refactor *Screen classes, add InfoScreen superclass

10 files changed, 421 insertions, 407 deletions

diff --git a/Action.c b/Action.c
index e60a7f23..e53f5688 100644
--- a/Action.c
+++ b/Action.c
@@ -346,9 +346,9 @@ static Htop_Reaction actionSetup(State* st) {
 static Htop_Reaction actionLsof(State* st) {
    Process* p = (Process*) Panel_getSelected(st->panel);
    if (!p) return HTOP_OK;
-   OpenFilesScreen* ts = OpenFilesScreen_new(p);
-   OpenFilesScreen_run(ts);
-   OpenFilesScreen_delete(ts);
+   OpenFilesScreen* ofs = OpenFilesScreen_new(p);
+   InfoScreen_run((InfoScreen*)ofs);
+   OpenFilesScreen_delete((Object*)ofs);
    clear();
    CRT_enableDelay();
    return HTOP_REFRESH | HTOP_REDRAW_BAR;
@@ -358,8 +358,11 @@ static Htop_Reaction actionStrace(State* st) {
    Process* p = (Process*) Panel_getSelected(st->panel);
    if (!p) return HTOP_OK;
    TraceScreen* ts = TraceScreen_new(p);
-   TraceScreen_run(ts);
-   TraceScreen_delete(ts);
+   bool ok = TraceScreen_forkTracer(ts);
+   if (ok) {
+      InfoScreen_run((InfoScreen*)ts);
+   }
+   TraceScreen_delete((Object*)ts);
    clear();
    CRT_enableDelay();
    return HTOP_REFRESH | HTOP_REDRAW_BAR;
@@ -504,9 +507,9 @@ static Htop_Reaction actionTagAllChildren(State* st) {
 static Htop_Reaction actionShowEnvScreen(State* st) {
    Process* p = (Process*) Panel_getSelected(st->panel);
    if (!p) return HTOP_OK;
-   EnvScreen* ts = EnvScreen_new(p);
-   EnvScreen_run(ts);
-   EnvScreen_delete(ts);
+   EnvScreen* es = EnvScreen_new(p);
+   InfoScreen_run((InfoScreen*)es);
+   EnvScreen_delete((Object*)es);
    clear();
    CRT_enableDelay();
    return HTOP_REFRESH | HTOP_REDRAW_BAR;
diff --git a/EnvScreen.c b/EnvScreen.c
index 1881b1ff..f8645ed5 100644
--- a/EnvScreen.c
+++ b/EnvScreen.c
@@ -12,52 +12,37 @@
 #include <unistd.h>
 
 /*{
-#include "ProcessList.h"
-#include "Panel.h"
-#include "FunctionBar.h"
+#include "InfoScreen.h"
 
 typedef struct EnvScreen_ {
-   Process* process;
-   Panel* display;
-   FunctionBar* bar;
+   InfoScreen super;
 } EnvScreen;
 }*/
 
-static const char* EnvScreenFunctions[] = {"Search ", "Filter ", "Refresh", "Done   ", NULL};
-
-static const char* EnvScreenKeys[] = {"F3", "F4", "F5", "Esc"};
-
-static int EnvScreenEvents[] = {KEY_F(3), KEY_F(4), KEY_F(5), 27};
+InfoScreenClass EnvScreen_class = {
+   .super = {
+      .extends = Class(Object),
+      .delete = EnvScreen_delete
+   },
+   .scan = EnvScreen_scan,
+   .draw = EnvScreen_draw
+};
 
 EnvScreen* EnvScreen_new(Process* process) {
    EnvScreen* this = malloc(sizeof(EnvScreen));
-   this->process = process;
-   FunctionBar* bar = FunctionBar_new(EnvScreenFunctions, EnvScreenKeys, EnvScreenEvents);
-   this->display = Panel_new(0, 1, COLS, LINES-3, false, Class(ListItem), bar);
-   return this;
+   Object_setClass(this, Class(EnvScreen));
+   return (EnvScreen*) InfoScreen_init(&this->super, process, NULL, LINES-3, " ");
 }
 
-void EnvScreen_delete(EnvScreen* this) {
-   Panel_delete((Object*)this->display);
-   free(this);
+void EnvScreen_delete(Object* this) {
+   free(InfoScreen_done((InfoScreen*)this));
 }
 
-static void EnvScreen_draw(EnvScreen* this, IncSet* inc) {
-   attrset(CRT_colors[METER_TEXT]);
-   mvhline(0, 0, ' ', COLS);
-   mvprintw(0, 0, "environment of process %d - %s", this->process->pid, this->process->comm);
-   attrset(CRT_colors[DEFAULT_COLOR]);
-   Panel_draw(this->display, true);
-   IncSet_drawBar(inc);
+void EnvScreen_draw(InfoScreen* this) {
+   InfoScreen_drawTitled(this, "Environment of process %d - %s", this->process->pid, this->process->comm);
 }
 
-static inline void addLine(const char* line, Vector* lines, Panel* panel, const char* incFilter) {
-   Vector_add(lines, (Object*) ListItem_new(line, 0));
-   if (!incFilter || String_contains_i(line, incFilter))
-      Panel_add(panel, (Object*)Vector_get(lines, Vector_size(lines)-1));
-}
-
-static void EnvScreen_scan(EnvScreen* this, Vector* lines, IncSet* inc) {
+void EnvScreen_scan(InfoScreen* this) {
    Panel* panel = this->display;
    int idx = MAX(Panel_getSelectedIndex(panel), 0);
 
