using System;
using System.Drawing;

namespace Dongke.WinForm.Controls.InvoiceLayout
{
    internal partial class ImageItemSetting : Setting
    {
        #region 成员变量
        private string _fileName = string.Empty;    // 图片文件名
        private Image _image;                       // 图片
        private decimal _imageWidth = 1;            // 图片的宽
        private decimal _imageHeight = 1;           // 图片的高
        private decimal _imageSizeRatio = 1;        // 图片的长宽比
        private bool _isImageSizeChanging = false;  // 图片尺寸改变
        private bool _sideRatioFixed = true;        // 图片的长宽比固定
        #endregion 成员变量

        #region 属性
        /// <summary>
        /// 图片X(mm)
        /// </summary>
        public float ImageLocationX
        {
            get
            {
                return System.Convert.ToSingle(numLoctionX.Value);
            }
            set
            {
                decimal d = System.Convert.ToDecimal(value);
                if (d < numLoctionX.Minimum)
                {
                    d = numLoctionX.Minimum;
                }
                else if (numLoctionX.Maximum < d)
                {
                    d = numLoctionX.Maximum;
                }
                numLoctionX.Value = d;
            }
        }

        /// <summary>
        /// 图片Y(mm)
        /// </summary>
        public float ImageLocationY
        {
            get
            {
                return System.Convert.ToSingle(numLoctionY.Value);
            }
            set
            {
                decimal d = System.Convert.ToDecimal(value);
                if (d < numLoctionY.Minimum)
                {
                    d = numLoctionY.Minimum;
                }
                else if (numLoctionY.Maximum < d)
                {
                    d = numLoctionY.Maximum;
                }
                numLoctionY.Value = d;
            }
        }

        /// <summary>
        /// 图片的宽(mm)
        /// </summary>
        public float ImageWidth
        {
            get
            {
                return System.Convert.ToSingle(numWidth.Value);
            }
            set
            {
                decimal d = System.Convert.ToDecimal(value);
                if (d < numWidth.Minimum)
                {
                    d = numWidth.Minimum;
                }
                else if (numWidth.Maximum < d)
                {
                    d = numWidth.Maximum;
                }
                numWidth.Value = d;
            }
        }

        /// <summary>
        /// 图片的高(mm)
        /// </summary>
        public float ImageHeight
        {
            get
            {
                return System.Convert.ToSingle(numHeight.Value);
            }
            set
            {
                decimal d = System.Convert.ToDecimal(value);
                if (d < numHeight.Minimum)
                {
                    d = numHeight.Minimum;
                }
                else if (numHeight.Maximum < d)
                {
                    d = numHeight.Maximum;
                }
                numHeight.Value = d;
            }
        }

        /// <summary>
        /// 图片的长宽比固定
        /// </summary>
        public bool SideRatioFixed
        {
            get
            {
                return chkFixedRatio.Checked;
            }
            set
            {
                _sideRatioFixed = value;
            }
        }

        /// <summary>
        /// 图片名
        /// </summary>
        public string FileName
        {
            get
            {
                return _fileName;
            }
            set
            {
                _fileName = value;
            }
        }

        /// <summary>
        /// 图片
        /// </summary>
        public Image Image
        {
            get
            {
                return _image;
            }
            set
            {
                _image = value;
            }
        }
        #endregion 属性

        #region 构造函数
        /// <summary>
        /// 构造函数
        /// </summary>
        public ImageItemSetting()
        {
            InitializeComponent();
            string directory = Environment.GetFolderPath(Environment.SpecialFolder.MyPictures);
            saveFileDialog.Title = Text;
            saveFileDialog.FileName = _fileName;
            saveFileDialog.Filter = LayoutConsts.FILE_DIALOG_IMAGE_FILTER;
            saveFileDialog.FilterIndex = 6;
            if (System.IO.Directory.Exists(directory))
            {
                saveFileDialog.InitialDirectory = directory;
            }
            else
            {
                saveFileDialog.InitialDirectory =
                    Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
            }
        }
        #endregion 构造函数

        #region 事件处理
        /// <summary>
        /// Shown
        /// </summary>
        /// <param name="sender">指定的对象</param>
        /// <param name="e">提供的事件数据</param>
        private void ImageItemSetting_Shown(object sender, System.EventArgs e)
        {
            chkFixedRatio.Checked = _sideRatioFixed;
        }

        /// <summary>
        /// 宽改变
        /// </summary>
        /// <param name="sender">指定的对象</param>
        /// <param name="e">提供的事件数据</param>
        private void numWidth_ValueChanged(object sender, System.EventArgs e)
        {
            if (!_isImageSizeChanging)
            {
                if (chkFixedRatio.Checked)
                {
                    _isImageSizeChanging = true;
                    _imageHeight = LayoutCommon.Truncate(numWidth.Value * _imageSizeRatio,
                        numWidth.DecimalPlaces);
                    if (_imageHeight < numHeight.Minimum
                        || numHeight.Maximum < _imageHeight)
                    {
                        _imageHeight = numHeight.Value;
                        numWidth.Value = _imageWidth;
                    }
                    else
                    {
                        _imageWidth = numWidth.Value;
                        numHeight.Value = _imageHeight;
                    }
                    _isImageSizeChanging = false;
                }
                else
                {
                    _imageWidth = numWidth.Value;
                }
            }
        }

        /// <summary>
        /// 高改变
        /// </summary>
        /// <param name="sender">指定的对象</param>
        /// <param name="e">提供的事件数据</param>
        private void numHeight_ValueChanged(object sender, System.EventArgs e)
        {
            if (!_isImageSizeChanging)
            {
                if (chkFixedRatio.Checked)
                {
                    _isImageSizeChanging = true;
                    _imageWidth = LayoutCommon.Truncate(numHeight.Value / _imageSizeRatio,
                        numHeight.DecimalPlaces);
                    if (_imageWidth < numWidth.Minimum
                        || numWidth.Maximum < _imageWidth)
                    {
                        _imageWidth = numWidth.Value;
                        numHeight.Value = _imageHeight;
                    }
                    else
                    {
                        numWidth.Value = _imageWidth;
                        _imageHeight = numHeight.Value;
                    }
                    _isImageSizeChanging = false;
                }
                else
                {
                    _imageHeight = numHeight.Value;
                }
            }
        }

        /// <summary>
        /// 长宽比固定
        /// </summary>
        /// <param name="sender">指定的对象</param>
        /// <param name="e">提供的事件数据</param>
        private void chkFixedRatio_CheckedChanged(object sender, System.EventArgs e)
        {
            if (chkFixedRatio.Checked)
            {
                _imageSizeRatio = _imageHeight / _imageWidth;
            }
        }

        /// <summary>
        /// 图片另存为
        /// </summary>
        /// <param name="sender">指定的对象</param>
        /// <param name="e">提供的事件数据</param>
        private void btnSaveAs_Click(object sender, EventArgs e)
        {
            if (_image == null)
            {
                return;
            }

            saveFileDialog.FileName = _fileName;
            if (saveFileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                using (Image image = (Image)_image.Clone())
                {
                    image.Save(saveFileDialog.FileName);
                }
            }
        }
        #endregion 事件处理
    }
}