[gimp/wip/Jehan/issue-498-quick-brush-edit: 520/523] app: use modifiers set in GimpModifiersManager rather than hardcoded.




commit d5890cc1d6d2823c9b4d208f8710c14883eb0c7b
Author: Jehan <jehan girinstud io>
Date:   Tue Jul 26 19:52:47 2022 +0200

    app: use modifiers set in GimpModifiersManager rather than hardcoded.
    
    For now GimpModifiersManager returns the same modifiers as what was
    previously hardcoded and we have no GUI yet to change the settings. But
    the core of the new feature is in place.

 app/display/gimpdisplayshell-callbacks.c   |   4 +-
 app/display/gimpdisplayshell-tool-events.c | 482 +++++++++++++++++------------
 app/display/gimpdisplayshell.h             |   9 +-
 3 files changed, 283 insertions(+), 212 deletions(-)
---
diff --git a/app/display/gimpdisplayshell-callbacks.c b/app/display/gimpdisplayshell-callbacks.c
index 3f9e6dd4f1..9bfc09873c 100644
--- a/app/display/gimpdisplayshell-callbacks.c
+++ b/app/display/gimpdisplayshell-callbacks.c
@@ -411,7 +411,7 @@ gimp_display_shell_vadjustment_changed (GtkAdjustment    *adjustment,
   /*  If we are panning with mouse, scrollbars are to be ignored or
    *  they will cause jitter in motion
    */
-  if (! shell->scrolling)
+  if (shell->mod_action == GIMP_MODIFIER_ACTION_NONE)
     gimp_display_shell_scroll (shell,
                                0,
                                gtk_adjustment_get_value (adjustment) -
@@ -425,7 +425,7 @@ gimp_display_shell_hadjustment_changed (GtkAdjustment    *adjustment,
   /* If we are panning with mouse, scrollbars are to be ignored or
    * they will cause jitter in motion
    */
-  if (! shell->scrolling)
+  if (shell->mod_action == GIMP_MODIFIER_ACTION_NONE)
     gimp_display_shell_scroll (shell,
                                gtk_adjustment_get_value (adjustment) -
                                shell->offset_x,
diff --git a/app/display/gimpdisplayshell-tool-events.c b/app/display/gimpdisplayshell-tool-events.c
index 8df1c60cae..0c4d9cf1a0 100644
--- a/app/display/gimpdisplayshell-tool-events.c
+++ b/app/display/gimpdisplayshell-tool-events.c
@@ -72,6 +72,7 @@
 #include "gimpdisplayshell-scroll.h"
 #include "gimpdisplayshell-tool-events.h"
 #include "gimpdisplayshell-transform.h"
+#include "gimpmodifiersmanager.h"
 #include "gimpimagewindow.h"
 #include "gimpmotionbuffer.h"
 #include "gimpstatusbar.h"
@@ -148,6 +149,12 @@ static void       gimp_display_shell_activate_action          (GimpUIManager
                                                                const gchar       *action_desc,
                                                                GVariant          *value);
 
+static gboolean   gimp_display_triggers_context_menu          (const GdkEvent    *event,
+                                                               GimpDisplayShell  *shell,
+                                                               Gimp              *gimp,
+                                                               const GimpCoords  *image_coords,
+                                                               gboolean           force);
+
 
