[evolution/webkit-composer: 1/147] Import GtkHTMLImageChooserDialog to EImageChooserDialog

[Matthew Barnes <mbarnes src gnome org>]

commit da7778622768ee2264a2165da58c83a429d56ae7
Author: Dan VrÃtil <dvratil redhat com>
Date:   Mon Jul 23 10:13:40 2012 +0200

    Import GtkHTMLImageChooserDialog to EImageChooserDialog

 e-util/Makefile.am              |    2 +
 e-util/e-image-chooser-dialog.c |  219 +++++++++++++++++++++++++++++++++++++++
 e-util/e-image-chooser-dialog.h |   72 +++++++++++++
 3 files changed, 293 insertions(+), 0 deletions(-)
---
diff --git a/e-util/Makefile.am b/e-util/Makefile.am
index ad77511..b4f98f9 100644
--- a/e-util/Makefile.am
+++ b/e-util/Makefile.am
@@ -183,6 +183,7 @@ eutilinclude_HEADERS =  \
 	e-html-utils.h \
 	e-icon-factory.h \
 	e-image-chooser.h \
+	e-image-chooser-dialog.h \
 	e-import-assistant.h \
 	e-import.h \
 	e-interval-chooser.h \
@@ -428,6 +429,7 @@ libeutil_la_SOURCES = \
 	e-html-utils.c \
 	e-icon-factory.c \
 	e-image-chooser.c \
+	e-image-chooser-dialog.c \
 	e-import-assistant.c \
 	e-import.c \
 	e-interval-chooser.c \
diff --git a/e-util/e-image-chooser-dialog.c b/e-util/e-image-chooser-dialog.c
new file mode 100644
index 0000000..17daca3
--- /dev/null
+++ b/e-util/e-image-chooser-dialog.c
@@ -0,0 +1,219 @@
+/*
+ * e-image-chooser-dialog.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU Lesser General Public
+ * License as published by the Free Software Foundation.
+ *
+ * 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 Lesser General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "e-image-chooser-dialog.h"
+
+#define PREVIEW_WIDTH	256
+#define PREVIEW_HEIGHT	256
+
+typedef struct _Context Context;
+
+struct _EImageChooserDialogPrivate {
+	GCancellable *cancellable;
+};
+
+struct _Context {
+	GtkFileChooser *file_chooser;
+	GCancellable *cancellable;
+};
+
+G_DEFINE_TYPE (
+	EImageChooserDialog,
+	e_image_chooser_dialog,
+	GTK_TYPE_FILE_CHOOSER_DIALOG)
+
+static void
+context_free (Context *context)
+{
+	g_object_unref (context->file_chooser);
+	g_object_unref (context->cancellable);
+
+	g_slice_free (Context, context);
+}
+
+static void
+image_chooser_dialog_read_cb (GFile *preview_file,
+                              GAsyncResult *result,
+                              Context *context)
+{
+	GdkPixbuf *pixbuf;
+	GtkWidget *preview_widget;
+	GFileInputStream *input_stream;
+
+	input_stream = g_file_read_finish (preview_file, result, NULL);
+
+	/* FIXME Handle errors better, but remember
+	 *       to ignore G_IO_ERROR_CANCELLED. */
+	if (input_stream == NULL)
+		goto exit;
+
+	/* XXX This blocks, but GDK-PixBuf offers no asynchronous
+	 *     alternative and I don't want to deal with making GDK
+	 *     calls from threads and all the crap that goes with it. */
+	pixbuf = gdk_pixbuf_new_from_stream_at_scale (
+		G_INPUT_STREAM (input_stream),
+		PREVIEW_WIDTH, PREVIEW_HEIGHT, TRUE,
+		context->cancellable, NULL);
+
+	preview_widget = gtk_file_chooser_get_preview_widget (
+		context->file_chooser);
+
