[evince/wip/gpoo/gtk4-rebase-port: 45/65] ev-view: form fields support

[Germán Poo-Caamaño <gpoo src gnome org>]

commit ac5c4882aeca736f1970f93905cdc0a347499faf
Author: Qiu Wenbo <qiuwenbo kylinos com cn>
Date:   Fri Aug 20 12:26:23 2021 +0800

    ev-view: form fields support
    
    Signed-off-by: Qiu Wenbo <qiuwenbo kylinos com cn>

 libview/ev-view.c | 176 ++++++++++++++++++++++--------------------------------
 1 file changed, 70 insertions(+), 106 deletions(-)
---
diff --git a/libview/ev-view.c b/libview/ev-view.c
index e6fe41140..f1719963c 100644
--- a/libview/ev-view.c
+++ b/libview/ev-view.c
@@ -2514,7 +2514,7 @@ ev_view_form_field_get_region (EvView      *view,
 static gboolean
 ev_view_forms_remove_widgets (EvView *view)
 {
-       // ev_view_remove_all_form_fields (view);
+       ev_view_remove_all_form_fields (view);
 
        return FALSE;
 }
@@ -2658,27 +2658,24 @@ ev_view_form_field_text_changed (GtkWidget   *widget,
        }
 }
 
-#if 0
-static gboolean
-ev_view_form_field_text_focus_out (GtkWidget     *widget,
-                                  GdkEventFocus *event,
-                                  EvView        *view)
+static void
+ev_view_form_field_text_focus_out (GtkEventControllerFocus     *self,
+                                  EvView                       *view)
 {
+       GtkWidget *widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (self));
        ev_view_form_field_text_save (view, widget);
-
-       return FALSE;
 }
 
-static gboolean
-ev_view_form_field_text_button_pressed (GtkWidget      *widget,
-                                       GdkEventButton *event,
-                                       gpointer        data)
+static void
+ev_view_form_field_text_button_pressed (GtkGestureClick        *self,
+                                       gint n_press,
+                                       gdouble x,
+                                       gdouble y,
+                                       gpointer user_data)
 {
-       return GDK_EVENT_STOP;
+       gtk_gesture_set_state (GTK_GESTURE (self), GTK_EVENT_SEQUENCE_CLAIMED);
 }
 
-#endif
-
 static GtkWidget *
 ev_view_form_field_text_create_widget (EvView      *view,
                                       EvFormField *field)
@@ -2687,6 +2684,7 @@ ev_view_form_field_text_create_widget (EvView      *view,
        GtkWidget       *text = NULL;
        gchar           *txt;
        GtkStyleContext *context;
+       GtkEventController *controller;
 
        txt = ev_document_forms_form_field_text_get_text (EV_DOCUMENT_FORMS (view->document),
                                                          field);
@@ -2694,6 +2692,7 @@ ev_view_form_field_text_create_widget (EvView      *view,
        switch (field_text->type) {
                case EV_FORM_FIELD_TEXT_FILE_SELECT:
                        /* TODO */
+                       return NULL;
                case EV_FORM_FIELD_TEXT_NORMAL:
                        text = gtk_entry_new ();
                        gtk_entry_set_has_frame (GTK_ENTRY (text), FALSE);
@@ -2704,48 +2703,36 @@ ev_view_form_field_text_create_widget (EvView      *view,
                        gtk_entry_set_max_length (GTK_ENTRY (text), field_text->max_len);
                        gtk_entry_set_visibility (GTK_ENTRY (text), !field_text->is_password);
 
