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  • qml focus相关

    Item的属性:

    read-only activeFocus : bool
    This property indicates whether the item has active focus.
    An item with active focus will receive keyboard input, or is a FocusScope ancestor of the item that will receive keyboard input.
    Usually, activeFocus is gained by setting focus on an item and its enclosing FocusScopes.(两个都要focus) In the following example input will have activeFocus.


    Rectangle {
         FocusScope {
             focus: true
             TextInput {
                 id: input
                 focus: true
             }
         }
    }

    focus : bool
    This property indicates whether the item has focus within the enclosing focus scope. If true, this item will gain active focus when the enclosing focus scope gains active focus. (当包围的focus scope得到active focus时候, 它也会得到 active focus)In the following example, input will be given active focus when scope gains active focus.
    Rectangle {
         FocusScope {
             id: scope
             TextInput {
                 id: input
                 focus: true
             }
         }
    }
    For the purposes of this property, the scene as a whole is assumed to act like a focus scope. On a practical level, that means the following QML will give active focus to input on startup.
    Rectangle {
         TextInput {
             id: input
             focus: true
         }
    }
    See also activeFocus and Keyboard Focus.

    Keyboard Focus in QML

    This problem is fundamentally one of visibility。这个问题是由于可见性引起的。

    /////////////////////////////////////////////////////////////////////////////////////

    例子:

    import Qt 4.7

    //example from:
    //http://developer.qt.nokia.com/doc/qt-4.7/qml-focusscope.html
    /*
        Blue border indicates scoped focus
        Black border indicates NOT scoped focus
        Red box indicates active focus
        Use arrow keys to navigate
    */
    Rectangle {
        color: "white"
        480
        height: 480

        FocusScope {
            id: myScope
            focus: true

            Rectangle {
                height: 120
                420

                color: "transparent"
                border. 5
                border.color: myScope.activeFocus?"blue":"black"

                Rectangle {
                    id: item1
                    x: 10; y: 10
                    100; height: 100; color: "green"
                    border. 5
                    border.color: activeFocus?"blue":"black"
                    KeyNavigation.right: item2
                    focus: true

                    Rectangle {
                        50; height: 50; anchors.centerIn: parent
                        color: parent.focus?"red":"transparent"
                    }
                }

                Rectangle {
                    id: item2
                    x: 310; y: 10
                    100; height: 100; color: "green"
                    border. 5
                    border.color: activeFocus?"blue":"black"
                    KeyNavigation.left: item1
                    Keys.onDigit9Pressed: console.log("Top Right");

                    Rectangle {
                        50; height: 50; anchors.centerIn: parent
                        color: parent.focus?"red":"transparent"
                    }
                }
            }
            KeyNavigation.down: item3
        }

        Rectangle {
            id: item3
            x: 10; y: 300
            100; height: 100; color: "green"
            border. 5
            border.color: activeFocus?"blue":"black"

            KeyNavigation.up: myScope

            Rectangle {
                50; height: 50; anchors.centerIn: parent
                color: parent.focus?"red":"transparent"
            }
        }

    }
    //总结:activeFocus 才是真正的焦点
    //focus只是说明当前component的哪个将要获取焦点

    activeFocus是read-only的,所以要设置焦点要用focus。

    http://developer.qt.nokia.com/forums/viewthread/3261

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  • 原文地址:https://www.cnblogs.com/cute/p/2128368.html
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