[Mono-bugs] [Bug 414166] New: UserControl.OnPaint(e.Graphics.Clip) not set if ControlStyles.OptimizedDoubleBuffer

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=414166


           Summary: UserControl.OnPaint(e.Graphics.Clip) not set if
                    ControlStyles.OptimizedDoubleBuffer
           Product: Mono: Class Libraries
           Version: 2.0
          Platform: Other
               URL: http://limada.sourceforge.net/Limaki/
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: lytico at users.sourceforge.net
         QAContact: mono-bugs at lists.ximian.com
          Found By: DeveloperNet


Description of Problem:

if you have an UserControl and set style to OptimizedDoubleBuffer:
on .NET you'll get the following result in OnPaint:
the Region e.Graphics.Clip is set to
Rectangle.Intersect(e.ClipRectangle,this.ClientRectangle)
on mono:
e.Graphics.Clip is infinite


Steps to reproduce the problem:
1. make a UserControl and set OptimizedDoubleBuffer:
2. override OnPaint and trace e.Graphics.ClipBounds


Actual Results:

Invalidate({X=5,Y=5,Width=500,Height=100})
OnPaint ()
this.ClientRectangle    {X=0,Y=0,Width=445,Height=262}
g.Clip.GetBounds(g)     {X=-4194304,Y=-4194304,Width=8388608,Height=8388608}
g.ClipBounds            {X=-4194304,Y=-4194304,Width=8388608,Height=8388608}
e.ClipRectangle         {X=5,Y=5,Width=440,Height=100}

Expected Results:

Invalidate({X=5,Y=5,Width=500,Height=100})
OnPaint ()
this.ClientRectangle    {X=0,Y=0,Width=445,Height=226}
g.Clip.GetBounds(g)     {X=5,Y=5,Width=440,Height=100}
g.ClipBounds            {X=5,Y=5,Width=440,Height=100}
e.ClipRectangle         {X=5,Y=5,Width=440,Height=100}

How often does this happen? 
always

Additional Information:

a workaround (or solution) could be:
. if OptimizedDoubleBuffer
e.Graphics.SetClip(Rectangle.Intersect(e.ClipRectangle,this.ClientRectangle))


Testcase:

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace MonoWinformTests {

    public class TestRegionAndOnPaint : UserControl {
        private Rectangle rect = Rectangle.Empty;

        public TestRegionAndOnPaint() {
            this.AutoScroll = true;
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

            ControlStyles controlStyle =
                ControlStyles.UserPaint
                | ControlStyles.AllPaintingInWmPaint
                // this enables graphics.Clip and graphics.ClipBounds:
                | ControlStyles.OptimizedDoubleBuffer;

            this.SetStyle(controlStyle, true);
        }

        protected override void OnPaint(PaintEventArgs e) {
            base.OnPaint(e);
            Graphics g = e.Graphics;
            Point pt = this.AutoScrollPosition;
            g.TranslateTransform(pt.X, pt.Y);
            if (rect != Rectangle.Empty) {

                g.FillRectangle(SystemBrushes.Window, rect);


            }



            string s = "OnPaint ()"+
                "\nthis.ClientRectangle\t" + this.ClientRectangle +
                "\ng.Clip.GetBounds(g)\t" + g.Clip.GetBounds(g) +
                "\ng.ClipBounds\t\t" + g.ClipBounds +
                "\ne.ClipRectangle\t\t" + e.ClipRectangle;

            // workaround:
            Region region = new Region();
            region.MakeInfinite();
            region.Intersect(
                    
Rectangle.Intersect(e.ClipRectangle,this.ClientRectangle));
            region.Translate(-pt.X, -pt.Y);

            s+=  "\nworkaround:\nregion.GetBounds(g)\t" + region.GetBounds(g);

            System.Console.WriteLine(s);

        }

        public void Execute() {
            rect.Location = new Point(5, 5);
            rect.Size = new Size(500, 100);
            this.AutoScrollMinSize = new Size(rect.Right, rect.Bottom);
            this.Invalidate(rect);
            System.Console.WriteLine("Invalidate("+rect+")");
        }
    }

    #region Test-Environment
    public class TestForm : Form {
        public TestForm() {
            InitializeComponent();
            testRegionAndOnPaint.Execute();

        }

        private void button1_Click(object sender, EventArgs e) {
            this.testRegionAndOnPaint.Execute();
        }

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


        private void InitializeComponent() {
            this.panel1 = new System.Windows.Forms.Panel();
            this.button1 = new System.Windows.Forms.Button();
            this.testRegionAndOnPaint = new
MonoWinformTests.TestRegionAndOnPaint();
            this.panel1.SuspendLayout();
            this.SuspendLayout();
            // 
            // panel1
            // 
            this.panel1.Controls.Add(this.button2);
            this.panel1.Controls.Add(this.button1);
            this.panel1.Dock = System.Windows.Forms.DockStyle.Left;
            this.panel1.Location = new System.Drawing.Point(0, 0);
            this.panel1.Name = "panel1";
            this.panel1.Size = new System.Drawing.Size(66, 266);
            this.panel1.TabIndex = 0;
            // 
            // button1
            // 
            this.button1.Dock = System.Windows.Forms.DockStyle.Top;
            this.button1.Location = new System.Drawing.Point(0, 0);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(66, 23);
            this.button1.TabIndex = 0;
            this.button1.Text = "Invalidate(rect)";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // testRegionAndOnPaint
            // 
            this.testRegionAndOnPaint.AutoScroll = true;
            this.testRegionAndOnPaint.Dock =
System.Windows.Forms.DockStyle.Fill;
            this.testRegionAndOnPaint.Location = new System.Drawing.Point(66,
0);
            this.testRegionAndOnPaint.Name = "testRegionAndOnPaint";
            this.testRegionAndOnPaint.Size = new System.Drawing.Size(300, 200);
            this.testRegionAndOnPaint.TabIndex = 1;
            // 
            // TestEnvironmentForm
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(400, 200);
            this.Controls.Add(this.testRegionAndOnPaint);
            this.Controls.Add(this.panel1);
            this.Name = "TestEnvironmentForm";
            this.Text = "Test AutoScroll";
            this.panel1.ResumeLayout(false);
            this.ResumeLayout(false);
        }

        private System.ComponentModel.IContainer components = null;
        private System.Windows.Forms.Panel panel1;
        private System.Windows.Forms.Button button2;
        private System.Windows.Forms.Button button1;
        private TestRegionAndOnPaint testRegionAndOnPaint;
    }

    static class TestProgram {
        [STAThread]
        static void Main() {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new TestForm());
        }
    }

    #endregion
}



cheers, 
lytico
on trying to get Limaki.WidgetDisplay to run on mono


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