/// <summary>
/// Returns true if any part of the client based rectangle is visible.
/// </summary>
/// <param name="control">Control to check.</param>
/// <param name="rectangleToCheck">Client based rectangle to check.</param>
public static bool IsClientRectangleVisible( Control control, Rectangle rectangleToCheck )
{
if( !control.IsHandleCreated )
{
return false;
}
Utility.Win32.Common.RECT rcClip, rcClient = new Utility.Win32.Common.RECT( rectangleToCheck );
using( Graphics grfx = control.CreateGraphics() )
{
IntPtr hdc = IntPtr.Zero;
try
{
hdc = grfx.GetHdc();
RegionValue result = (RegionValue) Gdi.GetClipBox( hdc, out rcClip );
return result != RegionValue.NULLREGION;
}
finally
{
if( hdc != IntPtr.Zero )
{
grfx.ReleaseHdc( hdc );
}
}
}
}
/// <summary>
/// Returns true if any part of the client based rectangle is visible.
/// </summary>
/// <param name="control">Control to check.</param>
/// <param name="rectangleToCheck">Client based rectangle to check.</param>
public static bool IsClientRectangleVisible(Control control, Rectangle rectangleToCheck)
{
if (!control.IsHandleCreated)
{
return(false);
}
Utility.Win32.Common.RECT rcClip, rcClient = new Utility.Win32.Common.RECT(rectangleToCheck);
using (Graphics grfx = control.CreateGraphics())
{
IntPtr hdc = IntPtr.Zero;
try
{
hdc = grfx.GetHdc();
RegionValue result = (RegionValue)Gdi.GetClipBox(hdc, out rcClip);
return(result != RegionValue.NULLREGION);
}
finally
{
if (hdc != IntPtr.Zero)
{
grfx.ReleaseHdc(hdc);
}
}
}
}
public static Size MeasureString( Graphics g, string text, Font font, int width )
{
Size size;
TextDetails td = new TextDetails( text, font, width );
if( _mapTextSizes.TryGetValue( td, out size ) )
{
return size;
}
IntPtr hDC = g.GetHdc();
try
{
IntPtr hFont = font.ToHfont();
try
{
IntPtr hOldFont = Gdi.SelectObject( hDC, hFont );
try
{
Rectangle rect = new Rectangle( 0, 0, width, 0 );
Utility.Win32.Common.RECT r = new Utility.Win32.Common.RECT( rect );
Utility.Win32.User.DrawTextFlags uFormat = Utility.Win32.User.DrawTextFlags.DT_WORDBREAK | Utility.Win32.User.DrawTextFlags.DT_CALCRECT;
Utility.Win32.User.DrawText( hDC, text, text.Length, ref r, uFormat );
size = new Size( r.Right, r.Bottom );
_mapTextSizes[td] = size;
return size;
}
finally
{
Gdi.SelectObject( hDC, hOldFont );
}
}
finally
{
Gdi.DeleteObject( hFont );
}
}
finally
{
g.ReleaseHdc( hDC );
}
}
