Added experimental io.ConfigDragClickToInputText feature to enable turning DragXXX widgets into text input with a simple mouse click-release (without moving). (#3737)

+ Offset ImGuiTableColumnFlags values.

docs/CHANGELOG.txt

@@ -93,6 +93,8 @@ Other Changes:
 - InputText: Fixed swiching from single to multi-line while preserving same ID.
 - Combo: Fixed using IsItemEdited() after Combo() not matching the return value from Combo(). (#2034)
 - DragFloat, DragInt: very slightly increased mouse drag threshold + expressing it as a factor of default value.
+- DragFloat, DragInt: added experimental io.ConfigDragClickToInputText feature to enable turning DragXXX widgets
+  into text input with a simple mouse click-release (without moving). (#3737)
 - Nav: Fixed IsItemFocused() from returning false when Nav highlight is hidden because mouse has moved.
   It's essentially been always the case but it doesn't make much sense. Instead we will aim at exposing
   feedback and control of keyboard/gamepad navigation highlight and mouse hover disable flag. (#787, #2048)

imgui.h

@@ -1118,18 +1118,18 @@ enum ImGuiTableColumnFlags_
     ImGuiTableColumnFlags_DefaultSort               = 1 << 1,   // Default as a sorting column.
     ImGuiTableColumnFlags_WidthStretch              = 1 << 2,   // Column will stretch. Preferable with horizontal scrolling disabled (default if table sizing policy is _SizingStretchSame or _SizingStretchProp).
     ImGuiTableColumnFlags_WidthFixed                = 1 << 3,   // Column will not stretch. Preferable with horizontal scrolling enabled (default if table sizing policy is _SizingFixedFit and table is resizable).
-    ImGuiTableColumnFlags_NoResize                  = 1 << 5,   // Disable manual resizing.
-    ImGuiTableColumnFlags_NoReorder                 = 1 << 6,   // Disable manual reordering this column, this will also prevent other columns from crossing over this column.
-    ImGuiTableColumnFlags_NoHide                    = 1 << 7,   // Disable ability to hide/disable this column.
-    ImGuiTableColumnFlags_NoClip                    = 1 << 8,   // Disable clipping for this column (all NoClip columns will render in a same draw command).
-    ImGuiTableColumnFlags_NoSort                    = 1 << 9,   // Disable ability to sort on this field (even if ImGuiTableFlags_Sortable is set on the table).
-    ImGuiTableColumnFlags_NoSortAscending           = 1 << 10,  // Disable ability to sort in the ascending direction.
-    ImGuiTableColumnFlags_NoSortDescending          = 1 << 11,  // Disable ability to sort in the descending direction.
-    ImGuiTableColumnFlags_NoHeaderWidth             = 1 << 12,  // Disable header text width contribution to automatic column width.
-    ImGuiTableColumnFlags_PreferSortAscending       = 1 << 13,  // Make the initial sort direction Ascending when first sorting on this column (default).
-    ImGuiTableColumnFlags_PreferSortDescending      = 1 << 14,  // Make the initial sort direction Descending when first sorting on this column.
-    ImGuiTableColumnFlags_IndentEnable              = 1 << 15,  // Use current Indent value when entering cell (default for column 0).
-    ImGuiTableColumnFlags_IndentDisable             = 1 << 16,  // Ignore current Indent value when entering cell (default for columns > 0). Indentation changes _within_ the cell will still be honored.
+    ImGuiTableColumnFlags_NoResize                  = 1 << 4,   // Disable manual resizing.
+    ImGuiTableColumnFlags_NoReorder                 = 1 << 5,   // Disable manual reordering this column, this will also prevent other columns from crossing over this column.
+    ImGuiTableColumnFlags_NoHide                    = 1 << 6,   // Disable ability to hide/disable this column.
+    ImGuiTableColumnFlags_NoClip                    = 1 << 7,   // Disable clipping for this column (all NoClip columns will render in a same draw command).
+    ImGuiTableColumnFlags_NoSort                    = 1 << 8,   // Disable ability to sort on this field (even if ImGuiTableFlags_Sortable is set on the table).
+    ImGuiTableColumnFlags_NoSortAscending           = 1 << 9,   // Disable ability to sort in the ascending direction.
+    ImGuiTableColumnFlags_NoSortDescending          = 1 << 10,  // Disable ability to sort in the descending direction.
+    ImGuiTableColumnFlags_NoHeaderWidth             = 1 << 11,  // Disable header text width contribution to automatic column width.
+    ImGuiTableColumnFlags_PreferSortAscending       = 1 << 12,  // Make the initial sort direction Ascending when first sorting on this column (default).
+    ImGuiTableColumnFlags_PreferSortDescending      = 1 << 13,  // Make the initial sort direction Descending when first sorting on this column.
+    ImGuiTableColumnFlags_IndentEnable              = 1 << 14,  // Use current Indent value when entering cell (default for column 0).
+    ImGuiTableColumnFlags_IndentDisable             = 1 << 15,  // Ignore current Indent value when entering cell (default for columns > 0). Indentation changes _within_ the cell will still be honored.
 
