Hi abhishek,
Sorry for keeping you waiting, I forwarded your question to our developer
team and got the follow reply:
<cite>
Whether WM_SETREDRAW causes a mousemove is up to the window. Some windows
let USER32 do default redraw handling, which will generate a mousemove on
enable. Listbox has custom redraw code which avoids the mousemove. You
simply shouldn't care one way or the other.
</cite>
So it up to the internal implementation, for why the default redraw will
cause the WM_MOUSEMOVE, here is an blog which may answer your question:
http://blogs.gotdotnet.com/raymondc/PermaLink.aspx/d8afd9b1-06ec-4046-939d-d
dc4d7662ec2
Thanks!
Best regards,
Ying-Shen Yu [MSFT]
Microsoft Online Partner Support
Get Secure! -
www.microsoft.com/security
This posting is provided "AS IS" with no warranties and confers no rights.
You should not reply this mail directly, "Online" should be removed before
sending, Thanks!
--------------------
| From: "abhishek ghuwalewala" <
[email protected]>
| References: <uV#
[email protected]>
<
[email protected]>
<#
[email protected]>
<Km#
[email protected]>
<O8N#
[email protected]>
<
[email protected]>
| Subject: Re: BeginUpdate/EndUpdate causing mouse move
| Date: Wed, 29 Oct 2003 15:20:12 -0600
| Lines: 424
| X-Priority: 3
| X-MSMail-Priority: Normal
| X-Newsreader: Microsoft Outlook Express 6.00.2800.1158
| X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
| Message-ID: <
[email protected]>
| Newsgroups: microsoft.public.dotnet.framework.windowsforms
| NNTP-Posting-Host: client-78-96.natinst.com 130.164.78.96
| Path: cpmsftngxa06.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP10.phx.gbl
| Xref: cpmsftngxa06.phx.gbl
microsoft.public.dotnet.framework.windowsforms:55468
| X-Tomcat-NG: microsoft.public.dotnet.framework.windowsforms
|
| I am still looking for an answer as to why the reported behavior does not
| reproduce on a ListBox control. What is it doing differently?
|
| Abhishek
|
| | > Hi abhishek,
| > In fact, this issue also occurred in native win32 application, it by
| design.
| > The system sometimes delivers a WM_MOUSEMOVE message even if the mouse
| > hasn't moved. Programs which are sensitive to physical mouse movement
| (such
| > as screen savers) should compare the coordinates in the WM_MOUSEMOVE
| > message with the coordinates from the previous mouse message and ignore
| the
| > message if they are the same.
| >
| > The Document didn't make this clear, we already noticed this problem, it
| > mightbe fixed in the next release of the document.Thanks for your
| reporting.
| > If you need handle the real OnMouseMove event you need first check if
the
| > point of the cursor is same as the previous one. the code should be
| > executed only when the values are different.
| > Thanks!
| >
| > Best regards,
| >
| > Ying-Shen Yu [MSFT]
| > Microsoft Online Partner Support
| > Get Secure! -
www.microsoft.com/security
| >
| > This posting is provided "AS IS" with no warranties and confers no
rights.
| > You should not reply this mail directly, "Online" should be removed
before
| > sending, Thanks!
| >
| > --------------------
| > | From: "abhishek ghuwalewala" <
[email protected]>
| > | References: <uV#
[email protected]>
| > <
[email protected]>
| > <#
[email protected]>
| > <Km#
[email protected]>
| > | Subject: Re: BeginUpdate/EndUpdate causing mouse move
| > | Date: Mon, 27 Oct 2003 10:29:09 -0600
| > | Lines: 348
| > | X-Priority: 3
| > | X-MSMail-Priority: Normal
| > | X-Newsreader: Microsoft Outlook Express 6.00.2800.1158
| > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
| > | Message-ID: <O8N#
[email protected]>
| > | Newsgroups: microsoft.public.dotnet.framework.windowsforms
| > | NNTP-Posting-Host: client-79-20.natinst.com 130.164.79.20
| > | Path: cpmsftngxa06.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP12.phx.gbl
| > | Xref: cpmsftngxa06.phx.gbl
| > microsoft.public.dotnet.framework.windowsforms:55305
| > | X-Tomcat-NG: microsoft.public.dotnet.framework.windowsforms
| > |
| > | As I had mentioned before, this behavior does not reproduce for the
| > ListBox
| > | control. Would you happen to know what the ListBox control is doing
that
| > | prevents this from happening?
