application: Introduce data model struct and view structs.

[gps-watch.git] / src / application / model.rs

diff --git a/src/application/model.rs b/src/application/model.rs
new file mode 100644 (file)
index 0000000..a056af5
--- /dev/null
+++ b/src/application/model.rs
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2020 Tilman Sauerbeck (tilman at code-monkey de)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+pub enum Field {
+    UnixTime(u32),
+    Distance(u32),
+}
+
+pub struct Model {
+    pub unix_time: u32,
+    pub distance_cm: u32,
+
+    is_dirty: u32,
+}
+
+impl Model {
+    pub fn new() -> Model {
+        Model {
+            unix_time: 0,
+            distance_cm: 0,
+            is_dirty: 0,
+        }
+    }
+
+    pub fn reset(&mut self) {
+        if self.distance_cm != 0 {
+            self.distance_cm = 0;
+            self.is_dirty |= Model::dirty_mask(Field::Distance(0));
+        }
+    }
+
+    pub fn update(&mut self, data: Field) {
+        match data {
+            Field::UnixTime(unix_time) => {
+                if self.unix_time != unix_time {
+                    self.unix_time = unix_time;
+                    self.is_dirty |= Model::dirty_mask(data);
+                }
+            },
+            Field::Distance(distance_cm) => {
+                if self.distance_cm != distance_cm {
+                    self.distance_cm = distance_cm;
+                    self.is_dirty |= Model::dirty_mask(data);
+                }
+            },
+        }
+    }
+
+    pub fn check_and_reset_is_dirty(&mut self, data: Field) -> bool {
+        let mask = Model::dirty_mask(data);
+
+        if (self.is_dirty & mask) == 0 {
+            false
+        } else {
+            self.is_dirty &= !mask;
+
+            true
+        }
+    }
+
+    fn dirty_mask(data: Field) -> u32 {
+        match data {
+            Field::UnixTime(_) => 1,
+            Field::Distance(_) => 2,
+        }
+    }
+}