static void st_scroll_view_fade_dispose (GObject *gobject) { StScrollViewFade *self = ST_SCROLL_VIEW_FADE (gobject); if (self->program != COGL_INVALID_HANDLE) { cogl_handle_unref (self->program); self->program = COGL_INVALID_HANDLE; self->shader = COGL_INVALID_HANDLE; } if (self->vadjustment) { g_signal_handlers_disconnect_by_func (self->vadjustment, (gpointer)on_vadjustment_changed, self); self->vadjustment = NULL; } self->actor = NULL; G_OBJECT_CLASS (st_scroll_view_fade_parent_class)->dispose (gobject); }
static void st_scroll_view_fade_set_actor (ClutterActorMeta *meta, ClutterActor *actor) { StScrollViewFade *self = ST_SCROLL_VIEW_FADE (meta); ClutterActorMetaClass *parent; g_return_if_fail (actor == NULL || ST_IS_SCROLL_VIEW (actor)); if (self->shader == COGL_INVALID_HANDLE) { clutter_actor_meta_set_enabled (meta, FALSE); return; } if (self->vadjustment) { g_signal_handlers_disconnect_by_func (self->vadjustment, (gpointer)on_adjustment_changed, self); self->vadjustment = NULL; } if (self->hadjustment) { g_signal_handlers_disconnect_by_func (self->hadjustment, (gpointer)on_adjustment_changed, self); self->hadjustment = NULL; } if (actor) { StScrollView *scroll_view = ST_SCROLL_VIEW (actor); StScrollBar *vscroll = ST_SCROLL_BAR (st_scroll_view_get_vscroll_bar (scroll_view)); StScrollBar *hscroll = ST_SCROLL_BAR (st_scroll_view_get_hscroll_bar (scroll_view)); self->vadjustment = ST_ADJUSTMENT (st_scroll_bar_get_adjustment (vscroll)); self->hadjustment = ST_ADJUSTMENT (st_scroll_bar_get_adjustment (hscroll)); g_signal_connect (self->vadjustment, "changed", G_CALLBACK (on_adjustment_changed), self); g_signal_connect (self->hadjustment, "changed", G_CALLBACK (on_adjustment_changed), self); on_adjustment_changed (NULL, CLUTTER_EFFECT (self)); } parent = CLUTTER_ACTOR_META_CLASS (st_scroll_view_fade_parent_class); parent->set_actor (meta, actor); /* we keep a back pointer here, to avoid going through the ActorMeta */ self->actor = clutter_actor_meta_get_actor (meta); }
static void st_scroll_view_fade_paint_target (ClutterOffscreenEffect *effect) { StScrollViewFade *self = ST_SCROLL_VIEW_FADE (effect); ClutterOffscreenEffectClass *parent; CoglHandle material; gdouble value, lower, upper, page_size; ClutterActor *vscroll = st_scroll_view_get_vscroll_bar (ST_SCROLL_VIEW (self->actor)); ClutterActor *hscroll = st_scroll_view_get_hscroll_bar (ST_SCROLL_VIEW (self->actor)); gboolean h_scroll_visible, v_scroll_visible; g_object_get (ST_SCROLL_VIEW (self->actor), "hscrollbar-visible", &h_scroll_visible, "vscrollbar-visible", &v_scroll_visible, NULL); if (self->program == COGL_INVALID_HANDLE) goto out; st_adjustment_get_values (self->vadjustment, &value, &lower, &upper, NULL, NULL, &page_size); if (self->offset_top_uniform > -1) { if (value > lower + 0.1) cogl_program_set_uniform_1f (self->program, self->offset_top_uniform, self->fade_offset); else cogl_program_set_uniform_1f (self->program, self->offset_top_uniform, 0.0f); } if (self->offset_bottom_uniform > -1) { if (value < upper - page_size - 0.1) cogl_program_set_uniform_1f (self->program, self->offset_bottom_uniform, self->fade_offset); else cogl_program_set_uniform_1f (self->program, self->offset_bottom_uniform, 0.0f); } if (self->tex_uniform > -1) cogl_program_set_uniform_1i (self->program, self->tex_uniform, 0); if (self->height_uniform > -1) cogl_program_set_uniform_1f (self->program, self->height_uniform, clutter_actor_get_height (self->actor)); if (self->width_uniform > -1) cogl_program_set_uniform_1f (self->program, self->width_uniform, clutter_actor_get_width (self->actor)); if (self->scrollbar_width_uniform > -1) cogl_program_set_uniform_1f (self->program, self->scrollbar_width_uniform, v_scroll_visible ? clutter_actor_get_width (vscroll) : 0); if (self->scrollbar_height_uniform > -1) cogl_program_set_uniform_1f (self->program, self->scrollbar_height_uniform, h_scroll_visible ? clutter_actor_get_height (hscroll) : 0); if (self->rtl_uniform > -1) cogl_program_set_uniform_1i (self->program, self->rtl_uniform, (st_widget_get_direction (ST_WIDGET (self->actor)) == ST_TEXT_DIRECTION_RTL)); material = clutter_offscreen_effect_get_target (effect); cogl_material_set_user_program (material, self->program); out: parent = CLUTTER_OFFSCREEN_EFFECT_CLASS (st_scroll_view_fade_parent_class); parent->paint_target (effect); }
static gboolean st_scroll_view_fade_pre_paint (ClutterEffect *effect) { StScrollViewFade *self = ST_SCROLL_VIEW_FADE (effect); ClutterEffectClass *parent_class; if (self->shader == COGL_INVALID_HANDLE) return FALSE; if (!clutter_actor_meta_get_enabled (CLUTTER_ACTOR_META (effect))) return FALSE; if (self->actor == NULL) return FALSE; if (self->program == COGL_INVALID_HANDLE) self->program = cogl_create_program (); if (!self->is_attached) { g_assert (self->shader != COGL_INVALID_HANDLE); g_assert (self->program != COGL_INVALID_HANDLE); cogl_program_attach_shader (self->program, self->shader); cogl_program_link (self->program); cogl_handle_unref (self->shader); self->is_attached = TRUE; self->tex_uniform = cogl_program_get_uniform_location (self->program, "tex"); self->height_uniform = cogl_program_get_uniform_location (self->program, "height"); self->width_uniform = cogl_program_get_uniform_location (self->program, "width"); self->scrollbar_width_uniform = cogl_program_get_uniform_location (self->program, "scrollbar_width"); self->scrollbar_height_uniform = cogl_program_get_uniform_location (self->program, "scrollbar_height"); self->rtl_uniform = cogl_program_get_uniform_location (self->program, "rtl"); self->offset_top_uniform = cogl_program_get_uniform_location (self->program, "offset_top"); self->offset_bottom_uniform = cogl_program_get_uniform_location (self->program, "offset_bottom"); } parent_class = CLUTTER_EFFECT_CLASS (st_scroll_view_fade_parent_class); return parent_class->pre_paint (effect); }
static void st_scroll_view_fade_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { StScrollViewFade *self = ST_SCROLL_VIEW_FADE (object); switch (prop_id) { case PROP_FADE_OFFSET: g_value_set_float (value, self->fade_offset); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } }
static void on_adjustment_changed (StAdjustment *adjustment, ClutterEffect *effect) { gdouble value, lower, upper, page_size; gboolean needs_fade; StScrollViewFade *self = ST_SCROLL_VIEW_FADE (effect); st_adjustment_get_values (self->vadjustment, &value, &lower, &upper, NULL, NULL, &page_size); needs_fade = (value > lower + 0.1) || (value < upper - page_size - 0.1); if (!needs_fade) { st_adjustment_get_values (self->hadjustment, &value, &lower, &upper, NULL, NULL, &page_size); needs_fade = (value > lower + 0.1) || (value < upper - page_size - 0.1); } clutter_actor_meta_set_enabled (CLUTTER_ACTOR_META (effect), needs_fade); }
