/*
The MIT License

Copyright (c) 2009-2010. Carlos Guzmán Álvarez. http://chronoswpf.codeplex.com/

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace Chronos.Extensions.Windows
{
    /// <summary>
    /// Extension methods for the System.Windows.UIElement class
    /// </summary>
    public static class UIElementExtensions
    {
        #region · Extensions ·

        /// <summary>
        /// Gets the parent of an <see cref="UIElement"/>.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="element">The element.</param>
        /// <returns></returns>
        public static T GetParent<T>(this UIElement element) where T : UIElement
        {
            // Walk the VisualTree to obtain the DesktopItem of the DragThumb
            DependencyObject parent = VisualTreeHelper.GetParent(element);

            while (parent != null && !(parent is T))
            {
                parent = VisualTreeHelper.GetParent(parent);
            }

            return parent as T;
        }

        /// <summary>
        /// Renders the ui element into a bitmap frame.
        /// </summary>
        /// <param name="element">The UI element.</param>
        /// <returns>The created bitmap frame</returns>
        public static BitmapSource RenderToBitmap(this UIElement element)
        {
            return element.RenderToBitmap(1);
        }

        /// <summary>
        /// Renders the ui element into a bitmap frame using the specified scale.
        /// </summary>
        /// <param name="element">The UI element.</param>
        /// <param name="scale">The scale (default: 1).</param>
        /// <returns>The created bitmap frame</returns>
        public static BitmapSource RenderToBitmap(this UIElement element, double scale)
        {
            var renderWidth     = (int)(element.RenderSize.Width * scale);
            var renderHeight    = (int)(element.RenderSize.Height * scale);

            var renderTarget    = new RenderTargetBitmap(renderWidth, renderHeight, 96, 96, PixelFormats.Pbgra32);
            var sourceBrush     = new VisualBrush(element);

            var drawingVisual   = new DrawingVisual();
            var drawingContext  = drawingVisual.RenderOpen();

            using (drawingContext)
            {
                drawingContext.PushTransform(new ScaleTransform(scale, scale));
                drawingContext.DrawRectangle(sourceBrush, null, new Rect(new Point(0, 0), new Point(element.RenderSize.Width, element.RenderSize.Height)));
            }

            renderTarget.Render(drawingVisual);

            return renderTarget;
        }

        #endregion
    }
}