Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / GroupBoxRenderer.cs / 1 / GroupBoxRenderer.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using System; using System.Drawing; using System.Windows.Forms.Internal; using System.Diagnostics; using System.Diagnostics.CodeAnalysis; using System.Windows.Forms.VisualStyles; using Microsoft.Win32; ////// /// public sealed class GroupBoxRenderer { //Make this per-thread, so that different threads can safely use these methods. [ThreadStatic] private static VisualStyleRenderer visualStyleRenderer = null; private static readonly VisualStyleElement GroupBoxElement = VisualStyleElement.Button.GroupBox.Normal; private const int textOffset = 8; //MAGIC NUMBER - WHERE DID IT COME FROM? private const int boxHeaderWidth = 7; // VSWhidbey 514912: The groupbox frame shows 7 pixels before the caption. private static bool renderMatchingApplicationState = true; //cannot instantiate private GroupBoxRenderer() { } ////// This is a rendering class for the GroupBox control. /// ////// /// public static bool RenderMatchingApplicationState { get { return renderMatchingApplicationState; } set { renderMatchingApplicationState = value; } } private static bool RenderWithVisualStyles { get { return (!renderMatchingApplicationState || Application.RenderWithVisualStyles); } } ////// If this property is true, then the renderer will use the setting from Application.RenderWithVisualStyles to /// determine how to render. /// If this property is false, the renderer will always render with visualstyles. /// ////// /// public static bool IsBackgroundPartiallyTransparent(GroupBoxState state) { if (RenderWithVisualStyles) { InitializeRenderer((int)state); return visualStyleRenderer.IsBackgroundPartiallyTransparent(); } else { return false; //for downlevel, this is false } } ////// Returns true if the background corresponding to the given state is partially transparent, else false. /// ////// /// [ SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters") // Using Graphics instead of IDeviceContext intentionally ] public static void DrawParentBackground(Graphics g, Rectangle bounds, Control childControl) { if (RenderWithVisualStyles) { InitializeRenderer(0); visualStyleRenderer.DrawParentBackground(g, bounds, childControl); } } ////// This is just a convenience wrapper for VisualStyleRenderer.DrawThemeParentBackground. For downlevel, /// this isn't required and does nothing. /// ////// /// public static void DrawGroupBox(Graphics g, Rectangle bounds, GroupBoxState state) { if (RenderWithVisualStyles) DrawThemedGroupBoxNoText(g, bounds, state); else DrawUnthemedGroupBoxNoText(g, bounds, state); } ////// Renders a GroupBox control. /// ////// /// public static void DrawGroupBox(Graphics g, Rectangle bounds, string groupBoxText, Font font, GroupBoxState state) { DrawGroupBox(g, bounds, groupBoxText, font, TextFormatFlags.Top | TextFormatFlags.Left, state); } ////// Renders a GroupBox control. Uses the text color specified by the theme. /// ////// /// public static void DrawGroupBox(Graphics g, Rectangle bounds, string groupBoxText, Font font, Color textColor, GroupBoxState state) { DrawGroupBox(g, bounds, groupBoxText, font, textColor, TextFormatFlags.Top | TextFormatFlags.Left, state); } ////// Renders a GroupBox control. /// ////// /// public static void DrawGroupBox(Graphics g, Rectangle bounds, string groupBoxText, Font font, TextFormatFlags flags, GroupBoxState state) { if (RenderWithVisualStyles) DrawThemedGroupBoxWithText(g, bounds, groupBoxText, font, DefaultTextColor(state), flags, state); else DrawUnthemedGroupBoxWithText(g, bounds, groupBoxText, font, DefaultTextColor(state), flags, state); } ////// Renders a GroupBox control. Uses the text color specified by the theme. /// ////// /// public static void DrawGroupBox(Graphics g, Rectangle bounds, string groupBoxText, Font font, Color textColor, TextFormatFlags flags, GroupBoxState state) { if (RenderWithVisualStyles) DrawThemedGroupBoxWithText(g, bounds, groupBoxText, font, textColor, flags, state); else DrawUnthemedGroupBoxWithText(g, bounds, groupBoxText, font, textColor, flags, state); } ////// Renders a GroupBox control. /// ////// Draws a themed GroupBox with no text label. /// ///private static void DrawThemedGroupBoxNoText(Graphics g, Rectangle bounds, GroupBoxState state) { InitializeRenderer((int)state); visualStyleRenderer.DrawBackground(g, bounds); } /// /// Draws a themed GroupBox with a text label. /// ///private static void DrawThemedGroupBoxWithText(Graphics g, Rectangle bounds, string groupBoxText, Font font, Color textColor, TextFormatFlags flags, GroupBoxState state) { InitializeRenderer((int)state); // Calculate text area, and render text inside it Rectangle textBounds = bounds; textBounds.Width -= 2 * boxHeaderWidth; Size measuredBounds = TextRenderer.MeasureText(g, groupBoxText, font, new Size(textBounds.Width, textBounds.Height), flags); textBounds.Width = measuredBounds.Width; textBounds.Height = measuredBounds.Height; if ((flags & TextFormatFlags.Right) == TextFormatFlags.Right) { textBounds.X = bounds.Right - textBounds.Width - boxHeaderWidth + 1; // +1 to account for the