| > |
| > | Abhishek
| > |
| > | | > | > Hi abhishek,
| > | > Thanks for your sample, I reproed your problem now.
| > | > For now, I haven't found a way to prevent MouseMove method to be
| called.
| > | > However, since BeginUpdate/Endupate is called by yourself, could you
| > add a
| > | > boolean flag before actually executing your codes in the MouseMove?
| > | > such as
| > | > InUpdating = false;
| > | > void BeginUpdate()
| > | > {
| > | > InUpdating = true;
| > | > SendMessage ....
| > | > }
| > | > void EndUpdate()
| > | > {
| > | > SendMessage() ...
| > | > InUpdating = false;
| > | > }
| > | > void MouseMove( ....)
| > | > {
| > | > if(!IsUpdating)
| > | > {
| > | > DoMouseMove();
| > | > }
| > | > }
| > | >
| > | > Does this work around solve your problem?
| > | > Please be free to post on the group, if you still have problem on
this
| > | > issue.
| > | > Thanks!
| > | >
| > | > Best regards,
| > | >
| > | > Ying-Shen Yu [MSFT]
| > | > Microsoft Online Partner Support
| > | > Get Secure! -
www.microsoft.com/security
| > | >
| > | > This posting is provided "AS IS" with no warranties and confers no
| > rights.
| > | > You should not reply this mail directly, "Online" should be removed
| > before
| > | > sending, Thanks!
| > | >
| > | > --------------------
| > | > | From: "abhishek ghuwalewala" <
[email protected]>
| > | > | References: <uV#
[email protected]>
| > | > <
[email protected]>
| > | > | Subject: Re: BeginUpdate/EndUpdate causing mouse move
| > | > | Date: Fri, 24 Oct 2003 11:05:22 -0500
| > | > | Lines: 638
| > | > | X-Priority: 3
| > | > | X-MSMail-Priority: Normal
| > | > | X-Newsreader: Microsoft Outlook Express 6.00.2800.1158
| > | > | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
| > | > | Message-ID: <#
[email protected]>
| > | > | Newsgroups: microsoft.public.dotnet.framework.windowsforms
| > | > | NNTP-Posting-Host: client-64-158.natinst.com 130.164.64.158
| > | > | Path:
| > | >
| > |
| >
|
cpmsftngxa06.phx.gbl!cpmsftngxa09.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP11.
| > | > phx.gbl
| > | > | Xref: cpmsftngxa06.phx.gbl
| > | > microsoft.public.dotnet.framework.windowsforms:55191
| > | > | X-Tomcat-NG: microsoft.public.dotnet.framework.windowsforms
| > | > |
| > | > | Ying-Shen,
| > | > |
| > | > | Thanks for your prompt reply. I am attaching a small sample
project
| > that
| > | > | reproduces the problem. The instructions for reproducing the
problem
| > are
| > | > | described in the application.
| > | > |
| > | > | Thanks,
| > | > | Abhishek
| > | > |
| > | > | | > | > | > Hi abhishek.
| > | > | > Thanks for your post!
| > | > | > You mean your mousemove event of your control or your form is
| fired
| > | when
| > | > | > you invoke the P/Invoke SendMessage
| > | > | > method?
| > | > | > I made a small program and tried to repro your problem, however
I
| > | didn't
| > | > | > get any mouse move event on the user control or on the Form when
| > | > invoking
| > | > | > these two methods.
| > | > | > I pasted my test code after the signature, you may try it on
your
| > | > system.
| > | > | > Probably it will be helpful if you could give me a
| > | > | > small sample project to repro this problem.
| > | > | >
| > | > | > Thanks for using MSDN Newsgroup!!
| > | > | >
| > | > | > Best regards,
| > | > | >
| > | > | > Ying-Shen Yu [MSFT]
| > | > | > Microsoft Online Partner Support
| > | > | > Get Secure! -
www.microsoft.com/security
| > | > | >
| > | > | > This posting is provided "AS IS" with no warranties and confers
no
| > | > rights.
| > | > | > You should not reply this mail directly, "Online" should be
| removed
| > | > before
| > | > | > sending, Thanks!
| > | > | >
| > | > | > <code file="MyUserControl.cs">
| > | > | > using System;
| > | > | > using System.Collections;
| > | > | > using System.ComponentModel;
| > | > | > using System.Drawing;
| > | > | > using System.Data;
| > | > | > using System.Windows.Forms;
| > | > | > using System.Runtime.InteropServices;
| > | > | >
| > | > | > namespace WinForm_BeginEndUpdate_MouseMove
| > | > | > {
| > | > | > /// <summary>
| > | > | > /// Summary description for MyUserControl.
