A popup menu that displays several menu items along an arc. 更多...
| import 语句： | import QtQuick.Extras 1.4 |
| Since: | Qt 5.5 |
The PieMenu provides a radial context menu as an alternative to a traditional menu. All of the items in a PieMenu are an equal distance from the center of the control.
To create a menu, define at least one MenuItem as a child of it:
PieMenu {
id: pieMenu
MenuItem {
text: "Action 1"
onTriggered: print("Action 1")
}
MenuItem {
text: "Action 2"
onTriggered: print("Action 2")
}
MenuItem {
text: "Action 3"
onTriggered: print("Action 3")
}
}
By default, only the currently selected item's text is displayed above the menu. To provide text that is always visible when there is no current item, set the title 特性。
The typical use case for a menu is to open at the point of the mouse cursor after a right click occurs. To do that, define a MouseArea that covers the region upon which clicks should open the menu. When the MouseArea is right-clicked, call the popup() 函数：
MouseArea {
anchors.fill: parent
acceptedButtons: Qt.RightButton
onClicked: pieMenu.popup(mouseX, mouseY)
}
If the menu is opened in a position where some of its menu items would be outside of
boundingItem
, it is automatically moved to a position where they will not be hidden. By default, the
boundingItem
is set to the parent of the menu. It can also be set to
null
to prevent this behavior.
PieMenu can be displayed at any position on the screen. With a traditional context menu, the menu would be positioned with its top left corner at the position of the right click, but since PieMenu is radial, we position it centered over the position of the right click.
要创建 PieMenu that opens after a long press and selects items upon releasing, you can combine ActivationMode.ActivateOnRelease with a MouseArea using a Timer:
MouseArea {
id: touchArea
anchors.fill: parent
Timer {
id: pressAndHoldTimer
interval: 300
onTriggered: pieMenu.popup(touchArea.mouseX, touchArea.mouseY);
}
onPressed: pressAndHoldTimer.start()
onReleased: pressAndHoldTimer.stop();
}
PieMenu {
id: pieMenu
triggerMode: TriggerMode.TriggerOnRelease
MenuItem {
text: "Action 1"
onTriggered: print("Action 1")
}
MenuItem {
text: "Action 2"
onTriggered: print("Action 2")
}
MenuItem {
text: "Action 3"
onTriggered: print("Action 3")
}
}
You can hide individual menu items by setting their visible property to
false
. Hiding items does not affect the
startAngle
or
endAngle
; the remaining items will grow to consume the available space.
You can create a custom appearance for a PieMenu by assigning a PieMenuStyle
|
boundingItem : Item |
The item which the menu must stay within.
A typical use case for PieMenu involves:
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.
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.
警告： Changing the triggerMode while the menu is visible will result in undefined behavior.
|
void addItem ( string text ) |
Adds an item to the end of the menu items.
Equivalent to passing calling
insertItem(menuItems.length, text)
.
Returns the newly added item.
插入 MenuItem with text before the index at before .
To insert an item at the end, pass
menuItems.length
.
Returns the newly inserted item, or
null
if
before
无效。
Opens the menu at coordinates x , y .
移除 item from the menu.