/// <summary>
/// Required UITypeEditor override. Opens dropdown modally
/// and waits for user input.
/// </summary>
/// <param name="context">The descriptor context. Used to retrieve
/// the live instance and other data.</param>
/// <param name="provider">The service provider for the given context.</param>
/// <param name="value">The current property value</param>
/// <returns>The updated property value, or the orignal value to effect a cancel</returns>
public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
{
IWindowsFormsEditorService editor = provider.GetService(typeof(IWindowsFormsEditorService)) as IWindowsFormsEditorService;
if (editor != null)
{
object newObject = value;
// Get the tree contents
ITree tree = GetTree(context, value);
// Proceed if there is anything to show
// Don't check tree.VisibleItemCount. Allows the derived class to display an empty dropdown
// by returning a tree with no visible elements.
if (tree != null)
{
// Create a listbox with its events
using (DropDownTreeControl treeControl = new DropDownTreeControl())
{
if (UseStandardCheckBoxes)
{
ImageList images = new ImageList();
images.ImageSize = new Size(16, 16);
treeControl.ImageList = images;
treeControl.StandardCheckBoxes = true;
}
treeControl.BindingContextChanged += new EventHandler(HandleBindingContextChanged);
treeControl.AfterDoubleClick += delegate(object sender, DoubleClickEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
editor.CloseDropDown();
}
};
// Manage the size of the control
Size lastSize = LastControlSize;
if (!lastSize.IsEmpty)
{
treeControl.Size = lastSize;
}
myInitialSelectionValue = value;
// Show the dropdown. This is modal.
IMultiColumnTree multiTree = tree as IMultiColumnTree;
if (multiTree != null)
{
treeControl.MultiColumnTree = multiTree;
}
else
{
#if VISUALSTUDIO_9_0 // MSBUG: Hack workaround crashing bug in VirtualTreeControl.OnToggleExpansion
treeControl.ColumnPermutation = new ColumnPermutation(1, new int[] { 0 }, false);
#endif
treeControl.Tree = tree;
}
Control adornedControl = SetTreeControlDisplayOptions(treeControl) ?? treeControl;
bool escapePressed = false;
EditorUtility.AttachEscapeKeyPressedEventHandler(
adornedControl,
delegate(object sender, EventArgs e)
{
escapePressed = true;
});
// Make sure keystrokes are not forwarded while the modal dropdown is open
IVirtualTreeInPlaceControl virtualTreeInPlaceControl = editor as IVirtualTreeInPlaceControl;
VirtualTreeInPlaceControlFlags flags = virtualTreeInPlaceControl != null ? virtualTreeInPlaceControl.Flags : 0;
if (0 != (flags & VirtualTreeInPlaceControlFlags.ForwardKeyEvents))
{
virtualTreeInPlaceControl.Flags = flags & ~VirtualTreeInPlaceControlFlags.ForwardKeyEvents;
}
editor.DropDownControl(adornedControl);
// Restore keystroke forwarding
if (0 != (flags & VirtualTreeInPlaceControlFlags.ForwardKeyEvents))
{
virtualTreeInPlaceControl.Flags = flags;
}
// Record the final size, we'll use it next time for this type of control
LastControlSize = treeControl.Size;
// Make sure the user didn't cancel, and give derived classes a chance
// to translate the value displayed in the tree to an appropriately
// typed value for the associated property.
if (!escapePressed)
{
int lastRow = treeControl.LastSelectedRow;
int lastColumn = treeControl.LastSelectedColumn;
if (lastRow != -1 || AlwaysTranslateToValue)
{
newObject = TranslateToValue(context, value, tree, lastRow, lastColumn);
}
}
}
}
return(newObject);
}
return(value);
}
/// <summary>
/// Required UITypeEditor override. Opens dropdown modally
/// and waits for user input.
/// </summary>
/// <param name="context">The descriptor context. Used to retrieve
/// the live instance and other data.</param>
/// <param name="provider">The service provider for the given context.</param>
/// <param name="value">The current property value</param>
/// <returns>The updated property value, or the orignal value to effect a cancel</returns>
public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
{
IWindowsFormsEditorService editor = provider.GetService(typeof(IWindowsFormsEditorService)) as IWindowsFormsEditorService;
if (editor != null)
{
object newObject = value;
// Get the list contents and add a null handler if needed
IList elements = GetContentList(context, value);
string nullText = NullItemText;
// Proceed if there is anything to show
if (nullText != null || (elements != null && elements.Count != 0))
{
// Create a tree control
using (DropDownTreeControl treeControl = new DropDownTreeControl())
{
#if VISUALSTUDIO_9_0 // MSBUG: Hack workaround crashing bug in VirtualTreeControl.OnToggleExpansion
treeControl.ColumnPermutation = new ColumnPermutation(1, new int[] { 0 }, false);
#endif
// Close the dropdown after a double click
treeControl.AfterDoubleClick += delegate(object sender, DoubleClickEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
editor.CloseDropDown();
}
};
// Create a tree for the control
ITree tree = new VirtualTree();
tree.Root = new SimpleBranch(this, elements, nullText);
treeControl.Tree = tree;
// Manage the size of the control
Size lastSize = LastControlSize;
if (!lastSize.IsEmpty)
{
treeControl.Size = lastSize;
}
int initialIndex = -1;
if (value != null)
{
if (elements != null)
{
initialIndex = elements.IndexOf(TranslateToDisplayObject(value, elements));
if (nullText != null)
{
++initialIndex;
}
}
}
else if (nullText != null)
{
initialIndex = 0;
}
if (initialIndex != -1)
{
treeControl.InitialSelectionIndex = initialIndex;
}
Control adornedControl = SetTreeControlDisplayOptions(treeControl) ?? treeControl;
bool escapePressed = false;
EditorUtility.AttachEscapeKeyPressedEventHandler(
adornedControl,
delegate(object sender, EventArgs e)
{
escapePressed = true;
});
// Make sure keystrokes are not forwarded while the modal dropdown is open
IVirtualTreeInPlaceControl virtualTreeInPlaceControl = editor as IVirtualTreeInPlaceControl;
VirtualTreeInPlaceControlFlags flags = virtualTreeInPlaceControl != null ? virtualTreeInPlaceControl.Flags : 0;
if (0 != (flags & VirtualTreeInPlaceControlFlags.ForwardKeyEvents))
{
virtualTreeInPlaceControl.Flags = flags & ~VirtualTreeInPlaceControlFlags.ForwardKeyEvents;
}
// Show the dropdown. This is modal.
editor.DropDownControl(adornedControl);
// Restore keystroke forwarding
if (0 != (flags & VirtualTreeInPlaceControlFlags.ForwardKeyEvents))
{
virtualTreeInPlaceControl.Flags = flags;
}
// Record the final size, we'll use it next time for this type of control
LastControlSize = treeControl.Size;
// Make sure the user didn't cancel, and translate the null placeholder
// back to null if necessary
if (!escapePressed)
{
int lastIndex = treeControl.AnchorIndex;
if (lastIndex != -1)
{
if (nullText != null)
{
--lastIndex;
if (lastIndex == -1)
{
newObject = null;
}
else
{
newObject = elements[lastIndex];
}
}
else
{
newObject = elements[lastIndex];
}
// Give the caller the chance to change the type of the chosen object
newObject = TranslateFromDisplayObject(lastIndex, newObject);
}
}
}
}
return(newObject);
}
return(value);
}