| > | > | > /// </summary>
| > | > | > public class MyUserControl : System.Windows.Forms.UserControl
| > | > | > {
| > | > | > /// <summary>
| > | > | > /// Required designer variable.
| > | > | > /// </summary>
| > | > | > private System.ComponentModel.Container components = null;
| > | > | >
| > | > | > public MyUserControl()
| > | > | > {
| > | > | > // This call is required by the Windows.Forms Form Designer.
| > | > | > InitializeComponent();
| > | > | >
| > | > | > // TODO: Add any initialization after the InitializeComponent
call
| > | > | >
| > | > | > }
| > | > | >
| > | > | > /// <summary>
| > | > | > /// Clean up any resources being used.
| > | > | > /// </summary>
| > | > | > protected override void Dispose( bool disposing )
| > | > | > {
| > | > | > if( disposing )
| > | > | > {
| > | > | > if(components != null)
| > | > | > {
| > | > | > components.Dispose();
| > | > | > }
| > | > | > }
| > | > | > base.Dispose( disposing );
| > | > | > }
| > | > | >
| > | > | > #region Component Designer generated code
| > | > | > /// <summary>
| > | > | > /// Required method for Designer support - do not modify
| > | > | > /// the contents of this method with the code editor.
| > | > | > /// </summary>
| > | > | > private void InitializeComponent()
| > | > | > {
| > | > | > //
| > | > | > // MyUserControl
| > | > | > //
| > | > | > this.BackColor = System.Drawing.SystemColors.Desktop;
| > | > | > this.Name = "MyUserControl";
| > | > | > this.Size = new System.Drawing.Size(368, 424);
| > | > | >
| > | > | > }
| > | > | > #endregion
| > | > | >
| > | > | > private class NativeMethods
| > | > | > {
| > | > | > [DllImport("user32.dll")]
| > | > | > private extern static int SendMessage(IntPtr hwnd, uint nMsg,
| > | > | > int wParam, int lParam);
| > | > | > private const int WM_SETREDRAW = 0x000B;
| > | > | > public static void BeginUpdate(IntPtr hwnd)
| > | > | > {
| > | > | > SendMessage(hwnd,WM_SETREDRAW,0,0);
| > | > | > }
| > | > | > public static void EndUpdate(IntPtr hwnd)
| > | > | > {
| > | > | > SendMessage(hwnd,WM_SETREDRAW,-1,0);
| > | > | > }
| > | > | >
| > | > | > }
| > | > | >
| > | > | >
| > | > | > public void BeginUpdate()
| > | > | > {
| > | > | > NativeMethods.BeginUpdate(Handle);
| > | > | > }
| > | > | > public void EndUpdate()
| > | > | > {
| > | > | > NativeMethods.EndUpdate(Handle);
| > | > | > }
| > | > | >
| > | > | >
| > | > | > protected override void OnMouseMove(MouseEventArgs e)
| > | > | > {
| > | > | > base.OnMouseMove (e);
| > | > | > System.Diagnostics.Debug.WriteLine("MouseMove received");
| > | > | > }
| > | > | > public void DoUpdate()
| > | > | > {
| > | > | > Graphics g = CreateGraphics();
| > | > | > g.FillRectangle(Brushes.Indigo,this.Bounds);
| > | > | > g.Dispose();
| > | > | > }
| > | > | > }
| > | > | > }
| > | > | > </code>
| > | > | > <code file="Form1.cs">
| > | > | > using System;
| > | > | > using System.Drawing;
| > | > | > using System.Collections;
| > | > | > using System.ComponentModel;
| > | > | > using System.Windows.Forms;
| > | > | > using System.Data;
| > | > | >
| > | > | > namespace WinForm_BeginEndUpdate_MouseMove
| > | > | > {
| > | > | > /// <summary>
| > | > | > /// Summary description for Form1.
| > | > | > /// </summary>
| > | > | > public class Form1 : System.Windows.Forms.Form
| > | > | > {
| > | > | > private WinForm_BeginEndUpdate_MouseMove.MyUserControl
| > myUserControl1;
| > | > | > private System.Timers.Timer timer1;
| > | > | > /// <summary>
| > | > | > /// Required designer variable.
