LabelDesigner.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WinForms / System / WinForms / Design / LabelDesigner.cs / 1 / LabelDesigner.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 

[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode", Scope="member", Target="System.Windows.Forms.Design.LabelDesigner..ctor()")] 

namespace System.Windows.Forms.Design {
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.ComponentModel.Design; 
    using System.Design; 
    using System.Drawing;
    using System.Runtime.InteropServices; 
    using System.Windows.Forms.Design.Behavior;
    using System.Windows.Forms;
    using System.Diagnostics;
    using System.Reflection; 

    ///  
    ///  
    ///    
    ///       Provides a designer that can design components 
    ///       that extend TextBoxBase.
    /// 
    internal class LabelDesigner : ControlDesigner {
 
        public LabelDesigner() {
            AutoResizeHandles = true; 
        } 

        ///  
        /// 
        ///     Adds a baseline SnapLine to the list of SnapLines related
        ///     to this control.
        ///  
        public override IList SnapLines {
            [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes")] 
            get { 
                ArrayList snapLines = base.SnapLines as ArrayList;
                ContentAlignment alignment = ContentAlignment.TopLeft; 

                PropertyDescriptor prop;
                PropertyDescriptorCollection props = TypeDescriptor.GetProperties(Component);
 
                if ((prop = props["TextAlign"]) != null) {
                    alignment = (ContentAlignment)prop.GetValue(Component); 
                } 

                //a single text-baseline for the label (and linklabel) control 
                int baseline = DesignerUtils.GetTextBaseline(Control, alignment);

                if ((prop = props["AutoSize"]) != null) {
                    if ((bool)prop.GetValue(Component) == false) { 
                        //Only adjust if AutoSize is false
                        BorderStyle borderStyle = BorderStyle.None; 
                        if ((prop = props["BorderStyle"]) != null) { 
                            borderStyle = (BorderStyle)prop.GetValue(Component);
                        } 
                        baseline += LabelBaselineOffset(alignment, borderStyle);
                    }
                }
 
                snapLines.Add(new SnapLine(SnapLineType.Baseline, baseline, SnapLinePriority.Medium));
 
                // VSWhidbey# 414468 
                Label label = Control as Label;
                if (label != null && label.BorderStyle == BorderStyle.None) { 
                    Type type = Type.GetType("System.Windows.Forms.Label");
                    if (type != null) {
                        MethodInfo info = type.GetMethod("GetLeadingTextPaddingFromTextFormatFlags", BindingFlags.Instance | BindingFlags.NonPublic);
                        if (info != null) { 
                            int offset = (int)info.Invoke(Component, null);
                            bool rtl = (label.RightToLeft == RightToLeft.Yes); 
 
                            for(int i = 0; i < snapLines.Count; i++) {
                                // remove previous padding snaplines 
                                SnapLine snapLine = snapLines[i] as SnapLine;
                                if(snapLine != null && snapLine.SnapLineType == (rtl ? SnapLineType.Right : SnapLineType.Left)) {
                                    snapLine.AdjustOffset(rtl ? -offset : offset);
                                    break; 
                                }
                            } 
 
                        }
                        else { 
                            Debug.Fail("Who removed GetLeadingTextPaddingFromTextFormatFlags from Label?");
                        }
                    }
                } 

                return snapLines; 
            } 
        }
 
        private int LabelBaselineOffset(ContentAlignment alignment, BorderStyle borderStyle) {
            if (((alignment & DesignerUtils.anyMiddleAlignment) != 0) ||
                 ((alignment & DesignerUtils.anyTopAlignment) != 0)) {
                if (borderStyle == BorderStyle.None) { 
                    return 0;
                } 
                else if ((borderStyle == BorderStyle.FixedSingle) || (borderStyle == BorderStyle.Fixed3D)) { 
                    return 1;
                } 
                else {
                    Debug.Fail("Unknown BorderStyle");
                    return 0;
                } 
            }
            else {//bottom alignment 
                if (borderStyle == BorderStyle.None) { 
                    return -1;
                } 
                else if ((borderStyle == BorderStyle.FixedSingle) || (borderStyle == BorderStyle.Fixed3D)) {
                    return 0;
                }
                else { 
                    Debug.Fail("Unknown BorderStyle");
                    return 0; 
                } 
            }
        } 

        /// 
        /// 
        ///     Retrieves a set of rules concerning the movement capabilities of a component. 
        ///     This should be one or more flags from the SelectionRules class.  If no designer
        ///     provides rules for a component, the component will not get any UI services. 
        ///  
        public override SelectionRules SelectionRules {
            get { 
                SelectionRules rules = base.SelectionRules;
                object component = Component;

                PropertyDescriptor propAutoSize = TypeDescriptor.GetProperties(component)["AutoSize"]; 
                if (propAutoSize != null) {
                    bool autoSize = (bool)propAutoSize.GetValue(component); 
 
                    if (autoSize)
                        rules &= ~SelectionRules.AllSizeable; 
                }

                return rules;
            } 
        }
    } 
} 

 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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LabelDesigner.cs source code in C# .NET

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