@@ -69,89 +54,14 @@ static void EnvScreen_scan(EnvScreen* this, Vector* lines, IncSet* inc) {
    seteuid(euid);
    if (env) {
       for (char *p = env; *p; p = strrchr(p, 0)+1)
-         addLine(p, lines, panel, IncSet_filter(inc));
+         InfoScreen_addLine(this, p);
       free(env);
    }
    else {
-      addLine("Could not read process environment.", lines, panel, IncSet_filter(inc));
+      InfoScreen_addLine(this, "Could not read process environment.");
    }
 
-   Vector_insertionSort(lines);
+   Vector_insertionSort(this->lines);
    Vector_insertionSort(panel->items);
    Panel_setSelected(panel, idx);
 }
-
-void EnvScreen_run(EnvScreen* this) {
-   Panel* panel = this->display;
-   Panel_setHeader(panel, " ");
-
-   FunctionBar* bar = panel->defaultBar;
-   IncSet* inc = IncSet_new(bar);
-
-   Vector* lines = Vector_new(panel->items->type, true, DEFAULT_SIZE);
-
-   EnvScreen_scan(this, lines, inc);
-   EnvScreen_draw(this, inc);
-
-   bool looping = true;
-   while (looping) {
-
-      Panel_draw(panel, true);
-
-      if (inc->active)
-         move(LINES-1, CRT_cursorX);
-      int ch = getch();
-
-      if (ch == KEY_MOUSE) {
-         MEVENT mevent;
-         int ok = getmouse(&mevent);
-         if (ok == OK)
-            if (mevent.y >= panel->y && mevent.y < LINES - 1) {
-               Panel_setSelected(panel, mevent.y - panel->y + panel->scrollV);
-               ch = 0;
-            } if (mevent.y == LINES - 1)
-               ch = IncSet_synthesizeEvent(inc, mevent.x);
-      }
-
-      if (inc->active) {
-         IncSet_handleKey(inc, ch, panel, IncSet_getListItemValue, lines);
-         continue;
-      }
-
-      switch(ch) {
-      case ERR:
-         continue;
-      case KEY_F(3):
-      case '/':
-         IncSet_activate(inc, INC_SEARCH, panel);
-         break;
-      case KEY_F(4):
-      case '\\':
-         IncSet_activate(inc, INC_FILTER, panel);
-         break;
-      case KEY_F(5):
-         clear();
-         EnvScreen_scan(this, lines, inc);
-         EnvScreen_draw(this, inc);
-         break;
-      case '\014': // Ctrl+L
-         clear();
-         EnvScreen_draw(this, inc);
-         break;
-      case 'q':
-      case 27:
-      case KEY_F(10):
-         looping = false;
-         break;
-      case KEY_RESIZE:
-         Panel_resize(panel, COLS, LINES-2);
-         EnvScreen_draw(this, inc);
-         break;
-      default:
-         Panel_onKey(panel, ch);
-      }
-   }
-
-   Vector_delete(lines);
-   IncSet_delete(inc);
-}
diff --git a/EnvScreen.h b/EnvScreen.h
index f33f0591..7cdbb865 100644
--- a/EnvScreen.h
+++ b/EnvScreen.h
@@ -3,20 +3,20 @@
 #ifndef HEADER_EnvScreen
 #define HEADER_EnvScreen
 
-#include "ProcessList.h"
-#include "Panel.h"
-#include "FunctionBar.h"
+#include "InfoScreen.h"
 
 typedef struct EnvScreen_ {
-   Process* process;
-   Panel* display;
-   FunctionBar* bar;
+   InfoScreen super;
 } EnvScreen;
 
+extern InfoScreenClass EnvScreen_class;
+
 EnvScreen* EnvScreen_new(Process* process);
 
-void EnvScreen_delete(EnvScreen* this);
+void EnvScreen_delete(Object* this);
+
+void EnvScreen_draw(InfoScreen* this);
 
-void EnvScreen_run(EnvScreen* this);
+void EnvScreen_scan(InfoScreen* this);
 