 /*  public functions  */
 
@@ -221,7 +228,7 @@ gimp_display_shell_events (GtkWidget        *widget,
           default:
             if (shell->space_release_pending   ||
                 shell->button1_release_pending ||
-                shell->scrolling)
+                shell->mod_action != GIMP_MODIFIER_ACTION_NONE)
               return TRUE;
             break;
           }
@@ -312,16 +319,17 @@ gimp_display_shell_canvas_tool_events (GtkWidget        *canvas,
                                        GdkEvent         *event,
                                        GimpDisplayShell *shell)
 {
-  GimpDisplay     *display;
-  GimpImage       *image;
-  Gimp            *gimp;
-  GimpCoords       display_coords;
-  GimpCoords       image_coords;
-  GdkModifierType  state;
-  guint32          time;
-  gboolean         device_changed   = FALSE;
-  gboolean         return_val       = FALSE;
-  gboolean         update_sw_cursor = FALSE;
+  GimpDisplay          *display;
+  GimpImage            *image;
+  Gimp                 *gimp;
+  GimpModifiersManager *mod_manager;
+  GimpCoords            display_coords;
+  GimpCoords            image_coords;
+  GdkModifierType       state;
+  guint32               time;
+  gboolean              device_changed   = FALSE;
+  gboolean              return_val       = FALSE;
+  gboolean              update_sw_cursor = FALSE;
 
   g_return_val_if_fail (gtk_widget_get_realized (canvas), FALSE);
 
@@ -379,6 +387,8 @@ gimp_display_shell_canvas_tool_events (GtkWidget        *canvas,
                                        &image_coords, state);
     }
 
+  mod_manager = GIMP_MODIFIERS_MANAGER (shell->display->config->modifiers_manager);
+
   switch (event->type)
     {
     case GDK_ENTER_NOTIFY:
@@ -479,7 +489,9 @@ gimp_display_shell_canvas_tool_events (GtkWidget        *canvas,
         GdkModifierType  button_state;
 
         /*  ignore new mouse events  */
-        if (gimp->busy || shell->scrolling || shell->grab_pointer ||
+        if (gimp->busy                                     ||
+            shell->mod_action != GIMP_MODIFIER_ACTION_NONE ||
+            shell->grab_pointer                            ||
             shell->button1_release_pending)
           return TRUE;
 
@@ -516,38 +528,7 @@ gimp_display_shell_canvas_tool_events (GtkWidget        *canvas,
                                           &image_coords, state & ~button_state,
                                           FALSE);
 
-        if (gdk_event_triggers_context_menu (event))
-          {
-            GimpUIManager   *ui_manager;
-            const gchar     *ui_path;
-            GdkModifierType  mod_state;
-
-            mod_state = state & gimp_get_all_modifiers_mask ();
-
-            /* Menu only with a right-click and no modifiers. */
-            if (mod_state == 0)
-              {
-                ui_manager = tool_manager_get_popup_active (gimp,
-                                                            &image_coords, state,
-                                                            display,
-                                                            &ui_path);
-
-                if (! ui_manager)
-                  {
-                    ui_manager = shell->popup_manager;
-                    ui_path    = "/dummy-menubar/image-popup";
-                  }
-
-                gimp_ui_manager_ui_popup_at_pointer (ui_manager, ui_path, event,
-                                                     NULL, NULL);
-              }
-            else if (mod_state == GDK_MOD1_MASK)
-              {
-                gimp_display_shell_start_scrolling (shell, event, state,
-                                                    bevent->x, bevent->y);
-              }
-          }
-        else if (bevent->button == 1)
+        if (bevent->button == 1)
           {
             if (! gimp_display_shell_pointer_grab (shell, event,
                                                    GDK_POINTER_MOTION_MASK |
@@ -562,16 +543,14 @@ gimp_display_shell_canvas_tool_events (GtkWidget        *canvas,
                 GimpCoords      last_motion;
 
                 active_tool = tool_manager_get_active (gimp);
-                motion_mode = gimp_tool_control_get_motion_mode (
-                                active_tool->control);
+                motion_mode = gimp_tool_control_get_motion_mode (active_tool->control);
 
                 if (motion_mode == GIMP_MOTION_MODE_EXACT)
                   {
                     /* enable motion compression for the canvas window for the
                      * duration of the stroke
                      */
-                    gdk_window_set_event_compression (
-                      gtk_widget_get_window (canvas), FALSE);
+                    gdk_window_set_event_compression (gtk_widget_get_window (canvas), FALSE);
                   }
 
