Obsolete Members for PieMenu

The following members of QML type PieMenu 已过时。 提供它们是为使旧源代码能继续工作。强烈建议不要在新代码中使用它们。

特性

• boundingItem : Item
• currentIndex : int
• currentItem : int
• menuItems : list<MenuItem>
• selectionAngle : real
• title : string
• triggerMode : int

特性文档编制

boundingItem : Item

The item which the menu must stay within.

A typical use case for PieMenu involves:

• A MouseArea that determines the clickable area within which the menu can be opened.
• The bounds that the menu must not go outside of.

Although they sound similar, they have different purposes. Consider the example below:

The user can only open the menu within the inner rectangle. In this case, they've opened the menu on the edge of the MouseArea , but there would not be enough room to display the entire menu centered at the cursor position, so it was moved to the left.

If for some reason we didn't want this restriction, we can set boundingItem to null :

By default, the menu's parent is the boundingItem.

[read-only] currentIndex : int

The index of the the menu item that is currently under the mouse, or -1 if there is no such item.

[read-only] currentItem : int

The menu item that is currently under the mouse, or null if there is no such item.

[default] menuItems : list < MenuItem >

The list of menu items displayed by this menu.

You can assign menu items by declaring them as children of PieMenu :

PieMenu {
    MenuItem {
        text: "Action 1"
        onTriggered: function() { print("Action 1"); }
    }
    MenuItem {
        text: "Action 2"
        onTriggered: function() { print("Action 2"); }
    }
    MenuItem {
        text: "Action 3"
        onTriggered: function() { print("Action 3"); }
    }
}
									

[read-only] selectionAngle : real

This property reflects the angle (in radians) created by the imaginary line from the center of the menu to the position of the cursor.

Its value is undefined when the menu is not visible.

title : string

This property defines the text that is shown above the menu when there is no current menu item ( currentIndex is -1 ).

默认值为 "" (an empty string).

triggerMode : int

This property determines the method for selecting items in the menu.

• A triggerMode of TriggerMode.TriggerOnPress means that menu items will only be selected when a mouse press event occurs over them.
• A triggerMode of TriggerMode.TriggerOnRelease means that menu items will only be selected when a mouse release event occurs over them. This means that the user must keep the mouse button down after opening the menu and release the mouse over the item they wish to select.
• A triggerMode of TriggerMode.TriggerOnClick means that menu items will only be selected when the user clicks once over them.

警告： Changing the triggerMode while the menu is visible will result in undefined behavior.