     // Output status flags, read-only via TableGetColumnFlags()
     ImGuiTableColumnFlags_IsEnabled                 = 1 << 20,  // Status: is enabled == not hidden by user/api (referred to as "Hide" in _DefaultHide and _NoHide) flags.
@@ -1749,10 +1749,11 @@ struct ImGuiIO
     // Miscellaneous options
     bool        MouseDrawCursor;                // = false          // Request ImGui to draw a mouse cursor for you (if you are on a platform without a mouse cursor). Cannot be easily renamed to 'io.ConfigXXX' because this is frequently used by backend implementations.
     bool        ConfigMacOSXBehaviors;          // = defined(__APPLE__) // OS X style: Text editing cursor movement using Alt instead of Ctrl, Shortcuts using Cmd/Super instead of Ctrl, Line/Text Start and End using Cmd+Arrows instead of Home/End, Double click selects by word instead of selecting whole text, Multi-selection in lists uses Cmd/Super instead of Ctrl.
-    bool        ConfigInputTextCursorBlink;     // = true           // Set to false to disable blinking cursor, for users who consider it distracting.
+    bool        ConfigInputTextCursorBlink;     // = true           // Enable blinking cursor (optional as some users consider it to be distracting).
+    bool        ConfigDragClickToInputText;     // = false          // [BETA] Enable turning DragXXX widgets into text input with a simple mouse click-release (without moving). Not desirable on devices without a keyboard.
     bool        ConfigWindowsResizeFromEdges;   // = true           // Enable resizing of windows from their edges and from the lower-left corner. This requires (io.BackendFlags & ImGuiBackendFlags_HasMouseCursors) because it needs mouse cursor feedback. (This used to be a per-window ImGuiWindowFlags_ResizeFromAnySide flag)
-    bool        ConfigWindowsMoveFromTitleBarOnly; // = false       // [BETA] Set to true to only allow moving windows when clicked+dragged from the title bar. Windows without a title bar are not affected.
-    float       ConfigMemoryCompactTimer;       // = 60.0f          // [BETA] Free transient windows/tables memory buffers when unused for given amount of time. Set to -1.0f to disable.
+    bool        ConfigWindowsMoveFromTitleBarOnly; // = false       // Enable allowing to move windows only when clicking on their title bar. Does not apply to windows without a title bar.
+    float       ConfigMemoryCompactTimer;       // = 60.0f          // Timer (in seconds) to free transient windows/tables memory buffers when unused. Set to -1.0f to disable.
 
     //------------------------------------------------------------------
     // Platform Functions

imgui_demo.cpp

@@ -421,7 +421,9 @@ void ImGui::ShowDemoWindow(bool* p_open)
             ImGui::CheckboxFlags("io.ConfigFlags: NoMouseCursorChange", &io.ConfigFlags, ImGuiConfigFlags_NoMouseCursorChange);
             ImGui::SameLine(); HelpMarker("Instruct backend to not alter mouse cursor shape and visibility.");
             ImGui::Checkbox("io.ConfigInputTextCursorBlink", &io.ConfigInputTextCursorBlink);
-            ImGui::SameLine(); HelpMarker("Set to false to disable blinking cursor, for users who consider it distracting");
+            ImGui::SameLine(); HelpMarker("Enable blinking cursor (optional as some users consider it to be distracting)");
+            ImGui::Checkbox("io.ConfigDragClickToInputText", &io.ConfigDragClickToInputText);
+            ImGui::SameLine(); HelpMarker("Enable turning DragXXX widgets into text input with a simple mouse click-release (without moving).");
             ImGui::Checkbox("io.ConfigWindowsResizeFromEdges", &io.ConfigWindowsResizeFromEdges);
             ImGui::SameLine(); HelpMarker("Enable resizing of windows from their edges and from the lower-left corner.\nThis requires (io.BackendFlags & ImGuiBackendFlags_HasMouseCursors) because it needs mouse cursor feedback.");
             ImGui::Checkbox("io.ConfigWindowsMoveFromTitleBarOnly", &io.ConfigWindowsMoveFromTitleBarOnly);

imgui_widgets.cpp

@@ -2295,17 +2295,15 @@ bool ImGui::DragScalar(const char* label, ImGuiDataType data_type, void* p_data,
                 FocusableItemUnregister(window);
             }
         }
-#if 0
         // Experimental: simple click (without moving) turns Drag into an InputText
         // FIXME: Currently polling ImGuiConfigFlags_IsTouchScreen, may either poll an hypothetical ImGuiBackendFlags_HasKeyboard and/or an explicit drag settings.
-        if (temp_input_allowed && !temp_input_is_active && !(g.IO.ConfigFlags & ImGuiConfigFlags_IsTouchScreen))
+        if (g.IO.ConfigDragClickToInputText && temp_input_allowed && !temp_input_is_active)
             if (g.ActiveId == id && hovered && g.IO.MouseReleased[0] && !IsMouseDragPastThreshold(0, g.IO.MouseDragThreshold * DRAG_MOUSE_THRESHOLD_FACTOR))
             {
                 g.NavInputId = id;
                 temp_input_is_active = true;
                 FocusableItemUnregister(window);
             }
-#endif
     }
 
     if (temp_input_is_active)