-                       if (txt) {
-                               gtk_editable_set_text (GTK_EDITABLE (text), txt);
-                               g_free (txt);
-                       }
-
-#if 0
-                       g_signal_connect (text, "focus-out-event",
-                                         G_CALLBACK (ev_view_form_field_text_focus_out),
-                                         view);
-                       g_signal_connect (text, "changed",
-                                         G_CALLBACK (ev_view_form_field_text_changed),
-                                         field);
                        g_signal_connect_after (text, "activate",
                                                G_CALLBACK (ev_view_form_field_destroy),
                                                view);
-                       g_signal_connect_after (text, "button-press-event",
-                                               G_CALLBACK (ev_view_form_field_text_button_pressed),
-                                               NULL);
-#endif
                        break;
                case EV_FORM_FIELD_TEXT_MULTILINE: {
                        text = gtk_text_view_new ();
-
-                       if (txt) {
-                               gtk_editable_set_text (GTK_EDITABLE (text), txt);
-                               g_free (txt);
-                       }
-#if 0
-                       g_signal_connect (text, "focus-out-event",
-                                         G_CALLBACK (ev_view_form_field_text_focus_out),
-                                         view);
-                       g_signal_connect (buffer, "changed",
-                                         G_CALLBACK (ev_view_form_field_text_changed),
-                                         field);
-                       g_signal_connect_after (text, "button-press-event",
-                                               G_CALLBACK (ev_view_form_field_text_button_pressed),
-                                               NULL);
-#endif
                }
                        break;
        }
 
+       if (txt) {
+               gtk_editable_set_text (GTK_EDITABLE (text), txt);
+               g_free (txt);
+       }
+
+       g_signal_connect (text, "changed",
+                               G_CALLBACK (ev_view_form_field_text_changed),
+                               field);
+
+       controller = GTK_EVENT_CONTROLLER (gtk_event_controller_focus_new ());
+       g_signal_connect (controller, "leave",
+                               G_CALLBACK (ev_view_form_field_text_focus_out),
+                               view);
+       gtk_widget_add_controller (text, controller);
+
+       controller = gtk_gesture_click_new ();
+       g_signal_connect (controller, "pressed",
+                               G_CALLBACK (ev_view_form_field_text_button_pressed), NULL);
+       gtk_widget_add_controller (text, controller);
+
        g_object_weak_ref (G_OBJECT (text),
                           (GWeakNotify)ev_view_form_field_text_save,
                           view);
@@ -4436,6 +4423,23 @@ ev_view_size_allocate (GtkWidget      *widget,
        view->pending_point.x = 0;
        view->pending_point.y = 0;
 
+       for (l = view->children; l && l->data; l = g_list_next (l)) {
+               GdkRectangle view_area;
+               EvViewChild *child = (EvViewChild *)l->data;
+
+               if (!gtk_widget_get_visible (child->widget))
+                       continue;
+
+               _ev_view_transform_doc_rect_to_view_rect (view, child->page, &child->doc_rect, &view_area);
+               view_area.x -= view->scroll_x;
+               view_area.y -= view->scroll_y;
+
+               gtk_widget_set_size_request (child->widget, view_area.width, view_area.height);
+               // TODO: this is a temporary solution to eliminate the warning
+               gtk_widget_measure (child->widget, GTK_ORIENTATION_HORIZONTAL, view_area.width, NULL, NULL, 
NULL, NULL);
+               gtk_widget_size_allocate (child->widget, &view_area, baseline);
+       }
+
        if (view->link_preview.popover)
                gtk_popover_present (GTK_POPOVER (view->link_preview.popover));
 }
@@ -4937,6 +4941,15 @@ static void ev_view_snapshot(GtkWidget *widget, GtkSnapshot *snapshot)
 #endif
        }
 
+       for (GList *l = view->children; l && l->data; l = g_list_next (l)) {
+               EvViewChild *child = (EvViewChild *)l->data;
+
+               if (!gtk_widget_get_visible (child->widget))
+                       continue;
+
+               gtk_widget_snapshot_child (GTK_WIDGET (view), child->widget, snapshot);
+       }
+
        gtk_snapshot_pop (snapshot);
 
