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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2019-2020, William McPherson <willmcpherson2@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "RollWidget.h"
#include "AudioEngine.h"
#include <LibGUI/Painter.h>
#include <LibGUI/ScrollBar.h>
constexpr int note_height = 20;
constexpr int roll_height = note_count * note_height;
RollWidget::RollWidget(GUI::Widget* parent, AudioEngine& audio_engine)
: ScrollableWidget(parent)
, m_audio_engine(audio_engine)
{
set_frame_thickness(2);
set_frame_shadow(Gfx::FrameShadow::Sunken);
set_frame_shape(Gfx::FrameShape::Container);
set_should_hide_unnecessary_scrollbars(true);
set_content_size({ 0, roll_height });
vertical_scrollbar().set_value(roll_height / 2);
}
RollWidget::~RollWidget()
{
}
void RollWidget::paint_event(GUI::PaintEvent& event)
{
int roll_width = widget_inner_rect().width();
double note_width = static_cast<double>(roll_width) / horizontal_notes;
set_content_size({ roll_width, roll_height });
// This calculates the minimum number of rows needed. We account for a
// partial row at the top and/or bottom.
int y_offset = vertical_scrollbar().value();
int note_offset = y_offset / note_height;
int note_offset_remainder = y_offset % note_height;
int paint_area = widget_inner_rect().height() + note_offset_remainder;
if (paint_area % note_height != 0)
paint_area += note_height;
int notes_to_paint = paint_area / note_height;
int key_pattern_index = (notes_per_octave - 1) - (note_offset % notes_per_octave);
GUI::Painter painter(*this);
painter.translate(frame_thickness(), frame_thickness());
painter.translate(0, -note_offset_remainder);
for (int y = 0; y < notes_to_paint; ++y) {
int y_pos = y * note_height;
for (int x = 0; x < horizontal_notes; ++x) {
// This is needed to avoid rounding errors. You can't just use
// note_width as the width.
int x_pos = x * note_width;
int next_x_pos = (x + 1) * note_width;
int distance_to_next_x = next_x_pos - x_pos;
Gfx::Rect rect(x_pos, y_pos, distance_to_next_x, note_height);
if (m_audio_engine.roll_note(y + note_offset, x) == On)
painter.fill_rect(rect, note_pressed_color);
else if (x == m_audio_engine.current_column())
painter.fill_rect(rect, column_playing_color);
else if (key_pattern[key_pattern_index] == Black)
painter.fill_rect(rect, Color::LightGray);
else
painter.fill_rect(rect, Color::White);
painter.draw_line(rect.top_right(), rect.bottom_right(), Color::Black);
painter.draw_line(rect.bottom_left(), rect.bottom_right(), Color::Black);
}
if (--key_pattern_index == -1)
key_pattern_index = notes_per_octave - 1;
}
GUI::Frame::paint_event(event);
}
void RollWidget::mousedown_event(GUI::MouseEvent& event)
{
if (!widget_inner_rect().contains(event.x(), event.y()))
return;
int roll_width = widget_inner_rect().width();
double note_width = static_cast<double>(roll_width) / horizontal_notes;
int y = (event.y() + vertical_scrollbar().value()) - frame_thickness();
y /= note_height;
// There's a case where we can't just use x / note_width. For example, if
// your note_width is 3.1 you will have a rect starting at 3. When that
// leftmost pixel of the rect is clicked you will do 3 / 3.1 which is 0
// and not 1. We can avoid that case by shifting x by 1 if note_width is
// fractional, being careful not to shift out of bounds.
int x = event.x() - frame_thickness();
bool note_width_is_fractional = note_width - static_cast<int>(note_width) != 0;
bool x_is_not_last = x != widget_inner_rect().width() - 1;
if (note_width_is_fractional && x_is_not_last)
++x;
x /= note_width;
m_audio_engine.set_roll_note(y, x, m_audio_engine.roll_note(y, x) == On ? Off : On);
update();
}
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