Everywhere: Use 'decrease_slider_by()' method from AbstractSlider

The same idea as 'increase_slider_by()', it helps us to avoid repeating the pattern 'set_value(value() - delta)'.
Author: https://github.com/elyse0 Commit: 086615535f Pull-request: https://github.com/SerenityOS/serenity/pull/11163 Reviewed-by: https://github.com/kleinesfilmroellchen ✅ Reviewed-by: https://github.com/metmo ✅
2025-07-30 12:49:19 +00:00 · 2021-10-31 12:27:52 -06:00 · 2021-10-31 12:27:52 -06:00 · 086615535f · 2024-07-17 21:55:24 +09:00
commit 086615535f
parent d53e1fa1fa
8 changed files with 10 additions and 10 deletions
--- a/Userland/Applications/PDFViewer/PDFViewer.cpp
+++ b/Userland/Applications/PDFViewer/PDFViewer.cpp
@ -106,7 +106,7 @@ void PDFViewer::mousewheel_event(GUI::MouseEvent& event)
                    scrollbar.set_value(scrollbar.max());
                }
            } else {
-                scrollbar.set_value(scrollbar.value() - 20);
+                scrollbar.decrease_slider_by(20);
            }
        }
    }