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#pragma once
#include <AK/AKString.h>
#include <AK/Badge.h>
#include <AK/Function.h>
#include <AK/HashTable.h>
#include <AK/Retainable.h>
#include <LibGUI/GModelIndex.h>
#include <LibGUI/GVariant.h>
#include <SharedGraphics/TextAlignment.h>
class Font;
class GAbstractView;
enum class GSortOrder
{
None,
Ascending,
Descending
};
class GModelNotification {
public:
enum Type
{
Invalid = 0,
ModelUpdated,
};
explicit GModelNotification(Type type, const GModelIndex& index = GModelIndex())
: m_type(type)
, m_index(index)
{
}
Type type() const { return m_type; }
GModelIndex index() const { return m_index; }
private:
Type m_type { Invalid };
GModelIndex m_index;
};
class GModel : public Retainable<GModel> {
public:
struct ColumnMetadata {
int preferred_width { 0 };
TextAlignment text_alignment { TextAlignment::CenterLeft };
const Font* font { nullptr };
};
enum class Role
{
Display,
Sort,
Custom,
ForegroundColor,
BackgroundColor,
Icon
};
virtual ~GModel();
virtual int row_count(const GModelIndex& = GModelIndex()) const = 0;
virtual int column_count(const GModelIndex& = GModelIndex()) const = 0;
virtual String row_name(int) const { return {}; }
virtual String column_name(int) const { return {}; }
virtual ColumnMetadata column_metadata(int) const { return {}; }
virtual GVariant data(const GModelIndex&, Role = Role::Display) const = 0;
virtual void update() = 0;
virtual GModelIndex parent_index(const GModelIndex&) const { return {}; }
virtual GModelIndex index(int row, int column = 0, const GModelIndex& = GModelIndex()) const { return create_index(row, column); }
virtual GModelIndex sibling(int row, int column, const GModelIndex& parent) const;
virtual bool is_editable(const GModelIndex&) const { return false; }
virtual void set_data(const GModelIndex&, const GVariant&) {}
bool is_valid(const GModelIndex& index) const
{
return index.row() >= 0 && index.row() < row_count() && index.column() >= 0 && index.column() < column_count();
}
void set_selected_index(const GModelIndex&);
GModelIndex selected_index() const { return m_selected_index; }
virtual int key_column() const { return -1; }
virtual GSortOrder sort_order() const { return GSortOrder::None; }
virtual void set_key_column_and_sort_order(int, GSortOrder) {}
void register_view(Badge<GAbstractView>, GAbstractView&);
void unregister_view(Badge<GAbstractView>, GAbstractView&);
Function<void(GModel&)> on_model_update;
Function<void(const GModelIndex&)> on_selection_changed;
protected:
GModel();
void for_each_view(Function<void(GAbstractView&)>);
void did_update();
GModelIndex create_index(int row, int column, void* data = nullptr) const;
private:
HashTable<GAbstractView*> m_views;
GModelIndex m_selected_index;
};
inline GModelIndex GModelIndex::parent() const
{
return m_model ? m_model->parent_index(*this) : GModelIndex();
}
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