47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#include "ui/effects/scroll_content_shadow.h"
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#include "ui/rp_widget.h"
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#include "ui/widgets/scroll_area.h"
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#include "ui/wrap/fade_wrap.h"
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namespace Ui {
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void SetupShadowsToScrollContent(
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not_null<Ui::RpWidget*> parent,
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not_null<Ui::ScrollArea*> scroll,
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rpl::producer<int> &&innerHeightValue) {
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using namespace rpl::mappers;
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const auto topShadow = Ui::CreateChild<Ui::FadeShadow>(parent.get());
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const auto bottomShadow = Ui::CreateChild<Ui::FadeShadow>(parent.get());
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scroll->geometryValue(
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) | rpl::start_with_next_done([=](const QRect &geometry) {
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topShadow->resizeToWidth(geometry.width());
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topShadow->move(
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geometry.x(),
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geometry.y());
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bottomShadow->resizeToWidth(geometry.width());
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bottomShadow->move(
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geometry.x(),
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geometry.y() + geometry.height() - st::lineWidth);
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}, [t = Ui::MakeWeak(topShadow), b = Ui::MakeWeak(bottomShadow)] {
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Ui::DestroyChild(t.data());
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Ui::DestroyChild(b.data());
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}, topShadow->lifetime());
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topShadow->toggleOn(scroll->scrollTopValue() | rpl::map(_1 > 0));
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bottomShadow->toggleOn(rpl::combine(
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scroll->scrollTopValue(),
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scroll->heightValue(),
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std::move(innerHeightValue),
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_1 + _2 < _3));
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}
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} // namespace Ui
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