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LibCore+LibGUI: Add is<T>(CObject&) and to<T>(CObject&) helpers.

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This commit is contained in:
Andreas Kling 2019-05-27 04:06:01 +02:00
parent 723ba91f74
commit 0c85d3dba9
5 changed files with 53 additions and 30 deletions
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36
LibGUI/GWidget.h
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@ -141,18 +141,8 @@ public:
void set_window(GWindow*);
GWidget* parent_widget()
{
if (parent() && parent()->is_widget())
return static_cast<GWidget*>(parent());
return nullptr;
}
const GWidget* parent_widget() const
{
if (parent() && parent()->is_widget())
return static_cast<const GWidget*>(parent());
return nullptr;
}
GWidget* parent_widget();
const GWidget* parent_widget() const;
void set_fill_with_background_color(bool b) { m_fill_with_background_color = b; }
bool fill_with_background_color() const { return m_fill_with_background_color; }
@ -189,8 +179,8 @@ public:
void for_each_child_widget(Callback callback)
{
for_each_child([&] (auto& child) {
if (child.is_widget())
return callback(static_cast<GWidget&>(child));
if (is<GWidget>(child))
return callback(to<GWidget>(child));
return IterationDecision::Continue;
});
}
@ -233,3 +223,21 @@ private:
HashMap<GShortcut, GAction*> m_local_shortcut_actions;
};
template<> inline bool is<GWidget>(const CObject& object)
{
return object.is_widget();
}
inline GWidget* GWidget::parent_widget()
{
if (parent() && is<GWidget>(*parent()))
return &to<GWidget>(*parent());
return nullptr;
}
inline const GWidget* GWidget::parent_widget() const
{
if (parent() && is<GWidget>(*parent()))
return &to<const GWidget>(*parent());
return nullptr;
}