How to change the font color of a MenuBar?

问题

How can I change the text color of the menu items of a QML MenuBar?

import QtQuick 2.4
import QtQuick.Controls 1.3
import QtQuick.Window 2.2
import QtQuick.Dialogs 1.2
import QtQuick.Controls.Styles 1.3 as QtQuickControlStyle

ApplicationWindow {
    title: qsTr("Test")
    width: 640
    height: 480
    visible: true

    property color menuBackgroundColor: "#3C3C3C"
    property color menuBorderColor: "#282828"

    menuBar: MenuBar {

        style: QtQuickControlStyle.MenuBarStyle {
            padding {
                left: 8
                right: 8
                top: 3
                bottom: 3
            } 
            background: Rectangle {
                border.color: menuBorderColor
                color: menuBackgroundColor
            }
            // font: // how to set font color to red?
            // textColor: "red" /* does not work - results in Cannot assign to non-existent property "textColor" */
            TextField {  // does also not work
                style: TextFieldStyle {
                    textColor: "red"
                }
            }
        }
    }
}     

A similar question has been asked here but it seems not to work with menu items.

回答1:

You have to redefine itemDelegate and itemDelegate.label for menuStyle. The former defines the style of the MenuBar text whereas the latter defines the style of menu items text.

In the following example I defined a full style for MenuBar and Menus, not only for their text. scrollIndicator is the only missing piece here. It can be represented as a Text/Label or an Image.

import QtQuick 2.4
import QtQuick.Controls 1.3
import QtQuick.Controls.Styles 1.3
import QtQuick.Window 2.2

ApplicationWindow {
    title: qsTr("Test")
    width: 640
    height: 480
    visible: true

    property color menuBackgroundColor: "#3C3C3C"
    property color menuBorderColor: "#282828"

    menuBar: MenuBar {

        Menu {
            title: "File"
            MenuItem { text: "Open..." }
            MenuItem { text: "Close" }
        }

        Menu {
            title: "Edit"
            MenuItem { text: "Cut"; checkable: true}
            MenuItem { text: "Copy" }
            MenuItem { text: "Paste" }
            MenuSeparator {visible: true }
            Menu {
                title: "submenu"
            }
        }

        style: MenuBarStyle {

            padding {
                left: 8
                right: 8
                top: 3
                bottom: 3
            }

            background: Rectangle {
                id: rect
                border.color: menuBorderColor
                color: menuBackgroundColor
            }

            itemDelegate: Rectangle {            // the menus
                implicitWidth: lab.contentWidth * 1.4           // adjust width the way you prefer it
                implicitHeight: lab.contentHeight               // adjust height the way you prefer it
                color: styleData.selected || styleData.open ? "red" : "transparent"
                Label {
                    id: lab
                    anchors.horizontalCenter: parent.horizontalCenter
                    color: styleData.selected  || styleData.open ? "white" : "red"
                    font.wordSpacing: 10
                    text: styleData.text
                }
            }

            menuStyle: MenuStyle {               // the menus items
                id: goreStyle

                frame: Rectangle {
                    color: menuBackgroundColor
                }

                itemDelegate {
                    background: Rectangle {
                        color:  styleData.selected || styleData.open ? "red" : menuBackgroundColor
                        radius: styleData.selected ? 3 : 0
                    }

                    label: Label {
                        color: styleData.selected ? "white" : "red"
                        text: styleData.text
                    }

                    submenuIndicator: Text {
                        text: "\u25ba"
                        font: goreStyle.font
                        color: styleData.selected  || styleData.open ? "white" : "red"
                        styleColor: Qt.lighter(color, 4)
                    }

                    shortcut: Label {
                        color: styleData.selected ? "white" : "red"
                        text: styleData.shortcut
                    }

                    checkmarkIndicator: CheckBox {          // not strinctly a Checkbox. A Rectangle is fine too
                        checked: styleData.checked

                        style: CheckBoxStyle {

                            indicator: Rectangle {
                                implicitWidth: goreStyle.font.pixelSize
                                implicitHeight: implicitWidth
                                radius: 2
                                color: control.checked ?  "red" : menuBackgroundColor
                                border.color: control.activeFocus ? menuBackgroundColor : "red"
                                border.width: 2
                                Rectangle {
                                    visible: control.checked
                                    color: "red"
                                    border.color: menuBackgroundColor
                                    border.width: 2
                                    radius: 2
                                    anchors.fill: parent
                                }
                            }
                            spacing: 10
                        }
                    }
                }

                // scrollIndicator:               // <--- could be an image

                separator: Rectangle {
                    width: parent.width
                    implicitHeight: 2
                    color: "white"
                }
            }
        }
    }
}

And here is the resulting MenuBar and Menus:

You can also choose to set a MenuStyle directly inside a Menu, in the style property. Something like this:

Menu {
    title: "File"
    MenuItem { text: "Open..." }
    MenuItem { text: "Close" }

    style: MenuStyle {
        itemDelegate.label: Label {
        color: "blue"
        text: styleData.text

        // stuff above here
    }
}

In this last example only the "File" Menu items are styled with a blue color for text. One can argue how much ugly that would be, though.

来源：https://stackoverflow.com/questions/31856207/how-to-change-the-font-color-of-a-menubar