InputText() ImGuiInputTextFlags_CallbackAlways event set the EventFlag field of ImGuiTextEditCallbackData (#541)

imgui.cpp

@@ -437,6 +437,7 @@
  - main: IsItemHovered() make it more consistent for various type of widgets, widgets with multiple components, etc. also effectively IsHovered() region sometimes differs from hot region, e.g tree nodes
  - main: IsItemHovered() info stored in a stack? so that 'if TreeNode() { Text; TreePop; } if IsHovered' return the hover state of the TreeNode?
  - input text: add ImGuiInputTextFlags_EnterToApply? (off #218)
+ - input text: reorganise event handling, allow CharFilter to modify buffers, allow multiple events? (#541)
  - input text multi-line: don't directly call AddText() which does an unnecessary vertex reserve for character count prior to clipping. and/or more line-based clipping to AddText(). and/or reorganize TextUnformatted/RenderText for more efficiency for large text (e.g TextUnformatted could clip and log separately, etc).
  - input text multi-line: way to dynamically grow the buffer without forcing the user to initially allocate for worse case (follow up on #200)
  - input text multi-line: line numbers? status bar? (follow up on #200)
@@ -7547,8 +7548,10 @@ bool ImGui::InputTextEx(const char* label, char* buf, int buf_size, const ImVec2
                     event_flag = ImGuiInputTextFlags_CallbackHistory;
                     event_key = ImGuiKey_DownArrow;
                 }
+                else if (flags & ImGuiInputTextFlags_CallbackAlways)
+                    event_flag = ImGuiInputTextFlags_CallbackAlways;
 
-                if (event_key != ImGuiKey_COUNT || (flags & ImGuiInputTextFlags_CallbackAlways) != 0)
+                if (event_flag)
                 {
                     ImGuiTextEditCallbackData callback_data;
                     memset(&callback_data, 0, sizeof(ImGuiTextEditCallbackData));

imgui.h

@@ -488,7 +488,7 @@ enum ImGuiInputTextFlags_
     ImGuiInputTextFlags_EnterReturnsTrue    = 1 << 5,   // Return 'true' when Enter is pressed (as opposed to when the value was modified)
     ImGuiInputTextFlags_CallbackCompletion  = 1 << 6,   // Call user function on pressing TAB (for completion handling)
     ImGuiInputTextFlags_CallbackHistory     = 1 << 7,   // Call user function on pressing Up/Down arrows (for history handling)
-    ImGuiInputTextFlags_CallbackAlways      = 1 << 8,   // Call user function every time
+    ImGuiInputTextFlags_CallbackAlways      = 1 << 8,   // Call user function every time. User code may query cursor position, modify text buffer.
     ImGuiInputTextFlags_CallbackCharFilter  = 1 << 9,   // Call user function to filter character. Modify data->EventChar to replace/filter input, or return 1 to discard character.
     ImGuiInputTextFlags_AllowTabInput       = 1 << 10,  // Pressing TAB input a '\t' character into the text field
     ImGuiInputTextFlags_CtrlEnterForNewLine = 1 << 11,  // In multi-line mode, allow exiting edition by pressing Enter. Ctrl+Enter to add new line (by default adds new lines with Enter).