 #endif
diff --git a/InfoScreen.c b/InfoScreen.c
new file mode 100644
index 00000000..7ce9ca6a
--- /dev/null
+++ b/InfoScreen.c
@@ -0,0 +1,180 @@
+#include "InfoScreen.h"
+
+#include "config.h"
+#include "Object.h"
+#include "CRT.h"
+#include "IncSet.h"
+#include "ListItem.h"
+#include "Platform.h"
+#include "StringUtils.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdarg.h>
+
+/*{
+#include "Process.h"
+#include "Panel.h"
+#include "FunctionBar.h"
+#include "IncSet.h"
+
+typedef struct InfoScreen_ InfoScreen;
+
+typedef void(*InfoScreen_Scan)(InfoScreen*);
+typedef void(*InfoScreen_Draw)(InfoScreen*);
+typedef void(*InfoScreen_OnErr)(InfoScreen*);
+typedef bool(*InfoScreen_OnKey)(InfoScreen*, int);
+
+typedef struct InfoScreenClass_ {
+   ObjectClass super;
+   const InfoScreen_Scan scan;
+   const InfoScreen_Draw draw;
+   const InfoScreen_OnErr onErr;
+   const InfoScreen_OnKey onKey;
+} InfoScreenClass;
+
+#define As_InfoScreen(this_)          ((InfoScreenClass*)(((InfoScreen*)(this_))->super.klass))
+#define InfoScreen_scan(this_)        As_InfoScreen(this_)->scan((InfoScreen*)(this_))
+#define InfoScreen_draw(this_)        As_InfoScreen(this_)->draw((InfoScreen*)(this_))
+#define InfoScreen_onErr(this_)       As_InfoScreen(this_)->onErr((InfoScreen*)(this_))
+#define InfoScreen_onKey(this_, ch_)  As_InfoScreen(this_)->onKey((InfoScreen*)(this_), ch_)
+
+struct InfoScreen_ {
+   Object super;
+   Process* process;
+   Panel* display;
+   FunctionBar* bar;
+   IncSet* inc;
+   Vector* lines;
+};
+}*/
+
+static const char* InfoScreenFunctions[] = {"Search ", "Filter ", "Refresh", "Done   ", NULL};
+
+static const char* InfoScreenKeys[] = {"F3", "F4", "F5", "Esc"};
+
+static int InfoScreenEvents[] = {KEY_F(3), KEY_F(4), KEY_F(5), 27};
+
+InfoScreen* InfoScreen_init(InfoScreen* this, Process* process, FunctionBar* bar, int height, char* panelHeader) {
+   this->process = process;
+   if (!bar) {
+      bar = FunctionBar_new(InfoScreenFunctions, InfoScreenKeys, InfoScreenEvents);
+   }
+   this->display = Panel_new(0, 1, COLS, height, false, Class(ListItem), bar);
+   this->inc = IncSet_new(bar);
+   this->lines = Vector_new(this->display->items->type, true, DEFAULT_SIZE);
+   Panel_setHeader(this->display, panelHeader);
+   return this;
+}
+
+InfoScreen* InfoScreen_done(InfoScreen* this) {
+   Panel_delete((Object*)this->display);
+   IncSet_delete(this->inc);
+   Vector_delete(this->lines);
+   return this;
+}
+
+void InfoScreen_drawTitled(InfoScreen* this, char* fmt, ...) {
+   va_list ap;
+   va_start(ap, fmt);
+   attrset(CRT_colors[METER_TEXT]);
+   mvhline(0, 0, ' ', COLS);
+   wmove(stdscr, 0, 0);
+   vw_printw(stdscr, fmt, ap);
+   attrset(CRT_colors[DEFAULT_COLOR]);
+   Panel_draw(this->display, true);
+   IncSet_drawBar(this->inc);
+   va_end(ap);
+}
+
+void InfoScreen_addLine(InfoScreen* this, const char* line) {
+   Vector_add(this->lines, (Object*) ListItem_new(line, 0));
+   const char* incFilter = IncSet_filter(this->inc);
+   if (!incFilter || String_contains_i(line, incFilter))
+      Panel_add(this->display, (Object*)Vector_get(this->lines, Vector_size(this->lines)-1));
+}
+
+void InfoScreen_appendLine(InfoScreen* this, const char* line) {
+   ListItem* last = (ListItem*)Vector_get(this->lines, Vector_size(this->lines)-1);
+   ListItem_append(last, line);
+   const char* incFilter = IncSet_filter(this->inc);
+   if (incFilter && Panel_get(this->display, Panel_size(this->display)-1) != (Object*)last && String_contains_i(line, incFilter))
+      Panel_add(this->display, (Object*)last);
+}
+
+void InfoScreen_run(InfoScreen* this) {
+   Panel* panel = this->display;
+
+   if (As_InfoScreen(this)->scan) InfoScreen_scan(this);
+   InfoScreen_draw(this);
+
+   bool looping = true;
+   while (looping) {
+
+      Panel_draw(panel, true);
+
+      if (this->inc->active)
+         move(LINES-1, CRT_cursorX);
+      int ch = getch();
+      
+      if (ch == ERR) {
+         if (As_InfoScreen(this)->onErr) {
+            InfoScreen_onErr(this);
+            continue;
+         }
+      }
+
+      if (ch == KEY_MOUSE) {
+         MEVENT mevent;
+         int ok = getmouse(&mevent);
+         if (ok == OK)
+            if (mevent.y >= panel->y && mevent.y < LINES - 1) {
+               Panel_setSelected(panel, mevent.y - panel->y + panel->scrollV);
+               ch = 0;
+            } if (mevent.y == LINES - 1)
+               ch = IncSet_synthesizeEvent(this->inc, mevent.x);
+      }
+
+      if (this->inc->active) {
+         IncSet_handleKey(this->inc, ch, panel, IncSet_getListItemValue, this->lines);
+         continue;
+      }
+      
+      switch(ch) {
+      case ERR:
+         continue;
+      case KEY_F(3):
+      case '/':
+         IncSet_activate(this->inc, INC_SEARCH, panel);
+         break;
+      case KEY_F(4):
+      case '\\':
+         IncSet_activate(this->inc, INC_FILTER, panel);
+         break;
+      case KEY_F(5):
+         clear();
+         if (As_InfoScreen(this)->scan) InfoScreen_scan(this);
+         InfoScreen_draw(this);
+         break;
+      case '\014': // Ctrl+L
+         clear();
+         InfoScreen_draw(this);
+         break;
+      case 'q':
+      case 27:
+      case KEY_F(10):
+         looping = false;
+         break;
+      case KEY_RESIZE:
+         Panel_resize(panel, COLS, LINES-2);
+         InfoScreen_draw(this);
+         break;
+      default:
+         if (As_InfoScreen(this)->onKey && InfoScreen_onKey(this, ch)) {
+            continue;
+         }
+         Panel_onKey(panel, ch);
+      }
+   }
+}
diff --git a/InfoScreen.h b/InfoScreen.h
new file mode 100644
index 00000000..2e1599f9
--- /dev/null
+++ b/InfoScreen.h
@@ -0,0 +1,53 @@
+/* Do not edit this file. It was automatically generated. */
+
+#ifndef HEADER_InfoScreen
+#define HEADER_InfoScreen
+
+#include "Process.h"
+#include "Panel.h"
+#include "FunctionBar.h"
+#include "IncSet.h"
+
+typedef struct InfoScreen_ InfoScreen;
+
+typedef void(*InfoScreen_Scan)(InfoScreen*);
+typedef void(*InfoScreen_Draw)(InfoScreen*);
+typedef void(*InfoScreen_OnErr)(InfoScreen*);
+typedef bool(*InfoScreen_OnKey)(InfoScreen*, int);
+
+typedef struct InfoScreenClass_ {
+   ObjectClass super;
+   const InfoScreen_Scan scan;
+   const InfoScreen_Draw draw;
+   const InfoScreen_OnErr onErr;
+   const InfoScreen_OnKey onKey;
+} InfoScreenClass;
+
+#define As_InfoScreen(this_)          ((InfoScreenClass*)(((InfoScreen*)(this_))->super.klass))
+#define InfoScreen_scan(this_)        As_InfoScreen(this_)->scan((InfoScreen*)(this_))
+#define InfoScreen_draw(this_)        As_InfoScreen(this_)->draw((InfoScreen*)(this_))
+#define InfoScreen_onErr(this_)       As_InfoScreen(this_)->onErr((InfoScreen*)(this_))
+#define InfoScreen_onKey(this_, ch_)  As_InfoScreen(this_)->onKey((InfoScreen*)(this_), ch_)
+
+struct InfoScreen_ {
+   Object super;
+   Process* process;
+   Panel* display;
+   FunctionBar* bar;
+   IncSet* inc;
+   Vector* lines;
+};
+
+InfoScreen* InfoScreen_init(InfoScreen* this, Process* process, FunctionBar* bar, int height, char* panelHeader);
+
+InfoScreen* InfoScreen_done(InfoScreen* this);
+
+void InfoScreen_drawTitled(InfoScreen* this, char* fmt, ...);
+
+void InfoScreen_addLine(InfoScreen* this, const char* line);
+
+void InfoScreen_appendLine(InfoScreen* this, const char* line);
+
+void InfoScreen_run(InfoScreen* this);
+
+#endif
diff --git a/Makefile.am b/Makefile.am
index 2861e10b..df122595 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -23,7 +23,8 @@ LoadAverageMeter.c MemoryMeter.c Meter.c MetersPanel.c Object.c Panel.c \
 BatteryMeter.c Process.c ProcessList.c RichString.c ScreenManager.c Settings.c \
 SignalsPanel.c StringUtils.c SwapMeter.c TasksMeter.c UptimeMeter.c \
 TraceScreen.c UsersTable.c Vector.c AvailableColumnsPanel.c AffinityPanel.c \
-HostnameMeter.c OpenFilesScreen.c Affinity.c IncSet.c Action.c EnvScreen.c
+HostnameMeter.c OpenFilesScreen.c Affinity.c IncSet.c Action.c EnvScreen.c \
+InfoScreen.c
 
