Adding upstream version 43.9.upstream/43.9upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 600 insertions, 0 deletions

diff --git a/src/st/st-viewport.c b/src/st/st-viewport.c
new file mode 100644
index 0000000..e6b9127
--- /dev/null
+++ b/src/st/st-viewport.c
@@ -0,0 +1,600 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/*
+ * st-scrollable-wiget.c: a scrollable actor
+ *
+ * Copyright 2009 Intel Corporation.
+ * Copyright 2009 Abderrahim Kitouni
+ * Copyright 2009, 2010 Red Hat, Inc.
+ * Copyright 2010 Florian Muellner
+ * Copyright 2019 Endless, Inc
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU Lesser General Public License,
+ * version 2.1, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Portions copied from Clutter:
+ * Clutter.
+ *
+ * An OpenGL based 'interactive canvas' library.
+ *
+ * Authored By Matthew Allum  <mallum@openedhand.com>
+ *
+ * Copyright (C) 2006 OpenedHand
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ */
+
+/**
+ * SECTION:st-viewport
+ * @short_description: a scrollable container
+ *
+ * The #StViewport is a generic #StScrollable implementation.
+ *
+ */
+
+#include <stdlib.h>
+
+#include "st-viewport.h"
+
+#include "st-private.h"
+#include "st-scrollable.h"
+
+
+static void st_viewport_scrollable_interface_init (StScrollableInterface *iface);
+
+enum {
+  PROP_0,
+
+  PROP_CLIP_TO_VIEW,
+
+  N_PROPS,
+
+  /* StScrollable */
+  PROP_HADJUST,
+  PROP_VADJUST
+};
+
+static GParamSpec *props[N_PROPS] = { NULL, };
+
+typedef struct
+{
+  StAdjustment *hadjustment;
+  StAdjustment *vadjustment;
+  gboolean clip_to_view;
+} StViewportPrivate;
+
+G_DEFINE_TYPE_WITH_CODE (StViewport, st_viewport, ST_TYPE_WIDGET,
+                         G_ADD_PRIVATE (StViewport)
+                         G_IMPLEMENT_INTERFACE (ST_TYPE_SCROLLABLE,
+                                                st_viewport_scrollable_interface_init));
+
+/*
+ * StScrollable Interface Implementation
+ */
+static void
+adjustment_value_notify_cb (StAdjustment *adjustment,
+                            GParamSpec   *pspec,
+                            StViewport   *viewport)
+{
+  clutter_actor_invalidate_transform (CLUTTER_ACTOR (viewport));
+  clutter_actor_invalidate_paint_volume (CLUTTER_ACTOR (viewport));
+  clutter_actor_queue_relayout (CLUTTER_ACTOR (viewport));
+}
+
+static void
+scrollable_set_adjustments (StScrollable *scrollable,
+                            StAdjustment *hadjustment,
+                            StAdjustment *vadjustment)
+{
+  StViewport *viewport = ST_VIEWPORT (scrollable);
+  StViewportPrivate *priv =
+    st_viewport_get_instance_private (viewport);
+
+  g_object_freeze_notify (G_OBJECT (scrollable));
+
+  if (hadjustment != priv->hadjustment)
+    {
+      if (priv->hadjustment)
+        {
+          g_signal_handlers_disconnect_by_func (priv->hadjustment,
+                                                adjustment_value_notify_cb,
+                                                scrollable);
+          g_object_unref (priv->hadjustment);
+        }
+
+      if (hadjustment)
+        {
+          g_object_ref (hadjustment);
+          g_signal_connect (hadjustment, "notify::value",
+                            G_CALLBACK (adjustment_value_notify_cb),
+                            scrollable);
+        }
+
+      priv->hadjustment = hadjustment;
+      g_object_notify (G_OBJECT (scrollable), "hadjustment");
+    }
+
+  if (vadjustment != priv->vadjustment)
+    {
+      if (priv->vadjustment)
+        {
+          g_signal_handlers_disconnect_by_func (priv->vadjustment,
+                                                adjustment_value_notify_cb,
+                                                scrollable);
+          g_object_unref (priv->vadjustment);
+        }
+
