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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/controls/scrollbar/scroll_bar_button.h"
#include <utility>
#include <variant>
#include "base/functional/bind.h"
#include "base/time/tick_clock.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/display/screen.h"
#include "ui/events/base_event_utils.h"
#include "ui/events/event_constants.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/rect.h"
namespace views {
ScrollBarButton::ScrollBarButton(PressedCallback callback,
Type type,
const base::TickClock* tick_clock)
: Button(std::move(callback)),
type_(type),
repeater_(base::BindRepeating(&ScrollBarButton::RepeaterNotifyClick,
base::Unretained(this)),
tick_clock) {
SetFlipCanvasOnPaintForRTLUI(true);
// Not focusable by default.
SetFocusBehavior(FocusBehavior::NEVER);
}
ScrollBarButton::~ScrollBarButton() = default;
gfx::Size ScrollBarButton::CalculatePreferredSize(
const SizeBounds& /*available_size*/) const {
if (!GetWidget()) {
return gfx::Size();
}
return GetNativeTheme()->GetPartSize(
GetNativeThemePart(), GetNativeThemeState(), GetNativeThemeParams());
}
bool ScrollBarButton::OnMousePressed(const ui::MouseEvent& event) {
Button::NotifyClick(event);
repeater_.Start();
return true;
}
void ScrollBarButton::OnMouseReleased(const ui::MouseEvent& event) {
OnMouseCaptureLost();
}
void ScrollBarButton::OnMouseCaptureLost() {
repeater_.Stop();
}
void ScrollBarButton::OnThemeChanged() {
Button::OnThemeChanged();
PreferredSizeChanged();
}
void ScrollBarButton::PaintButtonContents(gfx::Canvas* canvas) {
gfx::Rect bounds(GetPreferredSize({}));
GetNativeTheme()->Paint(canvas->sk_canvas(), GetColorProvider(),
GetNativeThemePart(), GetNativeThemeState(), bounds,
GetNativeThemeParams());
}
ui::NativeTheme::ExtraParams ScrollBarButton::GetNativeThemeParams() const {
ui::NativeTheme::ScrollbarArrowExtraParams scrollbar_arrow;
scrollbar_arrow.is_hovering = GetState() == Button::STATE_HOVERED;
return ui::NativeTheme::ExtraParams(scrollbar_arrow);
}
ui::NativeTheme::Part ScrollBarButton::GetNativeThemePart() const {
switch (type_) {
case Type::kUp:
return ui::NativeTheme::kScrollbarUpArrow;
case Type::kDown:
return ui::NativeTheme::kScrollbarDownArrow;
case Type::kLeft:
return ui::NativeTheme::kScrollbarLeftArrow;
case Type::kRight:
return ui::NativeTheme::kScrollbarRightArrow;
}
NOTREACHED();
}
ui::NativeTheme::State ScrollBarButton::GetNativeThemeState() const {
switch (GetState()) {
case Button::STATE_HOVERED:
return ui::NativeTheme::kHovered;
case Button::STATE_PRESSED:
return ui::NativeTheme::kPressed;
case Button::STATE_DISABLED:
return ui::NativeTheme::kDisabled;
case Button::STATE_NORMAL:
return ui::NativeTheme::kNormal;
case Button::STATE_COUNT:
break;
}
NOTREACHED();
}
void ScrollBarButton::RepeaterNotifyClick() {
gfx::Point cursor_point =
display::Screen::GetScreen()->GetCursorScreenPoint();
ui::MouseEvent event(ui::EventType::kMouseReleased, cursor_point,
cursor_point, ui::EventTimeForNow(),
ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON);
Button::NotifyClick(event);
}
BEGIN_METADATA(ScrollBarButton)
END_METADATA
} // namespace views
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