/// <summary>
/// Displays a <see cref="CustomColorDialog"/> in front of the specified WPF <see
/// cref="WpfWindow"/> and with the specified WPF color initially selected.</summary>
/// <param name="owner">
/// A WPF <see cref="WpfWindow"/> indicating the parent window of the dialog.</param>
/// <param name="color"><para>
/// The initially selected <see cref="WpfColor"/>. <see cref="WpfColors.Transparent"/>
/// translates to <see cref="WpfColors.Black"/>.
/// </para><para>
/// On return, contains the current color selection if the dialog was dismissed by clicking
/// <b>OK</b>; otherwise unchanged.</para></param>
/// <returns>
/// <c>true</c> if the <see cref="CustomColorDialog"/> was dismissed with a <see
/// cref="DialogResult"/> of <see cref="DialogResult.OK"/>; otherwise, <c>false</c>.
/// </returns>
/// <remarks><para>
/// If the <see cref="CustomColorDialog"/> was dismissed by clicking <b>OK</b>, <b>Show</b>
/// stores the current color selection in the <paramref name="color"/> argument.
/// </para><para>
/// The current set of <see cref="ColorDialog.CustomColors"/> is stored in the static <see
/// cref="CustomColorSet"/> property so that it can be restored when the next instance of
/// the <b>CustomColorDialog</b> class is created.</para></remarks>
public static bool Show(WpfWindow owner, ref WpfColor color)
{
using (CustomColorDialog dialog = new CustomColorDialog(color.ToGdiColor())) {
DialogResult result = dialog.ShowDialog(new HwndWrapper(owner));
// retrieve selected and custom colors on OK
if (result == DialogResult.OK)
{
color = dialog.Color.ToWpfColor();
CustomColorDialog.CustomColorSet = dialog.CustomColors;
}
return(result == DialogResult.OK);
}
}
internal static Brush GetPreviewBrush(BrushEffect effect, System.Windows.Media.Color color, ref SizeF previewRegion)
{
switch (effect)
{
case BrushEffect.Solid:
return(new SolidBrush(color.ToGdiColor()));
case BrushEffect.ToBottom:
return(new LinearGradientBrush(new PointF(0, 0), new PointF(0, previewRegion.Height), Color.Transparent, color.ToGdiColor()));
case BrushEffect.ToTop:
return(new LinearGradientBrush(new PointF(0, previewRegion.Height), new PointF(0, 0), Color.Transparent, color.ToGdiColor()));
case BrushEffect.ToRight:
return(new LinearGradientBrush(new PointF(0, 0), new PointF(previewRegion.Width, 0), Color.Transparent, color.ToGdiColor()));
case BrushEffect.ToLeft:
return(new LinearGradientBrush(new PointF(previewRegion.Width, 0), new PointF(0, 0), Color.Transparent, color.ToGdiColor()));
default:
goto case BrushEffect.Solid;
}
}
