ListView - remove FocusCues

This is a discussion on ListView - remove FocusCues within the C# Programming forums, part of the General Programming Boards category; hi! i'm currently designing an advanced ListView. it already has the ability of sorting by columns and vista style usind ...

  1. #1
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    Jan 2008
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    ListView - remove FocusCues

    hi!

    i'm currently designing an advanced ListView. it already has the ability of sorting by columns and vista style usind
    Code:
    SetWindowTheme(Handle, "Explorer", null);
    it looks like that: http://xload.dev-ch.de/c2a96e3bc372e855/screen348.jpg

    but the focus cues are really bothering me. they appear when i press up/down key for example.

    i tired:
    - overriding ShowFocusCues
    - pinvoke with WM_CHANGEUISTATE
    - can't remember, sitting all day here...

    does anyone know how i can remove them?
    thanks.

  2. #2
    Registered User C_ntua's Avatar
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    Jun 2008
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    1,853
    What is your goal? Do you want not to have focus at all? Implement the GotFocus() event and give focus to something else so the focus never stays on your list.

  3. #3
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    that woudld work. it would make it impossible to select items. i just want to remove the dotted lines called FocusCues... see the pic i have posted

  4. #4
    Registered User
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    england
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    Hi there.

    To me, the obvious way forward would be to paint your own row entries, in doing so completely bypassing the focus cue (or to be precise, being responsible for displaying the focus cue for youself). You'd also be responsible for displaying selected items and hot tracking.

    This code shows how you might paint the listview to look normal, minus focusing/hot tracking/selected item:

    Code:
    using System.Drawing;
    using System.Windows.Forms;
    
    namespace WindowsFormsApplication2
    {
        class LView : ListView
        {
            public LView()
            {
                this.OwnerDraw = true;
                this.DoubleBuffered = true;
            }
    
            protected override void OnDrawColumnHeader(DrawListViewColumnHeaderEventArgs e)
            {
                e.DrawDefault = true;
            }
    
            protected override void OnDrawSubItem(DrawListViewSubItemEventArgs e)
            {
                e.Graphics.DrawString(e.Item.SubItems[e.ColumnIndex].Text, this.Font, Brushes.Black, new PointF(e.Bounds.X + 3, e.Bounds.Y));
            }
        }
    }
    Last edited by theoobe; 07-09-2010 at 05:02 AM.

  5. #5
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    thanks, i know how to custom paint the stuff. i have some practice in it. but the goal for this listview was to look just native, the way it looks in explorer, too. so i didn't want to custom paint it. the reason is that 2k style, luna and aero all look different and my current listview fits in every os. this should stay that way, but the focus cues are somehow bothering...

    new update: i found out that when i was using the WM_CHANGEUISTATE api more often like when a key was pressed, it works (almost...)


    here is my listview: sortable, vista style, fully functional.
    happy sharing!

    Code:
    using System.Collections;
    using System.Runtime.InteropServices;
    
    namespace System.Windows.Forms
    {
    	public class exListView : ListView
    	{
    		private int _SortColumnIndex = -1;
    		public int SortColumnIndex
    		{
    			get
    			{
    				return _SortColumnIndex;
    			}
    			set
    			{
    				SetSortIcon(_SortColumnIndex, value);
    				_SortColumnIndex = value;
    			}
    		}
    		internal ColumnAttributes[] ColumnAttributes = new ColumnAttributes[100];
    
    		public exListView()
    		{
    			ListViewItemSorter = new exListViewItemSorter();
    			for (int i = 0; i < ColumnAttributes.Length; i++)
    			{
    				ColumnAttributes[i] = new ColumnAttributes(ColumnSortAlgorithm.String);
    			}
    			SendMessage(Handle, 0x127, 0x10001, 0);
    		}
    
    		protected override void OnHandleCreated(EventArgs e)
    		{
    			base.OnHandleCreated(e);
    			SetWindowTheme(Handle, "Explorer", null);
    			SortColumnIndex = _SortColumnIndex;
    		}
    		protected override void OnClick(EventArgs e)
    		{
    			base.OnClick(e);
    			SendMessage(Handle, 0x127, 0x10001, 0);
    		}
    		protected override void OnColumnClick(ColumnClickEventArgs e)
    		{
    			base.OnColumnClick(e);
    			Sorting = e.Column == _SortColumnIndex ? (Sorting == SortOrder.Ascending ? SortOrder.Descending : SortOrder.Ascending) : SortOrder.Ascending;
    			SortColumnIndex = e.Column;
    			Sort();
    		}
    		protected override void OnKeyUp(KeyEventArgs e)
    		{
    			base.OnKeyUp(e);
    			SendMessage(Handle, 0x127, 0x10001, 0);
    		}
    		private void SetSortIcon(int previous, int current)
    		{
    			IntPtr header = SendMessage(Handle, 0x101f, IntPtr.Zero, IntPtr.Zero);
    			HDITEM item;
    
