screen_switcher between current and last screen

Setting the new config variable "screen_switcher_browser_only" to "no"
will make the "key_screen_switcher" key switch between the current and
the last used screen, sort of like the Alt+Tab window switching
mechanism in many window managers.

This (intendedly) works only for the "main" screens (playlist, browser,
media library, etc.) and not for info/lyrics/server info. Those screens
can be closed with the screen_switcher key, but the will not be
remembered.

indentation correction in config

src/browser.cpp

@@ -87,6 +87,9 @@ void Browser::SwitchTo()
 		Config.browser_sort_by_mtime = 0;
 	
 	w->Empty() ? myBrowser->GetDirectory(itsBrowsedDir) : myBrowser->UpdateItemList();
+
+	if (myScreen != this && myScreen->isTabbable())
+		myPrevScreen = myScreen;
 	myScreen = this;
 	RedrawHeader = 1;
 }

src/browser.h

@@ -37,6 +37,7 @@ class Browser : public Screen< Menu<MPD::Item> >
 		virtual void EnterPressed();
 		virtual void SpacePressed();
 		virtual void MouseButtonPressed(MEVENT);
+		virtual bool isTabbable() { return true; }
 		
 		virtual MPD::Song *CurrentSong();
 		

src/clock.cpp

@@ -87,6 +87,8 @@ void Clock::SwitchTo()
 	if (hasToBeResized)
 		Resize();
 	
+	if (myScreen != this && myScreen->isTabbable())
+		myPrevScreen = myScreen;
 	myScreen = this;
 	myPlaylist->Items->Hide();
 	RedrawHeader = 1;

src/clock.h

@@ -44,6 +44,7 @@ class Clock : public Screen<Window>
 		virtual void EnterPressed() { }
 		virtual void SpacePressed() { }
 		virtual void MouseButtonPressed(MEVENT) { }
+		virtual bool isTabbable() { return true; }
 		
 		virtual bool allowsSelection() { return false; }
 		

src/global.h

@@ -28,7 +28,9 @@
 namespace Global
 {
 	extern BasicScreen *myScreen;
-	extern BasicScreen *myOldScreen;
+	extern BasicScreen *myOldScreen;	// for info, lyrics, popups
+	extern BasicScreen *myPrevScreen;	// "real" screen switching
+						// 	(browser, search, etc.)
 	
 	extern Window *wHeader;
 	extern Window *wFooter;

src/help.cpp

@@ -55,6 +55,8 @@ void Help::SwitchTo()
 	if (hasToBeResized)
 		Resize();
 	
+	if (myScreen != this && myScreen->isTabbable())
+		myPrevScreen = myScreen;
 	myScreen = this;
 	RedrawHeader = 1;
 
@@ -133,7 +135,10 @@ void Help::GetKeybindings()
 	*w << DisplayKeys(Key.Home)			<< "Home\n";
 	*w << DisplayKeys(Key.End)			<< "End\n";
 	*w << "\n";
-	*w << DisplayKeys(Key.ScreenSwitcher)		<< "Switch between playlist and browser\n";
+	if (Config.screen_switcher_browser_only)
+		*w << DisplayKeys(Key.ScreenSwitcher)   << "Switch between playlist and browser\n";
+	else
+		*w << DisplayKeys(Key.ScreenSwitcher)   << "Switch between current and last screen\n";
 	*w << DisplayKeys(Key.Help)			<< "Help screen\n";
 	*w << DisplayKeys(Key.Playlist)			<< "Playlist screen\n";
 	*w << DisplayKeys(Key.Browser)			<< "Browse screen\n";

src/help.h

@@ -34,6 +34,7 @@ class Help : public Screen<Scrollpad>
 		
 		virtual void EnterPressed() { }
 		virtual void SpacePressed() { }
+		virtual bool isTabbable() { return true; }
 		
 		virtual bool allowsSelection() { return false; }
 		

src/media_library.cpp

@@ -145,6 +145,8 @@ void MediaLibrary::SwitchTo()
 	if (hasToBeResized)
 		Resize();
 	
