Add text input focus toggle to input_text test

Expose glfwSetTextInputFocus in the input_text test so IME and text input
focus behavior can be exercised independently.

The UI starts in compatibility mode, then shows explicit Focus In or
Focus Out after the toggle is used.

Author: ashie

tests/input_text.c

@@ -112,6 +112,14 @@ static int fontNum = 0;
 static int currentFontIndex = 0;
 
 static int currentIMEStatus = GLFW_FALSE;
+enum text_input_focus_status
+{
+    TEXT_INPUT_FOCUS_COMPATIBLE,
+    TEXT_INPUT_FOCUS_IN,
+    TEXT_INPUT_FOCUS_OUT
+};
+static enum text_input_focus_status currentTextInputFocusStatus =
+    TEXT_INPUT_FOCUS_COMPATIBLE;
 #define MAX_PREEDIT_LEN 128
 static char preeditBuf[MAX_PREEDIT_LEN] = "";
 
@@ -510,13 +518,27 @@ static int set_font_selecter(GLFWwindow* window, struct nk_context* nk, int heig
 
 static void set_ime_buttons(GLFWwindow* window, struct nk_context* nk, int height)
 {
-    nk_layout_row_dynamic(nk, height, 2);
+    nk_layout_row_dynamic(nk, height, 3);
 
     if (nk_button_label(nk, "Toggle IME status"))
     {
         glfwSetInputMode(window, GLFW_IME, !currentIMEStatus);
     }
 
+    if (nk_button_label(nk, "Toggle text input focus"))
+    {
+        if (currentTextInputFocusStatus == TEXT_INPUT_FOCUS_IN)
+        {
+            glfwSetTextInputFocus(window, GLFW_FALSE);
+            currentTextInputFocusStatus = TEXT_INPUT_FOCUS_OUT;
+        }
+        else
+        {
+            glfwSetTextInputFocus(window, GLFW_TRUE);
+            currentTextInputFocusStatus = TEXT_INPUT_FOCUS_IN;
+        }
+    }
+
     if (nk_button_label(nk, "Reset preedit text"))
     {
         glfwResetPreeditText(window);
@@ -615,8 +637,23 @@ static void set_preedit_cursor_edit(GLFWwindow* window, struct nk_context* nk, i
 
 static void set_ime_stauts_labels(GLFWwindow* window, struct nk_context* nk, int height)
 {
-    nk_layout_row_dynamic(nk, height, 1);
+    const char* textInputFocusStatus = "Text input focus: compatible";
+
+    switch (currentTextInputFocusStatus)
+    {
+        case TEXT_INPUT_FOCUS_IN:
+            textInputFocusStatus = "Text input focus: Focus In";
+            break;
+        case TEXT_INPUT_FOCUS_OUT:
+            textInputFocusStatus = "Text input focus: Focus Out";
+            break;
+        case TEXT_INPUT_FOCUS_COMPATIBLE:
+            break;
+    }
+
+    nk_layout_row_dynamic(nk, height, 2);
     nk_value_bool(nk, "IME status", currentIMEStatus);
+    nk_label(nk, textInputFocusStatus, NK_TEXT_LEFT);
 }
 
 static void set_preedit_labels(GLFWwindow* window, struct nk_context* nk, int height)