                 /* Use the last evaluated velocity&direction instead of the
@@ -592,10 +571,33 @@ gimp_display_shell_canvas_tool_events (GtkWidget        *canvas,
                                                   display);
               }
           }
-        else if (bevent->button == 2)
+        else
           {
-            gimp_display_shell_start_scrolling (shell, event, state,
-                                                bevent->x, bevent->y);
+            GdkDevice            *device;
+            GimpModifierAction    action;
+
+            device = gdk_event_get_source_device (event);
+            action = gimp_modifiers_manager_get_action (mod_manager, device,
+                                                        bevent->button, bevent->state);
+            shell->mod_action = action;
+            switch (action)
+              {
+              case GIMP_MODIFIER_ACTION_MENU:
+                gimp_display_triggers_context_menu (event, shell, gimp, &image_coords, TRUE);
+                break;
+              case GIMP_MODIFIER_ACTION_PANNING:
+              case GIMP_MODIFIER_ACTION_ZOOMING:
+              case GIMP_MODIFIER_ACTION_ROTATING:
+              case GIMP_MODIFIER_ACTION_STEP_ROTATING:
+              case GIMP_MODIFIER_ACTION_LAYER_PICKING:
+              case GIMP_MODIFIER_ACTION_BRUSH_SIZE:
+              case GIMP_MODIFIER_ACTION_BRUSH_PIXEL_SIZE:
+                gimp_display_shell_start_scrolling (shell, event, state,
+                                                    bevent->x, bevent->y);
+              case GIMP_MODIFIER_ACTION_NONE:
+                gimp_display_triggers_context_menu (event, shell, gimp, &image_coords, FALSE);
+                break;
+              }
           }
 
         return_val = TRUE;
@@ -682,7 +684,7 @@ gimp_display_shell_canvas_tool_events (GtkWidget        *canvas,
              *  a button press we intentionally ignored because we had
              *  a grab on another device at the time of the press
              */
-            if (! shell->grab_pointer || shell->scrolling)
+            if (! shell->grab_pointer || shell->mod_action != GIMP_MODIFIER_ACTION_NONE)
               return TRUE;
 
             if (active_tool &&
@@ -715,29 +717,35 @@ gimp_display_shell_canvas_tool_events (GtkWidget        *canvas,
 
             gimp_display_shell_pointer_ungrab (shell, event);
           }
-        else if (bevent->button == 2)
-          {
-            if (shell->scrolling                 &&
-                ! shell->button1_release_pending &&
-                (! shell->space_release_pending ||
-                 shell->display->config->space_bar_action != GIMP_SPACE_BAR_ACTION_PAN))
-              gimp_display_shell_stop_scrolling (shell, event);
-          }
-        else if (bevent->button == 3)
-          {
-            if (shell->mod1_settings)
-              gimp_display_shell_stop_scrolling (shell, event);
-          }
         else
           {
-            GdkEventButton *bevent = (GdkEventButton *) event;
-            GimpController *mouse  = gimp_controllers_get_mouse (gimp);
+            GdkDevice            *device;
+            GimpModifierAction    action;
 
-            if (!(shell->scrolling || shell->grab_pointer) &&
-                mouse && gimp_controller_mouse_button (GIMP_CONTROLLER_MOUSE (mouse),
-                                                       bevent))
+            device = gdk_event_get_source_device (event);
+            action = gimp_modifiers_manager_get_action (mod_manager, device,
+                                                        bevent->button, bevent->state);
+
+            switch (action)
               {
-                return TRUE;
+              case GIMP_MODIFIER_ACTION_MENU:
+                break;
+              case GIMP_MODIFIER_ACTION_PANNING:
+              case GIMP_MODIFIER_ACTION_ZOOMING:
+              case GIMP_MODIFIER_ACTION_ROTATING:
+              case GIMP_MODIFIER_ACTION_STEP_ROTATING:
+              case GIMP_MODIFIER_ACTION_LAYER_PICKING:
+                if (shell->mod_action != GIMP_MODIFIER_ACTION_NONE &&
+                    ! shell->button1_release_pending &&
+                    (! shell->space_release_pending ||
+                     shell->display->config->space_bar_action != GIMP_SPACE_BAR_ACTION_PAN))
+                  gimp_display_shell_stop_scrolling (shell, event);
+                break;
+              case GIMP_MODIFIER_ACTION_BRUSH_SIZE:
+              case GIMP_MODIFIER_ACTION_BRUSH_PIXEL_SIZE:
+                gimp_display_shell_stop_scrolling (shell, event);
+              case GIMP_MODIFIER_ACTION_NONE:
+                break;
               }
           }
 
