Re: Here's my code so far - C# Discussion Boards

leppie8-Jul-03 9:07

leppie

8-Jul-03 9:07

C#
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leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

Making one user control aware of another

frogb0x8-Jul-03 7:57

frogb0x

8-Jul-03 7:57

Hello,

I have a problem that I'm still stuck on. I have a form with a pair of user controls. The first user control is displayed when the program runs. When a button is clicked, I want the first user control to remove itself from the form, and the second user control to appear.

However, when I write the code for the button, all I can do is get the first UC to disappear; the second UC never draws itself.

Someone earlier told me to instantiate an instance of the second user control in the form's constructor, and add this line into the form:

this.Parent.Controls.Add(newUserControl);

However, this still doesn't solve the issue of the first user control not knowing about the second user control. Can someone point me in the right direction?

Re: Making one user control aware of another

leppie8-Jul-03 8:34

leppie

8-Jul-03 8:34

public class Form1 : System.Windows.Forms.Form
{
  private System.Windows.Forms.Button button1;
  private System.Windows.Forms.Button button2;

  private System.ComponentModel.Container components = null;

	public Form1()
	{
		InitializeComponent();
	}

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

	private void InitializeComponent()
	{
    this.button1 = new System.Windows.Forms.Button();
    this.button2 = new System.Windows.Forms.Button();
    this.SuspendLayout();

    this.button1.Location = new System.Drawing.Point(64, 112);
    this.button1.Name = "button1";
    this.button1.TabIndex = 0;
    this.button1.Text = "button1";
    this.button1.Click += new System.EventHandler(this.button1_Click);

    this.button2.Location = new System.Drawing.Point(160, 112);
    this.button2.Name = "button2";
    this.button2.TabIndex = 1;
    this.button2.Text = "button2";
    this.button2.Visible = false;
    this.button2.Click += new System.EventHandler(this.button2_Click);

    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(292, 273);
    this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                this.button2,
                                                                this.button1});
    this.Name = "Form1";
    this.Text = "Form1";
    this.ResumeLayout(false);

  }
	
	private void button1_Click(object sender, System.EventArgs e)
  {
    button2.Visible = true;
    button1.Visible = false;
  }

  private void button2_Click(object sender, System.EventArgs e)
  {
    button2.Visible = false;
    button1.Visible = true;
  }
}

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

Re: Making one user control aware of another

Not Active8-Jul-03 9:54

Not Active

8-Jul-03 9:54

How does this help answer the question? Where are the user controls?

Here's my code so far

frogb0x8-Jul-03 10:32

frogb0x

8-Jul-03 10:32

If it helps, here my code:

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace Copper
{

public class frmInit : System.Windows.Forms.Form
{
private System.Windows.Forms.PictureBox pictureBox1;
private Copper.UCInit ucInit1;
private System.ComponentModel.Container components = null;

public frmInit()
{

InitializeComponent();

UCCreate newPanel = new UCCreate();
newPanel.Location = new Point(376, 8);
newPanel.Size = new Size (280, 140);
this.Parent.Controls.Add(newPanel);

}

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

#region Windows Form Designer generated code

private void InitializeComponent()
{
System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(frmInit));
this.pictureBox1 = new System.Windows.Forms.PictureBox();
this.ucInit1 = new Copper.UCInit();
this.SuspendLayout();

this.pictureBox1.Image = ((System.Drawing.Image)(resources.GetObject("pictureBox1.Image")));
this.pictureBox1.Location = new System.Drawing.Point(0, 0);
this.pictureBox1.Name = "pictureBox1";
this.pictureBox1.Size = new System.Drawing.Size(375, 256);
this.pictureBox1.TabIndex = 0;
this.pictureBox1.TabStop = false;

//
// ucInit1
//

this.ucInit1.Location = new System.Drawing.Point(376, 8);
this.ucInit1.Name = "ucInit1";
this.ucInit1.Size = new System.Drawing.Size(280, 184);
this.ucInit1.TabIndex = 0;
this.ucInit1.Load += new System.EventHandler(this.ucInit1_Load);

