InputText: made double-click select word, triple-line select line. Word delimitation logic differs slightly from the one used by CTRL+arrows. (#2244)

docs/CHANGELOG.txt

@@ -39,6 +39,8 @@ Breaking Changes:
 Other Changes:
 
 - Added IsMouseTripleClicked() function. Tracking multi-click count in IO structure. (#3229) [@kudaba]
+- InputText: made double-click select word, triple-line select line. Word delimitation logic differs
+  slightly from the one used by CTRL+arrows. (#2244)
 - Backends: Vulkan: Call vkCmdSetScissor() at the end of render with a full-viewport to reduce
   likehood of issues with people using VK_DYNAMIC_STATE_SCISSOR in their app without calling
   vkCmdSetScissor() explicitly every frame. (#4644)

imgui_widgets.cpp

@@ -3679,17 +3679,18 @@ static void    STB_TEXTEDIT_LAYOUTROW(StbTexteditRow* r, ImGuiInputTextState* ob
 }
 
 // When ImGuiInputTextFlags_Password is set, we don't want actions such as CTRL+Arrow to leak the fact that underlying data are blanks or separators.
-static bool is_separator(unsigned int c)                                        { return ImCharIsBlankW(c) || c==',' || c==';' || c=='(' || c==')' || c=='{' || c=='}' || c=='[' || c==']' || c=='|'; }
+static bool is_separator(unsigned int c)                                        { return ImCharIsBlankW(c) || c==',' || c==';' || c=='(' || c==')' || c=='{' || c=='}' || c=='[' || c==']' || c=='|' || c=='\n' || c=='\r'; }
 static int  is_word_boundary_from_right(ImGuiInputTextState* obj, int idx)      { if (obj->Flags & ImGuiInputTextFlags_Password) return 0; return idx > 0 ? (is_separator(obj->TextW[idx - 1]) && !is_separator(obj->TextW[idx]) ) : 1; }
+static int  is_word_boundary_from_left(ImGuiInputTextState* obj, int idx)       { if (obj->Flags & ImGuiInputTextFlags_Password) return 0; return idx > 0 ? (!is_separator(obj->TextW[idx - 1]) && is_separator(obj->TextW[idx])) : 1; }
 static int  STB_TEXTEDIT_MOVEWORDLEFT_IMPL(ImGuiInputTextState* obj, int idx)   { idx--; while (idx >= 0 && !is_word_boundary_from_right(obj, idx)) idx--; return idx < 0 ? 0 : idx; }
-#ifdef __APPLE__    // FIXME: Move setting to IO structure
+static int  STB_TEXTEDIT_MOVEWORDRIGHT_MAC(ImGuiInputTextState* obj, int idx)   { idx++; int len = obj->CurLenW; while (idx < len && !is_word_boundary_from_left(obj, idx)) idx++; return idx > len ? len : idx; }
-static int  is_word_boundary_from_left(ImGuiInputTextState* obj, int idx)       { if (obj->Flags & ImGuiInputTextFlags_Password) return 0; return idx > 0 ? (!is_separator(obj->TextW[idx - 1]) && is_separator(obj->TextW[idx]) ) : 1; }
+static int  STB_TEXTEDIT_MOVEWORDRIGHT_WIN(ImGuiInputTextState* obj, int idx)   { idx++; int len = obj->CurLenW; while (idx < len && !is_word_boundary_from_right(obj, idx)) idx++; return idx > len ? len : idx; }
-static int  STB_TEXTEDIT_MOVEWORDRIGHT_IMPL(ImGuiInputTextState* obj, int idx)  { idx++; int len = obj->CurLenW; while (idx < len && !is_word_boundary_from_left(obj, idx)) idx++; return idx > len ? len : idx; }
-#else
-static int  STB_TEXTEDIT_MOVEWORDRIGHT_IMPL(ImGuiInputTextState* obj, int idx)  { idx++; int len = obj->CurLenW; while (idx < len && !is_word_boundary_from_right(obj, idx)) idx++; return idx > len ? len : idx; }
-#endif
 #define STB_TEXTEDIT_MOVEWORDLEFT   STB_TEXTEDIT_MOVEWORDLEFT_IMPL    // They need to be #define for stb_textedit.h
-#define STB_TEXTEDIT_MOVEWORDRIGHT  STB_TEXTEDIT_MOVEWORDRIGHT_IMPL
+#ifdef __APPLE__    // FIXME: Move setting to IO structure
+#define STB_TEXTEDIT_MOVEWORDRIGHT  STB_TEXTEDIT_MOVEWORDRIGHT_MAC
+#else
+#define STB_TEXTEDIT_MOVEWORDRIGHT  STB_TEXTEDIT_MOVEWORDRIGHT_WIN
+#endif
 
