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Thanks Luc. It is a kiosk app and I am actually in the process of finding some way to clamp down on what users can do (disable CTL-ALT-DEL, ALT-TAB, etc., remove task bar, ...)
In case anyone knows how to accomplish these, i would really appreciate a sample or pointing me to right direction.
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You should have said so right away. I have no experience with kiosk mode, but the topic pops up regularly around here; the best reply seems to be this one[^]. For more, use CodeProject's message search facility, or Google.
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I would like to have the grid automatically add a new row when the user presses "Tab" from the last cell in the last row of the grid.
I have set AllowUserAddRows property to "false"
Thanks,
Sri
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I think this should be simple. You need to capture the KeyPreview on dgv, check if there is a cell selected, then if it is the last cell,last row and then add a new column. Then set the selection to the first cell of the new row.
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i need help on usb drive. when a user inserts a usb drive, auto run starts and diplays some of the options to select from. what i want is to add my applications exe to the list of auto run when usb drive is inserted in usb port, so that i can select my application and do some aftermath. please help. simply i want usb drive to run my application when i insert it into my computer.
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you should pick one forum to ask your question.
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I am new to making custom windows forms control's and created a small component that can draw a grid.
The problem I am facing is when I scroll using the panels auto scroll features it seems to flicker and be displaced but what I am hoping for is a smooth transition across the x or y axis.
using System.Drawing;
using System.Windows.Forms;
namespace TileMapper.Presentation.Controls
{
public partial class MapRenderer : UserControl
{
private Point _tileBound;
private Point _rowsColumns;
private bool _initalized = false;
public MapRenderer()
{
InitializeComponent();
this.DoubleBuffered = true;
this.SetStyle(ControlStyles.DoubleBuffer |
ControlStyles.OptimizedDoubleBuffer |
ControlStyles.UserPaint |
ControlStyles.AllPaintingInWmPaint, true);
this.UpdateStyles();
}
public void InitalizeGrid(int tileWidth, int tileHeight, int rows, int columns)
{
_tileBound = new Point(tileWidth, tileHeight);
_rowsColumns = new Point(rows, columns);
panel1.AutoScrollMinSize = new Size(_tileBound.X * _rowsColumns.X, _tileBound.Y * _rowsColumns.Y);
_initalized = true;
_pen = new Pen(Color.Black);
_tile = new Rectangle(0, 0, _tileBound.X, _tileBound.Y);
}
Pen _pen;
Rectangle _tile;
void DrawGrid(Graphics e)
{
Image im = Image.FromFile(@"H:\My Pictures/tile.png");
for (int x = 0; x < _rowsColumns.X; x++)
{
for (int y = 0; y < _rowsColumns.Y; y++)
{
Rectangle rec = new Rectangle(x * _tileBound.X - panel1.HorizontalScroll.Value
, y * _tileBound.Y-panel1.VerticalScroll.Value, _tileBound.X, _tileBound.Y);
e.DrawRectangle(_pen, rec);
e.DrawImage(im, rec, _tile, GraphicsUnit.Pixel);
}
}
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
if (_initalized) DrawGrid(e.Graphics);
}
}
}
The design code and such is literally all design and has no functionality and has no need to be here.
Sorry for the bad code but I have tried many double buffering techniques and such to fix this problem so its a bit hacked up 
Anyone got some ideas to stop this flicker?
Thanks ! 
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there are a few ways to reduce flickering, the most obvious one is to make your Paint handler cheaper, i.e. consume less CPU cycles and fewer objects. In your case, here are some suggestions:
1.
there seems to be an image file that gets loaded and decoded each and every time; I suggest you store that image as a class member and load it only once.
2.
you are calling panel1.HorizontalScroll.Value and panel1.VerticalScroll.Value over and over; you'd better store those in a couple of local variables (ADDED: within your Paint handler of course).
So try these, then re-evaluate the situation.
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read formatted code with indentation, so please use PRE tags for code snippets.
