[gnome-sudoku/arnaudb/wip/gtk4: 8/33] Use GestureClick.

[Arnaud B. <arnaudb src gnome org>]

commit d444b40e4a4d5640cdbf3ea7ddd7207d98829e08
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Wed Apr 1 19:56:11 2020 +0200

    Use GestureClick.
    
    And other EventController things.

 src/sudoku-view.vala | 33 ++++++++++++++++++++++-----------
 1 file changed, 22 insertions(+), 11 deletions(-)
---
diff --git a/src/sudoku-view.vala b/src/sudoku-view.vala
index f8520da..2378bbc 100644
--- a/src/sudoku-view.vala
+++ b/src/sudoku-view.vala
@@ -92,6 +92,7 @@ private class SudokuCellView : DrawingArea
     private NumberPicker earmark_picker;
 
     private EventControllerKey key_controller;      // for keeping in memory
+    private GestureClick click_controller;          // for keeping in memory
 
     public SudokuCellView (int row, int col, ref SudokuGame game)
     {
@@ -99,6 +100,7 @@ private class SudokuCellView : DrawingArea
         this.row = row;
         this.col = col;
 
+        init_mouse ();
         init_keyboard ();
 
         value = game.board [row, col];
@@ -115,33 +117,41 @@ private class SudokuCellView : DrawingArea
         game.cell_changed.connect (cell_changed_cb);
     }
 
-    public override bool button_press_event (EventButton event)
+    private inline void init_mouse ()  // called on construct
     {
-        if (event.button != 1 && event.button != 3)
-            return false;
+        click_controller = new Gtk.GestureClick ();
+        click_controller.set_button (/* all buttons */ 0);
+        click_controller.pressed.connect (on_click);
+        add_controller (click_controller);
+    }
+
+    private inline void on_click (GestureClick _click_controller, int n_press, double event_x, double 
event_y)
+    {
+        uint button = _click_controller.get_current_button ();
+        if (button != Gdk.BUTTON_PRIMARY && button != Gdk.BUTTON_SECONDARY)
+            return;
 
         if (!is_focus)
             grab_focus ();
         if (game.mode == GameMode.PLAY && (is_fixed || game.paused))
-            return false;
+            return;
 
         if (popover != null || earmark_popover != null)
         {
             hide_both_popovers ();
-            return false;
+            return;
         }
 
-        if (event.button == 1)            // Left-Click
+        if (button == Gdk.BUTTON_PRIMARY)       // Left-Click
         {
-            if (!_show_possibilities && (event.state & ModifierType.CONTROL_MASK) > 0 && game.mode == 
GameMode.PLAY)
+            Gdk.ModifierType state = _click_controller.get_current_event_state ();
+            if (!_show_possibilities && (state & ModifierType.CONTROL_MASK) > 0 && game.mode == 
GameMode.PLAY)
                 show_earmark_picker ();
             else
                 show_number_picker ();
         }
-        else if (!_show_possibilities && event.button == 3 && game.mode == GameMode.PLAY)         // 
Right-Click
+        else if (!_show_possibilities && button == Gdk.BUTTON_SECONDARY && game.mode == GameMode.PLAY)      
// Right-Click
             show_earmark_picker ();
-
-        return false;
     }
 
     private void create_earmark_picker ()
@@ -266,8 +276,9 @@ private class SudokuCellView : DrawingArea
 
     private inline void init_keyboard ()  // called on construct
     {
-        key_controller = new EventControllerKey (this);
+        key_controller = new EventControllerKey ();
         key_controller.key_pressed.connect (on_key_pressed);
+        add_controller (key_controller);
     }
 
     private inline bool on_key_pressed (EventControllerKey _key_controller, uint keyval, uint keycode, 
ModifierType state)