Add support for Qt5 in Gtk3

1 files changed, 233 insertions, 0 deletions

diff --git a/src/qt5_in_gtk.cpp b/src/qt5_in_gtk.cpp
new file mode 100644
index 0000000..e74ab5d
--- /dev/null
+++ b/src/qt5_in_gtk.cpp
@@ -0,0 +1,233 @@
+/*
+  Copyright 2011-2017 David Robillard <http://drobilla.net>
+  Copyright 2018 Rui Nuno Capela <rncbc@rncbc.org>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include <gtk/gtk.h>
+
+#include <QVBoxLayout>
+#include <QWidget>
+#include <QWindow>
+
+#if GTK_MAJOR_VERSION == 3
+#include <gtk/gtkx.h>
+#endif
+
+#include "lv2/options/options.h"
+#include "lv2/urid/urid.h"
+
+#include "./suil_internal.h"
+
+extern "C" {
+
+#define SUIL_TYPE_QT_WRAPPER (suil_qt_wrapper_get_type())
+#define SUIL_QT_WRAPPER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), SUIL_TYPE_QT_WRAPPER, SuilQtWrapper))
+
+typedef struct _SuilQtWrapper      SuilQtWrapper;
+typedef struct _SuilQtWrapperClass SuilQtWrapperClass;
+
+struct _SuilQtWrapper {
+	GtkSocket                   socket;
+	QWidget*                    qembed;
+	SuilWrapper*                wrapper;
+	SuilInstance*               instance;
+	const LV2UI_Idle_Interface* idle_iface;
+	guint                       idle_id;
+	guint                       idle_ms;
+};
+
+struct _SuilQtWrapperClass {
+	GtkSocketClass parent_class;
+};
+
+GType suil_qt_wrapper_get_type(void);  // Accessor for SUIL_TYPE_QT_WRAPPER
+
+G_DEFINE_TYPE(SuilQtWrapper, suil_qt_wrapper, GTK_TYPE_SOCKET)
+
+static void
+suil_qt_wrapper_finalize(GObject* gobject)
+{
+	SuilQtWrapper* const self = SUIL_QT_WRAPPER(gobject);
+
+	if (self->idle_id) {
+		g_source_remove(self->idle_id);
+		self->idle_id = 0;
+	}
+
+	if (self->instance->handle) {
+		self->instance->descriptor->cleanup(self->instance->handle);
+		self->instance->handle = NULL;
+	}
+
+	if (self->qembed) {
+		self->qembed->deleteLater();
+	}
+
+	self->qembed        = NULL;
+	self->idle_iface    = NULL;
+	self->wrapper->impl = NULL;
+
+	G_OBJECT_CLASS(suil_qt_wrapper_parent_class)->finalize(gobject);
+}
+
+static void
+suil_qt_wrapper_class_init(SuilQtWrapperClass* klass)
+{
+	GObjectClass* const gobject_class = G_OBJECT_CLASS(klass);
+
+	gobject_class->finalize = suil_qt_wrapper_finalize;
+}
+
+static void
+suil_qt_wrapper_init(SuilQtWrapper* self)
+{
+	self->qembed     = NULL;
+	self->wrapper    = NULL;
+	self->instance   = NULL;
+	self->idle_iface = NULL;
+	self->idle_id    = 0;
+	self->idle_ms    = 1000 / 30;  // 30 Hz default
+}
+
+static void
+suil_qt_wrapper_realize(GtkWidget* w, gpointer data)
+{
+	SuilQtWrapper* const wrap = SUIL_QT_WRAPPER(w);
+	GtkSocket* const     s    = GTK_SOCKET(w);
+	const WId            id   = (WId)gtk_socket_get_id(s);
+
+	wrap->qembed->winId();
+	wrap->qembed->windowHandle()->setParent(QWindow::fromWinId(id));
+	wrap->qembed->show();
+}
+
+static int
+suil_qt_wrapper_resize(LV2UI_Feature_Handle handle, int width, int height)
+{
+	gtk_widget_set_size_request(GTK_WIDGET(handle), width, height);
