add better centering to box layout

example/main.c

@@ -4,6 +4,7 @@
 
 typedef struct AppState {
     PangoFontDescription *desc;
+    PangoFontDescription *bold_desc;
 } AppState;
 
 UINode *main_view_scaffold(UINode *root, AppState *state)
@@ -12,26 +13,62 @@ UINode *main_view_scaffold(UINode *root, AppState *state)
         background_node_new(root, UISlate50, 0);
         UIBoxLayoutNode *layout = box_layout_new(root, UI_DIRECTION_VERTICAL);
         box_layout_set_margins(layout, 36);
-        layout->gap = 12;
+        layout->gap = 26;
-        layout->justify_secondary_dimension = UI_BOX_LAYOUT_JUSTIFY_CENTER;
     }
 
     {
-        UINode *input = (UINode*)text_input_new(root);
+        UINode *input_container;
-        background_node_new(input, UISlate200, 10);
+
-        input->width_policy = UI_SIZE_POLICY_STATIC;
+        {
-        input->height_policy = UI_SIZE_POLICY_GROW;
+            input_container = node_new(root, "input_container");
-        input->rect.w = 38;
+            input_container->width_policy = UI_SIZE_POLICY_GROW;
+            UIBoxLayoutNode *layout = box_layout_new(input_container, UI_DIRECTION_HORIZONTAL);
+            layout->gap = 8;
+            layout->justify_secondary = UI_BOX_LAYOUT_JUSTIFY_CENTER;
+        }
+
+        {
+            UINode *input = (UINode*)text_input_new(input_container);
+            background_node_new(input, UISlate100, 10);
+            input->width_policy = UI_SIZE_POLICY_GROW;
+            input->height_policy = UI_SIZE_POLICY_STATIC;
+            input->rect.h = 42;
 
             UIBoxLayoutNode *layout = box_layout_new(input, UI_DIRECTION_HORIZONTAL);
-        layout->justify_secondary_dimension = UI_BOX_LAYOUT_JUSTIFY_CENTER;
+            layout->justify_secondary = UI_BOX_LAYOUT_JUSTIFY_CENTER;
-        layout->margin_left = 0;
+            layout->margin_left = 6;
 
             UINode *input_text_container = node_new(input, "input_text_container");
             UITextNode *input_text = text_node_new(input_text_container, state->desc, UINeutral950, NULL);
             ((UITextInputNode*)input)->text_node = input_text;
         }
 
+        {
+            UINode *add_button = node_new(input_container, "button");
+            add_button->width_policy = UI_SIZE_POLICY_STATIC;
+            add_button->height_policy = UI_SIZE_POLICY_GROW;
+            add_button->rect.w = 42;
+            state_background_node_new(add_button, UIIndigo500, UIIndigo600, UIIndigo700, 8.0);
+            UIBoxLayoutNode *layout = box_layout_new(add_button, UI_DIRECTION_HORIZONTAL);
+            layout->justify_secondary = UI_BOX_LAYOUT_JUSTIFY_CENTER;
+            box_layout_set_margins(layout, 8);
+            UINode *text_container = node_new(add_button, "text_container");
+            text_node_new(text_container, state->desc, UINeutral50, "+");
+        }
+    }
+
+    {
+        UINode *item = node_new(root, "item");
+        item->width_policy = UI_SIZE_POLICY_GROW;
+        box_layout_new(item, UI_DIRECTION_HORIZONTAL)->justify_secondary = UI_BOX_LAYOUT_JUSTIFY_CENTER;
+        UINode *item_text_container = node_new(item, "item_text_container");
+        text_node_new(item_text_container, state->bold_desc, UINeutral950, "Test");
+        UINode *separator = node_new(item, "separator");
+        separator->width_policy = UI_SIZE_POLICY_GROW;
+        UINode *remove_button = node_new(item, "remove_button");
+        text_node_new(remove_button, state->desc, UINeutral700, "remove");
+    }
+    
     return root;
 }
 
