Add layouts and decouple immediate drawings

src/k3menu.h

@@ -3,8 +3,9 @@
 #include<stdint.h>
 #include<stdlib.h>
 #include<stdbool.h>
-#include"k3font.h"
+#include<stddef.h>
 
+struct k3Font;
 struct k3MObj;
 
 #define k3M_EVENT_MOUSE_ENTER 0
@@ -18,7 +19,9 @@ struct k3MObj;
 #define k3M_EVENT_INPUT 8
 #define k3M_EVENT_DRAW 9
 #define k3M_EVENT_COMPLETE 10
-#define k3M_EVENT_ALL 11
+#define k3M_EVENT_MEASURE 11
+#define k3M_EVENT_ARRANGE 12
+#define k3M_EVENT_ALL 13
 
 #define k3M_MOUSE_BUTTON_0 0
 #define k3M_MOUSE_BUTTON_1 1
@@ -30,6 +33,16 @@ struct k3MObj;
 
 #define k3M_USERDATA_SIZE 16
 
+#define k3M_ALIGN_LEFT 0
+#define k3M_ALIGN_CENTER 1
+#define k3M_ALIGN_RIGHT 2
+
+#ifdef k3M_FIXED_POINT
+typedef uint8_t k3MCC;
+#else
+typedef float k3MCC;
+#endif
+
 struct k3MEvent {
 	uint16_t code;
 	
@@ -64,6 +77,8 @@ typedef struct k3MEventHandler {
 enum k3MPropertyType {
 	k3M_PROP_BG_COLOR,
 	k3M_PROP_BORDER_RADIUS,
+	k3M_PROP_MARGIN,
+	k3M_PROP_HORIZONTAL_ALIGNMENT,
 };
 struct k3MProperty {
 	enum k3MPropertyType type;
@@ -85,6 +100,9 @@ struct k3MObj {
 	int16_t w;
 	int16_t h;
 	
+	int16_t wDesired;
+	int16_t hDesired;
+	
 	bool invisible, hovered, disabled;
 	
 	k3MEventHandler *handlers;
@@ -93,6 +111,16 @@ struct k3MObj {
 	struct k3MProperty *properties;
 	size_t propertyCount;
 };
+struct k3MObj *k3MObj();
+
+/* Akin to the measure pass of WPF. Recursive, called by parent. Sets wDesired and hDesired. */
+void k3MMeasure(struct k3MObj *this);
+
+/* Akin to the arrange pass of WPF. Recursive, called by parent after w and h is set. Adjusts all children using it's own definitive size. */
+void k3MArrange(struct k3MObj *this);
+
+/* Set linear layout management on this object. Must not be called on descendants of k3MObj. */
+void k3MSetLayoutLinear(struct k3MObj *this, bool vertical);
 
 #define k3MenuSetBounds(a, x, y, w, h) k3MenuSetBounds_((struct k3MObj*) (a), (x), (y), (w), (h))
 void k3MenuSetBounds_(struct k3MObj *this, int16_t x, int16_t y, int16_t w, int16_t h);