6f9777d35b
This function is intended to propagate layout changes upwards in the widget hierarchy. Widgets that can know what to do with this information without causing a full layout invalidation (i.e. just because one of their child widgets changed layout/size, doesn't necessairily mean that they have to change their layout/size) can override this and prevent a full relayout and redraw.
457 lines
16 KiB
C++
457 lines
16 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@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 <AK/EnumBits.h>
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#include <AK/JsonObject.h>
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#include <AK/NonnullRefPtr.h>
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#include <AK/Optional.h>
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#include <AK/String.h>
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#include <AK/Variant.h>
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#include <LibCore/Object.h>
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#include <LibCore/Timer.h>
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#include <LibGUI/Event.h>
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#include <LibGUI/FocusPolicy.h>
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#include <LibGUI/Forward.h>
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#include <LibGUI/GML/AST.h>
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#include <LibGUI/Margins.h>
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#include <LibGUI/UIDimensions.h>
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#include <LibGfx/Color.h>
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#include <LibGfx/Forward.h>
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#include <LibGfx/Orientation.h>
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#include <LibGfx/Rect.h>
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#include <LibGfx/StandardCursor.h>
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namespace Core {
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namespace Registration {
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extern Core::ObjectClassRegistration registration_Widget;
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}
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}
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#define REGISTER_WIDGET(namespace_, class_name) \
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namespace Core { \
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namespace Registration { \
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Core::ObjectClassRegistration registration_##class_name( \
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#namespace_ "::" #class_name, []() { return static_ptr_cast<Core::Object>(namespace_::class_name::construct()); }, ®istration_Widget); \
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} \
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}
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namespace GUI {
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enum class HorizontalDirection {
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Left,
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Right
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};
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enum class VerticalDirection {
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Up,
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Down
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};
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enum class AllowCallback {
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No,
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Yes
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};
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class Widget : public Core::Object {
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C_OBJECT(Widget)
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public:
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virtual ~Widget() override;
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Layout* layout() { return m_layout.ptr(); }
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Layout const* layout() const { return m_layout.ptr(); }
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void set_layout(NonnullRefPtr<Layout>);
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template<class T, class... Args>
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ErrorOr<NonnullRefPtr<T>> try_set_layout(Args&&... args)
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{
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auto layout = TRY(T::try_create(forward<Args>(args)...));
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set_layout(*layout);
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return layout;
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}
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template<class T, class... Args>
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inline T& set_layout(Args&&... args)
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{
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auto layout = T::construct(forward<Args>(args)...);
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set_layout(*layout);
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return layout;
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}
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UISize min_size() const { return m_min_size; }
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void set_min_size(UISize const&);
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void set_min_size(UIDimension width, UIDimension height) { set_min_size({ width, height }); }
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UIDimension min_width() const { return m_min_size.width(); }
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UIDimension min_height() const { return m_min_size.height(); }
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void set_min_width(UIDimension width) { set_min_size(width, min_height()); }
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void set_min_height(UIDimension height) { set_min_size(min_width(), height); }
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UISize max_size() const { return m_max_size; }
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void set_max_size(UISize const&);
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void set_max_size(UIDimension width, UIDimension height) { set_max_size({ width, height }); }
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UIDimension max_width() const { return m_max_size.width(); }
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UIDimension max_height() const { return m_max_size.height(); }
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void set_max_width(UIDimension width) { set_max_size(width, max_height()); }
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void set_max_height(UIDimension height) { set_max_size(max_width(), height); }
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UISize preferred_size() const { return m_preferred_size; }
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void set_preferred_size(UISize const&);
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void set_preferred_size(UIDimension width, UIDimension height) { set_preferred_size({ width, height }); }
