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Diffstat (limited to 'src/st/st-scroll-view-fade.c')
| -rw-r--r-- | src/st/st-scroll-view-fade.c | 461 |
1 files changed, 461 insertions, 0 deletions
diff --git a/src/st/st-scroll-view-fade.c b/src/st/st-scroll-view-fade.c new file mode 100644 index 0000000..77b1d0b --- /dev/null +++ b/src/st/st-scroll-view-fade.c @@ -0,0 +1,461 @@ +/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ +/* + * st-scroll-view-fade.h: Edge fade effect for StScrollView + * + * Copyright 2010 Intel Corporation. + * Copyright 2011 Adel Gadllah + * + * 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/>. + */ + + +#include "st-private.h" +#include "st-scroll-view-fade.h" +#include "st-scroll-view.h" +#include "st-widget.h" +#include "st-theme-node.h" +#include "st-scroll-bar.h" +#include "st-scrollable.h" + +#include <clutter/clutter.h> +#include <cogl/cogl.h> + +#define DEFAULT_FADE_OFFSET 68.0f + +#include "st-scroll-view-fade-generated.h" + +struct _StScrollViewFade +{ + ClutterShaderEffect parent_instance; + + /* a back pointer to our actor, so that we can query it */ + ClutterActor *actor; + + StAdjustment *vadjustment; + StAdjustment *hadjustment; + + guint fade_edges : 1; + guint extend_fade_area: 1; + + ClutterMargin fade_margins; +}; + +G_DEFINE_TYPE (StScrollViewFade, + st_scroll_view_fade, + CLUTTER_TYPE_SHADER_EFFECT); + +enum { + PROP_0, + + PROP_FADE_MARGINS, + PROP_FADE_EDGES, + PROP_EXTEND_FADE_AREA, + + N_PROPS +}; + +static GParamSpec *props[N_PROPS] = { NULL, }; + +static CoglTexture * +st_scroll_view_fade_create_texture (ClutterOffscreenEffect *effect, + gfloat min_width, + gfloat min_height) +{ + CoglContext *ctx = + clutter_backend_get_cogl_context (clutter_get_default_backend ()); + + return COGL_TEXTURE (cogl_texture_2d_new_with_size (ctx, min_width, min_height)); +} + +static char * +st_scroll_view_fade_get_static_shader_source (ClutterShaderEffect *effect) +{ + return g_strdup (st_scroll_view_fade_glsl); +} + + +static void +st_scroll_view_fade_paint_target (ClutterOffscreenEffect *effect, + ClutterPaintNode *node, + ClutterPaintContext *paint_context) +{ + StScrollViewFade *self = ST_SCROLL_VIEW_FADE (effect); + ClutterShaderEffect *shader = CLUTTER_SHADER_EFFECT (effect); + ClutterOffscreenEffectClass *parent; + + 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, rtl; + + ClutterActorBox allocation, content_box, paint_box; + + float fade_area_topleft[2]; + float fade_area_bottomright[2]; + graphene_point3d_t verts[4]; + + 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_topleft[0] = content_box.x1 + (verts[0].x - paint_box.x1); + fade_area_topleft[1] = content_box.y1 + (verts[0].y - paint_box.y1); + fade_area_bottomright[0] = content_box.x2 + (verts[3].x - paint_box.x2) + 1; + fade_area_bottomright[1] = content_box.y2 + (verts[3].y - paint_box.y2) + 1; + + g_object_get (ST_SCROLL_VIEW (self->actor), + "hscrollbar-visible", &h_scroll_visible, + "vscrollbar-visible", &v_scroll_visible, + NULL); + + if (v_scroll_visible) + { + if (clutter_actor_get_text_direction (self->actor) == CLUTTER_TEXT_DIRECTION_RTL) + fade_area_topleft[0] += clutter_actor_get_width (vscroll); + + fade_area_bottomright[0] -= clutter_actor_get_width (vscroll); + } + + if (h_scroll_visible) + fade_area_bottomright[1] -= clutter_actor_get_height (hscroll); + + if (self->fade_margins.left < 0) + fade_area_topleft[0] -= ABS (self->fade_margins.left); + if (self->fade_margins.right < 0) + fade_area_bottomright[0] += ABS (self->fade_margins.right); + if (self->fade_margins.top < 0) + fade_area_topleft[1] -= ABS (self->fade_margins.top); + if (self->fade_margins.bottom < 