50 lines
1.8 KiB
Rust
50 lines
1.8 KiB
Rust
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// Copyright (c) 2023 Sophie Herold
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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// SPDX-License-Identifier: GPL-3.0-or-later
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use super::*;
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impl LpImage {
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/// Stepwise scrolls inside an image when zoomed in
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pub fn pan(&self, direction: >k::PanDirection) {
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let sign = match direction {
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gtk::PanDirection::Left | gtk::PanDirection::Up => -1.,
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gtk::PanDirection::Right | gtk::PanDirection::Down => 1.,
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_ => {
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log::error!("Unknown pan direction {direction:?}");
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return;
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}
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};
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let (adjustment, max) = match direction {
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gtk::PanDirection::Left | gtk::PanDirection::Right => {
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(self.hadjustment(), self.max_hadjustment_value())
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}
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gtk::PanDirection::Up | gtk::PanDirection::Down => {
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(self.vadjustment(), self.max_vadjustment_value())
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}
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_ => {
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log::error!("Unknown pan direction {direction:?}");
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return;
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}
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};
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let value = (adjustment.value() + sign * adjustment.step_increment()).clamp(0., max);
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adjustment.set_value(value);
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}
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}
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