//------------------------------------------------------------------------------
// <copyright file="TabRenderer.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>                                                                
//------------------------------------------------------------------------------
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;
 
    /// <include file='doc\TabRenderer.uex' path='docs/doc[@for="TabRenderer"]/*' />
    /// <devdoc>
    ///    <para>
    ///       This is a rendering class for the Tab control.
    ///    </para>
    /// </devdoc>
    public sealed class TabRenderer {
 
       //Make this per-thread, so that different threads can safely use these methods.
       [ThreadStatic]
       private static VisualStyleRenderer visualStyleRenderer = null;
       
        //cannot instantiate
       private TabRenderer() {
       }
 
       /// <include file='doc\TabRenderer.uex' path='docs/doc[@for="TabRenderer.IsSupported"]/*' />
       /// <devdoc>
       ///    <para>
       ///       Returns true if this class is supported for the current OS and user/application settings, 
       ///       otherwise returns false.
       ///    </para>
       /// </devdoc>
       public static bool IsSupported {
           get {
               return VisualStyleRenderer.IsSupported; // no downlevel support
           }
       }
 
       /// <include file='doc\TabRenderer.uex' path='docs/doc[@for="TabRenderer.DrawTabItem"]/*' />
       /// <devdoc>
       ///    <para>
       ///       Renders a Tab item.
       ///    </para>
       /// </devdoc>
       [
           SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters") // Using Graphics instead of IDeviceContext intentionally
       ]
       public static void DrawTabItem(Graphics g, Rectangle bounds, TabItemState state) {
           InitializeRenderer(VisualStyleElement.Tab.TabItem.Normal, (int)state);
 
           visualStyleRenderer.DrawBackground(g, bounds);
       }
 
       /// <include file='doc\TabRenderer.uex' path='docs/doc[@for="TabRenderer.DrawTabItem1"]/*' />
       /// <devdoc>
       ///    <para>
       ///       Renders a Tab item.
       ///    </para>
       /// </devdoc>
       public static void DrawTabItem(Graphics g, Rectangle bounds, bool focused, TabItemState state) {
           InitializeRenderer(VisualStyleElement.Tab.TabItem.Normal, (int)state);
 
           visualStyleRenderer.DrawBackground(g, bounds);
 
           // I need this hack since GetBackgroundContentRectangle() returns same rectangle
           // as bounds for this control!
           Rectangle contentBounds = Rectangle.Inflate(bounds, -3, -3);
           if (focused) {
               ControlPaint.DrawFocusRectangle(g, contentBounds);
           }
       }
 
       /// <include file='doc\TabRenderer.uex' path='docs/doc[@for="TabRenderer.DrawTabItem2"]/*' />
       /// <devdoc>
       ///    <para>
       ///       Renders a Tab item.
       ///    </para>
       /// </devdoc>
       public static void DrawTabItem(Graphics g, Rectangle bounds, string tabItemText, Font font, TabItemState state) {
           DrawTabItem(g, bounds, tabItemText, font, false, state);
       }
 
       /// <include file='doc\TabRenderer.uex' path='docs/doc[@for="TabRenderer.DrawTabItem3"]/*' />
       /// <devdoc>
       ///    <para>
       ///       Renders a Tab item.
       ///    </para>
       /// </devdoc>
       public static void DrawTabItem(Graphics g, Rectangle bounds, string tabItemText, Font font, bool focused, TabItemState state) {
           DrawTabItem(g, bounds, tabItemText, font, 
                       TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter | TextFormatFlags.SingleLine,
                       focused, state);
       }
 
       /// <include file='doc\TabRenderer.uex' path='docs/doc[@for="TabRenderer.DrawTabItem4"]/*' />
       /// <devdoc>
       ///    <para>
       ///       Renders a Tab item.
       ///    </para>
       /// </devdoc>
       public static void DrawTabItem(Graphics g, Rectangle bounds, string tabItemText, Font font, TextFormatFlags flags, bool focused, TabItemState state) {
           InitializeRenderer(VisualStyleElement.Tab.TabItem.Normal, (int)state);
           visualStyleRenderer.DrawBackground(g, bounds);
 
