IO: Added io.ClearEventsQueue(). Obsoleted io.ClearInputCharacters(). (#4921)

cc #2425 #1153 #1600

docs/CHANGELOG.txt

@@ -36,8 +36,19 @@ HOW TO UPDATE?
 
 Breaking changes:
 
+- IO: Obsoleted io.ClearInputCharacters() (added in 1.47) as it now ambiguous
+  and often incorrect/misleading considering the existence of a higher-level
+  input queue. (#4921)
+
 Other changes:
 
+- IO: Added io.ClearEventsQueue() to clear incoming inputs events. (#4921)
+  May be useful in conjunction with io.ClearInputsKeys() if you need to clear
+  both current inputs state and queued events (e.g. when using blocking native
+  dialogs such as Windows's ::MessageBox() or ::GetOpenFileName()).
+- IO: Changed io.ClearInputsKeys() specs to also clear current frame character buffer
+  (what now obsoleted io.ClearInputCharacters() did), as this is effectively the
+  desirable behavior.
 - Demo: Better showcase use of SetNextItemAllowOverlap(). (#6574, #6512, #3909, #517)
 
 

imgui.cpp

@@ -1341,13 +1341,15 @@ void ImGuiIO::AddInputCharactersUTF8(const char* utf8_chars)
     }
 }
 
-// FIXME: Perhaps we could clear queued events as well?
-void ImGuiIO::ClearInputCharacters()
+// Clear all incoming events.
+void ImGuiIO::ClearEventsQueue()
 {
-    InputQueueCharacters.resize(0);
+    IM_ASSERT(Ctx != NULL);
+    ImGuiContext& g = *Ctx;
+    g.InputEventsQueue.clear();
 }
 
-// FIXME: Perhaps we could clear queued events as well?
+// Clear current keyboard/mouse/gamepad state + current frame text input buffer. Equivalent to releasing all keys/buttons.
 void ImGuiIO::ClearInputKeys()
 {
 #ifndef IMGUI_DISABLE_OBSOLETE_KEYIO
@@ -1368,8 +1370,18 @@ void ImGuiIO::ClearInputKeys()
         MouseDownDuration[n] = MouseDownDurationPrev[n] = -1.0f;
     }
     MouseWheel = MouseWheelH = 0.0f;
+    InputQueueCharacters.resize(0); // Behavior of old ClearInputCharacters().
 }
 
+// Removed this as it is ambiguous/misleading and generally incorrect to use with the existence of a higher-level input queue.
+// Current frame character buffer is now also cleared by ClearInputKeys().
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+void ImGuiIO::ClearInputCharacters()
+{
+    InputQueueCharacters.resize(0);
+}
+#endif
+
 static ImGuiInputEvent* FindLatestInputEvent(ImGuiContext* ctx, ImGuiInputEventType type, int arg = -1)
 {
     ImGuiContext& g = *ctx;

imgui.h

@@ -25,7 +25,7 @@
 // Library Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM >= 12345')
 #define IMGUI_VERSION       "1.89.8 WIP"
-#define IMGUI_VERSION_NUM   18971
+#define IMGUI_VERSION_NUM   18972
 #define IMGUI_HAS_TABLE
 
 /*
@@ -2058,8 +2058,11 @@ struct ImGuiIO
 
     IMGUI_API void  SetKeyEventNativeData(ImGuiKey key, int native_keycode, int native_scancode, int native_legacy_index = -1); // [Optional] Specify index for legacy <1.87 IsKeyXXX() functions with native indices + specify native keycode, scancode.
     IMGUI_API void  SetAppAcceptingEvents(bool accepting_events);           // Set master flag for accepting key/mouse/text events (default to true). Useful if you have native dialog boxes that are interrupting your application loop/refresh, and you want to disable events being queued while your app is frozen.
-    IMGUI_API void  ClearInputCharacters();                                 // [Internal] Clear the text input buffer manually
-    IMGUI_API void  ClearInputKeys();                                       // [Internal] Release all keys
+    IMGUI_API void  ClearEventsQueue();                                     // Clear all incoming events.
+    IMGUI_API void  ClearInputKeys();                                       // Clear current keyboard/mouse/gamepad state + current frame text input buffer. Equivalent to releasing all keys/buttons.
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+    IMGUI_API void  ClearInputCharacters();                                 // [Obsolete] Clear the current frame text input buffer. Now included within ClearInputKeys().
+#endif
 
     //------------------------------------------------------------------
     // Output - Updated by NewFrame() or EndFrame()/Render()