@@ -830,7 +838,7 @@ gimp_display_shell_canvas_tool_events (GtkWidget        *canvas,
         gimp_display_shell_proximity_in (shell);
         update_sw_cursor = TRUE;
 
-        if (shell->scrolling)
+        if (shell->mod_action != GIMP_MODIFIER_ACTION_NONE)
           {
             gimp_display_shell_handle_scrolling (shell,
                                                  state, mevent->x, mevent->y);
@@ -1100,21 +1108,24 @@ gimp_display_shell_canvas_tool_events (GtkWidget        *canvas,
 
         active_tool = tool_manager_get_active (gimp);
 
-        if (gimp_display_shell_key_to_state (kevent->keyval) == GDK_MOD1_MASK)
+        if (shell->mod_action == GIMP_MODIFIER_ACTION_LAYER_PICKING)
           {
-            if (shell->picked_layer)
-              {
-                GimpStatusbar *statusbar;
-
-                statusbar = gimp_display_shell_get_statusbar (shell);
-                gimp_statusbar_pop_temp (statusbar);
-
-                shell->picked_layer = NULL;
-              }
-            else if (shell->mod1_settings)
-              {
-                gimp_display_shell_stop_scrolling (shell, event);
-              }
+            /* As a special exception, we finalize the layer picking
+             * action in the key release event. This allows one to
+             * click multiple times and keep a state of the last picked
+             * layer.
+             * */
+            GimpStatusbar *statusbar;
+
+            statusbar = gimp_display_shell_get_statusbar (shell);
+            gimp_statusbar_pop_temp (statusbar);
+
+            shell->picked_layer = NULL;
+            shell->mod_action = GIMP_MODIFIER_ACTION_NONE;
+          }
+        else if (shell->mod_action != GIMP_MODIFIER_ACTION_NONE)
+          {
+            gimp_display_shell_stop_scrolling (shell, event);
           }
 
         if ((state & GDK_BUTTON1_MASK)      &&
@@ -1639,88 +1650,86 @@ gimp_display_shell_start_scrolling (GimpDisplayShell *shell,
                                     gint              x,
                                     gint              y)
 {
-  g_return_if_fail (! shell->scrolling);
-
   gimp_display_shell_pointer_grab (shell, event,
                                    GDK_POINTER_MOTION_MASK |
                                    GDK_BUTTON_RELEASE_MASK);
 
-  shell->scrolling         = TRUE;
   shell->scroll_start_x    = x;
   shell->scroll_start_y    = y;
   shell->scroll_last_x     = x;
   shell->scroll_last_y     = y;
-  shell->rotating          = (state & gimp_get_extend_selection_mask ()) ? TRUE : FALSE;
   shell->rotate_drag_angle = shell->rotate_angle;
-  shell->scaling           = (state & gimp_get_toggle_behavior_mask ()) ? TRUE : FALSE;
-  shell->layer_picking     = ! gdk_event_triggers_context_menu (event) && (state & GDK_MOD1_MASK) ? TRUE : 
FALSE;
-  shell->mod1_settings     = gdk_event_triggers_context_menu (event) && (state & GDK_MOD1_MASK) ? TRUE : 
FALSE;
 
