Very early KDE 6 release.

kwin/effects/smodpeekeffect/contents/code/main.js

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+/*
+ *    KWin - the KDE window manager
+ *    This file is part of the KDE project.
+ *
+ *    SPDX-FileCopyrightText: 2015 Thomas Lübking <thomas.luebking@gmail.com>
+ *
+ *    SPDX-License-Identifier: GPL-2.0-or-later
+ */
+/*global effect, effects, animate, animationTime, Effect, QEasingCurve */
+
+"use strict";
+
+var badBadWindowsEffect = {
+    duration: animationTime(450),
+    showingDesktop: false,
+    loadConfig: function () {
+        badBadWindowsEffect.duration = animationTime(450);
+    },
+    setShowingDesktop: function (showing) {
+        badBadWindowsEffect.showingDesktop = showing;
+
+    },
+    offToCorners: function (showing, frozenTime) {
+        if (typeof frozenTime === "undefined") {
+            frozenTime = -1;
+        }
+        var stackingOrder = effects.stackingOrder;
+        var screenGeo = effects.virtualScreenGeometry;
+        var xOffset = screenGeo.width / 16;
+        var yOffset = screenGeo.height / 16;
+
+            for (var i = 0; i < stackingOrder.length; ++i) {
+                var w = stackingOrder[i];
+
+                if (!w.managed && w.windowClass == "kwin_x11 kwin" && w.caption == "" && !w.hasDecoration) continue;
+                if (!w.hiddenByShowDesktop && !w.normalWindow) {
+                    continue;
+                }
+
+                // ignore invisible windows and such that do not have to be restored
+                if (!w.visible) {
+                    if (w.offToCornerId) {
+                        // if it was visible when the effect was activated delete its animation data
+                        cancel(w.offToCornerId);
+                        delete w.offToCornerId;
+                        delete w.apertureCorner;
+                    }
+                    continue;
+                }
+
+                // Don't touch docks
+                if (w.dock) {
+                    continue;
+                }
+
+                //console.log("Before: " + JSON.stringify(w));
+
+                if(showing) {
+                    if (!w.offToCornerId || !freezeInTime(w.offToCornerId, frozenTime)) {
+
+                        w.offToCornerId = set({
+                            window: w,
+                            duration: badBadWindowsEffect.duration,
+                            curve: QEasingCurve.InOutQuad,
+                            //delay: 10,
+                            animations: [{
+                                type: Effect.Opacity,
+                                to: 0.0,
+                                frozenTime: frozenTime
+
+                            }]
+                        });
+                        //console.log("script");
+                    }
+                } else {
+                    if (!w.visible) {
+                        cancel(w.offToCornerId);
+                        delete w.offToCornerId;
+                        delete w.apertureCorner;
+                        // This if the window was invisible and has become visible in the meantime
+                    } else if (!w.offToCornerId || !redirect(w.offToCornerId, Effect.Backward) || !freezeInTime(w.offToCornerId, frozenTime)) {
+                        /*animate({
+                            window: w,
+                            duration: badBadWindowsEffect.duration,
+                            curve: QEasingCurve.Linear,
+                            animations: [{
+                                type: Effect.Opacity,
+                                from: 0.0
+                            }]
+                        });*/
+                    }
+                }
+            }
+    },
+    animationEnded: function (w, a, meta) {
+        // After the animation that closes the effect, reset all the parameters
+        if (!badBadWindowsEffect.showingDesktop && w.offToCornerId != null) {
+            cancel(w.offToCornerId);
+            delete w.offToCornerId;
+            delete w.apertureCorner;
+        }
+    },
+    realtimeScreenEdgeCallback: function (border, deltaProgress, effectScreen) {
+        if (!deltaProgress || !effectScreen) {
+            badBadWindowsEffect.offToCorners(badBadWindowsEffect.showingDesktop, -1);
+            return;
+        }
+        let time = 0;
+
+        switch (border) {
+            case KWin.ElectricTop:
+            case KWin.ElectricBottom:
+                time = Math.min(1, (Math.abs(deltaProgress.height) / (effectScreen.geometry.height / 2))) * badBadWindowsEffect.duration;
+                break;
+            case KWin.ElectricLeft:
+            case KWin.ElectricRight:
+                time = Math.min(1, (Math.abs(deltaProgress.width) / (effectScreen.geometry.width / 2))) * badBadWindowsEffect.duration;
+                break;
+            default:
+                return;
+        }
+        if (badBadWindowsEffect.showingDesktop) {
+            time = badBadWindowsEffect.duration - time;
+        }
+
+        badBadWindowsEffect.offToCorners(true, time)
+    },
+    init: function () {
+        badBadWindowsEffect.loadConfig();
+        effects.showingDesktopChanged.connect(badBadWindowsEffect.setShowingDesktop);
+        effects.showingDesktopChanged.connect(badBadWindowsEffect.offToCorners);
+        effect.animationEnded.connect(badBadWindowsEffect.animationEnded);
+
+        //let edges = effect.touchEdgesForAction("show-desktop");
+
+        /*for (let i in edges) {
+            let edge = parseInt(edges[i]);
+            registerRealtimeScreenEdge(edge, badBadWindowsEffect.realtimeScreenEdgeCallback);
+        }*/
+    }
+};
+
+badBadWindowsEffect.init();

kwin/effects/smodpeekeffect/metadata.json

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+{
+    "KPackageStructure": "KWin/Effect",
+    "KPlugin": {
+        "Authors": [
+            {
+                "Name": "Souris"
+            }
+        ],
+        "Category": "Show Desktop Animation",
+        "Description": "Fade windows to reveal the desktop",
+        "EnabledByDefault": false,
+        "Id": "smodpeekeffect",
+        "License": "GPL",
+        "Name": "SMOD Peek"
+    },
+    "X-KDE-Ordering": 100,
+    "X-KWin-Exclusive-Category": "show-desktop",
+    "X-Plasma-API": "javascript",
+    "X-Plasma-MainScript": "code/main.js"
+}