 myhtopheaders = AvailableColumnsPanel.h AvailableMetersPanel.h \
 CategoriesPanel.h CheckItem.h ClockMeter.h ColorsPanel.h ColumnsPanel.h \
@@ -33,7 +34,7 @@ BatteryMeter.h Meter.h MetersPanel.h Object.h Panel.h ProcessList.h RichString.h
 ScreenManager.h Settings.h SignalsPanel.h StringUtils.h SwapMeter.h \
 TasksMeter.h UptimeMeter.h TraceScreen.h UsersTable.h Vector.h Process.h \
 AffinityPanel.h HostnameMeter.h OpenFilesScreen.h Affinity.h IncSet.h Action.h \
-EnvScreen.h
+EnvScreen.h InfoScreen.h
 
 if HTOP_LINUX
 htop_CFLAGS += -rdynamic 
diff --git a/OpenFilesScreen.c b/OpenFilesScreen.c
index 2a5e20af..096ed939 100644
--- a/OpenFilesScreen.c
+++ b/OpenFilesScreen.c
@@ -9,7 +9,6 @@ in the source distribution for its full text.
 
 #include "CRT.h"
 #include "ProcessList.h"
-#include "ListItem.h"
 #include "IncSet.h"
 #include "StringUtils.h"
 #include "FunctionBar.h"
@@ -25,8 +24,7 @@ in the source distribution for its full text.
 #include <sys/wait.h>
 
 /*{
-#include "Process.h"
-#include "Panel.h"
+#include "InfoScreen.h"
 
 typedef struct OpenFiles_Data_ {
    char* data[256];
@@ -44,43 +42,37 @@ typedef struct OpenFiles_FileData_ {
 } OpenFiles_FileData;
 
 typedef struct OpenFilesScreen_ {
-   Process* process;
+   InfoScreen super;
    pid_t pid;
-   Panel* display;
 } OpenFilesScreen;
 