-  if (shell->rotating)
+  switch (shell->mod_action)
     {
+    case GIMP_MODIFIER_ACTION_ROTATING:
+    case GIMP_MODIFIER_ACTION_STEP_ROTATING:
       gimp_display_shell_set_override_cursor (shell,
                                               (GimpCursorType) GDK_EXCHANGE);
-    }
-  else if (shell->scaling)
-    {
+      break;
+    case GIMP_MODIFIER_ACTION_ZOOMING:
       gimp_display_shell_set_override_cursor (shell,
                                               (GimpCursorType) GIMP_CURSOR_ZOOM);
-    }
-  else if (shell->layer_picking)
-    {
-      GimpImage  *image   = gimp_display_get_image (shell->display);
-      GimpLayer  *layer;
-      GimpCoords  image_coords;
-      GimpCoords  display_coords;
-      guint32     time;
-
-      gimp_display_shell_set_override_cursor (shell,
-                                              (GimpCursorType) GIMP_CURSOR_CROSSHAIR);
-
-      gimp_display_shell_get_event_coords (shell, event,
-                                           &display_coords,
-                                           &state, &time);
-      gimp_display_shell_untransform_event_coords (shell,
-                                                   &display_coords, &image_coords,
-                                                   NULL);
-      layer = gimp_image_pick_layer (image,
-                                     (gint) image_coords.x,
-                                     (gint) image_coords.y,
-                                     shell->picked_layer);
-
-      if (layer && ! gimp_image_get_floating_selection (image))
+      break;
+    case GIMP_MODIFIER_ACTION_LAYER_PICKING:
         {
-          GList *layers = gimp_image_get_selected_layers (image);
-
-          if (g_list_length (layers) != 1 || layer != layers->data)
+          GimpImage  *image   = gimp_display_get_image (shell->display);
+          GimpLayer  *layer;
+          GimpCoords  image_coords;
+          GimpCoords  display_coords;
+          guint32     time;
+
+          gimp_display_shell_set_override_cursor (shell,
+                                                  (GimpCursorType) GIMP_CURSOR_CROSSHAIR);
+
+          gimp_display_shell_get_event_coords (shell, event,
+                                               &display_coords,
+                                               &state, &time);
+          gimp_display_shell_untransform_event_coords (shell,
+                                                       &display_coords, &image_coords,
+                                                       NULL);
+          layer = gimp_image_pick_layer (image,
+                                         (gint) image_coords.x,
+                                         (gint) image_coords.y,
+                                         shell->picked_layer);
+
+          if (layer && ! gimp_image_get_floating_selection (image))
             {
-              GimpStatusbar *statusbar;
+              GList *layers = gimp_image_get_selected_layers (image);
+
+              if (g_list_length (layers) != 1 || layer != layers->data)
+                {
+                  GimpStatusbar *statusbar;
 
-              layers = g_list_prepend (NULL, layer);
-              gimp_image_set_selected_layers (image, layers);
-              g_list_free (layers);
+                  layers = g_list_prepend (NULL, layer);
+                  gimp_image_set_selected_layers (image, layers);
+                  g_list_free (layers);
 
-              statusbar = gimp_display_shell_get_statusbar (shell);
-              gimp_statusbar_push_temp (statusbar, GIMP_MESSAGE_INFO,
-                                        GIMP_ICON_LAYER,
-                                        _("Layer picked: '%s'"),
-                                        gimp_object_get_name (layer));
+                  statusbar = gimp_display_shell_get_statusbar (shell);
+                  gimp_statusbar_push_temp (statusbar, GIMP_MESSAGE_INFO,
+                                            GIMP_ICON_LAYER,
+                                            _("Layer picked: '%s'"),
+                                            gimp_object_get_name (layer));
+                }
+              shell->picked_layer = layer;
             }
-          shell->picked_layer = layer;
         }
-    }
-  else if (shell->mod1_settings == TRUE)
-    {
-      Gimp     *gimp       = gimp_display_get_gimp (shell->display);
-      GimpTool *active_tool = tool_manager_get_active (gimp);
+      break;
+    case GIMP_MODIFIER_ACTION_BRUSH_PIXEL_SIZE:
+    case GIMP_MODIFIER_ACTION_BRUSH_SIZE:
+        {
+          Gimp     *gimp        = gimp_display_get_gimp (shell->display);
+          GimpTool *active_tool = tool_manager_get_active (gimp);
 
