Adding features to the API

src/UIComponent.cpp

@@ -21,6 +21,15 @@ UIElement::UIElement(Arduino_GFX *d, UIDimensions dims, UIDecorations decor,
   strncpy(this->title, title, MAX_TITLE_LEN);
 }
 
+UIElement::~UIElement() {
+  // Destruction involves redrawing over the "old" area
+
+  // TODO: should we have a separate place to do all the drawing?
+  this->display->fillRect(this->dims.x, this->dims.y,
+                          this->dims.width, this->dims.height,
+                          this->decor.bgColor);
+}
+
 int16_t UIElement::getContentAreaX0() {
   if (this->decor.hasBorder) {
     return this->dims.x + DEFAULT_BORDER_THICKNESS + DEFAULT_MARGIN;
@@ -132,26 +141,30 @@ void UIElement::replaceString(char *oldVal, char *newVal) {
   }
 }
 
-bool UIElement::AddChild(ComponentType t) {
+int16_t UIElement::AddChild(ComponentType t) {
   if (childrenCount >= MAX_CHILDREN) {
     Serial2.println("Failed to add child: childrenCount exceeds MAX_CHILDREN");
     Serial2.print(  childrenCount);
     Serial2.print(  " >= ");
     Serial2.print(  MAX_CHILDREN);
-    return false;
+    return -1;
   }
 
   int16_t newElem = WindowPool::Allocate(t);
   if (newElem < 0) {
     Serial2.println("Failed to allocate new component");
-    return false;
+    return -1;
   }
 
   this->children[this->curChildIndex] = newElem;
   this->childrenCount++;
   this->curChildIndex++;
 
-  return true;
+  return newElem;
+}
+
+void UIElement::RemoveChild(int16_t childId) {
+  WindowPool::Deallocate(childId);
 }
 
 UIElement* UIElement::GetChild(int16_t childID) {

src/UIComponent.h

@@ -25,12 +25,14 @@ public:
   UIElement();
   UIElement(Arduino_GFX *d, UIDimensions dims, UIDecorations decor,
             char *Title);
+  ~UIElement();
 
   // Children
   int16_t children[MAX_CHILDREN];
 
   // Children Handling
-  bool AddChild(ComponentType t);
+  int16_t AddChild(ComponentType t);
+  void RemoveChild(int16_t childID);
   UIElement* GetChild(int16_t childID);
   uint8_t ChildrenCount();
 

src/windowPool.cpp

@@ -57,6 +57,7 @@ namespace WindowPool {
       case BAR:
         break;
       case STRING:
+        delete pool[id].str;
         break;
       case TABLE:
         break;

src/windowPool.h

@@ -1,6 +1,7 @@
 #ifndef __WINDOW_POOL__
 #define __WINDOW_POOL__
 
+#include <cstdint>
 #include <stdint.h>
 #include "values.h"
 
@@ -26,7 +27,7 @@ namespace WindowPool {
   int16_t Allocate(ComponentType t);
   // I will finish this later on, still have to figure out how to properly
   // destroy the UIComponent
-  void Deallocate();
+  void Deallocate(int16_t childID);
   UIElement* GetHandle(int16_t index);
   
   // Debugging