//
// frmInit
//

this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(664, 197);
this.Controls.Add(this.ucInit1);
this.Controls.Add(this.pictureBox1);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
this.MaximizeBox = false;
this.Name = "frmInit";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "Mud Object Creator";
this.ResumeLayout(false);

}
#endregion

[STAThread]
static void Main()
{
Application.Run(new frmInit());
}

Then I have the first control, entitled UCInit. Here's the relevant portion of it:

private void btnQuit_Click(object sender, System.EventArgs e)
{
Application.Exit();
}

private void btnCreate_Click(object sender, System.EventArgs e)
{
this.Hide();
//Code to draw UCCreate, the second user control,
//should go here. This is the part I need
//help with. Any thoughts?
}

Re: Here's my code so far

leppie8-Jul-03 13:34

leppie

8-Jul-03 13:34

OK here's a quick and dirty way Smile | :)

Just make the button public.

Just add the following to the main form:

ucInit1.button.Clicked += new EventHandler(ShowUCCreate);

....

void ShowUCCreate(object sender, EventArgs e)
{
  UCCreate newPanel = new UCCreate();
  newPanel.Location = new Point(376, 8);
  newPanel.Size = new Size (280, 140);
  this.Parent.Controls.Add(newPanel);
}

You should get the idea. Once you understand events they make life alot easier.

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

Re: Here's my code so far

frogb0x8-Jul-03 13:35

frogb0x

8-Jul-03 13:35

I think that should work. Is there a good primer on Events and the EventHandler() method in general, somewhere?

Re: Here's my code so far

leppie8-Jul-03 14:05

leppie

8-Jul-03 14:05

frogb0x wrote:
Is there a good primer on Events and the EventHandler() method in general, somewhere?

The ones in MSDN are rather difficult to grasp. It took me quite a while to figure out what they are and why I need them.

To understand events you need to understand delegates. In fact an event is really just a very limited delegate.

A delegate (or function pointer) is basically a function/methods signature. WHat I mean by this is, is that it looks basically like a method but it has the delegate keyword. Think of this as a placeholder for a method.

Example:

delegate void FooHandler(string name);

class ABC
{
  public FooHandler Foo;

  public void InvokeFoo()
  {
    Foo("Hello from ABC");
  }
}

class XYZ
{
  static void MyFoo(string name)
  {
    Console.WriteLine(name);
  }

  static void Main()
  {
    ABC abc = new ABC();
    abc.Foo = new FooHandler(MyFoo);
    abc.InvokeFoo();
  }
}

Now step into this with the debugger, step into every function (F11). This will show you exactly how it works. This allows you specify a method in a different place or you can change them dynamically.

Once you have grasped this, I suggest you look at the MSDN documentation on events.

Hope this helps Smile | :)

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

Setting form location

mcgahanfl8-Jul-03 7:32

mcgahanfl

8-Jul-03 7:32

A C# windows application consist of two forms. Form1 and Form2. How can I offset Form2 just a little from Form1's starting location. (So it looks like two playing cards, one not quite covering the other.)

public Form2(Form1 myParentForm)
{ //form 2 is created referencing form 1
InitializeCommonConstructor();
m_myParentForm = myParentForm;
}

private void button1_Click(object sender, System.EventArgs e)
{ //move form2 over a little bit.

if(m_myParentForm != null)
{
int x = m_myParentForm.Location.X;
int y = m_myParentForm.Location.Y;
this.Location.Offset(x + 50, y + 50);
}

Big Grin | :-D

Re: Setting form location

dynamic8-Jul-03 9:40

dynamic

8-Jul-03 9:40

C#:

<font color="#0000FF">private</font> <font color="blue">void</font><font color="blue"></font> button2_Click(<font color="#0000FF">object</font> sender,<font color="blue"></font> System.EventArgs e) <br> 	{ <br> 		Form2 frm=<font color="#0000FF">new</font> Form2(<font color="blue"></font><font color="blue"></font>); <br> 		<font color="#0000FF">int</font> x=<font color="#0000FF">this</font>.Location.X; <br> 		<font color="#0000FF">int</font> y=<font color="#0000FF">this</font>.Location.Y; <br> 		frm.Show(<font color="blue"></font><font color="blue"></font>); <br> 		frm.Location=<font color="#0000FF">new</font> Point(x-10,y-10); <font color="DarkGreen">// offset Form2 by 10 pixels X and Y from Form1 <br></font><br> 	} <br>

hope it helps Smile | :)

Vb:

<font color="blue">Public Function</font> TwinsOnWay(<font color="blue">ByVal</font> twins <font color="blue">As String</font>) <font color="blue">As String <br>     Select Case</font> twins<br>         <font color="blue">Case</font> "Gender" <br>             <font color="blue">Return</font> "Two Girls" <br>     <font color="blue">End Select <br> End Function</font> <br>

Re: Setting form location

mcgahanfl8-Jul-03 10:08

mcgahanfl

8-Jul-03 10:08

thank you that does help.

It is odd to me that the calling class sets the location and not the class itself. Seems very non OOP.

thanks again

Create Image With Text

Werdna8-Jul-03 6:54

Werdna

8-Jul-03 6:54

I need to dynamically generate image and put some text on it.
The problem I'm having is that the text needs to be as if it was on a sphere.

Imagine 400x400 pixel ball and write some text on it. It will look different at top and bottom and right and left sides will be vanishing.

Can it be done thru matrix transoform? if so how would i set one up?
Thanks.

RichTextBox: How to get the count of tabs in a TextLine

STW8-Jul-03 6:17

STW

8-Jul-03 6:17

I wrote a simple dBase Program Editor for Program Files.
Now I wanted to add the following functionnality:

IF X=0
DO XPRG
ENDI

--->

IF X=0
DO XPRG
ENDI

For this method I need the count of tabs in a line (because of reloading, when tabs already are set).
The Problem is that Line.IndexOf("\t") does not return the right value (RichTextBox always find this value and never returns -1).

So how is it possible to determine how much tabs are in a StringLine? Or is there another way to solve this problem?

Thanks.

Stefan

Re: RichTextBox: How to get the count of tabs in a TextLine

dynamic8-Jul-03 9:25

dynamic

8-Jul-03 9:25

C#:

private <font color="blue">void</font><font color="blue"></font> Form1_Load(object sender,<font color="blue"></font> System.EventArgs e) <br> 	{ <br> 		richTextBox1.AppendText("some\ttext\twith\ttabs\tin\tthere"); <font color="#006400">/// 5 tabs in a line.</font> <br> 	} <br> <font color="blue"></font><font color="blue"></font> <br> private <font color="blue">void</font><font color="blue"></font> button1_Click(object sender,<font color="blue"></font> System.EventArgs e) <br> 	{ <br> 		MessageBox.Show(richTextBox1.Lines[0].Split('\t').GetUpperBound(0).ToString(<font color="blue"></font>));<font color="DarkGreen"> // 0 is the first line in the richtextbox, upperbound is the count of tabs. <br></font><br> 	} <br>

hope that helps Smile | :)

Vb:

<font color="blue">Public Function</font> TwinsOnWay(<font color="blue">ByVal</font> twins <font color="blue">As String</font>) <font color="blue">As String <br>     Select Case</font> twins<br>         <font color="blue">Case</font> "Gender" <br>             <font color="blue">Return</font> "Two Girls" <br>     <font color="blue">End Select <br> End Function</font> <br>

Re: RichTextBox: How to get the count of tabs in a TextLine

STW8-Jul-03 10:43

STW

8-Jul-03 10:43

Thanks a lot for this idea!
Stefan

Changing listview icons?

