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LibGUI: Let GModel specify the drag data type

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GModel subclasses can now override drag_data_type() to specify which type
GAbstractView should set for drag data. The default implementation returns a
null string, which disables dragging from this widget.
This commit is contained in:
Sergey Bugaev 2020-01-22 21:15:46 +03:00 • committed by Andreas Kling
parent d3ce7ae0e3
commit dec95cb8b3
5 changed files with 14 additions and 2 deletions
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7
Libraries/LibGUI/GAbstractView.cpp
View file

@ -191,7 +191,7 @@ void GAbstractView::mousedown_event(GMouseEvent& event)
m_selection.clear();
} else if (event.modifiers() & Mod_Ctrl) {
m_selection.toggle(index);
} else if (event.button() == GMouseButton::Left) {
} else if (event.button() == GMouseButton::Left && !m_model->drag_data_type().is_null()) {
// We might be starting a drag, so don't throw away other selected items yet.
m_might_drag = true;
m_selection.add(index);
@ -219,6 +219,9 @@ void GAbstractView::mousemove_event(GMouseEvent& event)
if (distance_travelled_squared <= drag_distance_threshold)
return GScrollableWidget::mousemove_event(event);
auto data_type = m_model->drag_data_type();
ASSERT(!data_type.is_null());
dbg() << "Initiate drag!";
auto drag_operation = GDragOperation::construct();
@ -248,7 +251,7 @@ void GAbstractView::mousemove_event(GMouseEvent& event)
drag_operation->set_text(text_builder.to_string());
drag_operation->set_bitmap(bitmap);
drag_operation->set_data("url-list", data_builder.to_string());
drag_operation->set_data(data_type, data_builder.to_string());
auto outcome = drag_operation->exec();

1
Libraries/LibGUI/GFileSystemModel.h
View file

@ -117,6 +117,7 @@ public:
virtual void update() override;
virtual GModelIndex parent_index(const GModelIndex&) const override;
virtual GModelIndex index(int row, int column = 0, const GModelIndex& parent = GModelIndex()) const override;
virtual StringView drag_data_type() const override { return "url-list"; }
static String timestamp_string(time_t timestamp)
{

2
Libraries/LibGUI/GModel.h
View file

@ -94,6 +94,8 @@ public:
virtual GSortOrder sort_order() const { return GSortOrder::None; }
virtual void set_key_column_and_sort_order(int, GSortOrder) {}
virtual StringView drag_data_type() const { return {}; }
void register_view(Badge<GAbstractView>, GAbstractView&);
void unregister_view(Badge<GAbstractView>, GAbstractView&);

5
Libraries/LibGUI/GSortingProxyModel.cpp
View file

@ -87,6 +87,11 @@ void GSortingProxyModel::update()
target().update();
}
StringView GSortingProxyModel::drag_data_type() const
{
return target().drag_data_type();
}
void GSortingProxyModel::set_key_column_and_sort_order(int column, GSortOrder sort_order)
{
if (column == m_key_column && sort_order == m_sort_order)

1
Libraries/LibGUI/GSortingProxyModel.h
View file

@ -40,6 +40,7 @@ public:
virtual ColumnMetadata column_metadata(int) const override;
virtual GVariant data(const GModelIndex&, Role = Role::Display) const override;
virtual void update() override;
virtual StringView drag_data_type() const override;
virtual int key_column() const override { return m_key_column; }
virtual GSortOrder sort_order() const override { return m_sort_order; }