Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / ComboBoxRenderer.cs / 1 / ComboBoxRenderer.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using System; using System.Drawing; using System.Diagnostics.CodeAnalysis; using System.Windows.Forms.Internal; using System.Windows.Forms.VisualStyles; using Microsoft.Win32; ////// /// public sealed class ComboBoxRenderer { //Make this per-thread, so that different threads can safely use these methods. [ThreadStatic] private static VisualStyleRenderer visualStyleRenderer = null; private static readonly VisualStyleElement ComboBoxElement = VisualStyleElement.ComboBox.DropDownButton.Normal; private static readonly VisualStyleElement TextBoxElement = VisualStyleElement.TextBox.TextEdit.Normal; //cannot instantiate private ComboBoxRenderer() { } ////// This is a rendering class for the ComboBox control. /// ////// /// public static bool IsSupported { get { return VisualStyleRenderer.IsSupported; // no downlevel support } } private static void DrawBackground(Graphics g, Rectangle bounds, ComboBoxState state) { visualStyleRenderer.DrawBackground(g, bounds); //for disabled comboboxes, comctl does not use the window backcolor, so // we don't refill here in that case. if (state != ComboBoxState.Disabled) { Color windowColor = visualStyleRenderer.GetColor(ColorProperty.FillColor); if (windowColor != SystemColors.Window) { Rectangle fillRect = visualStyleRenderer.GetBackgroundContentRectangle(g, bounds); fillRect.Inflate(-2, -2); //then we need to re-fill the background. g.FillRectangle(SystemBrushes.Window, fillRect); } } } ////// 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 DrawTextBox(Graphics g, Rectangle bounds, ComboBoxState state) { if (visualStyleRenderer == null) { visualStyleRenderer = new VisualStyleRenderer(TextBoxElement.ClassName, TextBoxElement.Part, (int)state); } else { visualStyleRenderer.SetParameters(TextBoxElement.ClassName, TextBoxElement.Part, (int)state); } DrawBackground(g, bounds, state); } ////// Renders the textbox part of a ComboBox control. /// ////// /// public static void DrawTextBox(Graphics g, Rectangle bounds, string comboBoxText, Font font, ComboBoxState state) { DrawTextBox(g, bounds, comboBoxText, font, TextFormatFlags.TextBoxControl, state); } ////// Renders the textbox part of a ComboBox control. /// ////// /// public static void DrawTextBox(Graphics g, Rectangle bounds, string comboBoxText, Font font, Rectangle textBounds, ComboBoxState state) { DrawTextBox(g, bounds, comboBoxText, font, textBounds, TextFormatFlags.TextBoxControl, state); } ////// Renders the textbox part of a ComboBox control. /// ////// /// public static void DrawTextBox(Graphics g, Rectangle bounds, string comboBoxText, Font font, TextFormatFlags flags, ComboBoxState state) { if (visualStyleRenderer == null) { visualStyleRenderer = new VisualStyleRenderer(TextBoxElement.ClassName, TextBoxElement.Part, (int)state); } else { visualStyleRenderer.SetParameters(TextBoxElement.ClassName, TextBoxElement.Part, (int)state); } Rectangle textBounds = visualStyleRenderer.GetBackgroundContentRectangle(g, bounds); textBounds.Inflate(-2,-2); DrawTextBox(g, bounds, comboBoxText, font, textBounds, flags, state); } ////// Renders the textbox part of a ComboBox control. /// ////// /// [ SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters") // Using Graphics instead of IDeviceContext intentionally ] public static void DrawTextBox(Graphics g, Rectangle bounds, string comboBoxText, Font font, Rectangle textBounds, TextFormatFlags flags, ComboBoxState state) { if (visualStyleRenderer == null) { visualStyleRenderer = new VisualStyleRenderer(TextBoxElement.ClassName, TextBoxElement.Part, (int)state); } else { visualStyleRenderer.SetParameters(TextBoxElement.ClassName, TextBoxElement.Part, (int)state); } DrawBackground(g, bounds, state); Color textColor = visualStyleRenderer.GetColor(ColorProperty.TextColor); TextRenderer.DrawText(g, comboBoxText, font, textBounds, textColor, flags); } ////// Renders the textbox part of a ComboBox control. /// ////// /// [ SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters") // Using Graphics instead of IDeviceContext intentionally ] public static void DrawDropDownButton(Graphics g, Rectangle bounds, ComboBoxState state) { if (visualStyleRenderer == null) { visualStyleRenderer = new VisualStyleRenderer(ComboBoxElement.ClassName, ComboBoxElement.Part, (int)state); } else { visualStyleRenderer.SetParameters(ComboBoxElement.ClassName, ComboBoxElement.Part, (int)state); } visualStyleRenderer.DrawBackground(g, bounds); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved./// Renders a ComboBox drop-down button. /// ///
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