-      if (GIMP_IS_PAINT_TOOL (active_tool))
-        gimp_paint_tool_force_draw (GIMP_PAINT_TOOL (active_tool), TRUE);
-    }
-  else
-    {
+          if (GIMP_IS_PAINT_TOOL (active_tool))
+            gimp_paint_tool_force_draw (GIMP_PAINT_TOOL (active_tool), TRUE);
+        }
+    case GIMP_MODIFIER_ACTION_MENU:
+    case GIMP_MODIFIER_ACTION_PANNING:
+    case GIMP_MODIFIER_ACTION_NONE:
       gimp_display_shell_set_override_cursor (shell,
                                               (GimpCursorType) GDK_FLEUR);
+      break;
     }
 }
 
@@ -1728,29 +1737,31 @@ static void
 gimp_display_shell_stop_scrolling (GimpDisplayShell *shell,
                                    const GdkEvent   *event)
 {
-  g_return_if_fail (shell->scrolling);
-
   gimp_display_shell_unset_override_cursor (shell);
 
-  if (shell->mod1_settings == TRUE)
+  switch (shell->mod_action)
     {
-      Gimp     *gimp       = gimp_display_get_gimp (shell->display);
-      GimpTool *active_tool = tool_manager_get_active (gimp);
+    case GIMP_MODIFIER_ACTION_BRUSH_PIXEL_SIZE:
+    case GIMP_MODIFIER_ACTION_BRUSH_SIZE:
+        {
+          Gimp     *gimp       = gimp_display_get_gimp (shell->display);
+          GimpTool *active_tool = tool_manager_get_active (gimp);
 
-      if (GIMP_IS_PAINT_TOOL (active_tool))
-        gimp_paint_tool_force_draw (GIMP_PAINT_TOOL (active_tool), FALSE);
+          if (GIMP_IS_PAINT_TOOL (active_tool))
+            gimp_paint_tool_force_draw (GIMP_PAINT_TOOL (active_tool), FALSE);
+        }
+      break;
+    default:
+      break;
     }
 
-  shell->scrolling         = FALSE;
+  shell->mod_action = GIMP_MODIFIER_ACTION_NONE;
+
   shell->scroll_start_x    = 0;
   shell->scroll_start_y    = 0;
   shell->scroll_last_x     = 0;
   shell->scroll_last_y     = 0;
-  shell->rotating          = FALSE;
   shell->rotate_drag_angle = 0.0;
-  shell->scaling           = FALSE;
-  shell->layer_picking     = FALSE;
-  shell->mod1_settings     = FALSE;
 
   /* We may have ungrabbed the pointer when space was released while
    * mouse was down, to be able to catch a GDK_BUTTON_RELEASE event.
@@ -1765,11 +1776,13 @@ gimp_display_shell_handle_scrolling (GimpDisplayShell *shell,
                                      gint              x,
                                      gint              y)
 {
-  g_return_if_fail (shell->scrolling);
+  gboolean constrain = FALSE;
 
-  if (shell->rotating)
+  switch (shell->mod_action)
     {
-      gboolean constrain = (state & GDK_CONTROL_MASK) ? TRUE : FALSE;
+    case GIMP_MODIFIER_ACTION_STEP_ROTATING:
+      constrain = TRUE;
+    case GIMP_MODIFIER_ACTION_ROTATING:
 
