Playing with winforms textbox border color.
This is a small hack class that adds a set color for input area borders (textbox, richtextbox, combos, etc.) Here is the result:
Screenshot
It all holds up in a single file:
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/// <summary>
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/// This class adds border to input elements similar to Chrome
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/// </summary>
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public class FormBorderizer
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{
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/** PRIVATE MEMBERS **/
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private Label m_lblBorder; // label used for borders
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private static Color BORDER_COLOR = Color.Gold; // Border color
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private static int BORDER_WIDTH = 2; // Border width
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private static Color BACK_COLOR = Color.AliceBlue; // Back color
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/** CONTRUCTORS **/
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/// <summary>
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/// Constructor, adds borders to input areas
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/// </summary>
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/// <param name="Control.ControlCollection">collection of controls to parse</param>
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public FormBorderizer(Control.ControlCollection controlCollection)
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{
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InitializeBorder(controlCollection);
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AddBorder(controlCollection);
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}
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/** METHODS **/
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/// <summary>
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/// Initializes the border control
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/// </summary>
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/// <param name="controlCollection">collection</param>
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private void InitializeBorder(Control.ControlCollection controlCollection)
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{
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m_lblBorder = new Label();
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m_lblBorder.BackColor = Color.Gold;
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m_lblBorder.Visible = false;
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controlCollection.Add(m_lblBorder);
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m_lblBorder.SendToBack();
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}
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/// <summary>
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/// Adds a colored border to a collection of controls
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/// </summary>
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/// <param name="controlCollection">target collection</param>
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private void AddBorder(Control.ControlCollection controlCollection)
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{
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foreach (Control c in controlCollection)
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{
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// generate event handlers for input areas
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if (IsInputControl(c))
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{
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c.Enter += new EventHandler(c_Enter);
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c.Leave += new EventHandler(c_Leave);
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}
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else if (c is Panel)
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{
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new FormBorderizer(c.Controls);
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}
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else if (c is TabControl)
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{
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TabControl tc = (TabControl)c;
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foreach (TabPage tp in tc.TabPages)
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{
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new FormBorderizer(tp.Controls);
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}
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}
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}
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}
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/// <summary>
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/// Checks whether this control should hold a border or not
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/// </summary>
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/// <param name="c">target control</param>
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/// <returns>true or false</returns>
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private bool IsInputControl(Control c)
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{
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return (c is TextBox || c is ListBox || c is ComboBox || c is RichTextBox || c is MaskedTextBox);
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}
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/** EVENTS **/
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/// <summary>
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/// Event occuring when the user leaves an input control
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/// </summary>
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private void c_Leave(object sender, EventArgs e)
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{
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m_lblBorder.Visible = false;
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Control ctrl = (Control)sender;
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ctrl.BackColor = Color.White;
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}
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/// <summary>
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/// Event occuring when the user enters an input control
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/// </summary>
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private void c_Enter(object sender, EventArgs e)
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{
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Control ctrl = (Control)sender;
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WrapControl(ctrl);
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m_lblBorder.Visible = true;
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m_lblBorder.Anchor = ctrl.Anchor;
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}
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/// <summary>
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/// Wraps the border around the control
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/// </summary>
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/// <param name="control"></param>
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private void WrapControl(Control control)
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{
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m_lblBorder.Top = control.Top - BORDER_WIDTH;
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m_lblBorder.Left = control.Left - BORDER_WIDTH;
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m_lblBorder.Width = control.Width + 2 * BORDER_WIDTH;
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m_lblBorder.Height = control.Height + 2 * BORDER_WIDTH;
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control.BackColor = BACK_COLOR;
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}
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}
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To call it, simply create an instance of FormBorderizer (such an awful name!!) and initialize it with a form / panel control collection.
Ex:
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public partial class Form1 : Form
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{
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public Form1()
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{
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InitializeComponent();
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new FormBorderizer(this.Controls);
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}
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}
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(