window: add support for startSystemMove, resize, maximize to floating

windows

quickshell/Modals/FileBrowser/FileBrowserContent.qml

@@ -47,6 +47,7 @@ FocusScope {
     property int actualGridColumns: 5
     property bool _initialized: false
     property bool closeOnEscape: true
+    property var windowControls: null
 
     signal fileSelected(string path)
     signal closeRequested
@@ -155,7 +156,6 @@ FocusScope {
         const lastSlash = path.lastIndexOf('/');
         if (lastSlash <= 0)
             return;
-
         const newPath = path.substring(0, lastSlash);
         if (newPath.length < homeDir.length) {
             currentPath = homeDir;
@@ -534,6 +534,14 @@ FocusScope {
             width: parent.width
             height: 48
 
+            MouseArea {
+                anchors.fill: parent
+                onPressed: if (windowControls)
+                    windowControls.tryStartMove()
+                onDoubleClicked: if (windowControls)
+                    windowControls.tryToggleMaximize()
+            }
+
             Row {
                 spacing: Theme.spacingM
                 anchors.verticalCenter: parent.verticalCenter
@@ -595,6 +603,16 @@ FocusScope {
                     onClicked: root.showKeyboardHints = !root.showKeyboardHints
                 }
 
+                DankActionButton {
+                    visible: windowControls?.supported ?? false
+                    circular: false
+                    iconName: windowControls?.targetWindow?.maximized ? "fullscreen_exit" : "fullscreen"
+                    iconSize: Theme.iconSize - 4
+                    iconColor: Theme.surfaceText
+                    onClicked: if (windowControls)
+                        windowControls.tryToggleMaximize()
+                }
+
                 DankActionButton {
                     circular: false
                     iconName: "close"

quickshell/Modals/FileBrowser/FileBrowserModal.qml

@@ -1,6 +1,7 @@
 import QtQuick
 import Quickshell
 import qs.Common
+import qs.Widgets
 
 FloatingWindow {
     id: fileBrowserModal
@@ -60,6 +61,7 @@ FloatingWindow {
         anchors.fill: parent
         focus: true
         closeOnEscape: false
+        windowControls: windowControls
 
         browserTitle: fileBrowserModal.browserTitle
         browserIcon: fileBrowserModal.browserIcon
@@ -74,4 +76,9 @@ FloatingWindow {
         onFileSelected: path => fileBrowserModal.fileSelected(path)
         onCloseRequested: fileBrowserModal.close()
     }
+
+    FloatingWindowControls {
+        id: windowControls
+        targetWindow: fileBrowserModal
+    }
 }