DocComment.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / PropertyGridInternal / DocComment.cs / 1305376 / DocComment.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 
namespace System.Windows.Forms.PropertyGridInternal {
 
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis;

    using System; 
    using System.Windows.Forms;
 
    using System.ComponentModel; 
    using System.ComponentModel.Design;
    using System.Drawing; 
    using Microsoft.Win32;
    using System.Windows.Forms.Layout;

    internal class DocComment : PropertyGrid.SnappableControl { 

        private Label m_labelTitle; 
        private Label m_labelDesc; 
        private string fullDesc;
 
        protected int lineHeight;
        private bool needUpdateUIWithFont = true;

        protected const int CBORDER = 3; 
        protected const int CXDEF = 0;
        protected const int CYDEF = 59; 
        protected const int MIN_LINES = 2; 

        internal Rectangle rect = Rectangle.Empty; 

        internal DocComment(PropertyGrid owner) : base(owner) {
            SuspendLayout();
            m_labelTitle = new Label(); 
            m_labelTitle.UseMnemonic = false;
            m_labelTitle.Cursor = Cursors.Default; 
            m_labelDesc = new Label(); 
            m_labelDesc.AutoEllipsis = true;
            m_labelDesc.Cursor = Cursors.Default; 

            UpdateTextRenderingEngine();

            Controls.Add(m_labelTitle); 
            Controls.Add(m_labelDesc);
 
            Size = new Size(CXDEF,CYDEF); 

            this.Text = SR.GetString(SR.PBRSDocCommentPaneTitle); 
            SetStyle(ControlStyles.Selectable, false);
            ResumeLayout(false);
        }
 
        public virtual int Lines {
            get { 
                UpdateUIWithFont(); 
                return Height/lineHeight;
            } 
            set {
                UpdateUIWithFont();
                Size = new Size(Width, 1 + value * lineHeight);
            } 
        }
 
        public override int GetOptimalHeight(int width) { 
            UpdateUIWithFont();
            // compute optimal label height as one line only. 
            int height = m_labelTitle.Size.Height;

            // do this to avoid getting parented to the Parking window.
            // 
            if (this.ownerGrid.IsHandleCreated && !IsHandleCreated) {
                CreateControl(); 
            } 

            // compute optimal text height 
            Graphics g = m_labelDesc.CreateGraphicsInternal();
            SizeF sizef = PropertyGrid.MeasureTextHelper.MeasureText( this.ownerGrid, g, m_labelTitle.Text, Font, width);
            Size sz = Size.Ceiling(sizef);
            g.Dispose(); 
            height += (sz.Height * 2) + 2;
            return Math.Max(height + 4, CYDEF); 
        } 

        internal virtual void LayoutWindow() { 
        }

        protected override void OnFontChanged(EventArgs e) {
            needUpdateUIWithFont = true; 
            PerformLayout();
            base.OnFontChanged(e); 
        } 

        protected override void OnLayout(LayoutEventArgs e) { 
            UpdateUIWithFont();
            Size size = ClientSize;

            // if the client size is 0, setting this to a negative number 
            // will force an extra layout.
            size.Width = Math.Max(0,  size.Width  -  2*CBORDER); 
            size.Height = Math.Max(0, size.Height -  2*CBORDER); 

            // calling SetBounds is slightly more efficient than allocating 
            // a size struct and setting it into Size prop.
            m_labelTitle.SetBounds(m_labelTitle.Top,
                                   m_labelTitle.Left,
                                   size.Width, 
                                   Math.Min(lineHeight, size.Height),
                                   BoundsSpecified.Size); 
 
            m_labelDesc.SetBounds(m_labelDesc.Top,
                                  m_labelDesc.Left, 
                                  size.Width,
                                  Math.Max(0,size.Height-lineHeight-1),
                                  BoundsSpecified.Size);
 
            m_labelDesc.Text = this.fullDesc;
            m_labelDesc.AccessibleName = this.fullDesc; // Don't crop the description for accessibility clients 
            base.OnLayout(e); 
        }
 
        protected override void OnResize(EventArgs e) {
            Rectangle newRect = ClientRectangle;
            if (!rect.IsEmpty && newRect.Width > rect.Width) {
                Rectangle rectInvalidate = new Rectangle(rect.Width-1,0,newRect.Width-rect.Width+1,rect.Height); 
                Invalidate(rectInvalidate);
            } 
            rect = newRect; 
            base.OnResize(e);
        } 

        protected override void OnHandleCreated(EventArgs e) {
            base.OnHandleCreated(e);
            UpdateUIWithFont(); 
        }
 
        public virtual void SetComment(string title, string desc) { 
            if (m_labelDesc.Text != title) {
                m_labelTitle.Text = title; 
            }

            if (desc != fullDesc) {
                this.fullDesc = desc; 
                m_labelDesc.Text = fullDesc;
                m_labelDesc.AccessibleName = this.fullDesc; // Don't crop the description for accessibility clients 
            } 
        }
 
        public override int SnapHeightRequest(int cyNew) {
            UpdateUIWithFont();
            int lines = Math.Max(MIN_LINES, cyNew/lineHeight);
            return 1 + lines*lineHeight; 
        }
 
        internal void UpdateTextRenderingEngine() { 
            m_labelTitle.UseCompatibleTextRendering = this.ownerGrid.UseCompatibleTextRendering;
            m_labelDesc.UseCompatibleTextRendering = this.ownerGrid.UseCompatibleTextRendering; 
        }

        private void UpdateUIWithFont() {
            if (IsHandleCreated && needUpdateUIWithFont) { 

                // Some fonts throw because Bold is not a valid option 
                // for them.  Fail gracefully. 
                try {
                    m_labelTitle.Font = new Font(Font, FontStyle.Bold); 
                }
                catch {
                }
 
                lineHeight = (int)Font.Height + 2;
 
                m_labelTitle.Location = new Point(CBORDER, CBORDER); 
                m_labelDesc.Location = new Point(CBORDER, CBORDER + lineHeight);
 
                needUpdateUIWithFont = false;
                PerformLayout();
            }
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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DocComment.cs source code in C# .NET

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