Autoscroll feature with the context menu. Fixes bug #323670. Thanks to

[evince.git] / shell / ev-view.c

diff --git a/shell/ev-view.c b/shell/ev-view.c
index bbfeecfa64d2b4acb153f331b32813a44120a07a..c4baa7c19a5131ff492a16c4f8813032eb1e5410 100644 (file)
--- a/shell/ev-view.c
+++ b/shell/ev-view.c
@@ -1521,6 +1521,12 @@ ev_view_handle_cursor_over_xy (EvView *view, gint x, gint y)
                        ev_view_set_cursor (view, EV_VIEW_CURSOR_DRAG);
                return;
        }
+
+       if (view->scroll_info.autoscrolling) {
+               if (view->cursor != EV_VIEW_CURSOR_AUTOSCROLL)
+                       ev_view_set_cursor (view, EV_VIEW_CURSOR_AUTOSCROLL);
+               return;
+       }
        
        link = ev_view_get_link_at_location (view, x, y);
        
@@ -2663,6 +2669,12 @@ ev_view_button_press_event (GtkWidget      *widget,
        
        switch (event->button) {
                case 1: {
+
+                       if (view->scroll_info.autoscrolling == TRUE) {
+                               view->scroll_info.autoscrolling = FALSE;
+                               return TRUE;
+                       }
+
                        EvImage *image;
                        EvFormField *field;
 
@@ -2701,6 +2713,10 @@ ev_view_button_press_event (GtkWidget      *widget,
                case 2:
                        /* use root coordinates as reference point because
                         * scrolling changes window relative coordinates */
+                       if (view->scroll_info.autoscrolling == TRUE) {
+                               view->scroll_info.autoscrolling = FALSE;
+                               return TRUE;
+                       }
                        view->drag_info.start.x = event->x_root;
                        view->drag_info.start.y = event->y_root;
                        view->drag_info.hadj = gtk_adjustment_get_value (view->hadjustment);
@@ -2710,6 +2726,8 @@ ev_view_button_press_event (GtkWidget      *widget,
 
                        return TRUE;
                case 3:
+                       if (!view->scroll_info.autoscrolling)
+                               view->scroll_info.start_y = event->y;
                        return ev_view_do_popup_menu (view, event->x, event->y);
        }
        
@@ -2883,6 +2901,7 @@ ev_view_motion_notify_event (GtkWidget      *widget,
 
        if (!view->document)
                return FALSE;
+       
                
         if (event->is_hint || event->window != view->layout.bin_window) {
            gtk_widget_get_pointer (widget, &x, &y);
@@ -2891,6 +2910,10 @@ ev_view_motion_notify_event (GtkWidget      *widget,
            y = event->y;
        }
 
+       if (view->scroll_info.autoscrolling) {
+               view->scroll_info.last_y = y;
+       }
+
        if (view->selection_info.in_drag) {
                if (gtk_drag_check_threshold (widget,
                                              view->selection_info.start.x,
@@ -3025,6 +3048,10 @@ ev_view_button_release_event (GtkWidget      *widget,
            g_source_remove (view->selection_scroll_id);
            view->selection_scroll_id = 0;
        }
+       if (view->scroll_info.timeout_id) {
+           g_source_remove (view->scroll_info.timeout_id);
+           view->scroll_info.timeout_id = 0;
+       }
        if (view->selection_update_id) {
            g_source_remove (view->selection_update_id);
            view->selection_update_id = 0;
@@ -4042,6 +4069,7 @@ ev_view_init (EvView *view)
        view->pressed_button = -1;
        view->cursor = EV_VIEW_CURSOR_NORMAL;
        view->drag_info.in_drag = FALSE;
+       view->scroll_info.autoscrolling = FALSE;
        view->selection_info.selections = NULL;
        view->selection_info.in_selection = FALSE;
        view->selection_info.in_drag = FALSE;
@@ -4222,6 +4250,45 @@ ev_view_set_loading (EvView        *view,
        gtk_widget_queue_draw (GTK_WIDGET (view));
 }
 
+static gboolean ev_view_autoscroll_cb (EvView *view)
+{
+       gdouble speed, value;
+
+       /* If the user stops autoscrolling, autoscrolling will be
+        * set to false but the timeout will continue; stop the timeout: */
+       if (!view->scroll_info.autoscrolling) {
+               view->scroll_info.timeout_id = 0;
+               return FALSE;
+       }
+       
+       if (view->scroll_info.last_y > view->scroll_info.start_y && 
+               (view->scroll_info.last_y < view->scroll_info.start_y))
+               return TRUE; 
+
+       /* Replace 100 with your speed of choice: The lower the faster.
+        * Replace 3 with another speed of choice: The higher, the faster it accelerated
+        *      based on the distance of the starting point from the mouse
+        * (All also effected by the timeout interval of this callback) */
+
+       if (view->scroll_info.start_y > view->scroll_info.last_y)
+               speed = -pow ((((gdouble)view->scroll_info.start_y - view->scroll_info.last_y) / 100), 3);
+       else
+               speed = pow ((((gdouble)view->scroll_info.last_y - view->scroll_info.start_y) / 100), 3);
+       
+       value = gtk_adjustment_get_value (view->vadjustment);
+       value = CLAMP (value + speed, 0, view->vadjustment->upper - view->vadjustment->page_size);
+       gtk_adjustment_set_value (view->vadjustment, value);
+       
+       return TRUE;
+
+}
+
+void ev_view_autoscroll(EvView *view)
+{
+       view->scroll_info.autoscrolling = TRUE;
+       view->scroll_info.timeout_id = g_timeout_add (20, (GSourceFunc)(ev_view_autoscroll_cb), view);
+}
+
 void
 ev_view_set_document (EvView     *view,
                      EvDocument *document)
@@ -5563,6 +5630,9 @@ ev_view_set_cursor (EvView *view, EvViewCursor new_cursor)
                case EV_VIEW_CURSOR_DRAG:
                        cursor = gdk_cursor_new_for_display (display, GDK_FLEUR);
                        break;
+               case EV_VIEW_CURSOR_AUTOSCROLL:
+                       cursor = gdk_cursor_new_for_display (display, GDK_DOUBLE_ARROW);
+                       break;
        }
 
        if (cursor) {