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bug#29002: it.first_visible_x is erroneously 0 while horizontal scrollin
From: |
Keith David Bershatsky |
Subject: |
bug#29002: it.first_visible_x is erroneously 0 while horizontal scrolling. |
Date: |
Wed, 25 Oct 2017 23:20:09 -0700 |
Thank you, Eli, for looking at #29002.
In the screen-shot, line 4 is the current-line and it is hscrolled.
• hscrolling_current_line_p is true.
• w->suspend_auto_hscroll is false.
• w->hscroll > 0.
• All non-current lines are also hscrolled.
• it.first_visible_x == 0.
What would be a good method to programmatically test to see whether all other
lines are hscrolled given the above?
As I visit each screen line from top to bottom of the window, I will need to
determine whether the line is hscrolled and then try make my way over to a
screen relative X coordinate. move_it_in_display_line_to will need an absolute
X.
For example, let's say we are on line 6 in the screen-shot. How do we know
that it is hscrolled? If we know for sure it is hscrolled, then we can tell
move_it_in_display_line_to try and reach (w->hscroll * FRAME_COLUMN_WIDTH (f))
+ my_arbitrary_screen_relative_x.
Keith
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
DATE: [10-25-2017 21:51:55] <26 Oct 2017 07:51:55 +0300>
FROM: Eli Zaretskii <eliz@gnu.org>
>
> * * *
>
> I'm not sure why you expected non-zero values in this case, but if you
> want to identify this situation, use the function
> hscrolling_current_line_p. Or just calculate the value yourself
> using w->hscroll.
- bug#29002: it.first_visible_x is erroneously 0 while horizontal scrolling., Keith David Bershatsky, 2017/10/25
- bug#29002: it.first_visible_x is erroneously 0 while horizontal scrolling., Keith David Bershatsky, 2017/10/25
- bug#29002: it.first_visible_x is erroneously 0 while horizontal scrolling.,
Keith David Bershatsky <=
- bug#29002: it.first_visible_x is erroneously 0 while horizontal scrolling., Keith David Bershatsky, 2017/10/26
- bug#29002: it.first_visible_x is erroneously 0 while horizontal scrolling., Keith David Bershatsky, 2017/10/29
- bug#29002: it.first_visible_x is erroneously 0 while horizontal scrolling., Keith David Bershatsky, 2017/10/29
- bug#29002: it.first_visible_x is erroneously 0 while horizontal scrolling., Keith David Bershatsky, 2017/10/29
- bug#29002: it.first_visible_x is erroneously 0 while horizontal scrolling., Keith David Bershatsky, 2017/10/29