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VListBox.cs
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VListBox.cs
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using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace vbAccelerator.Components.Controls
{
/// <summary>
/// A simple implementation of a Virtual ListBox. A virtual ListBox
/// contains no data, instead it just allocates space for a specified
/// number of rows. Whenever a row needs to be shown, the <see cref="OnDrawItem"/>
/// method is fired which in turn fires the <see cref="DrawItem"/> event.
/// </summary>
public class VListBox : ListBox
{
[Category("Action")]
private const int WM_HSCROLL = 0x114;
private const int WM_VSCROLL = 0x115;
private const int WM_MOUSEWHEEL = 0x20A;
public event ScrollEventHandler OnHorizontalScroll;
public event ScrollEventHandler OnVerticalScroll;
private const int SB_LINEUP = 0;
private const int SB_LINELEFT = 0;
private const int SB_LINEDOWN = 1;
private const int SB_LINERIGHT = 1;
private const int SB_PAGEUP = 2;
private const int SB_PAGELEFT = 2;
private const int SB_PAGEDOWN = 3;
private const int SB_PAGERIGHT = 3;
private const int SB_THUMBPOSITION = 4;
private const int SB_THUMBTRACK = 5;
private const int SB_PAGETOP = 6;
private const int SB_LEFT = 6;
private const int SB_PAGEBOTTOM = 7;
private const int SB_RIGHT = 7;
private const int SB_ENDSCROLL = 8;
private const int SIF_TRACKPOS = 0x10;
private const int SIF_RANGE = 0x1;
private const int SIF_POS = 0x4;
private const int SIF_PAGE = 0x2;
private const int SIF_ALL = SIF_RANGE | SIF_PAGE | SIF_POS | SIF_TRACKPOS;
[DllImport("user32.dll", SetLastError = true)]
private static extern int GetScrollInfo(
IntPtr hWnd, int n, ref ScrollInfoStruct lpScrollInfo);
private struct ScrollInfoStruct
{
public int cbSize;
public int fMask;
public int nMin;
public int nMax;
public int nPage;
public int nPos;
public int nTrackPos;
}
protected override void WndProc(ref System.Windows.Forms.Message msg)
{
if (msg.Msg == WM_HSCROLL)
{
if (OnHorizontalScroll != null)
{
ScrollInfoStruct si = new ScrollInfoStruct();
si.fMask = SIF_ALL;
si.cbSize = Marshal.SizeOf(si);
GetScrollInfo(msg.HWnd, 0, ref si);
if (msg.WParam.ToInt32() == SB_ENDSCROLL)
{
ScrollEventArgs sargs = new ScrollEventArgs(
ScrollEventType.EndScroll,
si.nPos);
OnHorizontalScroll(this, sargs);
}
}
}
if (msg.Msg == WM_VSCROLL || msg.Msg == WM_MOUSEWHEEL)
{
if (OnVerticalScroll != null)
{
ScrollInfoStruct si = new ScrollInfoStruct();
si.fMask = SIF_ALL;
si.cbSize = Marshal.SizeOf(si);
GetScrollInfo(msg.HWnd, 0, ref si);
if (msg.WParam.ToInt32() == SB_ENDSCROLL)
{
ScrollEventArgs sargs = new ScrollEventArgs(
ScrollEventType.EndScroll,
si.nPos);
OnVerticalScroll(this, sargs);
}
}
}
base.WndProc(ref msg);
}
/*
* Listbox Styles
*/
private const int LBS_NOTIFY = 0x0001;
private const int LBS_SORT = 0x0002;
private const int LBS_NOREDRAW = 0x0004;
private const int LBS_MULTIPLESEL = 0x0008;
private const int LBS_OWNERDRAWFIXED = 0x0010;
private const int LBS_OWNERDRAWVARIABLE = 0x0020;
private const int LBS_HASSTRINGS = 0x0040;
private const int LBS_USETABSTOPS = 0x0080;
private const int LBS_NOINTEGRALHEIGHT = 0x0100;
private const int LBS_MULTICOLUMN = 0x0200;
private const int LBS_WANTKEYBOARDINPUT = 0x0400;
private const int LBS_EXTENDEDSEL = 0x0800;
private const int LBS_DISABLENOSCROLL = 0x1000;
private const int LBS_NODATA = 0x2000;
private const int LB_GETCOUNT = 0x018B;
private const int LB_SETCOUNT = 0x01A7;
private const int LB_SETSEL = 0x0185;
private const int LB_SETCURSEL = 0x0186;
private const int LB_GETSEL = 0x0187;
private const int LB_GETCURSEL = 0x0188;
private const int LB_GETSELCOUNT = 0x0190;
private const int LB_GETSELITEMS = 0x0191;
[DllImport("user32", CharSet = CharSet.Auto)]
private extern static int SendMessage(IntPtr hWnd, int msg, int wParam, IntPtr lParam);
#region Member Variables
private int selectedIndex = -1;
private VListBox.SelectedIndexCollection selectedIndices = null;
#endregion
/// <summary>
/// Constructs a new instance of this class.
