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Update: Scroll preferences window content on Drag-and-Drop

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Scroll 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.
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June 2021-07-04 05:16:32 +02:00
commit edfa50f254
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3 changed files with 127 additions and 2 deletions
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src/prefsModules/ScrollManager.js Normal file
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"use strict";
/*
* This file is part of Top-Bar-Organizer (a Gnome Shell Extension for
* organizing your Gnome Shell top bar).
* Copyright (C) 2021 Julian Schacher
*
* Top-Bar-Organizer is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/* exported ScrollManager */
const GLib = imports.gi.GLib;
var ScrollManager = class ScrollManager {
/**
* @param {Gtk.ScrolledWindow} gtkScrolledWindow
*/
constructor(gtkScrolledWindow) {
this._gtkScrolledWindow = gtkScrolledWindow;
this._scrollUp = false;
this._scrollDown = false;
}
startScrollUp() {
// If the scroll up is already started, don't do anything.
if (this._scrollUp) return;
// Make sure scroll down is stopped.
this.stopScrollDown();
this._scrollUp = true;
GLib.timeout_add(GLib.PRIORITY_DEFAULT, 200, () => {
// Set the new vadjustment value to either the current value minus a
// step increment or to 0.
const newVAdjustementValue = Math.max(this._gtkScrolledWindow.vadjustment.get_value() - this._gtkScrolledWindow.vadjustment.get_step_increment(), 0);
// If the new value is the old one, return and stop this interval.
if (newVAdjustementValue === this._gtkScrolledWindow.vadjustment.get_value()) {
this._scrollUp = false;
return this._scrollUp;
}
// Otherwise, update the value.
this._gtkScrolledWindow.vadjustment.set_value(newVAdjustementValue);
return this._scrollUp;
});
}
startScrollDown() {
// If the scroll down is already started, don't do anything.
if (this._scrollDown) return;
// Make sure scroll up is stopped.
this.stopScrollUp();
this._scrollDown = true;
GLib.timeout_add(GLib.PRIORITY_DEFAULT, 200, () => {
// Set the new vadjusment value either to the curent value plus a
// step increment or to the upper value minus the page size.
const newVAdjustementValue = Math.min(
this._gtkScrolledWindow.vadjustment.get_value() + this._gtkScrolledWindow.vadjustment.get_step_increment(),
this._gtkScrolledWindow.vadjustment.get_upper() - this._gtkScrolledWindow.vadjustment.get_page_size()
);
// If the new value is the old one, return and stop this interval.
if (newVAdjustementValue === this._gtkScrolledWindow.vadjustment.get_value()) {
this._scrollDown = false;
return this._scrollDown;
}
// Otherwise, update the value.
this._gtkScrolledWindow.vadjustment.set_value(newVAdjustementValue);
return this._scrollDown;
});
}
stopScrollUp() {
this._scrollUp = false;
}
stopScrollDown() {
this._scrollDown = false;
}
stopScrollAll() {
this.stopScrollUp();
this.stopScrollDown();
}
};