Re: two problems in windows form - C# Discussion Boards

Shy Agam21-Mar-07 7:42

Shy Agam

21-Mar-07 7:42

Are you painting the graph on the PictureBox?
If so, where is the painting code executed from?
Try using the form's Paint event in order to redraw the graph on the PictureBox.

Regards,
Shy.

ahmad al-omar21-Mar-07 8:51

ahmad al-omar

21-Mar-07 8:51

the graph made by mouse move this is the code below :

Graphics gy = pictureBox4.CreateGraphics();

gy.FillEllipse(new SolidBrush(Color.Blue),i,y_pos[i]+50,3,3);

thank you

ahmad al-omar

Shy Agam21-Mar-07 9:36

Shy Agam

21-Mar-07 9:36

When you paint something on a control you have to repaint it whenever the control repaints itself.
When you minimize the form and restore it, all of the controls on the form are automatically repainted.
However, any painting you made on the controls are not repainted.

Use the PictureBox.Paint event and place your code there in order to repaint the ellipse everytime the PictureBox repaints itself.

Regards,
Shy.

Sautin.net22-Mar-07 8:49

Sautin.net

22-Mar-07 8:49

On top of shyagam's response, anytime you can elimineate the Control.CreateGraphics() call in GDI+, do it. If you are working extensively in GDI+ this is a rule you should embrace. Thus, when you re-Maximized the control from wich the graphis being painted, it will automatically repaint the graph and when a value changes that will affect the graph you can simply call Invalidate() on the control that is painting the graph.

"All of us who served in one war or another know very well that all wars are the glory and the agony of the young."
Gerald Ford

PHP IDE

abalfazl21-Mar-07 4:25

abalfazl

21-Mar-07 4:25

Hello friends

I want to build a PHP IDE that anyone can write farsi or arabic easily as in frontpage or MS word,

I want o use C# for this,

what is the start point in order to build this IDE?

Which things I must learn?

Any one has idea about this subject?

Re: PHP IDE

joon _vh.21-Mar-07 5:06

joon _vh.

21-Mar-07 5:06

I think I would start by really boning up on Regular Expressions (google or CP-search) and other ways to parse text.

On the other side I would focus on getting to know as much as possible about PHP so you can define the boundaries of your project (if any Poke tongue | ;-P

Visual Studio can't evaluate this, can you?

public object moo<br />
        {<br />
__get { return moo; }<br />
__set { moo = value; }<br />
}

Undo and Redo in c#

hiremath7121-Mar-07 4:21

21-Mar-07 4:21

hi,
I am creating a editor in Richtextbox control.

and now i want to implement feature Undo and redo ..

I am not getting it.

pls help me

with regards
prasad Smile | :)

Re: Undo and Redo in c# [modified]

Bekjong21-Mar-07 4:32

Bekjong

21-Mar-07 4:32

Check out this recent code project article.

Standards are great! Everybody should have one!

joon _vh.21-Mar-07 4:33

joon _vh.

21-Mar-07 4:33

Here are some articles:

http://www.codeproject.com/useritems/useractionbasedundoredo.asp
http://www.codeproject.com/csharp/autoundoredo.asp

and this pattern looks promising too:

http://en.wikipedia.org/wiki/Memento_pattern

Although they will not be easy to implement with a RichTextBox I think.
A simple solution, that comes to my mind would be to save a copy of of the text when a change occurs. Then you can undo by replacing the current one with this copy. You should however limit the number of copies because it will consume a lot of memory when there is a lot of text.

Can you show us what you have thought of, or have tried already? Do you have a specific problem, or just no idea where to start?

I feel like a twat :p I didn't know RichTextbox has Undo/Redo functionality. Post your code, tell us what the problem is.

-- modified at 10:38 Wednesday 21st March, 2007

Visual Studio can't evaluate this, can you?

public object moo<br />
        {<br />
__get { return moo; }<br />
__set { moo = value; }<br />
}

hiremath7121-Mar-07 18:54

21-Mar-07 18:54

hi,

int ActiveUndoIndex = ActiveWindowStatus();
if (arrScrptDsgnrFrms[ActiveUndoIndex].RchtxtBx.CanUndo == true)
{
arrScrptDsgnrFrms[ActiveUndoIndex].RchtxtBx.Undo();
arrScrptDsgnrFrms[ActiveUndoIndex].RchtxtBx.ClearUndo();
}

this code is undoing the enitre actions not chracter by chracter ...

help me pls

Pete O'Hanlon21-Mar-07 4:34

Pete O'Hanlon

21-Mar-07 4:34

Before you try to Undo something, you need to check to see whether or not it can be undone. To do this, you need to call CanUndo and only call Undo if it returns true. Similar logic applies to Redo/CanRedo.

Deja View - the feeling that you've seen this post before.

hiremath7121-Mar-07 18:55

21-Mar-07 18:55

hi,
int ActiveUndoIndex = ActiveWindowStatus();
if (arrScrptDsgnrFrms[ActiveUndoIndex].RchtxtBx.CanUndo == true)
{
arrScrptDsgnrFrms[ActiveUndoIndex].RchtxtBx.Undo();
arrScrptDsgnrFrms[ActiveUndoIndex].RchtxtBx.ClearUndo();
}

this is undoing the entire operation
e.g if i enter 100 chracters
it is deleting 100 chracters at time for single undo..

JoeSharp21-Mar-07 4:34

JoeSharp

21-Mar-07 4:34

hi
The Richtextbox control have methodes for this issues
e.g. Copy(), Paste(), and properties like CanCopy or CanPaste

regards

Stefan Troschuetz21-Mar-07 4:35

Stefan Troschuetz

21-Mar-07 4:35

Search the articles for "undo" and/or "redo". There are some that cover this topic.

"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook

www.troschuetz.de

joon _vh.21-Mar-07 4:44

joon _vh.

21-Mar-07 4:44

I could only find an example in VB.

http://www.java2s.com/Code/VB/GUI/RichTextBoxReDoandUnDo.htm

this is my own mockup

private void button1_Click(object sender, EventArgs e)
{
    if(richTextBox1.CanUndo)
    {
        richTextBox1.Undo();
    }
}

// this is just to show the UndoActionName property...
private void richTextBox1_TextChanged(object sender, EventArgs e)
{
    button1.Text = richTextBox1.UndoActionName;
}

It seems to work fine here.

Visual Studio can't evaluate this, can you?

public object moo<br />
        {<br />
__get { return moo; }<br />
__set { moo = value; }<br />
}

hiremath7121-Mar-07 18:57