[gnome-photos] Add PhotosWidgetShader
- From: Debarshi Ray <debarshir src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gnome-photos] Add PhotosWidgetShader
- Date: Fri, 4 Dec 2015 10:59:42 +0000 (UTC)
commit 0617b3b87768f4a7e927c1d1be10d979611dc26a
Author: Debarshi Ray <debarshir gnome org>
Date: Fri Dec 4 02:28:31 2015 +0100
Add PhotosWidgetShader
Given a GtkWidget it will draw a RGBA(0,0,0,0.5) shadow over it. Unless
you explicitly take a reference, it's lifetime will be restricted to
that of the GtkWidget.
src/Makefile.am | 2 +
src/photos-widget-shader.c | 227 ++++++++++++++++++++++++++++++++++++++++++++
src/photos-widget-shader.h | 50 ++++++++++
3 files changed, 279 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 15c858f..2d1aabe 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -230,6 +230,8 @@ gnome_photos_SOURCES = \
photos-view-container.h \
photos-view-model.c \
photos-view-model.h \
+ photos-widget-shader.c \
+ photos-widget-shader.h \
photos-main.c \
$(NULL)
diff --git a/src/photos-widget-shader.c b/src/photos-widget-shader.c
new file mode 100644
index 0000000..11224ba
--- /dev/null
+++ b/src/photos-widget-shader.c
@@ -0,0 +1,227 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 2015 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+
+#include "config.h"
+
+#include <cairo.h>
+
+#include "photos-widget-shader.h"
+
+
+struct _PhotosWidgetShader
+{
+ GInitiallyUnowned parent_instance;
+ GtkWidget *widget;
+ cairo_surface_t *surface;
+ gboolean active;
+};
+
+struct _PhotosWidgetShaderClass
+{
+ GInitiallyUnownedClass parent_class;
+};
+
+enum
+{
+ PROP_0,
+ PROP_ACTIVE,
+ PROP_WIDGET
+};
+
+
+G_DEFINE_TYPE (PhotosWidgetShader, photos_widget_shader, G_TYPE_INITIALLY_UNOWNED);
+
+
+static gboolean
+photos_widget_shader_draw (PhotosWidgetShader *self, cairo_t *cr)
+{
+ if (!self->active)
+ goto out;
+
+ cairo_save (cr);
+ cairo_set_source_surface (cr, self->surface, 0.0, 0.0);
+ cairo_paint (cr);
+ cairo_restore (cr);
+
+ out:
+ return GDK_EVENT_PROPAGATE;
+}
+
+
+static void
+photos_widget_shader_surface_create (PhotosWidgetShader *self)
+{
+ GdkRectangle allocation;
+ GdkWindow *window;
+ cairo_t *cr = NULL;
+
+ g_clear_pointer (&self->surface, (GDestroyNotify) cairo_surface_destroy);
+
+ if (self->widget == NULL)
+ goto out;
+
+ window = gtk_widget_get_window (self->widget);
+ if (window == NULL)
+ goto out;
+
+ gtk_widget_get_allocation (self->widget, &allocation);
+ self->surface = gdk_window_create_similar_surface (window,
+ CAIRO_CONTENT_COLOR_ALPHA,
+ allocation.width,
+ allocation.height);
+
+ cr = cairo_create (self->surface);
+ cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
+ cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.5);
+ cairo_paint (cr);
+
+ out:
+ g_clear_pointer (&cr, (GDestroyNotify) cairo_destroy);
+}
+
+
+static void
+photos_widget_shader_size_allocate (PhotosWidgetShader *self)
+{
+ photos_widget_shader_surface_create (self);
+}
+
+
+static void
+photos_widget_shader_constructed (GObject *object)
+{
+ PhotosWidgetShader *self = PHOTOS_WIDGET_SHADER (object);
+
+ G_OBJECT_CLASS (photos_widget_shader_parent_class)->constructed (object);
+
+ photos_widget_shader_surface_create (self);
+
+ g_signal_connect_object (self->widget,
+ "draw",
+ G_CALLBACK (photos_widget_shader_draw),
+ self,
+ G_CONNECT_AFTER | G_CONNECT_SWAPPED);
+ g_signal_connect_object (self->widget,
+ "size-allocate",
+ G_CALLBACK (photos_widget_shader_size_allocate),
+ self,
+ G_CONNECT_SWAPPED);
+
