using System;
using System.Windows.Forms;

namespace Eas.Client
{
    /// <summary>
    /// 窗口管理辅助类
    /// </summary>
    public sealed class FormHelper
    {
        private FormHelper()
        {
        }

        /// <summary> 
        /// 获取MDI父窗口是否有窗口标题为指定字符串的子窗口（如果已经存在把此子窗口推向前台） 
        /// </summary> 
        /// <param name="MDIwin">MDI父窗口</param> 
        /// <param name="caption">窗口标题</param> 
        /// <returns></returns> 
        public static bool ExistWin(Form MDIwin, string caption)
        {
            bool R = false;
            foreach (Form f in MDIwin.MdiChildren)
            {
                if (f.Text == caption)
                {
                    R = true;
                    f.Show();
                    f.Activate();
                    break;
                }
            }
            return R;
        }

        /// <summary>
        /// 唯一加载某个类型的窗体，如果存在则显示，否则创建。
        /// </summary>
        /// <param name="mainDialog">主窗体对象</param>
        /// <param name="formType">待显示的窗体类型</param>
        /// <returns></returns>
        public static Form LoadMdiForm(Form mainDialog, Type formType)
        {
            bool bFound = false;
            Form tableForm = null;
            foreach (Form form in mainDialog.MdiChildren)
            {
                if (form.GetType() == formType)
                {
                    bFound = true;
                    tableForm = form;
                    break;
                }
            }
            if (!bFound)
            {
                tableForm = (Form)Activator.CreateInstance(formType);
                tableForm.MdiParent = mainDialog;
                tableForm.Show();
            }

            //tableForm.Dock = DockStyle.Fill;
            //tableForm.WindowState = FormWindowState.Maximized;
            tableForm.BringToFront();
            tableForm.Activate();

            return tableForm;
        }

        /// <summary>
        /// 把控件附加到窗体上弹出
        /// </summary>
        /// <param name="control">待显示的控件</param>
        /// <param name="caption">窗体显示的标题</param>
        public static void PopControlForm(Type control, string caption)
        {
            object ctr = Reflection.CreateInstance(control);
            if ((typeof(Control)).IsAssignableFrom(ctr.GetType()))
            {
                Form tmp = new Form();
                tmp.WindowState = FormWindowState.Maximized;
                tmp.ShowIcon = false;
                tmp.Text = caption;
                tmp.ShowInTaskbar = false;
                tmp.StartPosition = FormStartPosition.CenterScreen;
                Control ctrtmp = ctr as Control;
                ctrtmp.Dock = DockStyle.Fill;
                tmp.Controls.Add(ctrtmp);
                tmp.ShowDialog();
            }
        }

        /// <summary>
        /// 弹出窗体
        /// </summary>
        /// <param name="type">待显示的窗体类型</param>
        public static void PopDialogForm(Type type)
        {
            object form = Reflection.CreateInstance(type);
            if ((typeof(Form)).IsAssignableFrom(form.GetType()))
            {
                Form tmp = form as Form;
                tmp.ShowInTaskbar = false;
                tmp.StartPosition = FormStartPosition.CenterScreen;
                tmp.ShowDialog();
            }
        }
    }
}