Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / ScrollBarRenderer.cs / 1 / ScrollBarRenderer.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using System; using System.Drawing; using System.Windows.Forms.VisualStyles; using System.Diagnostics.CodeAnalysis; using Microsoft.Win32; ////// /// public sealed class ScrollBarRenderer { //Make this per-thread, so that different threads can safely use these methods. [ThreadStatic] private static VisualStyleRenderer visualStyleRenderer = null; //cannot instantiate private ScrollBarRenderer() { } ////// This is a rendering class for the ScrollBar control. /// ////// /// public static bool IsSupported { get { return VisualStyleRenderer.IsSupported; // no downlevel support } } ////// Returns true if this class is supported for the current OS and user/application settings, /// otherwise returns false. /// ////// /// [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally public static void DrawArrowButton(Graphics g, Rectangle bounds, ScrollBarArrowButtonState state) { InitializeRenderer(VisualStyleElement.ScrollBar.ArrowButton.LeftNormal, (int)state); visualStyleRenderer.DrawBackground(g, bounds); } ////// Renders a ScrollBar arrow button. /// ////// /// [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally public static void DrawHorizontalThumb(Graphics g, Rectangle bounds, ScrollBarState state) { InitializeRenderer(VisualStyleElement.ScrollBar.ThumbButtonHorizontal.Normal, (int)state); visualStyleRenderer.DrawBackground(g, bounds); } ////// Renders a horizontal ScrollBar thumb. /// ////// /// [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally public static void DrawVerticalThumb(Graphics g, Rectangle bounds, ScrollBarState state) { InitializeRenderer(VisualStyleElement.ScrollBar.ThumbButtonVertical.Normal, (int)state); visualStyleRenderer.DrawBackground(g, bounds); } ////// Renders a vertical ScrollBar thumb. /// ////// /// [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally public static void DrawHorizontalThumbGrip(Graphics g, Rectangle bounds, ScrollBarState state) { InitializeRenderer(VisualStyleElement.ScrollBar.GripperHorizontal.Normal, (int)state); visualStyleRenderer.DrawBackground(g, bounds); } ////// Renders a horizontal ScrollBar thumb grip. /// ////// /// [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally public static void DrawVerticalThumbGrip(Graphics g, Rectangle bounds, ScrollBarState state) { InitializeRenderer(VisualStyleElement.ScrollBar.GripperVertical.Normal, (int)state); visualStyleRenderer.DrawBackground(g, bounds); } ////// Renders a vertical ScrollBar thumb grip. /// ////// /// [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally public static void DrawRightHorizontalTrack(Graphics g, Rectangle bounds, ScrollBarState state) { InitializeRenderer(VisualStyleElement.ScrollBar.RightTrackHorizontal.Normal, (int)state); visualStyleRenderer.DrawBackground(g, bounds); } ////// Renders a horizontal ScrollBar thumb. /// ////// /// [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally public static void DrawLeftHorizontalTrack(Graphics g, Rectangle bounds, ScrollBarState state) { InitializeRenderer(VisualStyleElement.ScrollBar.LeftTrackHorizontal.Normal, (int)state); visualStyleRenderer.DrawBackground(g, bounds); } ////// Renders a horizontal ScrollBar thumb. /// ////// /// [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally public static void DrawUpperVerticalTrack(Graphics g, Rectangle bounds, ScrollBarState state) { InitializeRenderer(VisualStyleElement.ScrollBar.UpperTrackVertical.Normal, (int)state); visualStyleRenderer.DrawBackground(g, bounds); } ////// Renders a vertical ScrollBar thumb in the center of the given bounds. /// ////// /// [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally public static void DrawLowerVerticalTrack(Graphics g, Rectangle bounds, ScrollBarState state) { InitializeRenderer(VisualStyleElement.ScrollBar.LowerTrackVertical.Normal, (int)state); visualStyleRenderer.DrawBackground(g, bounds); } ////// Renders a vertical ScrollBar thumb in the center of the given bounds. /// ////// /// [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally public static void DrawSizeBox(Graphics g, Rectangle bounds, ScrollBarSizeBoxState state) { InitializeRenderer(VisualStyleElement.ScrollBar.SizeBox.LeftAlign, (int)state); visualStyleRenderer.DrawBackground(g, bounds); } ////// Renders a ScrollBar size box in the center of the given bounds. /// ////// /// [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally public static Size GetThumbGripSize(Graphics g, ScrollBarState state) { InitializeRenderer(VisualStyleElement.ScrollBar.GripperHorizontal.Normal, (int)state); return visualStyleRenderer.GetPartSize(g, ThemeSizeType.True); } ////// Returns the size of the ScrollBar thumb grip. /// ////// /// [SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")] // Using Graphics instead of IDeviceContext intentionally public static Size GetSizeBoxSize(Graphics g, ScrollBarState state) { InitializeRenderer(VisualStyleElement.ScrollBar.SizeBox.LeftAlign, (int)state); return visualStyleRenderer.GetPartSize(g, ThemeSizeType.True); } private static void InitializeRenderer(VisualStyleElement element, int state) { if (visualStyleRenderer == null) { visualStyleRenderer = new VisualStyleRenderer(element.ClassName, element.Part, state); } else { visualStyleRenderer.SetParameters(element.ClassName, element.Part, state); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved./// Returns the size of the ScrollBar size box. /// ///
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