/// </summary>
public VListBox() : base()
{
selectedIndices = new VListBox.SelectedIndexCollection(this);
}
public void DefaultDrawItem(
DrawItemEventArgs e,
String text, Brush foreGround
)
{
bool selected = ((e.State & DrawItemState.Selected) == DrawItemState.Selected);
if (selected)
{
e.Graphics.FillRectangle(SystemBrushes.Highlight, e.Bounds);
}
else
{
e.Graphics.FillRectangle(SystemBrushes.Window, e.Bounds);
}
e.Graphics.DrawString(
text,
this.Font,
//selected ? SystemBrushes.HighlightText : /*SystemBrushes.WindowText*/ foreGround,
foreGround,
new RectangleF(e.Bounds.X + 1, e.Bounds.Y + 1, e.Bounds.Width - 2, e.Bounds.Height - 2));
}
/// <summary>
/// Gets or sets the number of virtual items in the ListBox.
/// </summary>
public int Count
{
get
{
return SendMessage(this.Handle, LB_GETCOUNT, 0, IntPtr.Zero);
}
set
{
SendMessage(this.Handle, LB_SETCOUNT, value, IntPtr.Zero);
}
}
/// <summary>
/// Gets/sets the DrawMode of the ListBox. The DrawMode must always
/// be set to <see cref="System.Windows.Forms.DrawMode.OwnerDrawFixed"/>.
/// </summary>
[Browsable(false)]
public new System.Windows.Forms.DrawMode DrawMode
{
get
{
return System.Windows.Forms.DrawMode.OwnerDrawFixed;
}
set
{
if (value != System.Windows.Forms.DrawMode.OwnerDrawFixed)
{
throw new ArgumentException("DrawMode must be set to OwnerDrawFixed in a Virtual ListBox");
}
}
}
/// <summary>
/// Throws an exception. All the items for a Virtual ListBox are externally managed.
/// </summary>
[BrowsableAttribute(false)]
public new ObjectCollection Items
{
get
{
throw new InvalidOperationException("A Virtual ListBox does not have an Items collection.");
}
}
/// <summary>
/// Throws an exception. All the items for a Virtual ListBox are externally managed.
/// </summary>
/// <remarks>The selected index can be obtained using the <see cref="SelectedIndex"/> and
/// <see cref="SelectedIndices"/> properties.
/// </remarks>
[BrowsableAttribute(false)]
public new SelectedObjectCollection SelectedItems
{
get
{
throw new InvalidOperationException("A Virtual ListBox does not have a SelectedObject collection");
}
}
/// <summary>
/// Hides the Sorted property of the ListBox control. Any attempt to set this property
/// to true will result in an exception.
/// </summary>
[BrowsableAttribute(false)]
public new bool Sorted
{
get
{
return false;
}
set
{
if (value)
{
throw new InvalidOperationException("A Virtual ListBox cannot be sorted.");
}
}
}
/// <summary>
/// Returns the selected index in the control. If the control has the multi-select
/// style, then the first selected item is returned.
