/// <include file='doc\ComboBox.uex' path='docs/doc[@for="ComboBox.OnHandleCreated"]/*' />
/// <devdoc>
/// Overridden to make sure all the items and styles get set up correctly.
/// Inheriting classes should not forget to call
/// base.OnHandleCreated()
/// </devdoc>
/// <internalonly/>
protected override void OnHandleCreated(EventArgs e) {
base.OnHandleCreated(e);
if (MaxLength > 0) {
SendMessage(NativeMethods.CB_LIMITTEXT, MaxLength, 0);
}
// Get the handles and wndprocs of the ComboBox's child windows
//
Debug.Assert(childEdit == null, "Child edit window already attached");
Debug.Assert(childListBox == null, "Child listbox window already attached");
bool ok = childEdit == null && childListBox == null;
if (ok && DropDownStyle != ComboBoxStyle.DropDownList) {
IntPtr hwnd = UnsafeNativeMethods.GetWindow(new HandleRef(this, Handle), NativeMethods.GW_CHILD);
if (hwnd != IntPtr.Zero) {
// if it's a simple dropdown list, the first HWND is the list box.
//
if (DropDownStyle == ComboBoxStyle.Simple) {
childListBox = new ComboBoxChildNativeWindow(this);
childListBox.AssignHandle(hwnd);
// get the edits hwnd...
//
hwnd = UnsafeNativeMethods.GetWindow(new HandleRef(this, hwnd), NativeMethods.GW_HWNDNEXT);
}
childEdit = new ComboBoxChildNativeWindow(this);
childEdit.AssignHandle(hwnd);
// set the initial margin for combobox to be zero (this is also done whenever the font is changed).
//
UnsafeNativeMethods.SendMessage(new HandleRef(this, childEdit.Handle), NativeMethods.EM_SETMARGINS,
NativeMethods.EC_LEFTMARGIN | NativeMethods.EC_RIGHTMARGIN, 0);
}
}
bool found;
int dropDownWidth = Properties.GetInteger(PropDropDownWidth, out found);
if (found) {
SendMessage(NativeMethods.CB_SETDROPPEDWIDTH, dropDownWidth, 0);
}
found = false;
int itemHeight = Properties.GetInteger(PropItemHeight, out found);
if (found) {
// someone has set the item height - update it
UpdateItemHeight();
}
// Resize a simple style combobox on handle creation
// to respect the requested height.
//
if (DropDownStyle == ComboBoxStyle.Simple) {
Height = requestedHeight;
}
//If HandleCreated set the AutoComplete...
//this function checks if the correct properties are set to enable AutoComplete feature on combobox.
try
{
fromHandleCreate = true;
SetAutoComplete(false, false);
}
finally
{
fromHandleCreate = false;
}
if (itemsCollection != null) {
foreach (object item in itemsCollection) {
NativeAdd(item);
}
// Now udpate the current selection.
//
if (selectedIndex >= 0) {
SendMessage(NativeMethods.CB_SETCURSEL, selectedIndex, 0);
UpdateText();
selectedIndex = -1;
}
}
// NOTE: Setting SelectedIndex must be the last thing we do. See ASURT 73949.
}
/// <devdoc>
/// Release the ChildWindow object by un-subclassing the child edit and
/// list controls and freeing the root of the ChildWindow object.
/// </devdoc>
private void ReleaseChildWindow() {
if (childEdit != null) {
childEdit.ReleaseHandle();
childEdit = null;
}
if (childListBox != null) {
childListBox.ReleaseHandle();
childListBox = null;
}
}
protected override void OnHandleCreated(EventArgs e)
{
bool flag2;
base.OnHandleCreated(e);
if (this.MaxLength > 0)
{
base.SendMessage(0x141, this.MaxLength, 0);
}
if (((this.childEdit == null) && (this.childListBox == null)) && (this.DropDownStyle != ComboBoxStyle.DropDownList))
{
IntPtr window = System.Windows.Forms.UnsafeNativeMethods.GetWindow(new HandleRef(this, base.Handle), 5);
if (window != IntPtr.Zero)
{
if (this.DropDownStyle == ComboBoxStyle.Simple)
{
this.childListBox = new ComboBoxChildNativeWindow(this);
this.childListBox.AssignHandle(window);
window = System.Windows.Forms.UnsafeNativeMethods.GetWindow(new HandleRef(this, window), 2);
}
this.childEdit = new ComboBoxChildNativeWindow(this);
this.childEdit.AssignHandle(window);
System.Windows.Forms.UnsafeNativeMethods.SendMessage(new HandleRef(this, this.childEdit.Handle), 0xd3, 3, 0);
}
}
int integer = base.Properties.GetInteger(PropDropDownWidth, out flag2);
if (flag2)
{
base.SendMessage(0x160, integer, 0);
}
flag2 = false;
base.Properties.GetInteger(PropItemHeight, out flag2);
if (flag2)
{
this.UpdateItemHeight();
}
if (this.DropDownStyle == ComboBoxStyle.Simple)
{
base.Height = this.requestedHeight;
}
try
{
this.fromHandleCreate = true;
this.SetAutoComplete(false, false);
}
finally
{
this.fromHandleCreate = false;
}
if (this.itemsCollection != null)
{
foreach (object obj2 in this.itemsCollection)
{
this.NativeAdd(obj2);
}
if (this.selectedIndex >= 0)
{
base.SendMessage(0x14e, this.selectedIndex, 0);
this.UpdateText();
this.selectedIndex = -1;
}
}
}
