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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outdated and difficult to reason about.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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8
Applications/Welcome/main.cpp
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@ -83,7 +83,7 @@ int main(int argc, char** argv)
// header
//
auto header = GLabel::construct(background);
auto header = GLabel::construct(background.ptr());
header->set_font(Font::default_bold_font());
header->set_text("Welcome to Serenity");
header->set_text_alignment(TextAlignment::CenterLeft);
@ -94,13 +94,13 @@ int main(int argc, char** argv)
// main section
//
auto main_section = GWidget::construct(background);
auto main_section = GWidget::construct(background.ptr());
main_section->set_layout(make<GBoxLayout>(Orientation::Horizontal));
main_section->layout()->set_margins({ 0, 0, 0, 0 });
main_section->layout()->set_spacing(8);
main_section->set_size_policy(SizePolicy::Fill, SizePolicy::Fill);
auto menu = GWidget::construct(main_section);
auto menu = GWidget::construct(main_section.ptr());
menu->set_layout(make<GBoxLayout>(Orientation::Vertical));
menu->layout()->set_margins({ 0, 0, 0, 0 });
menu->layout()->set_spacing(8);
@ -111,7 +111,7 @@ int main(int argc, char** argv)
stack->set_size_policy(SizePolicy::Fill, SizePolicy::Fill);
for (auto& page : pages) {
auto content = GWidget::construct(stack);
auto content = GWidget::construct(stack.ptr());
content->set_layout(make<GBoxLayout>(Orientation::Vertical));
content->layout()->set_margins({ 0, 0, 0, 0 });
content->layout()->set_spacing(8);