PixelPaint: Have layers and images send out notifications on changes

We use this to automatically update the thumbnail in LayerListWidget
when you draw into a layer. We also use it to repaint the ImageEditor
when the image changes somehow. :^)

1 files changed, 4 insertions, 0 deletions

diff --git a/Applications/PixelPaint/Layer.h b/Applications/PixelPaint/Layer.h
index 5eb8ed2d12..cc192cbe3f 100644
--- a/Applications/PixelPaint/Layer.h
+++ b/Applications/PixelPaint/Layer.h
@@ -33,6 +33,8 @@
 
 namespace PixelPaint {
 
+class Image;
+
 class Layer : public RefCounted<Layer> {
     AK_MAKE_NONCOPYABLE(Layer);
     AK_MAKE_NONMOVABLE(Layer);
@@ -55,6 +57,8 @@ public:
     const String& name() const { return m_name; }
     void set_name(const String& name) { m_name = name; }
 
+    void did_modify_bitmap(Image&);
+
 private:
     explicit Layer(const Gfx::Size&, const String& name);