I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).
modified on Wednesday, June 9, 2010 3:51 PM
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Updated Code:
using System.Drawing;
using System.Windows.Forms;
namespace TileMapper.Presentation.Controls
{
public partial class MapRenderer : UserControl
{
private Point _tileBound;
private Point _rowsColumns;
private bool _initalized = false;
public MapRenderer()
{
InitializeComponent();
this.DoubleBuffered = true;
this.SetStyle(ControlStyles.DoubleBuffer |
ControlStyles.OptimizedDoubleBuffer |
ControlStyles.UserPaint |
ControlStyles.AllPaintingInWmPaint, true);
this.UpdateStyles();
}
public void InitalizeGrid(int tileWidth, int tileHeight, int rows, int columns)
{
_tileBound = new Point(tileWidth, tileHeight);
_rowsColumns = new Point(rows, columns);
panel1.AutoScrollMinSize = new Size(_tileBound.X * _rowsColumns.X, _tileBound.Y * _rowsColumns.Y);
_initalized = true;
_pen = new Pen(Color.Black);
_tile = new Rectangle(0, 0, _tileBound.X, _tileBound.Y);
_im = Image.FromFile(@"C:/box.png");
_scrollValue = new Point(panel1.HorizontalScroll.Value, panel1.VerticalScroll.Value);
}
private Point _scrollValue;
Pen _pen;
Rectangle _tile;
private Image _im;
void DrawGrid(Graphics e)
{
for (int x = 0; x < _rowsColumns.X; x++)
{
for (int y = 0; y < _rowsColumns.Y; y++)
{
Rectangle rec = new Rectangle(x * _tileBound.X - _scrollValue.X
, y * _tileBound.Y - _scrollValue.Y, _tileBound.X, _tileBound.Y);
e.DrawImage(_im, rec, _tile, GraphicsUnit.Pixel);
}
}
}
private void panel1_Paint_1(object sender, PaintEventArgs e)
{
if (_initalized)
{
_scrollValue.X = panel1.HorizontalScroll.Value;
_scrollValue.Y = panel1.VerticalScroll.Value;
DrawGrid(e.Graphics);
}
}
}
}
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I'm not absolutely sure, but I have the impression that you are trying to create a virtual panel (a big one scrolling inside a smaller one), maybe 32000 * 32000 pixels large, of which only a small part is visible (I can't see the value of _rowsColumns).
Now painting 1 billion pixels when only say 1 million are visible is a huge waste. I can only hope that the PaintEventArgs holds something (maybe ClipRectangle, maybe some member of Graphics) that will enable you to skip most iterations of your nested for loops.
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read formatted code with indentation, so please use PRE tags for code snippets.
I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).
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using System.Drawing;
using System.Windows.Forms;
namespace TileMapper.Presentation.Controls
{
public partial class MapRenderer : UserControl
{
private Point _tileBound;
private Point _rowsColumns;
private bool _initalized = false;
Rectangle[,] _renderBounds;
public MapRenderer()
{
InitializeComponent();
this.DoubleBuffered = true;
this.SetStyle(ControlStyles.DoubleBuffer |
ControlStyles.OptimizedDoubleBuffer |
ControlStyles.UserPaint |
ControlStyles.AllPaintingInWmPaint, true);
this.UpdateStyles();
}
public void InitalizeGrid(int tileWidth, int tileHeight, int rows, int columns)
{
_tileBound = new Point(tileWidth, tileHeight);
_rowsColumns = new Point(rows, columns);
panel1.AutoScrollMinSize = new Size(_tileBound.X * _rowsColumns.X, _tileBound.Y * _rowsColumns.Y);
_initalized = true;
_pen = new Pen(Color.Black);
_tile = new Rectangle(0, 0, _tileBound.X, _tileBound.Y);
_im = Image.FromFile(@"D:/tile.png");
_scrollValue = new Point(panel1.HorizontalScroll.Value, panel1.VerticalScroll.Value);
_renderBounds = new Rectangle[_tileBound.X, _tileBound.Y];
for (int x = 0; x < _tileBound.X; x++)
{
for (int y = 0; y < _tileBound.Y; y++)
{
_renderBounds[x,y] = new Rectangle(x * _tileBound.X
, y * _tileBound.Y, _tileBound.X, _tileBound.Y);
}
}
}
private Point _scrollValue;
Pen _pen;
Rectangle _tile;
private Image _im;
void DrawGrid(Graphics e, Rectangle bound)
{
int start = bound.X / _tileBound.X;
int end = bound.X/_tileBound.X + bound.Width/_tileBound.X;
int startY = bound.Y / _tileBound.Y;
int endY = bound.Y + bound.Height/_tileBound.Y;
for (int x = start; x < end; x++)
{
for (int y = startY; y < endY; y++)
{
e.DrawImage(_im, _renderBounds[x,y], _tile, GraphicsUnit.Pixel);
}
}
}
private void panel1_Paint_1(object sender, PaintEventArgs e)
{
if (_initalized)
{
Rectangle a = e.ClipRectangle;
_scrollValue.X = panel1.HorizontalScroll.Value;
_scrollValue.Y = panel1.VerticalScroll.Value;
DrawGrid(e.Graphics, a);
}
}
private void panel1_Scroll(object sender, ScrollEventArgs e)
{
panel1.Refresh();
}
}
}
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I take it flickering is acceptable now?