+      if (vadjustment)
+        {
+          g_object_ref (vadjustment);
+          g_signal_connect (vadjustment, "notify::value",
+                            G_CALLBACK (adjustment_value_notify_cb),
+                            scrollable);
+        }
+
+      priv->vadjustment = vadjustment;
+      g_object_notify (G_OBJECT (scrollable), "vadjustment");
+    }
+
+  g_object_thaw_notify (G_OBJECT (scrollable));
+}
+
+static void
+scrollable_get_adjustments (StScrollable  *scrollable,
+                            StAdjustment **hadjustment,
+                            StAdjustment **vadjustment)
+{
+  StViewport *viewport = ST_VIEWPORT (scrollable);
+  StViewportPrivate *priv =
+    st_viewport_get_instance_private (viewport);
+
+  if (hadjustment)
+    *hadjustment = priv->hadjustment;
+
+  if (vadjustment)
+    *vadjustment = priv->vadjustment;
+}
+
+static void
+st_viewport_scrollable_interface_init (StScrollableInterface *iface)
+{
+  iface->set_adjustments = scrollable_set_adjustments;
+  iface->get_adjustments = scrollable_get_adjustments;
+}
+
+static void
+st_viewport_set_clip_to_view (StViewport *viewport,
+                              gboolean    clip_to_view)
+{
+  StViewportPrivate *priv =
+    st_viewport_get_instance_private (viewport);
+
+  if (!!priv->clip_to_view != !!clip_to_view)
+    {
+      priv->clip_to_view = clip_to_view;
+      clutter_actor_queue_redraw (CLUTTER_ACTOR (viewport));
+      g_object_notify_by_pspec (G_OBJECT (viewport), props[PROP_CLIP_TO_VIEW]);
+    }
+}
+
+static void
+st_viewport_get_property (GObject    *object,
+                          guint       property_id,
+                          GValue     *value,
+                          GParamSpec *pspec)
+{
+  StViewportPrivate *priv =
+    st_viewport_get_instance_private (ST_VIEWPORT (object));
+  StAdjustment *adjustment;
+
+  switch (property_id)
+    {
+    case PROP_HADJUST:
+      scrollable_get_adjustments (ST_SCROLLABLE (object), &adjustment, NULL);
+      g_value_set_object (value, adjustment);
+      break;
+
+    case PROP_VADJUST:
+      scrollable_get_adjustments (ST_SCROLLABLE (object), NULL, &adjustment);
+      g_value_set_object (value, adjustment);
+      break;
+
+    case PROP_CLIP_TO_VIEW:
+      g_value_set_boolean (value, priv->clip_to_view);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
+
+static void
+st_viewport_set_property (GObject      *object,
+                          guint         property_id,
+                          const GValue *value,
+                          GParamSpec   *pspec)
+{
+  StViewport *viewport = ST_VIEWPORT (object);
+  StViewportPrivate *priv =
+    st_viewport_get_instance_private (viewport);
+
+  switch (property_id)
+    {
+    case PROP_HADJUST:
+      scrollable_set_adjustments (ST_SCROLLABLE (object),
+                                  g_value_get_object (value),
+                                  priv->vadjustment);
+      break;
+
+    case PROP_VADJUST:
+      scrollable_set_adjustments (ST_SCROLLABLE (object),
+                                  priv->hadjustment,
+                                  g_value_get_object (value));
+      break;
+
+    case PROP_CLIP_TO_VIEW:
+      st_viewport_set_clip_to_view (viewport, g_value_get_boolean (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
+
+static void
+st_viewport_dispose (GObject *object)
+{
+  StViewport *viewport = ST_VIEWPORT (object);
+  StViewportPrivate *priv =
+    st_viewport_get_instance_private (viewport);
+
+  g_clear_object (&priv->hadjustment);
+  g_clear_object (&priv->vadjustment);
+
+  G_OBJECT_CLASS (st_viewport_parent_class)->dispose (object);
+}
+
+static void
+st_viewport_allocate (ClutterActor           *actor,
+                      const ClutterActorBox  *box)
+{
