Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / PropertyGridInternal / DocComment.cs / 1 / 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. // Copyright (c) Microsoft Corporation. All rights reserved.
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