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LibCore: Make CObject reference-counted

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Okay, I've spent a whole day on this now, and it finally kinda works!
With this patch, CObject and all of its derived classes are reference
counted instead of tree-owned.

The previous, Qt-like model was nice and familiar, but ultimately also
outdated and difficult to reason about.

CObject-derived types should now be stored in RefPtr/NonnullRefPtr and
each class can be constructed using the forwarding construct() helper:

    auto widget = GWidget::construct(parent_widget);

Note that construct() simply forwards all arguments to an existing
constructor. It is inserted into each class by the C_OBJECT macro,
see CObject.h to understand how that works.

CObject::delete_later() disappears in this patch, as there is no longer
a single logical owner of a CObject.
This commit is contained in:
Andreas Kling 2019-09-22 00:17:53 +02:00
parent 0c72e0c09f
commit bc319d9e88
45 changed files with 174 additions and 233 deletions
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4
Libraries/LibGUI/GMessageBox.cpp
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@ -64,7 +64,7 @@ void GMessageBox::build()
ObjectPtr<GWidget> message_container = widget;
if (m_type != Type::None) {
message_container = GWidget::construct(widget);
message_container = GWidget::construct(widget.ptr());
message_container->set_layout(make<GBoxLayout>(Orientation::Horizontal));
message_container->layout()->set_margins({ 8, 0, 8, 0 });
message_container->layout()->set_spacing(8);
@ -80,7 +80,7 @@ void GMessageBox::build()
label->set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
label->set_preferred_size(text_width, 16);
auto button_container = GWidget::construct(widget);
auto button_container = GWidget::construct(widget.ptr());
button_container->set_layout(make<GBoxLayout>(Orientation::Horizontal));
button_container->layout()->set_spacing(5);
button_container->layout()->set_margins({ 15, 0, 15, 0 });