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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StdLibExtras.h>
#include <LibGUI/Painter.h>
#include <LibGUI/Slider.h>
#include <LibGfx/Palette.h>
#include <LibGfx/StylePainter.h>
REGISTER_WIDGET(GUI, HorizontalSlider)
REGISTER_WIDGET(GUI, Slider)
REGISTER_WIDGET(GUI, VerticalSlider)
namespace GUI {
Slider::Slider(Orientation orientation)
: AbstractSlider(orientation)
{
REGISTER_ENUM_PROPERTY("knob_size_mode", knob_size_mode, set_knob_size_mode, KnobSizeMode,
{ KnobSizeMode::Fixed, "Fixed" },
{ KnobSizeMode::Proportional, "Proportional" });
REGISTER_BOOL_PROPERTY("jump_to_cursor", jump_to_cursor, set_jump_to_cursor);
set_preferred_size(SpecialDimension::Fit);
}
void Slider::paint_event(PaintEvent& event)
{
Painter painter(*this);
painter.add_clip_rect(event.rect());
Gfx::IntRect track_rect;
// To avoid drop shadow peeking out behind the slider knob, we paint the track slightly shorter
int shadow_thickness = 1;
if (orientation() == Orientation::Horizontal) {
track_rect = { inner_rect().x(), 0, inner_rect().width() - shadow_thickness, track_size() };
track_rect.center_vertically_within(inner_rect());
} else {
track_rect = { 0, inner_rect().y(), track_size(), inner_rect().height() - shadow_thickness };
track_rect.center_horizontally_within(inner_rect());
}
Gfx::StylePainter::paint_frame(painter, track_rect, palette(), Gfx::FrameStyle::SunkenPanel);
if (is_enabled())
Gfx::StylePainter::paint_button(painter, knob_rect(), palette(), Gfx::ButtonStyle::Normal, false, m_knob_hovered);
else
Gfx::StylePainter::paint_button(painter, knob_rect(), palette(), Gfx::ButtonStyle::Normal, true, m_knob_hovered);
}
Gfx::IntRect Slider::knob_rect() const
{
auto inner_rect = this->inner_rect();
Gfx::IntRect rect;
rect.set_secondary_offset_for_orientation(orientation(), 0);
rect.set_secondary_size_for_orientation(orientation(), knob_secondary_size());
if (knob_size_mode() == KnobSizeMode::Fixed) {
if (max() - min()) {
float scale = (float)inner_rect.primary_size_for_orientation(orientation()) / (float)(max() - min());
rect.set_primary_offset_for_orientation(orientation(), inner_rect.primary_offset_for_orientation(orientation()) + ((int)((value() - min()) * scale)) - (knob_fixed_primary_size() / 2));
} else
rect.set_primary_size_for_orientation(orientation(), 0);
rect.set_primary_size_for_orientation(orientation(), knob_fixed_primary_size());
} else {
float scale = (float)inner_rect.primary_size_for_orientation(orientation()) / (float)(max() - min() + 1);
rect.set_primary_offset_for_orientation(orientation(), inner_rect.primary_offset_for_orientation(orientation()) + ((int)((value() - min()) * scale)));
if (max() - min())
rect.set_primary_size_for_orientation(orientation(), ::max((int)(scale), knob_fixed_primary_size()));
else
rect.set_primary_size_for_orientation(orientation(), inner_rect.primary_size_for_orientation(orientation()));
}
if (orientation() == Orientation::Horizontal)
rect.center_vertically_within(inner_rect);
else
rect.center_horizontally_within(inner_rect);
return rect;
}
void Slider::start_drag(Gfx::IntPoint start_position)
{
VERIFY(!m_dragging);
m_dragging = true;
m_drag_origin = start_position;
m_drag_origin_value = value();
if (on_drag_start)
on_drag_start();
}
void Slider::mousedown_event(MouseEvent& event)
{
if (event.button() == MouseButton::Primary) {
auto const mouse_offset = event.position().primary_offset_for_orientation(orientation());
if (jump_to_cursor()) {
float normalized_mouse_offset = 0.0f;
if (orientation() == Orientation::Vertical) {
normalized_mouse_offset = static_cast<float>(mouse_offset - track_margin()) / static_cast<float>(inner_rect().height());
} else {
normalized_mouse_offset = static_cast<float>(mouse_offset - track_margin()) / static_cast<float>(inner_rect().width());
}
int new_value = static_cast<int>(min() + ((max() - min()) * normalized_mouse_offset));
set_value(new_value, AllowCallback::No);
start_drag(event.position());
// Delay the callback to make it aware that a drag has started.