+	gtk_file_chooser_set_preview_widget_active (
+		context->file_chooser, pixbuf != NULL);
+
+	gtk_image_set_from_pixbuf (GTK_IMAGE (preview_widget), pixbuf);
+
+	if (pixbuf != NULL)
+		g_object_unref (pixbuf);
+
+	g_object_unref (input_stream);
+
+exit:
+	context_free (context);
+}
+
+static void
+image_chooser_dialog_update_preview (GtkFileChooser *file_chooser)
+{
+	EImageChooserDialogPrivate *priv;
+	GtkWidget *preview_widget;
+	GFile *preview_file;
+	Context *context;
+
+	priv = E_IMAGE_CHOOSER_DIALOG (file_chooser)->priv;
+	preview_file = gtk_file_chooser_get_preview_file (file_chooser);
+	preview_widget = gtk_file_chooser_get_preview_widget (file_chooser);
+
+	if (priv->cancellable != NULL) {
+		g_cancellable_cancel (priv->cancellable);
+		g_object_unref (priv->cancellable);
+		priv->cancellable = NULL;
+	}
+
+	gtk_image_clear (GTK_IMAGE (preview_widget));
+	gtk_file_chooser_set_preview_widget_active (file_chooser, FALSE);
+
+	if (preview_file == NULL)
+		return;
+
+	priv->cancellable = g_cancellable_new ();
+
+	context = g_slice_new0 (Context);
+	context->file_chooser = g_object_ref (file_chooser);
+	context->cancellable = g_object_ref (priv->cancellable);
+
+	g_file_read_async (
+		preview_file, G_PRIORITY_LOW,
+		priv->cancellable, (GAsyncReadyCallback)
+		image_chooser_dialog_read_cb, context);
+
+	g_object_unref (preview_file);
+}
+
+static void
+image_chooser_dialog_dispose (GObject *object)
+{
+	EImageChooserDialogPrivate *priv;
+
+	priv = E_IMAGE_CHOOSER_DIALOG (object)->priv;
+
+	if (priv->cancellable != NULL) {
+		g_cancellable_cancel (priv->cancellable);
+		g_object_unref (priv->cancellable);
+		priv->cancellable = NULL;
+	}
+
+	/* Chain up to parent's dispose() method. */
+	G_OBJECT_CLASS (e_image_chooser_dialog_parent_class)->dispose (object);
+}
+
+static void
+image_chooser_dialog_constructed (GObject *object)
+{
+	GtkFileChooser *file_chooser;
+	GtkFileFilter *file_filter;
+
+	file_chooser = GTK_FILE_CHOOSER (object);
+	gtk_file_chooser_set_local_only (file_chooser, FALSE);
+
+	gtk_dialog_add_button (
+		GTK_DIALOG (file_chooser),
+		GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL);
+	gtk_dialog_add_button (
+		GTK_DIALOG (file_chooser),
+		GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT);
+	gtk_dialog_set_default_response (
+		GTK_DIALOG (file_chooser), GTK_RESPONSE_ACCEPT);
+
+	file_filter = gtk_file_filter_new ();
+	gtk_file_filter_add_pixbuf_formats (file_filter);
+	gtk_file_chooser_set_filter (file_chooser, file_filter);
+
+	gtk_file_chooser_set_preview_widget (file_chooser, gtk_image_new ());
+}
+
+static void
+e_image_chooser_dialog_class_init (EImageChooserDialogClass *klass)
+{
+	GObjectClass *object_class;
+
+	g_type_class_add_private (
+		klass, sizeof (EImageChooserDialogPrivate));
+
+	object_class = G_OBJECT_CLASS (klass);
+	object_class->dispose = image_chooser_dialog_dispose;
+	object_class->constructed = image_chooser_dialog_constructed;
+}
+
+static void
+e_image_chooser_dialog_init (EImageChooserDialog *dialog)
+{
