/// <summary>Called when the control needs to handle the keyboard</summary>
public override bool HandleKeyboard(WindowMessage msg, IntPtr wParam, IntPtr lParam)
{
if (!IsEnabled || !IsVisible)
{
return(false);
}
// Let the scroll bar have a chance to handle it first
if (scrollbarControl.HandleKeyboard(msg, wParam, lParam))
{
return(true);
}
switch (msg)
{
case WindowMessage.KeyDown:
{
switch ((Keys)wParam.ToInt32())
{
case Keys.Up:
case Keys.Down:
case Keys.Next:
case Keys.Prior:
case Keys.Home:
case Keys.End:
{
// If no items exists, do nothing
if (itemList.Count == 0)
{
return(true);
}
int oldSelected = selectedIndex;
// Adjust selectedIndex
switch ((Keys)wParam.ToInt32())
{
case Keys.Up:
--selectedIndex;
break;
case Keys.Down:
++selectedIndex;
break;
case Keys.Next:
selectedIndex += scrollbarControl.PageSize - 1;
break;
case Keys.Prior:
selectedIndex -= scrollbarControl.PageSize - 1;
break;
case Keys.Home:
selectedIndex = 0;
break;
case Keys.End:
selectedIndex = itemList.Count - 1;
break;
}
// Clamp the item
if (selectedIndex < 0)
{
selectedIndex = 0;
}
if (selectedIndex >= itemList.Count)
{
selectedIndex = itemList.Count - 1;
}
// Did the selection change?
if (oldSelected != selectedIndex)
{
if (ctrlStyle == ListBoxStyle.MultiSelection)
{
// Clear all selection
for (int i = 0; i < itemList.Count; i++)
{
ListItem lbi = itemList[i];
lbi.IsItemSelected = false;
itemList[i] = lbi;
}
// Is shift being held down?
bool shiftDown = WinFormsUtils.IsKeyDown(Keys.ShiftKey);
if (shiftDown)
{
// Select all items from the start selection to current selected index
int end = Math.Max(selectedStarted, selectedIndex);
for (int i = Math.Min(selectedStarted, selectedIndex); i <= end; ++i)
{
ListItem lbi = itemList[i];
lbi.IsItemSelected = true;
itemList[i] = lbi;
}
}
else
{
ListItem lbi = itemList[selectedIndex];
lbi.IsItemSelected = true;
itemList[selectedIndex] = lbi;
// Update selection start
selectedStarted = selectedIndex;
}
}
else // Update selection start
{
selectedStarted = selectedIndex;
}
// adjust scrollbar
scrollbarControl.ShowItem(selectedIndex);
RaiseSelectionEvent(this, true);
}
}
return(true);
}
break;
}
}
return(false);
}
/// <summary>Handle keyboard input to the edit box</summary>
public override bool HandleKeyboard(WindowMessage msg, IntPtr wParam, IntPtr lParam)
{
if (!IsEnabled || !IsVisible)
{
return(false);
}
// Default to not handling the message
bool isHandled = false;
if (msg == WindowMessage.KeyDown)
{
switch ((Keys)wParam.ToInt32())
{
case Keys.End:
case Keys.Home:
// Move the caret
PlaceCaret(wParam.ToInt32() == (int)Keys.End ? textData.Text.Length : 0);
if (!WinFormsUtils.IsKeyDown(Keys.ShiftKey))
{
// Shift is not down. Update selection start along with caret
textData.SelectionStart = caretPosition;
}
ResetCaretBlink();
isHandled = true;
break;
case Keys.Insert:
if (WinFormsUtils.IsKeyDown(Keys.ControlKey))
{
// Control insert -> Copy to clipboard
CopyToClipboard();
}
else if (WinFormsUtils.IsKeyDown(Keys.ShiftKey))
{
// Shift insert -> Paste from clipboard
PasteFromClipboard();
}
else
{
// Toggle insert mode
isInsertMode = !isInsertMode;
}
break;
case Keys.Delete:
// Check to see if there is a text selection
if (caretPosition != textData.SelectionStart)
{
DeleteSelectionText();
RaiseChangedEvent(this, true);
}
else
{
if (caretPosition < textData.Text.Length)
{
// Deleting one character
textData.Text = textData.Text.Remove(caretPosition, 1);
RaiseChangedEvent(this, true);
}
}
ResetCaretBlink();
isHandled = true;
break;
case Keys.Left:
if (WinFormsUtils.IsKeyDown(Keys.ControlKey))
{
// Control is down. Move the caret to a new item
// instead of a character.
}
else if (caretPosition > 0)
{
PlaceCaret(caretPosition - 1); // Move one to the left
}
if (!WinFormsUtils.IsKeyDown(Keys.ShiftKey))
{
// Shift is not down. Update selection
// start along with the caret.
textData.SelectionStart = caretPosition;
}
ResetCaretBlink();
isHandled = true;
break;
case Keys.Right:
if (WinFormsUtils.IsKeyDown(Keys.ControlKey))
{
// Control is down. Move the caret to a new item
// instead of a character.
}
else if (caretPosition < textData.Text.Length)
{
PlaceCaret(caretPosition + 1); // Move one to the left
}
if (!WinFormsUtils.IsKeyDown(Keys.ShiftKey))
{
// Shift is not down. Update selection
// start along with the caret.
textData.SelectionStart = caretPosition;
}
ResetCaretBlink();
isHandled = true;
break;
case Keys.Up:
case Keys.Down:
// Trap up and down arrows so that the dialog
// does not switch focus to another control.
isHandled = true;
break;
default:
// Let the application handle escape
isHandled = ((Keys)wParam.ToInt32()) == Keys.Escape;
break;
}
}
return(isHandled);
}
