//------------------------------------------------------------------------------
// <copyright file="ButtonBase.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>                                                                
//------------------------------------------------------------------------------
 
namespace System.Windows.Forms.ButtonInternal {
    using System;
    using System.Diagnostics;
    using System.Drawing;
    using System.Drawing.Drawing2D;
    using System.Drawing.Imaging;
    using System.Drawing.Text;
    using System.Windows.Forms;
 
    /// <devdoc>
    ///     Common class for RadioButtonBaseAdapter and CheckBoxBaseAdapter
    /// </devdoc>
    internal abstract class CheckableControlBaseAdapter   : ButtonBaseAdapter {
        private const int standardCheckSize = 13;
        private ButtonBaseAdapter buttonAdapter;
 
        internal CheckableControlBaseAdapter(ButtonBase control) : base(control) {}
 
        protected ButtonBaseAdapter ButtonAdapter {
            get {
                if (buttonAdapter == null) {
                    buttonAdapter = CreateButtonAdapter();
                }
                return buttonAdapter;
            }
        }
 
        internal override Size GetPreferredSizeCore(Size proposedSize) {
            if (Appearance == Appearance.Button) {
                return ButtonAdapter.GetPreferredSizeCore(proposedSize);
            }
 
            using (Graphics measurementGraphics = WindowsFormsUtils.CreateMeasurementGraphics()) {
                using (PaintEventArgs pe = new PaintEventArgs(measurementGraphics, new Rectangle())) {
                    LayoutOptions options = Layout(pe);
                    return options.GetPreferredSizeCore(proposedSize);
                }
            }        
        }
        
        protected abstract ButtonBaseAdapter CreateButtonAdapter();
 
        private Appearance Appearance {
            get {
                CheckBox checkBox = Control as CheckBox;
                if(checkBox != null) {
                    return checkBox.Appearance;
                }
 
                RadioButton radioButton = Control as RadioButton;
                if(radioButton != null) {
                    return radioButton.Appearance;
                }
 
                Debug.Fail("Unexpected control type '" + Control.GetType().FullName + "'");
                return Appearance.Normal;
            }
        }
 
        internal override LayoutOptions CommonLayout() {
            LayoutOptions layout = base.CommonLayout();
            layout.growBorderBy1PxWhenDefault = false;
            layout.borderSize        = 0;
            layout.paddingSize       = 0;
            layout.maxFocus          = false;
            layout.focusOddEvenFixup = true;
            layout.checkSize         = standardCheckSize;
            return layout;
        }
 
        internal double GetDpiScaleRatio(Graphics g) {
            return GetDpiScaleRatio(g, Control);
        }
 
        internal static double GetDpiScaleRatio(Graphics g, Control control) {
 
            if (DpiHelper.EnableDpiChangedMessageHandling 
                && control != null && control.IsHandleCreated) {
 
                return control.deviceDpi / DpiHelper.LogicalDpi;
            }
 
            if (g == null)
                return 1.0F;
            return g.DpiX / 96;
        }
 
    }
}