337 lines
13 KiB
C#
337 lines
13 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Drawing;
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using System.Data;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace UserControls
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{
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public class ListViewItemCollectionWithEvents : ListView.ListViewItemCollection
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{
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// Variables
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private ListView parent;
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// Constructor
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public ListViewItemCollectionWithEvents(ListView owner)
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: base(owner)
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{
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parent = owner;
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}
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// Methods
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public new ListViewItem Add(ListViewItem listViewItem)
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{
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base.Add(listViewItem);
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((ListViewWithSelection)parent).ItemAdded(listViewItem);
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return listViewItem;
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}
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public new ListViewItem[] AddRange(ListViewItem[] listViewItems)
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{
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base.AddRange(listViewItems);
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((ListViewWithSelection)parent).ItemRangeAdded(listViewItems);
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return listViewItems;
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}
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public new ListViewItem Remove(ListViewItem listViewItem)
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{
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base.Remove(listViewItem);
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((ListViewWithSelection)parent).ItemRemoved(listViewItem);
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return listViewItem;
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}
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public new ListViewItem RemoveAt(int index)
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{
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ListViewItem listViewItem = this[index];
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base.RemoveAt(index);
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((ListViewWithSelection)parent).ItemRemovedAt(index, listViewItem);
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return listViewItem;
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}
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}
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public partial class ListViewWithSelection : ListView
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{
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// Delegates
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public delegate void ListViewItemAddedDelegate(ListViewItem item);
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public delegate void ListViewItemRangeAddedDelegate(ListViewItem[] item);
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public delegate void ListViewItemRemovedDelegate(ListViewItem item);
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public delegate void ListViewItemRemovedAtDelegate(int index, ListViewItem item);
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// Variables
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private bool _disableMouse;
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private bool _resizeNeeded;
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private ListViewItem _prevSelectedItem;
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private Color[] _prevSelectedItemsColors;
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private Color _mouseOverColor = Color.FromArgb((int)(SystemColors.Highlight.R + (255 - SystemColors.Highlight.R) * 0.8),
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(int)(SystemColors.Highlight.G + (255 - SystemColors.Highlight.G) * 0.8),
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(int)(SystemColors.Highlight.B + (255 - SystemColors.Highlight.B) * 0.8));
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private ListViewItem _prevMouseOverItem;
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private Color[] _prevMouseOverNodeColors;
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public new ListViewItemCollectionWithEvents Items;
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// Properties
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public bool DisableMouse { get { return _disableMouse; } set { _disableMouse = value; } }
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public Color MouseOverColor
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{
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get { return _mouseOverColor; }
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set { _mouseOverColor = value; }
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}
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public List<ListViewItem> PossiblySelectedItems
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{
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get
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{
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if (base.SelectedItems.Count > 0)
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{
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List<ListViewItem> list = new List<ListViewItem>();
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foreach (ListViewItem item in base.SelectedItems) list.Add(item);
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return list;
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}
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else if (_prevSelectedItem != null)
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{
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List<ListViewItem> list = new List<ListViewItem>() { _prevSelectedItem };
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return list;
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}
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return new List<ListViewItem>();
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}
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}
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// Events
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public event ListViewItemAddedDelegate ItemAddedEvent;
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public event ListViewItemRangeAddedDelegate ItemRangeAddedEvent;
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public event ListViewItemRemovedDelegate ItemRemovedEvent;
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public event ListViewItemRemovedAtDelegate ItemRemovedAtEvent;
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// Constructor
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public ListViewWithSelection()
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{
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InitializeComponent();
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// Activate double buffering
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SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint, true);
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//
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DoubleBuffered = true;
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//
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_disableMouse = false;
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_resizeNeeded = true;
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Items = new ListViewItemCollectionWithEvents(this);
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}
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// Methods
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protected override void WndProc(ref Message m)
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{
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// Keeps the selection at all times - even if clicked outside client area
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// Swallow mouse messages that are not in the client area
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if (m.Msg >= 0x201 && m.Msg <= 0x209)
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{
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// Eat left and right mouse clicks
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if (_disableMouse) return;
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//
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Point pos = new Point(m.LParam.ToInt32());
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var hit = this.HitTest(pos);
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switch (hit.Location)
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{
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case ListViewHitTestLocations.AboveClientArea:
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case ListViewHitTestLocations.BelowClientArea:
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case ListViewHitTestLocations.LeftOfClientArea:
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case ListViewHitTestLocations.RightOfClientArea:
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case ListViewHitTestLocations.None:
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return;
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}
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}
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else if (m.Msg == 0x0F) // WM_PAINT
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{
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ResizeColumnHeaders();
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}
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//
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//switch (m.Msg)
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//{
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// case 0x1007: //ListViewItemAdd-A
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// System.Diagnostics.Debug.WriteLine("Item added (A)");
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// //ResizeColumnHeaders();
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// break;
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// case 0x104D: //ListViewItemAdd-W
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// System.Diagnostics.Debug.WriteLine("Item added (W)");
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// //ResizeColumnHeaders();
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// break;
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// case 0x1008:
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// System.Diagnostics.Debug.WriteLine("Item removed");
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// //ResizeColumnHeaders();
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// break;
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// case 0x1009:
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// System.Diagnostics.Debug.WriteLine("Item removed (All)");
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// //ResizeColumnHeaders();
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// break;
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// default:
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// break;
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//}