/// </summary>
public new int SelectedIndex
{
get
{
int selIndex = -1;
if (SelectionMode == System.Windows.Forms.SelectionMode.One)
{
selIndex = SendMessage(this.Handle, LB_GETCURSEL, 0, IntPtr.Zero);
}
else if ((SelectionMode == System.Windows.Forms.SelectionMode.MultiExtended) ||
(SelectionMode == System.Windows.Forms.SelectionMode.MultiSimple))
{
int selCount = SendMessage(this.Handle, LB_GETSELCOUNT, 0, IntPtr.Zero);
if (selCount > 0)
{
IntPtr buf = Marshal.AllocCoTaskMem(4);
SendMessage(this.Handle, LB_GETSELITEMS, 1, buf);
selIndex = Marshal.ReadInt32(buf);
Marshal.FreeCoTaskMem(buf);
}
}
return selIndex;
}
set
{
if (SelectionMode == System.Windows.Forms.SelectionMode.One)
{
SendMessage(this.Handle, LB_SETCURSEL, value, IntPtr.Zero);
}
else if ((SelectionMode == System.Windows.Forms.SelectionMode.MultiExtended) ||
(SelectionMode == System.Windows.Forms.SelectionMode.MultiSimple))
{
Console.WriteLine("Working on it");
}
}
}
/// <summary>
/// todo
/// </summary>
public new SelectedIndexCollection SelectedIndices
{
get
{
return selectedIndices;
}
}
/// <summary>
/// Gets the selection state for an item.
/// </summary>
/// <param name="index">Index of the item.</param>
/// <returns><c>true</c> if selected, <c>false</c> otherwise.</returns>
public bool ItemSelected(int index)
{
bool state = false;
if (SelectionMode == System.Windows.Forms.SelectionMode.One)
{
state = (SelectedIndex == index);
}
else if ((SelectionMode == System.Windows.Forms.SelectionMode.MultiExtended) ||
(SelectionMode == System.Windows.Forms.SelectionMode.MultiSimple))
{
state = (SendMessage(this.Handle, LB_GETSEL, index, IntPtr.Zero) != 0);
}
return state;
}
/// <summary>
/// Sets the selection state for an item.
/// </summary>
/// <param name="index">Index of the item.</param>
/// <param name="state">New selection state for the item.</param>
public void ItemSelected(int index, bool state)
{
if (SelectionMode == System.Windows.Forms.SelectionMode.One)
{
if (state)
{
SelectedIndex = index;
}
}
else if ((SelectionMode == System.Windows.Forms.SelectionMode.MultiExtended) ||
(SelectionMode == System.Windows.Forms.SelectionMode.MultiSimple))
{
SendMessage(this.Handle, LB_SETSEL, (state ? 1 : 0), (IntPtr) index);
}
}
/// <summary>
/// Called when an item in the control needs to be drawn, and raises the
/// <see cref="DrawItem"/> event.
/// </summary>
/// <param name="e">Details about the item that is to be drawn.</param>
protected override void OnDrawItem(DrawItemEventArgs e)
{
if ((e.State & DrawItemState.Selected ) == DrawItemState.Selected )
{
selectedIndex = e.Index;
}
base.OnDrawItem(e);
}
/// <summary>
/// Sets up the <see cref="CreateParams"/> object to tell Windows
/// how the ListBox control should be created. In this instance
/// the default configuration is modified to remove <c>LBS_HASSTRINGS</c>
/// and <c>LBS_SORT</c> styles and to add <c>LBS_NODATA</c>
/// and <c>LBS_OWNERDRAWFIXED</c> styles. This converts the ListBox
/// into a Virtual ListBox.
/// </summary>
protected override System.Windows.Forms.CreateParams CreateParams
{
get
{
CreateParams defParams = base.CreateParams;
Console.WriteLine("In Param style: {0:X8}", defParams.Style);
defParams.Style = defParams.Style & ~LBS_HASSTRINGS;
defParams.Style = defParams.Style & ~LBS_SORT;
defParams.Style = defParams.Style | LBS_OWNERDRAWFIXED | LBS_NODATA;
Console.WriteLine("Out Param style: {0:X8}", defParams.Style);
return defParams;
}
}
/// <summary>
/// Called when the ListBox handle is destroyed.
/// </summary>
/// <param name="e">Not used</param>
protected override void OnHandleDestroyed(EventArgs e)
{
// Nasty. The problem is with the call to NativeUpdateSelection,
// which calls the EnsureUpToDate on the SelectedObjectCollection method,
// and that is broken.
try
{
base.OnHandleDestroyed(e);
}
catch (Exception)
{
}
}
/// <summary>
/// Implements a read-only collection of selected items in the
/// VListBox.