+
+	return 0;
+}
+
+static gboolean
+suil_qt_wrapper_idle(void* data)
+{
+	SuilQtWrapper* const wrap = SUIL_QT_WRAPPER(data);
+
+	if (wrap->idle_iface) {
+		wrap->idle_iface->idle(wrap->instance->handle);
+		return TRUE;  // Continue calling
+	}
+
+	return FALSE;
+}
+
+static int
+wrapper_wrap(SuilWrapper*  wrapper,
+             SuilInstance* instance)
+{
+	SuilQtWrapper* const wrap = SUIL_QT_WRAPPER(wrapper->impl);
+
+	wrap->qembed   = new QWidget();
+	wrap->wrapper  = wrapper;
+	wrap->instance = instance;
+
+	QWidget*     qwidget = (QWidget*)instance->ui_widget;
+	QVBoxLayout* layout  = new QVBoxLayout();
+	layout->setMargin(0);
+	layout->setSpacing(0);
+	layout->addWidget(qwidget);
+
+	wrap->qembed->setLayout(layout);
+
+	g_signal_connect_after(G_OBJECT(wrap), "realize",
+	                       G_CALLBACK(suil_qt_wrapper_realize), NULL);
+
+	instance->host_widget = GTK_WIDGET(wrap);
+
+	const LV2UI_Idle_Interface* idle_iface = NULL;
+	if (instance->descriptor->extension_data) {
+		idle_iface = (const LV2UI_Idle_Interface*)
+			instance->descriptor->extension_data(LV2_UI__idleInterface);
+	}
+
+	if (idle_iface) {
+		wrap->idle_iface = idle_iface;
+		wrap->idle_id    = g_timeout_add(
+			wrap->idle_ms, suil_qt_wrapper_idle, wrap);
+	}
+
+	return 0;
+}
+
+static void
+wrapper_free(SuilWrapper* wrapper)
+{
+	if (wrapper->impl) {
+		SuilQtWrapper* const wrap = SUIL_QT_WRAPPER(wrapper->impl);
+		gtk_widget_destroy(GTK_WIDGET(wrap));
+	}
+}
+
+SUIL_LIB_EXPORT
+SuilWrapper*
+suil_wrapper_new(SuilHost*      host,
+                 const char*    host_type_uri,
+                 const char*    ui_type_uri,
+                 LV2_Feature*** features,
+                 unsigned       n_features)
+{
+	SuilWrapper* wrapper = (SuilWrapper*)calloc(1, sizeof(SuilWrapper));
+	wrapper->wrap = wrapper_wrap;
+	wrapper->free = wrapper_free;
+
+	SuilQtWrapper* const wrap = SUIL_QT_WRAPPER(
+		g_object_new(SUIL_TYPE_QT_WRAPPER, NULL));
+
+	wrap->wrapper = NULL;
+	wrapper->impl = wrap;
+
+	wrapper->resize.handle    = wrap;
+	wrapper->resize.ui_resize = suil_qt_wrapper_resize;
+
+	suil_add_feature(features, &n_features, LV2_UI__resize, &wrapper->resize);
+	suil_add_feature(features, &n_features, LV2_UI__idleInterface, NULL);
+
+	// Scan for URID map and options
+	LV2_URID_Map*       map     = NULL;
+	LV2_Options_Option* options = NULL;
+	for (LV2_Feature** f = *features; *f && (!map || !options); ++f) {
+		if (!strcmp((*f)->URI, LV2_OPTIONS__options)) {
+			options = (LV2_Options_Option*)(*f)->data;
+		} else if (!strcmp((*f)->URI, LV2_URID__map)) {
+			map = (LV2_URID_Map*)(*f)->data;
+		}
+	}
+
+	if (map && options) {
+		// Set UI update rate if given
+		LV2_URID ui_updateRate = map->map(map->handle, LV2_UI__updateRate);
+		for (LV2_Options_Option* o = options; o->key; ++o) {
+			if (o->key == ui_updateRate) {
+				wrap->idle_ms = 1000.0f / *(const float*)o->value;
+				break;
+			}
+		}
+	}
+
+	return wrapper;
+}
+
+}  // extern "C"