+	if (myScreen != this && myScreen->isTabbable())
+		myPrevScreen = myScreen;
 	myScreen = this;
 	RedrawHeader = 1;
 	Refresh();

src/media_library.h

@@ -48,6 +48,7 @@ class MediaLibrary : public Screen<Window>
 		virtual void EnterPressed() { AddToPlaylist(1); }
 		virtual void SpacePressed();
 		virtual void MouseButtonPressed(MEVENT);
+		virtual bool isTabbable() { return true; }
 		
 		virtual MPD::Song *CurrentSong();
 		

src/ncmpcpp.cpp

@@ -73,6 +73,7 @@ using namespace MPD;
 
 BasicScreen *Global::myScreen;
 BasicScreen *Global::myOldScreen;
+BasicScreen *Global::myPrevScreen;
 
 Window *Global::wHeader;
 Window *Global::wFooter;
@@ -276,6 +277,12 @@ int main(int argc, char *argv[])
 	wFooter->AddFDCallback(Mpd.GetFD(), StatusbarMPDCallback);
 	wFooter->CreateHistory();
 	
+	// initialize screens to browser as default previous screen
+	myScreen = myBrowser;
+	myPrevScreen = myBrowser;
+	myOldScreen = myBrowser;
+
+	// go to playlist
 	myPlaylist->SwitchTo();
 	myPlaylist->UpdateTimer();
 	
@@ -1915,10 +1922,20 @@ int main(int argc, char *argv[])
 		}
 		else if (Keypressed(input, Key.ScreenSwitcher))
 		{
-			if (myScreen == myPlaylist)
-				myBrowser->SwitchTo();
+			if (Config.screen_switcher_browser_only)
+			{
+				if (myScreen == myPlaylist)
+					myBrowser->SwitchTo();
+				else
+					myPlaylist->SwitchTo();
+			}
 			else
-				myPlaylist->SwitchTo();
+			{
+				if (myScreen->isTabbable())
+					myPrevScreen->SwitchTo();
+				else
+					myOldScreen->SwitchTo();
+			}
 		}
 		else if (Keypressed(input, Key.Playlist))
 		{

src/outputs.cpp

@@ -51,6 +51,8 @@ void Outputs::SwitchTo()
 	if (hasToBeResized)
 		Resize();
 	
+	if (myScreen != this && myScreen->isTabbable())
+		myPrevScreen = myScreen;
 	myScreen = this;
 	w->Window::Clear();
 	

src/outputs.h

@@ -42,6 +42,7 @@ class Outputs : public Screen< Menu<MPD::Output> >
 		virtual void EnterPressed();
 		virtual void SpacePressed() { }
 		virtual void MouseButtonPressed(MEVENT);
+		virtual bool isTabbable() { return true; }
 		
 		virtual bool allowsSelection() { return false; }
 		

src/playlist.cpp

@@ -97,6 +97,8 @@ void Playlist::SwitchTo()
 	if (hasToBeResized)
 		Resize();
 	
+	if (myScreen != this && myScreen->isTabbable())
+		myPrevScreen = myScreen;
 	myScreen = this;
 	Items->Window::Clear();
 	EnableHighlighting();

src/playlist.h

@@ -41,6 +41,7 @@ class Playlist : public Screen<Window>
 		virtual void EnterPressed();
 		virtual void SpacePressed();
 		virtual void MouseButtonPressed(MEVENT);
+		virtual bool isTabbable() { return true; }
 		
 		virtual MPD::Song *CurrentSong();
 		

src/playlist_editor.cpp

@@ -102,6 +102,8 @@ void PlaylistEditor::SwitchTo()
 	if (hasToBeResized)
 		Resize();
 	
+	if (myScreen != this && myScreen->isTabbable())
+		myPrevScreen = myScreen;
 	myScreen = this;
 	RedrawHeader = 1;
 	Refresh();

src/playlist_editor.h

@@ -37,6 +37,7 @@ class PlaylistEditor : public Screen<Window>
 		virtual void EnterPressed() { AddToPlaylist(1); }
 		virtual void SpacePressed();
 		virtual void MouseButtonPressed(MEVENT);
+		virtual bool isTabbable() { return true; }
 		
 		virtual MPD::Song *CurrentSong();
 		

src/screen.h

@@ -118,6 +118,11 @@ class BasicScreen
 		/// cast to List if available or null pointer otherwise
 		///
 		virtual List *GetList() = 0;
+
+		/// When this is overwritten with a function returning true, the
+		/// screen will be used in tab switching.
+		///
+		virtual bool isTabbable() { return false; }
 		
