Add option to show taskbar when Flow Launcher is opend (Flow-Launcher#4177)

* Add option to show taskbar when Flow Launcher is invoked

Co-authored-by: VictoriousRaptor <[email protected]>

* Fix: Use ABM_ACTIVATE instead of ABM_SETSTATE for temporary taskbar showing

Co-authored-by: VictoriousRaptor <[email protected]>

* Remove unnecessary unsafe keyword from ShowTaskbar method

Co-authored-by: VictoriousRaptor <[email protected]>

* Fix missing closing braces in Win32Helper.cs

Co-authored-by: VictoriousRaptor <[email protected]>

* Change wording from 'invoked' to 'opened' in localization strings

Co-authored-by: VictoriousRaptor <[email protected]>

* Show/hide tasking when showing/hiding Flow

* Remove unused APPBARDATA

* Guard HideTaskbar() with state so show/hide stay balanced

* Improve taskbar visibility management in MainViewModel

Moved taskbar show logic to after keyboard layout switch in Show().Ensures consistent taskbar state when invoking or hiding the app.

* Clean code

* Clean code

* Remove blank line

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: Jack Ye <[email protected]>
Co-authored-by: Jack251970 <[email protected]>

Author: 3 people

Flow.Launcher.Infrastructure/NativeMethods.txt

@@ -52,4 +52,7 @@ CoTaskMemFree
 
 IShellLinkW
 SLR_FLAGS
-WIN32_FIND_DATAW
+WIN32_FIND_DATAW
+
+MonitorFromWindow
+PostMessage

Flow.Launcher.Infrastructure/UserSettings/Settings.cs

@@ -202,6 +202,7 @@ public bool KeepMaxResults
 
         public bool HideOnStartup { get; set; } = true;
         public bool HideWhenDeactivated { get; set; } = true;
+        public bool ShowTaskbarWhenInvoked { get; set; } = false;
 
         private bool _showAtTopmost = false;
         public bool ShowAtTopmost

Flow.Launcher.Infrastructure/Win32Helper.cs

@@ -416,5 +416,32 @@ public static string SelectFile()
         }
 
         #endregion
+
+        #region Taskbar
+
+        public static unsafe void ShowTaskbar()
+        {
+            // Find the taskbar window
+            var taskbarHwnd = PInvoke.FindWindowEx(HWND.Null, HWND.Null, "Shell_TrayWnd", null);
+            if (taskbarHwnd == HWND.Null) return;
+
+            // Magic from https://github.com/Oliviaophia/SmartTaskbar
+            const uint TrayBarFlag = 0x05D1;
+            var mon = PInvoke.MonitorFromWindow(taskbarHwnd, Windows.Win32.Graphics.Gdi.MONITOR_FROM_FLAGS.MONITOR_DEFAULTTONEAREST);
+            PInvoke.PostMessage(taskbarHwnd, TrayBarFlag, new WPARAM(1), new LPARAM((nint)mon.Value));
+        }
+
+        public static void HideTaskbar()
+        {
+            // Find the taskbar window
+            var taskbarHwnd = PInvoke.FindWindowEx(HWND.Null, HWND.Null, "Shell_TrayWnd", null);
+            if (taskbarHwnd == HWND.Null) return;
+
+            // Magic from https://github.com/Oliviaophia/SmartTaskbar
+            const uint TrayBarFlag = 0x05D1;
+            PInvoke.PostMessage(taskbarHwnd, TrayBarFlag, new WPARAM(0), IntPtr.Zero);
+        }
+
+        #endregion
     }
 }

Flow.Launcher/Languages/en.xaml

@@ -35,6 +35,8 @@
     <system:String x:Key="flowlauncher_settings">Settings</system:String>
     <system:String x:Key="general">General</system:String>
     <system:String x:Key="hideFlowLauncherWhenLoseFocus">Hide Flow Launcher when focus is lost</system:String>
+    <system:String x:Key="showTaskbarWhenOpened">Show taskbar when Flow Launcher is opened</system:String>
+    <system:String x:Key="showTaskbarWhenOpenedToolTip">Temporarily show the taskbar when Flow Launcher is opened, useful for auto-hidden taskbars.</system:String>
     <system:String x:Key="SearchWindowPosition">Search Window Location</system:String>
     <system:String x:Key="SearchWindowScreenRememberLastLaunchLocation">Remember Last Position</system:String>
     <system:String x:Key="SearchWindowScreenCursor">Monitor with Mouse Cursor</system:String>

Flow.Launcher/SettingPages/Views/SettingsPaneGeneral.xaml

@@ -49,6 +49,16 @@
                     OnContent="{DynamicResource enable}" />
             </ui:SettingsCard>
 
+            <ui:SettingsCard
+                Margin="0 4 0 0"
+                Description="{DynamicResource showTaskbarWhenOpenedToolTip}"
+                Header="{DynamicResource showTaskbarWhenOpened}">
+                <ui:ToggleSwitch
+                    IsOn="{Binding Settings.ShowTaskbarWhenInvoked}"
+                    OffContent="{DynamicResource disable}"
+                    OnContent="{DynamicResource enable}" />
+            </ui:SettingsCard>
+
             <ui:SettingsCard
                 Margin="0 14 0 0"
                 Description="{DynamicResource showAtTopmostToolTip}"

Flow.Launcher/ViewModel/MainViewModel.cs

@@ -49,6 +49,7 @@ public partial class MainViewModel : BaseModel, ISavable, IDisposable
         private readonly ResultsViewModel _results, _contextMenu;
         private readonly IReadOnlyList<Result> _emptyResult = [];
 
+        private bool _taskbarShownByFlow = false;
         #endregion
 
         #region Constructor
@@ -1429,6 +1430,13 @@ public void Show()
             MainWindowVisibility = Visibility.Visible;
             MainWindowVisibilityStatus = true;
             VisibilityChanged?.Invoke(this, new VisibilityChangedEventArgs { IsVisible = true });
+
+            // Show the taskbar if the setting is enabled
+            if (Settings.ShowTaskbarWhenInvoked && !_taskbarShownByFlow)
+            {
+                Win32Helper.ShowTaskbar();
+                _taskbarShownByFlow = true;
+            }
         }
 
         public async void Hide()
@@ -1473,6 +1481,13 @@ public async void Hide()
                 }
             }, DispatcherPriority.Render);
 
+            // Hide the taskbar if the setting is enabled
+            if (_taskbarShownByFlow)
+            {
+                Win32Helper.HideTaskbar();
+                _taskbarShownByFlow = false;
+            }
+
             // Update WPF properties
             MainWindowVisibilityStatus = false;
             MainWindowVisibility = Visibility.Collapsed;