Text {
id: label
x: 24; y: 24
// custom counter property for space presses
property int spacePresses: 0
text: "Space pressed: " + spacePresses + " times"
// (1) handler for text changes
onTextChanged: console.log("text changed to:", text)
// need focus to receive key events
focus: true
// (2) handler with some JS
Keys.onSpacePressed: {
increment()
}
// clear the text on escape
Keys.onEscapePressed: {
label.text = ''
}
// (3) a JS function
..

随手一翻，翻到一篇简易教程，用于安全使用QFlags


http://qt-project.org/wiki/QFlags_tutorial

Simple tutorial for safe-usage QFlags



Overview


First of all we should write about macro Q_FLAGSThis macro registers one or several flags types to the meta-object system

Example:




class TestClass
{
public:
enum Option {
OptionA = 0x0, // 0x000000
OptionB = 0x1, // 0x000001
OptionC = 0x2, // 0x000010
OptionD = 0x4, // 0x000100
OptionE = 0x8, // 0x001000
OptionF = 0x16 // 0x010000
..