TextEditor: Search box should find on return, close itself on escape

This patch adds basic keyboard access to the search box. We also yield
focus back gracefully to the text document when the search box is no
longer wanted.

Focus should probably move automatically when an ancestor of the
currently focused widget if made invisible..

Applications/TextEditor/TextEditorWidget.cpp

@@ -24,17 +24,17 @@ TextEditorWidget::TextEditorWidget()
     m_editor->set_ruler_visible(true);
     m_editor->set_automatic_indentation_enabled(true);
 
-    auto* find_widget = new GWidget(this);
-    find_widget->set_fill_with_background_color(true);
-    find_widget->set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
-    find_widget->set_preferred_size(0, 22);
-    find_widget->set_layout(make<GBoxLayout>(Orientation::Horizontal));
-    find_widget->layout()->set_margins({ 2, 2, 2, 2 });
-    find_widget->set_visible(false);
+    m_find_widget = new GWidget(this);
+    m_find_widget->set_fill_with_background_color(true);
+    m_find_widget->set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
+    m_find_widget->set_preferred_size(0, 22);
+    m_find_widget->set_layout(make<GBoxLayout>(Orientation::Horizontal));
+    m_find_widget->layout()->set_margins({ 2, 2, 2, 2 });
+    m_find_widget->set_visible(false);
 
-    m_find_textbox = new GTextBox(find_widget);
+    m_find_textbox = new GTextBox(m_find_widget);
 
-    m_find_button = new GButton("Find", find_widget);
+    m_find_button = new GButton("Find", m_find_widget);
     m_find_button->set_size_policy(SizePolicy::Fixed, SizePolicy::Fill);
     m_find_button->set_preferred_size(100, 0);
 
@@ -53,8 +53,17 @@ TextEditorWidget::TextEditorWidget()
         }
     };
 
-    m_find_action = GAction::create("Find...", { Mod_Ctrl, Key_F }, [this, find_widget](auto&) {
-        find_widget->set_visible(true);
+    m_find_textbox->on_return_pressed = [this] {
+        m_find_button->click();
+    };
+
+    m_find_textbox->on_escape_pressed = [this] {
+        m_find_widget->set_visible(false);
+        m_editor->set_focus(true);
+    };
+
+    m_find_action = GAction::create("Find...", { Mod_Ctrl, Key_F }, [this](auto&) {
+        m_find_widget->set_visible(true);
         m_find_textbox->set_focus(true);
     });
 

Applications/TextEditor/TextEditorWidget.h

@@ -32,4 +32,5 @@ private:
 
     GTextBox* m_find_textbox { nullptr };
     GButton* m_find_button { nullptr };
+    GWidget* m_find_widget { nullptr };
 };