Very early KDE 6 release.

plasma/plasmoids/io.gitgud.wackyideas.win7showdesktop/contents/ui/MinimizeAllController.qml

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+/*
+	SPDX-FileCopyrightText: 2015 Sebastian Kügler <sebas@kde.org>
+	SPDX-FileCopyrightText: 2016 Anthony Fieroni <bvbfan@abv.bg>
+	SPDX-FileCopyrightText: 2018 David Edmundson <davidedmundson@kde.org>
+	SPDX-FileCopyrightText: 2022 ivan (@ratijas) tkachenko <me@ratijas.tk>
+
+	SPDX-License-Identifier: GPL-2.0-or-later
+*/
+
+import QtQml 2.15
+
+import org.kde.taskmanager 0.1 as TaskManager
+
+Controller {
+	id: controller
+
+	titleActive: i18nc("@action:button", "Restore All Minimized Windows")
+	titleInactive: i18nc("@action:button", "Minimize All Windows")
+
+	descriptionActive: i18nc("@info:tooltip", "Restores the previously minimized windows")
+	descriptionInactive: i18nc("@info:tooltip", "Shows the Desktop by minimizing all windows")
+
+	readonly property QtObject tasksModel: TaskManager.TasksModel {
+		id: tasksModel
+		sortMode: TaskManager.TasksModel.SortDisabled
+		groupMode: TaskManager.TasksModel.GroupDisabled
+	}
+
+	readonly property Connections activeTaskChangedConnection: Connections {
+		target: tasksModel
+		enabled: controller.active
+
+		function onActiveTaskChanged() {
+			if (tasksModel.activeTask.valid) { // to suppress changing focus to non windows, such as the desktop
+				controller.active = false;
+				controller.minimizedClients = [];
+			}
+		}
+
+		function onVirtualDesktopChanged() {
+			controller.deactivate();
+		}
+
+		function onActivityChanged() {
+			controller.deactivate();
+		}
+	}
+
+	/**
+	 * List of persistent model indexes from task manager model of
+	 * clients minimized by us
+	 */
+	property var minimizedClients: []
+
+	function activate() {
+		const clients = [];
+		for (let i = 0; i < tasksModel.count; i++) {
+			const idx = tasksModel.makeModelIndex(i);
+			if (!tasksModel.data(idx, TaskManager.AbstractTasksModel.IsHidden)) {
+				tasksModel.requestToggleMinimized(idx);
+				clients.push(tasksModel.makePersistentModelIndex(i));
+			}
+		}
+		minimizedClients = clients;
+		active = true;
+	}
+
+	function deactivate() {
+		active = false;
+		for (let i = 0; i < minimizedClients.length; i++) {
+			const idx = minimizedClients[i];
+			// client deleted, do nothing
+			if (!idx.valid) {
+				continue;
+			}
+			// if the user has restored it already, do nothing
+			if (!tasksModel.data(idx, TaskManager.AbstractTasksModel.IsHidden)) {
+				continue;
+			}
+			tasksModel.requestToggleMinimized(idx);
+		}
+		minimizedClients = [];
+	}
+
+	// override
+	function toggle() {
+		if (active) {
+			deactivate();
+		} else {
+			activate();
+		}
+	}
+}