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LibGUI+SoundPlayer: Add Slider option to jump to cursor

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When the cursor is clicked outside of the slider knob,
the current behavior is that it will step up or down by the
Slider page step amount.

This commit adds an option to jump the slider knob
directly to the where the mouse cursor is on mouse down events.

This behavior is disabled by default. It must be enabled with
`Slider::set_jump_to_cursor()`.

Jump to cursor is enabled in SoundPlayer since most music players
have this behavior.
This commit is contained in:
Nick Miller 2021-06-02 17:42:08 -07:00 • committed by Ali Mohammad Pur
parent 6612e026ba
commit c3a60a5dcd
3 changed files with 22 additions and 2 deletions
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20
Userland/Libraries/LibGUI/Slider.cpp
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@ -87,10 +87,26 @@ void Slider::mousedown_event(MouseEvent& event)
m_drag_origin = event.position();
m_drag_origin_value = value();
return;
}
const auto 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) / static_cast<float>(height());
} else {
normalized_mouse_offset = static_cast<float>(mouse_offset) / static_cast<float>(width());
}
int new_value = static_cast<int>(min() + ((max() - min()) * normalized_mouse_offset));
set_value(new_value);
} else {
if (event.position().primary_offset_for_orientation(orientation()) > knob_rect().last_edge_for_orientation(orientation()))
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)
set_value(value() + page_step());
else if (event.position().primary_offset_for_orientation(orientation()) < knob_rect().first_edge_for_orientation(orientation()))
else if (mouse_offset < knob_first_edge)
set_value(value() - page_step());
}
}