@@ -44,7 +81,8 @@ int main(void)
     }
 
     AppState state = {
-        .desc = pango_font_description_from_string("Roboto:size=16")
+        .desc = pango_font_description_from_string("Roboto 12"),
+        .bold_desc = pango_font_description_from_string("Roboto Demi-Bold 12")
     };
 
     UINode *root = node_new(NULL, "[root]");

src/box-layout-node.c

@@ -75,12 +75,14 @@ int box_layout_handle(UINode *component, enum UIEvent ev, size_t d, void *p)
         if (ev == UI_EVENT_GET_EXTENTS) {
             ((UIRect*)p)->w = is_horizontal ? size : maximum_secondary_position;
             ((UIRect*)p)->h = is_vertical ? size : maximum_secondary_position;
+
             return UI_NODE_COMPUTED_EXTENTS_OK;
         }
 
-        // we can distribute growing layout children only if we have a fixed sized policy in the layout primary direction
         bool is_fixed_for_primary_direction = (is_horizontal && node->width_policy != UI_SIZE_POLICY_COMPUTED) || (is_vertical && node->height_policy != UI_SIZE_POLICY_COMPUTED);
         double primary_direction = is_horizontal ? node->rect.w - margin_left - margin_right : node->rect.h - margin_top - margin_bottom;
+
+        // we can distribute growing layout children only if we have a fixed sized policy in the layout primary direction
         bool distributes_growing_widgets = growing_widgets && is_fixed_for_primary_direction;
         double size_per_growing_widget = 0;
         // growing widgets are evenly sized among the remaining free space
@@ -93,6 +95,9 @@ int box_layout_handle(UINode *component, enum UIEvent ev, size_t d, void *p)
             }
         }
 
+        // if we are centered on the primary direction and we are fixed for the primary direction, we can center the elements on the primary direction
+        double primary_direction_start = !growing_widgets && is_fixed_for_primary_direction && box_layout_node->justify_primary == UI_BOX_LAYOUT_JUSTIFY_CENTER ? (primary_direction - size) / 2 : 0;
+
         bool is_fixed_for_secondary_direction = (is_horizontal && node->height_policy != UI_SIZE_POLICY_COMPUTED) || (is_vertical && node->width_policy != UI_SIZE_POLICY_COMPUTED);
         double secondary_direction = is_horizontal ? node->rect.h - margin_top - margin_bottom : node->rect.w - margin_left - margin_right;
         // if our layout secondary direction is fixed, we set the maximum known secondary position to it
@@ -100,8 +105,8 @@ int box_layout_handle(UINode *component, enum UIEvent ev, size_t d, void *p)
             maximum_secondary_position = secondary_direction;
         }
 
-        double x = margin_left;
+        double x = is_horizontal && primary_direction_start ? primary_direction_start : margin_left;
-        double y = margin_top;
+        double y = is_vertical && primary_direction_start ? primary_direction_start : margin_top;
         current_index = 0;
         for (int i = 0; i < node->nodes_count; i++) {
             UINode *current = node->nodes[i];
@@ -118,7 +123,7 @@ int box_layout_handle(UINode *component, enum UIEvent ev, size_t d, void *p)
                     x += gap;
                 }
                 current->rect.x = x;
-                if (box_layout_node->justify_secondary_dimension == UI_BOX_LAYOUT_JUSTIFY_CENTER) {
+                if (box_layout_node->justify_secondary == UI_BOX_LAYOUT_JUSTIFY_CENTER) {
                     current->rect.y = margin_top + (maximum_secondary_position - current->rect.h) / 2;
                 } else {
                     current->rect.y = y;
@@ -134,7 +139,7 @@ int box_layout_handle(UINode *component, enum UIEvent ev, size_t d, void *p)
                 if (current_index) {
                     y += gap;
                 }
-                if (box_layout_node->justify_secondary_dimension == UI_BOX_LAYOUT_JUSTIFY_CENTER) {
+                if (box_layout_node->justify_secondary == UI_BOX_LAYOUT_JUSTIFY_CENTER) {
                     current->rect.x = margin_left + (maximum_secondary_position - current->rect.w) / 2;
                 } else {
                     current->rect.x = x;
@@ -167,6 +172,8 @@ UIBoxLayoutNode *box_layout_new(UINode *parent, enum UIDirection direction)
     n->node.text = "box_layout";
     n->node.handle_proto = box_layout_handle;
     n->direction = direction;
+    n->justify_primary = UI_BOX_LAYOUT_JUSTIFY_START;
+    n->justify_secondary = UI_BOX_LAYOUT_JUSTIFY_START;
     n->margin_top = 0;
     n->margin_left = 0;
     n->margin_bottom = 0;

