[lua] Add Dialog:repaint() function

src/app/script/canvas_widget.cpp

@@ -32,6 +32,20 @@ Canvas::Canvas() : ui::Widget(Type())
 {
 }
 
+void Canvas::callPaint()
+{
+  if (!m_surface)
+    return;
+
+  os::Paint p;
+  p.color(bgColor());
+  m_surface->drawRect(m_surface->bounds(), p);
+
+  // Draw only on resize (onPaint we draw the cached m_surface)
+  GraphicsContext gc(m_surface);
+  Paint(gc);
+}
+
 void Canvas::onInitTheme(ui::InitThemeEvent& ev)
 {
   Widget::onInitTheme(ev);
@@ -56,13 +70,7 @@ void Canvas::onResize(ui::ResizeEvent& ev)
         m_surface->height() != h) {
       m_surface = os::instance()->makeSurface(w, h);
 
-      os::Paint p;
-      p.color(bgColor());
-      m_surface->drawRect(m_surface->bounds(), p);
-
-      // Draw only on resize (onPaint we draw the cached m_surface)
-      GraphicsContext gc(m_surface);
-      Paint(gc);
+      callPaint();
     }
   }
   else

src/app/script/canvas_widget.h

@@ -24,6 +24,8 @@ public:
 
   Canvas();
 
+  void callPaint();
+
   obs::signal<void(GraphicsContext&)> Paint;
 
 private:

src/app/script/dialog_class.cpp

@@ -37,6 +37,7 @@
 #include "ui/window.h"
 
 #include <map>
+#include <stack>
 #include <string>
 #include <vector>
 
@@ -1115,6 +1116,27 @@ int Dialog_modify(lua_State* L)
   return 1;
 }
 
+int Dialog_repaint(lua_State* L)
+{
+  auto dlg = get_obj<Dialog>(L, 1);
+  std::stack<ui::Widget*> widgets;
+  widgets.push(&dlg->grid);
+
+  while (!widgets.empty()) {
+    auto child = widgets.top();
+    widgets.pop();
+
+    if (child->type() == Canvas::Type()) {
+      static_cast<Canvas*>(child)->callPaint();
+      child->invalidate();
+    }
+
+    for (auto subchild : child->children())
+      widgets.push(subchild);
+  }
+  return 0;
+}
+
 int Dialog_get_data(lua_State* L)
 {
   auto dlg = get_obj<Dialog>(L, 1);
@@ -1333,6 +1355,7 @@ const luaL_Reg Dialog_methods[] = {
   { "file", Dialog_file },
   { "canvas", Dialog_canvas },
   { "modify", Dialog_modify },
+  { "repaint", Dialog_repaint },
   { nullptr, nullptr }
 };