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LibGUI: Add GModelSelection to help implementing multiple-select views

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Each GAbstractView now has a GModelSelection backed by a simple
HashTable<GModelIndex>. When the selection changes somehow, the view
gets notified via the notify_selection_changed() callback.

In the future it will probably make sense to move to using some kind of
ranges as the internal representation instead.
This commit is contained in:
Andreas Kling 2019-09-07 19:14:59 +02:00
parent 19b69741ed
commit 82559e211d
5 changed files with 95 additions and 0 deletions
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8
Libraries/LibGUI/GAbstractView.h
View file

@ -2,6 +2,7 @@
#include <AK/Function.h>
#include <LibGUI/GModel.h>
#include <LibGUI/GModelSelection.h>
#include <LibGUI/GScrollableWidget.h>
class GModelEditingDelegate;
@ -9,6 +10,7 @@ class GModelEditingDelegate;
class GAbstractView : public GScrollableWidget {
C_OBJECT(GAbstractView)
friend class GModel;
public:
explicit GAbstractView(GWidget* parent);
virtual ~GAbstractView() override;
@ -17,6 +19,9 @@ public:
GModel* model() { return m_model.ptr(); }
const GModel* model() const { return m_model.ptr(); }
GModelSelection& selection() { return m_selection; }
const GModelSelection& selection() const { return m_selection; }
bool is_editable() const { return m_editable; }
void set_editable(bool editable) { m_editable = editable; }
@ -37,6 +42,8 @@ public:
Function<OwnPtr<GModelEditingDelegate>(const GModelIndex&)> aid_create_editing_delegate;
void notify_selection_changed(Badge<GModelSelection>);
protected:
virtual void did_scroll() override;
void activate(const GModelIndex&);
@ -50,5 +57,6 @@ protected:
private:
RefPtr<GModel> m_model;
OwnPtr<GModelEditingDelegate> m_editing_delegate;
GModelSelection m_selection;
bool m_activates_on_selection { false };
};