image: Reorganize into several sub-modules

src/widgets/image/rotation.rs

@@ -0,0 +1,84 @@
+// Copyright (c) 2023 Sophie Herold
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+use super::*;
+
+impl imp::LpImage {
+    pub fn set_rotation(&self, rotation: f64) {
+        let obj = self.obj();
+
+        if rotation == obj.rotation() {
+            return;
+        }
+
+        self.rotation.set(rotation);
+        obj.notify_rotation();
+        obj.queue_draw();
+    }
+
+    pub(super) fn set_mirrored(&self, mirrored: bool) {
+        let obj = self.obj();
+
+        if mirrored == obj.mirrored() {
+            return;
+        }
+
+        self.mirrored.set(mirrored);
+        obj.notify_mirrored();
+        obj.queue_draw();
+    }
+}
+
+impl LpImage {
+    /// Set rotation and mirroring to the state would have after loading
+    pub fn reset_rotation(&self) {
+        let orientation = self.metadata().orientation();
+        self.imp().rotation_target.set(-orientation.rotation);
+        self.set_mirrored(orientation.mirrored);
+        self.set_rotation(-orientation.rotation);
+    }
+
+    pub fn rotate_by(&self, angle: f64) {
+        log::debug!("Rotate by {} degrees", angle);
+        let target = &self.imp().rotation_target;
+        target.set(target.get() + angle);
+
+        let animation = self.rotation_animation();
+
+        animation.set_value_from(self.rotation());
+        animation.set_value_to(target.get());
+        animation.play();
+
+        if self.is_best_fit() {
+            let animation = self.zoom_animation();
+
+            animation.set_value_from(self.zoom());
+            animation.set_value_to(self.zoom_level_best_fit_for_rotation(target.get()));
+            animation.play();
+        }
+    }
+
+    pub(super) fn rotation_animation(&self) -> &adw::TimedAnimation {
+        self.imp().rotation_animation.get_or_init(|| {
+            adw::TimedAnimation::builder()
+                .duration(ROTATION_ANIMATION_DURATION)
+                .widget(self)
+                .target(&adw::PropertyAnimationTarget::new(self, "rotation"))
+                .build()
+        })
+    }
+}