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image: Add double click for zoom/fullscreen

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Zooms on touchscreens and fullscreens otherwise.
Using the fullscreen behavior for now, since that's what
a lot of other apps do.
This commit is contained in:
Sophie Herold 2023-02-06 18:40:32 +01:00
parent aa7a2dfd93
commit 169dd454cc
3 changed files with 40 additions and 4 deletions
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38
src/widgets/image.rs
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@ -30,13 +30,22 @@ use once_cell::unsync::OnceCell;
use std::cell::{Cell, RefCell};
use std::path::{Path, PathBuf};
/// Milliseconds
const ZOOM_ANIMATION_DURATION: u32 = 200;
/// Milliseconds
const ROTATION_ANIMATION_DURATION: u32 = 200;
/// Relative to current zoom level
const ZOOM_FACTOR_BUTTON: f64 = 1.5;
/// Relative to current zoom level
const ZOOM_FACTOR_WHEEL: f64 = 1.3;
const ZOOM_FACTOR_WHEEL_HI_RES: f64 = 0.1;
/// Relative to current zoom level
const ZOOM_FACTOR_WHEEL_HI_RES: f64 = 0.001;
/// Relative to best-fit level
const ZOOM_FACTOR_DOUBLE_TAP: f64 = 2.5;
/// Max zoom level 2000%
const MAX_ZOOM_LEVEL: f64 = 20.0;
mod imp {
@ -304,6 +313,33 @@ mod imp {
fn connect_gestures(&self) {
let obj = self.instance();
// Double click for fullscreen (mouse/touchpad) or zoom (touch screen)
let left_click_gesture = gtk::GestureClick::builder().button(1).build();
obj.add_controller(&left_click_gesture);
left_click_gesture.connect_pressed(
glib::clone!(@weak obj => move |gesture, n_press, x, y| {
// only handle double clicks
if n_press != 2 {
return;
}
if gesture.device().map(|x| x.source()) == Some(gdk::InputSource::Touchscreen) {
// zoom
obj.imp().pointer_position.set(Some((x, y)));
if obj.is_best_fit() {
// zoom in
obj.zoom_to(ZOOM_FACTOR_DOUBLE_TAP * obj.zoom_level_best_fit());
} else {
// zoom back out
obj.zoom_best_fit();
}
} else {
// fullscreen
obj.activate_action("win.toggle-fullscreen", None).unwrap();
}
}),
);
// Drag for moving image around
let drag_gesture = gtk::GestureDrag::new();
obj.add_controller(&drag_gesture);