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UIDimension preferred_width() const { return m_preferred_size.width(); }
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UIDimension preferred_height() const { return m_preferred_size.height(); }
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void set_preferred_width(UIDimension width) { set_preferred_size(width, preferred_height()); }
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void set_preferred_height(UIDimension height) { set_preferred_size(preferred_width(), height); }
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virtual Optional<UISize> calculated_preferred_size() const;
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virtual Optional<UISize> calculated_min_size() const;
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UISize effective_preferred_size() const
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{
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auto effective_preferred_size = preferred_size();
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if (effective_preferred_size.either_is(SpecialDimension::Shrink))
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effective_preferred_size.replace_component_if_matching_with(SpecialDimension::Shrink, effective_min_size());
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if (effective_preferred_size.either_is(SpecialDimension::Fit) && calculated_preferred_size().has_value())
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effective_preferred_size.replace_component_if_matching_with(SpecialDimension::Fit, calculated_preferred_size().value());
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return effective_preferred_size;
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}
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UISize effective_min_size() const
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{
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auto effective_min_size = min_size();
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if (effective_min_size.either_is(SpecialDimension::Shrink) && calculated_min_size().has_value())
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effective_min_size.replace_component_if_matching_with(SpecialDimension::Shrink, calculated_min_size().value());
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return effective_min_size;
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}
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void set_fixed_size(UISize const& size)
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{
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VERIFY(size.has_only_int_values());
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set_min_size(size);
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set_max_size(size);
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}
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void set_fixed_size(UIDimension width, UIDimension height) { set_fixed_size({ width, height }); }
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void set_fixed_width(UIDimension width)
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{
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VERIFY(width.is_int());
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set_min_width(width);
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set_max_width(width);
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}
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void set_fixed_height(UIDimension height)
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{
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VERIFY(height.is_int());
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set_min_height(height);
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set_max_height(height);
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}
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virtual bool is_visible_for_timer_purposes() const override;
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bool has_tooltip() const { return !m_tooltip.is_empty(); }
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String tooltip() const { return m_tooltip; }
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void set_tooltip(String);
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bool is_auto_focusable() const { return m_auto_focusable; }
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void set_auto_focusable(bool auto_focusable) { m_auto_focusable = auto_focusable; }
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bool is_enabled() const { return m_enabled; }
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void set_enabled(bool);
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bool updates_enabled() const { return m_updates_enabled; }
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void set_updates_enabled(bool);
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Gfx::IntRect relative_rect() const { return m_relative_rect; }
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Gfx::IntPoint relative_position() const { return m_relative_rect.location(); }
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Gfx::IntRect window_relative_rect() const;
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Gfx::IntRect screen_relative_rect() const;
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int x() const { return m_relative_rect.x(); }
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int y() const { return m_relative_rect.y(); }
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int width() const { return m_relative_rect.width(); }
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int height() const { return m_relative_rect.height(); }
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int length(Orientation orientation) const { return orientation == Orientation::Vertical ? height() : width(); }
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virtual Margins content_margins() const { return { 0 }; }
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Gfx::IntRect rect() const { return { 0, 0, width(), height() }; }
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Gfx::IntSize size() const { return m_relative_rect.size(); }
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Gfx::IntRect content_rect() const { return this->content_margins().applied_to(rect()); };
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Gfx::IntSize content_size() const { return this->content_rect().size(); };
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// Invalidate the widget (or an area thereof), causing a repaint to happen soon.
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void update();
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void update(Gfx::IntRect const&);
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// Repaint the widget (or an area thereof) immediately.
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void repaint();
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void repaint(Gfx::IntRect const&);
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bool is_focused() const;
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void set_focus(bool, FocusSource = FocusSource::Programmatic);
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Function<void(bool const, const FocusSource)> on_focus_change;
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// Returns true if this widget or one of its descendants is focused.