0) + fade_area_bottomright[1] += ABS (self->fade_margins.bottom); + + st_adjustment_get_values (self->vadjustment, &value, &lower, &upper, NULL, NULL, &page_size); + value = (value - lower) / (upper - page_size - lower); + clutter_shader_effect_set_uniform (shader, "fade_edges_top", G_TYPE_INT, 1, self->fade_edges ? value >= 0.0 : value > 0.0); + clutter_shader_effect_set_uniform (shader, "fade_edges_bottom", G_TYPE_INT, 1, self->fade_edges ? value <= 1.0 : value < 1.0); + + st_adjustment_get_values (self->hadjustment, &value, &lower, &upper, NULL, NULL, &page_size); + value = (value - lower) / (upper - page_size - lower); + rtl = clutter_actor_get_text_direction (self->actor) == CLUTTER_TEXT_DIRECTION_RTL; + clutter_shader_effect_set_uniform (shader, "fade_edges_left", G_TYPE_INT, 1, + self->fade_edges ? + value >= 0.0 : + (rtl ? value < 1.0 : value > 0.0)); + clutter_shader_effect_set_uniform (shader, "fade_edges_right", G_TYPE_INT, 1, + self->fade_edges ? + value <= 1.0 : + (rtl ? value > 0.0 : value < 1.0)); + + clutter_shader_effect_set_uniform (shader, "extend_fade_area", G_TYPE_INT, 1, self->extend_fade_area); + clutter_shader_effect_set_uniform (shader, "fade_offset_top", G_TYPE_FLOAT, 1, ABS (self->fade_margins.top)); + clutter_shader_effect_set_uniform (shader, "fade_offset_bottom", G_TYPE_FLOAT, 1, ABS (self->fade_margins.bottom)); + clutter_shader_effect_set_uniform (shader, "fade_offset_left", G_TYPE_FLOAT, 1, ABS (self->fade_margins.left)); + clutter_shader_effect_set_uniform (shader, "fade_offset_right", G_TYPE_FLOAT, 1, ABS (self->fade_margins.right)); + clutter_shader_effect_set_uniform (shader, "tex", G_TYPE_INT, 1, 0); + clutter_shader_effect_set_uniform (shader, "height", G_TYPE_FLOAT, 1, clutter_actor_get_height (self->actor)); + clutter_shader_effect_set_uniform (shader, "width", G_TYPE_FLOAT, 1, clutter_actor_get_width (self->actor)); + clutter_shader_effect_set_uniform (shader, "fade_area_topleft", CLUTTER_TYPE_SHADER_FLOAT, 2, fade_area_topleft); + clutter_shader_effect_set_uniform (shader, "fade_area_bottomright", CLUTTER_TYPE_SHADER_FLOAT, 2, fade_area_bottomright); + + parent = CLUTTER_OFFSCREEN_EFFECT_CLASS (st_scroll_view_fade_parent_class); + parent->paint_target (effect, node, paint_context); +} + +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_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->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_dispose (GObject *gobject) +{ + StScrollViewFade *self = ST_SCROLL_VIEW_FADE (gobject); + + 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; + } + + self->actor = NULL; + + G_OBJECT_CLASS (st_scroll_view_fade_parent_class)->dispose (gobject); +} + +static void +st_scroll_view_set_fade_margins (StScrollViewFade *self, + ClutterMargin *fade_margins) +{ + if (self->fade_margins.left == fade_margins->left && + self->fade_margins.right == fade_margins->right && + self->fade_margins.top == fade_margins->top && + self->fade_margins.bottom == fade_margins->bottom) + return; + + self->fade_margins = *fade_margins; + + if (self->actor != NULL) + clutter_actor_queue_redraw (self->actor); + + g_object_notify_by_pspec (G_OBJECT (self), props[PROP_FADE_MARGINS]); +} + +static void +st_scroll_view_fade_set_fade_edges (StScrollViewFade *self, + gboolean fade_edges) +{ + if (self->fade_edges == fade_edges) + return; + + g_object_freeze_notify (G_OBJECT (self)); + + self->fade_edges = fade_edges; + + if (self->actor != NULL) + clutter_actor_queue_redraw (self->actor); + + g_object_notify_by_pspec (G_OBJECT (self), props[PROP_FADE_EDGES]); + g_object_thaw_notify (G_OBJECT (self)); +} + +static void +st_scroll_view_fade_set_extend_fade_area (StScrollViewFade *self, + gboolean extend_fade_area) +{ + if (self->extend_fade_area == extend_fade_area) + return; + + self->extend_fade_area = extend_fade_area; + + if (self->actor != NULL) + clutter_actor_queue_redraw (self->actor); + + g_object_notify_by_pspec (G_OBJECT (self), props[PROP_EXTEND_FADE_AREA]); +} + +static void +st_scroll_view_fade_set_property (GObject *object, + guint prop_id, + const GValue *value, + GParamSpec *pspec) +{ + StScrollViewFade *self = ST_SCROLL_VIEW_FADE (object); + + switch (prop_id) + { + case PROP_FADE_MARGINS: + st_scroll_view_set_fade_margins (self, g_value_get_boxed (value)); + break; + case PROP_FADE_EDGES: + st_scroll_view_fade_set_fade_edges (self, g_value_get_boolean (value)); + break; + case PROP_EXTEND_FADE_AREA: + st_scroll_view_fade_set_extend_fade_area (self, g_value_get_boolean (value)); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +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_MARGINS: + g_value_set_boxed (value, &self->fade_margins); + break; + case PROP_FADE_EDGES: + g_value_set_boolean (value, self->fade_edges); + break; + case PROP_EXTEND_FADE_AREA: + g_value_set_boolean (value, self->extend_fade_area); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static void +st_scroll_view_fade_class_init (StScrollViewFadeClass *klass) +{ + GObjectClass *gobject_class = G_OBJECT_CLASS (klass); + ClutterShaderEffectClass *shader_class; + ClutterOffscreenEffectClass *offscreen_class; + ClutterActorMetaClass *meta_class = CLUTTER_ACTOR_META_CLASS (klass); + + gobject_class->dispose = st_scroll_view_fade_dispose; + gobject_class->get_property = st_scroll_view_fade_get_property; + gobject_class->set_property = st_scroll_view_fade_set_property; + + meta_class->set_actor = st_scroll_view_fade_set_actor; + + shader_class = CLUTTER_SHADER_EFFECT_CLASS (klass); + shader_class->get_static_shader_source = st_scroll_view_fade_get_static_shader_source; + + offscreen_class = CLUTTER_OFFSCREEN_EFFECT_CLASS (klass); + offscreen_class->create_texture = st_scroll_view_fade_create_texture; + offscreen_class->paint_target = st_scroll_view_fade_paint_target; + + /** + * StScrollViewFade:fade-margins: + * + * The margins widths that are faded. + */ + props[PROP_FADE_MARGINS] = + g_param_spec_boxed ("fade-margins", + "Fade margins", + "The margin widths that are faded", + CLUTTER_TYPE_MARGIN, + ST_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY); + + /** + * StScrollViewFade:fade-edges: + * + * Whether the faded area should extend to the edges of the #StScrollViewFade. + */ + props[PROP_FADE_EDGES] = + g_param_spec_boolean ("fade-edges", + "Fade Edges", + "Whether the faded area should extend to the edges", + FALSE, + ST_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY); + + /** + * StScrollViewFade:extend-fade-area: + * + * Whether faded edges should extend beyond the faded area of the #StScrollViewFade. + */ + props[PROP_EXTEND_FADE_AREA] = + g_param_spec_boolean ("extend-fade-area", + "Extend Fade Area", + "Whether faded edges should extend beyond the faded area", + FALSE, + ST_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY); + + g_object_class_install_properties (gobject_class, N_PROPS, props); +} + +static void +st_scroll_view_fade_init (StScrollViewFade *self) +{ + self->fade_margins = (ClutterMargin) { + DEFAULT_FADE_OFFSET, + DEFAULT_FADE_OFFSET, + DEFAULT_FADE_OFFSET, + DEFAULT_FADE_OFFSET, + }; +} + +/** + * st_scroll_view_fade_new: + * + * Create a new #StScrollViewFade. + * + * Returns: (transfer full): a new #StScrollViewFade + */ +ClutterEffect * +st_scroll_view_fade_new (void) +{ + return g_object_new (ST_TYPE_SCROLL_VIEW_FADE, NULL); +} |