screen: click on progress bar seeks current song

Closes #135

NEWS

@@ -10,6 +10,7 @@ ncmpc 0.50 - not yet released
 * lyrics/google: fix partial loading of lyrics
 * support MPD 0.22 tag "label" (requires libmpdclient 2.17)
 * fix config file overriding MPD_HOST environment variable
+* click on progress bar seeks current song
 
 ncmpc 0.49 - (2023-08-04)
 * fix UI freeze if lyrics plugin is stuck

src/ProgressBar.hxx

@@ -20,6 +20,15 @@ public:
 
 	bool Set(unsigned current, unsigned max) noexcept;
 
+	int ValueAtX(int x) const noexcept {
+		if (max == 0 || x < 0)
+			return -1;
+
+		const unsigned ux = static_cast<unsigned>(x);
+		const unsigned window_width = window.GetWidth();
+		return ux * max / window_width;
+	}
+
 	void Paint() const noexcept;
 
 private:

src/screen.cxx

@@ -305,6 +305,33 @@ ScreenManager::OnCommand(struct mpdclient &c, DelayedSeek &seek, Command cmd)
 
 #ifdef HAVE_GETMOUSE
 
+inline void
+ScreenManager::OnProgressBarMouse(struct mpdclient &c, DelayedSeek &seek,
+				  int x, mmask_t bstate)
+{
+	if (bstate & BUTTON1_CLICKED) {
+		if (!c.IsReady() || !c.playing_or_paused)
+			return;
+
+		const int time = progress_bar.ValueAtX(x);
+		if (time < 0)
+			return;
+
+		const int id = c.GetCurrentSongId();
+		if (id < 0)
+			return;
+
+		seek.Cancel();
+
+		struct mpd_connection *connection = c.GetConnection();
+		if (connection == nullptr)
+			return;
+
+		if (!mpd_run_seek_id(connection, id, time))
+			c.HandleError();
+	}
+}
+
 void
 ScreenManager::OnMouse(struct mpdclient &c, DelayedSeek &seek,
 		       Point p, mmask_t bstate)
@@ -318,6 +345,16 @@ ScreenManager::OnMouse(struct mpdclient &c, DelayedSeek &seek,
 		p.y -= title_height;
 	}
 
+	if (int main_height = main_window.GetSize().height; p.y >= main_height) {
+		p.y -= main_height;
+
+		if (p.y == 0) {
+			OnProgressBarMouse(c, seek, p.x, bstate);
+		}
+
+		return;
+	}
+
 	if (GetCurrentPage().OnMouse(c, p, bstate))
 		return;
 

src/screen.hxx

@@ -123,6 +123,8 @@ public:
 	void OnCommand(struct mpdclient &c, DelayedSeek &seek, Command cmd);
 
 #ifdef HAVE_GETMOUSE
+	void OnProgressBarMouse(struct mpdclient &c, DelayedSeek &seek,
+				int x, mmask_t bstate);
 	void OnMouse(struct mpdclient &c, DelayedSeek &seek,
 		     Point p, mmask_t bstate);
 #endif