 }*/
 
-static const char* OpenFilesScreenFunctions[] = {"Search ", "Filter ", "Refresh", "Done   ", NULL};
-
-static const char* OpenFilesScreenKeys[] = {"F3", "F4", "F5", "Esc"};
-
-static int OpenFilesScreenEvents[] = {KEY_F(3), KEY_F(4), KEY_F(5), 27};
+InfoScreenClass OpenFilesScreen_class = {
+   .super = {
+      .extends = Class(Object),
+      .delete = OpenFilesScreen_delete
+   },
+   .scan = OpenFilesScreen_scan,
+   .draw = OpenFilesScreen_draw
+};
 
 OpenFilesScreen* OpenFilesScreen_new(Process* process) {
    OpenFilesScreen* this = malloc(sizeof(OpenFilesScreen));
-   this->process = process;
-   FunctionBar* bar = FunctionBar_new(OpenFilesScreenFunctions, OpenFilesScreenKeys, OpenFilesScreenEvents);
-   this->display = Panel_new(0, 1, COLS, LINES-3, false, Class(ListItem), bar);
+   Object_setClass(this, Class(OpenFilesScreen));
    if (Process_isThread(process))
       this->pid = process->tgid;
    else
       this->pid = process->pid;
-   return this;
+   return (OpenFilesScreen*) InfoScreen_init(&this->super, process, NULL, LINES-3, "   FD TYPE     DEVICE       SIZE       NODE NAME");
 }
 
-void OpenFilesScreen_delete(OpenFilesScreen* this) {
-   Panel_delete((Object*)this->display);
-   free(this);
+void OpenFilesScreen_delete(Object* this) {
+   free(InfoScreen_done((InfoScreen*)this));
 }
 
-static void OpenFilesScreen_draw(OpenFilesScreen* this, IncSet* inc) {
-   attrset(CRT_colors[METER_TEXT]);
-   mvhline(0, 0, ' ', COLS);
-   mvprintw(0, 0, "Snapshot of files open in process %d - %s", this->pid, this->process->comm);
-   attrset(CRT_colors[DEFAULT_COLOR]);
-   Panel_draw(this->display, true);
-   IncSet_drawBar(inc);
+void OpenFilesScreen_draw(InfoScreen* this) {
+   InfoScreen_drawTitled(this, "Snapshot of files open in process %d - %s", ((OpenFilesScreen*)this)->pid, this->process->comm);
 }
 
 static OpenFiles_ProcessData* OpenFilesScreen_getProcessData(pid_t pid) {
@@ -122,27 +114,21 @@ static OpenFiles_ProcessData* OpenFilesScreen_getProcessData(pid_t pid) {
    return pdata;
 }
 
-static inline void addLine(const char* line, Vector* lines, Panel* panel, const char* incFilter) {
-   Vector_add(lines, (Object*) ListItem_new(line, 0));
-   if (!incFilter || String_contains_i(line, incFilter))
-      Panel_add(panel, (Object*)Vector_get(lines, Vector_size(lines)-1));
-}
-
 static inline void OpenFiles_Data_clear(OpenFiles_Data* data) {
    for (int i = 0; i < 255; i++)
       if (data->data[i])
          free(data->data[i]);
 }
 
-static void OpenFilesScreen_scan(OpenFilesScreen* this, Vector* lines, IncSet* inc) {
+void OpenFilesScreen_scan(InfoScreen* this) {
    Panel* panel = this->display;
    int idx = Panel_getSelectedIndex(panel);
    Panel_prune(panel);
-   OpenFiles_ProcessData* pdata = OpenFilesScreen_getProcessData(this->pid);
+   OpenFiles_ProcessData* pdata = OpenFilesScreen_getProcessData(((OpenFilesScreen*)this)->pid);
    if (pdata->error == 127) {
-      addLine("Could not execute 'lsof'. Please make sure it is available in your $PATH.", lines, panel, IncSet_filter(inc));
+      InfoScreen_addLine(this, "Could not execute 'lsof'. Please make sure it is available in your $PATH.");
    } else if (pdata->error == 1) {
-      addLine("Failed listing open files.", lines, panel, IncSet_filter(inc));
+      InfoScreen_addLine(this, "Failed listing open files.");
    } else {
       OpenFiles_FileData* fdata = pdata->files;
       while (fdata) {
@@ -155,7 +141,7 @@ static void OpenFilesScreen_scan(OpenFilesScreen* this, Vector* lines, IncSet* i
             data['s'] ? data['s'] : "",
             data['i'] ? data['i'] : "",
             data['n'] ? data['n'] : "");
-         addLine(entry, lines, panel, IncSet_filter(inc));
+         InfoScreen_addLine(this, entry);
          OpenFiles_Data_clear(&fdata->data);
          OpenFiles_FileData* old = fdata;
          fdata = fdata->next;
@@ -164,82 +150,7 @@ static void OpenFilesScreen_scan(OpenFilesScreen* this, Vector* lines, IncSet* i
       OpenFiles_Data_clear(&pdata->data);
    }
    free(pdata);
-   Vector_insertionSort(lines);
+   Vector_insertionSort(this->lines);
    Vector_insertionSort(panel->items);
    Panel_setSelected(panel, idx);
 }
-
-void OpenFilesScreen_run(OpenFilesScreen* this) {
-   Panel* panel = this->display;
-   Panel_setHeader(panel, "   FD TYPE     DEVICE       SIZE       NODE NAME");
-
-   FunctionBar* bar = panel->defaultBar;
-   IncSet* inc = IncSet_new(bar);
-   
-   Vector* lines = Vector_new(panel->items->type, true, DEFAULT_SIZE);
-
-   OpenFilesScreen_scan(this, lines, inc);
-   OpenFilesScreen_draw(this, inc);
-   
-   bool looping = true;
-   while (looping) {
-   
-      Panel_draw(panel, true);
-      
-      if (inc->active)
-         move(LINES-1, CRT_cursorX);
-      int ch = getch();
-      
-      if (ch == KEY_MOUSE) {
-         MEVENT mevent;
-         int ok = getmouse(&mevent);
-         if (ok == OK)
-            if (mevent.y >= panel->y && mevent.y < LINES - 1) {
-               Panel_setSelected(panel, mevent.y - panel->y + panel->scrollV);
-               ch = 0;
-            } if (mevent.y == LINES - 1)
-               ch = IncSet_synthesizeEvent(inc, mevent.x);
-      }
-
-      if (inc->active) {
-         IncSet_handleKey(inc, ch, panel, IncSet_getListItemValue, lines);
-         continue;
-      }
-
-      switch(ch) {
-      case ERR:
-         continue;
-      case KEY_F(3):
-      case '/':
-         IncSet_activate(inc, INC_SEARCH, panel);
-         break;
-      case KEY_F(4):
-      case '\\':
-         IncSet_activate(inc, INC_FILTER, panel);
-         break;
-      case KEY_F(5):
-         clear();
-         OpenFilesScreen_scan(this, lines, inc);
-         OpenFilesScreen_draw(this, inc);
-         break;
-      case '\014': // Ctrl+L
-         clear();
-         OpenFilesScreen_draw(this, inc);
-         break;
-      case 'q':
-      case 27:
-      case KEY_F(10):
-         looping = false;
-         break;
-      case KEY_RESIZE:
-         Panel_resize(panel, COLS, LINES-2);
-         OpenFilesScreen_draw(this, inc);
-         break;
-      default:
-         Panel_onKey(panel, ch);
-      }
-   }
-
-   Vector_delete(lines);
-   IncSet_delete(inc);
-}
diff --git a/OpenFilesScreen.h b/OpenFilesScreen.h
index 68e33363..8160cfe2 100644
--- a/OpenFilesScreen.h
+++ b/OpenFilesScreen.h
@@ -9,8 +9,7 @@ Released under the GNU GPL, see the COPYING file
 in the source distribution for its full text.
 */
 
