GUI mixins

Classes
struct	LV2::NoUserResize< Required >
struct	LV2::FixedSize< Required >
struct	LV2::Presets< Required >
struct	LV2::WriteMIDI< Required >
struct	LV2::URIMap< Required >

Detailed Description

  These classes implement extra functionality that you may want to have
  in your GUI class, just like the @ref pluginmixins "plugin mixins" do
  for plugin classes. Some of them are template classes with a boolean
  @c Required parameter - if this is true the GUI will fail to instantiate
  unless the host supports the extension implemented by that mixin.
  For example, if you wanted a GUI that wrote a MIDI Note On event to port
  3 in the plugin whenever the user clicked a button, you could do it like
  this:

  @code 

#include <lv2gui.hpp> #include <gtkmm.h>

class MyGUI : public LV2::GUI<MyGUI, LV2::URIMap<true>, LV2::WriteMIDI<true> > { public: MyGUI(const char* plugin_uri) : m_button("Click me!") { pack_start(m_button); m_button.signal_clicked().connect(sigc::mem_fun(*this, &MyGUI::send_event)); } protected: void send_event() { uint8_t noteon[] = { 0x90, 0x50, 0x40 }; write_midi(3, 3, noteon); } Gtk::Button m_button; };

The function write_midi() is implemented in LV2::WriteMIDI and thus available in MyGUI. LV2::WriteMIDI requires that LV2::URIMap is also used (because of the way event types work in LV2) - if you don't add LV2::URIMap as well you will get a compilation error.