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image_view: Expose file as a property instead of filename

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The GFile is more useful for other data. The window can
use expressions to calculate an appropriate title, so
we no longer need to call `set_title()` or connect to
a signal manually.

This commit also adjusts the `uri()` and `print()`
functions to use `active_file()`
This commit is contained in:
Christopher Davis 2022-07-26 12:07:08 -04:00
parent fa513596b2
commit 1e95dd4cbb
3 changed files with 46 additions and 36 deletions
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35
src/window.rs
View file

@ -83,6 +83,7 @@ mod imp {
// bind_template() is a function generated by the
// CompositeTemplate macro to bind all children at once.
Self::bind_template(klass);
Self::Type::bind_template_callbacks(klass);
// Set up actions
klass.install_action("win.toggle-fullscreen", None, move |win, _, _| {
@ -139,20 +140,12 @@ mod imp {
let help_overlay = builder.object("help_overlay").unwrap();
obj.set_help_overlay(Some(&help_overlay));
self.drop_target.set_types(&[gdk::FileList::static_type()]);
// For callbacks, you will want to reference the GTK docs on
// the relevant signal to see which parameters you need.
// In this case, we need one to react to the signal,
// so we name it `iv` then use `_` for the other spots.
self.image_view.connect_notify_local(
Some("filename"),
clone!(@weak obj => move |iv, _| {
if let Some(filename) = iv.filename() {
obj.set_title(Some(&filename));
}
}),
);
self.drop_target.set_types(&[gdk::FileList::static_type()]);
// In this case, we need only need the GValue,
// so we name it `value` then use `_` for the other spots.
self.drop_target.connect_drop(
clone!(@weak obj => @default-return false, move |_, value, _, _| {
// Here we use a GValue, which is a dynamic object that can hold different types,
@ -206,6 +199,7 @@ glib::wrapper! {
@implements gio::ActionMap, gio::ActionGroup, gtk::Native;
}
#[gtk::template_callbacks]
impl LpWindow {
pub fn new<A: IsA<gtk::Application>>(app: &A) -> Self {
glib::Object::new(&[("application", app)]).expect("Failed to create LpWindow")
@ -261,8 +255,7 @@ impl LpWindow {
if let Some(file) = imp
.image_view
.current_page()
.and_then(|p| p.file())
.active_file()
.and_then(|f| f.peek_path())
.and_then(|p| std::fs::File::open(p).ok())
{
@ -375,4 +368,18 @@ impl LpWindow {
self.set_default_size(final_width, final_height);
log::debug!("Window resized to {} x {}", final_width, final_height);
}
// In the LpWindow UI file we define a `gtk::Expression`s
// that is a closure. This closure takes the current `gio::File`
// and processes it to return a window title.
//
// In this function we chain `Option`s with `and_then()` in order
// to handle optional results with a fallback, without needing to
// have multiple `match` or `if let` branches, and without needing
// to unwrap.
#[template_callback]
fn window_title(&self, file: Option<gio::File>) -> String {
file.and_then(|f| util::get_file_display_name(&f)) // If the file exists, get display name
.unwrap_or_else(|| String::from("Image Viewer")) // Return that or the default if there's nothing
}
}