-#include "Process.h"
-#include "Panel.h"
+#include "InfoScreen.h"
 
 typedef struct OpenFiles_Data_ {
    char* data[256];
@@ -28,16 +27,19 @@ typedef struct OpenFiles_FileData_ {
 } OpenFiles_FileData;
 
 typedef struct OpenFilesScreen_ {
-   Process* process;
+   InfoScreen super;
    pid_t pid;
-   Panel* display;
 } OpenFilesScreen;
 
 
+extern InfoScreenClass OpenFilesScreen_class;
+
 OpenFilesScreen* OpenFilesScreen_new(Process* process);
 
-void OpenFilesScreen_delete(OpenFilesScreen* this);
+void OpenFilesScreen_delete(Object* this);
+
+void OpenFilesScreen_draw(InfoScreen* this);
 
-void OpenFilesScreen_run(OpenFilesScreen* this);
+void OpenFilesScreen_scan(InfoScreen* this);
 
 #endif
diff --git a/TraceScreen.c b/TraceScreen.c
index 3a62eb63..0752a13c 100644
--- a/TraceScreen.c
+++ b/TraceScreen.c
@@ -8,6 +8,7 @@ in the source distribution for its full text.
 #include "TraceScreen.h"
 
 #include "CRT.h"
+#include "InfoScreen.h"
 #include "ProcessList.h"
 #include "ListItem.h"
 #include "IncSet.h"
@@ -26,13 +27,17 @@ in the source distribution for its full text.
 #include <signal.h>
 
 /*{
-#include "Process.h"
-#include "Panel.h"
+#include "InfoScreen.h"
 
 typedef struct TraceScreen_ {
-   Process* process;
-   Panel* display;
+   InfoScreen super;
    bool tracing;
+   int fdpair[2];
+   int child;
+   FILE* strace;
+   int fd_strace;
+   bool contLine;
+   bool follow;
 } TraceScreen;
 
 }*/
@@ -43,188 +48,125 @@ static const char* TraceScreenKeys[] = {"F3", "F4", "F8", "F9", "Esc"};
 
 static int TraceScreenEvents[] = {KEY_F(3), KEY_F(4), KEY_F(8), KEY_F(9), 27};
 
+InfoScreenClass TraceScreen_class = {
+   .super = {
+      .extends = Class(Object),
+      .delete = TraceScreen_delete
+   },
+   .draw = TraceScreen_draw,
+   .onErr = TraceScreen_updateTrace,
+   .onKey = TraceScreen_onKey,
+};
+
 TraceScreen* TraceScreen_new(Process* process) {
    TraceScreen* this = malloc(sizeof(TraceScreen));
-   this->process = process;
-   FunctionBar* fuBar = FunctionBar_new(TraceScreenFunctions, TraceScreenKeys, TraceScreenEvents);
-   this->display = Panel_new(0, 1, COLS, LINES-2, false, Class(ListItem), fuBar);
+   Object_setClass(this, Class(TraceScreen));
    this->tracing = true;
-   return this;
+   this->contLine = false;
+   this->follow = false;
+   FunctionBar* fuBar = FunctionBar_new(TraceScreenFunctions, TraceScreenKeys, TraceScreenEvents);
+   CRT_disableDelay();
+   return (TraceScreen*) InfoScreen_init(&this->super, process, fuBar, LINES-2, "");
 }
 
