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/*
* Copyright (c) 2021, Matthew Olsson <mattco@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "PDFViewer.h"
#include <LibGUI/Action.h>
#include <LibGUI/Painter.h>
#include <LibPDF/Renderer.h>
static constexpr int PAGE_PADDING = 25;
PDFViewer::PDFViewer()
{
set_should_hide_unnecessary_scrollbars(true);
set_focus_policy(GUI::FocusPolicy::StrongFocus);
set_scrollbars_enabled(true);
start_timer(30'000);
}
void PDFViewer::set_document(RefPtr<PDF::Document> document)
{
m_document = document;
m_current_page_index = document->get_first_page_index();
m_zoom_level = initial_zoom_level;
m_rendered_page_list.clear();
m_rendered_page_list.ensure_capacity(document->get_page_count());
for (u32 i = 0; i < document->get_page_count(); i++)
m_rendered_page_list.unchecked_append(HashMap<u32, RenderedPage>());
update();
}
RefPtr<Gfx::Bitmap> PDFViewer::get_rendered_page(u32 index)
{
auto& rendered_page_map = m_rendered_page_list[index];
auto existing_rendered_page = rendered_page_map.get(m_zoom_level);
if (existing_rendered_page.has_value() && existing_rendered_page.value().rotation == m_rotations)
return existing_rendered_page.value().bitmap;
auto rendered_page = render_page(m_document->get_page(index));
rendered_page_map.set(m_zoom_level, { rendered_page, m_rotations });
return rendered_page;
}
void PDFViewer::paint_event(GUI::PaintEvent& event)
{
GUI::Frame::paint_event(event);
GUI::Painter painter(*this);
painter.add_clip_rect(widget_inner_rect());
painter.add_clip_rect(event.rect());
painter.fill_rect(event.rect(), Color(0x80, 0x80, 0x80));
if (!m_document)
return;
auto page = get_rendered_page(m_current_page_index);
set_content_size(page->size());
painter.translate(frame_thickness(), frame_thickness());
painter.translate(-horizontal_scrollbar().value(), -vertical_scrollbar().value());
int x = max(0, (width() - page->width()) / 2);
int y = max(0, (height() - page->height()) / 2);
painter.blit({ x, y }, *page, page->rect());
}
void PDFViewer::mousewheel_event(GUI::MouseEvent& event)
{
if (!m_document)
return;
bool scrolled_down = event.wheel_delta_y() > 0;
if (event.ctrl()) {
if (scrolled_down) {
zoom_out();
} else {
zoom_in();
}
} else {
auto& scrollbar = event.shift() ? horizontal_scrollbar() : vertical_scrollbar();
if (scrolled_down) {
if (scrollbar.value() == scrollbar.max()) {
if (m_current_page_index < m_document->get_page_count() - 1) {
m_current_page_index++;
if (on_page_change)
on_page_change(m_current_page_index);
scrollbar.set_value(0);
}
} else {
scrollbar.increase_slider_by(20);
}
} else {
if (scrollbar.value() == 0) {
if (m_current_page_index > 0) {
m_current_page_index--;
if (on_page_change)
on_page_change(m_current_page_index);
scrollbar.set_value(scrollbar.max());
}
} else {
scrollbar.decrease_slider_by(20);
}
}
update();
}
}
void PDFViewer::mousedown_event(GUI::MouseEvent& event)
{
if (event.button() == GUI::MouseButton::Middle) {
m_pan_starting_position = to_content_position(event.position());
set_override_cursor(Gfx::StandardCursor::Drag);
}
}
void PDFViewer::mouseup_event(GUI::MouseEvent&)
{
set_override_cursor(Gfx::StandardCursor::None);
}
void PDFViewer::mousemove_event(GUI::MouseEvent& event)
{
if (event.buttons() & GUI::MouseButton::Middle) {
auto delta = to_content_position(event.position()) - m_pan_starting_position;
horizontal_scrollbar().decrease_slider_by(delta.x());
vertical_scrollbar().decrease_slider_by(delta.y());
update();
}
}
void PDFViewer::timer_event(Core::TimerEvent&)
{
// Clear the bitmap vector of all pages except the current page
for (size_t i = 0; i < m_rendered_page_list.size(); i++) {
if (i != m_current_page_index)
m_rendered_page_list[i].clear();
}
}
void PDFViewer::zoom_in()
{
if (m_zoom_level < number_of_zoom_levels - 1) {
m_zoom_level++;
update();
}
}
void PDFViewer::zoom_out()
{
if (m_zoom_level > 0) {
m_zoom_level--;
update();
}
}
void PDFViewer::reset_zoom()
{
m_zoom_level = initial_zoom_level;
update();
}
void PDFViewer::rotate(int degrees)
{
m_rotations = (m_rotations + degrees + 360) % 360;
update();
}
RefPtr<Gfx::Bitmap> PDFViewer::render_page(const PDF::Page& page)
{
auto zoom_scale_factor = static_cast<float>(zoom_levels[m_zoom_level]) / 100.0f;
auto page_width = page.media_box.upper_right_x - page.media_box.lower_left_x;
auto page_height = page.media_box.upper_right_y - page.media_box.lower_left_y;
auto page_scale_factor = page_height / page_width;
auto height = static_cast<float>(this->height() - 2 * frame_thickness() - PAGE_PADDING * 2) * zoom_scale_factor;
auto width = height / page_scale_factor;
auto bitmap = Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, { width, height }).release_value_but_fixme_should_propagate_errors();
PDF::Renderer::render(*m_document, page, bitmap);
if (page.rotate + m_rotations != 0) {
int rotation_count = ((page.rotate + m_rotations) / 90) % 4;
if (rotation_count == 3) {
bitmap = bitmap->rotated(Gfx::RotationDirection::CounterClockwise).release_value_but_fixme_should_propagate_errors();
} else {
for (int i = 0; i < rotation_count; i++)
bitmap = bitmap->rotated(Gfx::RotationDirection::Clockwise).release_value_but_fixme_should_propagate_errors();
}
}
return bitmap;
}
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