using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace DevComponents.DotNetBar.Layout
{
    internal static class Helpers
    {
        public static Size Max(Size s1, Size s2)
        {
            return new Size(Math.Max(s1.Width, s2.Width), Math.Max(s1.Height, s2.Height));
        }
        public static Rectangle Deflate(Rectangle r, System.Windows.Forms.Padding padding)
        {
            r.X += padding.Left;
            r.Width -= padding.Horizontal;
            r.Y += padding.Top;
            r.Height -= padding.Vertical;

            return r;
        }
        public static Rectangle Deflate(Rectangle r, DevComponents.DotNetBar.Padding padding)
        {
            r.X += padding.Left;
            r.Width -= padding.Horizontal;
            r.Y += padding.Top;
            r.Height -= padding.Vertical;

            return r;
        }

        public static int GetTextBaseline(Control ctrl, ContentAlignment alignment)
        {
            return GetTextBaseline(ctrl, ctrl.Font, alignment);
        }

        public static int GetTextBaseline(Control ctrl, Font font, ContentAlignment alignment)
        {
            Rectangle clientRect = ctrl.ClientRectangle;
            int ascent = 0;
            int height = 0;
            using (Graphics g = ctrl.CreateGraphics())
            {
                IntPtr hdc = g.GetHdc();
                IntPtr hFont = font.ToHfont();
                try
                {
                    IntPtr oldObject = WinApi.SelectObject(hdc, hFont);
                    WinApi.TEXTMETRIC tm = new WinApi.TEXTMETRIC();
                    WinApi.GetTextMetrics(new HandleRef(ctrl, hdc), tm);
                    ascent = tm.tmAscent + 1;
                    height = tm.tmHeight;
                    WinApi.SelectObject(hdc, oldObject);
                }
                finally
                {
                    WinApi.DeleteObject(hFont);
                    g.ReleaseHdc(hdc);
                }
            }
            if ((alignment & (ContentAlignment.TopRight | ContentAlignment.TopCenter | ContentAlignment.TopLeft)) != (ContentAlignment)0)
            {
                return (clientRect.Top + ascent);
            }
            if ((alignment & (ContentAlignment.MiddleRight | ContentAlignment.MiddleCenter | ContentAlignment.MiddleLeft)) != (ContentAlignment)0)
            {
                return (((clientRect.Top + (clientRect.Height / 2)) - (height / 2)) + ascent);
            }
            return ((clientRect.Bottom - height) + ascent);
        }
        public static bool IsEmpty(System.Windows.Forms.Padding p)
        {
            return p.Left == 0 && p.Right == 0 && p.Top == 0 && p.Bottom == 0;
        }
    }
}