texthandle: Set a bigger input shape, covering the line height

Now, even if the handles being rendered are small, the handle touch
input shape will be as wide as the visible part of the rendered asset, and
high enough to cover both the handle and the height of the line where
the selection bound is.

Also, make handles have the same virtual distance to the line top/bottom
when a drag starts, so the handle doesn't jump to another line after a
too short threshold.

1 files changed, 30 insertions, 3 deletions

diff --git a/gtk/gtktexthandle.c b/gtk/gtktexthandle.c
index fd1d966482..bb0f851535 100644
--- a/gtk/gtktexthandle.c
+++ b/gtk/gtktexthandle.c
@@ -106,6 +106,9 @@ _gtk_text_handle_draw (GtkTextHandle         *handle,
   cairo_set_source_rgba (cr, 0, 0, 0, 0);
   cairo_paint (cr);
 
+  if (pos == GTK_TEXT_HANDLE_POSITION_SELECTION_END)
+    cairo_translate (cr, 0, priv->windows[pos].pointing_to.height);
+
   gtk_style_context_save (priv->style_context);
   gtk_style_context_add_class (priv->style_context,
                                GTK_STYLE_CLASS_CURSOR_HANDLE);
@@ -136,6 +139,7 @@ _gtk_text_handle_update_shape (GtkTextHandle         *handle,
                                GtkTextHandlePosition  pos)
 {
   GtkTextHandlePrivate *priv;
+  cairo_rectangle_int_t rect;
   cairo_surface_t *surface;
   cairo_region_t *region;
   cairo_t *cr;
@@ -159,6 +163,15 @@ _gtk_text_handle_update_shape (GtkTextHandle         *handle,
   else
     gdk_window_shape_combine_region (window, region, 0, 0);
 
+  cairo_region_get_extents (region, &rect);
+  cairo_region_destroy (region);
+
+  /* Preserve x/width, but extend input shape
+   * vertically to all window height */
+  rect.y = 0;
+  rect.height = gdk_window_get_height (window);
+  region = cairo_region_create_rectangle (&rect);
+
   gdk_window_input_shape_combine_region (window, region, 0, 0);
 
   cairo_surface_destroy (surface);
@@ -278,6 +291,8 @@ gtk_text_handle_widget_event (GtkWidget     *widget,
       if (pos == GTK_TEXT_HANDLE_POSITION_SELECTION_START)
         y += height;
 
+      y += priv->windows[pos].pointing_to.height / 2;
+
       g_signal_emit (handle, signals[HANDLE_DRAGGED], 0, pos, x, y);
     }
 
@@ -306,11 +321,10 @@ _gtk_text_handle_update_window_state (GtkTextHandle         *handle,
       y = handle_window->pointing_to.y;
       _gtk_text_handle_get_size (handle, &width, &height);
 
-      if (pos == GTK_TEXT_HANDLE_POSITION_CURSOR)
-        y += handle_window->pointing_to.height;
-      else
+      if (pos != GTK_TEXT_HANDLE_POSITION_CURSOR)
         y -= height;
 
+      height += handle_window->pointing_to.height;
       x -= width / 2;
 
       gdk_window_move_resize (handle_window->window, x, y, width, height);
@@ -628,6 +642,9 @@ _gtk_text_handle_set_mode (GtkTextHandle     *handle,
   _gtk_text_handle_update_shape (handle,
                                  priv->windows[GTK_TEXT_HANDLE_POSITION_CURSOR].window,
                                  GTK_TEXT_HANDLE_POSITION_CURSOR);
+  _gtk_text_handle_update_shape (handle,
+                                 priv->windows[GTK_TEXT_HANDLE_POSITION_SELECTION_START].window,
+                                 GTK_TEXT_HANDLE_POSITION_SELECTION_START);
 
   _gtk_text_handle_update_window_state (handle, GTK_TEXT_HANDLE_POSITION_SELECTION_START);
   _gtk_text_handle_update_window_state (handle, GTK_TEXT_HANDLE_POSITION_SELECTION_END);
@@ -651,6 +668,7 @@ _gtk_text_handle_set_position (GtkTextHandle         *handle,
 {
   GtkTextHandlePrivate *priv;
   HandleWindow *handle_window;
+  gboolean size_changed;
 
   g_return_if_fail (GTK_IS_TEXT_HANDLE (handle));
 
@@ -667,6 +685,9 @@ _gtk_text_handle_set_position (GtkTextHandle         *handle,
        pos != GTK_TEXT_HANDLE_POSITION_CURSOR))
     return;
 
+  size_changed = (rect->width != handle_window->pointing_to.width ||
+                  rect->height != handle_window->pointing_to.height);
+
   handle_window->pointing_to = *rect;
   handle_window->has_point = TRUE;
   gdk_window_get_root_coords (priv->relative_to,
@@ -675,6 +696,9 @@ _gtk_text_handle_set_position (GtkTextHandle         *handle,
                               &handle_window->pointing_to.y);
 
   _gtk_text_handle_update_window_state (handle, pos);
+
+  if (size_changed)
+    _gtk_text_handle_update_shape (handle, handle_window->window, pos);
 }
 
 void
@@ -699,6 +723,9 @@ _gtk_text_handle_set_visible (GtkTextHandle         *handle,
   if (!window)
     return;
 
+  if (!gdk_window_is_visible (window))
+    _gtk_text_handle_update_shape (handle, window, pos);
+
   priv->windows[pos].user_visible = visible;
   _gtk_text_handle_update_window_state (handle, pos);
 }