           // I need this hack since GetBackgroundContentRectangle() returns same rectangle
           // as bounds for this control!
           Rectangle contentBounds = Rectangle.Inflate(bounds, -3, -3);
           Color textColor = visualStyleRenderer.GetColor(ColorProperty.TextColor);
           TextRenderer.DrawText(g, tabItemText, font, contentBounds, textColor, flags);
 
           if (focused) {
               ControlPaint.DrawFocusRectangle(g, contentBounds);
           }
       }
 
       /// <include file='doc\TabRenderer.uex' path='docs/doc[@for="TabRenderer.DrawTabItem5"]/*' />
       /// <devdoc>
       ///    <para>
       ///       Renders a Tab item.
       ///    </para>
       /// </devdoc>
       public static void DrawTabItem(Graphics g, Rectangle bounds, Image image, Rectangle imageRectangle, bool focused, TabItemState state) {
           InitializeRenderer(VisualStyleElement.Tab.TabItem.Normal, (int)state);
 
           visualStyleRenderer.DrawBackground(g, bounds);
 
           // I need this hack since GetBackgroundContentRectangle() returns same rectangle
           // as bounds for this control!
           Rectangle contentBounds = Rectangle.Inflate(bounds, -3, -3);
           
           visualStyleRenderer.DrawImage(g, imageRectangle, image);
           
           if (focused) {
               ControlPaint.DrawFocusRectangle(g, contentBounds);
           }
       }
 
       /// <include file='doc\TabRenderer.uex' path='docs/doc[@for="TabRenderer.DrawTabItem6"]/*' />
       /// <devdoc>
       ///    <para>
       ///       Renders a Tab item.
       ///    </para>
       /// </devdoc>
       public static void DrawTabItem(Graphics g, Rectangle bounds, string tabItemText, Font font, Image image, Rectangle imageRectangle, bool focused, TabItemState state) {
           DrawTabItem(g, bounds, tabItemText, font, 
                       TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter | TextFormatFlags.SingleLine,
                       image, imageRectangle, focused, state);
       }
 
       /// <include file='doc\TabRenderer.uex' path='docs/doc[@for="TabRenderer.DrawTabItem7"]/*' />
       /// <devdoc>
       ///    <para>
       ///       Renders a Tab item.
       ///    </para>
       /// </devdoc>
       public static void DrawTabItem(Graphics g, Rectangle bounds, string tabItemText, Font font, TextFormatFlags flags, Image image, Rectangle imageRectangle, bool focused, TabItemState state) {
           InitializeRenderer(VisualStyleElement.Tab.TabItem.Normal, (int)state);
 
           visualStyleRenderer.DrawBackground(g, bounds);
 
           // I need this hack since GetBackgroundContentRectangle() returns same rectangle
           // as bounds for this control!
           Rectangle contentBounds = Rectangle.Inflate(bounds, -3, -3);
           visualStyleRenderer.DrawImage(g, imageRectangle, image);
           Color textColor = visualStyleRenderer.GetColor(ColorProperty.TextColor);
           TextRenderer.DrawText(g, tabItemText, font, contentBounds, textColor, flags);
           
           if (focused) {
               ControlPaint.DrawFocusRectangle(g, contentBounds);
           }
       }
 
       /// <include file='doc\TabRenderer.uex' path='docs/doc[@for="TabRenderer.DrawTabPage"]/*' />
       /// <devdoc>
       ///    <para>
       ///       Renders a TabPage.
       ///    </para>
       /// </devdoc>
       [
           SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters") // Using Graphics instead of IDeviceContext intentionally
       ]
       public static void DrawTabPage(Graphics g, Rectangle bounds) {
           InitializeRenderer(VisualStyleElement.Tab.Pane.Normal, 0);
 
           visualStyleRenderer.DrawBackground(g, bounds);
       }
 
       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);
           }
       }
    }
}