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https://github.com/WiiDatabase/nusdownloader.git
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123 lines
4.6 KiB
C#
123 lines
4.6 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Windows.Forms;
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using System.Drawing;
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namespace wmgCMS
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{
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class WaterMarkTextBox : TextBox
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{
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private Font oldFont = null;
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private Boolean waterMarkTextEnabled = false;
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#region Attributes
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private Color _waterMarkColor = Color.Gray;
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public Color WaterMarkColor
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{
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get { return _waterMarkColor; }
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set { _waterMarkColor = value; Invalidate();/*thanks to Bernhard Elbl for Invalidate()*/ }
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}
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private string _waterMarkText = "Water Mark";
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public string WaterMarkText
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{
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get { return _waterMarkText; }
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set { _waterMarkText = value; Invalidate(); }
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}
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#endregion
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//Default constructor
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public WaterMarkTextBox()
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{
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JoinEvents(true);
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}
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//Override OnCreateControl ... thanks to "lpgray .. codeproject guy"
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protected override void OnCreateControl()
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{
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base.OnCreateControl();
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//WaterMark_Toggel(null, null);
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EnableWaterMark();
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}
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//Override OnPaint
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protected override void OnPaint(PaintEventArgs args)
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{
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// Use the same font that was defined in base class
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System.Drawing.Font drawFont = new System.Drawing.Font(Font.FontFamily, Font.Size, Font.Style, Font.Unit);
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//Create new brush with gray color or
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SolidBrush drawBrush = new SolidBrush(WaterMarkColor);//use Water mark color
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//Draw Text or WaterMark
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float xpoint = ((float)args.ClipRectangle.Width / 2.0F) - ((float)TextRenderer.MeasureText(WaterMarkText, Font).Width / 2.0F);
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;
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PointF centeredtext = new PointF(xpoint, 0.0F);
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args.Graphics.DrawString((waterMarkTextEnabled ? WaterMarkText : Text), drawFont, drawBrush, centeredtext);
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base.OnPaint(args);
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}
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private void JoinEvents(Boolean join)
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{
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if (join)
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{
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this.TextChanged += new System.EventHandler(this.WaterMark_Toggel);
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this.LostFocus += new System.EventHandler(this.WaterMark_Toggel);
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this.GotFocus += new System.EventHandler(this.WaterMark_Toggel);
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this.MouseCaptureChanged += new System.EventHandler(this.WaterMark_Toggel);
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this.FontChanged += new System.EventHandler(this.WaterMark_FontChanged);
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//No one of the above events will start immeddiatlly
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//TextBox control still in constructing, so,
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//Font object (for example) couldn't be catched from within WaterMark_Toggle
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//So, call WaterMark_Toggel through OnCreateControl after TextBox is totally created
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//No doupt, it will be only one time call
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//Old solution uses Timer.Tick event to check Create property
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}
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}
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private void WaterMark_Toggel(object sender, EventArgs args)
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{
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/*if (this.Text.Length <= 0)
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EnableWaterMark();
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else
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DisbaleWaterMark(); */
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if (this.Text.Length > 0)
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{
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System.Diagnostics.Debug.WriteLine(sender.ToString() + " disabled watermark");
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DisbaleWaterMark();
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}
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}
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private void EnableWaterMark()
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{
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//Save current font until returning the UserPaint style to false (NOTE: It is a try and error advice)
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oldFont = new System.Drawing.Font(Font.FontFamily, Font.Size, Font.Style, Font.Unit);
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//Enable OnPaint event handler
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this.SetStyle(ControlStyles.UserPaint, true);
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this.waterMarkTextEnabled = true;
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//Triger OnPaint immediatly
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Refresh();
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}
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private void DisbaleWaterMark()
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{
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//Disbale OnPaint event handler
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this.waterMarkTextEnabled = false;
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this.SetStyle(ControlStyles.UserPaint, false);
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//Return back oldFont if existed
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if (oldFont != null)
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this.Font = new System.Drawing.Font(oldFont.FontFamily, oldFont.Size, oldFont.Style, oldFont.Unit);
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}
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private void WaterMark_FontChanged(object sender, EventArgs args)
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{
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if (waterMarkTextEnabled)
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{
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oldFont = new System.Drawing.Font(Font.FontFamily, Font.Size, Font.Style, Font.Unit);
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Refresh();
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}
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}
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}
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}
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