Added menu support to QGCButton

qgroundcontrol.qrc

@@ -253,6 +253,7 @@
         <file alias="QGroundControl/Controls/QGCCheckBox.qml">src/QmlControls/QGCCheckBox.qml</file>
         <file alias="QGroundControl/Controls/QGCLabel.qml">src/QmlControls/QGCLabel.qml</file>
         <file alias="QGroundControl/Controls/QGCTextField.qml">src/QmlControls/QGCTextField.qml</file>
+        <file alias="QGroundControl/Controls/arrow-down.png">src/QmlControls/arrow-down.png</file>
 
         <file alias="octo_x.png">files/images/px4/airframes/octo_x.png</file>
         <file alias="px4fmu_2.x.png">files/images/px4/boards/px4fmu_2.x.png</file>

src/QmlControls/QGCButton.qml

 import QtQuick 2.2
 import QtQuick.Controls 1.2
 import QtQuick.Controls.Styles 1.2
+import QtQuick.Controls.Private 1.0
 
 import QGroundControl.Palette 1.0
 
@@ -13,6 +14,7 @@ Button {
     property bool __showHighlight: pressed | hovered | checked
 
     style: ButtonStyle {
+/*
             background: Rectangle {
                 implicitWidth: 100
                 implicitHeight: 25
@@ -33,5 +35,66 @@ Button {
                     control.__qgcPal.buttonHighlightText :
                     (primary ? control.__qgcPal.primaryButtonText : control.__qgcPal.buttonText)
             }
+*/
+
+            /*! The padding between the background and the label components. */
+            padding {
+                top: 4
+                left: 4
+                right:  control.menu !== null ? Math.round(TextSingleton.implicitHeight * 0.5) : 4
+                bottom: 4
+            }
+
+            /*! This defines the background of the button. */
+            background: Item {
+                property bool down: control.pressed || (control.checkable && control.checked)
+                implicitWidth: Math.round(TextSingleton.implicitHeight * 4.5)
+                implicitHeight: Math.max(25, Math.round(TextSingleton.implicitHeight * 1.2))
+
+                Rectangle {
+                    anchors.fill: parent
+                    color: __showHighlight ?
+                        control.__qgcPal.buttonHighlight :
+                        (primary ? control.__qgcPal.primaryButton : control.__qgcPal.button)
+                }
+
+                Image {
+                    id: imageItem
+                    visible: control.menu !== null
+                    source: "arrow-down.png"
+                    anchors.verticalCenter: parent.verticalCenter
+                    anchors.right: parent.right
+                    anchors.rightMargin: padding.right
+                    opacity: control.enabled ? 0.6 : 0.5
+                }
+            }
+
+            /*! This defines the label of the button.  */
+            label: Item {
+                implicitWidth: row.implicitWidth
+                implicitHeight: row.implicitHeight
+                baselineOffset: row.y + text.y + text.baselineOffset
+
+                Row {
+                    id: row
+                    anchors.centerIn: parent
+                    spacing: 2
+
+                    Image {
+                        source: control.iconSource
+                        anchors.verticalCenter: parent.verticalCenter
+                    }
+
+                    Text {
+                        id: text
+                        renderType: Text.NativeRendering
+                        anchors.verticalCenter: parent.verticalCenter
+                        text: control.text
+                        color: __showHighlight ?
+                            control.__qgcPal.buttonHighlightText :
+                            (primary ? control.__qgcPal.primaryButtonText : control.__qgcPal.buttonText)
+                    }
+                }
+            }
         }
 }

src/QmlControls/QmlTest.qml

@@ -367,6 +367,37 @@ Rectangle {
                     enabled: false
                 }
 
+                // QGCButton - menu
+                Loader {
+                    sourceComponent: ctlRowHeader
+                    property var text: "QGCButton(menu)"
+                }
+                Menu {
+                    id: buttonMenu
+                    MenuItem {
+                        text: "Item 1"
+                    }
+                    MenuItem {
+                        text: "Item 2"
+                    }
+                    MenuItem {
+                        text: "Item 3"
+                    }
+                }
+                QGCButton {
+                    width: 100
+                    height: 20
+                    text: "Button"
+                    menu: buttonMenu
+                }
+                QGCButton {
+                    width: 100
+                    height: 20
+                    text: "Button"
+                    enabled: false
+                    menu: buttonMenu
+                }
+
                 // QGCRadioButton
                 Loader {
                     sourceComponent: ctlRowHeader