+	dialog->priv = G_TYPE_INSTANCE_GET_PRIVATE (
+		dialog, E_TYPE_IMAGE_CHOOSER_DIALOG,
+		EImageChooserDialogPrivate);
+
+	g_signal_connect (
+		dialog, "update-preview",
+		G_CALLBACK (image_chooser_dialog_update_preview), NULL);
+}
+
+GtkWidget *
+e_image_chooser_dialog_new (const gchar *title,
+			    GtkWindow *parent)
+{
+	return g_object_new (
+		E_TYPE_IMAGE_CHOOSER_DIALOG,
+		"action", GTK_FILE_CHOOSER_ACTION_OPEN,
+		"title", title,
+		"transient-for", parent, NULL);
+}
+
+GFile *
+e_image_chooser_dialog_run (EImageChooserDialog *dialog)
+{
+	GtkFileChooser *file_chooser;
+
+	g_return_val_if_fail (E_IS_IMAGE_CHOOSER_DIALOG (dialog), NULL);
+
+	file_chooser = GTK_FILE_CHOOSER (dialog);
+
+	if (gtk_dialog_run (GTK_DIALOG (dialog)) != GTK_RESPONSE_ACCEPT)
+		return NULL;
+
+	return gtk_file_chooser_get_file (file_chooser);
+}
diff --git a/e-util/e-image-chooser-dialog.h b/e-util/e-image-chooser-dialog.h
new file mode 100644
index 0000000..82f8cec
--- /dev/null
+++ b/e-util/e-image-chooser-dialog.h
@@ -0,0 +1,72 @@
+/*
+ * e-image-chooser-dialog.h
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU Lesser General Public
+ * License as published by the Free Software Foundation.
+ *
+ * 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 Lesser General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#if !defined (__E_UTIL_H_INSIDE__) && !defined (LIBEUTIL_COMPILATION)
+#error "Only <e-util/e-util.h> should be included directly."
+#endif
+
+#ifndef E_IMAGE_CHOOSER_DIALOG_H
+#define E_IMAGE_CHOOSER_DIALOG_H
+
+#include <gtk/gtk.h>
+
+/* Standard GObject macros */
+#define E_TYPE_IMAGE_CHOOSER_DIALOG \
+	(e_image_chooser_dialog_get_type ())
+#define E_IMAGE_CHOOSER_DIALOG(obj) \
+	(G_TYPE_CHECK_INSTANCE_CAST \
+	((obj), E_TYPE_IMAGE_CHOOSER_DIALOG, EImageChooserDialog))
+#define E_IMAGE_CHOOSER_DIALOG_CLASS(cls) \
+	(G_TYPE_CHECK_CLASS_CAST \
+	((cls), E_TYPE_IMAGE_CHOOSER_DIALOG, EImageChooserDialogClass))
+#define E_IS_IMAGE_CHOOSER_DIALOG(obj) \
+	(G_TYPE_CHECK_INSTANCE_TYPE \
+	((obj), E_TYPE_IMAGE_CHOOSER_DIALOG))
+#define E_IS_IMAGE_CHOOSER_DIALOG_CLASS(cls) \
+	(G_TYPE_CHECK_CLASS_TYPE \
+	((cls), E_TYPE_IMAGE_CHOOSER_DIALOG))
+#define E_IMAGE_CHOOSER_DIALOG_GET_CLASS(obj) \
+	(G_TYPE_INSTANCE_GET_CLASS \
+	((obj), E_TYPE_IMAGE_CHOOSER_DIALOG, EImageChooserDialogClass))
+
+G_BEGIN_DECLS
+
+typedef struct _EImageChooserDialog EImageChooserDialog;
+typedef struct _EImageChooserDialogClass EImageChooserDialogClass;
+typedef struct _EImageChooserDialogPrivate EImageChooserDialogPrivate;
+
+struct _EImageChooserDialog {
+	GtkFileChooserDialog parent;
+	EImageChooserDialogPrivate *priv;
+};
+
+struct _EImageChooserDialogClass {
+	GtkFileChooserDialogClass parent_class;
+};
+
+GType		e_image_chooser_dialog_get_type
+					(void) G_GNUC_CONST;
+GtkWidget *	e_image_chooser_dialog_new
+					(const gchar *title,
+					 GtkWindow *parent);
+GFile *		e_image_chooser_dialog_run
+					(EImageChooserDialog *dialog);
+
+G_END_DECLS
+
+#endif /* E_IMAGE_CHOOSER_DIALOG_H */