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POAnimateWindow API transparency problem with RichTextBox
 

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    <p>I'm using the <code>AnimateWindow</code> API to show or hide a <code>Form</code> with a slide animation. The problem is that if the Form contains a <code>RichTextBox</code> control, it doesn't display this control correctly. It's transparent and doesn't show any text.</p> <p>After the animation is complete, double clicking somewhere in the control will reveal lines of text.</p> <p>I've created a full sample that anyone can use to compile and test themselves. There's no better way to debug this, unless you already know the answer.</p> <p>There's 2 buttons in the main form, one to show another form and the other to hide that same form. I've added both the <code>RichTextBox</code> as a simple <code>TextBox</code>. As you'll see, the problem only happens on the <code>RichTextBox</code>.</p> <pre><code>using System; using System.Drawing; using System.Runtime.InteropServices; using System.Windows.Forms; namespace WindowsFormsApplication1 { static class Program { public const int AW_ACTIVATE = 0x00020000; public const int AW_HIDE = 0x00010000; public const int AW_HOR_NEGATIVE = 0x00000002; public const int AW_HOR_POSITIVE = 0x00000001; public const int AW_SLIDE = 0x00040000; [DllImport("user32")] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool AnimateWindow(IntPtr hWnd, int time, int awFlags); [STAThread] public static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1()); } } public class Form1 : Form { public Form form; public Form1() { InitializeComponent(); form = new Form2(); form.Show(); form.Hide(); } private void button1_Click(object sender, EventArgs e) { form.Location = new Point(Location.X, Location.Y + form.Height + 100); Program.AnimateWindow(form.Handle, 1000, Program.AW_SLIDE | Program.AW_HOR_NEGATIVE | Program.AW_ACTIVATE); form.Show(); } private void button2_Click(object sender, EventArgs e) { Program.AnimateWindow(form.Handle, 1000, Program.AW_HIDE | Program.AW_HOR_POSITIVE); form.Hide(); } #region Windows Form Designer generated code private void InitializeComponent() { this.button1 = new System.Windows.Forms.Button(); this.button2 = new System.Windows.Forms.Button(); this.SuspendLayout(); this.button1.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0))); this.button1.Location = new System.Drawing.Point(11, 12); this.button1.Name = "button1"; this.button1.Size = new System.Drawing.Size(133, 114); this.button1.TabIndex = 0; this.button1.Text = "SHOW"; this.button1.UseVisualStyleBackColor = true; this.button1.Click += new System.EventHandler(this.button1_Click); this.button2.Font = new System.Drawing.Font("Microsoft Sans Serif", 14.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0))); this.button2.Location = new System.Drawing.Point(150, 12); this.button2.Name = "button2"; this.button2.Size = new System.Drawing.Size(133, 114); this.button2.TabIndex = 1; this.button2.Text = "HIDE"; this.button2.UseVisualStyleBackColor = true; this.button2.Click += new System.EventHandler(this.button2_Click); this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(294, 138); this.Controls.Add(this.button2); this.Controls.Add(this.button1); this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle; this.MaximizeBox = false; this.MinimizeBox = false; this.Name = "Form1"; this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen; this.Text = "Form1"; this.ResumeLayout(false); } #endregion private System.Windows.Forms.Button button1; private System.Windows.Forms.Button button2; } public class Form2 : Form { public Form2() { InitializeComponent(); } #region Windows Form Designer generated code private void InitializeComponent() { System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form2)); this.richTextBox1 = new System.Windows.Forms.RichTextBox(); this.textBox1 = new System.Windows.Forms.TextBox(); this.SuspendLayout(); this.richTextBox1.Dock = System.Windows.Forms.DockStyle.Top; this.richTextBox1.Location = new System.Drawing.Point(0, 0); this.richTextBox1.Name = "richTextBox1"; this.richTextBox1.Size = new System.Drawing.Size(240, 50); this.richTextBox1.TabIndex = 0; this.richTextBox1.Text = "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book."; this.textBox1.Dock = System.Windows.Forms.DockStyle.Bottom; this.textBox1.Location = new System.Drawing.Point(0, 57); this.textBox1.Multiline = true; this.textBox1.Name = "textBox1"; this.textBox1.ScrollBars = System.Windows.Forms.ScrollBars.Vertical; this.textBox1.Size = new System.Drawing.Size(240, 50); this.textBox1.TabIndex = 1; this.textBox1.Text = "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book."; this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(240, 107); this.ControlBox = false; this.Controls.Add(this.textBox1); this.Controls.Add(this.richTextBox1); this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle; this.Name = "Form2"; this.StartPosition = System.Windows.Forms.FormStartPosition.Manual; this.Text = "Form2"; this.ResumeLayout(false); this.PerformLayout(); } #endregion private System.Windows.Forms.RichTextBox richTextBox1; private System.Windows.Forms.TextBox textBox1; } } </code></pre> <p><strong>NOTE:</strong> I'm starting a bounty on this so if you're going to answer, please answer with a solution that works and not something for me to try and <em>see if it works</em>. Why? Because if people upvote your answer and doesn't fix anything , it will still be marked as accepted which it didn't help. Thanks for understanding.</p>
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    1. USRicardo Amaral
    1. USRicardo Amaral
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      1. USRicardo Amaral
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    1. COCan you clarify - where abouts are you double-clicking on the control?
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    2. COAnywhere in the RichTextBox, like when you double click to quickly select a word of text.
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      1. USRicardo Amaral
 

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