+ g_object_ref_sink (self);
+}
+
+
+static void
+photos_widget_shader_finalize (GObject *object)
+{
+ PhotosWidgetShader *self = PHOTOS_WIDGET_SHADER (object);
+
+ g_assert_null (self->widget);
+ g_clear_pointer (&self->surface, (GDestroyNotify) cairo_surface_destroy);
+
+ G_OBJECT_CLASS (photos_widget_shader_parent_class)->finalize (object);
+}
+
+
+static void
+photos_widget_shader_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
+{
+ PhotosWidgetShader *self = PHOTOS_WIDGET_SHADER (object);
+
+ switch (prop_id)
+ {
+ case PROP_ACTIVE:
+ {
+ gboolean active;
+
+ active = g_value_get_boolean (value);
+ photos_widget_shader_set_active (self, active);
+ break;
+ }
+
+ case PROP_WIDGET:
+ self->widget = GTK_WIDGET (g_value_get_object (value));
+ g_object_add_weak_pointer (G_OBJECT (self->widget), (gpointer *) &self->widget);
+ g_object_weak_ref (G_OBJECT (self->widget), (GWeakNotify) g_object_unref, self);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+
+static void
+photos_widget_shader_init (PhotosWidgetShader *self)
+{
+}
+
+
+static void
+photos_widget_shader_class_init (PhotosWidgetShaderClass *class)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+ object_class->constructed = photos_widget_shader_constructed;
+ object_class->finalize = photos_widget_shader_finalize;
+ object_class->set_property = photos_widget_shader_set_property;
+
+ g_object_class_install_property (object_class,
+ PROP_ACTIVE,
+ g_param_spec_boolean ("active",
+ "Active",
+ "Whether the widget shader is active or not",
+ FALSE,
+ G_PARAM_WRITABLE));
+
+ g_object_class_install_property (object_class,
+ PROP_WIDGET,
+ g_param_spec_object ("widget",
+ "Widget",
+ "The target widget that is going to be shaded",
+ GTK_TYPE_WIDGET,
+ G_PARAM_CONSTRUCT_ONLY | G_PARAM_WRITABLE));
+}
+
+
+PhotosWidgetShader *
+photos_widget_shader_new (GtkWidget *widget)
+{
+ g_return_val_if_fail (widget != NULL && GTK_IS_WIDGET (widget), NULL);
+ return g_object_new (PHOTOS_TYPE_WIDGET_SHADER, "widget", widget, NULL);
+}
+
+
+void
+photos_widget_shader_set_active (PhotosWidgetShader *self, gboolean active)
+{
+ if (self->active == active)
+ return;
+
+ self->active = active;
+ g_object_notify (G_OBJECT (self), "active");
+
+ if (self->widget == NULL)
+ return;
+
+ gtk_widget_queue_draw (self->widget);
+}
diff --git a/src/photos-widget-shader.h b/src/photos-widget-shader.h
new file mode 100644
index 0000000..0f5391f
--- /dev/null
+++ b/src/photos-widget-shader.h
@@ -0,0 +1,50 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 2015 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef PHOTOS_WIDGET_SHADER_H
+#define PHOTOS_WIDGET_SHADER_H
+
+#include <glib-object.h>
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define PHOTOS_TYPE_WIDGET_SHADER (photos_widget_shader_get_type ())
+
+#define PHOTOS_WIDGET_SHADER(obj) \
+ (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
+ PHOTOS_TYPE_WIDGET_SHADER, PhotosWidgetShader))
+
+#define PHOTOS_IS_WIDGET_SHADER(obj) \
+ (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
+ PHOTOS_TYPE_WIDGET_SHADER))
+
+typedef struct _PhotosWidgetShader PhotosWidgetShader;
+typedef struct _PhotosWidgetShaderClass PhotosWidgetShaderClass;
+
+GType photos_widget_shader_get_type (void) G_GNUC_CONST;
+
+PhotosWidgetShader *photos_widget_shader_new (GtkWidget *widget);
+
+void photos_widget_shader_set_active (PhotosWidgetShader *self, gboolean
active);
+
+G_END_DECLS
+
+#endif /* PHOTOS_WIDGET_SHADER_H */
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