QS, stop WiFi scanning when WiFi disabled.

Only do periodic WiFi scanning when WiFi is enabled.

Hide scanning progress bar as soon as user disables WiFi, even if a
scan is still in progress.

BUG=891947

Change-Id: Ica6cc4116f88743b24fb081b89886501ecd1d2d3
Reviewed-on: https://chromium-review.googlesource.com/c/1356027Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Tony De Luna <tonydeluna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613175}

ash/system/network/network_state_list_detailed_view.cc

@@ -58,6 +58,11 @@ bool IsSecondaryUser() {
          !session_controller->IsUserPrimary();
 }
 
+bool IsWifiEnabled() {
+  return NetworkHandler::Get()->network_state_handler()->IsTechnologyEnabled(
+      chromeos::NetworkTypePattern::WiFi());
+}
+
 }  // namespace
 
 // A bubble which displays network info.
@@ -194,6 +199,7 @@ NetworkStateListDetailedView::~NetworkStateListDetailedView() {
 void NetworkStateListDetailedView::Update() {
   UpdateNetworkList();
   UpdateHeaderButtons();
+  UpdateScanningBar();
   Layout();
 }
 
@@ -209,8 +215,8 @@ void NetworkStateListDetailedView::Init() {
 
   Update();
 
-  if (list_type_ == LIST_TYPE_NETWORK)
-    CallRequestScan();
+  if (list_type_ == LIST_TYPE_NETWORK && IsWifiEnabled())
+    ScanAndStartTimer();
 }
 
 void NetworkStateListDetailedView::HandleButtonPressed(views::Button* sender,
@@ -298,13 +304,25 @@ void NetworkStateListDetailedView::UpdateHeaderButtons() {
           Shell::Get()->session_controller()->ShouldEnableSettings());
     }
   }
-  if (list_type_ == LIST_TYPE_NETWORK) {
-    NetworkStateHandler* network_state_handler =
-        NetworkHandler::Get()->network_state_handler();
-    const bool scanning = network_state_handler->GetScanningByType(
-        NetworkTypePattern::WiFi() | NetworkTypePattern::Tether());
-    ShowProgress(-1, scanning);
-  }
+}
+
+void NetworkStateListDetailedView::UpdateScanningBar() {
+  if (list_type_ != LIST_TYPE_NETWORK)
+    return;
+
+  bool is_wifi_enabled = IsWifiEnabled();
+  if (is_wifi_enabled && !network_scan_repeating_timer_.IsRunning())
+    ScanAndStartTimer();
+
+  if (!is_wifi_enabled && network_scan_repeating_timer_.IsRunning())
+    network_scan_repeating_timer_.Stop();
+
+  const bool scanning_bar_visible =
+      is_wifi_enabled &&
+      NetworkHandler::Get()->network_state_handler()->GetScanningByType(
+          NetworkTypePattern::WiFi() | NetworkTypePattern::Tether());
+
+  ShowProgress(-1, scanning_bar_visible);
 }
 
 void NetworkStateListDetailedView::ToggleInfoBubble() {
@@ -380,15 +398,20 @@ views::View* NetworkStateListDetailedView::CreateNetworkInfoView() {
   return label;
 }
 
+void NetworkStateListDetailedView::ScanAndStartTimer() {
+  CallRequestScan();
+  network_scan_repeating_timer_.Start(
+      FROM_HERE, base::TimeDelta::FromSeconds(kRequestScanDelaySeconds), this,
+      &NetworkStateListDetailedView::CallRequestScan);
+}
+
 void NetworkStateListDetailedView::CallRequestScan() {
+  if (!IsWifiEnabled())
+    return;
+
   VLOG(1) << "Requesting Network Scan.";
   NetworkHandler::Get()->network_state_handler()->RequestScan(
       NetworkTypePattern::WiFi() | NetworkTypePattern::Tether());
-  // Periodically request a scan while this UI is open.
-  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
-      FROM_HERE,
-      base::Bind(&NetworkStateListDetailedView::CallRequestScan, AsWeakPtr()),
-      base::TimeDelta::FromSeconds(kRequestScanDelaySeconds));
 }
 
 }  // namespace tray

ash/system/network/network_state_list_detailed_view.h

@@ -11,6 +11,7 @@
 #include "ash/system/tray/tray_detailed_view.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/timer/timer.h"
 
 namespace views {
 class Button;
@@ -62,16 +63,22 @@ class ASH_EXPORT NetworkStateListDetailedView
   // Launches the WebUI settings in a browser and closes the system menu.
   void ShowSettings();
 
-  // Update UI components.
+  // Update info and settings buttons in header.
   void UpdateHeaderButtons();
 
+  // Update scanning progress bar.
+  void UpdateScanningBar();
+
   // Create and manage the network info bubble.
   void ToggleInfoBubble();
   bool ResetInfoBubble();
   void OnInfoBubbleDestroyed();
   views::View* CreateNetworkInfoView();
 
-  // Periodically request a network scan.
+  // Scan and start timer to periodically request a network scan.
+  void ScanAndStartTimer();
+
+  // Request a network scan.
   void CallRequestScan();
 
   // Type of list (all networks or vpn)
@@ -86,6 +93,9 @@ class ASH_EXPORT NetworkStateListDetailedView
   // A small bubble for displaying network info.
   InfoBubble* info_bubble_;
 
+  // Timer for starting and stopping network scans.
+  base::RepeatingTimer network_scan_repeating_timer_;
+
   DISALLOW_COPY_AND_ASSIGN(NetworkStateListDetailedView);
 };