LibGUI: Give GTextEditor a context menu.

Now GTextEditor manages its own editing actions (cut/copy/paste/etc) and
will show a context menu containing them when requested.

Apps that want to put a GTextEditor's actions in its menu can get to the
actions via public getters. :^)

LibGUI/GMenu.cpp

@@ -29,7 +29,7 @@ GMenu::~GMenu()
     unrealize_menu();
 }
 
-void GMenu::add_action(Retained<GAction>&& action)
+void GMenu::add_action(Retained<GAction> action)
 {
     m_items.append(make<GMenuItem>(m_menu_id, move(action)));
 }

LibGUI/GMenu.h

@@ -2,6 +2,8 @@
 
 #include <LibGUI/GMenuItem.h>
 #include <AK/Function.h>
+#include <AK/Retainable.h>
+#include <AK/Retained.h>
 #include <AK/Vector.h>
 
 class GAction;
@@ -16,7 +18,7 @@ public:
 
     GAction* action_at(int);
 
-    void add_action(Retained<GAction>&&);
+    void add_action(Retained<GAction>);
     void add_separator();
 
     void popup(const Point& screen_position);
@@ -26,6 +28,7 @@ public:
 
 private:
     friend class GMenuBar;
+
     int menu_id() const { return m_menu_id; }
     int realize_menu();
     void unrealize_menu();

LibGUI/GMenuBar.h

@@ -2,7 +2,6 @@
 
 #include <LibGUI/GMenu.h>
 #include <AK/Badge.h>
-#include <AK/OwnPtr.h>
 #include <AK/Vector.h>
 
 class GApplication;

LibGUI/GTextEditor.cpp

@@ -1,9 +1,11 @@
- #include <LibGUI/GTextEditor.h>
+#include <LibGUI/GTextEditor.h>
 #include <LibGUI/GScrollBar.h>
 #include <LibGUI/GFontDatabase.h>
 #include <LibGUI/GClipboard.h>
 #include <LibGUI/GPainter.h>
 #include <LibGUI/GWindow.h>
+#include <LibGUI/GMenu.h>
+#include <LibGUI/GAction.h>
 #include <Kernel/KeyCode.h>
 #include <AK/StringBuilder.h>
 #include <unistd.h>
@@ -22,12 +24,40 @@ GTextEditor::GTextEditor(Type type, GWidget* parent)
     set_font(GFontDatabase::the().get_by_name("Csilla Thin"));
     m_lines.append(make<Line>());
     m_cursor = { 0, 0 };
+    create_actions();
 }
 
 GTextEditor::~GTextEditor()
 {
 }
 
+void GTextEditor::create_actions()
+{
+    m_undo_action = GAction::create("Undo", { Mod_Ctrl, Key_Z }, GraphicsBitmap::load_from_file("/res/icons/16x16/undo.png"), [&] (const GAction&) {
+        // FIXME: Undo
+    });
+
+    m_redo_action = GAction::create("Redo", { Mod_Ctrl, Key_Y }, GraphicsBitmap::load_from_file("/res/icons/16x16/redo.png"), [&] (const GAction&) {
+        // FIXME: Redo
+    });
+
+    m_cut_action = GAction::create("Cut", { Mod_Ctrl, Key_X }, GraphicsBitmap::load_from_file("/res/icons/cut16.png"), [&] (const GAction&) {
+        cut();
+    });
+
+    m_copy_action = GAction::create("Copy", { Mod_Ctrl, Key_C }, GraphicsBitmap::load_from_file("/res/icons/16x16/edit-copy.png"), [&] (const GAction&) {
+        copy();
+    });
+
+    m_paste_action = GAction::create("Paste", { Mod_Ctrl, Key_V }, GraphicsBitmap::load_from_file("/res/icons/paste16.png"), [&] (const GAction&) {
+        paste();
+    });
+
+    m_delete_action = GAction::create("Delete", { 0, Key_Delete }, GraphicsBitmap::load_from_file("/res/icons/16x16/delete.png"), [&] (const GAction&) {
+        do_delete();
+    });
+}
+
 void GTextEditor::set_text(const String& text)
 {
     if (is_single_line() && text.length() == m_lines[0]->length() && !memcmp(text.characters(), m_lines[0]->characters(), text.length()))
@@ -865,6 +895,23 @@ void GTextEditor::did_change()
 
 void GTextEditor::did_update_selection()
 {
+    m_cut_action->set_enabled(has_selection());
+    m_copy_action->set_enabled(has_selection());
     if (on_selection_change)
         on_selection_change();
 }
+
+void GTextEditor::context_menu_event(GContextMenuEvent& event)
+{
+    if (!m_context_menu) {
+        m_context_menu = make<GMenu>("GTextEditor context menu");
+        m_context_menu->add_action(undo_action());
+        m_context_menu->add_action(redo_action());
+        m_context_menu->add_separator();
+        m_context_menu->add_action(cut_action());
+        m_context_menu->add_action(copy_action());
+        m_context_menu->add_action(paste_action());
+        m_context_menu->add_action(delete_action());
+    }
+    m_context_menu->popup(event.screen_position());
+}

LibGUI/GTextEditor.h

@@ -4,6 +4,8 @@
 #include <AK/Function.h>
 #include <AK/HashMap.h>
 
+class GAction;
+class GMenu;
 class GScrollBar;
 class Painter;
 
@@ -106,6 +108,13 @@ public:
 
     virtual const char* class_name() const override { return "GTextEditor"; }
 
+    GAction& undo_action() { return *m_undo_action; }
+    GAction& redo_action() { return *m_redo_action; }
+    GAction& cut_action() { return *m_cut_action; }
+    GAction& copy_action() { return *m_copy_action; }
+    GAction& paste_action() { return *m_paste_action; }
+    GAction& delete_action() { return *m_delete_action; }
+
 private:
     virtual void paint_event(GPaintEvent&) override;
     virtual void mousedown_event(GMouseEvent&) override;
@@ -118,7 +127,9 @@ private:
     virtual bool accepts_focus() const override { return true; }
     virtual void enter_event(CEvent&) override;
     virtual void leave_event(CEvent&) override;
+    virtual void context_menu_event(GContextMenuEvent&) override;
 
+    void create_actions();
     void paint_ruler(Painter&);
     void update_content_size();
     void did_change();
@@ -175,4 +186,11 @@ private:
     int m_soft_tab_width { 4 };
     int m_horizontal_content_padding { 2 };
     GTextRange m_selection;
+    OwnPtr<GMenu> m_context_menu;
+    RetainPtr<GAction> m_undo_action;
+    RetainPtr<GAction> m_redo_action;
+    RetainPtr<GAction> m_cut_action;
+    RetainPtr<GAction> m_copy_action;
+    RetainPtr<GAction> m_paste_action;
+    RetainPtr<GAction> m_delete_action;
 };