Page 1 of 1
Slow gadget drawing
Posted: Wed Jul 09, 2008 11:54 am
by jvalks
Hi everyone,
I'm just killing some time at work
And I noticed that drawing gadgets is very slow in PB (using 4.20). The window opens immediately , but it takes about 1 second before I see the buttons and listview gadget... Any idea why??
Example code:
Code: Select all
Enumeration
#Window_0
EndEnumeration
;- Gadget Constants
;
Enumeration
#Listview_0
#Button_0
#Button_1
#Button_2
EndEnumeration
Procedure Open_Window_0()
If OpenWindow(#Window_0, 462, 241, 202, 218, "New window ( 0 )", #PB_Window_SystemMenu | #PB_Window_SizeGadget | #PB_Window_TitleBar )
If CreateGadgetList(WindowID(#Window_0))
ListViewGadget(#Listview_0, 10, 10, 180, 120)
ButtonGadget(#Button_0, 10, 140, 60, 30, "1")
ButtonGadget(#Button_1, 70, 170, 60, 30, "2")
ButtonGadget(#Button_2, 130, 140, 60, 30, "3")
EndIf
EndIf
EndProcedure
Open_Window_0()
Repeat
Event = WindowEvent()
Delay(1)
Until Event = #PB_Event_CloseWindow
Posted: Wed Jul 09, 2008 12:06 pm
by gnozal
It doesn't seem slow here, using a PII-300mHz !
You could try this (with #PB_Window_Invisible) :
Code: Select all
Enumeration
#Window_0
EndEnumeration
;- Gadget Constants
;
Enumeration
#Listview_0
#Button_0
#Button_1
#Button_2
EndEnumeration
Procedure Open_Window_0()
If OpenWindow(#Window_0, 462, 241, 202, 218, "New window ( 0 )", #PB_Window_SystemMenu | #PB_Window_SizeGadget | #PB_Window_TitleBar | #PB_Window_Invisible)
If CreateGadgetList(WindowID(#Window_0))
ListViewGadget(#Listview_0, 10, 10, 180, 120)
ButtonGadget(#Button_0, 10, 140, 60, 30, "1")
ButtonGadget(#Button_1, 70, 170, 60, 30, "2")
ButtonGadget(#Button_2, 130, 140, 60, 30, "3")
EndIf
HideWindow(#Window_0, #False)
EndIf
EndProcedure
Open_Window_0()
Repeat
Event = WaitWindowEvent()
Until Event = #PB_Event_CloseWindow
Re: Slow gadget drawing
Posted: Wed Jul 09, 2008 12:13 pm
by tinman
jvalks wrote:I'm just killing some time at work ;) And I noticed that drawing gadgets is very slow in PB (using 4.20). The window opens immediately , but it takes about 1 second before I see the buttons and listview gadget... Any idea why??
Have you tried removing the Delay(1) and replacing the WindowEvent() with WaitWindowEvent()?
Re: Slow gadget drawing
Posted: Wed Jul 09, 2008 12:19 pm
by jvalks
tinman wrote:jvalks wrote:I'm just killing some time at work
And I noticed that drawing gadgets is very slow in PB (using 4.20). The window opens immediately , but it takes about 1 second before I see the buttons and listview gadget... Any idea why??
Have you tried removing the Delay(1) and replacing the WindowEvent() with WaitWindowEvent()?
Ow, that's it!!!! I used WindowEvent() because it's the recommended method, but not for GUI based programs I think...
Thanks!!!
Re: Slow gadget drawing
Posted: Wed Jul 09, 2008 1:14 pm
by PB
You should only use Delay(1) if WindowEvent()=0.
If using WaitWindowEvent(), you don't need Delay() at all.
Posted: Wed Jul 09, 2008 1:25 pm
by Foz
Due to some of my code relies on a network connection to a database, filling in drop down lists slows the rendering time right down ("box, pause, box, pause, etc")
So I start the window invisible and then show the window when it's finished. It's very effective!
Posted: Wed Jul 09, 2008 1:36 pm
by Kaeru Gaman
the problem with the first code is, that a Delay(1) will wait at least 1ms,
but in every case until the next system timeslice, wich is 16ms on a 32bit XP.
so, it will take 16ms to process each event produced during the window construction.
as a result WaitWindowEvent() is faster, because it will not wait 16ms each event.
creating the window invisible may help the look, you can add an "event-eater"
before making the window visible again to make sure it's completely created.