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LibGUI: Add AbstractZoomPanWidget widget :^)

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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.
This commit is contained in:
Mustafa Quraish 2022-01-08 04:25:32 -05:00 • committed by Andreas Kling
parent 4d0abf82ed
commit 5d7f2086b0
3 changed files with 257 additions and 0 deletions
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73
Userland/Libraries/LibGUI/AbstractZoomPanWidget.h Normal file
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/*
* Copyright (c) 2022, Mustafa Quraish <mustafa@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibGUI/Frame.h>
#include <LibGfx/Point.h>
#include <LibGfx/Rect.h>
namespace GUI {
class AbstractZoomPanWidget : public GUI::Frame {
C_OBJECT(AbstractZoomPanWidget);
public:
void set_scale(float scale);
float scale() const { return m_scale; }
void set_scale_bounds(float min_scale, float max_scale);
void scale_by(float amount);
void scale_centered(float new_scale, Gfx::IntPoint const& center);
bool is_panning() const { return m_is_panning; }
void start_panning(Gfx::IntPoint const& position);
void stop_panning();
void pan_to(Gfx::IntPoint const& position);
// Should be overridden by derived classes if they want updates.
virtual void handle_relayout(Gfx::IntRect const&) { update(); }
void relayout();
Gfx::FloatPoint frame_to_content_position(Gfx::IntPoint const& frame_position) const;
Gfx::FloatRect frame_to_content_rect(Gfx::IntRect const& frame_rect) const;
Gfx::FloatPoint content_to_frame_position(Gfx::IntPoint const& content_position) const;
Gfx::FloatRect content_to_frame_rect(Gfx::IntRect const& content_rect) const;
virtual void mousewheel_event(GUI::MouseEvent& event) override;
virtual void mousedown_event(GUI::MouseEvent& event) override;
virtual void resize_event(GUI::ResizeEvent& event) override;
virtual void mousemove_event(GUI::MouseEvent& event) override;
virtual void mouseup_event(GUI::MouseEvent& event) override;
void set_original_rect(Gfx::IntRect const& rect) { m_original_rect = rect; }
void set_content_rect(Gfx::IntRect const& content_rect);
void set_origin(Gfx::FloatPoint const& origin) { m_origin = origin; }
void reset_view();
Gfx::IntRect content_rect() const { return m_content_rect; }
Function<void(float)> on_scale_change;
private:
Gfx::IntRect m_original_rect;
Gfx::IntRect m_content_rect;
Gfx::IntPoint m_pan_mouse_pos;
Gfx::FloatPoint m_origin;
Gfx::FloatPoint m_pan_start;
bool m_is_panning { false };
float m_min_scale { 0.1f };
float m_max_scale { 10.0f };
float m_scale { 1.0f };
AK::Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> m_saved_cursor { Gfx::StandardCursor::None };
};
}