/// <summary>
/// Calculates the rectangle needed for rendering the text string.
/// </summary>
/// <param name="control">Control to which the text will be rendered.
/// It's used for getting the device context and setting the initial text bounds
/// (the latter is ignored in the single-line case).</param>
/// <param name="text">Text to be rendered.</param>
/// <param name="font">Font in which the text will be rendered.</param>
/// <param name="bounds">Initial size that should be expanded to fit the text.</param>
/// <param name="dtf">Additional parameters that control rendering of the text.</param>
/// <returns>Size of the text's bounding rectangle.</returns>
public static Size GetTextSize(Control control, string text, Font font, Size bounds, DrawTextFormatFlags dtf)
{
using (Graphics g = control.CreateGraphics())
{
IntPtr hdc = g.GetHdc();
try
{
IntPtr hFont = _fontCache.GetHFont(font);
IntPtr oldFont = Win32Declarations.SelectObject(hdc, hFont);
RECT rc = new RECT(0, 0, bounds.Width, bounds.Height);
Win32Declarations.DrawText(hdc, text, text.Length, ref rc,
dtf | DrawTextFormatFlags.DT_CALCRECT);
int height = rc.bottom - rc.top;
//height += 1;
Size sz = new Size(rc.right - rc.left, height);
Win32Declarations.SelectObject(hdc, oldFont);
return(sz);
}
finally
{
g.ReleaseHdc(hdc);
}
}
}
public int DrawText(Graphics g, string text, Font font, Color color, Rectangle rc, StringFormat format)
{
int height;
RectangleF rcClip = g.ClipBounds;
RECT rect = new RECT(rc.Left, rc.Top, rc.Right, rc.Bottom);
IntPtr hdc = g.GetHdc();
try
{
IntPtr clipRgn = Win32Declarations.CreateRectRgn(0, 0, 0, 0);
if (Win32Declarations.GetClipRgn(hdc, clipRgn) != 1)
{
Win32Declarations.DeleteObject(clipRgn);
clipRgn = IntPtr.Zero;
}
Win32Declarations.IntersectClipRect(hdc, (int)rcClip.Left, (int)rcClip.Top, (int)rcClip.Right, (int)rcClip.Bottom);
IntPtr hFont = _fontCache.GetHFont(font);
IntPtr oldFont = Win32Declarations.SelectObject(hdc, hFont);
int textColor = Win32Declarations.ColorToRGB(color);
int oldColor = Win32Declarations.SetTextColor(hdc, textColor);
BackgroundMode oldMode = Win32Declarations.SetBkMode(hdc, BackgroundMode.TRANSPARENT);
DrawTextFormatFlags flags = 0;
if ((format.FormatFlags & StringFormatFlags.NoWrap) != 0)
{
flags |= DrawTextFormatFlags.DT_SINGLELINE;
}
else
{
flags |= DrawTextFormatFlags.DT_WORDBREAK;
}
if (format.Alignment == StringAlignment.Center)
{
flags |= DrawTextFormatFlags.DT_CENTER;
}
else if (format.Alignment == StringAlignment.Far)
{
flags |= DrawTextFormatFlags.DT_RIGHT;
}
if (format.LineAlignment == StringAlignment.Center)
{
flags |= DrawTextFormatFlags.DT_VCENTER;
}
if (format.Trimming == StringTrimming.EllipsisCharacter)
{
flags |= DrawTextFormatFlags.DT_END_ELLIPSIS;
}
if (format.HotkeyPrefix == HotkeyPrefix.None)
{
flags |= DrawTextFormatFlags.DT_NOPREFIX;
}
height = Win32Declarations.DrawText(hdc, text, text.Length, ref rect, flags);
Win32Declarations.SelectClipRgn(hdc, clipRgn);
Win32Declarations.DeleteObject(clipRgn);
Win32Declarations.SetBkMode(hdc, oldMode);
Win32Declarations.SetTextColor(hdc, oldColor);
Win32Declarations.SelectObject(hdc, oldFont);
}
finally
{
g.ReleaseHdc(hdc);
}
return(height);
}