[gnome-shell/eos3.8: 110/255] appDisplay: Add the App Center icon to the grid

[Matthew Leeds <mwleeds src gnome org>]

commit eca7e36138ffc2b2f001ba713147775e665bead8
Author: Joaquim Rocha <jrocha endlessm com>
Date:   Wed Jun 21 17:38:11 2017 +0200

    appDisplay: Add the App Center icon to the grid
    
    The icon is added at the end of the grid and, unlike other icons, is
    non-draggable, non-editable, and has no popup menu. It will be only
    added if enabled through a GSettings key 'enable-app-center', so that
    it can be configured without it for special environments like demos
    or eosinstaller images.
    
     * 2020-03-20:
          + Remove GSetting to hide app center
          + Squash with c9e3e4ba1
          + Squash with 6a3abd33a
    
    https://phabricator.endlessm.com/T17661
    https://phabricator.endlessm.com/T17787
    https://phabricator.endlessm.com/T17875
    https://phabricator.endlessm.com/T18933

 data/gnome-shell-theme.gresource.xml |   2 +
 data/theme/trash-icon-empty.png      | Bin 0 -> 6370 bytes
 data/theme/trash-icon-full.png       | Bin 0 -> 6420 bytes
 js/ui/appDisplay.js                  |  95 +++++++++++++++++++++++++++++++++++
 4 files changed, 97 insertions(+)
---
diff --git a/data/gnome-shell-theme.gresource.xml b/data/gnome-shell-theme.gresource.xml
index 63673241a1..907d05dc25 100644
--- a/data/gnome-shell-theme.gresource.xml
+++ b/data/gnome-shell-theme.gresource.xml
@@ -50,5 +50,7 @@
     <file>mini-icon-active-indicator.png</file>
     <file>process-working-dark.svg</file>
     <file>system-logout.png</file>
+    <file>trash-icon-empty.png</file>
+    <file>trash-icon-full.png</file>
   </gresource>
 </gresources>
diff --git a/data/theme/trash-icon-empty.png b/data/theme/trash-icon-empty.png
new file mode 100644
index 0000000000..cb8c746ea5
Binary files /dev/null and b/data/theme/trash-icon-empty.png differ
diff --git a/data/theme/trash-icon-full.png b/data/theme/trash-icon-full.png
new file mode 100644
index 0000000000..35d56ce356
Binary files /dev/null and b/data/theme/trash-icon-full.png differ
diff --git a/js/ui/appDisplay.js b/js/ui/appDisplay.js
index 9bbe8cfc87..f89449d584 100644
--- a/js/ui/appDisplay.js
+++ b/js/ui/appDisplay.js
@@ -484,6 +484,7 @@ class AppDisplay extends BaseAppView {
         this.bind_property('mapped', this._bgAction,
             'enabled', GObject.BindingFlags.SYNC_CREATE);
 
+        this._appCenterIcon = null;
         this._currentDialog = null;
         this._displayingDialog = false;
         this._currentDialogDestroyId = 0;
@@ -619,9 +620,25 @@ class AppDisplay extends BaseAppView {
             appIcons.push(icon);
         });
 
+        // Add the App Center icon if it is enabled (and installed)
+        this._maybeAddAppCenterIcon(appIcons);
+
         return appIcons;
     }
 
+    _maybeAddAppCenterIcon(apps) {
+        let appSys = Shell.AppSystem.get_default();
+        if (!appSys.lookup_app(EOS_APP_CENTER_ID)) {
+            log('App center %s is not installed'.format(EOS_APP_CENTER_ID));
+            return;
+        }
+
+        if (!this._appCenterIcon)
+            this._appCenterIcon = new AppCenterIcon();
+
+        apps.push(this._appCenterIcon);
+    }
+
     // Overridden from BaseAppView
     animate(animationDirection, onComplete) {
         this._scrollView.reactive = false;
@@ -2438,3 +2455,81 @@ class SystemActionIcon extends Search.GridSearchResult {
         Main.overview.viewSelector.show(2);
     }
 });
+
+var AppCenterIcon = GObject.registerClass(
+class AppCenterIcon extends AppIcon {
+    _init() {
+        let viewIconParams = {
+            isDraggable: false,
+            showMenu: false,
+        };
+
+        let iconParams = {
+            createIcon: this._createIcon.bind(this),
+        };
+
+        let appSys = Shell.AppSystem.get_default();
+        let app = appSys.lookup_app(EOS_APP_CENTER_ID);
+
+        super._init(app, viewIconParams, iconParams);
+
+        this._id = EOS_APP_CENTER_ID;
+        this._name = this.app.get_generic_name();
+        this.icon.label.text = this.name;
+    }
+
+    _onDragBegin() {
+        super._onDragBegin();
+
+        this.icon.label.text = _("Remove");
+        this.icon.update();
+    }
+
+    _onDragEnd() {
+        super._onDragEnd();
+
+        this.icon.label.text = this.app.get_generic_name();
+        this.icon.update();
+    }
+
+    _setHoveringByDnd(hovering) {
+        this._hovering = hovering;
+
+        this.icon.update();
+    }
+
+    _createIcon(iconSize) {
+        if (!this._dragMonitor)
+            return super._createIcon(iconSize);
+
+        let iconResource = '';
+        if (this._hovering)
+            iconResource = 'resource:///org/gnome/shell/theme/trash-icon-full.png';
+        else
+            iconResource = 'resource:///org/gnome/shell/theme/trash-icon-empty.png';
+
+        let gicon = new Gio.FileIcon({
+            file: Gio.File.new_for_uri(iconResource),
+        });
+
+        return new St.Icon({
+            gicon: gicon,
+            icon_size: iconSize,
+        });
+    }
+
+    _canAccept(source) {
+        return source instanceof ViewIcon;
+    }
+
+    acceptDrop(source) {
+        this._setHoveringByDnd(false);
+
+        if (!this._canAccept(source))
+            return false;
+
+        const iconGridLayout = IconGridLayout.getDefault();
+        iconGridLayout.removeIcon(source.id, true);
+        return true;
+    }
+});