// Helper method which will invoke the MouseOverItem event.
private void HandleMouseOverItem()
{
// cbSize must be set before calling GetComboBoxInfo.
COMBOBOXINFO pcbi = new COMBOBOXINFO();
pcbi.cbSize = Marshal.SizeOf(pcbi);
// Get combo box information.
GetComboBoxInfo(Handle, ref pcbi);
// Check for invalid pointer... just in case.
if (pcbi.hwndList == IntPtr.Zero)
{
return;
}
// Current position of cursor.
POINT pt = Cursor.Position;
/* LBItemFromPt will return the Index of the Item on success.
** The documentation states that this function will return zero
** if it fails. That is not true though. It will return 0 for the
** first item in the list box. This function returns -1 on error! */
int retVal = LBItemFromPt(pcbi.hwndList, pt, false);
if (retVal == -1)
{
return;
}
// Invoke the event.
MouseOverItem?.Invoke(this, new MouseOverEventArgs(retVal));
}
public ClientInfoForm()
{
InitializeComponent();
CboClientName.HandleCreated += (s, e) =>
{
COMBOBOXINFO combo = new COMBOBOXINFO();
combo.cbSize = Marshal.SizeOf(combo);
GetComboBoxInfo(CboClientName.Handle, out combo);
hwnd1 = combo.hwndList;
init1 = false;
};
CboFarmName.HandleCreated += (s, e) =>
{
COMBOBOXINFO combo = new COMBOBOXINFO();
combo.cbSize = Marshal.SizeOf(combo);
GetComboBoxInfo(CboFarmName.Handle, out combo);
hwnd2 = combo.hwndList;
init2 = false;
};
CboFruitName.HandleCreated += (s, e) =>
{
COMBOBOXINFO combo = new COMBOBOXINFO();
combo.cbSize = Marshal.SizeOf(combo);
GetComboBoxInfo(CboFruitName.Handle, out combo);
hwnd3 = combo.hwndList;
init3 = false;
};
}
public static void Register(ComboBox combo)
{
Data data = new Data()
{
combo = combo
};
Action assign = () => {
COMBOBOXINFO info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
SendMessageCb(combo.Handle, 0x164, IntPtr.Zero, out info);
dict[combo] = data;
data.nwList = new NW(info.hwndList);
};
if (!combo.IsHandleCreated)
{
combo.HandleCreated += delegate { assign(); }
}
;
else
{
assign();
}
combo.HandleDestroyed += delegate {
data.Dispose();
};
}
private static COMBOBOXINFO GetComboBoxInfo(Control control)
{
COMBOBOXINFO info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(control.Handle, ref info);
return(info);
}
/// <summary>
/// Gets the list control of a combo box
/// </summary>
/// <param name="handle">Handle of the combo box itself</param>
/// <returns>A handle to the list</returns>
public static IntPtr GetListHandle(IntPtr handle)
{
COMBOBOXINFO info;
info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
return(GetComboBoxInfo(handle, ref info) ? info.hwndList : IntPtr.Zero);
}
public TextWindow(ComboBox cb)
{
COMBOBOXINFO info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
SendMessageCb(cb.Handle, 0x164, IntPtr.Zero, out info);
this.AssignHandle(info.hwndEdit);
}
/// <summary>
/// Retrieves ComboBox Handle
/// </summary>
/// <param name="CASCombo"></param>
/// <returns></returns>
public IntPtr CASGetHandle(ComboBox CASCombo)
{
COMBOBOXINFO CASCBI = new COMBOBOXINFO(); //New ComboBox Settings Object
CASCBI.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(CASCBI); //Call In Correct Size
GetComboBoxInfo(CASCombo.Handle, ref CASCBI); //Obtain Handle
return(CASCBI.hwndList); //Return Handle
}
public static void SetWatermark(ComboBox comboBox, string watermarkText)
{
//a combobox is made up of three controls, a button, a list and textbox;
//we want the textbox
COMBOBOXINFO info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(comboBox.Handle, ref info);
SendMessage(info.hwndItem, EM_SETCUEBANNER, 0, watermarkText);
}
public static COMBOBOXINFO FromComboBox(System.Windows.Forms.ComboBox cb)
{
if (!cb.IsHandleCreated)
throw new ArgumentException("ComboBox must have its handle created.", "cb");
var cbi = new COMBOBOXINFO() { cbSize = Marshal.SizeOf(typeof(COMBOBOXINFO)) };