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bool has_focus_within() const;
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Widget* focus_proxy() { return m_focus_proxy; }
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Widget const* focus_proxy() const { return m_focus_proxy; }
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void set_focus_proxy(Widget*);
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void set_focus_policy(FocusPolicy policy);
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FocusPolicy focus_policy() const;
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enum class ShouldRespectGreediness {
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No = 0,
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Yes
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};
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struct HitTestResult {
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WeakPtr<Widget> widget;
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Gfx::IntPoint local_position;
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};
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HitTestResult hit_test(Gfx::IntPoint const&, ShouldRespectGreediness = ShouldRespectGreediness::Yes);
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Widget* child_at(Gfx::IntPoint const&) const;
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void set_relative_rect(Gfx::IntRect const&);
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void set_relative_rect(int x, int y, int width, int height) { set_relative_rect({ x, y, width, height }); }
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void set_x(int x) { set_relative_rect(x, y(), width(), height()); }
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void set_y(int y) { set_relative_rect(x(), y, width(), height()); }
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void set_width(int width) { set_relative_rect(x(), y(), width, height()); }
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void set_height(int height) { set_relative_rect(x(), y(), width(), height); }
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void move_to(Gfx::IntPoint const& point) { set_relative_rect({ point, relative_rect().size() }); }
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void move_to(int x, int y) { move_to({ x, y }); }
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void resize(Gfx::IntSize const& size) { set_relative_rect({ relative_rect().location(), size }); }
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void resize(int width, int height) { resize({ width, height }); }
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void move_by(int x, int y) { move_by({ x, y }); }
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void move_by(Gfx::IntPoint const& delta) { set_relative_rect({ relative_position().translated(delta), size() }); }
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Gfx::ColorRole background_role() const { return m_background_role; }
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void set_background_role(Gfx::ColorRole);
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Gfx::ColorRole foreground_role() const { return m_foreground_role; }
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void set_foreground_role(Gfx::ColorRole);
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void set_autofill(bool b) { set_fill_with_background_color(b); }
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Window* window()
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{
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if (auto* pw = parent_widget())
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return pw->window();
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return m_window;
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}
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Window const* window() const
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{
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if (auto* pw = parent_widget())
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return pw->window();
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return m_window;
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}
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void set_window(Window*);
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Widget* parent_widget();
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Widget const* parent_widget() const;
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void set_fill_with_background_color(bool b) { m_fill_with_background_color = b; }
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bool fill_with_background_color() const { return m_fill_with_background_color; }
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Gfx::Font const& font() const { return *m_font; }
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void set_font(Gfx::Font const*);
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void set_font(Gfx::Font const& font) { set_font(&font); }
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void set_font_family(String const&);
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void set_font_size(unsigned);
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void set_font_weight(unsigned);
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void set_font_fixed_width(bool);
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void notify_layout_changed(Badge<Layout>);
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void invalidate_layout();
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bool is_visible() const { return m_visible; }
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void set_visible(bool);
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bool spans_entire_window_horizontally() const;
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bool is_greedy_for_hits() const { return m_greedy_for_hits; }
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void set_greedy_for_hits(bool b) { m_greedy_for_hits = b; }
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void move_to_front();
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void move_to_back();
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bool is_frontmost() const;
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bool is_backmost() const;
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Action* action_for_shortcut(Shortcut const&);
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template<typename Callback>
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void for_each_child_widget(Callback callback)
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{
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for_each_child([&](auto& child) {
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if (is<Widget>(child))
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return callback(verify_cast<Widget>(child));
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return IterationDecision::Continue;
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});
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}
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Vector<Widget&> child_widgets() const;
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void do_layout();
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Gfx::Palette palette() const;
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void set_palette(Gfx::Palette const&);
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String title() const;
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void set_title(String);
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Margins const& grabbable_margins() const { return m_grabbable_margins; }
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void set_grabbable_margins(Margins const&);
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Gfx::IntRect relative_non_grabbable_rect() const;
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void set_accepts_emoji_input(bool b) { m_accepts_emoji_input = b; }
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bool accepts_emoji_input() const { return m_accepts_emoji_input; }
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void set_accepts_command_palette(bool b) { m_accepts_command_palette = b; }
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bool accepts_command_palette() const { return m_accepts_command_palette; }
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virtual Gfx::IntRect children_clip_rect() const;
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AK::Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> override_cursor() const { return m_override_cursor; }
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void set_override_cursor(AK::Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>>);
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bool load_from_gml(StringView);
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bool load_from_gml(StringView, RefPtr<Core::Object> (*unregistered_child_handler)(String const&));
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// FIXME: remove this when all uses of shrink_to_fit are eliminated
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void set_shrink_to_fit(bool);
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bool is_shrink_to_fit() const { return preferred_width().is_shrink() || preferred_height().is_shrink(); }
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bool has_pending_drop() const;
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// In order for others to be able to call this, it needs to be public.
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virtual bool load_from_gml_ast(NonnullRefPtr<GUI::GML::Node> ast, RefPtr<Core::Object> (*unregistered_child_handler)(String const&));
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protected:
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Widget();
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virtual void event(Core::Event&) override;
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// This is called after children have been painted.
