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#include <LibGUI/GSlider.h>
#include <LibGUI/GPainter.h>
#include <SharedGraphics/StylePainter.h>
GSlider::GSlider(GWidget* parent)
: GWidget(parent)
{
}
GSlider::~GSlider()
{
}
void GSlider::set_range(int min, int max)
{
ASSERT(min <= max);
if (m_min == min && m_max == max)
return;
m_min = min;
m_max = max;
if (m_value > max)
m_value = max;
if (m_value < min)
m_value = min;
update();
}
void GSlider::set_value(int value)
{
if (value > m_max)
value = m_max;
if (value < m_min)
value = m_min;
if (m_value == value)
return;
m_value = value;
update();
if (on_value_changed)
on_value_changed(m_value);
}
void GSlider::paint_event(GPaintEvent& event)
{
GPainter painter(*this);
painter.add_clip_rect(event.rect());
Rect track_rect { inner_rect().x(), 0, inner_rect().width(), track_height() };
track_rect.center_vertically_within(inner_rect());
StylePainter::paint_frame(painter, track_rect, FrameShape::Panel, FrameShadow::Sunken, 1);
StylePainter::paint_button(painter, knob_rect(), ButtonStyle::Normal, false, m_knob_hovered);
}
Rect GSlider::knob_rect() const
{
auto inner_rect = this->inner_rect();
float range_size = m_max - m_min;
float adjusted_value = m_value - m_min;
float relative_value = adjusted_value / range_size;
Rect rect {
inner_rect.x() + (int)(relative_value * inner_rect.width()) - knob_width() / 2,
0,
knob_width(),
knob_height()
};
rect.center_vertically_within(inner_rect);
return rect;
}
void GSlider::mousedown_event(GMouseEvent& event)
{
if (event.button() == GMouseButton::Left) {
if (knob_rect().contains(event.position())) {
m_dragging = true;
m_drag_origin = event.position();
m_drag_origin_value = m_value;
return;
}
}
return GWidget::mousedown_event(event);
}
void GSlider::mousemove_event(GMouseEvent& event)
{
set_knob_hovered(knob_rect().contains(event.position()));
if (m_dragging) {
float delta = event.position().x() - m_drag_origin.x();
float scrubbable_range = inner_rect().width();
float value_steps_per_scrubbed_pixel = (m_max - m_min) / scrubbable_range;
float new_value = m_drag_origin_value + (value_steps_per_scrubbed_pixel * delta);
set_value((int)new_value);
return;
}
return GWidget::mousemove_event(event);
}
void GSlider::mouseup_event(GMouseEvent& event)
{
if (event.button() == GMouseButton::Left) {
m_dragging = false;
return;
}
return GWidget::mouseup_event(event);
}
void GSlider::leave_event(CEvent& event)
{
set_knob_hovered(false);
GWidget::leave_event(event);
}
void GSlider::set_knob_hovered(bool hovered)
{
if (m_knob_hovered == hovered)
return;
m_knob_hovered = hovered;
update(knob_rect());
}
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