if (on_change)
on_change(value());
return;
}
if (knob_rect().contains(event.position())) {
start_drag(event.position());
return;
}
auto knob_first_edge = knob_rect().first_edge_for_orientation(orientation());
auto knob_last_edge = knob_rect().last_edge_for_orientation(orientation());
if (mouse_offset > knob_last_edge)
increase_slider_by_page_steps(1);
else if (mouse_offset < knob_first_edge)
decrease_slider_by_page_steps(1);
}
return Widget::mousedown_event(event);
}
void Slider::mousemove_event(MouseEvent& event)
{
set_knob_hovered(knob_rect().contains(event.position()));
if (m_dragging) {
float delta = event.position().primary_offset_for_orientation(orientation()) - m_drag_origin.primary_offset_for_orientation(orientation());
float scrubbable_range = inner_rect().primary_size_for_orientation(orientation());
float value_steps_per_scrubbed_pixel = (max() - min()) / scrubbable_range;
float new_value = m_drag_origin_value + (value_steps_per_scrubbed_pixel * delta);
set_value((int)roundf(new_value));
return;
}
return Widget::mousemove_event(event);
}
void Slider::end_drag()
{
if (m_dragging) {
m_dragging = false;
if (on_drag_end)
on_drag_end();
}
}
void Slider::mouseup_event(MouseEvent& event)
{
if (event.button() == MouseButton::Primary) {
end_drag();
return;
}
return Widget::mouseup_event(event);
}
void Slider::mousewheel_event(MouseEvent& event)
{
auto acceleration_modifier = step();
auto wheel_delta = event.wheel_delta_y();
if (event.modifiers() == KeyModifier::Mod_Ctrl)
acceleration_modifier *= 6;
if (knob_size_mode() == KnobSizeMode::Proportional)
wheel_delta /= abs(wheel_delta);
if (orientation() == Orientation::Horizontal)
decrease_slider_by(wheel_delta * acceleration_modifier);
else
increase_slider_by(wheel_delta * acceleration_modifier);
Widget::mousewheel_event(event);
}
void Slider::leave_event(Core::Event& event)
{
if (!is_enabled())
return;
set_knob_hovered(false);
Widget::leave_event(event);
}
void Slider::change_event(Event& event)
{
if (event.type() == Event::Type::EnabledChange) {
if (!is_enabled())
m_dragging = false;
}
Widget::change_event(event);
}
void Slider::set_knob_hovered(bool hovered)
{
if (m_knob_hovered == hovered)
return;
m_knob_hovered = hovered;
update(knob_rect());
}
Optional<UISize> Slider::calculated_min_size() const
{
if (orientation() == Gfx::Orientation::Vertical)
return { { knob_secondary_size(), knob_fixed_primary_size() * 2 + track_margin() * 2 } };
return { { knob_fixed_primary_size() * 2 + track_margin() * 2, knob_secondary_size() } };
}
Optional<UISize> Slider::calculated_preferred_size() const
{
if (orientation() == Gfx::Orientation::Vertical)
return { { SpecialDimension::Shrink, SpecialDimension::OpportunisticGrow } };
return { { SpecialDimension::OpportunisticGrow, SpecialDimension::Shrink } };
}
}
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