Basic UI system

engine/breeze/ui/ui.h

@@ -5,11 +5,16 @@
 
 #include <raylib.h>
 
+typedef u32 BzUIFlags;
+typedef u32 BzUIKey;
+
 typedef enum BzUISizeKind {
     BZ_UI_SIZE_NULL,
     BZ_UI_SIZE_PIXELS,
     BZ_UI_SIZE_FIT,
-    BZ_UI_SIZE_REL_PARENT,
+    BZ_UI_SIZE_PARENT_PERCENT,
+    BZ_UI_SIZE_CHILD_SUM,
+    BZ_UI_SIZE_CHILD_MAX,
 } BzUISizeKind;
 
 typedef struct BzUISize {
@@ -17,59 +22,94 @@ typedef struct BzUISize {
     f32 value;
 } BzUISize;
 
+typedef enum BzUILayoutType {
+    BZ_UI_LAYOUT_NONE,
+    BZ_UI_LAYOUT_UNIDIR,
+    BZ_UI_LAYOUT_FLEX_BOX
+} BzUILayoutType;
+
+enum {
+    // UNIDIRECTIONAL
+    BZ_UI_UNIDIR_NONE   = 0,
+    BZ_UI_UNIDIR_ROW    = (1 << 0),
+    BZ_UI_UNIDIR_COLUMN = (1 << 1),
+    BZ_UI_UNIDIR_WRAP   = (1 << 2),
+    // FLEX BOX
+    BZ_UI_FLEX_NONE           = 0,
+    BZ_UI_FLEX_DIR_ROW        = (1 << 0),
+    BZ_UI_FLEX_DIR_COLUMN     = (1 << 1),
+    BZ_UI_FLEX_ALIGN_START    = (1 << 2),
+    BZ_UI_FLEX_ALIGN_CENTER   = (1 << 3),
+    BZ_UI_FLEX_ALIGN_END      = (1 << 4),
+    BZ_UI_FLEX_JUSTIFY_START  = (1 << 5),
+    BZ_UI_FLEX_JUSTIFY_CENTER = (1 << 6),
+    BZ_UI_FLEX_JUSTIFY_END    = (1 << 7)
+};
+
+typedef struct BzUILayout {
+    BzUILayoutType type;
+    BzUIFlags      flags;
+} BzUILayout;
+
+typedef struct BzUIStyle {
+    i32   fontSize;
+    i32   borderWidth;
+    Color textColor;
+    Color textHoverColor;
+    Color textActiveColor;
+    Color bgColor;
+    Color bgHoverColor;
+    Color bgActiveColor;
+    Color borderColor;
+    Color borderHoverColor;
+    Color borderActiveColor;
+} BzUIStyle;
+
+
+
 typedef enum BzUIAxis {
     BZ_UI_AXIS_X,
     BZ_UI_AXIS_Y,
     BZ_UI_AXIS_COUNT,
 } BzUIAxis;
 
-typedef u32 BzUIWidgetFlags;
 enum {
-    BZ_UI_WIDGET_CLICKABLE   = (1 << 0),
-    BZ_UI_WIDGET_VIEW_SCROLL = (1 << 1),
-    BZ_UI_WIDGET_DRAW_TEXT   = (1 << 2),
-    BZ_UI_WIDGET_DRAW_BORDER = (1 << 3),
+    BZ_UI_WIDGET_NONE               = 0,
+    BZ_UI_WIDGET_CLICKABLE          = (1 << 0),
+    BZ_UI_WIDGET_DRAW_TEXT          = (1 << 1),
+    BZ_UI_WIDGET_DRAW_BORDER        = (1 << 2),
+    BZ_UI_WIDGET_DRAW_BACKGROUND    = (1 << 3),
+    //BZ_UI_WIDGET_DRAW_SPRITE        = (1 << 4),
+    BZ_UI_WIDGET_ALIGN_HORIZ_START  = (1 << 5),
+    BZ_UI_WIDGET_ALIGN_HORIZ_CENTER = (1 << 6),
+    BZ_UI_WIDGET_ALIGN_HORIZ_END    = (1 << 7),
+    BZ_UI_WIDGET_ALIGN_VERT_START   = (1 << 8),
+    BZ_UI_WIDGET_ALIGN_VERT_CENTER  = (1 << 9),
+    BZ_UI_WIDGET_ALIGN_VERT_END     = (1 << 10),
+
+    BZ_UI_WIDGET_ALIGN_CENTER = BZ_UI_WIDGET_ALIGN_HORIZ_CENTER | BZ_UI_WIDGET_ALIGN_VERT_CENTER,
 };
 
-typedef u32 BzUIKey;
 
-typedef struct BzUIWidget BzUIWidget;
-typedef struct BzUIWidget {
-    BzUIWidget *first;
-    BzUIWidget *last;
-    BzUIWidget *next;
-    BzUIWidget *prev;
-    BzUIWidget *parent;
+typedef struct BzUINode BzUINode;
 
-    // Key+generation info
-    BzUIKey key;
-    u64 lastFrameTouchedIndex;
+typedef struct BzUIInteraction {
+    bool pressed  : 1;
+    bool down     : 1;
+    bool released : 1;
+    bool clicked  : 1;
+    //bool dragging : 1;
+    bool hovering : 1;
+} BzUIInteraction;
 
-    // Per-frame info provided by builders
-    BzUIWidgetFlags flags;
+typedef struct BzUINodeDesc {
+    BzUIFlags flags;
     const char *string;
+    BzUIKey key;
     BzUISize semanticSize[BZ_UI_AXIS_COUNT];
-
-    // recomputed every frame
-    f32 computedRelPosition[BZ_UI_AXIS_COUNT];
-    f32 computedSize[BZ_UI_AXIS_COUNT];
-    Rectangle rect;
-} BzUIWidget;
-
-typedef struct BzUIResult {
-    BzUIWidget *widget;
-    bool pressed;
-    bool released;
-    //bool dragging;
-    bool hovering;
-} BzUIResult;
-
-typedef struct BzUIWidgetDesc {
-    BzUIWidgetFlags flags;
-    const char *string;
-    BzUIKey key;
-
-} BzUIWidgetDesc;
+    BzUILayout layout;
+    BzUIStyle style;
+} BzUINodeDesc;
 
 typedef struct BzUI BzUI;
 
@@ -84,15 +124,20 @@ void bzUIEnd(BzUI *ui);
 
 // Widget construction
 
-BzUIWidget *bzUIWidgetMake(const BzUIWidgetDesc *desc);
+BzUINode *bzUINodeMake(BzUI *ui, const BzUINodeDesc *desc);
 
-BzUIWidget *bzUIPushParent(BzUIWidget *widget);
-BzUIWidget *bzUIPopParent();
+BzUINode *bzUIPushParent(BzUI *ui, BzUINode *node);
+BzUINode *bzUIPopParent(BzUI *ui);
 
-BzUIResult bzUIGetResult(BzUIWidget *widget);
+// Widget layout
+void bzUIPushLayout(BzUI *ui, BzUILayout layout);
+void bzUIPopLayout(BzUI *ui);
+
+// Widget interaction
+BzUIInteraction bzUIGetInteraction(BzUI *ui, BzUINode *node);
 
 // UI
 
-bool bzUIButton(const char *string);
+bool bzUIButton(BzUI *ui, const char *string, BzUIStyle *style);
 
 #endif //BREEZE_UI_CORE_H