    			if (previous != -1 && previous != current)
    			{
    				item = new HDITEM();
    				item.mask = 4;
    				SendMessage(header, 0x120b, (IntPtr)previous, ref item);
    				item.fmt &= ~0x0200 & ~0x0400;
    				SendMessage(header, 0x120c, (IntPtr)previous, ref item);
    			}
    			item = new HDITEM();
    			item.mask = 4;
    			SendMessage(header, 0x120b, (IntPtr)current, ref item);
    			if (Sorting == SortOrder.Ascending)
    			{
    				item.fmt &= ~0x0200;
    				item.fmt |= 0x0400;
    			}
    			else
    			{
    				item.fmt &= ~0x0400;
    				item.fmt |= 0x0200;
    			}
    			SendMessage(header, 0x120c, (IntPtr)current, ref item);
    			previous = current;
    			SetWindowTheme(Handle, "explorer", null);
    		}
    		public void SetColumnAttributes(int column, ColumnSortAlgorithm sortAlgorithm)
    		{
    			ColumnAttributes[column] = new ColumnAttributes(sortAlgorithm);
    		}
    
    		[StructLayout(LayoutKind.Sequential)]
    		private struct HDITEM
    		{
    			public int mask;
    			public int cxy;
    			[MarshalAs(UnmanagedType.LPTStr)]
    			public string pszText;
    			public IntPtr hbm;
    			public int cchTextMax;
    			public int fmt;
    			public int lParam;
    			public int iImage;
    			public int iOrder;
    		}
    		[DllImport("user32.dll")]
    		static private extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
    		[DllImport("user32.dll")]
    		static private extern IntPtr SendMessage(IntPtr Handle, int msg, IntPtr wParam, ref HDITEM lParam);
    		[DllImport("user32.dll")]
    		public extern static int SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);
    		[DllImport("uxtheme.dll", CharSet = CharSet.Unicode)]
    		static private extern int SetWindowTheme(IntPtr hWnd, string textSubAppName, string textSubIdList);
    	}
    
    	public class ColumnAttributes
    	{
    		public ColumnSortAlgorithm SortAlgorithm { get; set; }
    
    		public ColumnAttributes(ColumnSortAlgorithm sortAlgorithm)
    		{
    			SortAlgorithm = sortAlgorithm;
    		}
    	}
    	public enum ColumnSortAlgorithm
    	{
    		String,
    		Number,
    		NumberOfSubItemTag,
    		IPAddress,
    		TextLength
    	}
    
    	public class exListViewItemSorter : IComparer
    	{
    		public int Compare(object x, object y)
    		{
    			try
    			{
    				ListViewItem lx = (ListViewItem)x, ly = (ListViewItem)y;
    				exListView view = (exListView)lx.ListView;
    				if (view.Sorting == SortOrder.None) return 0;
    				int col = view.SortColumnIndex;
    				string tx = lx.SubItems[col].Text, ty = ly.SubItems[col].Text;
    
    				int compare = 0;
    				switch (view.ColumnAttributes[col].SortAlgorithm)
    				{
    					case ColumnSortAlgorithm.String:
    						compare = tx.CompareTo(ty);
    						break;
    					case ColumnSortAlgorithm.Number:
    						compare = Convert.ToInt32(tx).CompareTo(Convert.ToInt32(ty));
    						break;
    					case ColumnSortAlgorithm.NumberOfSubItemTag:
    						string tax = "", tay = "";
    						if (col == 0)
    						{
    							tax = Convert.ToString(lx.Tag);
    							tay = Convert.ToString(ly.Tag);
    						}
    						else
    						{
    							tax = Convert.ToString(lx.SubItems[col].Tag);
    							tay = Convert.ToString(ly.SubItems[col].Tag);
    						}
    						compare = Convert.ToInt32(tax).CompareTo(Convert.ToInt32(tay));
    						break;
    					case ColumnSortAlgorithm.IPAddress:
    						string[] ip1 = tx.Split('.');
    						string[] ip2 = ty.Split('.');
    						for (int i = 0; i < 4; i++)
    						{
    							if (ip1[i] != ip2[i])
    							{
    								compare = Convert.ToInt32(ip1[i]).CompareTo(Convert.ToInt32(ip2[i]));
    								break;
    							}
    						}
    						break;
    					case ColumnSortAlgorithm.TextLength:
    						compare = tx.Length.CompareTo(ty.Length);
    						break;
    				}
    				return view.Sorting == SortOrder.Ascending ? compare : -compare;
    			}
    			catch
    			{
    				return 0;
    			}
    		}
    	}
    }
    Last edited by Devils Child; 07-09-2010 at 08:23 AM.

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