mirror of
https://gitlab.gnome.org/june/top-bar-organizer.git
synced 2026-01-11 16:53:51 +01:00
Julian Schacher
edfa50f254Scroll the content of the preferences window on Drag-and-Drop, when the mouse is in the upper or lower part of the content of the preferences window. This helps a user, who has e.g. a lot of items, but the preferences window with a low height, to easily move any item to any position.
99 lines
3.5 KiB
JavaScript
99 lines
3.5 KiB
JavaScript
"use strict";
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/*
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* This file is part of Top-Bar-Organizer (a Gnome Shell Extension for
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* organizing your Gnome Shell top bar).
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* Copyright (C) 2021 Julian Schacher
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*
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* Top-Bar-Organizer 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 <https://www.gnu.org/licenses/>.
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*/
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/* exported ScrollManager */
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const GLib = imports.gi.GLib;
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var ScrollManager = class ScrollManager {
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/**
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* @param {Gtk.ScrolledWindow} gtkScrolledWindow
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*/
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constructor(gtkScrolledWindow) {
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this._gtkScrolledWindow = gtkScrolledWindow;
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this._scrollUp = false;
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this._scrollDown = false;
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}
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startScrollUp() {
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// If the scroll up is already started, don't do anything.
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if (this._scrollUp) return;
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// Make sure scroll down is stopped.
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this.stopScrollDown();
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this._scrollUp = true;
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GLib.timeout_add(GLib.PRIORITY_DEFAULT, 200, () => {
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// Set the new vadjustment value to either the current value minus a
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// step increment or to 0.
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const newVAdjustementValue = Math.max(this._gtkScrolledWindow.vadjustment.get_value() - this._gtkScrolledWindow.vadjustment.get_step_increment(), 0);
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// If the new value is the old one, return and stop this interval.
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if (newVAdjustementValue === this._gtkScrolledWindow.vadjustment.get_value()) {
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this._scrollUp = false;
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return this._scrollUp;
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}
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// Otherwise, update the value.
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this._gtkScrolledWindow.vadjustment.set_value(newVAdjustementValue);
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return this._scrollUp;
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});
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}
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startScrollDown() {
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// If the scroll down is already started, don't do anything.
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if (this._scrollDown) return;
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// Make sure scroll up is stopped.
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this.stopScrollUp();
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this._scrollDown = true;
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GLib.timeout_add(GLib.PRIORITY_DEFAULT, 200, () => {
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// Set the new vadjusment value either to the curent value plus a
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// step increment or to the upper value minus the page size.
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const newVAdjustementValue = Math.min(
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this._gtkScrolledWindow.vadjustment.get_value() + this._gtkScrolledWindow.vadjustment.get_step_increment(),
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this._gtkScrolledWindow.vadjustment.get_upper() - this._gtkScrolledWindow.vadjustment.get_page_size()
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);
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// If the new value is the old one, return and stop this interval.
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if (newVAdjustementValue === this._gtkScrolledWindow.vadjustment.get_value()) {
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this._scrollDown = false;
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return this._scrollDown;
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}
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// Otherwise, update the value.
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this._gtkScrolledWindow.vadjustment.set_value(newVAdjustementValue);
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return this._scrollDown;
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});
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}
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stopScrollUp() {
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this._scrollUp = false;
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}
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stopScrollDown() {
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this._scrollDown = false;
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}
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stopScrollAll() {
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this.stopScrollUp();
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this.stopScrollDown();
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}
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};
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