/// </summary>
public new class SelectedIndexCollection : ICollection, IEnumerable
{
private VListBox owner = null;
/// <summary>
/// Creates a new instance of this class
/// </summary>
/// <param name="owner">The VListBox which owns the collection</param>
public SelectedIndexCollection(VListBox owner)
{
this.owner = owner;
}
/// <summary>
/// Returns an enumerator which allows iteration through the selected items
/// collection.
/// </summary>
/// <returns></returns>
public IEnumerator GetEnumerator()
{
return new SelectedIndexCollectionEnumerator(this.owner);
}
/// <summary>
/// Not implemented. Throws an exception.
/// </summary>
/// <param name="dest">Array to copy items to</param>
/// <param name="startIndex">First index in array to put items in.</param>
public void CopyTo(Array dest, int startIndex)
{
throw new InvalidOperationException("Not implemented");
}
/// <summary>
/// Returns the number of items in the collection.
/// </summary>
public int Count
{
get
{
return SendMessage(owner.Handle, LB_GETSELCOUNT, 0, IntPtr.Zero);
}
}
/// <summary>
/// Returns the selected item with the specified 0-based index in the collection
/// of selected items.
/// </summary>
/// <remarks>
/// Do not use this method to enumerate through all selected
/// items as it gets the collection of selected items each item it
/// is called. The <c>foreach</c> enumerator only gets the collection
/// of items once when it is constructed and is therefore quicker.
/// </remarks>
public int this[int index]
{
get
{
int selIndex = -1;
int selCount = SendMessage(owner.Handle, LB_GETSELCOUNT, 0, IntPtr.Zero);
if ((index < selCount) && (index > 0))
{
IntPtr buf = Marshal.AllocCoTaskMem(4 * (index + 1));
SendMessage(owner.Handle, LB_GETSELITEMS, selCount, buf);
selIndex = Marshal.ReadInt32(buf, index * 4);
Marshal.FreeCoTaskMem(buf);
}
else
{
throw new ArgumentException("Index out of bounds", "index");
}
return selIndex;
}
}
/// <summary>
/// Returns <c>false</c>. This collection is not synchronized for
/// concurrent access from multiple threads.
/// </summary>
public bool IsSynchronized
{
get
{
return false;
}
}
/// <summary>
/// Not implemented. Throws an exception.
/// </summary>
public object SyncRoot
{
get
{
throw new InvalidOperationException("Synchronization not supported.");
}
}
}
/// <summary>
/// Implements the <see cref="IEnumerator"/> interface for the selected indexes
/// within a <see cref="VListBox"/> control.
/// </summary>
public class SelectedIndexCollectionEnumerator : IEnumerator, IDisposable
{
private IntPtr buf = IntPtr.Zero;
private int size = 0;
private int offset = 0;
/// <summary>
/// Constructs a new instance of this class.
/// </summary>
/// <param name="owner">The <see cref="VListBox"/> which owns the collection.</param>
public SelectedIndexCollectionEnumerator(VListBox owner)
{
int selCount = SendMessage(owner.Handle, LB_GETSELCOUNT, 0, IntPtr.Zero);
if (selCount > 0)
{
buf = Marshal.AllocCoTaskMem(4 * selCount);
SendMessage(owner.Handle, LB_GETSELITEMS, selCount, buf);
}
}
/// <summary>
/// Clears up any resources associated with this enumerator.
/// </summary>
public void Dispose()
{
if (!buf.Equals(IntPtr.Zero))
{
Marshal.FreeCoTaskMem(buf);
buf = IntPtr.Zero;
}
}
/// <summary>
/// Resets the enumerator to the start of the list.
/// </summary>
public void Reset()
{
offset = 0;
}
/// <summary>
/// Returns the current object.
/// </summary>
public object Current
{
get
{
if (offset >= size)
{
throw new Exception("Collection is exhausted.");
}
else
{
int index = Marshal.ReadInt32(buf, offset * 4);
return (object) index;
}
}
}
/// <summary>
/// Advances the enumerator to the next element of the collection.
/// </summary>
/// <returns><c>true</c> if the enumerator was successfully advanced to the next element;
/// <c>false</c> if the enumerator has passed the end of the collection.</returns>
public bool MoveNext()
{
bool success = false;
offset++;
if (offset < size)
{
success = true;
}
return success;
}
}
}
}