From 0064f11eb081f670370943209c186e393284b59a Mon Sep 17 00:00:00 2001
From: Jakob Meier <comcloudway@ccw.icu>
Date: Sat, 25 Feb 2023 11:11:32 +0100
Subject: [PATCH] Added ability to select item from inventory

---
 src/screens/inventory.rs | 74 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 72 insertions(+), 2 deletions(-)

diff --git a/src/screens/inventory.rs b/src/screens/inventory.rs
index 163ea94..3b0e900 100644
--- a/src/screens/inventory.rs
+++ b/src/screens/inventory.rs
@@ -31,7 +31,9 @@ pub struct Inventory {
     /// the page count depends on the amount of items
     /// and on how many slots to draw per page
     /// see SLOTS_PER_PAGE for more
-    page: usize
+    page: usize,
+    /// true if left mouse button is being held
+    is_mouse_down: bool
 }
 impl Inventory {
     pub fn new() -> Self {
@@ -49,7 +51,8 @@ impl Inventory {
             contents: cont,
             selected: Some(Block::Dirt),
             direction: Direction::North,
-            page: 0
+            page: 0,
+            is_mouse_down: false
         }
     }
     pub fn place(&mut self) -> Option<Block> {
@@ -178,6 +181,7 @@ impl GameComponent for Inventory {
             }
         }
 
+        // display page indicator
         let page_count = self.contents.len().div_ceil(SLOTS_PER_PAGE);
 
         draw_centered_text(
@@ -197,6 +201,72 @@ impl GameComponent for Inventory {
             return GameEvent::Quit;
         }
 
+        let page_count = self.contents.len().div_ceil(SLOTS_PER_PAGE);
+        if is_key_down(KeyCode::Left) {
+            if self.page == 0 {
+                if page_count > 0 {
+                    self.page = page_count - 1;
+                }
+            } else {
+                self.page -= 1;
+            }
+        }
+        if is_key_down(KeyCode::Right) {
+            if self.page +1 >= page_count {
+                self.page = 0;
+            } else {
+                self.page += 1;
+            }
+        }
+
+        if is_mouse_button_down(MouseButton::Left) {
+            self.is_mouse_down = true;
+        } else if self.is_mouse_down {
+            // mouse button released
+            self.is_mouse_down = false;
+            let (mx,my) = mouse_position();
+            // virtual render cycle
+            let mid_x = screen_width()/2.0;
+            let mid_y = screen_height()/2.0;
+
+            let smallest = if screen_width() < screen_height() {
+                screen_width()
+            } else {
+                screen_height()
+            };
+            // use 70% of screen width for slots
+            let width = smallest * 0.7;
+            let hslot_count = ((SLOTS_PER_PAGE as f32).sqrt()) as usize;
+            let slot_dim = width / hslot_count as f32;
+            // only use 90% of slot width for the actual item
+            // ensures enough space around item
+            let slot_render_dim = slot_dim * 0.9;
+
+            let ox = mid_x - (hslot_count as f32 /2.0) * slot_dim;
+            let oy = mid_y - (hslot_count as f32 /2.0) * slot_dim;
+            for x in 0..hslot_count {
+                for y in 0..hslot_count {
+                    let tx = ox + slot_dim * x as f32 + (slot_dim - slot_render_dim) / 2.0;
+                    let ty = oy + slot_dim * y as f32 + (slot_dim - slot_render_dim) / 2.0;
+
+                    if mx >= tx && mx <= tx + slot_render_dim
+                        && my >= ty && my <= ty + slot_render_dim {
+                            // clicked this item
+                            let mut list: Vec<(&Block, &usize)> = self.contents.iter().collect();
+                            list.sort_by(|a,b| a.0.get_name().cmp(b.0.get_name()));
+
+                            if let Some((block, _)) = list.get(self.page * SLOTS_PER_PAGE + x + y * hslot_count) {
+                                self.selected = Some((*block).clone());
+                            } else {
+                                self.selected = None;
+                            }
+
+                            return GameEvent::Quit;
+                        }
+                }
+            }
+        }
+
         GameEvent::None
     }
 }
-- 
2.38.5