 		/// Should be set to true each time screen needs resize
 		///

src/search_engine.cpp

@@ -89,6 +89,9 @@ void SearchEngine::SwitchTo()
 	
 	if (w->Empty())
 		Prepare();
+
+	if (myScreen != this && myScreen->isTabbable())
+		myPrevScreen = myScreen;
 	myScreen = this;
 	RedrawHeader = 1;
 	

src/search_engine.h

@@ -35,6 +35,7 @@ class SearchEngine : public Screen< Menu< std::pair<Buffer *, MPD::Song *> > >
 		virtual void EnterPressed();
 		virtual void SpacePressed();
 		virtual void MouseButtonPressed(MEVENT);
+		virtual bool isTabbable() { return true; }
 		
 		virtual MPD::Song *CurrentSong();
 		

src/settings.cpp

@@ -294,6 +294,7 @@ void DefaultConfiguration(ncmpcpp_config &conf)
 	conf.header_text_scrolling = true;
 	conf.statusbar_visibility = true;
 	conf.centered_cursor = false;
+	conf.screen_switcher_browser_only = true;
 	conf.autocenter_mode = false;
 	conf.wrapped_search = true;
 	conf.space_selects = false;
@@ -754,6 +755,10 @@ void ReadConfiguration(ncmpcpp_config &conf)
 			{
 				conf.statusbar_visibility = v == "yes";
 			}
+			else if (cl.find("screen_switcher_browser_only") != std::string::npos)
+			{
+				conf.screen_switcher_browser_only = v == "yes";
+			}
 			else if (cl.find("autocenter_mode") != std::string::npos)
 			{
 				conf.autocenter_mode = v == "yes";

src/settings.h

@@ -187,6 +187,7 @@ struct ncmpcpp_config
 	bool header_text_scrolling;
 	bool statusbar_visibility;
 	bool centered_cursor;
+	bool screen_switcher_browser_only;
 	bool autocenter_mode;
 	bool wrapped_search;
 	bool space_selects;

src/tag_editor.cpp

@@ -42,6 +42,7 @@ using Global::MainHeight;
 using Global::MainStartY;
 using Global::myOldScreen;
 using Global::myScreen;
+using Global::myPrevScreen;
 using Global::wFooter;
 
 TagEditor *myTagEditor = new TagEditor;
@@ -197,6 +198,8 @@ void TagEditor::SwitchTo()
 	if (hasToBeResized)
 		Resize();
 	
+	if (myScreen != this && myScreen->isTabbable())
+		myPrevScreen = myScreen;
 	myScreen = this;
 	Global::RedrawHeader = 1;
 	Refresh();

src/tag_editor.h

@@ -53,6 +53,7 @@ class TagEditor : public Screen<Window>
 		virtual void EnterPressed();
 		virtual void SpacePressed();
 		virtual void MouseButtonPressed(MEVENT);
+		virtual bool isTabbable() { return true; }
 		
 		virtual MPD::Song *CurrentSong();
 		

src/visualizer.cpp

@@ -32,6 +32,7 @@
 #include <sys/time.h>
 
 using Global::myScreen;
+using Global::myPrevScreen;
 using Global::MainStartY;
 using Global::MainHeight;
 
@@ -70,6 +71,8 @@ void Visualizer::SwitchTo()
 	if (hasToBeResized)
 		Resize();
 	
+	if (myScreen != this && myScreen->isTabbable())
+		myPrevScreen = myScreen;
 	myScreen = this;
 	w->Clear();
 	

src/visualizer.h

@@ -48,6 +48,7 @@ class Visualizer : public Screen<Window>
 		virtual void EnterPressed() { }
 		virtual void SpacePressed();
 		virtual void MouseButtonPressed(MEVENT) { }
+		virtual bool isTabbable() { return true; }
 		
 		virtual NCurses::List *GetList() { return 0; }