RoyalListBox
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public class RoyalListBox : Control
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{
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private readonly RoyalScrollBar scrollBar;
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public RoyalListBoxItemCollection Items { get; }
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public RoyalListBoxSelectedItemCollection SelectedItems { get; }
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public RoyalListBoxSelectedIndexCollection SelectedIndicies { get; }
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private bool multiSelection;
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public bool MultiSelection
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{
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get => multiSelection;
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set { multiSelection = value; Invalidate(); }
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}
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private readonly bool multiSelectKeyDown = false;
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private int itemHeight;
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public int ItemHeight
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{
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get => itemHeight;
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set { itemHeight = value; Invalidate(); }
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}
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private Color hotLightColor;
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public Color HotLightColor
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{
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get => hotLightColor;
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set { hotLightColor = value; Invalidate(); }
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}
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private Color selectedColor;
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public Color SelectedColor
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{
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get => selectedColor;
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set { selectedColor = value; Invalidate(); }
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}
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private int selectedIndex;
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public int SelectedIndex
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{
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get => selectedIndex;
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set { selectedIndex = value; Invalidate(); }
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}
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public object SelectedValue => null;
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private int hotLightedIndex;
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public int HotLightedIndex
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{
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get => hotLightedIndex;
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set { hotLightedIndex = value; Invalidate(); }
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}
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public object HotLightedItem => null;
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public RoyalListBox()
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{
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SetStyle(ControlStyles.AllPaintingInWmPaint, true);
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SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
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SelectedIndicies = new RoyalListBoxSelectedIndexCollection();
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SelectedItems = new RoyalListBoxSelectedItemCollection();
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Items = new RoyalListBoxItemCollection();
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Items.ItemAdded += new EventHandler(Items_ItemAdded);
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Items.ItemRemoved += new EventHandler(Items_ItemRemoved);
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ItemHeight = 30;
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HotLightColor = RoyalColors.HotTrackColor;
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SelectedColor = RoyalColors.AccentColor;
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SelectedIndex = -1;
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HotLightedIndex = -1;
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scrollBar = new RoyalScrollBar
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{
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GutterColor = RoyalColors.HotTrackColor,
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ThumbColor = RoyalColors.AccentColor,
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Location = new(Width - 5, 0),
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Size = new(5, Height),
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Orientation = Orientation.Vertical
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};
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scrollBar.ValueChanged += new EventHandler(ScrollBar_ValueChanged);
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scrollBar.SmallChange = ItemHeight;
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scrollBar.LargeChange = ItemHeight * 3;
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scrollBar.Show();
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Controls.Add(scrollBar);
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Controls.SetChildIndex(scrollBar, 0);
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}
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public int IndexFromPoint(Point p)
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{
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int index = (scrollBar.Value / ItemHeight) + (p.Y / ItemHeight);
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if (index >= Items.Count)
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{
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index = -1;
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}
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return index;
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}
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protected override void OnMouseMove(MouseEventArgs e)
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{
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int index = IndexFromPoint(e.Location);
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if (index >= 0 && index < Items.Count)
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{
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HotLightedIndex = index;
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Refresh();
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}
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base.OnMouseMove(e);
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}
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protected override void OnMouseEnter(EventArgs e)
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{
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base.OnMouseEnter(e);
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}
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protected override void OnMouseLeave(EventArgs e)
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{
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HotLightedIndex = -1;
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Refresh();
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base.OnMouseLeave(e);
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}
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protected override void OnMouseClick(MouseEventArgs e)
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{
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int index = IndexFromPoint(e.Location);
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if (index >= 0 && index < Items.Count)
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{
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if (multiSelection && multiSelectKeyDown)
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{
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SelectedIndicies.Add(index);
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SelectedItems.Add(Items[index]);
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Refresh();
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}
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else
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{
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SelectedIndicies.Clear();
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SelectedItems.Clear();
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SelectedIndex = index;
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Refresh();
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}
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}
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base.OnMouseClick(e);
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}
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protected override void OnMouseWheel(MouseEventArgs e)
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{
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scrollBar.Value -= e.Delta / 4;
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base.OnMouseWheel(e);
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}
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protected override void OnResize(EventArgs e)
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{
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scrollBar.Location = new(Width - 8, 0);
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scrollBar.Size = new(8, Height);
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base.OnResize(e);
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}
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protected void DrawItem(DrawItemEventArgs e)
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{
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Color foreColor = RoyalColors.ForeColor;
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Color backColor = RoyalColors.BackColor;
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string text = Items[e.Index].ToString();
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if (e.State == DrawItemState.HotLight)
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{
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backColor = RoyalColors.HotTrackColor;
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}
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else if (e.State == DrawItemState.Selected)
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{
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foreColor = RoyalColors.PressedForeColor;
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backColor = SelectedColor;
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}
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e.Graphics.FillRectangle(new SolidBrush(backColor), e.Bounds);
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TextRenderer.DrawText(e.Graphics, text, Font, e.Bounds, foreColor, Color.Transparent,
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TextFormatFlags.Left | TextFormatFlags.VerticalCenter | TextFormatFlags.LeftAndRightPadding);
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}
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protected override void OnPaint(PaintEventArgs e)
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{
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int firstVisibleItem = scrollBar.Value / ItemHeight;
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int lastVisibleItem = (scrollBar.Value / ItemHeight) + (Height / ItemHeight) + 1;
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if (firstVisibleItem < 0)
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{
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firstVisibleItem = 0;
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}
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if (lastVisibleItem > Items.Count)
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{
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lastVisibleItem = Items.Count;
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}
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for (int i = firstVisibleItem; i < lastVisibleItem; i++)
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{
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DrawItemState state = DrawItemState.Default;
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if (multiSelection && SelectedIndicies.Count > 0)
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{
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if (i == HotLightedIndex && !SelectedIndicies.Contains(i))
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{
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state = DrawItemState.HotLight;
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}
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else if (SelectedIndicies.Contains(i))
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{
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state = DrawItemState.Selected;
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}
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}
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else
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{
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if (i == HotLightedIndex && i != SelectedIndex)
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{
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state = DrawItemState.HotLight;
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}
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else if (i == SelectedIndex)
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{
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state = DrawItemState.Selected;
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}
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}
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Rectangle rect = new(0, (i - firstVisibleItem) * ItemHeight, Width, ItemHeight);
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DrawItemEventArgs de = new(e.Graphics, Font, rect, i, state);
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DrawItem(de);
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}
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base.OnPaint(e);
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}
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private void Items_ItemAdded(object sender, EventArgs e)
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{
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scrollBar.Max = Items.Count * ItemHeight;
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scrollBar.Refresh();
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}
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private void Items_ItemRemoved(object sender, EventArgs e)
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{
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scrollBar.Max = Items.Count * ItemHeight;
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scrollBar.Refresh();
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}
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private void ScrollBar_ValueChanged(object sender, EventArgs e)
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{
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Refresh();
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}
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};
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#endregion
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}
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