PixelPaint: Let the move tool optionally select the active layer

Previously, the move tool would always select the topmost layer before
performing a move operation. This commit adds an option for the move
tool to always select the active layer, even if it is behind another.

Userland/Applications/PixelPaint/ImageEditor.cpp

@@ -372,10 +372,9 @@ void ImageEditor::mousedown_event(GUI::MouseEvent& event)
     if (!m_active_tool)
         return;
 
-    if (is<MoveTool>(*m_active_tool)) {
-        if (auto* other_layer = layer_at_editor_position(event.position())) {
-            set_active_layer(other_layer);
-        }
+    if (auto* tool = dynamic_cast<MoveTool*>(m_active_tool); tool && tool->layer_selection_mode() == MoveTool::LayerSelectionMode::ForegroundLayer) {
+        if (auto* foreground_layer = layer_at_editor_position(event.position()))
+            set_active_layer(foreground_layer);
     }
 
     auto layer_event = m_active_layer ? event_adjusted_for_layer(event, *m_active_layer) : event;

Userland/Applications/PixelPaint/Tools/MoveTool.cpp

@@ -11,6 +11,8 @@
 #include "../Layer.h"
 #include <AK/String.h>
 #include <LibGUI/Action.h>
+#include <LibGUI/BoxLayout.h>
+#include <LibGUI/Label.h>
 #include <LibGUI/Menu.h>
 #include <LibGUI/MessageBox.h>
 #include <LibGUI/Painter.h>
@@ -138,6 +140,9 @@ bool MoveTool::on_keydown(GUI::KeyEvent& event)
     if (event.key() == Key_Shift)
         m_keep_aspect_ratio = true;
 
+    if (event.key() == Key_Alt)
+        toggle_selection_mode();
+
     if (m_scaling)
         return true;
 
@@ -176,6 +181,9 @@ void MoveTool::on_keyup(GUI::KeyEvent& event)
 {
     if (event.key() == Key_Shift)
         m_keep_aspect_ratio = false;
+
+    if (event.key() == Key_Alt)
+        toggle_selection_mode();
 }
 
 void MoveTool::on_second_paint(Layer const* layer, GUI::PaintEvent& event)
@@ -243,4 +251,44 @@ Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> MoveTool::cursor()
     return Gfx::StandardCursor::Move;
 }
 
+GUI::Widget* MoveTool::get_properties_widget()
+{
+    if (!m_properties_widget) {
+        m_properties_widget = GUI::Widget::construct();
+        m_properties_widget->set_layout<GUI::VerticalBoxLayout>();
+
+        auto& selection_mode_container = m_properties_widget->add<GUI::Widget>();
+        selection_mode_container.set_layout<GUI::HorizontalBoxLayout>();
+        selection_mode_container.set_fixed_height(46);
+        auto& selection_mode_label = selection_mode_container.add<GUI::Label>("Selection Mode:");
+        selection_mode_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
+        selection_mode_label.set_fixed_size(80, 40);
+
+        auto& mode_radio_container = selection_mode_container.add<GUI::Widget>();
+        mode_radio_container.set_layout<GUI::VerticalBoxLayout>();
+        m_selection_mode_foreground = mode_radio_container.add<GUI::RadioButton>("Foreground");
+
+        m_selection_mode_active = mode_radio_container.add<GUI::RadioButton>("Active Layer");
+
+        m_selection_mode_foreground->on_checked = [&](bool) {
+            m_layer_selection_mode = LayerSelectionMode::ForegroundLayer;
+        };
+        m_selection_mode_active->on_checked = [&](bool) {
+            m_layer_selection_mode = LayerSelectionMode::ActiveLayer;
+        };
+
+        m_selection_mode_foreground->set_checked(true);
+    }
+
+    return m_properties_widget.ptr();
+}
+
+void MoveTool::toggle_selection_mode()
+{
+    if (m_selection_mode_foreground->is_checked())
+        m_selection_mode_active->set_checked(true);
+    else
+        m_selection_mode_foreground->set_checked(true);
+}
+
 }

Userland/Applications/PixelPaint/Tools/MoveTool.h

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
- * Copyright (c) 2022, the SerenityOS developers.
+ * Copyright (c) 2022-2023, the SerenityOS developers.
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -9,6 +9,7 @@
 
 #include "../Layer.h"
 #include "Tool.h"
+#include <LibGUI/RadioButton.h>
 
 namespace PixelPaint {
 
@@ -23,19 +24,29 @@ public:
     MoveTool() = default;
     virtual ~MoveTool() override = default;
 
+    enum class LayerSelectionMode {
+        ForegroundLayer,
+        ActiveLayer,
+    };
+
     virtual void on_mousedown(Layer*, MouseEvent&) override;
     virtual void on_mousemove(Layer*, MouseEvent&) override;
     virtual void on_mouseup(Layer*, MouseEvent&) override;
     virtual bool on_keydown(GUI::KeyEvent&) override;
     virtual void on_keyup(GUI::KeyEvent&) override;
     virtual void on_second_paint(Layer const*, GUI::PaintEvent&) override;
+    virtual GUI::Widget* get_properties_widget() override;
     virtual Variant<Gfx::StandardCursor, NonnullRefPtr<Gfx::Bitmap>> cursor() override;
+    virtual bool is_overriding_alt() override { return true; }
+    LayerSelectionMode layer_selection_mode() const { return m_layer_selection_mode; }
 
 private:
     virtual StringView tool_name() const override { return "Move Tool"sv; }
     ErrorOr<void> update_cached_preview_bitmap(Layer const* layer);
     Optional<ResizeAnchorLocation const> resize_anchor_location_from_cursor_position(Layer const*, MouseEvent&);
+    void toggle_selection_mode();
 
+    LayerSelectionMode m_layer_selection_mode { LayerSelectionMode::ForegroundLayer };
     RefPtr<Layer> m_layer_being_moved;
     Gfx::IntPoint m_event_origin;
     Gfx::IntPoint m_layer_origin;
@@ -43,6 +54,9 @@ private:
     bool m_scaling { false };
     Optional<ResizeAnchorLocation const> m_resize_anchor_location {};
     bool m_keep_aspect_ratio { false };
+    RefPtr<GUI::Widget> m_properties_widget;
+    RefPtr<GUI::RadioButton> m_selection_mode_foreground;
+    RefPtr<GUI::RadioButton> m_selection_mode_active;
 
     RefPtr<Gfx::Bitmap> m_cached_preview_bitmap { nullptr };
 };