Add Window Aperture effect for showing the desktop

It moves windows to nearest corners

effects/CMakeLists.txt

@@ -137,6 +137,7 @@ add_subdirectory( login )
 add_subdirectory( maximize )
 add_subdirectory( scalein )
 add_subdirectory( translucency )
+add_subdirectory( windowaperture )
 
 ###############################################################################
 # Built-in effects go here

effects/windowaperture/CMakeLists.txt

@@ -0,0 +1 @@
+add_subdirectory( package )

effects/windowaperture/package/CMakeLists.txt

@@ -0,0 +1,6 @@
+install(DIRECTORY contents DESTINATION ${DATA_INSTALL_DIR}/${KWIN_NAME}/effects/kwin4_effect_windowaperture)
+install(FILES metadata.desktop DESTINATION ${DATA_INSTALL_DIR}/${KWIN_NAME}/effects/kwin4_effect_windowaperture)
+
+install(FILES metadata.desktop
+        DESTINATION ${SERVICES_INSTALL_DIR}/${KWIN_NAME}
+        RENAME kwin4_effect_windowaperture.desktop)

effects/windowaperture/package/contents/code/main.js

@@ -0,0 +1,134 @@
+/********************************************************************
+ KWin - the KDE window manager
+ This file is part of the KDE project.
+
+ Copyright (C) 2015 Thomas Lübking <thomas.luebking@gmail.com>
+
+This program 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 2 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 <http://www.gnu.org/licenses/>.
+*********************************************************************/
+/*global effect, effects, animate, animationTime, Effect, QEasingCurve */
+
+var badBadWindowsEffect = {
+    duration: animationTime(250),
+    loadConfig: function () {
+        "use strict";
+        badBadWindowsEffect.duration = animationTime(250);
+    },
+    offToCorners: function (showing) {
+        "use strict";
+        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];
+
+            // ignore windows above the desktop (when not showing, pretty much everything would be)
+            if (w.desktopWindow && showing)
+                break;
+
+            // ignore invisible windows and such that do not have to be restored
+            if (!w.visible || (!showing && w.offToCornerId === undefined)) {
+                continue;
+            }
+
+            // keep windows above the desktop visually
+            effects.setElevatedWindow(w, showing);
+
+            // we just fade out docks - moving panels into edges looks dull
+            if (w.dock) {
+                if (showing) {
+                    w.offToCornerId = set({
+                        window: w,
+                        duration: badBadWindowsEffect.duration,
+                        animations: [{
+                            type: Effect.Opacity,
+                            to: 0.0
+                        }]
+                    });
+                } else {
+                    cancel(w.offToCornerId);
+                    delete w.offToCornerId;
+                    animate({
+                        window: w,
+                        duration: badBadWindowsEffect.duration,
+                        animations: [{
+                            type: Effect.Opacity,
+                            from: 0.0
+                        }]
+                    });
+                }
+                continue; // ! ;-)
+            }
+
+            // calculate the closest corner
+            var anchor, tx, ty;
+            var geo = w.geometry;
+            if (screenGeo.x + screenGeo.width - geo.x < geo.x + geo.width - screenGeo.x) {
+                tx = screenGeo.x + screenGeo.width - xOffset;
+                anchor = Effect.Left;
+            } else {
+                tx = xOffset;
+                anchor = Effect.Right;
+            }
+            if (screenGeo.y + screenGeo.height - geo.y < geo.y + geo.height - screenGeo.y) {
+                ty = screenGeo.y + screenGeo.height - yOffset;
+                anchor |= Effect.Top;
+            } else {
+                ty = yOffset;
+                anchor |= Effect.Bottom;
+            }
+
+            if (showing) {
+                w.offToCornerId = set({
+                    window: w,
+                    duration: badBadWindowsEffect.duration,
+                    curve: QEasingCurve.InOutQuad,
+                    animations: [{
+                        type: Effect.Position,
+                        targetAnchor: anchor,
+                        to: { value1: tx, value2: ty }
+                    },{
+                        type: Effect.Opacity,
+                        to: 0.2
+                    }]
+                });
+            } else {
+                cancel(w.offToCornerId);
+                delete w.offToCornerId;
+                animate({
+                    window: w,
+                    duration: badBadWindowsEffect.duration,
+                    curve: QEasingCurve.InOutQuad,
+                    animations: [{
+                        type: Effect.Position,
+                        sourceAnchor: anchor,
+                        from: { value1: tx, value2: ty }
+                    },{
+                        type: Effect.Opacity,
+                        from: 0.2
+                    }]
+                });
+            }
+        }
+
+    },
+    init: function () {
+        "use strict";
+        badBadWindowsEffect.loadConfig();
+        effects.showingDesktopChanged.connect(badBadWindowsEffect.offToCorners);
+    }
+};
+
+badBadWindowsEffect.init();

effects/windowaperture/package/metadata.desktop

@@ -0,0 +1,18 @@
+[Desktop Entry]
+Name=Window Aperture
+Icon=preferences-system-windows-effect-windowaperture
+Comment=Move window into the corners while showing desktop
+
+Type=Service
+X-Plasma-API=javascript
+X-Plasma-MainScript=code/main.js
+X-KDE-ServiceTypes=KWin/Effect
+X-KDE-PluginInfo-Author=Thomas Lübking
+X-KDE-PluginInfo-Email=thomas.luebking@gmail.com
+X-KDE-PluginInfo-Name=kwin4_effect_windowaperture
+X-KDE-PluginInfo-Version=0.1.0
+X-KDE-PluginInfo-Category=Appearance
+X-KDE-PluginInfo-Depends=
+X-KDE-PluginInfo-License=GPL
+X-KDE-PluginInfo-EnabledByDefault=true
+X-KDE-Ordering=50