C# Discussion Boards - CodeProject

27-Sep-07 20:18

I have one button and one listbox on same Form.

Inside InitializeComponent()
{

For button1 I have
this.button1.Click += new System.EventHandler(this.Button1Click);

and for listBox1 I have
this.listBox1.KeyUp += new System.Windows.Forms.KeyEventHandler(this.ListBoxKeyUp);

}
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();

}

void Button1Click(object sender, EventArgs e)
{
Console.WriteLine("Btn Clicked");
this.listBox1.Focus();
}
void ListBoxKeyUp(Object sender, KeyEventArgs kev)
{
Console.WriteLine("List KeyUp");
// My Code to Handle the Key Up
}
}

On Running the App and Pressing Enter on button1
The Output is
Btn Clicked
List KeyUp

All I actually wanted was to give (in button1's Click Event) the Focus to listbox1 and return. My listbox is actually a playlist and whenver Enter is pressed on it the selected entry starts to play. Only one click (via Keyboard) was made on button1 but listbox1's KeyUp Event also is getting fired.

Please Advice
Thanks...

P.S. The Code Works fine if button1 is clicked via Mouse

Christian Graus27-Sep-07 20:19

Expected Scenario Explained

27-Sep-07 20:19

Well, what did you expect ? Here's the sequence:

1 - you press enter down. This clicks the default button. This gives the listbox the focus.
2 - you raise the enter key. The listbox has the focus, and so it fires.

Try handling keydown instead of keyup.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Sukhjinder_K27-Sep-07 20:57

27-Sep-07 20:57

Hmm. Right Christian. I think I've got a little confused here. The Results are supporting your view. Now If I handle KeyDown with listbox1 then it allows the user to keep the key pressed and the event will keep firing as long as the Key is down. I dont want that.

What is happening here is that the user is clicking the Button, the focus is shifting to listbox1 and a KeyEvent is being generated on listbox and my key handling code is getting executed. (Total KeyPresses 1)

What I really need is that the user should Press a Push Button (button1) and the Focus be transfered to my listbox1. Now if the User wants she may Press a Key (Enter) again to select an Item in listbox1. (Total Key Presses by user 2)

I think I've explained my problem clearly.

So what may be the proper way to achieve this.

Thanks...

Sukhjinder_K27-Sep-07 22:13

27-Sep-07 22:13

I think I've found the Way

<br />
void Button1Click(object sender, EventArgs e)<br />
{<br />
Console.WriteLine("Btn Clicked");<br />
Application.DoEvents();<br />
this.listBox1.Focus();<br />
Application.DoEvents();<br />
}<br />

Why??? Goto http://www.thescripts.com/forum/post1334126-2.html

Christian Graus27-Sep-07 22:30

27-Sep-07 22:30

I don't see how that makes any difference, unless you're now beating a race condition by flushing the event queue.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Sukhjinder_K27-Sep-07 22:54

Re: ListView Gridline color

27-Sep-07 22:54

I really dont have much Idea about that too. But my app has started to behave as was desired it to.

<br />
void clickHandler(---)<br />
{<br />
Application.DoEvents();<br />
<br />
// Here I replace the current Panel to show another Panel and moving Focus to a //list contained in the latter <br />
<br />
Application.DoEvents();<br />
}

Without the Former Application.DoEvents() my code was unaffected

Similar Issue

Yes I myself am not convinced and will try to find a better solution.

Your Thoughts Please...
Thanks...

ListView Gridline color

sibiks27-Sep-07 20:07

sibiks

27-Sep-07 20:07

I have one listview which is owner drawn. I have to change the grid line color. I tried this by making GridLines = false for listview and Draw the gridlines programatically. But if there are 100 items its flickering and a lot of painting issues

Sibi

dengboo27-Sep-07 20:11

dengboo

27-Sep-07 20:11

Where do you put the painting code?
Paste your code, or it's hard to resolve it.

---------------------------------
Believe what you saw!

Re: ListView Gridline color

sibiks27-Sep-07 20:17

sibiks

27-Sep-07 20:17

///

///
///

/// <param name="sender" />
/// <param name="e" />
private void TreeListView_DrawItem( object sender, DrawListViewItemEventArgs e )
{
Graphics g = e.Graphics;

TreeListViewItem item = ( TreeListViewItem )e.Item;

item.UpdateBounds();

this.DrawExpandMarker( g, item );
this.DrawCheckBox( g, item );

StringFormat sf = new StringFormat();

sf.LineAlignment = StringAlignment.Center;
sf.FormatFlags = StringFormatFlags.NoWrap;

SolidBrush foreBrush = new SolidBrush( this.ForeColor );

if( this.changeSelectionForeColor == true )
{
foreBrush = new SolidBrush( item.ForeColor );
}

SolidBrush fillBrush = new SolidBrush( item.BackColor );