-void TraceScreen_delete(TraceScreen* this) {
-   Panel_delete((Object*)this->display);
-   free(this);
+void TraceScreen_delete(Object* cast) {
+   TraceScreen* this = (TraceScreen*) cast;
+   if (this->child > 0) {
+      kill(this->child, SIGTERM);
+      waitpid(this->child, NULL, 0);
+      fclose(this->strace);
+   }
+   CRT_enableDelay();
+   free(InfoScreen_done((InfoScreen*)cast));
 }
 
-static void TraceScreen_draw(TraceScreen* this, IncSet* inc) {
+void TraceScreen_draw(InfoScreen* this) {
    attrset(CRT_colors[PANEL_HEADER_FOCUS]);
    mvhline(0, 0, ' ', COLS);
    mvprintw(0, 0, "Trace of process %d - %s", this->process->pid, this->process->comm);
    attrset(CRT_colors[DEFAULT_COLOR]);
-   IncSet_drawBar(inc);
-}
-
-static inline void addLine(const char* line, Vector* lines, Panel* panel, const char* incFilter) {
-   Vector_add(lines, (Object*) ListItem_new(line, 0));
-   if (!incFilter || String_contains_i(line, incFilter))
-      Panel_add(panel, (Object*)Vector_get(lines, Vector_size(lines)-1));
+   IncSet_drawBar(this->inc);
 }
 