GetComboBoxInfo(cb.Handle, ref cbi);
return cbi;
}
private static COMBOBOXINFO GetComboBoxInfo(Control control)
{
COMBOBOXINFO info = new COMBOBOXINFO();
//a combobox is made up of three controls, a button, a list and textbox;
//we want the textbox
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(control.Handle, ref info);
return info;
}
protected override void OnCreateControl()
{
base.OnCreateControl();
COMBOBOXINFO info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(Handle, ref info);
_ehandle = info.hwndEdit;
_lhandle = info.hwndList;
}
protected override void OnHandleCreated(EventArgs e)
{
base.OnHandleCreated(e);
var x = new COMBOBOXINFO();
x.cbSize = (uint)Marshal.SizeOf(typeof(COMBOBOXINFO));
var b = User32.GetComboBoxInfo(Handle, ref x);
_listBoxDefaultWndProc = NativeUtility.SetWindowProc(x.hwndList, _listBoxWndProc);
}
public static void SetWatermark(ComboBox comboBox, string watermarkText)
{
//a combobox is made up of three controls, a button, a list and textbox;
//we want the textbox
COMBOBOXINFO info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(comboBox.Handle, ref info);
SendMessage(info.hwndItem, EM_SETCUEBANNER, 0, watermarkText);
}
public Form1()
{
InitializeComponent();
HandleCreated += (s, e) => {
COMBOBOXINFO combo = new COMBOBOXINFO();
combo.cbSize = Marshal.SizeOf(combo);
GetComboBoxInfo(comboBox1.Handle, out combo);
hwnd = combo.hwndList;
};
}
private static COMBOBOXINFO GetComboBoxInfo(Control control)
{
COMBOBOXINFO info = new COMBOBOXINFO();
//a combobox is made up of three controls, a button, a list and textbox;
//we want the textbox
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(control.Handle, ref info);
return(info);
}
private void SetupEdit()
{
var info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(this.Handle, ref info);
var style = GetWindowLong(info.hwndEdit, GWL_STYLE);
style |= 1;
SetWindowLong(info.hwndEdit, GWL_STYLE, style);
}
protected override void OnDropDown(EventArgs e)
{
// Install wrapper
base.OnDropDown(e);
// Retrieve handle to dropdown list
COMBOBOXINFO info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
SendMessageCb(this.Handle, 0x164, IntPtr.Zero, out info);
mDropdown = new DropdownWindow(this);
mDropdown.AssignHandle(info.hwndList);
}
protected override void OnDropDown(EventArgs e)
{
// Install wrapper
base.OnDropDown(e);
// Retrieve handle to dropdown list
COMBOBOXINFO info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
SendMessageCb(this.Handle, 0x164, IntPtr.Zero, out info);
mDropdown = new DropdownWindow(this);
mDropdown.AssignHandle(info.hwndList);
}
public static void SetCueText(Control control, string text)
{
if (control is ComboBox)
{
COMBOBOXINFO info = GetComboBoxInfo(control);
SendMessage(info.hwndItem, EM_SETCUEBANNER, 0, text);
}
else
{
SendMessage(control.Handle, EM_SETCUEBANNER, 0, text);
}
}
/// <summary>
/// 设置控件的暗示信息。
/// </summary>
/// <param name="owner">控件拥有者。</param>
/// <param name="text">暗示信息。</param>
public static void SetCueText(this Control owner, string text)
{
if (owner is ComboBox)
{
COMBOBOXINFO info = GetComboBoxInfo(owner);
SendMessage(info.hwndItem, EM_SETCUEBANNER, 0, text);
}
else
{
SendMessage(owner.Handle, EM_SETCUEBANNER, 0, text);
}
}
private void SetupEdit()
{
var info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(this.Handle, ref info);
SetWindowPos(info.hwndEdit, IntPtr.Zero, 3,
(this.Height - Font.Height) / 2,
ClientRectangle.Width - buttonWidth - 3,
ClientRectangle.Height - Font.Height - 4,
SWP_NOZORDER);
}
/// <summary>
///
/// </summary>
public ComboBoxPlus()
{
this.DrawMode = DrawMode.OwnerDrawFixed;
this.AddItemString = "添加新项";
this.Items.Add(AddItemString);
this.HandleCreated += (s, e) =>
{
COMBOBOXINFO combo = new COMBOBOXINFO();
