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/*
* Copyright (c) 2021-2022, Matthew Olsson <mattco@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/HashMap.h>
#include <LibGUI/AbstractScrollableWidget.h>
#include <LibGfx/Bitmap.h>
#include <LibPDF/Document.h>
static constexpr size_t initial_zoom_level = 8;
struct PageDimensionCache {
// Fixed for a given document
struct PageInfo {
Gfx::FloatSize size;
int rotation;
};
// Based on PageInfo, also depends on some dynamic factors like
// zoom level and app size
struct RenderInfo {
Gfx::FloatSize size;
float total_height_before_this_page;
};
Vector<PageInfo> page_info;
Vector<RenderInfo> render_info;
float max_width;
float total_height;
};
class PDFViewer : public GUI::AbstractScrollableWidget {
C_OBJECT(PDFViewer)
public:
enum class PageViewMode {
Single,
Multiple,
};
virtual ~PDFViewer() override = default;
ALWAYS_INLINE u32 current_page() const { return m_current_page_index; }
void set_current_page(u32 current_page);
ALWAYS_INLINE RefPtr<PDF::Document> const& document() const { return m_document; }
PDF::PDFErrorOr<void> set_document(RefPtr<PDF::Document>);
Function<void(u32 new_page)> on_page_change;
void zoom_in();
void zoom_out();
void reset_zoom();
void rotate(int degrees);
PageViewMode page_view_mode() const { return m_page_view_mode; }
void set_page_view_mode(PageViewMode);
protected:
PDFViewer();
virtual void paint_event(GUI::PaintEvent&) override;
virtual void resize_event(GUI::ResizeEvent&) override;
virtual void mousewheel_event(GUI::MouseEvent&) override;
virtual void mousedown_event(GUI::MouseEvent&) override;
virtual void mouseup_event(GUI::MouseEvent&) override;
virtual void mousemove_event(GUI::MouseEvent&) override;
virtual void timer_event(Core::TimerEvent&) override;
private:
struct RenderedPage {
NonnullRefPtr<Gfx::Bitmap> bitmap;
int rotation;
};
PDF::PDFErrorOr<NonnullRefPtr<Gfx::Bitmap>> get_rendered_page(u32 index);
PDF::PDFErrorOr<NonnullRefPtr<Gfx::Bitmap>> render_page(u32 page_index);
PDF::PDFErrorOr<void> cache_page_dimensions(bool recalculate_fixed_info = false);
void change_page(u32 new_page);
RefPtr<PDF::Document> m_document;
u32 m_current_page_index { 0 };
Vector<HashMap<u32, RenderedPage>> m_rendered_page_list;
u8 m_zoom_level { initial_zoom_level };
PageDimensionCache m_page_dimension_cache;
PageViewMode m_page_view_mode;
Gfx::IntPoint m_pan_starting_position;
int m_rotations { 0 };
};
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