static void st_scroll_view_fade_paint_target (ClutterOffscreenEffect *effect) { StScrollViewFade *self = ST_SCROLL_VIEW_FADE (effect); ClutterOffscreenEffectClass *parent; CoglHandle material; gdouble value, lower, upper, page_size; ClutterActor *vscroll = st_scroll_view_get_vscroll_bar (ST_SCROLL_VIEW (self->actor)); ClutterActor *hscroll = st_scroll_view_get_hscroll_bar (ST_SCROLL_VIEW (self->actor)); gboolean h_scroll_visible, v_scroll_visible; ClutterActorBox allocation, content_box, paint_box; /* * Used to pass the fade area to the shader * * [0][0] = x1 * [0][1] = y1 * [1][0] = x2 * [1][1] = y2 * */ float fade_area[2][2]; ClutterVertex verts[4]; if (self->program == COGL_INVALID_HANDLE) goto out; clutter_actor_get_paint_box (self->actor, &paint_box); clutter_actor_get_abs_allocation_vertices (self->actor, verts); clutter_actor_get_allocation_box (self->actor, &allocation); st_theme_node_get_content_box (st_widget_get_theme_node (ST_WIDGET (self->actor)), (const ClutterActorBox *)&allocation, &content_box); /* * The FBO is based on the paint_volume's size which can be larger then the actual * allocation, so we have to account for that when passing the positions */ fade_area[0][0] = content_box.x1 + (verts[0].x - paint_box.x1); fade_area[0][1] = content_box.y1 + (verts[0].y - paint_box.y1); fade_area[1][0] = content_box.x2 + (verts[3].x - paint_box.x2); fade_area[1][1] = content_box.y2 + (verts[3].y - paint_box.y2); g_object_get (ST_SCROLL_VIEW (self->actor), "hscrollbar-visible", &h_scroll_visible, "vscrollbar-visible", &v_scroll_visible, NULL); if (v_scroll_visible) { if (st_widget_get_direction (ST_WIDGET (self->actor)) == ST_TEXT_DIRECTION_RTL) fade_area[0][0] += clutter_actor_get_width (vscroll); fade_area[1][0] -= clutter_actor_get_width (vscroll); } if (h_scroll_visible) fade_area[1][1] -= clutter_actor_get_height (hscroll); st_adjustment_get_values (self->vadjustment, &value, &lower, &upper, NULL, NULL, &page_size); if (self->offset_top_uniform > -1) { if (value > lower + 0.1) cogl_program_set_uniform_1f (self->program, self->offset_top_uniform, self->fade_offset); else cogl_program_set_uniform_1f (self->program, self->offset_top_uniform, 0.0f); } if (self->offset_bottom_uniform > -1) { if (value < upper - page_size - 0.1) cogl_program_set_uniform_1f (self->program, self->offset_bottom_uniform, self->fade_offset); else cogl_program_set_uniform_1f (self->program, self->offset_bottom_uniform, 0.0f); } if (self->tex_uniform > -1) cogl_program_set_uniform_1i (self->program, self->tex_uniform, 0); if (self->height_uniform > -1) cogl_program_set_uniform_1f (self->program, self->height_uniform, clutter_actor_get_height (self->actor)); if (self->width_uniform > -1) cogl_program_set_uniform_1f (self->program, self->width_uniform, clutter_actor_get_width (self->actor)); if (self->fade_area_uniform > -1) cogl_program_set_uniform_matrix (self->program, self->fade_area_uniform, 2, 1, FALSE, (const float *)fade_area); material = clutter_offscreen_effect_get_target (effect); cogl_material_set_user_program (material, self->program); out: parent = CLUTTER_OFFSCREEN_EFFECT_CLASS (st_scroll_view_fade_parent_class); parent->paint_target (effect); }