DataGridToolTip.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / DataGridToolTip.cs / 1 / DataGridToolTip.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms { 
    using System.Runtime.Remoting; 
    using System.Runtime.InteropServices;
    using System.Drawing; 

    using System.Windows.Forms;
    using Microsoft.Win32;
    using System.Diagnostics; 
    using System.ComponentModel;
 
    // this class is basically a NativeWindow that does toolTipping 
    // should be one for the entire grid
    internal class DataGridToolTip : MarshalByRefObject { 
        // the toolTip control
        private NativeWindow tipWindow = null;

        // the dataGrid which contains this toolTip 
        private DataGrid dataGrid = null;
 
        // CONSTRUCTOR 
        public DataGridToolTip(DataGrid dataGrid)
        { 
            Debug.Assert(dataGrid!= null, "can't attach a tool tip to a null grid");
            this.dataGrid = dataGrid;
        }
 
        // will ensure that the toolTip window was created
        public void CreateToolTipHandle() 
        { 
            if (tipWindow == null || tipWindow.Handle == IntPtr.Zero)
            { 
                NativeMethods.INITCOMMONCONTROLSEX icc = new NativeMethods.INITCOMMONCONTROLSEX();
                icc.dwICC = NativeMethods.ICC_TAB_CLASSES;
                icc.dwSize = Marshal.SizeOf(icc);
                SafeNativeMethods.InitCommonControlsEx(icc); 
                CreateParams cparams = new CreateParams();
                cparams.Parent = dataGrid.Handle; 
                cparams.ClassName = NativeMethods.TOOLTIPS_CLASS; 
                cparams.Style = NativeMethods.TTS_ALWAYSTIP;
                tipWindow = new NativeWindow(); 
                tipWindow.CreateHandle(cparams);

                UnsafeNativeMethods.SendMessage(new HandleRef(tipWindow, tipWindow.Handle), NativeMethods.TTM_SETMAXTIPWIDTH, 0, SystemInformation.MaxWindowTrackSize.Width);
                SafeNativeMethods.SetWindowPos(new HandleRef(tipWindow, tipWindow.Handle), NativeMethods.HWND_NOTOPMOST, 0, 0, 0, 0, NativeMethods.SWP_NOSIZE | NativeMethods.SWP_NOMOVE | NativeMethods.SWP_NOACTIVATE); 
                UnsafeNativeMethods.SendMessage(new HandleRef(tipWindow, tipWindow.Handle), NativeMethods.TTM_SETDELAYTIME, NativeMethods.TTDT_INITIAL, 0);
            } 
        } 

        // this function will add a toolTip to the 
        // windows system
        public void AddToolTip(String toolTipString, IntPtr toolTipId, Rectangle iconBounds)
        {
            Debug.Assert(tipWindow != null && tipWindow.Handle != IntPtr.Zero, "the tipWindow was not initialized, bailing out"); 

            if (toolTipString == null) 
                throw new ArgumentNullException("toolTipString"); 
            if (iconBounds.IsEmpty)
                throw new ArgumentNullException("iconBounds", SR.GetString(SR.DataGridToolTipEmptyIcon)); 

            NativeMethods.TOOLINFO_T toolInfo = new NativeMethods.TOOLINFO_T();
            toolInfo.cbSize = Marshal.SizeOf(toolInfo);
            toolInfo.hwnd = dataGrid.Handle; 
            toolInfo.uId = toolTipId;
            toolInfo.lpszText = toolTipString; 
            toolInfo.rect = NativeMethods.RECT.FromXYWH(iconBounds.X, iconBounds.Y, iconBounds.Width, iconBounds.Height); 
            toolInfo.uFlags = NativeMethods.TTF_SUBCLASS;
            UnsafeNativeMethods.SendMessage(new HandleRef(tipWindow, tipWindow.Handle), NativeMethods.TTM_ADDTOOL, 0, toolInfo); 
        }

        public void RemoveToolTip(IntPtr toolTipId)
        { 
            NativeMethods.TOOLINFO_T toolInfo = new NativeMethods.TOOLINFO_T();
            toolInfo.cbSize = Marshal.SizeOf(toolInfo); 
            toolInfo.hwnd = dataGrid.Handle; 
            toolInfo.uId = toolTipId;
            UnsafeNativeMethods.SendMessage(new HandleRef(tipWindow, tipWindow.Handle), NativeMethods.TTM_DELTOOL, 0, toolInfo); 
        }

        // will destroy the tipWindow
        public void Destroy() 
        {
            Debug.Assert(tipWindow != null, "how can one destroy a null window"); 
            tipWindow.DestroyHandle(); 
            tipWindow = null;
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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