yes you now must paint while scrolling; I'd guess a panel1.Invalidate() should do it, Refresh() would be more expensive as it waits for the repaint to finish IIRC.
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read formatted code with indentation, so please use PRE tags for code snippets.
I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).
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Ok I invalidated the panel on the Scroll event but it flickers allot when it move the scroll slider it just looks plain ugly ! Is there another way as its visual effects is the same as when I use "panel1.Refresh()" ?
Thanks for your help anyway I apologize for my incompetence xD
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it is high time you describe your overall goal, and the set-up of your controls. How many panels (or other Controls) are there, what is their purpose and relationship? etc.
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read formatted code with indentation, so please use PRE tags for code snippets.
I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).
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My goal is to create a simple control that can render a 2 dimensional grid.
Its inputs are (tilewidth,tileheight,rows,columns) and the idea is that it can somehow generate the images like a grid inside a panel which can be scrolled left,right, up and down. This should allow me to be able to create a grid that is larger than the form and scroll across it to see different tiles.
The problem with the one I made so far (with your assistance) is that it flickers when I scroll, on the "Scroll" event of the panel I force it to "Invalidate()" but this seems to make It flicker. If I do not use "Invalidate" or "Refresh" in the Scroll event of the panel then it does not show the updated grid that is drawn in the Paint event in the panel.
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0.
I'm not sure I understand the role of the images in said grid. Is this a board game?
1.
You did not answer "How many panels (or other Controls) are there, what is their purpose and relationship?"
2.
Whatever approach, while scrolling, the view will update; and you could then complain for it to be sluggish i.e. not tracking your scroll movements fast enough, or flickering which may (or may not) mean it is following your scroll movement too nervously.
3.
From what you told, did you consider having a (large) DataGridView inside a (smaller) Panel, with Panel.AutoScroll=true?
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read formatted code with indentation, so please use PRE tags for code snippets.
I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).
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0.
It is going to be used for a basic 2D Map editor so that I can make levels for games in XNA easier.
Each tile can have an image and various properties associated with it and as map sizes vary I could have one map at 50*50 tiles or another at 100*100 tiles (x,y)
1.
The panel is the only control running,its part of a custom control that can be dragged and dropped from the toolbox, literally just a panel component with features to render the grid using the System.Draw.
Its on a test form on its own, im testing it with a 100 * 100 tile grid at 32*32 width *height.
2.
I have played with the speed of which it scrolls, it appears that even a very small change in its scroll values cause the panel to flicker due to it being Invalidated() on the "Scroll" event of the panel.
3.
I dont know how a data-grid can help as this it visual drawing to the panel, im only drawing the grid to the panel as I need something that can scroll easily.
Hope this helps and thanks !
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OK, I now have a better view on your app. Thanks.
So I take it your entire UserControl is showing (part of) the gridded map, and has its AutoScroll set true. I did some experiments with a Form holding a small autoscroll Panel which holds a much larger panel, and that seems to scroll quite well. Maybe you still have something causing lots of CPU cycles getting wasted, but I don't recall having seen so in your latest Paint handler.
Or is what you have shown only a simplified snippet, and some more expensive operations are also present?
BTW: I have no XNA experience, however I somehow do expect someone to pop in and tell you now to use XNA for this editor too.
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read formatted code with indentation, so please use PRE tags for code snippets.
I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).