combo.cbSize = Marshal.SizeOf(combo);
GetComboBoxInfo(this.Handle, out combo);
hwnd = combo.hwndList;
init = false;
};
}
public static COMBOBOXINFO FromComboBox(System.Windows.Forms.ComboBox cb)
{
if (!cb.IsHandleCreated)
{
throw new ArgumentException("ComboBox must have its handle created.", "cb");
}
var cbi = new COMBOBOXINFO()
{
cbSize = Marshal.SizeOf(typeof(COMBOBOXINFO))
};
GetComboBoxInfo(cb.Handle, ref cbi);
return(cbi);
}
public static COMBOBOXINFO FromHandle(HandleRef hComboBox)
{
if (hComboBox.Handle == IntPtr.Zero)
{
throw new ArgumentException("ComboBox handle cannot be NULL.", nameof(hComboBox));
}
var cbi = new COMBOBOXINFO()
{
cbSize = Marshal.SizeOf(typeof(COMBOBOXINFO))
};
SendMessage(hComboBox, ComboBoxMessage.CB_GETCOMBOBOXINFO, 0, ref cbi);
return(cbi);
}
private static string GetCueText(Control control)
{
var builder = new StringBuilder();
if (control is ComboBox)
{
var info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(control.Handle, ref info);
SendMessage(info.hwndItem, EM_GETCUEBANNER, 0, builder);
}
else
{
SendMessage(control.Handle, EM_GETCUEBANNER, 0, builder);
}
return(builder.ToString());
}
private void UpdateHint()
{
if (!this.IsHandleCreated)
{
return;
}
if (DropDownStyle == ComboBoxStyle.DropDownList)
{
this.Invalidate();
}
else
{
var info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(Handle, ref info);
SendMessage(Handle, CB_SETCUEBANNER, 0, Hint);
}
}
public static string GetCueText(Control control)
{
StringBuilder builder = new StringBuilder();
if (control is ComboBox)
{
COMBOBOXINFO info = new COMBOBOXINFO();
//a combobox is made up of two controls, a list and textbox;
//we want the textbox
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(control.Handle, ref info);
SendMessage(info.hwndItem, EM_GETCUEBANNER, 0, builder);
}
else
{
SendMessage(control.Handle, EM_GETCUEBANNER, 0, builder);
}
return builder.ToString();
}
public static void Placeholder(Control control, string placeholder)
{
try
{
if (control is ComboBox)
{
COMBOBOXINFO info = GetComboBoxInfo(control);
SendMessage(info.hwndItem, EM_SETCUEBANNER, 0, placeholder);
}
else
{
SendMessage(control.Handle, EM_SETCUEBANNER, 0, placeholder);
}
}
catch (Exception)
{
}
}
public static void Go(String s)
{
FoundComboHwnd = (IntPtr)0;
FoundButtonHwnd = (IntPtr)0;
EnumChildWindows(MonitorThread.HandledHwnd, EnumChildWindowsCallback, (IntPtr)0);
COMBOBOXINFO info;
info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(FoundComboHwnd, ref info);
String x = WindowMessageClass.GetControlText(info.hwndEdit);
x = Path.GetFileNameWithoutExtension(x) + s + Path.GetExtension(x);
WindowMessageClass.SetControlText(info.hwndEdit, x);
WindowMessageClass.ClickControl(FoundButtonHwnd);
}
public static string GetCueText(Control control)
{
var result = String.Empty;
if (control is ComboBox)
{
COMBOBOXINFO info = new COMBOBOXINFO();
//a combobox is made up of two controls, a list and textbox;
//we want the textbox
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(control.Handle, ref info);
SendMessage(info.hwndItem, EM_GETCUEBANNER, IntPtr.Zero, result);
}
else
{
SendMessage(control.Handle, EM_GETCUEBANNER, IntPtr.Zero, result);
}
return(result);
}
public static string GetCueText(Control control)
{
StringBuilder builder = new StringBuilder();
if (control is ComboBox)
{
COMBOBOXINFO info = new COMBOBOXINFO();
//a combobox is made up of two controls, a list and textbox;
//we want the textbox
info.cbSize = Marshal.SizeOf(info);
GetComboBoxInfo(control.Handle, ref info);
SendMessage(info.hwndItem, EM_GETCUEBANNER, 0, builder);
}
else
{
SendMessage(control.Handle, EM_GETCUEBANNER, 0, builder);
}
return(builder.ToString());
}
protected override void OnDropDown(EventArgs e)
{
// Is dropdown off the right side of the screen?