 static void STB_TEXTEDIT_DELETECHARS(ImGuiInputTextState* obj, int pos, int n)
 {
@@ -3881,11 +3882,12 @@ static bool InputTextFilterCharacter(unsigned int* p_char, ImGuiInputTextFlags f
     // Generic named filters
     if (apply_named_filters && (flags & (ImGuiInputTextFlags_CharsDecimal | ImGuiInputTextFlags_CharsHexadecimal | ImGuiInputTextFlags_CharsUppercase | ImGuiInputTextFlags_CharsNoBlank | ImGuiInputTextFlags_CharsScientific)))
     {
-        // The libc allows overriding locale, with e.g. 'setlocale(LC_NUMERIC, "de_DE.UTF-8");' which affect the output/input of printf/scanf.
+        // The libc allows overriding locale, with e.g. 'setlocale(LC_NUMERIC, "de_DE.UTF-8");' which affect the output/input of printf/scanf to use e.g. ',' instead of '.'.
         // The standard mandate that programs starts in the "C" locale where the decimal point is '.'.
         // We don't really intend to provide widespread support for it, but out of empathy for people stuck with using odd API, we support the bare minimum aka overriding the decimal point.
         // Change the default decimal_point with:
         //   ImGui::GetCurrentContext()->PlatformLocaleDecimalPoint = *localeconv()->decimal_point;
+        // Users of non-default decimal point (in particular ',') may be affected by word-selection logic (is_word_boundary_from_right/is_word_boundary_from_left) functions.
         ImGuiContext& g = *GImGui;
         const unsigned c_decimal_point = (unsigned int)g.PlatformLocaleDecimalPoint;
 
@@ -4176,19 +4178,41 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
         const float mouse_y = (is_multiline ? (io.MousePos.y - draw_window->DC.CursorPos.y) : (g.FontSize * 0.5f));
 
         const bool is_osx = io.ConfigMacOSXBehaviors;
-        if (select_all || (hovered && !is_osx && io.MouseClickedCount[0] == 2))
+        if (select_all)
         {
             state->SelectAll();
             state->SelectedAllMouseLock = true;
         }
-        else if (hovered && is_osx && io.MouseClickedCount[0] == 2)
+        else if (hovered && io.MouseClickedCount[0] >= 2 && !io.KeyShift)
         {
-            // Double-click select a word only, OS X style (by simulating keystrokes)
+            stb_textedit_click(state, &state->Stb, mouse_x, mouse_y);
-            state->OnKeyPressed(STB_TEXTEDIT_K_WORDLEFT);
+            const int multiclick_count = (io.MouseClickedCount[0] - 2);
-            state->OnKeyPressed(STB_TEXTEDIT_K_WORDRIGHT | STB_TEXTEDIT_K_SHIFT);
+            if ((multiclick_count % 2) == 0)
+            {
+                // Double-click: Select word
+                // We always use the "Mac" word advance for double-click select vs CTRL+Right which use the platform dependent variant:
+                // FIXME: There are likely many ways to improve this behavior, but there's no "right" behavior (depends on use-case, software, OS)
+                const bool is_bol = (state->Stb.cursor == 0) || ImStb::STB_TEXTEDIT_GETCHAR(state, state->Stb.cursor - 1) == '\n';
+                if (STB_TEXT_HAS_SELECTION(&state->Stb) || !is_bol)
+                    state->OnKeyPressed(STB_TEXTEDIT_K_WORDLEFT);
+                //state->OnKeyPressed(STB_TEXTEDIT_K_WORDRIGHT | STB_TEXTEDIT_K_SHIFT);
+                if (!STB_TEXT_HAS_SELECTION(&state->Stb))
+                    ImStb::stb_textedit_prep_selection_at_cursor(&state->Stb);
+                state->Stb.cursor = ImStb::STB_TEXTEDIT_MOVEWORDRIGHT_MAC(state, state->Stb.cursor);
+                state->Stb.select_end = state->Stb.cursor;
+                ImStb::stb_textedit_clamp(state, &state->Stb);
+            }
+            else
+            {
+                // Triple-click: Select line
+                state->OnKeyPressed(STB_TEXTEDIT_K_LINESTART);
+                state->OnKeyPressed(STB_TEXTEDIT_K_LINEEND | STB_TEXTEDIT_K_SHIFT);
+            }
+            state->CursorAnimReset();
         }
         else if (io.MouseClicked[0] && !state->SelectedAllMouseLock)
         {
+            // FIXME: unselect on late click could be done release?
             if (hovered)
             {
                 stb_textedit_click(state, &state->Stb, mouse_x, mouse_y);