[Bundle] make InputTextMultiline with imgui-node-editor (cf thedmd/im…

…gui-node-editor#242 (comment))

imgui_widgets.cpp

@@ -3817,9 +3817,66 @@ bool ImGui::InputText(const char* label, char* buf, size_t buf_size, ImGuiInputT
     return InputTextEx(label, NULL, buf, (int)buf_size, ImVec2(0, 0), flags, callback, user_data);
 }
 
+// [ADAPT_IMGUI_BUNDLE] cf
+bool Priv_ImGuiNodeEditor_IsInCanvas();
+// [/ADAPT_IMGUI_BUNDLE]
+
+
 bool ImGui::InputTextMultiline(const char* label, char* buf, size_t buf_size, const ImVec2& size, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
 {
-    return InputTextEx(label, NULL, buf, (int)buf_size, size, flags | ImGuiInputTextFlags_Multiline, callback, user_data);
+    // [ADAPT_IMGUI_BUNDLE] cf
+    // When inside imgui-node-editor canvas, we cannot open child windows
+    // In this case, we present a one line version of the input text,
+    // and offer the possibility to open a popup to edit the text in a multiline widget
+    if (Priv_ImGuiNodeEditor_IsInCanvas())
+    {
+        PushID(label); // make sure to use unique ids
+        bool changed = false;
+
+        // A- One line version text, without the label
+        if (size.x > 0.f)
+            SetNextItemWidth(size.x);
+        if (InputText("##hidden_label", buf, buf_size, flags, callback, user_data))
+            changed = true;
+        float input_text_actual_width = GetItemRectSize().x;  // we will reuse this width for the widget in the popup
+        SameLine();
+
+        // B- Add a button to open a popup to edit the text
+        //   i. First, move the cursor to the left, so that the button appears right next to the input text
+        ImVec2 pos = ImGui::GetCursorScreenPos();
+        pos.x -= (ImGui::GetStyle().ItemSpacing.x);
+        ImGui::SetCursorScreenPos(pos);
+        //   ii. Then add the button
+        if (SmallButton("..."))
+            OpenPopup("InputTextMultilinePopup");
+
+        // C. Finally, add the label (up until "##")
+        const char* label_end = FindRenderedTextEnd(label);
+        SameLine();
+        TextUnformatted(label, label_end);
+
+        // D. Handle the popup
+        if (ImGui::BeginPopup("InputTextMultilinePopup"))
+        {
+            // Note: there is no infinite recursion here, since we are not inside the canvas anymore
+            // (as soon as BeginPopup return true, we are outside the canvas)
+            // (iif the patches https://github.com/thedmd/imgui-node-editor/issues/242#issuecomment-1681806764
+            //  and https://github.com/thedmd/imgui-node-editor/issues/242#issuecomment-2404714757 are applied)
+            ImVec2 size_multiline = size;
+            size_multiline.x = input_text_actual_width;
+            if (InputTextMultiline("##edit", buf, buf_size, size_multiline, flags, callback, user_data))
+                changed = true;
+            EndPopup();
+        }
+        PopID();
+        return changed;
+    }
+    // [/ADAPT_IMGUI_BUNDLE]
+    else
+    {
+        // Standard behavior outside of imgui-node-editor canvas
+        return InputTextEx(label, NULL, buf, (int)buf_size, size, flags | ImGuiInputTextFlags_Multiline, callback, user_data);
+    }
 }
 
 bool ImGui::InputTextWithHint(const char* label, const char* hint, char* buf, size_t buf_size, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)