Developer tile for toggling desktop mode

Create a developer tile for toggling desktop windowing mode.
Relies on desktop windowing prototype flag, captions in shell flag and
freeform to be enabled.

Bug: 241944030
Test: manually verified tile is available in developer tiles
Change-Id: I0e5904ac896405ac166590972a83872cdbabb5a4

src/com/android/settings/development/qstile/DevelopmentTiles.java

@@ -476,4 +476,77 @@ public abstract class DevelopmentTiles extends TileService {
                 Settings.System.SHOW_TOUCHES, isEnabled ? SETTING_VALUE_ON : SETTING_VALUE_OFF);
         }
     }
+
+    /**
+     * Tile to enable desktop mode
+     */
+    public static class DesktopMode extends DevelopmentTiles {
+
+        private static final int SETTING_VALUE_ON = 1;
+        private static final int SETTING_VALUE_OFF = 0;
+        private Context mContext;
+
+        @Override
+        public void onCreate() {
+            super.onCreate();
+            mContext = getApplicationContext();
+        }
+
+        @Override
+        protected boolean isEnabled() {
+            return Settings.System.getInt(mContext.getContentResolver(),
+                    Settings.System.DESKTOP_MODE, SETTING_VALUE_OFF) == SETTING_VALUE_ON;
+        }
+
+        private boolean isDesktopModeFlagEnabled() {
+            return SystemProperties.getBoolean("persist.wm.debug.desktop_mode", false);
+        }
+
+        private boolean isFreeformFlagEnabled() {
+            return Settings.Global.getInt(mContext.getContentResolver(),
+                    Settings.Global.DEVELOPMENT_ENABLE_FREEFORM_WINDOWS_SUPPORT, SETTING_VALUE_OFF)
+                    == SETTING_VALUE_ON;
+        }
+
+        private boolean isCaptionOnShellEnabled() {
+            return SystemProperties.getBoolean("persist.wm.debug.caption_on_shell", false);
+        }
+
+        @Override
+        protected void setIsEnabled(boolean isEnabled) {
+            if (isEnabled) {
+                // Check that all required features are enabled
+                if (!isDesktopModeFlagEnabled()) {
+                    closeShade();
+                    showMessage(
+                            "Enable 'Desktop Windowing Proto 1' from the Flag Flipper app");
+                    return;
+                }
+                if (!isCaptionOnShellEnabled()) {
+                    closeShade();
+                    showMessage("Enable 'Captions in Shell' from the Flag Flipper app");
+                    return;
+                }
+                if (!isFreeformFlagEnabled()) {
+                    closeShade();
+                    showMessage(
+                            "Enable freeform windows from developer settings");
+                    return;
+                }
+            }
+
+            Settings.System.putInt(mContext.getContentResolver(),
+                    Settings.System.DESKTOP_MODE,
+                    isEnabled ? SETTING_VALUE_ON : SETTING_VALUE_OFF);
+            closeShade();
+        }
+
+        private void closeShade() {
+            sendBroadcast(new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));
+        }
+
+        private void showMessage(String message) {
+            Toast.makeText(mContext, message, Toast.LENGTH_LONG).show();
+        }
+    }
 }