From 7ccb08ac09a83e81a822712b712dc0473c9b23cf Mon Sep 17 00:00:00 2001 From: crupest Date: Tue, 27 Nov 2018 17:53:21 +0800 Subject: Add mouse wheel support. --- src/ui/controls/scroll_control.cpp | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'src/ui/controls/scroll_control.cpp') diff --git a/src/ui/controls/scroll_control.cpp b/src/ui/controls/scroll_control.cpp index 103a5c20..aa5403d4 100644 --- a/src/ui/controls/scroll_control.cpp +++ b/src/ui/controls/scroll_control.cpp @@ -308,6 +308,29 @@ namespace cru::ui::controls } } + void ScrollControl::OnMouseWheelCore(events::MouseWheelEventArgs& args) + { + Control::OnMouseWheelCore(args); + + constexpr const auto view_delta = 30.0f; + + if (args.GetDelta() == 0.0f) + return; + + const auto content_rect = GetRect(RectRange::Content); + if (IsVerticalScrollEnabled() && GetScrollOffsetY() != (args.GetDelta() > 0.0f ? 0.0f : AtLeast0(GetViewHeight() - content_rect.height))) + { + SetScrollOffset(std::nullopt, GetScrollOffsetY() - args.GetDelta() / WHEEL_DELTA * view_delta); + return; + } + + if (IsHorizontalScrollEnabled() && GetScrollOffsetX() != (args.GetDelta() > 0.0f ? 0.0f : AtLeast0(GetViewWidth() - content_rect.width))) + { + SetScrollOffset(GetScrollOffsetX() - args.GetDelta() / WHEEL_DELTA * view_delta, std::nullopt); + return; + } + } + void ScrollControl::CoerceAndSetOffsets(const float offset_x, const float offset_y, const bool update_children) { const auto old_offset_x = offset_x_; -- cgit v1.2.3