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using System.Drawing;
using System.Windows.Forms;
namespace TileMapper.Presentation.Controls
{
public partial class MapRenderer : UserControl
{
private Point _tileBound;
private Point _rowsColumns;
private bool _initalized = false;
Rectangle[,] _renderBounds;
public MapRenderer()
{
InitializeComponent();
this.DoubleBuffered = true;
this.SetStyle(
ControlStyles.OptimizedDoubleBuffer , true);
this.UpdateStyles();
panel1.HorizontalScroll.LargeChange = 1;
}
public void InitalizeGrid(int tileWidth, int tileHeight, int rows, int columns)
{
_tileBound = new Point(tileWidth, tileHeight);
_rowsColumns = new Point(rows, columns);
panel1.AutoScrollMinSize = new Size(_tileBound.X * _rowsColumns.X, _tileBound.Y * _rowsColumns.Y);
_initalized = true;
_pen = new Pen(Color.Black);
_tile = new Rectangle(0, 0, _tileBound.X, _tileBound.Y);
_im = Image.FromFile(@"C:/box.png");
_scrollValue = new Point(panel1.HorizontalScroll.Value, panel1.VerticalScroll.Value);
_renderBounds = new Rectangle[_tileBound.X, _tileBound.Y];
for (int x = 0; x < _tileBound.X; x++)
{
for (int y = 0; y < _tileBound.Y; y++)
{
_renderBounds[x,y] = new Rectangle(x * _tileBound.X
, y * _tileBound.Y, _tileBound.X, _tileBound.Y);
}
}
}
private Point _scrollValue;
Pen _pen;
Rectangle _tile;
private Image _im;
void DrawGrid(Graphics e, Rectangle bound)
{
int start = bound.X / _tileBound.X;
int end = bound.X/_tileBound.X + bound.Width/_tileBound.X;
int startY = bound.Y / _tileBound.Y;
int endY = bound.Y + bound.Height/_tileBound.Y;
for (int x = start; x < end; x++)
{
for (int y = startY; y < endY; y++)
{
e.DrawImage(_im, _renderBounds[x,y], _tile, GraphicsUnit.Pixel);
}
}
}
private void panel1_Paint_1(object sender, PaintEventArgs e)
{
if (_initalized)
{
Rectangle a = e.ClipRectangle;
_scrollValue.X = panel1.HorizontalScroll.Value;
_scrollValue.Y = panel1.VerticalScroll.Value;
DrawGrid(e.Graphics, a);
}
}
private void panel1_Scroll(object sender, ScrollEventArgs e)
{
panel1.Invalidate();
}
}
}
..>Designer code..
namespace TileMapper.Presentation.Controls
{
partial class MapRenderer
{
private System.ComponentModel.IContainer components = null;
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Component Designer generated code
private void InitializeComponent()
{
this.panel1 = new System.Windows.Forms.Panel();
this.SuspendLayout();
this.panel1.AutoScroll = true;
this.panel1.BackColor = System.Drawing.Color.White;
this.panel1.Location = new System.Drawing.Point(12, 24);
this.panel1.Name = "panel1";
this.panel1.Size = new System.Drawing.Size(583, 319);
this.panel1.TabIndex = 0;
this.panel1.Scroll += new System.Windows.Forms.ScrollEventHandler(this.panel1_Scroll);
this.panel1.Paint += new System.Windows.Forms.PaintEventHandler(this.panel1_Paint_1);
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.Controls.Add(this.panel1);
this.Name = "MapRenderer";
this.Size = new System.Drawing.Size(612, 358);
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.Panel panel1;
}
}
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OK, the one thing I would simplify is the Graphics.DrawImage; when you specify both source and destination rectangles it will perform a scaling, whereas you probably don't need one. Drawing an entire bitmap at some location can be handled swiftly by Graphics.DrawImage(image, x, y);
I am surprised your Panel is AutoScroll; your UserControl is too I assume (but I don't see that). As I said, (non-scrolling large) panel in small autoscrolling panel works fine for me, so I assume non-scrolling large panel in autoscrolling UserControl should too.
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read formatted code with indentation, so please use PRE tags for code snippets.
I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).
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Thanks for your help I should be able to get it sorted !
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You're welcome.
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read formatted code with indentation, so please use PRE tags for code snippets.
I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).
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Sir/Mam
Sir i want to know in c# how to dynamically bind the data. After Selecting any node on right click it gives option like insert,edit,delete. on selecting insert option it data must be feeded to the database and reflect also on tree view control.
Thanks
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Follow these instructions
get you data from the database formatted for loading into a treeview
populate the treeview placing either the ID or the datarow into the tag property
add a context menu to the treeview
handle the crud events
when Add then pop a dialog to get the information from the user
save the dialog information back to the database
reload the treeview from the database
Never underestimate the power of human stupidity
RAH
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