c# - Custom Control Doesn't Redraw In Designer Or When Running When A Property Is Changed -


i'm creating custom control based on panel control , using draw grid of rectangles inside of it. have made columns , rows properties allow them changed once control added form. if values changed in designer or in form code rectangles never drawn , form appears blank. i've tried different suggestions such this.invalidate() , this.refresh() in set portion of property still can't seem paint new rectangle grid. i'm sure i'm missing somewhere. here's code i'm using:

public class pixel {     public rectangle bounds { get; set; }     public bool ison { get; set; }     public bool isselected { get; set; } } 

public class pixelgridcontrol : panel {     private int columns = 99;     private int rows = 63;     private pixel[,] pixels;     private bool leftmouseisdown = false;     private bool rightmouseisdown = false;      public int columns     {         { return columns; }         set         {             if (value > 0)             {                 columns = value;                 createpixelgrid();                 this.refresh();             }             else             {                 throw new argumentoutofrangeexception("columns", "must > 0");             }         }     }     public int rows     {         { return rows; }         set         {             if (value > 0)             {                 rows = value;                 createpixelgrid();                 this.refresh();             }             else             {                 throw new argumentoutofrangeexception("rows", "must > 0");             }         }     }      public pixelgridcontrol()     {         this.doublebuffered = true;         this.resizeredraw = true;          createpixelgrid();     }      // adjust each column , row fit entire client area:     protected override void onresize(eventargs e)     {         int top = 0;         (int y = 0; y < rows; ++y)         {             int left = 0;             int height = (this.clientsize.height - top) / (rows - y);             (int x = 0; x < columns; ++x)             {                 int width = (this.clientsize.width - left) / (columns - x);                 pixels[x, y].bounds = new rectangle(left, top, width, height);                 left += width;             }             top += height;         }         base.onresize(e);     }      protected override void onpaint(painteventargs e)     {         e.graphics.smoothingmode = smoothingmode.antialias;         (int y = 0; y < rows; ++y)         {             (int x = 0; x < columns; ++x)             {                 if (pixels[x, y].ison)                 {                     e.graphics.fillellipse(brushes.gold, pixels[x, y].bounds);                     e.graphics.drawellipse(pens.goldenrod, pixels[x, y].bounds);                 }                 else                 {                     e.graphics.fillrectangle(brushes.black, pixels[x, y].bounds);                     e.graphics.drawrectangle(pens.white, pixels[x, y].bounds);                 }             }         }         base.onpaint(e);     }     private void createpixelgrid()     {         // initialize pixel grid:         pixels = new pixel[columns, rows];         (int y = 0; y < rows; ++y)         {             (int x = 0; x < columns; ++x)             {                 pixels[x, y] = new pixel();             }         }     } }

the problem don't populate grid cell bounds when rows or columns change, remain rectangle.empty.

to fix that, move code onresize separate method:

private void updatepixelgrid() {     // adjust each column , row fit entire client area:     int top = 0;     (int y = 0; y < rows; ++y)     {         int left = 0;         int height = (this.clientsize.height - top) / (rows - y);         (int x = 0; x < columns; ++x)         {             int width = (this.clientsize.width - left) / (columns - x);             pixels[x, y].bounds = new rectangle(left, top, width, height);             left += width;         }         top += height;     } }

and call both onresize , createpixelgrid:

protected override void onresize(eventargs e) {     updatepixelgrid();     base.onresize(e); }  private void createpixelgrid() {     // initialize pixel grid:     pixels = new pixel[columns, rows];     (int y = 0; y < rows; ++y)     {         (int x = 0; x < columns; ++x)         {             pixels[x, y] = new pixel();         }     }     updatepixelgrid(); }

Comments

Post a Comment

Popular posts from this blog

asynchronous - C# WinSCP .NET assembly: How to upload multiple files asynchronously -

i using winscp .net assembly uploading files. want upload multiple files asynchronous way. have created method works single upload. public class uploadingdata { private sessionoptions _sessionoptions; private session _session; //connection etc private void onconnected() { foreach (var fileinfo in localfileslist) { var task = task.factory.startnew(() => uploadfilesasync(fileinfo)); } } private async task uploadfilesasync(string file) { string remotefilepath = _session.translatelocalpathtoremote(file, @"/", "/test_data_upload"); var uploading = _session.putfiles(file, remotefilepath, false); //when done await task.run(() => thread.sleep(1000)); } } please suggest me correct way. thanks you can use backgroundworker class this: string[] images = new string[50]; foreach (var path in images) { backgroundworker
Read more

aws api gateway - SerializationException in posting new Records via Dynamodb Proxy Service in API -

i getting "__type": "com.amazon.coral.service#serializationexception" as reply in postman & in test console in api gateway trying post record directly dynamodb using api proxy services.. referring aws article - https://aws.amazon.com/blogs/compute/using-amazon-api-gateway-as-a-proxy-for-dynamodb/ here's mapping { "tablename": "tablenamegoeshere", "item": { "id" : "$context.requestid" "eventname" : "$input.path('$.eventname')", "timestamp" : $input.path('$.timestamp'), "answers": "$util.parsejson($input.path('$.answers'))" } } update: did asked ... , worked if try add array of json objects gives me above same error - here's trying now. please - couldnt find on google well #set($inputroot = $input.path('$')) { "tablename": "answer", "item": {
Read more

asp.net - Problems sending emails from forum -

i have been redesigning site has message board, has been written guy looked after site. it has few problems , written in .asp , uses .mdb files database. you can see whole thing here . feel free post if helps, test thing have set using original files , new database. the basic problem when posts message, supposed email sent them, have posted it. when replies, originator supposed message, replier has been posted. i’d have thought @ point in process there should script/file in postmessage.asp? the postmessage.asp page below. <% option explicit %> <!-- #include virtual="common/adovbs.inc" --> <html> <head> <meta http-equiv="content-type" content="text/html; charset=windows-1252"> <meta name="generator" content="microsoft frontpage 4.0"> <meta name="progid" content="frontpage.editor.document"> <title>new page 2</title> <base target="_self"
Read more