HackStudio: Allow moving the selected widgets using the arrow keys

This is a nice complement to moving widgets with the mouse. :^)

DevTools/HackStudio/CursorTool.cpp

@@ -81,3 +81,32 @@ void CursorTool::on_mousemove(GMouseEvent& event)
         return;
     }
 }
+
+void CursorTool::on_keydown(GKeyEvent& event)
+{
+    dbg() << "CursorTool::on_keydown";
+
+    auto move_selected_widgets_by = [this](int x, int y) {
+        m_editor.selection().for_each([&](auto& widget) {
+            widget.move_by(x, y);
+            return IterationDecision::Continue;
+        });
+    };
+
+    if (event.modifiers() == 0) {
+        switch (event.key()) {
+        case Key_Down:
+            move_selected_widgets_by(0, m_editor.form_widget().grid_size());
+            break;
+        case Key_Up:
+            move_selected_widgets_by(0, -m_editor.form_widget().grid_size());
+            break;
+        case Key_Left:
+            move_selected_widgets_by(-m_editor.form_widget().grid_size(), 0);
+            break;
+        case Key_Right:
+            move_selected_widgets_by(m_editor.form_widget().grid_size(), 0);
+            break;
+        }
+    }
+}

DevTools/HackStudio/CursorTool.h

@@ -19,6 +19,7 @@ private:
     virtual void on_mousedown(GMouseEvent&) override;
     virtual void on_mouseup(GMouseEvent&) override;
     virtual void on_mousemove(GMouseEvent&) override;
+    virtual void on_keydown(GKeyEvent&) override;
 
     Point m_drag_origin;
     HashMap<GWidget*, Point> m_positions_before_drag;

DevTools/HackStudio/FormWidget.cpp

@@ -68,3 +68,8 @@ void FormWidget::mousemove_event(GMouseEvent& event)
 {
     editor().tool().on_mousemove(event);
 }
+
+void FormWidget::keydown_event(GKeyEvent& event)
+{
+    editor().tool().on_keydown(event);
+}

DevTools/HackStudio/FormWidget.h

@@ -16,11 +16,14 @@ public:
     int grid_size() const { return m_grid_size; }
 
 private:
+    virtual bool accepts_focus() const override { return true; }
+
     virtual void paint_event(GPaintEvent&) override;
     virtual void second_paint_event(GPaintEvent&) override;
     virtual void mousedown_event(GMouseEvent&) override;
     virtual void mouseup_event(GMouseEvent&) override;
     virtual void mousemove_event(GMouseEvent&) override;
+    virtual void keydown_event(GKeyEvent&) override;
 
     explicit FormWidget(FormEditorWidget& parent);
 

DevTools/HackStudio/Tool.h

@@ -3,6 +3,7 @@
 #include <AK/Noncopyable.h>
 
 class FormEditorWidget;
+class GKeyEvent;
 class GMouseEvent;
 
 class Tool {
@@ -14,6 +15,7 @@ public:
     virtual void on_mousedown(GMouseEvent&) = 0;
     virtual void on_mouseup(GMouseEvent&) = 0;
     virtual void on_mousemove(GMouseEvent&) = 0;
+    virtual void on_keydown(GKeyEvent&) = 0;
 
     virtual const char* class_name() const = 0;
 

DevTools/HackStudio/WidgetTool.cpp

@@ -18,3 +18,9 @@ void WidgetTool::on_mousemove(GMouseEvent& event)
     (void)event;
     dbg() << "WidgetTool::on_mousemove";
 }
+
+void WidgetTool::on_keydown(GKeyEvent& event)
+{
+    (void)event;
+    dbg() << "WidgetTool::on_keydown";
+}

DevTools/HackStudio/WidgetTool.h

@@ -18,6 +18,7 @@ private:
     virtual void on_mousedown(GMouseEvent&) override;
     virtual void on_mouseup(GMouseEvent&) override;
     virtual void on_mousemove(GMouseEvent&) override;
+    virtual void on_keydown(GKeyEvent&) override;
 
     const GWidgetClassRegistration& m_meta_class;
 };