margin built in the MeasureText result } else { textBounds.X += boxHeaderWidth - 1; // -1 to account for the margin built in the MeasureText result } TextRenderer.DrawText(g, groupBoxText, font, textBounds, textColor, flags); // Calculate area for background box Rectangle boxBounds = bounds; boxBounds.Y += font.Height / 2; boxBounds.Height -= font.Height / 2; // Break box into three segments, that don't overlap the text area Rectangle clipLeft = boxBounds; Rectangle clipMiddle = boxBounds; Rectangle clipRight = boxBounds; clipLeft.Width = boxHeaderWidth; clipMiddle.Width = Math.Max(0, textBounds.Width - 3); // -3 to account for the margin built in the MeasureText result if ((flags & TextFormatFlags.Right) == TextFormatFlags.Right) { clipLeft.X = boxBounds.Right - boxHeaderWidth; clipMiddle.X = clipLeft.Left - clipMiddle.Width; clipRight.Width = clipMiddle.X - boxBounds.X; } else { clipMiddle.X = clipLeft.Right; clipRight.X = clipMiddle.Right; clipRight.Width = boxBounds.Right - clipRight.X; } clipMiddle.Y = textBounds.Bottom; clipMiddle.Height -= (textBounds.Bottom - boxBounds.Top); Debug.Assert(textBounds.Y <= boxBounds.Y, "if text below box, need to render area of box above text"); // Render clipped portion of background in each segment visualStyleRenderer.DrawBackground(g, boxBounds, clipLeft); visualStyleRenderer.DrawBackground(g, boxBounds, clipMiddle); visualStyleRenderer.DrawBackground(g, boxBounds, clipRight); } /// /// Draws an un-themed GroupBox with no text label. /// ///private static void DrawUnthemedGroupBoxNoText(Graphics g, Rectangle bounds, GroupBoxState state) { Color backColor = SystemColors.Control; Pen light = new Pen(ControlPaint.Light(backColor, 1.0f)); Pen dark = new Pen(ControlPaint.Dark(backColor, 0f)); try { // left g.DrawLine(light, bounds.Left + 1, bounds.Top + 1, bounds.Left + 1, bounds.Height - 1); g.DrawLine(dark, bounds.Left, bounds.Top + 1, bounds.Left, bounds.Height - 2); // bottom g.DrawLine(light, bounds.Left, bounds.Height - 1, bounds.Width - 1, bounds.Height - 1); g.DrawLine(dark, bounds.Left, bounds.Height - 2, bounds.Width - 1, bounds.Height - 2); // top g.DrawLine(light, bounds.Left + 1, bounds.Top + 1, bounds.Width - 1, bounds.Top + 1); g.DrawLine(dark, bounds.Left, bounds.Top, bounds.Width - 2, bounds.Top); // right g.DrawLine(light, bounds.Width - 1, bounds.Top, bounds.Width - 1, bounds.Height - 1); g.DrawLine(dark, bounds.Width - 2, bounds.Top, bounds.Width - 2, bounds.Height - 2); } finally { if (light != null) { light.Dispose(); } if (dark != null) { dark.Dispose(); } } } /// /// Draws an un-themed GroupBox with a text label. /// Variation of the logic in GroupBox.DrawGroupBox(). /// ///private static void DrawUnthemedGroupBoxWithText(Graphics g, Rectangle bounds, string groupBoxText, Font font, Color textColor, TextFormatFlags flags, GroupBoxState state) { // Calculate text area, and render text inside it Rectangle textBounds = bounds; textBounds.Width -= textOffset; Size measuredBounds = TextRenderer.MeasureText(g, groupBoxText, font, new Size(textBounds.Width, textBounds.Height), flags); textBounds.Width = measuredBounds.Width; textBounds.Height = measuredBounds.Height; if ((flags & TextFormatFlags.Right) == TextFormatFlags.Right) { textBounds.X = bounds.Right - textBounds.Width - textOffset; } else { textBounds.X += textOffset; } TextRenderer.DrawText(g, groupBoxText, font, textBounds, textColor, flags); // Pad text area to stop background from touching text if (textBounds.Width > 0) textBounds.Inflate(2, 0); Pen light = new Pen(SystemColors.ControlLight); Pen dark = new Pen(SystemColors.ControlDark); int boxTop = bounds.Top + font.Height / 2; // left g.DrawLine(light, bounds.Left + 1, boxTop, bounds.Left + 1, bounds.Height - 1); g.DrawLine(dark, bounds.Left, boxTop - 1, bounds.Left, bounds.Height - 2); // bottom g.DrawLine(light, bounds.Left, bounds.Height - 1, bounds.Width, bounds.Height - 1); g.DrawLine(dark, bounds.Left, bounds.Height - 2, bounds.Width - 1, bounds.Height - 2); // top-left g.DrawLine(light, bounds.Left + 1, boxTop, textBounds.X - 2, boxTop); g.DrawLine(dark, bounds.Left, boxTop - 1, textBounds.X - 3, boxTop - 1); // top-right g.DrawLine(light, textBounds.X + textBounds.Width + 1, boxTop, bounds.Width - 1, boxTop); g.DrawLine(dark, textBounds.X + textBounds.Width + 2, boxTop - 1, bounds.Width - 2, boxTop - 1); // right g.DrawLine(light, bounds.Width - 1, boxTop, bounds.Width - 1, bounds.Height - 1); g.DrawLine(dark, bounds.Width - 2, boxTop - 1, bounds.Width - 2, bounds.Height - 2); } private static Color DefaultTextColor(GroupBoxState state) { if (RenderWithVisualStyles) { InitializeRenderer((int)state); return visualStyleRenderer.GetColor(ColorProperty.TextColor); } else { return SystemColors.ControlText; } } private static void InitializeRenderer(int state) { if (visualStyleRenderer == null) { visualStyleRenderer = new VisualStyleRenderer(GroupBoxElement.ClassName, GroupBoxElement.Part, state); } else { visualStyleRenderer.SetParameters(GroupBoxElement.ClassName, GroupBoxElement.Part, state); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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