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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