C # construct ColorComboBox

C # construct ColorComboBox

This article mainly introduces c # code sharing for constructing ColorComboBox.

The Code is as follows:

Class ColorComboBox: ComboBox

{

/// <Summary>

/// The selected color

/// </Summary>

Public Color SelectedColor

{

Get {return Color. FromName (this. Text );}

}

/// <Summary>

/// Constructor, build color drop-down list

/// </Summary>

Public ColorComboBox ()

{

This. DrawMode = DrawMode. OwnerDrawFixed;

This. DropDownStyle = ComboBoxStyle. DropDownList;

This. ItemHeight = 25;

 

PropertyInfo [] propInfoList = typeof (Color). GetProperties (BindingFlags. Static | BindingFlags. DeclaredOnly | BindingFlags. Public );

Foreach (PropertyInfo c in propInfoList)

{

This. Items. Add (c. Name );

}

This. Text = "Black"; // sets the default color.

}

 

Protected override void OnDrawItem (DrawItemEventArgs e)

{

Rectangle rect = e. Bounds;

 

If (e. Index> = 0)

{

String colorName = this. Items [e. Index]. ToString ();

Color c = Color. FromName (colorName );

Using (Brush B = new SolidBrush (c) // reserved drop-down Interval

{

E. Graphics. FillRectangle (B, rect. X, rect. Y + 2, rect. Width, rect. Height-4 );

}

}

}