       gimp_display_shell_rotate_drag (shell,
                                       shell->scroll_last_x,
@@ -1777,67 +1790,69 @@ gimp_display_shell_handle_scrolling (GimpDisplayShell *shell,
                                       x,
                                       y,
                                       constrain);
-    }
-  else if (shell->scaling)
-    {
+      break;
+    case GIMP_MODIFIER_ACTION_ZOOMING:
       gimp_display_shell_scale_drag (shell,
                                      shell->scroll_start_x,
                                      shell->scroll_start_y,
                                      shell->scroll_last_x - x,
                                      shell->scroll_last_y - y);
-    }
-  else if (shell->layer_picking)
-    {
-      /* Do nothing. We only pick the layer on click. */
-    }
-  else if (shell->mod1_settings == TRUE)
-    {
-      GimpDisplay *display     = shell->display;
-      Gimp        *gimp        = gimp_display_get_gimp (display);
-      GimpTool    *active_tool = tool_manager_get_active (gimp);
-      const gchar *action;
-      gint         size;
-
-      /* Size in image pixels: distance between start and current
-       * position.
-       */
-      size = (gint) (sqrt (pow ((x - shell->scroll_start_x) / shell->scale_x, 2) +
-                           pow ((y - shell->scroll_start_y) / shell->scale_y, 2)) * 2.0);
-
-      /* TODO: different logics with "lock brush to view". */
-      /* TODO 2: scale aware? */
-      action = gimp_tool_control_get_action_pixel_size (active_tool->control);
-      if (action)
-        {
-          GimpImageWindow *window  = gimp_display_shell_get_window (shell);
-          GimpUIManager   *manager = gimp_image_window_get_ui_manager (window);
-
-          gimp_display_shell_activate_action (manager, action,
-                                              g_variant_new_double ((gdouble) size));
-        }
-      else
+      break;
+    case GIMP_MODIFIER_ACTION_BRUSH_PIXEL_SIZE:
+    case GIMP_MODIFIER_ACTION_BRUSH_SIZE:
         {
-          action = gimp_tool_control_get_action_size (active_tool->control);
-
+          GimpDisplay *display     = shell->display;
+          Gimp        *gimp        = gimp_display_get_gimp (display);
+          GimpTool    *active_tool = tool_manager_get_active (gimp);
+          const gchar *action;
+          gint         size;
+
+          /* Size in image pixels: distance between start and current
+           * position.
+           */
+          size = (gint) (sqrt (pow ((x - shell->scroll_start_x) / shell->scale_x, 2) +
+                               pow ((y - shell->scroll_start_y) / shell->scale_y, 2)) * 2.0);
+
+          /* TODO: different logics with "lock brush to view". */
+          /* TODO 2: scale aware? */
+          action = gimp_tool_control_get_action_pixel_size (active_tool->control);
           if (action)
             {
               GimpImageWindow *window  = gimp_display_shell_get_window (shell);
               GimpUIManager   *manager = gimp_image_window_get_ui_manager (window);
 
-              /* Special trick with these enum actions. If using any
-               * positive value, we get the GIMP_ACTION_SELECT_SET behavior
-               * which sets to the given value.
-               */
               gimp_display_shell_activate_action (manager, action,
-                                                  g_variant_new_int32 (size));
+                                                  g_variant_new_double ((gdouble) size));
+            }
+          else
+            {
+              action = gimp_tool_control_get_action_size (active_tool->control);
+
+              if (action)
+                {
+                  GimpImageWindow *window  = gimp_display_shell_get_window (shell);
+                  GimpUIManager   *manager = gimp_image_window_get_ui_manager (window);
+
+                  /* Special trick with these enum actions. If using any
+                   * positive value, we get the GIMP_ACTION_SELECT_SET behavior
+                   * which sets to the given value.
+                   */
+                  gimp_display_shell_activate_action (manager, action,
+                                                      g_variant_new_int32 (size));
+                }
             }
         }
-    }
-  else
-    {
+      break;
+    case GIMP_MODIFIER_ACTION_PANNING:
       gimp_display_shell_scroll (shell,
                                  shell->scroll_last_x - x,
                                  shell->scroll_last_y - y);
+      break;
+    case GIMP_MODIFIER_ACTION_LAYER_PICKING:
+      /* Do nothing. We only pick the layer on click. */
+    case GIMP_MODIFIER_ACTION_MENU:
+    case GIMP_MODIFIER_ACTION_NONE:
+      break;
     }
 
   shell->scroll_last_x = x;
@@ -1877,7 +1892,7 @@ gimp_display_shell_space_pressed (GimpDisplayShell *shell,
 {
   Gimp *gimp = gimp_display_get_gimp (shell->display);
 