+  StViewport *viewport = ST_VIEWPORT (actor);
+  StViewportPrivate *priv =
+    st_viewport_get_instance_private (viewport);
+  StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (actor));
+  ClutterLayoutManager *layout = clutter_actor_get_layout_manager (actor);
+  ClutterActorBox viewport_box;
+  ClutterActorBox content_box;
+  float avail_width, avail_height;
+  float min_width, natural_width;
+  float min_height, natural_height;
+
+  st_theme_node_get_content_box (theme_node, box, &viewport_box);
+  clutter_actor_box_get_size (&viewport_box, &avail_width, &avail_height);
+
+  clutter_layout_manager_get_preferred_width (layout, CLUTTER_CONTAINER (actor),
+                                              avail_height,
+                                              &min_width, &natural_width);
+  clutter_layout_manager_get_preferred_height (layout, CLUTTER_CONTAINER (actor),
+                                               MAX (avail_width, min_width),
+                                               &min_height, &natural_height);
+
+  /* Because StViewport implements StScrollable, the allocation box passed here
+   * may not match the minimum sizes reported by the layout manager. When that
+   * happens, the content box needs to be adjusted to match the reported minimum
+   * sizes before being passed to clutter_layout_manager_allocate() */
+  clutter_actor_set_allocation (actor, box);
+
+  content_box = viewport_box;
+  if (priv->hadjustment)
+    content_box.x2 += MAX (0, min_width - avail_width);
+  if (priv->vadjustment)
+    content_box.y2 += MAX (0, min_height - avail_height);
+
+  clutter_layout_manager_allocate (layout, CLUTTER_CONTAINER (actor),
+                                   &content_box);
+
+  /* update adjustments for scrolling */
+  if (priv->vadjustment)
+    {
+      double prev_value;
+
+      g_object_set (G_OBJECT (priv->vadjustment),
+                    "lower", 0.0,
+                    "upper", MAX (min_height, avail_height),
+                    "page-size", avail_height,
+                    "step-increment", avail_height / 6,
+                    "page-increment", avail_height - avail_height / 6,
+                    NULL);
+
+      prev_value = st_adjustment_get_value (priv->vadjustment);
+      st_adjustment_set_value (priv->vadjustment, prev_value);
+    }
+
+  if (priv->hadjustment)
+    {
+      double prev_value;
+
+      g_object_set (G_OBJECT (priv->hadjustment),
+                    "lower", 0.0,
+                    "upper", MAX (min_width, avail_width),
+                    "page-size", avail_width,
+                    "step-increment", avail_width / 6,
+                    "page-increment", avail_width - avail_width / 6,
+                    NULL);
+
+      prev_value = st_adjustment_get_value (priv->hadjustment);
+      st_adjustment_set_value (priv->hadjustment, prev_value);
+    }
+}
+
+static double
+get_hadjustment_value (StViewport *viewport)
+{
+  StViewportPrivate *priv = st_viewport_get_instance_private (viewport);
+  ClutterTextDirection direction;
+  double x, upper, page_size;
+
+  if (!priv->hadjustment)
+    return 0;
+
+  st_adjustment_get_values (priv->hadjustment,
+                            &x, NULL, &upper, NULL, NULL, &page_size);
+
+  direction = clutter_actor_get_text_direction (CLUTTER_ACTOR (viewport));
+  if (direction == CLUTTER_TEXT_DIRECTION_RTL)
+    return upper - page_size - x;
+
+  return x;
+}
+
+static void
+st_viewport_apply_transform (ClutterActor      *actor,
+                             graphene_matrix_t *matrix)
+{
+  StViewport *viewport = ST_VIEWPORT (actor);
+  StViewportPrivate *priv = st_viewport_get_instance_private (viewport);
+  ClutterActorClass *parent_class =
+    CLUTTER_ACTOR_CLASS (st_viewport_parent_class);
