[ui] checkbox fixes

gui/components/Locations.qml

@@ -243,7 +243,7 @@ ThemedPage {
         if (bridgeWarning.visible) {
             h += bridgeWarning.height
         }
-        return h + 30
+        return h + 50
     }
 
     function getSignalFor(location) {

gui/components/MaterialCheckBox.qml

+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Controls 2 module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.12
+import QtQuick.Templates 2.12 as T
+import QtQuick.Controls.Material 2.12
+import QtQuick.Controls.Material.impl 2.12
+
+T.CheckBox {
+    id: control
+
+    implicitWidth: Math.max(implicitBackgroundWidth + leftInset + rightInset,
+                            implicitContentWidth + leftPadding + rightPadding)
+    implicitHeight: Math.max(implicitBackgroundHeight + topInset + bottomInset,
+                             implicitContentHeight + topPadding + bottomPadding,
+                             implicitIndicatorHeight + topPadding + bottomPadding)
+
+    spacing: 4
+    padding: 4
+    verticalPadding: padding + 2
+
+    indicator: CheckIndicator {
+        // XXX modified left offset to align with headers
+        x: control.text ? (control.mirrored ? control.width - width - control.rightPadding : control.leftPadding) - 4 : control.leftPadding + (control.availableWidth - width) / 2
+        y: control.topPadding + (control.availableHeight - height) / 2
+        control: control
+
+        Ripple {
+            x: (parent.width - width) / 2
+            y: (parent.height - height) / 2
+            width: 28; height: 28
+
+            z: -1
+            anchor: control
+            pressed: control.pressed
+            active: control.down || control.visualFocus || control.hovered
+            color: control.checked ? control.Material.highlightedRippleColor : control.Material.rippleColor
+        }
+    }
+
+    contentItem: Text {
+        leftPadding: control.indicator && !control.mirrored ? control.indicator.width + control.spacing : 0
+        rightPadding: control.indicator && control.mirrored ? control.indicator.width + control.spacing : 0
+
+        text: control.text
+        font: control.font
+        color: control.enabled ? control.Material.foreground : control.Material.hintTextColor
+        elide: Text.ElideRight
+        verticalAlignment: Text.AlignVCenter
+    }
+}

gui/components/Preferences.qml

@@ -70,7 +70,7 @@ ThemedPage {
                 Layout.preferredWidth: 240
             }
 
-            CheckBox {
+            MaterialCheckBox {
                 id: useBridgesCheckBox
                 checked: false
                 text: qsTr("Use obfs4 bridges")
@@ -94,7 +94,7 @@ ThemedPage {
                 }
             }
 
-            CheckBox {
+            MaterialCheckBox {
                 id: useSnowflake
                 //wrapMode: Label.Wrap
                 text: qsTr("Use Snowflake (experimental)")
@@ -122,7 +122,7 @@ ThemedPage {
                 Layout.rightMargin: 10
             }
 
-            CheckBox {
+            MaterialCheckBox {
                 id: useUDP
                 text: qsTr("UDP")
                 enabled: false

gui/gui.qrc

@@ -16,6 +16,7 @@
         <file>components/MaterialRadioButton.qml</file>
         <file>components/MaterialRadioIndicator.qml</file>
         <file>components/WrappedRadioButton.qml</file>
+        <file>components/MaterialCheckBox.qml</file>
         <file>components/StatusBox.qml</file>
         <file>components/Systray.qml</file>
         <file>components/Help.qml</file>