SetTextArea() Slider issue

BlitzMax Forums/BlitzMax Programming/SetTextArea() Slider issue

Grisu

(Posted 2006) [#1]

There is an issue with settextarea and sliders.

If you update a text with via this command the vertical slider is not reset to its 0 value. Thus the "new" text is already scrolled to the last set position. A workaround for this is setting the textarea empty with "" and afterwards setting the new text. But this causes a visual flickering as the box needs to be updated twice. :(

Example code:

SuperStrict

Global MyWindow:TGadget=CreateWindow("My Window with WINDOW_TITLEBAR", 200,200,400,400,Null,WINDOW_TITLEBAR)
Global MyText:TGadget=CreateTextArea(10,20,370,280,MyWindow, TEXTAREA_WORDWRAP)
Global MyButton:TGadget=CreateButton("Add Text?",10,340,100,30, MyWindow,BUTTON_OK)
Global txt$="------- EMPTY TEXTAREA ------------------"
SetTextAreaText(MyText,txt$)

txt=""
For Local i:Int=0 To 1000
 txt=txt+" -------------------- Line "+i+" --------------------"
Next 

Repeat
  WaitEvent()
  Select EventID()

  Case EVENT_GADGETACTION

'    SetTextAreaText(MyText,"")  ' <- workaround
    SetTextAreaText(MyText,txt$)  
    SetGadgetText(MyButton,"More text added!")

  Case EVENT_WINDOWCLOSE
     End
  End Select
Forever
End

To see this issue:
Click on the button one time.
Scroll down the slider to bottom or elsewhere.
Click on the button again.

I think the textarea command should do like the workaround by default?

Grisu

skidracer

(Posted 2006) [#2]

I think this is a cursor position issue not a slider issue.

SetTextAreaText will only move the cursor if it falls outside the resulting text.

Hence SetTextAreaText(mytext,"") forces the cursor to home whereas you will need to call

SelectTextAreaText 0,0

to reset the cursor after modifying the text in some other way.