From a8693c50efd7ccc699d347de00303bd000bed71a Mon Sep 17 00:00:00 2001
From: Sophie Herold <sophie@hemio.de>
Date: Wed, 26 Apr 2023 21:17:03 +0200
Subject: [PATCH] fullscreen: Hide headerbar on idle

Closes #154
---
 Cargo.toml               |  2 +-
 data/gtk/window.ui       | 38 ++++++++++++++++++++-------
 data/resources/style.css |  6 ++++-
 meson.build              |  2 +-
 src/window.rs            | 57 +++++++++++++++++++++++++++++++++++++++-
 5 files changed, 92 insertions(+), 13 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index f4eaaa8..97e341a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -47,7 +47,7 @@ features = ["v2_74"]
 [dependencies.adw]
 package = "libadwaita"
 version = "0.4.1"
-features = ["v1_3"]
+features = ["v1_4"]
 
 [dependencies.gettext-rs]
 version = "0.7.0"
diff --git a/data/gtk/window.ui b/data/gtk/window.ui
index bb127f4..296c552 100644
--- a/data/gtk/window.ui
+++ b/data/gtk/window.ui
@@ -68,11 +68,28 @@
       </closure>
     </binding>
     <property name="content">
-      <object class="GtkBox">
-        <property name="orientation">vertical</property>
-        <child>
-          <object class="GtkHeaderBar" id="headerbar">
-            <property name="show-title-buttons" bind-source="LpWindow" bind-property="fullscreened" bind-flags="sync-create|invert-boolean"/>
+      <object class="AdwToolbarView" id="toolbar_view">
+        <binding name="top-bar-style">
+          <closure type="AdwToolbarStyle" function="top_bar_style">
+            <lookup name="fullscreened">LpWindow</lookup>
+            <lookup name="active">properties_button</lookup>
+            <lookup name="active">primary_menu</lookup>
+          </closure>
+        </binding>
+        <binding name="extend-content-to-top-edge">
+          <closure type="gboolean" function="extend_to_top">
+            <lookup name="fullscreened">LpWindow</lookup>
+            <lookup name="active">properties_button</lookup>
+            <lookup name="active">primary_menu</lookup>
+          </closure>
+        </binding>
+        <child type="top">
+          <object class="AdwHeaderBar" id="headerbar">
+            <property name="show-end-title-buttons" bind-source="LpWindow" bind-property="fullscreened" bind-flags="sync-create|invert-boolean"/>
+            <property name="show-start-title-buttons" bind-source="LpWindow" bind-property="fullscreened" bind-flags="sync-create|invert-boolean"/>"
+            <style>
+              <class name="fullscreen-osd" />
+            </style>
             <child type="start">
               <object class="GtkButton">
                 <property name="icon-name">edit-copy-symbolic</property>
@@ -88,7 +105,7 @@
               </object>
             </child>
             <child type="end">
-              <object class="GtkMenuButton">
+              <object class="GtkMenuButton" id="primary_menu">
                 <property name="icon-name">open-menu-symbolic</property>
                 <property name="tooltip-text" translatable="yes">Main Menu</property>
                 <property name="primary">True</property>
@@ -125,9 +142,12 @@
                 <property name="tooltip-text" translatable="yes">Image Properties</property>
               </object>
             </child>
+            <child>
+              <object class="GtkEventControllerMotion" id="headerbar_events" />
+            </child>
           </object>
         </child>
-        <child>
+        <property name="content">
           <object class="AdwToastOverlay" id="toast_overlay">
             <property name="child">
               <object class="AdwFlap" id="properties_flap">
@@ -185,14 +205,14 @@
               </object>
             </property>
           </object>
-        </child>
+        </property>
       </object>
     </property>
     <child>
       <object class="GtkEventControllerMotion" id="motion_controller">
         <signal name="motion" handler="on_motion_cb" swapped="yes"/>
         <signal name="enter" handler="on_motion_cb" swapped="yes"/>
-	<signal name="leave" handler="on_motion_cb" swapped="yes"/>
+        <signal name="leave" handler="on_motion_cb" swapped="yes"/>
       </object>
     </child>
   </template>
diff --git a/data/resources/style.css b/data/resources/style.css
index 31ecc82..6a6a0db 100644
--- a/data/resources/style.css
+++ b/data/resources/style.css
@@ -4,6 +4,10 @@ button.osd.circular {
   min-height: 42px;
 }
 
