Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / Padding.cs / 1 / Padding.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using System; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design; using System.ComponentModel.Design.Serialization; using System.Diagnostics; using System.Diagnostics.CodeAnalysis; using System.Drawing; using System.Globalization; ///[TypeConverterAttribute(typeof(PaddingConverter))] [Serializable] public struct Padding { private bool _all; private int _top; private int _left; private int _right; private int _bottom; /// public static readonly Padding Empty = new Padding(0); /// public Padding(int all) { _all = true; _top = _left = _right = _bottom = all; Debug_SanityCheck(); } /// public Padding(int left, int top, int right, int bottom) { _top = top; _left = left; _right = right; _bottom = bottom; _all = _top == _left && _top == _right && _top == _bottom; Debug_SanityCheck(); } /// [RefreshProperties(RefreshProperties.All)] public int All { get { return _all ? _top : -1; } set { if (_all != true || _top != value) { _all = true; _top = _left = _right = _bottom = value; } Debug_SanityCheck(); } } /// [RefreshProperties(RefreshProperties.All)] public int Bottom { get { if (_all) { return _top; } return _bottom; } set { if (_all || _bottom != value) { _all = false; _bottom = value; } Debug_SanityCheck(); } } /// [RefreshProperties(RefreshProperties.All)] public int Left { get { if (_all) { return _top; } return _left; } set { if (_all || _left != value) { _all = false; _left = value; } Debug_SanityCheck(); } } /// [RefreshProperties(RefreshProperties.All)] public int Right { get { if (_all) { return _top; } return _right; } set { if (_all || _right != value) { _all = false; _right = value; } Debug_SanityCheck(); } } /// [RefreshProperties(RefreshProperties.All)] public int Top { get { return _top; } set { if (_all || _top != value) { _all = false; _top = value; } Debug_SanityCheck(); } } /// [Browsable(false)] public int Horizontal { get { return Left + Right; } } /// [Browsable(false)] public int Vertical { get { return Top + Bottom; } } /// [Browsable(false)] public Size Size { get { return new Size(Horizontal, Vertical); } } public static Padding Add(Padding p1, Padding p2) { // added for FXCop rule: Provide a friendly-name version of the Addition operator return p1 + p2; } public static Padding Subtract(Padding p1, Padding p2) { // added for FXCop rule: Provide a friendly-name version of the Subtraction operator return p1 - p2; } /// public override bool Equals(object other) { if(other is Padding) { return ((Padding)other) == this; } return false; } /// /// /// public static Padding operator +(Padding p1, Padding p2) { return new Padding(p1.Left + p2.Left, p1.Top + p2.Top, p1.Right + p2.Right, p1.Bottom + p2.Bottom ); } ////// Performs vector addition of two ///objects. /// /// /// public static Padding operator -(Padding p1, Padding p2) { return new Padding(p1.Left - p2.Left, p1.Top - p2.Top, p1.Right - p2.Right, p1.Bottom - p2.Bottom ); } ////// Contracts a ///by another /// . /// /// /// Tests whether two public static bool operator ==(Padding p1, Padding p2) { return p1.Left == p2.Left && p1.Top == p2.Top && p1.Right == p2.Right && p1.Bottom == p2.Bottom; } ///objects /// are identical. /// /// /// public static bool operator !=(Padding p1, Padding p2) { return !(p1 == p2); } ////// Tests whether two ///objects are different. /// public override int GetHashCode() { // VSWhidbey #130081: Padding class should implement GetHashCode for perf return Left ^ WindowsFormsUtils.RotateLeft(Top, 8) ^ WindowsFormsUtils.RotateLeft(Right, 16) ^ WindowsFormsUtils.RotateLeft(Bottom, 24); } /// public override string ToString() { return "{Left=" + Left.ToString(CultureInfo.CurrentCulture) + ",Top=" + Top.ToString(CultureInfo.CurrentCulture) + ",Right=" + Right.ToString(CultureInfo.CurrentCulture) + ",Bottom=" + Bottom.ToString(CultureInfo.CurrentCulture) + "}"; } private void ResetAll() { All = 0; } private void ResetBottom() { Bottom = 0; } private void ResetLeft() { Left = 0; } private void ResetRight() { Right = 0; } private void ResetTop() { Top = 0; } internal void Scale(float dx, float dy) { _top = (int)((float)_top * dy); _left = (int)((float)_left * dx); _right = (int)((float)_right * dx); _bottom = (int)((float)_bottom * dy); } internal bool ShouldSerializeAll() { return _all; } [Conditional("DEBUG")] private void Debug_SanityCheck() { if(_all) { Debug.Assert(ShouldSerializeAll(), "_all is true, but ShouldSerializeAll() is false."); Debug.Assert(All == Left && Left == Top && Top == Right && Right == Bottom, "_all is true, but All/Left/Top/Right/Bottom inconsistent."); } else { Debug.Assert(All == -1, "_all is false, but All != -1."); Debug.Assert(!ShouldSerializeAll(), "ShouldSerializeAll() should not be true when all flag is not set."); // The below assert is not true with the current implementation of DockPaddingEdges. // Debug.Assert(Left != Top || Top != Right || Right != Bottom, "_all is not set, but Left/Top/Right/Bottom are all the same"); } } } public class PaddingConverter : TypeConverter { /// /// Determines if this converter can convert an object in the given source /// type to the native type of the converter. /// public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { if (sourceType == typeof(string)) { return true; } return base.CanConvertFrom(context, sourceType); } public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if (destinationType == typeof(InstanceDescriptor)) { return true; } return base.CanConvertTo(context, destinationType); } ////// Converts the given object to the converter's native type. /// [ SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes") // ConvertFromString returns an object ] public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { string valueStr = value as string; if (valueStr != null) { valueStr = valueStr.Trim(); if (valueStr.Length == 0) { return null; } else { // Parse 4 integer values. if (culture == null) { culture = CultureInfo.CurrentCulture; } char sep = culture.TextInfo.ListSeparator[0]; string[] tokens = valueStr.Split(new char[] { sep }); int[] values = new int[tokens.Length]; TypeConverter intConverter = TypeDescriptor.GetConverter(typeof(int)); for (int i = 0; i < values.Length; i++) { // Note: ConvertFromString will raise exception if value cannot be converted. values[i] = (int)intConverter.ConvertFromString(context, culture, tokens[i]); } if (values.Length == 4) { return new Padding(values[0], values[1], values[2], values[3]); } else { throw new ArgumentException(SR.GetString(SR.TextParseFailedFormat, "value", valueStr, "left, top, right, bottom")); } } } return base.ConvertFrom(context, culture, value); } public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (destinationType == null) { throw new ArgumentNullException("destinationType"); } if (value is Padding) { if (destinationType == typeof(string)) { Padding padding = (Padding)value; if (culture == null) { culture = CultureInfo.CurrentCulture; } string sep = culture.TextInfo.ListSeparator + " "; TypeConverter intConverter = TypeDescriptor.GetConverter(typeof(int)); string[] args = new string[4]; int nArg = 0; // Note: ConvertToString will raise exception if value cannot be converted. args[nArg++] = intConverter.ConvertToString(context, culture, padding.Left); args[nArg++] = intConverter.ConvertToString(context, culture, padding.Top); args[nArg++] = intConverter.ConvertToString(context, culture, padding.Right); args[nArg++] = intConverter.ConvertToString(context, culture, padding.Bottom); return string.Join(sep, args); } else if (destinationType == typeof(InstanceDescriptor)) { Padding padding = (Padding) value; if(padding.ShouldSerializeAll()) { return new InstanceDescriptor( typeof(Padding).GetConstructor(new Type[] {typeof(int)}), new object[] {padding.All}); } else { return new InstanceDescriptor( typeof(Padding).GetConstructor(new Type[] {typeof(int), typeof(int), typeof(int), typeof(int)}), new object[] {padding.Left, padding.Top, padding.Right, padding.Bottom}); } } } return base.ConvertTo(context, culture, value, destinationType); } public override object CreateInstance(ITypeDescriptorContext context, IDictionary propertyValues) { if (context == null) { throw new ArgumentNullException("context"); } if (propertyValues == null) { throw new ArgumentNullException("propertyValues"); } Padding original = (Padding) context.PropertyDescriptor.GetValue(context.Instance); int all = (int)propertyValues["All"]; if(original.All != all) { return new Padding(all); } else { return new Padding( (int)propertyValues["Left"], (int)propertyValues["Top"], (int)propertyValues["Right"], (int)propertyValues["Bottom"]); } } public override bool GetCreateInstanceSupported(ITypeDescriptorContext context) { return true; } public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes) { PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(Padding), attributes); return props.Sort(new string[] {"All", "Left", "Top", "Right", "Bottom"}); } public override bool GetPropertiesSupported(ITypeDescriptorContext context) { return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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