SizeF sf_font = g.MeasureString(\, this.Font); g.Dispose();
return (int)sf_font.Height; }
private void GetBitmaps() {
if (myBitmap == null
|| myAlphaBitmap == null || myBitmap.Width != Width || myBitmap.Height != Height || myAlphaBitmap.Width != Width || myAlphaBitmap.Height != Height) {
myBitmap = null;
myAlphaBitmap = null; }
if (myBitmap == null) {
myBitmap = new Bitmap(this.ClientRectangle.Width, this.ClientRectangle.Height);//(Width,Height); myUpToDate = false; }
if (!myUpToDate) {
//Capture the TextBox control window
this.SetStyle(ControlStyles.UserPaint, false);
win32.CaptureWindow(this, ref myBitmap);
this.SetStyle(ControlStyles.UserPaint, true);
this.SetStyle(ControlStyles.SupportsTransparentBackColor, true); this.BackColor = Color.FromArgb(myBackAlpha, myBackColor);
} //--
Rectangle r2 = new Rectangle(0, 0, this.ClientRectangle.Width, this.ClientRectangle.Height); ImageAttributes tempImageAttr = new ImageAttributes();
//Found the color map code in the MS Help
ColorMap[] tempColorMap = new ColorMap[1]; tempColorMap[0] = new ColorMap();
tempColorMap[0].OldColor = Color.FromArgb(255, myBackColor);
tempColorMap[0].NewColor = Color.FromArgb(myBackAlpha, myBackColor);
tempImageAttr.SetRemapTable(tempColorMap);
if (myAlphaBitmap != null) myAlphaBitmap.Dispose();
myAlphaBitmap = new Bitmap(this.ClientRectangle.Width, this.ClientRectangle.Height);//(Width,Height);
Graphics tempGraphics1 = Graphics.FromImage(myAlphaBitmap);
tempGraphics1.DrawImage(myBitmap, r2, 0, 0, this.ClientRectangle.Width, this.ClientRectangle.Height, GraphicsUnit.Pixel, tempImageAttr);
tempGraphics1.Dispose();
//----
if (this.Focused && (this.SelectionLength == 0)) {
Graphics tempGraphics2 = Graphics.FromImage(myAlphaBitmap); if (myCaretState) {
//Draw the caret
Point caret = this.findCaret();
Pen p = new Pen(this.ForeColor, 3);
tempGraphics2.DrawLine(p, caret.X, caret.Y + 0, caret.X, caret.Y + myFontHeight); tempGraphics2.Dispose(); }
}
}
private Point findCaret() {
/* Find the caret translated from code at
* http://www.vb-helper.com/howto_track_textbox_caret.html * * and *
* http://www.microbion.co.uk/developers/csharp/textpos2.htm *
* Changed to EM_POSFROMCHAR *
* This code still needs to be cleaned up and debugged * */
Point pointCaret = new Point(0); int i_char_loc = this.SelectionStart;
IntPtr pi_char_loc = new IntPtr(i_char_loc);
int i_point = win32.SendMessage(this.Handle, win32.EM_POSFROMCHAR, pi_char_loc, IntPtr.Zero); pointCaret = new Point(i_point);
if (i_char_loc == 0) {
pointCaret = new Point(0); }
else if (i_char_loc >= this.Text.Length) {
pi_char_loc = new IntPtr(i_char_loc - 1);
i_point = win32.SendMessage(this.Handle, win32.EM_POSFROMCHAR, pi_char_loc, IntPtr.Zero); pointCaret = new Point(i_point);
Graphics g = this.CreateGraphics();
String t1 = this.Text.Substring(this.Text.Length - 1, 1) + \; SizeF sizet1 = g.MeasureString(t1, this.Font); SizeF sizex = g.MeasureString(\, this.Font); g.Dispose();
int xoffset = (int)(sizet1.Width - sizex.Width); pointCaret.X = pointCaret.X + xoffset;
if (i_char_loc == this.Text.Length)
{
String slast = this.Text.Substring(Text.Length - 1, 1); if (slast == \) {
pointCaret.X = 1;
pointCaret.Y = pointCaret.Y + myFontHeight; } }
}
return pointCaret; }
private void myTimer1_Tick(object sender, EventArgs e) {
//Timer used to turn caret on and off for focused control
myCaretState = !myCaretState; myCaretUpToDate = false; this.Invalidate(); }
private class uPictureBox : PictureBox {
public uPictureBox() {
this.SetStyle(ControlStyles.Selectable, false); this.SetStyle(ControlStyles.UserPaint, true);
this.SetStyle(ControlStyles.AllPaintingInWmPaint, true); this.SetStyle(ControlStyles.DoubleBuffer, true);
this.Cursor = null; this.Enabled = true;
this.SizeMode = PictureBoxSizeMode.Normal;
}
//uPictureBox
protected override void WndProc(ref Message m) {
if (m.Msg == win32.WM_LBUTTONDOWN || m.Msg == win32.WM_RBUTTONDOWN || m.Msg == win32.WM_LBUTTONDBLCLK || m.Msg == win32.WM_MOUSELEAVE || m.Msg == win32.WM_MOUSEMOVE) {
//Send the above messages back to the parent control
win32.PostMessage(this.Parent.Handle, (uint)m.Msg, m.WParam, m.LParam); }
else if (m.Msg == win32.WM_LBUTTONUP) {
//?? for selects and such this.Parent.Invalidate(); }
base.WndProc(ref m); }
} // End uPictureBox Class
#endregion // end private functions and classes
#region Component Designer generated code ///
/// Required method for Designer support - do not modify /// the contents of this method with the code editor. ///
private void InitializeComponent() {
components = new System.ComponentModel.Container(); }
#endregion
#region New Public Properties
[
Category(\),
Description(\), Browsable(true),
DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)
]
public int BackAlpha {
get { return myBackAlpha; } set {
int v = value; if (v > 255) v = 255;
myBackAlpha = v; myUpToDate = false; Invalidate(); } }
#endregion
} // End AlphaTextBox Class
} // End namespace ZBobb //----
个性签名：做要做好，做到不三不四不如不做。