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https://github.com/RGBCube/serenity
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5d7f2086b0
This is an abstract widget that is meant to handle all the panning / zooming functionality so that all applications implementing it do not have to try to do their own coordinate math.
73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
/*
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* Copyright (c) 2022, Mustafa Quraish <mustafa@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibGUI/Frame.h>
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#include <LibGfx/Point.h>
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#include <LibGfx/Rect.h>
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namespace GUI {
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class AbstractZoomPanWidget : public GUI::Frame {
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C_OBJECT(AbstractZoomPanWidget);
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public:
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void set_scale(float scale);
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float scale() const { return m_scale; }
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void set_scale_bounds(float min_scale, float max_scale);
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void scale_by(float amount);
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void scale_centered(float new_scale, Gfx::IntPoint const& center);
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bool is_panning() const { return m_is_panning; }
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void start_panning(Gfx::IntPoint const& position);
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void stop_panning();
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void pan_to(Gfx::IntPoint const& position);
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// Should be overridden by derived classes if they want updates.
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virtual void handle_relayout(Gfx::IntRect const&) { update(); }
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void relayout();
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Gfx::FloatPoint frame_to_content_position(Gfx::IntPoint const& frame_position) const;
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Gfx::FloatRect frame_to_content_rect(Gfx::IntRect const& frame_rect) const;
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Gfx::FloatPoint content_to_frame_position(Gfx::IntPoint const& content_position) const;
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Gfx::FloatRect content_to_frame_rect(Gfx::IntRect const& content_rect) const;
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virtual void mousewheel_event(GUI::MouseEvent& event) override;
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virtual void mousedown_event(GUI::MouseEvent& event) override;
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virtual void resize_event(GUI::ResizeEvent& event) override;
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virtual void mousemove_event(GUI::MouseEvent& event) override;
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virtual void mouseup_event(GUI::MouseEvent& event) override;
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void set_original_rect(Gfx::IntRect const& rect) { m_original_rect = rect; }
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void set_content_rect(Gfx::IntRect const& content_rect);
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void set_origin(Gfx::FloatPoint const& origin) { m_origin = origin; }
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void reset_view();
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Gfx::IntRect content_rect() const { return m_content_rect; }
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Function<void(float)> on_scale_change;
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private:
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Gfx::IntRect m_original_rect;
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Gfx::IntRect m_content_rect;
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Gfx::IntPoint m_pan_mouse_pos;
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Gfx::FloatPoint m_origin;
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Gfx::FloatPoint m_pan_start;
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bool m_is_panning { false };
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float m_min_scale { 0.1f };
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float m_max_scale { 10.0f };
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float m_scale { 1.0f };
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AK::Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> m_saved_cursor { Gfx::StandardCursor::None };
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};
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}
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