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Piano: Use CEventLoop::wake() to trigger repaint from sound thread.

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In order to repaint the GUI after the sound thread has produced some sweet
new waves, we post a CCustomEvent to the main thread's event loop and then
wake up that event loop via CEventLoop::wake().
This commit is contained in:
Andreas Kling 2019-07-14 10:22:28 +02:00
parent 17ee548bcd
commit 1ecb7462b7
3 changed files with 16 additions and 19 deletions
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26
Applications/Piano/main.cpp
View file

@ -1,40 +1,27 @@
#include "Music.h"
#include "PianoWidget.h"
#include <LibCore/CFile.h>
#include <LibCore/CNotifier.h>
#include <LibAudio/AClientConnection.h>
#include <LibCore/CFile.h>
#include <LibCore/CThread.h>
#include <LibGUI/GApplication.h>
#include <LibGUI/GEventLoop.h>
#include <LibGUI/GWindow.h>
static int s_pipefds[2];
int main(int argc, char** argv)
{
AClientConnection audio_connection;
GApplication app(argc, argv);
pipe(s_pipefds);
auto* window = new GWindow;
window->set_title("Piano");
window->set_rect(100, 100, 512, 512);
auto* piano_widget = new PianoWidget;
window->set_main_widget(piano_widget);
window->show();
window->set_icon_path("/res/icons/16x16/app-piano.png");
CNotifier notifier(s_pipefds[0], CNotifier::Read);
notifier.on_ready_to_read = [&] {
char buffer[32];
read(s_pipefds[1], buffer, sizeof(buffer));
piano_widget->update();
};
create_thread([](void* context) -> int {
CThread sound_thread([](void* context) -> int {
auto* piano_widget = (PianoWidget*)context;
CFile audio("/dev/audio");
@ -47,10 +34,11 @@ int main(int argc, char** argv)
u8 buffer[4096];
piano_widget->fill_audio_buffer(buffer, sizeof(buffer));
audio.write(buffer, sizeof(buffer));
char ch = '!';
write(s_pipefds[0], &ch, 1);
GEventLoop::current().post_event(*piano_widget, make<CCustomEvent>(0));
GEventLoop::current().wake();
}
}, piano_widget);
},
piano_widget);
return app.exec();
}