add ppbr export dialog, implement text input focus

src/node_text_input.cpp

@@ -12,10 +12,16 @@ Node* NodeTextInput::clone_instantiate() const
 void NodeTextInput::on_tick(float dt)
 {
     timer += dt;
+    
+    bool focus = root()->current_key_capture.get() == this;
+    if (m_cursor && !focus)
+        m_cursor->m_display = false;
+    m_thinkness = focus;
+
     if (timer > 1.0)
     {
         timer = 0;
-        if (m_cursor)
+        if (focus && m_cursor)
         {
             m_cursor->m_display = !m_cursor->m_display;
             app_redraw();
@@ -67,6 +73,9 @@ kEventResult NodeTextInput::handle_event(Event* e)
         break;
     case kEventType::MouseUpL:
         key_capture();
+        timer = 0;
+        if (m_cursor)
+            m_cursor->m_display = true;
         break;
     case kEventType::KeyDown:
         //switch (ke->m_key)