From 1f4c881c400ae72a4777bad680f8d517e5c8a66e Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sat, 25 Apr 2026 02:43:59 +0200
Subject: [PATCH] touch_sensitivity option

---
 commandline.cpp |  2 +-
 config.cpp      |  4 ++++
 control.cpp     | 18 ++++++++++++++----
 hypgraph.cpp    |  3 +++
 4 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/commandline.cpp b/commandline.cpp
index 234eb9f6..879a30f1 100644
--- a/commandline.cpp
+++ b/commandline.cpp
@@ -326,7 +326,7 @@ int arg::readCommon() {
     no_find_player = true;
     game_keys_scroll = true;
     smooth_scrolling = true;
-    touchmode = tmode::drag;
+    touchmode = tmode::info;
     }
 
   else if(argis("-vizhr")) {
diff --git a/config.cpp b/config.cpp
index 76326ac5..7533ff59 100644
--- a/config.cpp
+++ b/config.cpp
@@ -1578,6 +1578,8 @@ EX void initConfig() {
   vid.killreduction = 0;
   
   param_b(vid.skipstart, "skip the start menu", false);
+  param_f(drag_sensitivity, "drag_sensitivity", 0)
+  ->editable(0, 100, 1, "drag threshold", "Drag automatically on touch movement. Only if quick mouse is off. Set to 0 to disable, large numbers are more sensitive.", 'T');
   param_b(vid.quickmouse, "quick mouse", qm)
   -> help("Buttons activate when they are pressed (by clicking), not when they are released.");
   
@@ -4295,6 +4297,8 @@ EX void configureMouse() {
   dialog::addBoolItem_action(XLAT("quick mouse"), vid.quickmouse, 'M');
   #endif
 
+  add_edit(drag_sensitivity);
+
   dialog::addSelItem(XLAT("move by clicking on compass"), its(vid.mobilecompasssize), 'C');
   dialog::add_action([] {
     dialog::editNumber(vid.mobilecompasssize, 0, 100, 10, 20, XLAT("compass size"), XLAT("0 to disable"));
diff --git a/control.cpp b/control.cpp
index 2312a65f..6de66fc7 100644
--- a/control.cpp
+++ b/control.cpp
@@ -22,6 +22,7 @@ EX bool targetclick, hiliteclick, forcetarget, numlock_on;
 EX bool gtouched;
 
 EX bool holdmouse;
+EX int mouse_state; // 0 = default, 1 = press, 3 = hold, 2 = release
 
 EX int getcstat, lgetcstat;
 EX ld getcshift;
@@ -199,6 +200,7 @@ enum class tmode { move, info, drag, fire, ranged };
 #endif
 
 EX bool touch_interface;
+EX ld drag_sensitivity, drag_distance;
 EX tmode touchmode;
 EX vector<string> touch_description = { "touch to move", "touch for info", "touch to drag", "touch to aim", "touch for ranged" };
 
@@ -811,18 +813,21 @@ EX void handleKeyNormal(int sym, int uni) {
       invalid = touchmode == tmode::fire && !bow::crossbow_mode();
       if(!mapeditor::drawplayer && touchmode == tmode::ranged) invalid=true;
       if(game_keys_scroll && touchmode == tmode::move) invalid=true;
+      if(drag_sensitivity && touchmode == tmode::drag) invalid=true;
       }
     while(invalid);
     }
 
   if(sym == '-' || sym == PSEUDOKEY_WHEELDOWN) {
     actonrelease = false;
-
     
     multi::cpid = 0;
-    if(touchmode == tmode::drag) {
+    bool adr = drag_sensitivity && !vid.quickmouse && mouse_state != 2;
+    if(touchmode == tmode::drag || adr) {
       if(holdmouse) panning(mouseoh, mouseh);
+      if(!holdmouse) drag_distance = 0;
       holdmouse = true;
+      if(adr && drag_distance < 1/drag_sensitivity) actonrelease = true;
       }
     else if(touchmode == tmode::info)
       gotoHelp(help);
@@ -1296,6 +1301,7 @@ EX void handle_event(SDL_Event& ev) {
     int sym = 0;
     int uni = 0;
     shiftmul = 1;
+    mouse_state = 0;
     
 /*    if(ev.type == SDL_JOYDEVICEADDED || ev.type == SDL_JOYDEVICEREMOVED) {
       joyx = joyy = 0;
@@ -1487,8 +1493,12 @@ EX void handle_event(SDL_Event& ev) {
       bool up = ev.type == SDL_EVENT_MOUSE_BUTTON_UP;
       
       bool act = false;
+      mouse_state = down ? 1 : up ? 2 : 0;
+
+      bool startdrag = getcstat == '-' &&
+        (touchmode == tmode::drag || (!vid.quickmouse && drag_sensitivity && !was_holdmouse));
       
-      if(vid.quickmouse || getcstat == PSEUDOKEY_LIST_SLIDER || (getcstat == '-' && touchmode == tmode::drag)) {
+      if(vid.quickmouse || getcstat == PSEUDOKEY_LIST_SLIDER || startdrag) {
         act = down;
         }
       else {
@@ -1570,7 +1580,7 @@ EX void handle_event(SDL_Event& ev) {
       
       need_mouseh = true;
 
-      if(holdmouse && getcstat == '-') sym = uni = getcstat, fix_mouseh();
+      if(holdmouse && getcstat == '-') sym = uni = getcstat, fix_mouseh(), mouse_state = 3;
 
       if(((SDL_GetMouseState(NULL, NULL) & SDL_BUTTON_MMASK)) && !mouseout2()) {
         fix_mouseh();
diff --git a/hypgraph.cpp b/hypgraph.cpp
index 8299316f..a2bf8f0a 100644
--- a/hypgraph.cpp
+++ b/hypgraph.cpp
@@ -2505,9 +2505,12 @@ EX void resetview() {
 EX void panning(shiftpoint hf0, shiftpoint ht0) {
   hyperpoint hf = hf0.h;
   hyperpoint ht = unshift(ht0, hf0.shift);
+  ld d = hdist(hf, ht);
+  if(drag_sensitivity && d < 1/drag_sensitivity && drag_distance == 0) return;
   View = 
     rgpushxto0(hf) * rgpushxto0(gpushxto0(hf) * ht) * gpushxto0(hf) * View;
   playermoved = false; currently_scrolling = true;
+  drag_distance += d;
   }
 
 EX int cells_drawn, cells_generated;