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//
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base.WndProc(ref m);
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}
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public void ResizeColumnHeaders()
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{
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if (_resizeNeeded)
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{
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_resizeNeeded = false;
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//
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if (this.Columns.Count > 0)
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{
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for (int i = 0; i < this.Columns.Count - 1; i++) AutoResizeColumn(i, ColumnHeaderAutoResizeStyle.ColumnContent);
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// -1 Contents
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// -2 fill
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this.Columns[this.Columns.Count - 1].Width = -1;
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//this.Columns[this.Columns.Count - 1].Width = -2;
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//this.Columns[this.Columns.Count - 1].Width -= 2;
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}
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}
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}
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internal void ItemAdded(ListViewItem listViewItem)
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{
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//ResizeColumnHeaders();
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_resizeNeeded = true;
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ItemAddedEvent?.Invoke(listViewItem);
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}
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internal void ItemRangeAdded(ListViewItem[] listViewItems)
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{
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//ResizeColumnHeaders();
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_resizeNeeded = true;
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ItemRangeAddedEvent?.Invoke(listViewItems);
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}
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internal void ItemRemoved(ListViewItem listViewItem)
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{
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//ResizeColumnHeaders();
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_resizeNeeded = true;
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ItemRemovedEvent?.Invoke(listViewItem);
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}
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internal void ItemRemovedAt(int index, ListViewItem listViewItem)
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{
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//ResizeColumnHeaders();
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_resizeNeeded = true;
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ItemRemovedAtEvent?.Invoke(index, listViewItem);
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}
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//https://stackoverflow.com/questions/2691726/how-can-i-remove-the-selection-border-on-a-listviewitem
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protected override void OnSelectedIndexChanged(EventArgs e)
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{
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// One item should always be selected
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if (SelectedItems.Count > 0)
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{
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base.OnSelectedIndexChanged(e);
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//
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ClearPrevSelection();
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//
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if (Enabled)
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{
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// Remove the selection and use color to show the previously selected item
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foreach (ListViewItem item in SelectedItems)
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{
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_prevSelectedItem = item;
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_prevSelectedItemsColors = new Color[] { item.BackColor, item.ForeColor };
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//
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item.BackColor = SystemColors.Highlight;
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item.ForeColor = SystemColors.HighlightText;
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//
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item.Selected = false; // calls itself
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}
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}
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}
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//
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Message m = Message.Create(this.Handle, 0x127, new IntPtr(0x10001), new IntPtr(0));
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this.WndProc(ref m);
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}
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protected override void OnEnter(EventArgs e)
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{
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base.OnEnter(e);
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Message m = Message.Create(this.Handle, 0x127, new IntPtr(0x10001), new IntPtr(0));
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this.WndProc(ref m);
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}
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protected override void OnKeyUp(KeyEventArgs e)
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{
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base.OnKeyUp(e);
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//Message m = Message.Create(this.Handle, 0x127, new IntPtr(0x10001), new IntPtr(0));
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//this.WndProc(ref m);
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}
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protected override void OnEnabledChanged(EventArgs e)
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{
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if (Enabled == false && _prevSelectedItem != null)
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{
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_prevSelectedItem.Selected = true;
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}
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base.OnEnabledChanged(e);
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}
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//
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public ListViewItem SelectedItem
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{
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get
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{
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if (SelectedItems != null && SelectedItems.Count == 1)
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return SelectedItems[0];
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else if (_prevSelectedItem != null) return _prevSelectedItem;
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else return null;
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}
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}
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protected override void OnMouseDown(MouseEventArgs e)
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{
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ClearMouseOverSelection();
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//
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base.OnMouseDown(e);
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}
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protected override void OnMouseMove(MouseEventArgs e)
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{
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ListViewItem item = this.GetItemAt(e.X, e.Y);
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//
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if (item != null && !item.Selected && item != _prevSelectedItem)
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{
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if (item != _prevMouseOverItem)
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{
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ClearMouseOverSelection();
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//
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_prevMouseOverNodeColors = new Color[] { item.BackColor, item.ForeColor };
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//
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item.BackColor = _mouseOverColor;
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_prevMouseOverItem = item;
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}
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}
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else ClearMouseOverSelection();
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//
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base.OnMouseMove(e);
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}
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protected override void OnMouseLeave(EventArgs e)
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{
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ClearMouseOverSelection();
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//
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base.OnMouseLeave(e);
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}
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private void ClearMouseOverSelection()
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{
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if (_prevMouseOverItem != null && !_prevMouseOverItem.Selected)
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{
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_prevMouseOverItem.BackColor = _prevMouseOverNodeColors[0];
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_prevMouseOverItem.ForeColor = _prevMouseOverNodeColors[1];
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}
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//
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_prevMouseOverItem = null;
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_prevMouseOverNodeColors = null;
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}
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private void ClearPrevSelection()
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{
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if (_prevSelectedItem != null)
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{
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_prevSelectedItem.BackColor = _prevSelectedItemsColors[0];
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_prevSelectedItem.ForeColor = _prevSelectedItemsColors[1];
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}
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//
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_prevSelectedItem = null;
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_prevSelectedItemsColors = null;
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}
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}
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}
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