Rectangle fillRect = e.Bounds;

fillRect.X = item.TextBounds.X;
fillRect.Width -= fillRect.X;

fillRect.Height -= 1;

if( item.Selected == true && item.ReadOnly == false && item.IsDummy == false )
{
selectedItem = item;
item.IsInvalidated = false;

foreBrush = new SolidBrush( SystemColors.HighlightText );

if( this.changeSelectionForeColor == true )
{
foreBrush = new SolidBrush( item.ForeColor );
}

fillBrush = new SolidBrush( SystemColors.Highlight );
}

g.FillRectangle( fillBrush, fillRect );

string text = this.GetAdjustedString( g, e.Item.Text, item.TextBounds, this.Font );

if( item.ReadOnly == false )
{
g.DrawString( text, this.Font, foreBrush, item.TextBounds, sf );
}

if( item.IsButtonNeeded == true )
{
SolidBrush buttonBrush = new SolidBrush( this.Parent.BackColor );

Rectangle buttonRect = item.ButtonBounds;

g.FillRectangle( buttonBrush, buttonRect );

Border3DStyle border = item.IsButtonPressed ? Border3DStyle.Adjust : Border3DStyle.RaisedInner;

ControlPaint.DrawBorder3D( g, buttonRect, border );

sf.Alignment = StringAlignment.Center;

this.Draw3DText( g, buttonRect, item.ButtonText, sf, item.IsButtonPressed );

buttonBrush.Dispose();
}

if( item.ReadOnly == true )
{
g.DrawString( text, this.Font, Brushes.Gray, item.TextBounds, sf );

Rectangle shadowRect = e.Bounds;

shadowRect.Width -= item.SymbolBounds.X - shadowRect.X;
shadowRect.X = item.SymbolBounds.X;

SolidBrush shadowBrush = new SolidBrush( Color.FromArgb( 60, Color.Gray ) );
g.FillRectangle( shadowBrush, shadowRect );

shadowBrush.Dispose();
}

sf.Dispose();

if( this.gridLines == true )
{
this.DrawGridLine( g, item );
}

fillBrush.Dispose();
foreBrush.Dispose();
}

///

///
///

/// <param name="g" />
private void DrawGridLine( Graphics g,TreeListViewItem item )
{
int dispHeight = this.DisplayRectangle.Height;
int itemHieght = item.TextBounds.Height;

int itemCount = ( dispHeight / itemHieght );

int yPos = itemHieght;

int width = this.Width;

Pen pen = new Pen( this.gridLineColor );

for( int index = 0; index < itemCount; ++index )
{
g.DrawLine(pen, new Point(0, yPos), new Point(width, yPos));

yPos += itemHieght;
}

if( this.Columns.Count == 0 )
{
return;
}

int xPos = 0;

ColumnHeader column = this.Columns[ 0 ];

xPos = column.Width;

for( int colIndex = 1; colIndex < this.Columns.Count; ++colIndex )
{
column = this.Columns[ colIndex ];

g.DrawLine(pen, new Point(xPos, 0), new Point(xPos, this.Height));
xPos += column.Width;
}

pen.Dispose();
}

What is the substitute of #define directive in C#?

Mushtaque Nizamani27-Sep-07 18:53

Mushtaque Nizamani

27-Sep-07 18:53

Can anyone please tell what is the substitute of #define directive in C#, actually i want to write equivalent following code of C++ in C# .

#define TOTALMONTHS 12<br />
CString strMonths[TOTALMONTHS];

Best Regards,
Mushq

Mushtaque Ahmed Nizamani
Software Engineer
Ultimus Pakistan

Re: What is the substitute of #define directive in C#?

Christian Graus27-Sep-07 18:56

Re: What is the substitute of #define directive in C#?

27-Sep-07 18:56

I believe this can be done, but why ? It's nasty in C++, and it's nasty in C#.

const int TOTALMONTHS = 12;
string[] strMonths = new string[TOTALMONTHS];

Why on earth would you anticipate ever changing how many months are in a year ? Or is it a co-incidence that total months = 12 ?

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Mushtaque Nizamani27-Sep-07 19:20

Mushtaque Nizamani

27-Sep-07 19:20

Christian Graus wrote:
const int TOTALMONTHS = 12;
string[] strMonths = new string[TOTALMONTHS];

Thanks for the answer.

Christian Graus wrote:
It's nasty in C++, and it's nasty in C#.

Why it's nasty?

Christian Graus wrote:
Why on earth would you anticipate ever changing how many months are in a year ? Or is it a co-incidence that total months = 12 ?

Can you please elaborate it more; I think that there are 12 months in an year that's why i took that particular example.

Best Regards,
Mushq

Mushtaque Ahmed Nizamani
Software Engineer
Ultimus Pakistan

Re: What is the substitute of #define directive in C#?

Christian Graus27-Sep-07 19:34