src/box-layout-node.h

@@ -11,7 +11,7 @@ enum UIBoxLayoutJustify {
 typedef struct UIBoxLayoutNode {
     UINode node;
     enum UIDirection direction;
-    enum UIBoxLayoutJustify justify_secondary_dimension;
+    enum UIBoxLayoutJustify justify_secondary, justify_primary;
     double margin_top, margin_left, margin_bottom, margin_right, gap;
 } UIBoxLayoutNode;
 

src/main.c

@@ -85,8 +85,17 @@ int app_handle(struct UINode *node, void *data, int event_type, size_t d, void *
             /* increment button */
             {
                 UINode *button = node_new(node, "button");
+                button->width_policy = UI_SIZE_POLICY_STATIC;
+                button->height_policy = UI_SIZE_POLICY_STATIC;
+                button->rect.w = 48;
+                button->rect.h = 48;
+                button->flags |= UI_NODE_CONSUMES_HITS;
+                UIBoxLayoutNode *layout = box_layout_new(button, UI_DIRECTION_HORIZONTAL);
+                layout->justify_primary = UI_BOX_LAYOUT_JUSTIFY_CENTER;
+                layout->justify_secondary = UI_BOX_LAYOUT_JUSTIFY_CENTER;
                 state_background_node_new(button, UIPurple600, UIPurple700, UIPurple800, 6.0);
-                text_node_new(button, state->font, UINeutral50, "add");
+                UINode *text_container = node_new(button, "text_container");
+                text_node_new(text_container, state->font, UINeutral50, "+");
                 dispatcher_new(button, UI_EVENT_UNPRESSED, INCREMENT_COUNT, state, app_handle);
             }
 

src/node.c

@@ -97,6 +97,9 @@ UINode *node_by_point(UINode *root, double x, double y)
     for (int i = 0; i < root->nodes_count; i++) {
         UINode *node = root->nodes[i];
         if (ui_rect_contains_point(&node->rect, x - node->window_rel_x, y - node->window_rel_y) && !(node->flags & UI_NODE_DISABLED)) {
+            if (node->flags & UI_NODE_CONSUMES_HITS) {
+                return node;
+            }
             return node_by_point(node, x, y);
         }
     }

src/node.h

@@ -70,6 +70,7 @@ typedef struct UINodeDispatchBucket {
 #define UI_NODE_COMPONENT (1 << 0)
 #define UI_NODE_RETAINS_PRESS (1 << 1)
 #define UI_NODE_DISABLED (1 << 2)
+#define UI_NODE_CONSUMES_HITS (1 << 3)
 
 #define UI_NODE_DISPATCH_BUCKETS (7)
 typedef struct UINode {

src/text-node.c

@@ -28,7 +28,10 @@ UITextNode *text_node_new(UINode *parent, PangoFontDescription *desc, UIRGBA col
 void text_node_set_text(UITextNode *text_node, char *text)
 {
     text_node->_pending_text = text;
-    text_node->node.cached_computed_extents = false;
+    if (text_node->node.parent) {
+        // TODO: do this better
+        text_node->node.parent->cached_computed_extents = false;
+    }
 }
 
 int text_node_handle(UINode *node, enum UIEvent ev, size_t d, void *p)

src/window.c

@@ -676,7 +676,7 @@ int window_turn(UIWindow *window)
 
         end_clock();
 
-        dump_summary(stdout);
+        //dump_summary(stdout);
     }
     return 0;
 }