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virtual void second_paint_event(PaintEvent&);
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virtual void layout_relevant_change_occured();
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virtual void custom_layout() { }
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virtual void did_change_font() { }
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virtual void did_layout() { }
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virtual void paint_event(PaintEvent&);
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virtual void resize_event(ResizeEvent&);
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virtual void show_event(ShowEvent&);
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virtual void hide_event(HideEvent&);
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virtual void keydown_event(KeyEvent&);
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virtual void keyup_event(KeyEvent&);
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virtual void mousemove_event(MouseEvent&);
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virtual void mousedown_event(MouseEvent&);
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virtual void mouseup_event(MouseEvent&);
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virtual void mousewheel_event(MouseEvent&);
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virtual void doubleclick_event(MouseEvent&);
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virtual void context_menu_event(ContextMenuEvent&);
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virtual void focusin_event(FocusEvent&);
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virtual void focusout_event(FocusEvent&);
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virtual void enter_event(Core::Event&);
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virtual void leave_event(Core::Event&);
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virtual void child_event(Core::ChildEvent&) override;
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virtual void change_event(Event&);
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virtual void drag_enter_event(DragEvent&);
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virtual void drag_move_event(DragEvent&);
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virtual void drag_leave_event(Event&);
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virtual void drop_event(DropEvent&);
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virtual void theme_change_event(ThemeChangeEvent&);
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virtual void fonts_change_event(FontsChangeEvent&);
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virtual void screen_rects_change_event(ScreenRectsChangeEvent&);
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virtual void applet_area_rect_change_event(AppletAreaRectChangeEvent&);
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virtual void did_begin_inspection() override;
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virtual void did_end_inspection() override;
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void show_or_hide_tooltip();
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private:
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void handle_paint_event(PaintEvent&);
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void handle_resize_event(ResizeEvent&);
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void handle_mousedown_event(MouseEvent&);
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void handle_mousedoubleclick_event(MouseEvent&);
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void handle_mouseup_event(MouseEvent&);
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void handle_keydown_event(KeyEvent&);
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void handle_enter_event(Core::Event&);
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void handle_leave_event(Core::Event&);
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void focus_previous_widget(FocusSource, bool siblings_only);
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void focus_next_widget(FocusSource, bool siblings_only);
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// HACK: These are used as property getters for the fixed_* size property aliases.
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int dummy_fixed_width() { return 0; }
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int dummy_fixed_height() { return 0; }
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Gfx::IntSize dummy_fixed_size() { return {}; }
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Window* m_window { nullptr };
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RefPtr<Layout> m_layout;
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Gfx::IntRect m_relative_rect;
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Gfx::ColorRole m_background_role;
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Gfx::ColorRole m_foreground_role;
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NonnullRefPtr<Gfx::Font> m_font;
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String m_tooltip;
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UISize m_min_size { SpecialDimension::Shrink };
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UISize m_max_size { SpecialDimension::Grow };
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UISize m_preferred_size { SpecialDimension::Grow };
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Margins m_grabbable_margins;
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bool m_fill_with_background_color { false };
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bool m_visible { true };
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bool m_greedy_for_hits { false };
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bool m_auto_focusable { true };
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bool m_enabled { true };
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bool m_updates_enabled { true };
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bool m_accepts_emoji_input { false };
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bool m_accepts_command_palette { true };
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bool m_default_font { true };
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NonnullRefPtr<Gfx::PaletteImpl> m_palette;
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String m_title { String::empty() };
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WeakPtr<Widget> m_focus_proxy;
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FocusPolicy m_focus_policy { FocusPolicy::NoFocus };
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AK::Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> m_override_cursor { Gfx::StandardCursor::None };
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};
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inline Widget* Widget::parent_widget()
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{
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if (parent() && is<Widget>(*parent()))
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return &verify_cast<Widget>(*parent());
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return nullptr;
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}
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inline Widget const* Widget::parent_widget() const
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{
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if (parent() && is<Widget>(*parent()))
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return &verify_cast<const Widget>(*parent());
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return nullptr;
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}
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}
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template<>
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struct AK::Formatter<GUI::Widget> : AK::Formatter<Core::Object> {
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};
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