 }
@@ -4963,7 +4976,7 @@ ev_view_set_focused_element_at_location (EvView *view,
        }
 
        if ((field = ev_view_get_form_field_at_location (view, x, y))) {
-               // ev_view_remove_all_form_fields (view);
+               ev_view_remove_all_form_fields (view);
                _ev_view_focus_form_field (view, field);
                return;
        }
@@ -5563,7 +5576,7 @@ ev_view_button_press_event (GtkGestureClick       *gesture,
                                        view->moving_annot_info.cursor_offset.y = doc_point.y - 
current_area.y1;
                                }
                        } else if ((field = ev_view_get_form_field_at_location (view, x, y))) {
-                               // ev_view_remove_all_form_fields (view);
+                               ev_view_remove_all_form_fields (view);
                                ev_view_handle_form_field (view, field);
                        } else if ((link = get_link_mapping_at_location (view, x, y, &page))){
                                _ev_view_set_focused_element (view, link, page);
@@ -5577,7 +5590,7 @@ ev_view_button_press_event (GtkGestureClick       *gesture,
                                view->image_dnd_info.start.x = x + view->scroll_x;
                                view->image_dnd_info.start.y = y + view->scroll_y;
                        } else {
-                               // ev_view_remove_all_form_fields (view);
+                               ev_view_remove_all_form_fields (view);
                                _ev_view_set_focused_element (view, NULL, -1);
 
                                if (view->synctex_result) {
@@ -5760,26 +5773,21 @@ on_middle_clicked_drag_update (GtkGestureDrag   *self,
        view->drag_info.buffer[0].y = y;
 }
 
-#if 0
-static void
-ev_view_remove_all (EvView *view)
+static void remove_ev_view_child (EvViewChild *child)
 {
-       gtk_container_foreach (GTK_CONTAINER (view), (GtkCallback) gtk_widget_destroy, NULL);
-}
-
-static void
-destroy_child_if_form_widget (GtkWidget *widget)
-{
-       if (g_object_get_data (G_OBJECT (widget), "form-field"))
-               gtk_widget_destroy (widget);
+       gtk_widget_unparent (child->widget);
+       g_slice_free (EvViewChild, child);
 }
 
 static void
 ev_view_remove_all_form_fields (EvView *view)
 {
-       gtk_container_foreach (GTK_CONTAINER (view), (GtkCallback)destroy_child_if_form_widget, NULL);
+       g_list_free_full (view->children, remove_ev_view_child);
+       view->children = NULL;
+       gtk_widget_queue_draw (GTK_WIDGET (view));
 }
 
+#if 0
 /*** Drag and Drop ***/
 static void
 ev_view_drag_data_get (GtkWidget        *widget,
@@ -7583,50 +7591,6 @@ ev_view_get_accessible (GtkWidget *widget)
        return view->accessible;
 }
 
-/* GtkContainer */
-static void
-ev_view_remove (GtkContainer *container,
-               GtkWidget    *widget)
-{
-       EvView *view = EV_VIEW (container);
-       GList *tmp_list = view->children;
-       EvViewChild *child;
-
-       while (tmp_list) {
-               child = tmp_list->data;
-
-               if (child->widget == widget) {
-                       gtk_widget_unparent (widget);
-
-                       view->children = g_list_remove_link (view->children, tmp_list);
-                       g_list_free_1 (tmp_list);
-                       g_slice_free (EvViewChild, child);
-
-                       return;
-               }
-
-               tmp_list = tmp_list->next;
-       }
-}
-
-static void
-ev_view_forall (GtkContainer *container,
-               gboolean      include_internals,
-               GtkCallback   callback,
-               gpointer      callback_data)
-{
-       EvView *view = EV_VIEW (container);
-       GList *tmp_list = view->children;
-       EvViewChild *child;
-
-       while (tmp_list) {
-               child = tmp_list->data;
-               tmp_list = tmp_list->next;
-
-               (* callback) (child->widget, callback_data);
-       }
-}
-
 #endif
 
 static void