RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 08:18:11 +00:00
Code Issues Activity Actions

LibGUI: Add a simple GWidget class registry/factory

Browse source 
You can now register a GWidget subclass with REGISTER_GWIDGET(class)
and it will be available for factory construction through the new
GWidgetClassRegistration interface.

To obtain a GWidgetClassRegistration for a given class name, you call
GWidgetClassRegistration::find(class_name). You can also iterate over
all the registered classes using GWCR::for_each(callback).

This will be very useful for implementing a proper GUI designer, and
also in the future for things like script bindings.

NOTE: All of the registrations are done in GWidget.cpp at the moment
since I ran into trouble with the fricken linker pruning the global
constructors this mechanism relies on. :^)
This commit is contained in:
Andreas Kling 2019-11-10 10:58:03 +01:00
parent a353d16ff4
commit ca538b6cee
10 changed files with 109 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

26
Libraries/LibGUI/GWidget.h
View file

@ -1,8 +1,8 @@
#pragma once
#include <AK/String.h>
#include <AK/Badge.h>
#include <AK/HashMap.h>
#include <AK/String.h>
#include <LibCore/CElapsedTimer.h>
#include <LibCore/CObject.h>
#include <LibDraw/Color.h>
@ -12,6 +12,10 @@
#include <LibGUI/GEvent.h>
#include <LibGUI/GShortcut.h>
#define REGISTER_GWIDGET(class_name) \
extern GWidgetClassRegistration registration_##class_name; \
GWidgetClassRegistration registration_##class_name(#class_name, [](GWidget* parent) { return class_name::construct(parent); });
class GraphicsBitmap;
class GAction;
class GLayout;
@ -42,6 +46,26 @@ enum class VerticalDirection {
Down
};
class GWidget;
class GWidgetClassRegistration {
AK_MAKE_NONCOPYABLE(GWidgetClassRegistration)
AK_MAKE_NONMOVABLE(GWidgetClassRegistration)
public:
GWidgetClassRegistration(const String& class_name, Function<NonnullRefPtr<GWidget>(GWidget*)> factory);
~GWidgetClassRegistration();
String class_name() const { return m_class_name; }
NonnullRefPtr<GWidget> construct(GWidget* parent) const { return m_factory(parent); }
static void for_each(Function<void(const GWidgetClassRegistration&)>);
static const GWidgetClassRegistration* find(const String& class_name);
private:
String m_class_name;
Function<NonnullRefPtr<GWidget>(GWidget*)> m_factory;
};
class GWidget : public CObject {
C_OBJECT(GWidget)
public: