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LibGUI: Have GUI::Splitter track all grabbable areas

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Instead of computing the grabbable areas on the fly in mouse event
handlers, we now figure out which parts of the splitter are grabbable
when something moves around, and then remember it.

This makes the code a lot easier to follow.
This commit is contained in:
Andreas Kling 2021-05-26 21:59:10 +02:00
parent 25468fdcf7
commit 89272e810a
2 changed files with 100 additions and 64 deletions
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27
Userland/Libraries/LibGUI/Splitter.h
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -34,9 +34,8 @@ protected:
virtual void did_layout() override;
private:
void recompute_grabbable_rect(const Widget&, const Widget&);
bool get_resize_candidates_at(const Gfx::IntPoint&, Widget*&, Widget*&);
void override_cursor(bool do_override);
Gfx::IntRect rect_between_widgets(GUI::Widget const& first_widget, GUI::Widget const& second_widget, bool honor_content_margins) const;
Gfx::Orientation m_orientation;
bool m_resizing { false };
@ -48,7 +47,27 @@ private:
Gfx::IntSize m_second_resizee_start_size;
int m_first_resizee_minimum_size { 0 };
int m_second_resizee_minimum_size { 0 };
Gfx::IntRect m_grabbable_rect;
void recompute_grabbables();
struct Grabbable {
// Index in m_grabbables, for convenience.
size_t index { 0 };
// The full grabbable rect, includes the content margin of adjacent elements.
Gfx::IntRect grabbable_rect;
// The rect used for painting. Does not include content margins.
Gfx::IntRect paint_rect;
WeakPtr<Widget> first_widget;
WeakPtr<Widget> second_widget;
};
Grabbable* grabbable_at(Gfx::IntPoint const&);
void set_hovered_grabbable(Grabbable*);
Vector<Grabbable> m_grabbables;
Optional<size_t> m_hovered_index;
};
class VerticalSplitter final : public Splitter {