/// <summary><seealso cref="OptimalWidth"/>
/// Calculates the preferred width on a per-tab basis.
/// </summary>
private void CalcPreferredWidth(TabBarTab tab)
{
IntPtr hdc = (IntPtr)0;
try
{
if (IsHandleCreated)
{
hdc = Win32Declarations.GetDC(Handle);
}
else
{
hdc = Win32Declarations.GetDC((IntPtr)0);
}
IntPtr oldFont = Win32Declarations.SelectObject(hdc, _fontHandle);
Win32Declarations.SelectObject(hdc, oldFont);
SIZE sz = new SIZE();
Win32Declarations.GetTextExtentPoint32(hdc, tab.Text, tab.Text.Length, ref sz);
int prefWidth = sz.cx + 2 * 8;
tab.PreferredWidth = Math.Max(50, prefWidth);
tab.Width = tab.PreferredWidth;
}
finally
{
if (hdc != (IntPtr)0)
{
Win32Declarations.ReleaseDC(Handle, hdc);
hdc = (IntPtr)0;
}
}
}
private void ProcessWmNcPaint(ref Message message)
{
// GetDCEx usually returns 0, so just get the windows DC
var hdc = GetDCEx(message.HWnd, message.WParam, DCX_WINDOW | DCX_INTERSECTRGN);
if (hdc == IntPtr.Zero)
{
hdc = GetWindowDC(message.HWnd);
}
try
{
using (var graphics = Graphics.FromHdc(hdc))
{
var windowRectangle = new Rectangle(0, 0, Width, Height);
var clientRectangle = OnCalculateNonClientSize(windowRectangle);
graphics.ExcludeClip(clientRectangle);
OnPaintNonClient(graphics, windowRectangle);
}
}
finally
{
Win32Declarations.ReleaseDC(message.HWnd, hdc);
}
}
public Size MeasureText(string text, Font font)
{
IntPtr hdc = Win32Declarations.GetDC(IntPtr.Zero);
try
{
return(MeasureText(hdc, font, text));
}
finally
{
Win32Declarations.ReleaseDC(IntPtr.Zero, hdc);
}
}
/// <summary>
/// Get the size on the screen HDC
/// </summary>
/// <returns></returns>
public Size GetSize()
{
IntPtr hDC = Win32Declarations.GetDC(IntPtr.Zero);
try
{
return(GetSize(hDC).ToSize());
}
finally
{
Win32Declarations.ReleaseDC(IntPtr.Zero, hDC);
}
}
protected override void WndProc(ref Message m)
{
if (m.Msg == Win32Declarations.WM_NCPAINT && BorderStyle == BorderStyle.FixedSingle)
{
IntPtr hdc = Win32Declarations.GetWindowDC(Handle);
IntPtr brush = Win32Declarations.CreateSolidBrush(Win32Declarations.ColorToRGB(_borderColor));
IntPtr oldBrush = Win32Declarations.SelectObject(hdc, brush);
RECT rect = new RECT(0, 0, Width, Height);
Win32Declarations.FrameRect(hdc, ref rect, brush);
Win32Declarations.SelectObject(hdc, oldBrush);
Win32Declarations.DeleteObject(brush);
Win32Declarations.ReleaseDC(Handle, hdc);
m.Result = IntPtr.Zero;
}
else
{
base.WndProc(ref m);
}
}
