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zooming: Add support for zooming by scrolling while holding CTRL

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This commit is contained in:
Tom A. Wagner
2022-11-09 16:42:15 +01:00
committed by Tom Wagner
parent 727326aca4
commit 1d10c179cc
1 changed files with 39 additions and 1 deletions
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40
src/view/graph_view.rs
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@@ -37,7 +37,11 @@ mod imp {
use std::cell::{Cell, RefCell};
use gtk::{gdk::RGBA, graphene::Rect, gsk::ColorStop};
use gtk::{
gdk::{self, RGBA},
graphene::Rect,
gsk::ColorStop,
};
use log::warn;
use once_cell::sync::Lazy;
@@ -82,6 +86,7 @@ mod imp {
obj.set_overflow(gtk::Overflow::Hidden);
self.setup_node_dragging();
self.setup_scroll_zooming();
}
fn dispose(&self, _obj: &Self::Type) {
@@ -291,6 +296,39 @@ mod imp {
obj.add_controller(&drag_controller);
}
fn setup_scroll_zooming(&self) {
let obj = self.instance();
// We're only interested in the vertical axis, but for devices like touchpads,
// not capturing a small accidental horizontal move may cause the scroll to be disrupted if a widget
// higher up captures it instead.
let scroll_controller =
gtk::EventControllerScroll::new(gtk::EventControllerScrollFlags::BOTH_AXES);
scroll_controller.connect_scroll(|eventcontroller, _, delta_y| {
let event = eventcontroller.current_event().unwrap(); // We are inside the event handler, so it must have an event
if event
.modifier_state()
.contains(gdk::ModifierType::CONTROL_MASK)
{
let widget = eventcontroller
.widget()
.downcast::<super::GraphView>()
.unwrap();
widget.set_zoom_factor(
(widget.zoom_factor() + (0.1 * -delta_y))
.clamp(super::GraphView::ZOOM_MIN, super::GraphView::ZOOM_MAX),
);
gtk::Inhibit(true)
} else {
gtk::Inhibit(false)
}
});
obj.add_controller(&scroll_controller);
}
fn snapshot_background(&self, widget: &super::GraphView, snapshot: &gtk::Snapshot) {
// Grid size and line width during neutral zoom (factor 1.0).
const NORMAL_GRID_SIZE: f32 = 20.0;