Point pos = this.PointToScreen(this.Location);
Screen scr = Screen.FromPoint(pos);
if (scr.WorkingArea.Right < pos.X + this.DropDownWidth)
{
this.BeginInvoke(new Action(() => {
// Retrieve handle to dropdown list
COMBOBOXINFO info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
SendMessageCb(this.Handle, 0x164, IntPtr.Zero, out info);
// Move the dropdown window
RECT rc;
GetWindowRect(info.hwndList, out rc);
int x = scr.WorkingArea.Right - (rc.Right - rc.Left);
SetWindowPos(info.hwndList, IntPtr.Zero, x, rc.Top, 0, 0, 5);
}));
}
base.OnDropDown(e);
}
private static extern bool GetComboBoxInfo(IntPtr hwnd, ref COMBOBOXINFO pcbi);
public static extern bool GetComboBoxInfo(IntPtr hWnd, ref COMBOBOXINFO pcbi);
public static extern int GetComboBoxInfo(IntPtr hWnd, ref COMBOBOXINFO pcbi); //Retrieve Info About Specified Combo Box
private static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, ref COMBOBOXINFO lParam);
private RECT comboButton()
{
int width = _oComboboxBitmap.Width / 4;
COMBOBOXINFO cbi = new COMBOBOXINFO();
RECT tr = new RECT();
// get button size
cbi.cbSize = Marshal.SizeOf(cbi);
if (SendMessage(_hComboWnd, CB_GETCOMBOBOXINFO, 0, ref cbi) != 0)
{
tr = cbi.rcButton;
}
else
{
ComboBox cb = (ComboBox)Control.FromHandle(_hComboWnd);
tr = new RECT(cb.ClientRectangle.Width - width, 1, width, cb.ClientRectangle.Height - 2);
}
return tr;
}
private static extern bool GetComboBoxInfo(IntPtr hwnd, ref COMBOBOXINFO pcbi);
public static extern bool GetComboBoxInfo(
IntPtr hwndCombo,
ref COMBOBOXINFO info);
private static extern IntPtr SendMessageCb(IntPtr hWnd, int msg, IntPtr wp, out COMBOBOXINFO lp);
/// <summary>
/// Gets the list control of a combo box
/// </summary>
/// <param name="handle">Handle of the combo box itself</param>
/// <returns>A handle to the list</returns>
public static IntPtr GetListHandle(IntPtr handle)
{
COMBOBOXINFO info;
info = new COMBOBOXINFO();
info.cbSize = Marshal.SizeOf(info);
return GetComboBoxInfo(handle, ref info) ? info.hwndList : IntPtr.Zero;
}
private bool InitializeHandle(Control ctrl)
{
IntPtr oldTargetHandle = _targetHandle;
if (ctrl is ComboBox)
{
_referenceControl = ctrl;
COMBOBOXINFO cbInfo = new COMBOBOXINFO();
cbInfo.cbSize = Marshal.SizeOf(cbInfo);
GetComboBoxInfo(((Control)ctrl).Handle, ref cbInfo);
_targetHandle = cbInfo.hwndList;
}
else
{
_referenceControl = ctrl;
_targetHandle = ctrl.Handle;
}
if ((_targetHandle != oldTargetHandle) && (_targetHandle != IntPtr.Zero))
{
if (_oldWndProcPointer == IntPtr.Zero)
_oldWndProcPointer = (IntPtr)GetWindowLong(_targetHandle, GWL_WNDPROC);
else
{
if (oldTargetHandle != IntPtr.Zero)
SetWindowLong(_targetHandle, GWL_WNDPROC, _oldWndProcPointer);
}
if (_newWndProcPointer == IntPtr.Zero)
{
_newWndProc = new WndProcDelegate(WndProc);
_newWndProcPointer = Marshal.GetFunctionPointerForDelegate(_newWndProc);
}
SetWindowLong(_targetHandle, GWL_WNDPROC, _newWndProcPointer);
return true;
}
else
return false;
}
internal static extern bool GetComboBoxInfo(IntPtr hWnd,
ref COMBOBOXINFO pcbi);
