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LibGUI: Add GColumnsView

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This is a shiny new widget that can display a tree using Miller columns ^:)

In many cases, the columns view can be used as an alternative to tree view,
but it has its own set of limitations:

* It can only display one model column (so it cannot replace a table)
* It takes up a lot of horizontal space, so it's only suitable if the item text
  is fairly short
* It can only display one subtree at a time

But as long as a usecase doesn't suffer from these limitations, a columns view
can be *much* more intuitive than a tree view.
This commit is contained in:
Sergey Bugaev 2020-01-10 19:07:08 +03:00 • committed by Andreas Kling
parent 10324f95b0
commit edb61d8bfd
3 changed files with 369 additions and 0 deletions
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40
Libraries/LibGUI/GColumnsView.h Normal file
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#pragma once
#include <AK/Vector.h>
#include <LibGUI/GAbstractView.h>
class GColumnsView : public GAbstractView {
C_OBJECT(GColumnsView)
public:
int model_column() const { return m_model_column; }
void set_model_column(int column) { m_model_column = column; }
private:
GColumnsView(GWidget* parent = nullptr);
virtual ~GColumnsView();
GModelIndex index_at_event_position(const Point&) const;
void push_column(GModelIndex& parent_index);
void update_column_sizes();
int item_height() const { return 16; }
int icon_size() const { return 16; }
int icon_spacing() const { return 2; }
int text_padding() const { return 2; }
virtual void did_update_model() override;
virtual void paint_event(GPaintEvent&) override;
virtual void mousedown_event(GMouseEvent& event) override;
virtual void doubleclick_event(GMouseEvent& event) override;
virtual void context_menu_event(GContextMenuEvent& event) override;
virtual void keydown_event(GKeyEvent& event) override;
struct Column {
GModelIndex parent_index;
int width;
// TODO: per-column vertical scroll?
};
Vector<Column> m_columns;
int m_model_column;
};