c# - Flickering issue when overriding WM_PAINT in windows forms -



c# - Flickering issue when overriding WM_PAINT in windows forms -

i guess generic issue , not limited combobox, have problem combobox. extended combobox object mycb mycb : combobox)

what happens every time hover on control, leave control, expand selection box or select value, command flickers. short while can see default (non-replaced) command beingness instantly replaced mine.

i believe what's happening windows first draws "original" command (by calling base.wndproc()) , repaints mine.

the question is, can somehow stop windows painting it's own command , instantly paint mine?

below code overriding wndproc

protected override void wndproc(ref message m) { base.wndproc(ref m); if (m.msg == wm_paint) { graphics gg = this.creategraphics(); gg.fillrectangle(borderbrush, this.clientrectangle); // ... // //draw arrow gg.fillpath(arrowbrush, pth); // ... // if(this.text == "") gg.drawstring("-- select --", this.font, new solidbrush(color.black), rf, sf); else gg.drawstring(this.text, this.font, new solidbrush(color.black), rf, sf); gg.dispose(); } }

what have tried far:

i know can't this:

if (m.msg == wm_paint) { ... } else { base.wndproc(ref m); }

as cause command repaint infinitely (not sure why)

i able remove flickering happened when mouse leaves/enters command adding code

if (m.msg == wm_mousefirst || m.msg == wm_mouseleave) // 0x0200 0x02a3 { m.result = (intptr)1; } else { base.wndproc(ref m); if (m.msg == wm_paint) { ... } }

however doesn't solve problem completely

i looked ilspy check on combobox's wndproc there many windows messages didn't know of perchance immitate achive goal

c# combobox custom-controls

Comments

Post a Comment

Popular posts from this blog

Delphi change the assembly code of a running process -

Delphi change the assembly code of a running process - i'm trying alter address 00741fa5 has push test.009e721c . alter push test.009e71c8 . procedure callback; asm force $9e71c8 end; procedure tform2.btn1click(sender: tobject); var ppid :dword; pprocess : cardinal; begin getwindowthreadprocessid(findwindow(nil,pchar('test')), @ppid); pprocess := openprocess(process_all_access, false, ppid); injectasm(pprocess, $741fa5, 10, integer(@callback), 0); end; here injectasm function (with error checking) function injectasm(process: longword; injectaddress, injectsize, codeaddress, codesize : integer): pointer; var csize, rsize : integer; replaced : array of byte; jmp : array [0..4] of byte; jmpaddress : integer; nopv : byte; : integer; nbr: ulong_ptr; begin //injectsize must equal or greater 5, because need space our //(far) jmp wwxxyyzz instruction //if there's no space, inject in place of few instructions if injectsize ...
Read more

json - Hibernate and Jackson (java.lang.IllegalStateException: Cannot call sendError() after the response has been committed) -

json - Hibernate and Jackson (java.lang.IllegalStateException: Cannot call sendError() after the response has been committed) - hello have problem hibernate , jackson. have 2 pojos @entity @table(name = "users") public class user implements serializable { static final long serialversionuid = 4235637833262722256l; @id @generatedvalue private int id; @column(name = "creation_date") private date creationdate; @column(name = "first_name") private string firstname; @column(name = "last_name") private string lastname; @version @column(name = "version") private int version; @column(name = "e_mail") private string email; @column(name = "enabled") private boolean enabled; @column(name = "login") private string login; @column(name = "password") private string password; @jsonmanagedreference("role") @onetomany(mappedby = "user", cascade = cascadetype.all,fetch = fetchtyp...
Read more

C++ 11 "class" keyword -

C++ 11 "class" keyword - i've started using c++ 11 little bit more , have few questions on special uses of class keyword. know it's used declare class, there's 2 instances have seen don't understand: method<class t>(); and class class_name *var; why precede typename keyword class in first example, , keyword pointer in sec example? that known elaborated type specifier , necessary when class name "shadowed" or "hidden" , need explicit. class t { }; // love of god don't t t; t t2; if compiler smart, give these warnings: main.cpp:15:5: error: must utilize 'class' tag refer type 't' in scope t t2; ^ class main.cpp:14:7: note: class 't' hidden non-type declaration of 't' here t t; ^ if class not defined, deed forwards declaration. for example: template <typename t> void method() { using type = typename t::value_type; } method...
Read more