+  graphene_point3d_t p = GRAPHENE_POINT3D_INIT_ZERO;
+
+  if (priv->hadjustment)
+    p.x = -(int)get_hadjustment_value (viewport);
+
+  if (priv->vadjustment)
+    p.y = -(int)st_adjustment_get_value (priv->vadjustment);
+
+  graphene_matrix_translate (matrix, &p);
+
+  parent_class->apply_transform (actor, matrix);
+}
+
+/* If we are translated, then we need to translate back before chaining
+ * up or the background and borders will be drawn in the wrong place */
+static void
+get_border_paint_offsets (StViewport *viewport,
+                          int        *x,
+                          int        *y)
+{
+  StViewportPrivate *priv = st_viewport_get_instance_private (viewport);
+
+  if (priv->hadjustment)
+    *x = get_hadjustment_value (viewport);
+  else
+    *x = 0;
+
+  if (priv->vadjustment)
+    *y = st_adjustment_get_value (priv->vadjustment);
+  else
+    *y = 0;
+}
+
+
+static void
+st_viewport_paint (ClutterActor        *actor,
+                   ClutterPaintContext *paint_context)
+{
+  StViewport *viewport = ST_VIEWPORT (actor);
+  StViewportPrivate *priv = st_viewport_get_instance_private (viewport);
+  StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (actor));
+  int x, y;
+  ClutterActorBox allocation_box;
+  ClutterActorBox content_box;
+  ClutterActor *child;
+  CoglFramebuffer *fb = clutter_paint_context_get_framebuffer (paint_context);
+
+  get_border_paint_offsets (viewport, &x, &y);
+  if (x != 0 || y != 0)
+    {
+      cogl_framebuffer_push_matrix (fb);
+      cogl_framebuffer_translate (fb, x, y, 0);
+    }
+
+  st_widget_paint_background (ST_WIDGET (actor), paint_context);
+
+  if (x != 0 || y != 0)
+    cogl_framebuffer_pop_matrix (fb);
+
+  if (clutter_actor_get_n_children (actor) == 0)
+    return;
+
+  clutter_actor_get_allocation_box (actor, &allocation_box);
+  st_theme_node_get_content_box (theme_node, &allocation_box, &content_box);
+
+  content_box.x1 += x;
+  content_box.y1 += y;
+  content_box.x2 += x;
+  content_box.y2 += y;
+
+  /* The content area forms the viewport into the scrolled contents, while
+   * the borders and background stay in place; after drawing the borders and
+   * background, we clip to the content area */
+  if (priv->clip_to_view && (priv->hadjustment || priv->vadjustment))
+    {
+      cogl_framebuffer_push_rectangle_clip (fb,
+                                            (int)content_box.x1,
+                                            (int)content_box.y1,
+                                            (int)content_box.x2,
+                                            (int)content_box.y2);
+    }
+
+  for (child = clutter_actor_get_first_child (actor);
+       child != NULL;
+       child = clutter_actor_get_next_sibling (child))
+    clutter_actor_paint (child, paint_context);
+
+  if (priv->clip_to_view && (priv->hadjustment || priv->vadjustment))
+    cogl_framebuffer_pop_clip (fb);
+}
+
+static void
+st_viewport_pick (ClutterActor       *actor,
+                  ClutterPickContext *pick_context)
+{
+  StViewport *viewport = ST_VIEWPORT (actor);
+  StViewportPrivate *priv = st_viewport_get_instance_private (viewport);
+  StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (actor));
+  int x, y;
+  g_autoptr (ClutterActorBox) allocation_box = NULL;
+  ClutterActorBox content_box;
+  ClutterActor *child;
+
+  CLUTTER_ACTOR_CLASS (st_viewport_parent_class)->pick (actor, pick_context);
+
+  if (clutter_actor_get_n_children (actor) == 0)
+    return;
+
+  g_object_get (actor, "allocation", &allocation_box, NULL);
+  st_theme_node_get_content_box (theme_node, allocation_box, &content_box);
+
+  get_border_paint_offsets (viewport, &x, &y);
+
+  content_box.x1 += x;
+  content_box.y1 += y;
+  content_box.x2 += x;
+  content_box.y2 += y;
+
