Tooltip disappears too fast in layered window

Similar Threads:

1.Tooltip disappears too fast in layered window

"Kellie Fitton" < XXXX@XXXXX.COM > wrote in message 
news: XXXX@XXXXX.COM ...
> Hi,
>
> Well, if USE_LAYERED_WINDOWS is defined, then dwExStyle should
> equals the window style WS_EX_LAYERED, otherWise dwExStyle will
> have a zero value initialize. Also, you could create the layered
> window directly withOut the conditional text (#ifdef....#endif),
> especially if you want to create a layered window, try this:
>
> CreateWindowEx(WS_EX_LAYERED, .............);
> UpdateLayeredWindow()
>

Thanks Kellie.  The USE_LAYERED_WINDOWS was a quick way of flipping the 
layered window style on and off to illustrate the problem only occurs with 
it turned on.


> According to microSoft, when creating a layered window, it is more
> efficient to use the API UpdateLayeredWindow(), especailly since the
> API SetWindowLayeredAttributes() uses more memory for its reDirection
> handling of a layered window, which tends to have a delay factor.
>

I'd love to use UpdateLayeredWindow(), especially since it supports 
per-pixel alpha transparency, and SetLayeredWindowAttributes() doesn't.  The 
trouble is, UpdateLayeredWindow() doesn't support the window having child 
windows in it.  The child windows aren't painted at all if you use 
UpdateLayeredWindow().  So if you want a layered window with child controls, 
you have no choice but to use SetLayeredwindowAttributes().

-- David

2.Tooltip on Combobox disappears - Windows Forms bug?

	I am using .NET 2.0 forms and running on Windows XP SP2.  When I have a 
tooltip on a combo box, and the combo box is expanded (ropped down 
using the arrow, it will no longer display it tooltip, no matter how 
long I hover.  Even if I move off the control and back it will still not 
display its tooltip.  If I then go to another control that has tootips, 
then back to the combobox, it will again display its tooltip, until the 
next time it is expanded.
	
	Below is a small sample that has this bug (on my machine anyway.) It is 
simply the standard VS8.0 generated code, condensed. Strangely, if I 
remove the EnableVisualStyles() line, then the tootips seem to work 
correctly.

	I could not find any information about this bug.  I am curious if 
anyone else has come across it, and if there is a solution?  Any help 
appreciated.


======= Buildable Code Sample Below

using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace ComboTest
{
     static class Program
     {
         [STAThread]
         static void Main()
         {
             Application.EnableVisualStyles();
             Application.Run(new Form1());
         }
     }

     class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         private System.ComponentModel.IContainer components = null;
         protected override void Dispose(bool disposing)
         {
             if (disposing && (components != null))
             {
                 components.Dispose();
             }
             base.Dispose(disposing);
         }

         private void InitializeComponent()
         {
             this.components = new System.ComponentModel.Container();
             this.comboBox1 = new System.Windows.Forms.ComboBox();
             this.toolTip1 = new 
System.Windows.Forms.ToolTip(this.components);
             this.button1 = new System.Windows.Forms.Button();
             this.SuspendLayout();
             // comboBox1
             this.comboBox1.DropDownStyle = 
System.Windows.Forms.ComboBoxStyle.DropDownList;
             this.comboBox1.FormattingEnabled = true;
             this.comboBox1.Location = new System.Drawing.Point(12, 59);
             this.comboBox1.Name = "comboBox1";
             this.comboBox1.Size = new System.Drawing.Size(121, 21);
             this.comboBox1.TabIndex = 0;
             this.toolTip1.SetToolTip(this.comboBox1, "Combo Tooltip");
             // button1
             this.button1.Location = new System.Drawing.Point(12, 12);
             this.button1.Name = "button1";
             this.button1.Size = new System.Drawing.Size(75, 23);
             this.button1.TabIndex = 1;
             this.button1.Text = "button1";
             this.toolTip1.SetToolTip(this.button1, "Button tip.");
             this.button1.UseVisualStyleBackColor = true;
             // Form1
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.ClientSize = new System.Drawing.Size(292, 266);
             this.Controls.Add(this.button1);
             this.Controls.Add(this.comboBox1);
             this.Name = "Form1";
             this.Text = "Form1";
             this.ResumeLayout(false);
         }
         private System.Windows.Forms.ComboBox comboBox1;
         private System.Windows.Forms.ToolTip toolTip1;
         private System.Windows.Forms.Button button1;
	}
}


====== END Code Sample