-  if (shell->space_release_pending || shell->scrolling)
+  if (shell->space_release_pending || shell->mod_action != GIMP_MODIFIER_ACTION_NONE)
     return;
 
   switch (shell->display->config->space_bar_action)
@@ -2302,3 +2317,62 @@ gimp_display_shell_activate_action (GimpUIManager *manager,
 
   g_free (group_name);
 }
+
+/* Replace gdk_event_triggers_context_menu() as we don't want to trigger
+ * anymore on right click, as we have our own system.
+ * But we trigger with %GDK_MODIFIER_INTENT_CONTEXT_MENU mask.
+ */
+static gboolean
+gimp_display_triggers_context_menu (const GdkEvent   *event,
+                                    GimpDisplayShell *shell,
+                                    Gimp             *gimp,
+                                    const GimpCoords *image_coords,
+                                    gboolean          force)
+{
+  if (event->type == GDK_BUTTON_PRESS)
+    {
+      const GdkEventButton *bevent   = (const GdkEventButton *) event;
+      gboolean              triggers = force;
+
+      g_return_val_if_fail (GDK_IS_WINDOW (bevent->window), FALSE);
+
+      if (! force)
+        {
+          GdkDisplay      *display;
+          GdkModifierType  modifier;
+
+          display  = gdk_window_get_display (bevent->window);
+          modifier = gdk_keymap_get_modifier_mask (gdk_keymap_get_for_display (display),
+                                                   GDK_MODIFIER_INTENT_CONTEXT_MENU);
+
+          triggers = (modifier != 0 &&
+                      bevent->button == GDK_BUTTON_PRIMARY &&
+                      ! (bevent->state & (GDK_BUTTON2_MASK | GDK_BUTTON3_MASK)) &&
+                      (bevent->state & modifier));
+        }
+
+      if (triggers)
+        {
+          GimpUIManager   *ui_manager;
+          const gchar     *ui_path;
+
+          ui_manager = tool_manager_get_popup_active (gimp,
+                                                      image_coords,
+                                                      bevent->state,
+                                                      shell->display,
+                                                      &ui_path);
+
+          if (! ui_manager)
+            {
+              ui_manager = shell->popup_manager;
+              ui_path    = "/dummy-menubar/image-popup";
+            }
+
+          gimp_ui_manager_ui_popup_at_pointer (ui_manager, ui_path, event,
+                                               NULL, NULL);
+          return TRUE;
+        }
+    }
+
+  return FALSE;
+}
diff --git a/app/display/gimpdisplayshell.h b/app/display/gimpdisplayshell.h
index fb1b04aff8..93dc8bacc7 100644
--- a/app/display/gimpdisplayshell.h
+++ b/app/display/gimpdisplayshell.h
@@ -215,20 +215,17 @@ struct _GimpDisplayShell
   gboolean           button1_release_pending;
   const gchar       *space_shaded_tool;
 
-  gboolean           scrolling;
+  /* Modifier action currently ON. */
+  GimpModifierAction mod_action;
+
   gint               scroll_start_x;
   gint               scroll_start_y;
   gint               scroll_last_x;
   gint               scroll_last_y;
-  gboolean           rotating;
   gdouble            rotate_drag_angle;
-  gboolean           scaling;
   gpointer           scroll_info;
-  gboolean           layer_picking;
   GimpLayer         *picked_layer;
 
-  gboolean           mod1_settings;
-
   GeglBuffer        *mask;
   gint               mask_offset_x;
   gint               mask_offset_y;


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