+  if (priv->hadjustment || priv->vadjustment)
+    clutter_pick_context_push_clip (pick_context, &content_box);
+
+  for (child = clutter_actor_get_first_child (actor);
+       child != NULL;
+       child = clutter_actor_get_next_sibling (child))
+    clutter_actor_pick (child, pick_context);
+
+  if (priv->hadjustment || priv->vadjustment)
+    clutter_pick_context_pop_clip (pick_context);
+}
+
+static gboolean
+st_viewport_get_paint_volume (ClutterActor       *actor,
+                              ClutterPaintVolume *volume)
+{
+  StViewport *viewport = ST_VIEWPORT (actor);
+  StViewportPrivate *priv = st_viewport_get_instance_private (viewport);
+  StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (actor));
+  ClutterActorBox allocation_box;
+  ClutterActorBox content_box;
+  int x, y;
+
+  /* Setting the paint volume does not make sense when we don't have any allocation */
+  if (!clutter_actor_has_allocation (actor))
+    return FALSE;
+
+  if (!priv->clip_to_view)
+    return CLUTTER_ACTOR_CLASS (st_viewport_parent_class)->get_paint_volume (actor, volume);
+
+  /* When have an adjustment we are clipped to the content box, so base
+   * our paint volume on that. */
+  if (priv->hadjustment || priv->vadjustment)
+    {
+      double width, height;
+
+      clutter_actor_get_allocation_box (actor, &allocation_box);
+      st_theme_node_get_content_box (theme_node, &allocation_box, &content_box);
+
+      width = content_box.x2 - content_box.x1;
+      height = content_box.y2 - content_box.y1;
+
+      clutter_paint_volume_set_width (volume, width);
+      clutter_paint_volume_set_height (volume, height);
+    }
+  else if (!CLUTTER_ACTOR_CLASS (st_viewport_parent_class)->get_paint_volume (actor, volume))
+    {
+      return FALSE;
+    }
+
+  /* When scrolled, st_viewport_apply_transform() includes the scroll offset
+   * and affects paint volumes. This is right for our children, but our paint volume
+   * is determined by our allocation and borders and doesn't scroll, so we need
+   * to reverse-compensate here, the same as we do when painting.
+   */
+  get_border_paint_offsets (viewport, &x, &y);
+  if (x != 0 || y != 0)
+    {
+      graphene_point3d_t origin;
+
+      clutter_paint_volume_get_origin (volume, &origin);
+      origin.x += x;
+      origin.y += y;
+      clutter_paint_volume_set_origin (volume, &origin);
+    }
+
+  return TRUE;
+}
+
+static void
+st_viewport_class_init (StViewportClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
+
+  object_class->get_property = st_viewport_get_property;
+  object_class->set_property = st_viewport_set_property;
+  object_class->dispose = st_viewport_dispose;
+
+  actor_class->allocate = st_viewport_allocate;
+  actor_class->apply_transform = st_viewport_apply_transform;
+
+  actor_class->paint = st_viewport_paint;
+  actor_class->get_paint_volume = st_viewport_get_paint_volume;
+  actor_class->pick = st_viewport_pick;
+
+  props[PROP_CLIP_TO_VIEW] =
+    g_param_spec_boolean ("clip-to-view",
+                          "Clip to view",
+                          "Clip to view",
+                          TRUE,
+                          ST_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
+
+  /* StScrollable properties */
+  g_object_class_override_property (object_class,
+                                    PROP_HADJUST,
+                                    "hadjustment");
+
+  g_object_class_override_property (object_class,
+                                    PROP_VADJUST,
+                                    "vadjustment");
+
+  g_object_class_install_properties (object_class, N_PROPS, props);
+}
+
+static void
+st_viewport_init (StViewport *self)
+{
+  StViewportPrivate *priv =
+    st_viewport_get_instance_private (self);
+
+  priv->clip_to_view = TRUE;
+}