First draft of a midi preflet.

src/preferences/midi/Jamfile

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+SubDir HAIKU_TOP src preferences midi ;
+
+Preference Midi :
+	MidiApp.cpp
+	MidiView.cpp
+	MidiWindow.cpp
+	: midi be localestub [ TargetLibsupc++ ]
+	;

src/preferences/midi/MidiApp.cpp

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+/*
+ * Copyright 2014, Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+
+#include <Application.h>
+
+#include "MidiWindow.h"
+
+class MidiApp : public BApplication {
+public:
+	MidiApp();
+	virtual void ReadyToRun();
+};
+
+
+int main()
+{
+	MidiApp app;
+	app.Run();
+
+	return 0;
+}
+
+
+MidiApp::MidiApp()
+	:
+	BApplication("application/x-vnd.MidiPreflet")
+{
+
+}
+
+
+/* virtual */
+void
+MidiApp::ReadyToRun()
+{
+	(new MidiWindow())->Show();
+}

src/preferences/midi/MidiView.cpp

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+/*
+ * Copyright 2014, Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+
+#include "MidiView.h"
+
+#include <Box.h>
+#include <Button.h>
+#include <Directory.h>
+#include <Entry.h>
+#include <FindDirectory.h>
+#include <GridView.h>
+#include <LayoutBuilder.h>
+#include <ListView.h>
+
+#include <stdio.h>
+
+const static uint32 kImportSoundFont = 'ImSf';
+
+MidiView::MidiView()
+	:
+	BGroupView(B_VERTICAL, B_USE_DEFAULT_SPACING)
+{
+	BBox* defaultsBox = new BBox("defaults");
+	defaultsBox->SetLabel("Defaults");
+	BGridView* defaultsGridView = new BGridView();
+
+	fListView = new BListView(B_SINGLE_SELECTION_LIST);
+	fImportButton = new BButton("Import SoundFont",
+			new BMessage(kImportSoundFont));
+
+	BLayoutBuilder::Grid<>(defaultsGridView)
+			.SetInsets(B_USE_DEFAULT_SPACING, 0, B_USE_DEFAULT_SPACING,
+					B_USE_DEFAULT_SPACING)
+			.Add(fListView, 0, 0)
+			.Add(fImportButton, 0, 1);
+
+	defaultsBox->AddChild(defaultsGridView);
+
+	BLayoutBuilder::Group<>(this)
+		.SetInsets(0, 0, 0, 0)
+		.Add(defaultsBox)
+		.AddGlue();
+}
+
+
+/* virtual */
+void
+MidiView::AttachedToWindow()
+{
+	fImportButton->SetTarget(this);
+	_RetrieveSoftSynthList();
+}
+
+
+/* virtual */
+void
+MidiView::MessageReceived(BMessage* message)
+{
+	switch (message->what) {
+		case kImportSoundFont:
+			break;
+
+		default:
+			BGroupView::MessageReceived(message);
+			break;
+	}
+}
+
+
+void
+MidiView::_RetrieveSoftSynthList()
+{
+	char **paths = NULL;
+	size_t pathCount = 0;
+	status_t status = find_paths(B_FIND_PATH_DATA_DIRECTORY, "synth",
+			&paths, &pathCount);
+	if (status != B_OK)
+		return;
+
+	fListView->MakeEmpty();
+
+	for (size_t i = 0; i < pathCount; i++) {
+		BDirectory directory(paths[i]);
+		BEntry entry;
+		if (directory.InitCheck() != B_OK)
+			continue;
+		while (directory.GetNextEntry(&entry) == B_OK) {
+			fListView->AddItem(new BStringItem(entry.Name()));
+		}
+	}
+}

src/preferences/midi/MidiView.h

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+/*
+ * Copyright 2014, Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+
+#ifndef MIDIVIEW_H_
+#define MIDIVIEW_H_
+
+
+#include <GroupView.h>
+
+class BButton;
+class BListView;
+class MidiView : public BGroupView {
+public:
+	MidiView();
+	virtual void AttachedToWindow();
+	virtual void MessageReceived(BMessage* message);
+
+private:
+	void _RetrieveSoftSynthList();
+
+	BButton* fImportButton;
+	BListView* fListView;
+};
+
+#endif /* MIDIVIEW_H_ */

src/preferences/midi/MidiWindow.cpp

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+/*
+ * Copyright 2014, Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+
+#include "MidiWindow.h"
+
+#include <LayoutBuilder.h>
+
+#include "MidiView.h"
+
+
+MidiWindow::MidiWindow()
+	:
+	BWindow(BRect(40, 40, 260, 260), "Midi Preferences",
+			B_TITLED_WINDOW, B_SUPPORTS_LAYOUT)
+{
+	fMidiView = new MidiView();
+	BLayoutBuilder::Group<>(this, B_HORIZONTAL)
+		.SetInsets(B_USE_DEFAULT_SPACING, B_USE_DEFAULT_SPACING,
+				B_USE_DEFAULT_SPACING, B_USE_DEFAULT_SPACING)
+		.Add(fMidiView, 0.0f);
+}
+
+

src/preferences/midi/MidiWindow.h

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+/*
+ * Copyright 2014, Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef MIDIWINDOW_H_
+#define MIDIWINDOW_H_
+
+#include <Window.h>
+
+class MidiView;
+class MidiWindow : public BWindow {
+public:
+	MidiWindow();
+private:
+	MidiView* fMidiView;
+};
+
+
+#endif /* MIDIWINDOW_H_ */