| > | > | > /// </summary>
| > | > | > private System.ComponentModel.Container components = null;
| > | > | >
| > | > | > public Form1()
| > | > | > {
| > | > | > //
| > | > | > // Required for Windows Form Designer support
| > | > | > //
| > | > | > InitializeComponent();
| > | > | >
| > | > | > //
| > | > | > // TODO: Add any constructor code after InitializeComponent call
| > | > | > //
| > | > | > }
| > | > | >
| > | > | > /// <summary>
| > | > | > /// Clean up any resources being used.
| > | > | > /// </summary>
| > | > | > protected override void Dispose( bool disposing )
| > | > | > {
| > | > | > if( disposing )
| > | > | > {
| > | > | > if (components != null)
| > | > | > {
| > | > | > components.Dispose();
| > | > | > }
| > | > | > }
| > | > | > base.Dispose( disposing );
| > | > | > }
| > | > | >
| > | > | > #region Windows Form Designer generated code
| > | > | > /// <summary>
| > | > | > /// Required method for Designer support - do not modify
| > | > | > /// the contents of this method with the code editor.
| > | > | > /// </summary>
| > | > | > private void InitializeComponent()
| > | > | > {
| > | > | > this.myUserControl1 = new
| > | > | > WinForm_BeginEndUpdate_MouseMove.MyUserControl();
| > | > | > this.timer1 = new System.Timers.Timer();
| > | > | >
| > ((System.ComponentModel.ISupportInitialize)(this.timer1)).BeginInit();
| > | > | > this.SuspendLayout();
| > | > | > //
| > | > | > // myUserControl1
| > | > | > //
| > | > | > this.myUserControl1.BackColor =
| System.Drawing.SystemColors.Desktop;
| > | > | > this.myUserControl1.Location = new System.Drawing.Point(72, 64);
| > | > | > this.myUserControl1.Name = "myUserControl1";
| > | > | > this.myUserControl1.Size = new System.Drawing.Size(256, 240);
| > | > | > this.myUserControl1.TabIndex = 2;
| > | > | > //
| > | > | > // timer1
| > | > | > //
| > | > | > this.timer1.Enabled = true;
| > | > | > this.timer1.Interval = 500;
| > | > | > this.timer1.SynchronizingObject = this;
| > | > | > this.timer1.Elapsed += new
| > | > | > System.Timers.ElapsedEventHandler(this.timer1_Elapsed);
| > | > | > //
| > | > | > // Form1
| > | > | > //
| > | > | > this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
| > | > | > this.ClientSize = new System.Drawing.Size(408, 421);
| > | > | > this.Controls.Add(this.myUserControl1);
| > | > | > this.Name = "Form1";
| > | > | > this.Text = "Form1";
| > | > | > this.MouseMove += new
| > | > | > System.Windows.Forms.MouseEventHandler(this.Form1_MouseMove);
| > | > | >
| ((System.ComponentModel.ISupportInitialize)(this.timer1)).EndInit();
| > | > | > this.ResumeLayout(false);
| > | > | >
| > | > | > }
| > | > | > #endregion
| > | > | >
| > | > | > /// <summary>
| > | > | > /// The main entry point for the application.
| > | > | > /// </summary>
| > | > | > [STAThread]
| > | > | > static void Main()
| > | > | > {
| > | > | > Application.Run(new Form1());
| > | > | > }
| > | > | >
| > | > | > private void Form1_MouseMove(object sender,
| > | > | > System.Windows.Forms.MouseEventArgs e)
| > | > | > {
| > | > | > System.Diagnostics.Debug.WriteLine("MainForm MouseMove
received");
| > | > | > }
| > | > | >
| > | > | > private void timer1_Elapsed(object sender,
| > | > System.Timers.ElapsedEventArgs
| > | > | > e)
| > | > | > {
| > | > | > myUserControl1.BeginUpdate();
| > | > | > System.Diagnostics.Debug.WriteLine("BeginUpdate");
| > | > | > myUserControl1.DoUpdate();
| > | > | > myUserControl1.EndUpdate();
| > | > | > System.Diagnostics.Debug.WriteLine("EndUpdate");
| > | > | >
| > | > | > }
| > | > | > }
| > | > | > }
| > | > | >
| > | > | > </code>
| > | > | >
| > | > | >
| > | > | >
| > | > | >
| > | > |
| > | > |
| > | > |
| > | >
| > |
| > |
| > |
| >
|
|
|
