Debug bugs during canvas resize

2 files changed, 16 insertions, 0 deletions

diff --git a/src/components/Scrollbar.cpp b/src/components/Scrollbar.cpp
index ac713e9..730d2ec 100644
--- a/src/components/Scrollbar.cpp
+++ b/src/components/Scrollbar.cpp
@@ -16,6 +16,8 @@ Scrollbar::Scrollbar(Status *s, bool IsHorizontal) : Component(s) {
 
   DragX = 0;
   DragY = 0;
+  CanvasWidth = 0;
+  CanvasHeight = 0;
   Trigger = false;
 }
 
@@ -35,6 +37,15 @@ void Scrollbar::Refresh() {
   bar.width = bg.width;
   bar.height = bg.height;
 
+  // Check if resize, in this case, reset everything (avoid bugs).
+  // Not that this will be executed during first draw also but it is fine:
+  if((CanvasWidth != status->CanvasWidth) || (CanvasWidth != status->CanvasWidth)){
+    status->ScrollX=0;
+    status->ScrollY=0;
+    bar.x=bg.x;
+    bar.y=bg.y;
+  }
+
   // Compute move table canvas
   double MTCanvasHeight = status->CanvasHeight - status->ScrollbarWidth;
   double MTCanvasWidth = status->CanvasWidth - status->ScrollbarWidth;
@@ -107,6 +118,9 @@ void Scrollbar::Refresh() {
   elements.clear();
   elements.push_back(bg);
   elements.push_back(bar);
+  // Update cache:
+  CanvasWidth = status->CanvasWidth;
+  CanvasHeight = status->CanvasHeight;
 }
 
 void Scrollbar::Focus(double XorY){
diff --git a/src/components/Scrollbar.hpp b/src/components/Scrollbar.hpp
index fa49eca..c313c69 100644
--- a/src/components/Scrollbar.hpp
+++ b/src/components/Scrollbar.hpp
@@ -9,6 +9,8 @@ class Scrollbar : public Component {
   Element bg,bar;
   double DragY,DragX;
   bool Trigger;
+  /// @brief Canvas size cache used to reset on resize
+  double CanvasWidth, CanvasHeight;
 public:
   Scrollbar(Status* s,bool IsHorizontal);
   void Refresh();