[PATCHv2 1/2] Initial TUI mouse support

[Hannes Domani via Gdb-patches <gdb-patches@sourceware.org>]

Implements an overridable tui_win_info::click method whose arguments
are the mouse coordinates inside the specific window, and the mouse
button clicked.

And if the curses implementation supports 5 buttons, the 4th and 5th
buttons are used for scrolling.

2021-05-29  Hannes Domani  <ssbssa@yahoo.de>

	* ser-mingw.c (console_select_thread): Handle MOUSE_EVENT.
	* tui/tui-data.h (struct tui_win_info): Add click function.
	* tui/tui-io.c (tui_prep_terminal): Enable mouse events.
	(tui_deprep_terminal): Disable mouse events.
	(tui_dispatch_ctrl_char): Handle KEY_MOUSE.
	* tui/tui.c (tui_disable): Disable mouse events.
---
Should there be a configure option for this at build time?
I don't know if the mousemask/getmouse functions are available for
all curses variants, so I would imagine an option --enable-mouse:
- yes -> error if getmouse can't be linked
- no -> just disable
- auto -> enable if getmouse can be linked

v2:
- Added ChangeLog.
---
 gdb/ser-mingw.c    |  5 +++++
 gdb/tui/tui-data.h |  5 +++++
 gdb/tui/tui-io.c   | 32 ++++++++++++++++++++++++++++++++
 gdb/tui/tui.c      |  2 ++
 4 files changed, 44 insertions(+)

diff --git a/gdb/ser-mingw.c b/gdb/ser-mingw.c
index 043bb50b577..2bad51310f6 100644
--- a/gdb/ser-mingw.c
+++ b/gdb/ser-mingw.c
@@ -599,6 +599,11 @@ console_select_thread (void *arg)
 		  break;
 		}
 	    }
+	  else if (record.EventType == MOUSE_EVENT)
+	    {
+	      SetEvent (state->read_event);
+	      break;
+	    }
 
 	  /* Otherwise discard it and wait again.  */
 	  ReadConsoleInput (h, &record, 1, &n_records);
diff --git a/gdb/tui/tui-data.h b/gdb/tui/tui-data.h
index b4d788dd0a4..74a8b78395b 100644
--- a/gdb/tui/tui-data.h
+++ b/gdb/tui/tui-data.h
@@ -137,6 +137,11 @@ struct tui_win_info
     return true;
   }
 
+  /* Called for each mouse click inside this window.  */
+  virtual void click (int mouse_x, int mouse_y, int mouse_button)
+  {
+  }
+
   void check_and_display_highlight_if_needed ();
 
   /* Window handle.  */
diff --git a/gdb/tui/tui-io.c b/gdb/tui/tui-io.c
index a2be4d4353e..7787789f0c7 100644
--- a/gdb/tui/tui-io.c
+++ b/gdb/tui/tui-io.c
@@ -33,6 +33,7 @@
 #include "tui/tui-wingeneral.h"
 #include "tui/tui-file.h"
 #include "tui/tui-out.h"
+#include "tui/tui-source.h"
 #include "ui-out.h"
 #include "cli-out.h"
 #include <fcntl.h>
@@ -639,6 +640,7 @@ tui_redisplay_readline (void)
 static void
 tui_prep_terminal (int notused1)
 {
+  mousemask (ALL_MOUSE_EVENTS, NULL);
 }
 
 /* Readline callback to restore the terminal.  It is called once each
@@ -646,6 +648,7 @@ tui_prep_terminal (int notused1)
 static void
 tui_deprep_terminal (void)
 {
+  mousemask (0, NULL);
 }
 
 #ifdef TUI_USE_PIPE_FOR_READLINE
@@ -978,6 +981,35 @@ tui_dispatch_ctrl_char (unsigned int ch)
     case KEY_LEFT:
       win_info->right_scroll (1);
       break;
+    case KEY_MOUSE:
+	{
+	  MEVENT mev;
+	  if (getmouse (&mev) != OK)
+	    break;
+
+	  for (tui_win_info *wi : all_tui_windows ())
+	    if (mev.x > wi->x && mev.x < wi->x + wi->width - 1
+		&& mev.y > wi->y && mev.y < wi->y + wi->height - 1)
+	      {
+		if ((mev.bstate & BUTTON1_CLICKED)
+		    || (mev.bstate & BUTTON2_CLICKED)
+		    || (mev.bstate & BUTTON3_CLICKED))
+		  {
+		    int button = (mev.bstate & BUTTON1_CLICKED) ? 1
+		      : (mev.bstate & BUTTON2_CLICKED) ? 2
+		      : 3;
+		    wi->click (mev.x - wi->x - 1, mev.y - wi->y - 1, button);
+		  }
+#ifdef BUTTON5_PRESSED
+		else if (mev.bstate & BUTTON4_PRESSED)
+		  wi->backward_scroll (3);
+		else if (mev.bstate & BUTTON5_PRESSED)
+		  wi->forward_scroll (3);
+#endif
+		break;
+	      }
+	}
+      break;
     case '\f':
       break;
     default:
diff --git a/gdb/tui/tui.c b/gdb/tui/tui.c
index af92b2a8042..a2654a2e5a4 100644
--- a/gdb/tui/tui.c
+++ b/gdb/tui/tui.c
@@ -508,6 +508,8 @@ tui_disable (void)
   rl_startup_hook = 0;
   rl_already_prompted = 0;
 
+  mousemask (0, NULL);
+
   /* Leave curses and restore previous gdb terminal setting.  */
   endwin ();
 
-- 
2.31.1