Add 'source selection' dialog

Add a 'source selection' dialog to replace the 'enter a name' dialog.
This new dialog allows you to make new instances of pre-existing sources
so that you can add a pre-existing source to a different scene, or in to
the same scene more than once.

Also started implementing locale.

Comtemplating switching to JSON-based locale later, so we can add things
like descriptions/disambiguation, and so we can use jansson's built-in
hash table when doing the string lookup.

obs/window-basic-source-select.cpp

@@ -0,0 +1,147 @@
+/******************************************************************************
+    Copyright (C) 2014 by Hugh Bailey <obs.jim@gmail.com>
+
+    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, see <http://www.gnu.org/licenses/>.
+******************************************************************************/
+
+#include "window-basic-main.hpp"
+#include "window-basic-source-select.hpp"
+#include "qt-wrappers.hpp"
+
+bool OBSBasicSourceSelect::EnumSources(void *data, obs_source_t source)
+{
+	OBSBasicSourceSelect *window = static_cast<OBSBasicSourceSelect*>(data);
+	const char *name = obs_source_getname(source);
+	const char *type;
+
+	obs_source_gettype(source, nullptr, &type);
+
+	if (strcmp(type, window->type) == 0)
+		window->ui->sourceList->addItem(QT_UTF8(name));
+
+	return true;
+}
+
+void OBSBasicSourceSelect::OBSSourceAdded(void *data, calldata_t calldata)
+{
+	OBSBasicSourceSelect *window = static_cast<OBSBasicSourceSelect*>(data);
+	obs_source_t source = (obs_source_t)calldata_ptr(calldata, "source");
+
+	QMetaObject::invokeMethod(window, "SourceAdded",
+			Q_ARG(OBSSource, source));
+}
+
+void OBSBasicSourceSelect::OBSSourceRemoved(void *data, calldata_t calldata)
+{
+	OBSBasicSourceSelect *window = static_cast<OBSBasicSourceSelect*>(data);
+	obs_source_t source = (obs_source_t)calldata_ptr(calldata, "source");
+
+	QMetaObject::invokeMethod(window, "SourceRemoved",
+			Q_ARG(OBSSource, source));
+}
+
+void OBSBasicSourceSelect::SourceAdded(OBSSource source)
+{
+	const char *name = obs_source_getname(source);
+	const char *sourceType;
+
+	obs_source_gettype(source, nullptr, &sourceType);
+	if (strcmp(sourceType, type) != 0)
+		return;
+
+	ui->sourceList->addItem(name);
+}
+
+void OBSBasicSourceSelect::SourceRemoved(OBSSource source)
+{
+	const char *name = obs_source_getname(source);
+	const char *sourceType;
+
+	obs_source_gettype(source, nullptr, &sourceType);
+	if (strcmp(sourceType, type) != 0)
+		return;
+
+	QList<QListWidgetItem*> items =
+		ui->sourceList->findItems(name, Qt::MatchFixedString);
+
+	if (!items.count())
+		return;
+
+	delete items[0];
+}
+
+static void AddExisting(const char *name)
+{
+	obs_source_t source = obs_get_output_source(0);
+	obs_scene_t  scene  = obs_scene_fromsource(source);
+	if (!scene)
+		return;
+
+	source = obs_get_source_by_name(name);
+	if (source) {
+		obs_scene_add(scene, source);
+		obs_source_release(source);
+	}
+
+	obs_scene_release(scene);
+}
+
+void AddNew(const char *id, const char *name)
+{
+	obs_source_t source = obs_get_output_source(0);
+	obs_scene_t  scene  = obs_scene_fromsource(source);
+	if (!scene)
+		return;
+
+	source = obs_source_create(OBS_SOURCE_TYPE_INPUT,
+			id, name, NULL);
+
+	obs_add_source(source);
+	obs_scene_add(scene, source);
+	obs_source_release(source);
+
+	obs_scene_release(scene);
+}
+
+void OBSBasicSourceSelect::on_buttonBox_accepted()
+{
+	bool useExisting = ui->selectExisting->isChecked();
+
+	if (useExisting) {
+		QListWidgetItem *item = ui->sourceList->currentItem();
+		if (!item)
+			return;
+
+		AddExisting(QT_TO_UTF8(item->text()));
+	} else {
+		AddNew(type, QT_TO_UTF8(ui->sourceName->text()));
+	}
+
+	done(DialogCode::Accepted);
+}
+
+void OBSBasicSourceSelect::on_buttonBox_rejected()
+{
+	done(DialogCode::Rejected);
+}
+
+OBSBasicSourceSelect::OBSBasicSourceSelect(OBSBasic *parent, const char *type_)
+	: QDialog (parent),
+	  ui      (new Ui::OBSBasicSourceSelect),
+	  type    (type_)
+{
+	ui->setupUi(this);
+
+	obs_enum_sources(EnumSources, this);
+}