-static inline void appendLine(const char* line, Vector* lines, Panel* panel, const char* incFilter) {
-   ListItem* last = (ListItem*)Vector_get(lines, Vector_size(lines)-1);
-   ListItem_append(last, line);
-   if (incFilter && Panel_get(panel, Panel_size(panel)-1) != (Object*)last && String_contains_i(line, incFilter))
-      Panel_add(panel, (Object*)last);
-}
-
-void TraceScreen_run(TraceScreen* this) {
+bool TraceScreen_forkTracer(TraceScreen* this) {
    char buffer[1001];
-   int fdpair[2];
-   int err = pipe(fdpair);
-   if (err == -1) return;
-   int child = fork();
-   if (child == -1) return;
-   if (child == 0) {
+   int err = pipe(this->fdpair);
+   if (err == -1) return false;
+   this->child = fork();
+   if (this->child == -1) return false;
+   if (this->child == 0) {
       seteuid(getuid());
-      dup2(fdpair[1], STDERR_FILENO);
-      int ok = fcntl(fdpair[1], F_SETFL, O_NONBLOCK);
+      dup2(this->fdpair[1], STDERR_FILENO);
+      int ok = fcntl(this->fdpair[1], F_SETFL, O_NONBLOCK);
       if (ok != -1) {
-         sprintf(buffer, "%d", this->process->pid);
+         sprintf(buffer, "%d", this->super.process->pid);
          execlp("strace", "strace", "-p", buffer, NULL);
       }
       const char* message = "Could not execute 'strace'. Please make sure it is available in your $PATH.";
-      ssize_t written = write(fdpair[1], message, strlen(message));
+      ssize_t written = write(this->fdpair[1], message, strlen(message));
       (void) written;
       exit(1);
    }
-   fcntl(fdpair[0], F_SETFL, O_NONBLOCK);
-   FILE* strace = fdopen(fdpair[0], "r");
-   Panel* panel = this->display;
-   int fd_strace = fileno(strace);
-   CRT_disableDelay();
-   bool contLine = false;
-   bool follow = false;
-   bool looping = true;
-
-   FunctionBar* bar = panel->defaultBar;
-   IncSet* inc = IncSet_new(bar);
-
-   Vector* lines = Vector_new(panel->items->type, true, DEFAULT_SIZE);
-
-   TraceScreen_draw(this, inc);
-   
-   while (looping) {
-
-      Panel_draw(panel, true);
-      const char* incFilter = IncSet_filter(inc);
-
-      if (inc->active)
-         move(LINES-1, CRT_cursorX);
-      int ch = getch();
-      
-      if (ch == ERR) {
-         fd_set fds;
-         FD_ZERO(&fds);
-//         FD_SET(STDIN_FILENO, &fds);
-         FD_SET(fd_strace, &fds);
-         struct timeval tv;
-         tv.tv_sec = 0; tv.tv_usec = 500;
-         int ready = select(fd_strace+1, &fds, NULL, NULL, &tv);
-         int nread = 0;
-         if (ready > 0 && FD_ISSET(fd_strace, &fds))
-            nread = fread(buffer, 1, 1000, strace);
-         if (nread && this->tracing) {
-            char* line = buffer;
-            buffer[nread] = '\0';
-            for (int i = 0; i < nread; i++) {
-               if (buffer[i] == '\n') {
-                  buffer[i] = '\0';
-                  if (contLine) {
-                     appendLine(line, lines, panel, incFilter);
-                     contLine = false;
-                  } else {
-                     addLine(line, lines, panel, incFilter);
-                  }
-                  line = buffer+i+1;
-               }
-            }
-            if (line < buffer+nread) {
-               addLine(line, lines, panel, incFilter);
-               buffer[nread] = '\0';
-               contLine = true;
+   fcntl(this->fdpair[0], F_SETFL, O_NONBLOCK);
+   this->strace = fdopen(this->fdpair[0], "r");
+   this->fd_strace = fileno(this->strace);
+   return true;
+}
+
+void TraceScreen_updateTrace(InfoScreen* super) {
+   TraceScreen* this = (TraceScreen*) super;
+   char buffer[1001];
+   fd_set fds;
+   FD_ZERO(&fds);
+// FD_SET(STDIN_FILENO, &fds);
+   FD_SET(this->fd_strace, &fds);
+   struct timeval tv;
+   tv.tv_sec = 0; tv.tv_usec = 500;
+   int ready = select(this->fd_strace+1, &fds, NULL, NULL, &tv);
+   int nread = 0;
+   if (ready > 0 && FD_ISSET(this->fd_strace, &fds))
+      nread = fread(buffer, 1, 1000, this->strace);
+   if (nread && this->tracing) {
+      char* line = buffer;
+      buffer[nread] = '\0';
+      for (int i = 0; i < nread; i++) {
+         if (buffer[i] == '\n') {
+            buffer[i] = '\0';
+            if (this->contLine) {
+               InfoScreen_appendLine(&this->super, line);
+               this->contLine = false;
+            } else {
+               InfoScreen_addLine(&this->super, line);
             }
-            if (follow)
-               Panel_setSelected(panel, Panel_size(panel)-1);
+            line = buffer+i+1;
          }
       }
-            
-      if (ch == KEY_MOUSE) {
-         MEVENT mevent;
-         int ok = getmouse(&mevent);
-         if (ok == OK)
-            if (mevent.y >= panel->y && mevent.y < LINES - 1) {
-               Panel_setSelected(panel, mevent.y - panel->y + panel->scrollV);
-               follow = false;
-               ch = 0;
-            } if (mevent.y == LINES - 1)
-               ch = IncSet_synthesizeEvent(inc, mevent.x);
-      }
-      
-      if (inc->active) {
-         IncSet_handleKey(inc, ch, panel, IncSet_getListItemValue, lines);
-         continue;
+      if (line < buffer+nread) {
+         InfoScreen_addLine(&this->super, line);
+         buffer[nread] = '\0';
+         this->contLine = true;
       }
-      
-      switch(ch) {
-      case ERR:
-         continue;
-      case KEY_HOME:
-         Panel_setSelected(panel, 0);
-         break;
-      case KEY_END:
-         Panel_setSelected(panel, Panel_size(panel)-1);
-         break;
-      case KEY_F(3):
-      case '/':
-         IncSet_activate(inc, INC_SEARCH, panel);
-         break;
-      case KEY_F(4):
-      case '\\':
-         IncSet_activate(inc, INC_FILTER, panel);
-         break;
+      if (this->follow)
+         Panel_setSelected(this->super.display, Panel_size(this->super.display)-1);
+   }
+}
+
+bool TraceScreen_onKey(InfoScreen* super, int ch) {
+   TraceScreen* this = (TraceScreen*) super;
+   switch(ch) {
       case 'f':
       case KEY_F(8):
-         follow = !follow;
-         if (follow)
-            Panel_setSelected(panel, Panel_size(panel)-1);
-         break;
+         this->follow = !(this->follow);
+         if (this->follow)
+            Panel_setSelected(super->display, Panel_size(super->display)-1);
+         return true;
       case 't':
       case KEY_F(9):
          this->tracing = !this->tracing;
-         FunctionBar_setLabel(bar, KEY_F(9), this->tracing?"Stop Tracing   ":"Resume Tracing ");
-         TraceScreen_draw(this, inc);
-         break;
-      case 'q':
-      case 27:
-      case KEY_F(10):
-         looping = false;
-         break;
-      case KEY_RESIZE:
-         Panel_resize(panel, COLS, LINES-2);
-         TraceScreen_draw(this, inc);
-         break;
-      default:
-         follow = false;
-         Panel_onKey(panel, ch);
-      }
+         FunctionBar_setLabel(super->display->defaultBar, KEY_F(9), this->tracing?"Stop Tracing   ":"Resume Tracing ");
+         InfoScreen_draw(this);
+         return true;
    }
-   
-   IncSet_delete(inc);
-   Vector_delete(lines);
-   
-   kill(child, SIGTERM);
-   waitpid(child, NULL, 0);
-   fclose(strace);
-   CRT_enableDelay();
+   this->follow = false;
+   return false;
 }
diff --git a/TraceScreen.h b/TraceScreen.h
index bb5ad4cf..8845c51a 100644
--- a/TraceScreen.h
+++ b/TraceScreen.h
@@ -9,20 +9,32 @@ Released under the GNU GPL, see the COPYING file
 in the source distribution for its full text.
 */
 
-#include "Process.h"
-#include "Panel.h"
+#include "InfoScreen.h"
 
 typedef struct TraceScreen_ {
-   Process* process;
-   Panel* display;
+   InfoScreen super;
    bool tracing;
+   int fdpair[2];
+   int child;
+   FILE* strace;
+   int fd_strace;
+   bool contLine;
+   bool follow;
 } TraceScreen;
 
 
+extern InfoScreenClass TraceScreen_class;
+
 TraceScreen* TraceScreen_new(Process* process);
 
-void TraceScreen_delete(TraceScreen* this);
+void TraceScreen_delete(Object* cast);
+
+void TraceScreen_draw(InfoScreen* this);
+
+bool TraceScreen_forkTracer(TraceScreen* this);
+
+void TraceScreen_updateTrace(InfoScreen* super);
 
-void TraceScreen_run(TraceScreen* this);
+bool TraceScreen_onKey(InfoScreen* super, int ch);
 
 #endif