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fix(shaders_lab): drop zone no longer eats node/slider input + inline tests

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The previous InvisibleButton captured mouse events, so you could drag
from the Functions palette into the canvas, but node dragging and
slider interaction inside the canvas stopped working.

Fix: watch the global drag-drop payload without an explicit target. When
the mouse releases LMB over the DAG window with a "DAG_NODE_TYPE"
payload active, queue an add at that canvas position. No button, no
capture.

Tests (compiled standalone with preprocessor defines):
- dag_compile: 6/6 asserts (empty, single gen, op chain, multi-source
  blend, Output-driven fragColor, unconnected-Output fallback).
- dag_catalog: 8/8 asserts (uniqueness, per-kind input invariants,
  exactly one Output, body_glsl present & returns, control param
  indices valid).
Build with:
  g++ -std=c++17 -Icpp/functions -DDAG_COMPILE_TEST cpp/functions/gfx/dag_compile.cpp cpp/functions/gfx/dag_catalog.cpp -o /tmp/dag_compile_test
  g++ -std=c++17 -Icpp/functions -DDAG_CATALOG_TEST cpp/functions/gfx/dag_catalog.cpp -o /tmp/dag_catalog_test

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Egutierrez
2026-04-24 22:24:39 +02:00
parent e828af3ac1
commit e3cfab3dc7
4 changed files with 169 additions and 13 deletions
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cpp/functions/gfx/dag_node_editor.cpp
+14 -13
View File
@@ -138,25 +138,26 @@ bool dag_node_editor(std::vector<DagStep>& pipeline) {
s_ctx = ed::CreateEditor(&cfg);
}
// Palette drop zone: accept dropped node types (from the Functions panel)
// and queue an add at the mouse canvas position (resolved after ed::Begin).
// Palette drop: detect without a capturing target (an InvisibleButton would
// steal clicks from the node editor). Observe the active drag-drop payload
// and, if the mouse is over this window and the user releases LMB, queue an
// add at that canvas position.
static std::string s_pending_add_name;
static ImVec2 s_pending_add_pos(0, 0);
static bool s_pending_add = false;
ImVec2 origin = ImGui::GetCursorScreenPos();
ImVec2 avail = ImGui::GetContentRegionAvail();
ImGui::InvisibleButton("##dag_drop_zone", avail,
ImGuiButtonFlags_MouseButtonLeft | ImGuiButtonFlags_MouseButtonRight);
if (ImGui::BeginDragDropTarget()) {
if (const ImGuiPayload* p = ImGui::AcceptDragDropPayload("DAG_NODE_TYPE")) {
s_pending_add_name.assign(static_cast<const char*>(p->Data), static_cast<size_t>(p->DataSize));
s_pending_add_pos = ImGui::GetMousePos();
s_pending_add = true;
const bool window_hovered = ImGui::IsWindowHovered(
ImGuiHoveredFlags_ChildWindows | ImGuiHoveredFlags_AllowWhenBlockedByActiveItem);
if (window_hovered) {
if (const ImGuiPayload* p = ImGui::GetDragDropPayload()) {
if (p->IsDataType("DAG_NODE_TYPE") && ImGui::IsMouseReleased(ImGuiMouseButton_Left)) {
s_pending_add_name.assign(static_cast<const char*>(p->Data),
static_cast<size_t>(p->DataSize));
s_pending_add_pos = ImGui::GetMousePos();
s_pending_add = true;
}
}
ImGui::EndDragDropTarget();
}
ImGui::SetCursorScreenPos(origin);
ed::SetCurrentEditor(s_ctx);
ed::Begin("dag_editor", ImVec2(0.0f, 0.0f));