private void OnLinkLabelLinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
Debug.Assert(!ActionPanel.InMethodInvoke, "Nested method invocation");
ActionPanel.InMethodInvoke = true;
try
{
_methodItem.Invoke();
}
catch (Exception ex)
{
if (ex is TargetInvocationException)
{
ex = ex.InnerException;
}
//NOTE: We had code to rethrow if this was one of [NullReferenceException, StackOverflowException, OutOfMemoryException,
//ThreadAbortException]. Removing this rethrow. StackOverflow and ThreadAbort can't be meaningfully caught, and
//NullRef and OutOfMemory really shouldn't be caught. Out of these, OOM is the most correct one to call, but OOM is
//thrown by GDI+ for pretty much any problem, so isn't reliable as an actual indicator that you're out of memory. If
//you really are out of memory, it's very likely you'll get another OOM shortly.
ActionPanel.ShowError(string.Format(SR.DesignerActionPanel_ErrorInvokingAction, _methodItem.DisplayName, Environment.NewLine + ex.Message));
}
finally
{
ActionPanel.InMethodInvoke = false;
}
}
private void ActivateDropDown()
{
if (_editor != null)
{
try
{
object newValue = _editor.EditValue(TypeDescriptorContext, this, Value);
SetValue(newValue);
}
catch (Exception ex)
{
ActionPanel.ShowError(string.Format(SR.DesignerActionPanel_ErrorActivatingDropDown, ex.Message));
}
}
else
{
ListBox listBox = new ListBox
{
BorderStyle = BorderStyle.None,
IntegralHeight = false,
Font = ActionPanel.Font
};
listBox.SelectedIndexChanged += new EventHandler(OnListBoxSelectedIndexChanged);
listBox.KeyDown += new KeyEventHandler(OnListBoxKeyDown);
TypeConverter.StandardValuesCollection standardValues = GetStandardValues();
if (standardValues != null)
{
foreach (object o in standardValues)
{
string newItem = PropertyDescriptor.Converter.ConvertToString(TypeDescriptorContext, CultureInfo.CurrentCulture, o);
listBox.Items.Add(newItem);
if ((o != null) && o.Equals(Value))
{
listBox.SelectedItem = newItem;
}
}
}
// All measurement code borrowed from WinForms PropertyGridView.cs
int maxWidth = 0;
// The listbox draws with GDI, not GDI+. So, we use a normal DC here.
using (var hdc = new User32.GetDcScope(listBox.Handle))
{
using var hFont = new Gdi32.ObjectScope(listBox.Font.ToHFONT());
using var fontSelection = new Gdi32.SelectObjectScope(hdc, hFont);
var tm = new Gdi32.TEXTMETRICW();
if (listBox.Items.Count > 0)
{
foreach (string s in listBox.Items)
{
var textSize = new Size();
Gdi32.GetTextExtentPoint32W(hdc, s, s.Length, ref textSize);
maxWidth = Math.Max(textSize.Width, maxWidth);
}
}
Gdi32.GetTextMetricsW(hdc, ref tm);
// border + padding + scrollbar
maxWidth += 2 + tm.tmMaxCharWidth + SystemInformation.VerticalScrollBarWidth;
listBox.Height = Math.Max(tm.tmHeight + 2, Math.Min(ListBoxMaximumHeight, listBox.PreferredHeight));
listBox.Width = Math.Max(maxWidth, EditRegionSize.Width);
_ignoreDropDownValue = false;
}
try
{
ShowDropDown(listBox, SystemColors.ControlDark);
}
finally
{
listBox.SelectedIndexChanged -= new EventHandler(OnListBoxSelectedIndexChanged);
listBox.KeyDown -= new KeyEventHandler(OnListBoxKeyDown);
}
if (!_ignoreDropDownValue)
{
if (listBox.SelectedItem != null)
{
SetValue(listBox.SelectedItem);
}
}
}
}