Manster8-Jul-03 4:57

Manster

8-Jul-03 4:57

All,
Does anyone know how to change the icon/bitmap in a listview on a windows form? The first subitem in my listview is an icon and I want to change it based on the value of another subitem.

For example: I've got a negative value in the second subitem, I want the first subitem icon/bitmap to be a down arrow. Conversely if the second subitem is positive I want to the first subitem icon/bitmap to be an up arrow.

I think changing this at runtime might be easier?

Thanks Wink | ;)

Bounds Checker in C# / .NET

NKH8-Jul-03 4:23

NKH

8-Jul-03 4:23

Hi there,

Could someone confirm that Bounds Checker works and will give me information on memory leaks and CPU resource problems?

Thanks

Re: Bounds Checker in C# / .NET

leppie8-Jul-03 7:41

leppie

8-Jul-03 7:41

NKH wrote:
Could someone confirm that Bounds Checker works and will give me information on memory leaks and CPU resource problems?

I very much doubt that.

leppie ::AllocCPArticle(Generic DFA State Machine for .NET);

Re: Bounds Checker in C# / .NET

Kant8-Jul-03 16:40

Kant

8-Jul-03 16:40

leppie wrote:
I very much doubt that.

I have a question in this regard.

What's the future for companies like NuMega (Bounds Checker) in the .NET world?

"...if you don't want to hear things that piss you off don't piss off other people. SIMPLE." - Steven Hicks
This signature was created by "Code Project Quoter".

Re: Bounds Checker in C# / .NET

Daniel Turini9-Jul-03 4:14

Daniel Turini

9-Jul-03 4:14

Kant wrote:
What's the future for companies like NuMega (Bounds Checker) in the .NET world?
Maybe like this[^]

ORACLE One Real A$#h%le Called Lary Ellison

Re: Bounds Checker in C# / .NET

James T. Johnson9-Jul-03 6:14

James T. Johnson

9-Jul-03 6:14

Kant wrote:
What's the future for companies like NuMega (Bounds Checker) in the .NET world?

Maybe products that ensure that scarce resources are disposed of properly. Stuff like GDI+ objects, DB connections, Files, etc. All could possibly impact system performance if not handled correctly.

James

"I despise the city and much prefer being where a traffic jam means a line-up at McDonald's"
Me when telling a friend why I wouldn't want to live with him

closing an open form

.gonad8-Jul-03 4:08

.gonad

8-Jul-03 4:08

i have a treeview control with about 20 subnodes. each time i click on a new node, a related form opens in the parent window. how can i close the currently opened form once a new node is selected in the treeview control?

thanks for your help.

Smile | :)

Re: closing an open form

zuhx8-Jul-03 10:29

zuhx

8-Jul-03 10:29

First you will need to grab a reference to the parent window and the active window. Then you can close the active window. What I did was set a reference to the parent window in a var. Then I was able to call the variable and get the ActiveMdiChild property and set that property to close. So I have something like this

if (parent.ActiveMdiChild != null)
{
parent.ActiveMdiChild.Close();
}

Re: closing an open form

.gonad8-Jul-03 15:46

.gonad

8-Jul-03 15:46

thank you for your help. it worked exactly like you said. Smile | :)

Updating a data table

totig8-Jul-03 1:03

totig

8-Jul-03 1:03

Below is the code I am trying to use. I am trying to update a row in the datatable. The test2 just points at which row it should update. The error I get tells me I am trying to create a duplicate key. I understand that, but I cant figure out anyother way to update the database. On other tests, the dataTable updates perfectly, however the DataAdapter does not update the database. Please help me if you can.

DataRow newRow = categoryDataTable.NewRow();
newRow["catCategoryID"] = test2;
newRow["catCategoryName"] = catTextBox1.Text;
categoryDataTable.Rows.Add(newRow);
categoryDataTable.AcceptChanges();
categoryDataAdapter.Update(categoryDataTable);

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