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Fix #13022: Ensure minimum size of scrollbar slider. 

When there are many more items than fit in a list, the scrollbar slider scales to fit but there is no minimum size. It becomes too small to click on and use.

Ensure scrollbar slider is at least the same size as the buttons either end.
pull/13119/head
Peter Nelson 2024-11-24 11:11:26 +00:00
parent 0b0b4f50c4
commit 9cc34e64dc
No known key found for this signature in database
GPG Key ID: 8EF8F0A467DF75ED
2 changed files with 12 additions and 8 deletions
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14
src/widget.cpp
View File

@ -145,15 +145,17 @@ static Point HandleScrollbarHittest(const Scrollbar *sb, int top, int bottom, bo
top += button_size; // top points to just below the up-button
bottom -= button_size; // bottom points to top of the down-button
int height = (bottom - top);
int pos = sb->GetPosition();
int count = sb->GetCount();
int cap = sb->GetCapacity();
if (count != 0) top += height * pos / count;
if (count > cap) {
int height = (bottom - top);
int slider_height = std::max(button_size, cap * height / count);
height -= slider_height;
if (cap > count) cap = count;
if (count != 0) bottom -= (count - pos - cap) * height / count;
top += height * sb->GetPosition() / (count - cap);
bottom = top + slider_height;
}
Point pt;
if (horizontal && _current_text_dir == TD_RTL) {
@ -216,7 +218,7 @@ static void ScrollbarClickPositioning(Window *w, NWidgetScrollbar *sb, int x, in
changed = sb->UpdatePosition(rtl ? -1 : 1, Scrollbar::SS_BIG);
} else {
_scrollbar_start_pos = pt.x - mi - button_size;
_scrollbar_size = ma - mi - button_size * 2;
_scrollbar_size = ma - mi - button_size * 2 - (pt.y - pt.x);
w->mouse_capture_widget = sb->index;
_cursorpos_drag_start = _cursor.pos;
}

6
src/window.cpp
View File

@ -2308,8 +2308,10 @@ static void HandleScrollbarScrolling(Window *w)
}
/* Find the item we want to move to. SetPosition will make sure it's inside bounds. */
int pos = RoundDivSU((i + _scrollbar_start_pos) * sb->GetCount(), _scrollbar_size);
if (rtl) pos = sb->GetCount() - sb->GetCapacity() - pos;
int range = sb->GetCount() - sb->GetCapacity();
int pos = RoundDivSU((i + _scrollbar_start_pos) * range, _scrollbar_size);
if (rtl) pos = range - pos;
if (sb->SetPosition(pos)) w->SetDirty();
}