+.fullscreen revealer:not(.raised) .fullscreen-osd {
+  background: rgba(0, 0, 0, 0.65);
+}
+
 shadow, border, outline {
   background: none;
 }
@@ -29,4 +33,4 @@ lpprintpreview {
   background-color: rgb(240, 240, 240);
   border-radius: 4px;
   box-shadow: 0 0 14px 1px black;
-}
\ No newline at end of file
+}
diff --git a/meson.build b/meson.build
index 5b41660..cf3b9af 100644
--- a/meson.build
+++ b/meson.build
@@ -9,7 +9,7 @@ i18n = import('i18n')
 gnome = import('gnome')
 
 dependency('gtk4', version: '>=4.11.1')
-dependency('libadwaita-1', version: '>=1.3.0')
+dependency('libadwaita-1', version: '>=1.3.99')
 dependency('gweather4', version: '>=4.0.0')
 dependency('libheif', version: '>=1.14.2')
 dependency('lcms2', version: '>=2.12.0')
diff --git a/src/window.rs b/src/window.rs
index 5f50442..151f3dc 100644
--- a/src/window.rs
+++ b/src/window.rs
@@ -72,7 +72,11 @@ mod imp {
         // TemplateChild<T> wrapper, where T is the
         // object type of the template child.
         #[template_child]
-        pub(super) headerbar: TemplateChild<gtk::HeaderBar>,
+        pub(super) toolbar_view: TemplateChild<adw::ToolbarView>,
+        #[template_child]
+        pub(super) headerbar: TemplateChild<adw::HeaderBar>,
+        #[template_child]
+        pub(super) headerbar_events: TemplateChild<gtk::EventControllerMotion>,
         #[template_child]
         pub(super) properties_button: TemplateChild<gtk::ToggleButton>,
         #[template_child]
@@ -87,6 +91,7 @@ mod imp {
         pub(super) properties_view: TemplateChild<LpPropertiesView>,
         #[template_child]
         pub(super) drop_target: TemplateChild<gtk::DropTarget>,
+        /// Motion controller for complete window
         #[template_child]
         pub(super) motion_controller: TemplateChild<gtk::EventControllerMotion>,
 
@@ -300,6 +305,10 @@ mod imp {
                 }),
             );
 
+            self.toolbar_view.connect_top_bar_style_notify(
+                glib::clone!(@weak obj => move |_| obj.on_top_bar_style_notify()),
+            );
+
             self.image_view.connect_notify_local(
                 Some("current-page"),
                 glib::clone!(@weak obj => move |_, _| {
@@ -590,6 +599,10 @@ impl LpWindow {
         self.imp().image_view.clone()
     }
 
+    pub fn headerbar(&self) -> adw::HeaderBar {
+        self.imp().headerbar.clone()
+    }
+
     fn show_toast(&self, text: impl AsRef<str>, priority: adw::ToastPriority) {
         let imp = self.imp();
 
@@ -691,6 +704,12 @@ impl LpWindow {
         self.image_view().controls_box_start().set_opacity(opacity);
         self.image_view().controls_box_end().set_opacity(opacity);
 
+        if self.is_headerbar_flat() {
+            self.headerbar().set_opacity(opacity);
+        } else {
+            self.headerbar().set_opacity(1.);
+        }
+
         if self.is_fullscreened() && hiding && opacity < 0.9 {
             self.set_cursor(gdk::Cursor::from_name("none", None).as_ref());
         } else {
@@ -839,6 +858,7 @@ impl LpWindow {
                 .controls_box_end_events()
                 .contains_pointer()
             && self.is_showing_image()
+            && (!self.is_headerbar_flat() || !self.imp().headerbar_events.contains_pointer())
     }
 
     #[template_callback]
@@ -849,4 +869,39 @@ impl LpWindow {
         }
         self.queue_hide_controls();
     }
+
+    fn is_headerbar_flat(&self) -> bool {
+        matches!(
+            self.imp().toolbar_view.top_bar_style(),
+            adw::ToolbarStyle::Flat
+        )
+    }
+
+    fn on_top_bar_style_notify(&self) {
+        if self.is_headerbar_flat() {
+            // Bring headerbar opacity in sync with controls
+            self.headerbar().set_opacity(self.controls_opacity());
+        } else {
+            self.headerbar().set_opacity(1.);
+        }
+    }
+
+    #[template_callback]
+    fn extend_to_top(&self, fullscreened: bool, show_properties: bool, show_menu: bool) -> bool {
+        fullscreened && !show_properties && !show_menu
+    }
+
+    #[template_callback]
+    fn top_bar_style(
+        &self,
+        fullscreened: bool,
+        show_properties: bool,
+        show_menu: bool,
+    ) -> adw::ToolbarStyle {
+        if self.extend_to_top(fullscreened, show_properties, show_menu) {
+            adw::ToolbarStyle::Flat
+        } else {
+            adw::ToolbarStyle::Raised
+        }
+    }
 }