bradsmith1985 / dropdowncontrols

Drop-Down Controls for .NET

DropDownControls

Drop-Down Controls for .NET - https://www.brad-smith.info/blog/projects/dropdown-controls

Includes:

• GroupedComboBox - A ComboBox with grouping (group headings only, depth 0-1)
• ComboTreeBox - A ComboBox with a TreeView drop-down (infinite depth, supports node styles, images and checkboxes)
• Custom DataGridView column types - Allows GroupedComboBox and ComboTreeBox to be hosted in the DataGridView control
• DropDownSearchBox - A ComboBox with inline searching (search within the local list items or an external data source)

Requirements:

• .NET Framework 4.8 or .NET 6.0

dropdowncontrols's Issues

Tooltips lingering after dropdown closed

While playing around with the demo app I found that sometimes the tooltips from the ComboTreeBox still remain visible or even new ones appearing after the dropdown has been closed.

All of this on Windows 10 B1903.

I've been able to reproduce the behavior mostly when opening the ComboTreeBox (Images) and hovering over one of the tree nodes, say Hydrogen. When the tooltip has appeared, the current node cannot be selected (I guess the mouse click lands on the tooltip) unless I move the mouse.
Without clicking, the tooltip follows the mouse with a short delay, but when you click on a node while the tooltip still is at the old position, it will be repositioned (and stay visible) even though the dropdown has been closed meanwhile.

GroupedComboBox not grouping in VB

Hello.

I have added devmaestro1's project fork to a test project. I'm using VB .NET Framework 4.8. I can add the controls from the designer although the groups in the grouped combo box don't seem to be working. I've taken a look at the demo's and they're all in C# so I'm just a little unsure if something has gotten lost in translation. Thank you!

Dim groupedItems = New Object() {New With {.Group = "Group 1", .Value = 1, .Display = "Test", .ToolTip = "More info 1"},
    New With {.Group = "Group 1", .Value = 2, .Display = "Test 2", .ToolTip = "More info 2"},
    New With {.Group = "Group 2", .Value = 3, .Display = "Test 3", .ToolTip = "More info 3"}}

GroupedComboBox1.ValueMember = "Value"
GroupedComboBox1.DisplayMember = "Display"
GroupedComboBox1.GroupMember = "Group"

GroupedComboBox1.DataSource = New BindingSource(groupedItems, String.Empty)

Produces:

GroupedComboBox loses its DisplayMember property when changing Datasource

(Using WinForms and .NET Framework 4.8)

I have a form with a number of controls on it, one of which is a DataGridView whose DataSource is linked to a BindingSource. The other controls on the form (mainly textboxes) are bound to the properties of that data-bound item. The form is used essentially for other people to update database records.

However, the GroupedComboBox is used on the form for the user to update an associated item from a linked table. When a new record in the DataGridView is selected, some code runs when BindingSource.OnCurrentChanged is fired on that grid, to re-populate the GroupedComboBox so that it's relevant to the new data-bound item.

However, after assigning a new List / BindingList to GroupedComboBox.DataSource property, somehow the GroupedComboBox.DisplayMember property is then set to an empty string, to which when the framework calls .ToString() on paint, it displays the namespaced object name, rather than the property assigned to DisplayMember.

In debugging, I've added an event listener to GroupedComboBox.OnDataSourceChanged and tried to set the DisplayMember manually, but after stepping over the code, GroupedComboBox.DisplayMember is still an empty string.

GroupedComboBox.ValueMember and GroupedComboBox.GroupMember however are still assigned as from the Designer.

Not sure what's going on.

DropDownSearchBox does not show tree lines even when ShowGlyphs is true

Looks like there is some hard-coding to disallow display of tree-lines in the drop-down search mode (DropDownSearchBox).

Drop-down selection cannot be made when tool-tip appears

Reproduce steps:

1. When pulling down the drop-down tree, linger over the item so the tool-tip appears.
2. Then, try to click the item, it won't select the item. This is because the tool-tip seems to be stealing the 'MouseClick' event.

Plans to port to .NET Core?

Hi Brad,

Any plans to port this to .NET Core 3.1?

Thanks!

Unable to alter selection in ComboTreeBoxCell if column's UseNodeNamesForPath is set to true

If I have UseNodeNamesForPath set to true, I'm unable to edit any ComboTreeBoxCell values.

The issue appears to be within the InitializeEditingControl function within ComboTreeBoxCell, but I'm unable to figure out where exactly yet.

Select/Unselect All for ComboTreeBox

Idea for ComboTreeBox

Prevent group title selection

The control currently allows for the selection of a group title. It would be helpful if an option was added to prevent this.