Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / PropertyGridInternal / GridToolTip.cs / 1 / GridToolTip.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Windows.Forms.PropertyGridInternal { using System.Runtime.Serialization.Formatters; using System.Runtime.InteropServices; using System.Runtime.Remoting; using System.Diagnostics; using System; using System.Collections; using System.Windows.Forms; using System.ComponentModel; using System.ComponentModel.Design; using System.IO; using System.Drawing; using Microsoft.Win32; using Message = System.Windows.Forms.Message; internal class GridToolTip : Control { Control[] controls; string toolTipText; NativeMethods.TOOLINFO_T[] toolInfos; bool dontShow; Point lastMouseMove = Point.Empty; private int maximumToolTipLength = 1000; internal GridToolTip(Control[] controls) { this.controls = controls; SetStyle(ControlStyles.UserPaint, false); this.Font = controls[0].Font; this.toolInfos = new NativeMethods.TOOLINFO_T[controls.Length]; for (int i = 0; i < controls.Length; i++) { controls[i].HandleCreated += new EventHandler(this.OnControlCreateHandle); controls[i].HandleDestroyed += new EventHandler(this.OnControlDestroyHandle); if (controls[i].IsHandleCreated) { SetupToolTip(controls[i]); } } } public string ToolTip{ get { return toolTipText; } set { if (this.IsHandleCreated || !String.IsNullOrEmpty(value)) { this.Reset(); } if (value != null && value.Length > maximumToolTipLength) { //Let the user know the text was truncated by throwing on an ellipsis value = value.Substring(0, maximumToolTipLength) + "..."; } this.toolTipText = value; if (this.IsHandleCreated) { bool visible = this.Visible; if (visible){ this.Visible = false; } // here's a hack. if we give // the tooltip an empty string, it won't come back // so we just force it hidden instead // if (value == null || value.Length == 0){ dontShow = true; value = ""; } else{ dontShow = false; } for (int i = 0; i < controls.Length; i++) { UnsafeNativeMethods.SendMessage(new HandleRef(this, Handle), NativeMethods.TTM_UPDATETIPTEXT, 0, GetTOOLINFO(controls[i])); } if (visible && !dontShow){ this.Visible = true; } } } } ////// /// The createParams to create the window. /// ///protected override CreateParams CreateParams { get { NativeMethods.INITCOMMONCONTROLSEX icc = new NativeMethods.INITCOMMONCONTROLSEX(); icc.dwICC = NativeMethods.ICC_TAB_CLASSES; SafeNativeMethods.InitCommonControlsEx(icc); CreateParams cp = new CreateParams(); cp.Parent = IntPtr.Zero; cp.ClassName = NativeMethods.TOOLTIPS_CLASS; cp.Style |= (NativeMethods.TTS_ALWAYSTIP | NativeMethods.TTS_NOPREFIX); cp.ExStyle = 0; cp.Caption = this.ToolTip; return cp; } } private NativeMethods.TOOLINFO_T GetTOOLINFO(Control c) { int index = Array.IndexOf(controls, c); Debug.Assert(index != -1, "Failed to find control in tooltip array"); if (toolInfos[index] == null){ toolInfos[index] = new NativeMethods.TOOLINFO_T(); toolInfos[index].cbSize = Marshal.SizeOf(typeof(NativeMethods.TOOLINFO_T)); toolInfos[index].uFlags |= NativeMethods.TTF_IDISHWND | NativeMethods.TTF_TRANSPARENT | NativeMethods.TTF_SUBCLASS; } toolInfos[index].lpszText = this.toolTipText; toolInfos[index].hwnd = c.Handle; toolInfos[index].uId = c.Handle; return toolInfos[index]; } /* private bool MouseMoved(Message msg){ bool moved = true; Point newMove = new Point(NativeMethods.Util.LOWORD(msg.LParam), NativeMethods.Util.HIWORD(msg.LParam)); // check if the mouse has actually moved... if (lastMouseMove == newMove){ moved = false; } lastMouseMove = newMove; return moved; } */ private void OnControlCreateHandle(object sender, EventArgs e){ SetupToolTip((Control)sender); } private void OnControlDestroyHandle(object sender, EventArgs e){ if (IsHandleCreated) { UnsafeNativeMethods.SendMessage(new HandleRef(this, Handle), NativeMethods.TTM_DELTOOL, 0, GetTOOLINFO((Control)sender)); } } protected override void OnHandleCreated(EventArgs e) { base.OnHandleCreated(e); for (int i = 0; i < controls.Length; i++) { if (controls[i].IsHandleCreated) { SetupToolTip(controls[i]); } } } private void SetupToolTip(Control c) { if (this.IsHandleCreated) { SafeNativeMethods.SetWindowPos(new HandleRef(this, Handle), NativeMethods.HWND_TOPMOST, 0, 0, 0, 0, NativeMethods.SWP_NOMOVE | NativeMethods.SWP_NOSIZE | NativeMethods.SWP_NOACTIVATE); if (0 == (int)UnsafeNativeMethods.SendMessage(new HandleRef(this, Handle), NativeMethods.TTM_ADDTOOL, 0, GetTOOLINFO(c))) { Debug.Fail("TTM_ADDTOOL failed for " + c.GetType().Name); } // Setting the max width has the added benefit of enabling multiline // tool tips! subhag 66503) // UnsafeNativeMethods.SendMessage(new HandleRef(this, Handle), NativeMethods.TTM_SETMAXTIPWIDTH, 0, SystemInformation.MaxWindowTrackSize.Width); } } public void Reset(){ // okay, this resets the tooltip state, // which can get broken when we leave the window // then reenter. So we set the tooltip to null, // update the text, then it back to what it was, so the tooltip // thinks it's back in the regular state again // string oldText = this.ToolTip; this.toolTipText = ""; for (int i = 0; i < controls.Length; i++) { if (0 == (int)UnsafeNativeMethods.SendMessage(new HandleRef(this, Handle), NativeMethods.TTM_UPDATETIPTEXT, 0, GetTOOLINFO(controls[i]))) { //Debug.Fail("TTM_UPDATETIPTEXT failed for " + controls[i].GetType().Name); } } this.toolTipText = oldText; this.SendMessage(NativeMethods.TTM_UPDATE, 0, 0); } protected override void WndProc(ref Message msg) { switch (msg.Msg) { case NativeMethods.WM_SHOWWINDOW: if ((int)msg.WParam != 0 && dontShow){ msg.WParam = IntPtr.Zero; } break; case NativeMethods.WM_NCHITTEST: // Fix for VSWhidbey#93985 and VSWhidbey#172903. When using v6 common controls, the native // tooltip does not end up returning HTTRANSPARENT all the time, so its TTF_TRANSPARENT // behavior does not work, ie. mouse events do not fall thru to controls underneath. This // is due to a combination of old app-specific hacks in comctl32, functional changes between // v5 and v6, and the specfic way the property grid drives its tooltip. Workaround is to just // force HTTRANSPARENT all the time. msg.Result = (IntPtr) NativeMethods.HTTRANSPARENT; return; } base.WndProc(ref msg); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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